*****TBD*****

This subclass is indented under the class definition. Processes.

(1) Note. All patents containing method claims drawn to the method of operation of any of the systems or parts thereof involved in the class are included in this and the indented subclasses, but methods of making parts of the system are not included. They will be found in the subclass providing for the system or part.

(2) Note. This subclass includes, for example, methods of operation of speed regulators for prime movers, valves, fluid motors; methods of developing fluid pressures by series parallel combinations of pumps, tanks or pipes; methods for affecting fluid flow by using pipe sections of varying diameter or joined at critical angles, or by slugging.

SEE OR SEARCH CLASS:

166,	Wells, subclasses 244.1+ for process of flowing or treating a well; and particularly subclasses 373+ for a method of operating a valve, closure, or changeable restrictor in a well wherein some significant manipulative step regarding the well is recited.
210,	Liquid Purification or Separation, subclasses 606 , 631, 632, 639, 663+, 696+, 702+, and 749+ for a process comprising the step of adding a chemical to a liquid with treatment of the liquid.
222,	Dispensing, subclass 1 for processes of dispensing.
399,	Electrophotography, subclasses 237+ for liquid developer applied to a latent image within an electrophotographic device.
414,	Material or Article Handling, subclasses 800+ for a process of material or article handling.

343	WITH CASING, SUPPORT, PROTECTOR OR STATIC CONSTRUCTIONAL INSTALLATIONS:

This subclass is indented under the class definition. Apparatus comprising (1) fluid handling devices combined with means for supporting the device or a part thereof relative to means external to the device; (2) the combination of such devices or parts thereof with an enclosing member, fixture, or attachment to (a) protect the device or part thereof from soil, contamination, injury, theft or loss; or (b) protect persons or things from injury through contact with the system or a part thereof.

(1) Note. This subclass does not include supports or connectors between parts of the same fluent material system. The combination of such supports with elements of the system may be found in the subclass involving the pertinent elements of the fluid distributing system.

SEE OR SEARCH THIS CLASS, SUBCLASS:

342,	for systems having supporting means for material or things external to the system, including workmen"s supports.

SEE OR SEARCH CLASS:

73,	Measuring and Testing, subclass 201 for meter boxes.
222,	Dispensing, subclasses 102 , 131, 142.2, 142.3, 144, 160+, and 173+ for dispensers having casings and/or external supports, and see the notes to subclass 173.
239,	Fluid Sprinkling, Spraying, and Diffusing, subclasses 130+ and 146+ for spray apparatus having mobile supply and discharge, subclasses 722+ for sprayers having ambulant discharge and stationary supply, subclasses 200+, 225.1+ and 273+ for devices having nonambulant supply and discharge, subclass 168 for fluid sprinklers having hose holders and a fluid supply, and subclasses 288+ for guards and/or protectors for the apparatus or for the operator.
248,	Supports, subclasses 49+ for pipe and cable supports, 75+ for hose and nozzle supports, 102+ for nursing bottle supports, 108+ for past tube supports, 128+ for movable receptacle supports and 146+ for supports for stationary receptacles.
251,	Valves and Valve Actuation, subclasses 143+ for the mounting of valves on other parts of a fluid handling device.
285,	Pipe Joints or Couplings, subclasses 19 , 131.1 and 136.1+ for pipe and plate or box couplings, 149.1+ for pipe and box couplings, and 189+ for pipe and plate couplings.

This subclass is indented under subclass 343. Apparatus in which the casing, support, or protector is a vehicle or a part thereof, which vehicle or part thereof supports and enables movement of the fluid-handling device or part thereof relative to means external to the fluid-handling device or part thereof.

(1) Note. The term "vehicle" includes water, rail, and airborne carriers as well as land vehicles.

(2) Note. In regard to the line between Class 137 and Class 239 (as specified in the class definition of Class 239, Lines With Other Classes, Miscellaneous Class notes and Lines, Slow Diffusers), the placement of documents within Class 137, these subclasses (899+) and Class 239, subclasses 726+, represents ]an exception to the specified class line. This exception to the line between Classes 137 and 239 relates "only " to the placement of documents between subclasses 899+ of Class 137 and subclasses 726+ of Class 239. Specifically, any document which discloses a portable, overhead type of irrigating or other sprinkling apparatus, which is supported upon vehicular means, which has some form of sprinkler or other spray outlet means secured thereto for sprinkling or spraying fluid onto a surface supporting the apparatus, and which claims subject matter encompassed by the definitions of Class 239, subclasses 726+, has been placed in the appropriate subclass of Class 239, subclasses 726+, regardless of whether or not a sprinkler or other spray outlet means was specified in the claims.

SEE OR SEARCH THIS CLASS, SUBCLASS:

38+,	for movable systems controlled by the position or inertia of the system, especially subclass 43 for tanks having means for closing vents if the tank overturns.
125,	for tank truck mounted plural siphons.
223+,	for tire filling chucks or stems.
267,	for tank truck mounted plural tanks.
580,	for transfer of fluid to a moving receiver by means of a running joint.

SEE OR SEARCH CLASS:

15,	Brushing, Scrubbing, and General Cleaning, subclass 313 for vacuum cleaners installed in vehicles.
114,	Ships, subclass 74 for tankers; and subclasses 232+ for oil distributors for ships.
180,	Motor Vehicles, appropriate subclasses, especially subclasses 54.1+ for power plants.
222,	Dispensing, subclasses 608+ for ambulant dispensers, and see the search notes to subclass 608.
239,	Fluid Sprinkling, Spraying, and Diffusing, subclasses 726+ for portable, overhead-type of irrigating apparatus supported upon vehicular means, and see the search notes to subclasses 726+, and see (2) Note above.
244,	Aeronautics and Astronautics, subclass 136 for material discharging and diffusing from aircraft.
280,	Land Vehicles, appropriate subclasses, especially subclasses 830+ for tanks or boilers associated with land vehicles.
291,	Track Sanders, subclasses 3+ for fluid delivery in track sanders.

345	.. Locomotive:

This subclass is indented under subclass 899. Apparatus in which the casing, support or protector is a locomotive or a part thereof.

SEE OR SEARCH THIS CLASS, SUBCLASS:

156+,

for gas pressure discharge of liquid feed-traps to boilers.

SEE OR SEARCH CLASS:

105,	Railway Rolling Stock, subclasses 26+ for locomotives, especially subclasses 37+ for steam locomotives.
239,	Fluid Sprinkling, Spraying, and Diffusing, subclasses 173 and 174 for sprayers attached to track guided cars and locomotive cabs.
291,	Track Sanders, subclasses 3+ for fluid delivery in track sanders.
454,	Ventilation, subclasses 84+ for locomotive cab ventilation.

346	... Boiler or steam dome:

	This subclass is indented under subclass 345. Apparatus in which the casing or protector is the boiler or steam dome of a locomotive.

347	.. Railway car:

This subclass is indented under subclass 899. Apparatus in which the casing support or protector is a railroad car or a part thereof.

SEE OR SEARCH CLASS:

62,	Refrigeration, appropriate subclasses, particularly subclasses 239+ for a refrigerated vehicle.
105,	Railway Rolling Stock, subclasses 238.1+ for a special railway car body, especially subclasses 358+ for tank cars.
213,	Railway Draft Appliances, subclass 76 for the combination of a car coupling and a train line (fluid conduit) coupling.
454,	Ventilation, subclasses 83+ for ventilation of railway cars.

348	... Car frame:

This subclass is indented under subclass 347. Apparatus in which the supports, casing or protector is the car frame or a part thereof.

SEE OR SEARCH CLASS:

105,	Railway Rolling Stock, subclasses 396+ for car framing.

349	... End of car:

	This subclass is indented under subclass 347. Apparatus in which the support casing or protector is the end or end wall of car.

350	... Roof, wall or floor:

This subclass is indented under subclass 347. Apparatus in which the support, casing or protector is the roof, wall or floor of a railroad car.

SEE OR SEARCH THIS CLASS, SUBCLASS:

247.11+,	especially subclasses 247.33, 247.35, 247.37, and 247.39 for liquid sealed refrigeration car drain installations.
354,	for fluid handling devices installed in the floor of a vehicle.
360+,	and 362, for fluid handling devices installed in the wall or floor of a building.

351	.. Automotive:

This subclass is indented under subclass 899. Apparatus in which the casing, support or protector is a self propelled land vehicle that contains within itself means of motion and direction control.

SEE OR SEARCH THIS CLASS, SUBCLASS:

38+,	for fluent material handling devices controlled by the position or inertia of the system, especially subclass 43 for safety oventurn valves.
47+,	for speed responsive valve control.
345+,	and 347+, for fluid handling means installed in railway rolling stock.
479+,	for combustion engine type valves responsive to suction in the intake system.
598,	for hill holders in fluid pressure braking systems.

SEE OR SEARCH CLASS:

105,	Railway Rolling Stock, subclasses 239+ for dump type car bodies and subclasses 358+ for tank cars.
114,	Ships, subclass 74 for tankers and subclasses 232+ for oil distributors for ships.
222,	Dispensers, subclasses 608+ for ambulant dispensers, and see the search notes to subclass 608.
239,	Fluid Sprinkling, Spraying, and Diffusing, subclasses 130+ and 146 for sprayers having ambulant supply and discharge, and subclasses 722+ for spraying devices having ambulant discharge and stationary supply.
244,	Aeronautics and Astronautics, subclass 136 for material discharging and diffusing from aircraft.
258,	Railway Mail Delivery, appropriate subclasses, especially subclasses 1.2+ for refueling aircraft in flight.
280,	Land Vehicles, subclasses 830+ for tank type land vehicles.
291,	Track Sanders, appropriate subclasses, especially subclasses 3+ for the fluid delivery type.

352	... Steering post or wheel:

This subclass is indented under subclass 351. Apparatus in which a fluid control means or fluid delivery device is mounted on or associated with the steering post or steering wheel of the vehicle.

SEE OR SEARCH CLASS:

74,	Machine Element or Mechanism, subclasses 491+ for hand controlled lever and linkage systems, and 552+ for hand wheels.
180,	Motor Vehicles, subclass 78 for a motor vehicle having a controlling device which is mounted on the steering post or handle.

This subclass is indented under subclass 351. Apparatus in which the fluid handling device is mounted on or associated with the dashboard of automobile.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclasses 289 and 295 for valves provided with actuating means operable from stations more or less remote from the valve, and see the search notes to these subclasses.

354	... Floor or frame:

This subclass is indented under subclass 351. Apparatus in which the fluid handling device is mounted on or associated with the floor or frame of the vehicle.

SEE OR SEARCH THIS CLASS, SUBCLASS:

348,	and 350, for fluid handling devices associated with the frame or floor of a railway car.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclass 295 for pedal operated valve devices, and see the search notes thereto.

355	... Fender or running board:

This subclass is indented under subclass 351. Apparatus in which the fluid handling device is mounted on or associated with the fender or running board of the vehicle.

SEE OR SEARCH CLASS:

224,	Package and Article Carriers, subclasses 42.32+ for vehicle fender attached package and article carriers.
251,	Valves and Valve Actuation, subclasses 289 and 295 for valves provided with actuators having extensions or remote or plural terminals which might extend from a valve mounted on a vehicle to a fender or running board, and see the search notes to these subclasses.

355.12

.. With hose reel storage means:

This subclass is indented under subclass 899. Apparatus having a revolvable means for storing a flexible flow line mounted on the vehicle or on a part thereof.

SEE OR SEARCH CLASS:

239,	Fluid Sprinkling, Spraying, and Diffusing, subclass 199 for ambulant reel and ground supported frame for flexible flow line storage including nozzle detail.

899.1

.. Guided by means of track or guideway:

	This subclass is indented under subclass 899. Apparatus including rail means, guide wire means, or some other predetermined and established pathway which constrains the vehicle or a part thereof to be bodily movable along the rail means, guide wire means, or other pathway.

899.2

.. Aerial or water-supported (e.g., airplane or ship, etc.):

This subclass is indented under subclass 899. Apparatus in which the casing, support, or protector is either (a) an aerial vehicle or part thereof, which aerial vehicle is freely movable through the air, or (b) a buoyant vehicle or a part thereof, which buoyant vehicle is buoyantly supported by a body of water.

(1) Note. The buoyant vehicle may be submerged within the body of water during use of the fluid-handling device attached thereto or supported thereon, but must be also capable of being buoyantly supported by a body of water.

899.3

.. With retractable or nonuse-positionable support wheel:

This subclass is indented under subclass 899. Apparatus in which the vehicle or a part thereof comprises a wheel which is positionable between an in-use supporting position and a storage position, so that (a) in the in-use position, the wheel supports and enables movement of the fluid-handling device or part thereof relative to the means external to the device, and (b) in the storage position, the wheel no longer supports or enables movement of the fluid-handling device or part thereof relative to the means external to the device.

899.4

.. Vehicle supports fluid compressor and compressed fluid storage tank:

This subclass is indented under subclass 899. Apparatus in which the fluid-handling device or a part thereof comprises (a) a compressing means to induct and to compress an ambient, compressible fluid, such that the resulting compressed fluid is at a greater pressure than the ambient, uncompressed fluid, and (b) a tank or receiver means, adapted to be fluidly connected to the compressing means, to receive and store the compressed fluid under a higher-than-ambient pressure; and wherein both the compressing means and the tank or receiver means are supported as a whole by and movable as a whole by means of the vehicle or part thereof.

(1) Note. These fluid-handling devices are generally ambulant air compressor units mounted upon wheeled trucks.

355.16

. With hose storage or retrieval means:

This subclass is indented under subclass 343. Apparatus comprising a storage type, use and nonuse holding and supporting means, and/or rewind or retracting means for a flexible conduit combined with some element or elements of the fluid supply means.

(1) Note. Included herein are hose brackets adapted to be released by distension or inflation of the hose under pressure of fluid contents.

(2) Note. See Class 239, Fluid Sprinkling, Spraying, and Diffusing, Miscellaneous Class Notes and Lines, Flexible Flow LIne Storage or Retrieval of the class definition for a statement regarding various subcombinations of the above subject matter as related to various classes.

SEE OR SEARCH CLASS:

239,	Fluid Sprinkling, Spraying, and Diffusing, subclasses 195+ for combinations of this subject matter and specific nozzle or outlet arrangement at the terminus of the fluid handling elements.
242,	Winding, Tensioning, or Guiding, subclasses 370+ for a reeling device for handling elongated material including a hose without a specified coupling between a fluid supply and hose.

355.17

.. With means for plural hoses:

	This subclass is indented under subclass 355.16. Apparatus provided with means for accommodating a plurality of flow line conduits.

355.18

.. With flow regulation responsive to hose movement:

This subclass is indented under subclass 355.16. Apparatus provided with a connection between the flow control means for the fluid and the flow conduit or the storing means therefor whereby movement of the conduit or its storing means to flow discharging position actuates the flow control means to fluid transmitting position.

(1) Note. Flow regulation does not include valves operated by the jettisoning or uncoupling of the flow line from the storage or fluid handling system.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclass 149.8 for a valve operated by motion of the flow path.

355.19

... Reel type:

	This subclass is indented under subclass 355.18. Apparatus in which the flow line storing means is a spool or drum and movement of the storing means as a consequence of flow line movement actuates the flow regulating means.

355.2

.. With retrieval means:

This subclass is indented under subclass 355.16. Apparatus provided with means in addition to the hose support or storage means and its associated support against gravity means whereby the flow line conduit is returned to its nonuse or stored position.

(1) Note. A crank mechanism which is connected to the storing means by a force of speed varying mechanism is considered to be a return means for this subclass. A mere crank fixedly attached to a spool or reeling mechanism is considered as no different from direct contact with such retrieval mechanism and does not qualify as the additional means required in this subclass.

SEE OR SEARCH CLASS:

239,	Fluid Sprinkling, Spraying, and Diffusing, subclass 197 for a corresponding field of search involving a specific terminal member.

355.21

... Power stop or brake:

This subclass is indented under subclass 355.2. Apparatus provided with an arresting or checking means acting on the return mechanism.

(1) Note. A dashpot which slows down the final movement of the return means is considered to be a power stop or brake for this subclass.

355.22

.... Responsive to position of hose in casing:

	This subclass is indented under subclass 355.21. Apparatus in which the actuation of the arresting or checking element for the return mechanism responds to the position of the flexible flow line conduit in its housing, or storage encasing means.

355.23

... Biased to retracted position:

	This subclass is indented under subclass 355.2. Apparatus provided with additional means which tends to return the flexible conduit to its nonuse or stored position.

355.24

.... Boom type:

	This subclass is indented under subclass 355.23. Apparatus having a relatively long spar or beam to which at least a portion of the flexible conduit is attached and which is mounted for movement relative to its support.

355.25

.... Weighted:

	This subclass is indented under subclass 355.23. Apparatus in which the means tending to return the flexible flow line to nonuse or stored position is a weight.

355.26

.. Reel with support therefor:

This subclass is indented under subclass 355.16. Apparatus having a spool or drum on which the flow line is wound or coiled and provided with structure to support the spool or drum.

(1) Note. The flow conduit which is ultimately connected to the flexible flow line conduit may also serve as part of or all the bearing or support surface for the spool or drum.

355.27

... Ground supported:

	This subclass is indented under subclass 355.26. Apparatus in which the spool or drum is carried by a frame in contact with and supported by the ground or floor or other similar substantially horizontal surface.

355.28

.. Basket or holder for folded coiled hose:

This subclass is indented under subclass 355.16. Apparatus in which the means for storing the flexible conduit comprises a frame having a bottom and sides whereby the conduit may be looped back and forth or convoluted on itself, in both cases each loop or convolution being contiguous to the next adjacent.

(1) Note. For classification herein, the hose must not be suspended but must be in a housing having a bottom on which the first loop or coil is laid and must have upstanding walls or elements to retain the folded or coiled hose within the confines of the holder.

SEE OR SEARCH THIS CLASS, SUBCLASS:

335.16,

where the hose is folded and suspended from a single peg or link.

356	. Static constructional installations:

This subclass is indented under subclass 343. Apparatus in which the support is a structural member immovably joined to the ground, or in which the casing or protector is immovably joined to and partially or wholly embedded in the ground.

SEE OR SEARCH THIS CLASS, SUBCLASS:

219+,	for Larner-Johnson valves, which are commonly used in underground water systems.
236,	for distribution systems involving geographic features.
272+,	for hydrants and railway water cranes.

SEE OR SEARCH CLASS:

222,	Dispensing, subclasses 173+ for dispenser supports and subclass 192 for dispensers combined with buildings.

357	.. Buildings:

This subclass is indented under subclass 356. Apparatus in which the fluid handling device is mounted in or associated with a building.

SEE OR SEARCH CLASS:

15,	Brushing, Scrubbing, and General Cleaning, subclasses 301+ for installed systems for air blast and suction cleaning.
52,	Static Structures (e.g., Buildings), subclasses 11+ for a cover with an eave or valley gutter, subclasses 131+ for a burial vault with fluid guiding feature, subclass 168 for a building with a protective liquid supply, subclasses 192+ for a liquid or fluent material container with a single port, subclasses 198+ for an enclosure with fluid guiding port to a usable space, subclass 218 for a flue with a fluid directing feature, subclass 219 for a flue connected to a building structure, subclasses 220.1+ for a service duct within a barrier of a building construction, and subclasses 302.1+ for a residual building construction or component with a plugged vent or passage between its interior and the ambient.
169,	Fire Extinguishers, appropriate subclasses, especially subclasses 16+ for fluid distributing systems.
222,	Dispensing, subclass 192 for dispensers combined with building structures.
239,	Fluid Sprinkling, Spraying, and Diffusing, subclasses 200+ , 225.1+ and 273+ for installed systems of that class, especially subclasses 209+ for vehicle washers with overhead fixed supply pipes.

358	... Outside access to portions of the system:

	This subclass is indented under subclass 357. Apparatus in which the building has an external casing or pit connected to the building serving as a housing or a support for part or all of the fluent material device, and having an opening exterior of the building providing admittance to portions of the system.

359	... Escutcheon type support:

This subclass is indented under subclass 357. Apparatus in which the fluid handling system includes a member which surrounds a pipe or pipes and covers the opening through which the pipe or pipes pass through a wall or floor.

(1) Note. The supports, casings, or protectors found in this subclass close the opening around the pipe and provide an ornamental appearance for the arrangement, as well as supporting and/or centering the pipe in the opening.

SEE OR SEARCH THIS CLASS, SUBCLASS:

296,	for caps or covers for hydrant casings.
371,	for closures for valve and meter wells.
380,	for covers for beer cooler faucet apertures.

SEE OR SEARCH CLASS:

220,	Receptacles, subclasses 241+ for closures of the face plate type.
248,	Supports, subclasses 49+ for pipe and cable supports, especially subclasses 56+ for the through-plate type.
292,	Closure Fasteners, subclass 357 for escutcheon plates applied to closure latch devices.

This subclass is indented under subclass 357. Apparatus in which the fluid handling device is mounted on or associated with the wall of a building.

SEE OR SEARCH THIS CLASS, SUBCLASS:

350,	for fluid handling devices associated with the wall of a railway car.
359,	for escutcheon type supports for pipes, etc.

361	.... Recessed gas outlet box:

	This subclass is indented under subclass 360. Apparatus in which the support, casing or protector is a covered space in the wall of building used for concealing the outlet of a gas main.

362	... Floor installation:

This subclass is indented under subclass 357. Apparatus in which the floor of the building or a part thereof acts as a support, casing or protector, the relation being other than that involved in merely setting the device on the floor.

SEE OR SEARCH THIS CLASS, SUBCLASS:

247.43,	for floor installed liquid seal traps.
350,	and 354, for fluid handling systems mounted on or associated with the floor of a vehicle.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclass 295 for pedal type valve actuators passing through the floor of a building.

363	.. Ground supporting enclosure:

This subclass is indented under subclass 356. Apparatus in which the support, casing or protector is a means covering at least a portion of a fluent material system and acting as a support for the ground around the part.

SEE OR SEARCH THIS CLASS, SUBCLASS:

219+,	for Larner-Johnson valves.
236,	for distribution systems involving geographic features.
272+,	for hydrants and railway water cranes, especially subclasses 291+ and 294+, for vertical casings enclosing a water column and/or a valve.

SEE OR SEARCH CLASS:

166,	Wells, appropriate subclasses for wells comprising casings enclosing valves and/or tubing.
239,	Fluid Sprinkling, Spraying, and Diffusing, subclasses 201+ for ground installed or embedded spray systems.
404,	Road Structure, Process, or Apparatus, subclasses 2+ for a drain associated with road structure and subclasses 25+ for a vault cover-closure associated with pavement structure.
405,	Hydraulic and Earth Engineering, subclasses 36+ for below ground irrigation systems; subclasses 132+ for tunnels and methods and apparatus for constructing the same; subclass 154.1 for pipe and cable laying apparatus and methods; and subclass 272 for earth shoring structures.

364	... Valve and meter wells:

This subclass is indented under subclass 363. Apparatus in which the support, casing or protector is an apertured vertical casing partially or wholly surrounding and providing access to a valve or meter connected to a buried pipe line.

SEE OR SEARCH THIS CLASS, SUBCLASS:

291	through 293, for a hydrant having a valve actuator outside its riser.
294	through 297, for a hydrant having a casing.

SEE OR SEARCH CLASS:

73,	Measuring and Testing, subclass 201 for meter casings or supports, and subclass 277 for frostproof meter constructions.

365	.... With means to center well on valve:

This subclass is indented under subclass 364. Apparatus in which the apertured vertical casing, valve or pipe line has a means to cause coincidence of the axis of the valve actuator and the casing, to enable a person applying a removable actuator to locate the valve connection easily.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclasses 291+ for detachable actuators for valves, and see the search notes thereto.

366	..... Detachable base plate:

	This subclass is indented under subclass 365. Apparatus in which the vertical well-forming casing or tube rests on a base plate or section which lies beneath the valve in the pipe, the pipe being held in place between the base plate and the upper section of the casing with the valve centered in the well.

367	..... Vertical casing aligned by valve casing:

This subclass is indented under subclass 365. Apparatus in which the top of the valve casing has means engaging the well-forming casing to insure assembly in proper alignment.

SEE OR SEARCH THIS CLASS, SUBCLASS:

277,	and 287, for vertical fluid channels of the hydrant type with telescopic casings.
315.01	through 329.4, for a fluid handling system with repair, tapping, or assembly means, other than means to hold the system together or in alignment when in operative condition.
369,	and 370, for telescoping valve and meter wells.

368	.... Combined with actuator:

This subclass is indented under subclass 364. Valve wells in which an operating member for the valve extends through the vertical column and terminates at or near the surface of the ground.

SEE OR SEARCH THIS CLASS, SUBCLASS:

272+,	for hydrants, most of which have a vertically extending actuator.
570,	596+ and 625.2+, for drain valves which have vertically extending actuators, especially pump drains and stop and waste devices located in inaccessible places.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclasses 291+ for valves provided with detachable actuators and subclass 293 for valves with extensible actuators.

369	..... Telescopic well casing:

This subclass is indented under subclass 368. Valve wells in which the vertical column is divided into sections slidable one within the other, which sections may be locked together to fix the height of the column.

SEE OR SEARCH THIS CLASS, SUBCLASS:

287,	for vertically mounted fluid channels of the hydrant type having telescopic casings, movement of the conduit actuating the valve.
370,	for telescopic casings comprising valve and meter wells, no valve actuator being claimed.

370	.... Telescopic well casing:

This subclass is indented under subclass 364. Valve wells in which the vertical column is divided into movable sections slidable one within the other, which sections may be locked together to fix the height of the casing.

SEE OR SEARCH THIS CLASS, SUBCLASS:

277,	for a rotatable water crane having a vertically movable riser.
369,	for telescoping casing combined with valve actuator.

SEE OR SEARCH CLASS:

220,	Receptacles, subclasses 3.92 , 3.94, and 4.01+ for sectional and telescoping containers of general application.

371	.... Covers:

This subclass is indented under subclass 364. Devices comprising closures for the upper ends of the valve or meter wells.

SEE OR SEARCH THIS CLASS, SUBCLASS:

295,	and 296, for hydrant casings flush with ground and/or covers or caps for hydrants.
800,	for closures in fluid handling devices, and see the search notes thereto.

SEE OR SEARCH CLASS:

220,	Receptacles, subclasses 200+ for receptacle closures of general application.

372	... Pipe line transport:

This subclass is indented under subclass 363. Apparatus in which the fluent material system is a pipe line.

(1) Note. Pipe systems having means or arrangements to compensate for thermal expansion are found here.

SEE OR SEARCH THIS CLASS, SUBCLASS:

1+,	for processes relating to pipe line flow.
236,	for distribution systems including pipe lines where special accommodation to geographical features is involved.
317+,	for pipe line repair involving tapping a line under pressure.

SEE OR SEARCH CLASS:

138,	Pipes and Tubular Conduits, subclass 105 for pipes in a trench; subclass 108 for underground conduits for supporting cables therein; subclass 113 for underground conduits for supporting pipes therein; and subclasses 124+, 131, 137+, and 140+ for composite pipes and conduits.

373	.. Tapering or tower type:

This subclass is indented under subclass 356. Apparatus in which the longitudinal dimension of the support, casing or protector extends upwardly and is reduced in cross-section at successively higher levels; or in which the support, casing or protector is designed primarily with a view to elevation by making its height greater than its diameter or making its height relatively great by positioning the support on another structure.

SEE OR SEARCH THIS CLASS, SUBCLASS:

376,	for tank supports of other types.

SEE OR SEARCH CLASS:

52,	Static Structures (e.g., Buildings), subclass 40 for a specific tower or shaft supporting another device, e.g., a tank.
222,	Dispensing, subclasses 173+ for dispenser supports.

374	. Furniture and housing furnishings:

This subclass is indented under subclass 343. Apparatus in which the support, casing or protector is the whole or a part of one of the articles of convenience or decoration used to furnish a house or apartment.

(1) Note. The term furniture refers to the movable articles such as chairs, tables, beds, desks, cabinets, stoves, used in a house or apartment as distinguished from the permanent fixtures such as plumbing, and the term house furnishings means small articles such as kitchen utensils or lamps.

SEE OR SEARCH THIS CLASS, SUBCLASS:

247.11+,	especially subclasses 247.33, 247.35, 247.37, and 247.39 for liquid sealed refrigerator drains.
312+,	for fluid handling systems comprising refrigerator drip catchers.
342,	for fluid handling devices associated with items of furniture which claim article supporting surfaces other than a mere top surface, as a shelf.
562,	for distribution systems comprising faucet connected, sink drained devices.

SEE OR SEARCH CLASS:

62,	Refrigeration, subclass 261 for a refrigerator combined with furniture.

This subclass is indented under subclass 343. Apparatus in which the fluent material device is completely or partially surrounded by a layer of heat exchange or non conducting material to promote or prevent heat radiation or absorption, or by a protective cover or layer which may be either outside the fluid confining member or inside it, being in fact a liner in the latter case, the layer or cover being more or less similar in shape or proportions to the enclosed device.

(1) Note. This subclass includes fluent material devices enclosed in a casing to confine air or a vacuum as a heat insulating material means for the fluent material device.

SEE OR SEARCH THIS CLASS, SUBCLASS:

264,	for plural tanks having outlets which provide for flow other than from one tank to another, one of which tanks may be a cooling or insulating jacket for another, but which must have a claimed outlet or inlet for fluent material.
334+,	for heat exchange means involving jackets and casings, especially subclass 336 for flues extending through a casing for heating the contents and subclass 340 for jacket-type heat exchangers with means to cause or direct flow in the fluid heat exchange material.

SEE OR SEARCH CLASS:

150,	Purses, Wallets, and Protective Covers, subclass 156 for a flaccid protective cover for a faucet.
220,	Receptacles, appropriate subclasses, especially subclasses 560.12+ , 592.01+, and 903 for a container having an insulated wall or jacket and 495.01+, 23.9, 23.91, and 908.1+ for a container having a lining or jacket.
222,	Dispensing, subclass 131 for dispensers having a spaced, nondispensing jacket and subclass 183 for other jacketed dispensers.
229,	Envelopes, Wrappers, and Paperboard Boxes, subclasses 117.27+ and 164.2 for a paperboard box having a lining and 103.11 for a thermally insulated paperboard box.

376	. Tank supports:

This subclass is indented under subclass 343. Apparatus in which the fluent material device includes a tank and the support, casing, or protector holds the tank in position with reference to an external area or point of reference.

SEE OR SEARCH THIS CLASS, SUBCLASS:

373,	for tapering or tower type supports.
374,	for systems which are associated with furniture or other house furnishings.
453+,	for barometric type systems.
899+,	for vehicular supports, and see the search notes to subclasses 899 and 351 respectively.

SEE OR SEARCH CLASS:

222,	Dispensing, subclasses 160+ for dispensers which are movably mounted with respect to their supports, and subclasses 173+ for other dispenser supports.

377	. Guards and shields:

This subclass is indented under subclass 343. Devices in which the fluent material handling device or a part thereof is totally or partially surrounded by a casing (1) to prevent damage to an object external to the device, (2) to seal the device against leakage to or from the device outside the normal fluid path, (3) to protect the device or parts thereof or the contents against damage or contamination by contact with external objects, dirt or germs, or (4) to prevent unauthorized use.

(1) Note. The guard or protector must be external to the system, so that it does not serve to confine or control the material in the system nor to close the flow openings of the system.

SEE OR SEARCH THIS CLASS, SUBCLASS:

294+,	for hydrant casings, especially subclass 296 for a cap, cover or hood used as a guard on a hydrant.
317,	for antisplash shields used to prevent escape of fluid when a pressure system is tapped.
375,	for casings which are close fittings or of a shape generally corresponding to that of the device, and substantially complete, and see the search notes thereto.
383+,	for locks or seals to prevent unauthorized use.

SEE OR SEARCH CLASS:

222,	Dispensing, subclass 182 for covers for the operating parts of dispensers; subclass 192 for bumpers and guards for dispensers.
251,	Valves and Valve Actuation, subclasses 89+ for valves provided with actuator disabling means to prevent unintentional operation.

378	.. Resilient abutment for preventing breakage:

This subclass is indented under subclass 377. Guards or shields in which a spigot or faucet of a fluent material device is provided with a shock absorbing fixture or attachment which will be struck by a container when moved into position for filling from the spigot or faucet.

SEE OR SEARCH CLASS:

141,	Fluent Material Handling, With Receiver or Receiver Coacting Means, subclass 149 for receiver lift means with additional cushioning means, subclass 289 for laterally shiftable vent tubes, and subclasses 351+ for receiver actuated discharge means.
251,	Valves and Valve Actuation, subclass 156 for receptacle operated nonstop valves.

379	.. Nozzle abutment for scratch or damage prevention:

This subclass is indented under subclass 377. Guards or shields in which a nozzle of a fluent material device is provided with an attachment or fixture to prevent scratching of the surface of a container into which the nozzle is inserted.

SEE OR SEARCH THIS CLASS, SUBCLASS:

801,	for nozzles and spouts in fluid handling systems, and see the search notes thereto.

SEE OR SEARCH CLASS:

222,	Dispensing, subclass 566 for nozzles, spouts and pouring devices for dispensers.

380	.. Cover for beer cooler aperture for faucet:

This subclass is indented under subclass 377. Guards or shields in which a closure member seals the opening between the spigot and refrigerator casing of a beer cooler.

SEE OR SEARCH THIS CLASS, SUBCLASS:

317,	for shields for sealing the opening between a beer keg and spigot of the tapping type.
359,	for escutcheon type supports for pipes passing through the walls of buildings.

SEE OR SEARCH CLASS:

292,	Closure Fasteners, subclass 357 for escutcheons for closure fastener elements.

381	.. Sanitary covers or shields:

This subclass is indented under subclass 377. Guards and shields which comprise (1) a cylindrical or conical member attached to the spout of the fluent material device to prevent contamination of the spout either during or after the flow of fluent material; or (2) a movable shield that covers the outlet area or spout when not in use.

(1) Note. Where the movable guard covers only the outlet end of the spout and actually closes it against flow, it is considered to be a valve or closure and classification is on that basis.

SEE OR SEARCH THIS CLASS, SUBCLASS:

800,	for closures in fluid handling systems, and see the search notes thereto.

SEE OR SEARCH CLASS:

222,	Dispensing, subclass 182 for guards or covers for operating parts of a dispenser.
251,	Valves and Valve Actuation, subclass 155 for arrangements wherein a valve or closure covers a spout.

382	.. Valve guards:

This subclass is indented under subclass 377. Guards and shields in which the valve member of a fluent material device (1) is enclosed in a casing which is locked against unauthorized use of the valve; or (2) has an internal key which is fastened to another object to prevent movement of the valve to an unauthorized position; or (3) in which the valve is totally or partially enclosed in a casing or shield or has casings covering all or part of the operating handle or stem or a valve to protect the stem or operating handle against damage or unintentional movement to or from a desired position.

SEE OR SEARCH THIS CLASS, SUBCLASS:

312+,	for valves combined with casings which act as drip catchers.
383+,	for valves with locks but without casings totally or partially enclosing the valve.
586,	for distribution systems in which there is an interlock between a valve actuator and a closure for an access opening.
613+,	for closures used in series with a valve in distribution systems.

SEE OR SEARCH CLASS:

222,	Dispensing, subclasses 173+ for dispenser guards in the nature of casings.
251,	Valves and Valve Actuation, subclasses 89+ for valve actuator holding means and subclass 297 for detents which are not enclosing devices.

382.5

... With means for accommodating a detachable actuator:

This subclass is indented under subclass 382. Devices wherein there is a particularly shaped aperture in the casing to accommodate a detachable actuator having a particular shape and being adapted to engage the valve stem inside the casing.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclasses 291+ for other valves with detachable actuators.

383	WITH LOCK OR SEAL:

This subclass is indented under the class definition. Apparatus including a lock means which prevents unauthorized use or adjustment or a sealing means the breaking of which indicates unauthorized use or adjustment.

(1) Note. To be classified here the lock means must be a lock as defined in Class 70 and not merely a latch or detent.

SEE OR SEARCH THIS CLASS, SUBCLASS:

382,	for valve guards and shields, including boxes which are locked.

SEE OR SEARCH CLASS:

70,	Locks, appropriate subclasses for locks, per se.
141,	Fluent Material Handling, With Receiver or Receiver Coacting Means, subclasses 346+ for combined filling devices and receivers having interlocked discharge means, support or coupling, and subclasses 348+ for supply means carried receiver flow control opening means.
222,	Dispensing, subclasses 153.01+ for dispenser locks or fastening seals.
292,	Closure Fasteners, subclasses 307+ , 327 and 328+ for seals of the closure fastening type.

384	. With seal:

This subclass is indented under subclass 383. Apparatus which uses a seal as a means for preventing and/or indicating unauthorized use or adjustment.

SEE OR SEARCH CLASS:

222,	Dispensing, subclasses 153.05+ for dispenser fastening seals.
292,	Closure Fasteners, subclasses 307+ for seals of the closure fastener type, subclass 327 for seal bolts and subclasses 328+ for shackles for seals.

384.2

. Common lock and valve actuator:

	This subclass is indented under subclass 383. Devices in which the structure which is employed to actuate the lock also actuates the valve.

384.4

.. Combination lock:

	This subclass is indented under subclass 384.2. Devices in which the lock comprises an element which is, or a plurality of elements which are, manually manipulable in a predetermined sequence, or to a predetermined position to effect the operation of the lock.

384.6

.. Biased valve:

	This subclass is indented under subclass 384.2. Devices in which the valve head is biased to or from the open position.

384.8

.. Mechanical movement between lock and valve:

	This subclass is indented under subclass 384.2. Devices in which the valve head is connected to the lock and actuated therewith by means comprising two or more fixed and movable parts so combined that the motion of one compels or completely controls or constrains motion of the other according to a law of operation inherent in and depending on the nature of the combination.

385	. Locks against rotary motion:

	This subclass is indented under subclass 383. Apparatus with a lock means the proximate effect of which is to prevent rotation of a rotatable element.

386	LIQUID LEVEL RESPONSIVE OR MAINTAINING SYSTEMS:

This subclass is indented under the class definition. Apparatus which includes an element which senses the level of a liquid in means to receive an accumulation thereof and in response thereto exercises a control of the flow of fluid or acts to maintain that level of the liquid.

(1) Note. Apparatus which maintains the liquid level by means of overflow pipes or arrangements only is excluded from this and indented subclasses, since there is not change in the operation or relative position of any of the parts of the system which is caused by or related to the maintenance of or failure to maintain the level.

(2) Note. Valve actuating means operated by diverting a part of the flow into a metering device have been classified as valve actuators, even though the metering device is a level responsive type.

SEE OR SEARCH THIS CLASS, SUBCLASS:

101.25+,	for a self-proportioning system with liquid level sensing.
132+,	for periodic siphons, i.e., those which discharge as often as a certain level is reached in the supply container or receiver.
154+,	for pressure systems containing diverse fluids which include a control of fluid in response to a liquid level, especially subclasses 197+ for the hygroscopic type of discriminating outlet for gas.
213+,	for diverse fluid containing pressure systems having level responsive gas vents or whistles.
262,	for flow dividing compartments, the outlet from one of which may be a level maintaining overflow.
561+,	for apparatus which maintains a desired level in a container by a continuous over-supply, especially subclasses 563+ for such systems which return the overflow to the supply and 577+ for tanks with movable or adjustable overflow including float supported tank outlets in subclass 578. See (1) Note.
624.14,	for repeating cycle valves actuated by line fluid only.

SEE OR SEARCH CLASS:

62,	Refrigeration, subclass 188 and 218+ for refrigeration means having liquid level control.
222,	Dispensing, subclasses 52+ for automatic dispensers, especially subclass 62 for those having a float controlled pressure liquid and subclasses 64+ for material level control.
251,	Valves and Valve Actuation, subclasses 12+ for valves actuated by flow metering arrangements, and subclasses 15+ for valves having compulsory cutoff after a flow period. See (2) Note, above.
399,	Electrophotography, subclasses 237+ for liquid developer applied to a latent image within an electrophotos:graphic device.
417,	Pumps, subclasses 36+ for control of a pump drive motor in response to liquid accumulation of pump fluid.

387	. Washing machine cycle control:

This subclass is indented under subclass 386. Apparatus in which the cycle of operation of a washing machine is controlled in response to a change in liquid level.

SEE OR SEARCH THIS CLASS, SUBCLASS:

240,	for the addition of separate material in an installed cleaning system.
268,	for the addition of nonfluid material to a flow system.
331+,	for cyclic or program type actuation of valves.

SEE OR SEARCH CLASS:

68,	Textiles: Fluid Treating Apparatus, appropriate subclasses for automatic washing machines, especially subclasses 12.01+ for single tub machines with automatic sequential operation.

388	. Liquid excluding devices for gas inlet or outlets:

This subclass is indented under subclass 386. Apparatus wherein a liquid level responsive device is provided to exclude an external liquid from a gas inlet or outlet such as a shipboard ventilator.

SEE OR SEARCH THIS CLASS, SUBCLASS:

40+,	for marine governors, i.e., control by position of a device relative to a body of water.
45+,	for control by a pendulum or swinging member responsive to position or inertia of a system.
197+,	for discriminating outlets for gas in fluid separating traps or vents for diverse fluid containing pressure systems.

SEE OR SEARCH CLASS:

49,	Movable or Removable Closures, subclasses 21+ for a closure responsive to or directly actuated by ambient fluid.
114,	Ships, subclass 212 for ship ventilating valves.
160,	Flexible or Portable Closure, Partition, or Panel, subclass 5 for weather initiated automatic control of flexible closures and panels, e.g., screens, awnings, etc.

389	. With second diverse control:

This subclass is indented under subclass 386. Apparatus wherein the level responding or maintaining flow is increased or diminished by an external means or in response to a change in condition other than liquid level, either by a means acting upon the liquid level responsive control means or by a second means in series or parallel therewith.

(1) Note. See the class definition, section 3 for collected search notes on automatic and combined automatic and nonautomatic controls in this class.

SEE OR SEARCH THIS CLASS, SUBCLASS:

410,	for valves which are opened by external means and closed by float means.

390	.. Manual control:

This subclass is indented under subclass 389. Apparatus in which the second control is a manual control.

SEE OR SEARCH THIS CLASS, SUBCLASS:

181,	for traps in diverse fluid containing pressure systems having automatic liquid discharge control with an auxiliary manual control.

391	. Control of both inflow and outflow of tank:

This subclass is indented under subclass 386. Apparatus which includes means responsive to variations of the level of the accumulated liquid to control both the inflow to and outflow from an accumulation of liquid.

SEE OR SEARCH THIS CLASS, SUBCLASS:

214,	for high and low level response associated with gas vents or whistles in diverse fluid containing pressure systems.

SEE OR SEARCH CLASS:

222,	Dispensing, subclass 68 for plural float operated flow controllers in dispensers.

392	. Electrical characteristic sensing:

This subclass is indented under subclass 386. Apparatus in which the liquid level is sensed by sensing an electrical characteristic of a liquid.

SEE OR SEARCH THIS CLASS, SUBCLASS:

5,	for processes of fluid mixing controlled by the conductivity of the mixture.
93,	for self correlating systems controlled by optical or chemical properties of the ingredients.

393	. With control fluid connection at desired liquid level:

This subclass is indented under subclass 386. Apparatus wherein the level to be controlled is in a pressure tank, as a boiler, and a separate control chamber is provided to control a liquid inflow or outflow line of the tank. The control chamber is provided with a connection to the tank at the desired liquid level so that when the liquid is above this level the chamber is filled with liquid by the tank pressure and when the liquid is below the desired level the liquid in the control chamber is drained to the pressure tank. The presence or absence of liquid in the control chamber causes the control of the liquid inflow or outflow line of the tank.

SEE OR SEARCH THIS CLASS, SUBCLASS:

158,	for other liquid level devices of this type which further control the application of a gas pressure to a feed trap to discharge the same to a boiler.

395	. Control of outflow from tank:

This subclass is indented under subclass 386. Apparatus which include means to control the outflow from the accumulation thereof in response to an element sensing the level of the accumulated liquid.

(1) Note. A patent to be classified in this or indented subclass must claim control of the outflow. Level responsive valve control which may control either an inflow or outflow and claimed broadly is classified in later subclasses of this group.

SEE OR SEARCH THIS CLASS, SUBCLASS:

165+,	for float operated discharge of liquid feed traps to boilers.
192+,	for float operated discriminating outlets for liquids in diverse fluid containing pressure systems.
202,	for float operated discriminating outlets for gas in diverse fluid containing pressure systems.

396	.. Self-emptying tanks:

This subclass is indented under subclass 395. Apparatus in which a means sensing a predetermined, usually high, liquid level or a full condition of a tank which is accumulating liquid controls the opening of the tank outlet, allowing the liquid to discharge, and the closing of the outlet at a low level or when the tank is empty, the cycle being repeated as long as liquid is supplied to the tank.

SEE OR SEARCH THIS CLASS, SUBCLASS:

102+,	for the supply and exhaust type of self-controlling system, e.g., hydraulic cycle devices and pulsators.
132+,	for tanks which are periodically discharged by means of a siphon.
156+,	for self emptying tanks, usually comprising boiler feed traps, emptied by gas pressure, especially subclasses 165+ for those controlled by floats.
391,	for tanks with liquid level responsive control of both inflow and outflow.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclasses 12+ for fluid actuated or retarded device receiving liquid diverted from the main line and controlling a valve in the main line in accordance with the quantity of diverted liquid accumulated.

397	... By float:

This subclass is indented under subclass 396. Apparatus in which the means sensing the liquid level floats in the liquid and is buoyed up thereby.

SEE OR SEARCH THIS CLASS, SUBCLASS:

398+,	for float control of the outlet to an accumulation of liquid in tanks which are not self-emptying.
409,	for float control of valves not necessarily outlet valves, and see the search notes thereto.

398	.. By float:

This subclass is indented under subclass 395. Apparatus which includes one or more floats responsive to a change in the level of the accumulated liquid.

SEE OR SEARCH THIS CLASS, SUBCLASS:

391,	for level responsive control of both inflow and outflow of a tank.
409+,	for similar devices in which the valve is not necessarily an outlet valve, and see the search notes to subclass 409.

SEE OR SEARCH CLASS:

4,	Baths, Closets, Sinks, and Spittoons, subclasses 9+ for water closet tanks and bowls having float control means, especially subclasses 331 and 353+.
222,	Dispensing, subclasses 64+ for level responsive control of dispensers.

399	... Low level safety cut-off:

This subclass is indented under subclass 398. Apparatus wherein the outflow is closed in response to the presence of a low level in the liquid accumulation.

(1) Note. The float control in patents placed in this subclass is not intended to regulate liquid level but is designed to function as a safety control to prevent an undesired occurrence in the outlet pipe, such as entrance of air or sediment.

SEE OR SEARCH CLASS:

222,	Dispensing, subclass 66 for dispenser type material level control comprising an empty container cut-off.

400	. With supplemental or safety closing means or bias:

	This subclass is indented under subclass 386. Apparatus which (1) includes the application of a supplemental force or bias that will insure the closing of the valve controlled by the liquid level responsive means, or (2) is combined with means to insure that the flow is stopped, in case the valve fails to close properly when urged in closing position by the liquid level sensing means.

401	.. Sinking or bucket type float:

This subclass is indented under subclass 400. Apparatus in which the means sensing the liquid level is an open or bucket type float which floats to urge the valve closed, and in the event that the valve controlled thereby does not properly close the continued rise of liquid level will cause the float to fill with liquid and sink in the liquid to apply the supplemental safety closing bias or means.

SEE OR SEARCH THIS CLASS, SUBCLASS:

404,	for other open or bucket type floats, and see the search notes thereto.

402	.. Gravitating tank:

This subclass is indented under subclass 400. Apparatus wherein the supplemental closing bias or means responds to or is actuated by a gravitating tank.

SEE OR SEARCH THIS CLASS, SUBCLASS:

403+,

for level control by means of the weight of accumulated liquid, and see especially the search notes to subclass 408.

403	. By weight of accumulated fluid:

This subclass is indented under subclass 386. Apparatus in which the liquid level is sensed by means responsive to the weight or pressure head of the accumulated liquid.

(1) Note. The receptacle which accumulates the pressure head to be sensed must be specifically related to the particular sensing means. A general statement that the sensing means is responsive or is merely connected to some receptacle, e.g., a tank, is insufficient basis for classification here.

SEE OR SEARCH THIS CLASS, SUBCLASS:

129,	and 134, for weight or fluid operated devices associated with siphons.
161,	162+, 189+, and 204, for weight of fluid operated devices associated with diverse fluid containing pressure systems.
188+,	for fluid separating traps with discriminating outlet for liquid controlled by weight or pressure of the accumulated liquid.
396,	for apparatus controlling the outflow from a self-emptying tank by weight of accumulated liquid.
402,	for gravitating tank as a supplemental or safety closing means or bias.
455+,	for line pressure responsive valves not specifically related to a particular accumulating receptacle.

SEE OR SEARCH CLASS:

177,	Weighing Scales, subclasses 60+ for weigher responsive material control of general application.
222,	Dispensing, subclasses 52+ especially subclasses 56-58 for similar arrangements in dispensers.
251,	Valves and Valve Actuation, subclasses 12+ for fluid pressure actuated valves which are not condition responsive.
417,	Pumps, subclass 38 for a liquid pressure sensor for sensing liquid accumulation to control a pump drive motor.

404	.. In sinking or bucket type float:

This subclass is indented under subclass 403. Apparatus in which the liquid level is sensed by an open or bucket type element which floats on the liquid accumulation when empty and subsequently is filled with the liquid.

SEE OR SEARCH THIS CLASS, SUBCLASS:

129,	for plural siphons with the main siphon operated by a sinking or bucket type float.
163,	for gas pressure discharge of liquid feed traps with the gas pressure controlled by sinking or bucket type float.
185,	for an inverted bucket or gas collecting float controlling a discriminating outlet for liquid in a diverse fluid containing pressure system.
190+,	for fluid separating traps with discriminating outlets with fluid responsive valve with sinking or bucket type float control.
401,	for tank outflow control comprising supplemental or safety closing bias or means and a sinking float.

405	.. Oil burner fuel overflow preventing safety cut-offs:

This subclass is indented under subclass 403. Apparatus including a valve arranged to cut off the fuel supply to an oil burner or the like in response to a predetermined accumulation of unburned liquid fuel.

SEE OR SEARCH THIS CLASS, SUBCLASS:

120,	for control of branched flow by filling auxiliary tank.
121,	for control of branched flow by filling outlet tank or receiver.
456+,	for line condition responsive safety cut-offs requiring resetting.

SEE OR SEARCH CLASS:

141,	Fluent Material Handling, With Receiver or Receiver Coacting Means, subclasses 198+ for filling devices having feed cut-off responsive to accumulation in the receptacle being filled.
431,	Combustion, subclass 65 for a burner assembly having a control responsive to collected fuel overflow cutting off feed to the burner head.

406	.. In communicating measuring vessel:

This subclass is indented under subclass 403. Apparatus in which the weight or pressure head of the liquid is sensed in a vessel which is separate from the liquid accumulation but is in communication therewith.

(1) Note. Both auxiliary gravitating tanks and stationary devices for measuring a static head are included.

SEE OR SEARCH THIS CLASS, SUBCLASS:

120,	for alternate or successively substituted flows from a source with control by filling an auxiliary gravitating tank.
134,	for an auxiliary receptacle accumulator for starting a siphon.
154+,	for diverse fluid containing pressure system traps, which are in effect communicating measuring vessels, though not necessarily concerned with level.
393,	for level responsive devices including a liquid weight or pressure sensing chamber connected to a tank at the desired liquid level.

407	... Top and bottom connections:

This subclass is indented under subclass 406. Apparatus in which the separate measuring vessel is provided with connections with the liquid accumulation at both the top and bottom of the measuring vessel.

SEE OR SEARCH THIS CLASS, SUBCLASS:

563+,

for distribution systems of the closed circulation type.

408	.. In gravitating tank:

This subclass is indented under subclass 403. Apparatus in which a single gravitating tank, with or without its mounting means, constitutes both the liquid accumulating means and the liquid level sensing means.

(1) Note. This subclass also takes the subcombination in which the valve or flow controlling means operated by the gravitating tank is not claimed.

SEE OR SEARCH THIS CLASS, SUBCLASS:

120,	for control of branched flow by filling of an auxiliary gravity tank.
161,	and 162+, for gas pressure discharge of liquid feed-traps with gas pressure controlled by amount of liquid in trap by gravitating vessel, and 189 for valves in diverse fluid containing pressure systems controlled by gravitating vessels.
189,	for fluid separating traps with discriminating outlet for liquid controlled by gravitating vessel.
402,	for gravitating tank controlled tank outflow when supplemental or safety closing bias or means is involved.
404,	for sinking or bucket float type gravitating tanks, and see the search notes thereto.
406+,	for level response control means comprising an auxiliary gravitating tank.

SEE OR SEARCH CLASS:

177,	Weighing Scales, subclasses 60+ for a gravitating tank in an automatic weigher.
222,	Dispensing, subclasses 52+ especially subclasses 56-58 for dispensing controlled by quantity or weight.
417,	Pumps, subclass 37 , for a movable liquid receptacle for sensing liquid accumulation to control a pump drive motor.

409	. By float controlled valve:

This subclass is indented under subclass 386. Apparatus wherein the element which senses the liquid level floats on the liquid and is buoyed up thereby.

SEE OR SEARCH THIS CLASS, SUBCLASS:

41,	for float controlled marine governors.
131,	for siphon discharge receiver with float control for siphon.
135,	for float operated inlets to siphons.
137,	for float operated vents in periodic siphons.
165+,	192+ and 202, for float controlled traps and valves in diverse fluid containing pressure systems.
247.21,	for a ball-type float in combination with a liquid seal means.
397,	for float control in self emptying tanks.
398+,	for control of the outflow from the liquid accumulation in response to a float.
404,	for bucket type floats, and see the search notes thereto.

SEE OR SEARCH CLASS:

4,	Baths, Closets, Sinks, and Spittoons, appropriate subclasses for float operated devices of that class.
73,	Measuring and Testing, subclass 322.5 for floats, per se.
166,	Wells, subclass 54 for automatically operated well apparatus comprising float controlled valves.
222,	Dispensing, subclasses 62 , 66 and 67+ for float controlled dispensers.
417,	Pumps, subclasses 40+ for a float which senses liquid accumulation to control a drive motor.

410	.. Valve opened by external means, closing or closing control by float:

This subclass is indented under subclass 409. Apparatus wherein the flow controlling valve is opened by external means and its closing is in response to or is controlled by a float.

SEE OR SEARCH THIS CLASS, SUBCLASS:

389,	for float controlled valves having external means either assisting or substituted for the float operation.
456+,	for condition change responsive valves which must be reset by external means.

SEE OR SEARCH CLASS:

4,	Baths, Closets, Sinks, and Spittoons, subclasses 381+ for tank outlet valves which are latched open and released by a float.
251,	Valves and Valve Actuation, subclasses 15+ for apparatus for flush type valves which are opened by external means, the closing being delayed or controlled by fluid pressure operated member, and subclasses 66+ for biased trip valves which are not released or reset by condition responsive means.

411	.. Single float controls plural valves:

This subclass is indented under subclass 409. Apparatus in which a single float controls a plurality flow controlling means.

SEE OR SEARCH THIS CLASS, SUBCLASS:

168,	for float responsive unitary inlet and outlet valves in gas pressure discharge of liquid feed traps to boilers.
391,	for the control of both the inflow and outflow from the liquid accumulation.

SEE OR SEARCH CLASS:

222,	Dispensing, subclass 67 for plural float operated flow controllers in dispensers.

412	.. Servo relay operation of control:

This subclass is indented under subclass 409. Apparatus in which the float controls the application of another source of power for operating the flow controlling means rather than acting directly through a mechanical connection.

SEE OR SEARCH THIS CLASS, SUBCLASS:

191,	and 195, for servo control with sinking type floats in pressure systems containing diverse fluids.

SEE OR SEARCH CLASS:

91,	Motors: Expansible Chamber Type, appropriate subclasses for fluid servo-motors.
251,	Valves and Valve Actuation, subclasses 25+ for fluid pressure servo-motor operation of valves (and see the search notes to subclass 25), subclasses 68+ for electrical actuation of biased trip type valves, and subclasses 129+ for electrical actuation of valves, especially subclass 131 for remote control of such actuators.

413	... Fluid pressure:

This subclass is indented under subclass 412. Apparatus in which the float controls the application of fluid pressure for operating the flow control means.

SEE OR SEARCH CLASS:

91,	Motors: Expansible Chamber Type, appropriate subclasses for fluid servo-motors.
251,	Valves and Valve Actuation, subclasses 25+ for fluid pressure servo valve actuation which are operated by external means or in which the operating means is not specifically claimed, and see the search notes to subclass 25.

414	.... Flexible diaphragm valve:

This subclass is indented under subclass 413. Apparatus in which the flow control means is a valve comprising a flexible diaphragm.

SEE OR SEARCH THIS CLASS, SUBCLASS:

777+,

for expansible chamber devices, especially subclasses 784+ for the flexible wall type, and subclasses 793+ for diaphragms, per se.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclasses 25+ for fluid servo-motor actuation of valves, and especially subclasses 45 and 46 for those involving diaphragm valves and/or motors.

415	.... From tank:

This subclass is indented under subclass 413. Apparatus in which the source of fluid pressure is the tank holding the liquid accumulation to the level of which the float responds.

(1) Note. Many of the patents in this subclass utilize the steam pressure in a boiler for operating a valve controlling the flow of water into the boiler.

SEE OR SEARCH THIS CLASS, SUBCLASS:

156+,	for gas pressure discharge of liquid feed traps to a boiler.
192+,	and 202, for float controlled discriminating outlets for liquid and gas in diverse fluid containing pressure systems.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclasses 33+ for valves actuated by fluid servo-motors deriving working fluid from the line controlled by the valve.

416	.. Quick acting:

This subclass is indented under subclass 409. Apparatus in which the float and/or the flow control means is operated during a shorter length of time than would be the case if the float and valve were free to respond continuously to the change in liquid level.

SEE OR SEARCH CLASS:

251,

Valves and Valve Actuation, subclass 75 for valve actuation of the snap action type, and see the search notes thereto, subclass 76 for valve actuators of the impact type, and see the search notes thereto, and subclasses 77+ for valve actuation involving lost motion, and see the search notes thereto.

417	... Pilot float released:

This subclass is indented under subclass 416. Apparatus in which the float operating the flow controlling means is restrained from freely responding to the changing liquid level and is released from restraint by a second or auxiliary float.

SEE OR SEARCH THIS CLASS, SUBCLASS:

420+,

for other trip mechanisms for float controlled valves.

418	... Over center mechanism:

This subclass is indented under subclass 416. Apparatus in which the quick action of the flow controlling means is obtained by use of a mechanism which has a faster or accelerated rate of motion after it passes a center position than its rate of motion before attaining the center position.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclass 75 for snap acting valves not of level or condition responsive types, and see the search notes thereto.

419	.... Shifting weight:

This subclass is indented under subclass 418. Apparatus wherein the change in rate of motion is obtained by the use of a shifting weight.

SEE OR SEARCH THIS CLASS, SUBCLASS:

424+,

for float controlled valves with counterbalance means.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclass 338 for weight biased valves, and see the search notes thereto.

420	... Trip mechanism:

This subclass is indented under subclass 416. Apparatus in which the flow control means is provided with a biasing means urging it in one direction which means is restrained by a latch or similar element, which latch is released by means of the float.

SEE OR SEARCH THIS CLASS, SUBCLASS:

463,	for safety cut-offs responsive to a line condition and employing fluid released trips.
467,	for fluid released latches responsive to a line condition to allow the valve to open.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclasses 66+ for biased trips controlling valves and operated at will, and see the search notes to subclass 66.

421	.... Weight or spring bias:

This subclass is indented under subclass 420. Apparatus which includes a weight or spring as the biasing means.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclasses 66+ for biased trip actuated valves, especially subclass 72 for weight biased trips, and see the search notes to subclass 66.

422	... Lost motion mechanism:

This subclass is indented under subclass 416. Apparatus in which during a part of its travel the float moves without producing a corresponding movement of the flow control means.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclasses 77+ for valve actuators including a lost motion mechanism, and see the search notes to subclass 77.

423	.. Plural floats:

This subclass is indented under subclass 409. Apparatus which includes a plurality of floats.

SEE OR SEARCH THIS CLASS, SUBCLASS:

391,	for apparatus including plural floats which control the inlet to and outlet from a tank.
411,	for a single float controlling plural valves.
417,	for apparatus including a pilot or auxiliary float for releasing a float controlling the flow control means to provide a quick acting mechanism.

SEE OR SEARCH CLASS:

222,	Dispensing, subclass 68 for plural float actuated valves in dispensers.

424	.. With counter-balance:

This subclass is indented under subclass 409. Apparatus in which the float is provided with means to apply a force which at least partially counterbalances the weight of the float and valve assembly or which partially counterbalances the buoyancy of the float.

SEE OR SEARCH THIS CLASS, SUBCLASS:

419,	for quick acting float valves having an over center mechanism with a shifting weight.

425	... Within tank:

	This subclass is indented under subclass 424. Apparatus in which the counterbalancing means is within the tank holding the liquid accumulation.

426	.. Level adjustment or selection means:

This subclass is indented under subclass 409. Apparatus in which the valve operating mechanism can be preset to respond at any one of a plurality of levels, by making appropriate changes in the connections between the valve and the float or any intermediate linkage or mechanism.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclass 234 for adjustable lever type actuators for valves, and see the search notes thereto.

427	.. With float leakage disposal:

This subclass is indented under subclass 409. Apparatus in which means is provided for removing from the interior of a float material which may leak into it.

SEE OR SEARCH THIS CLASS, SUBCLASS:

312+,

for means for collecting material which escapes from the desired flow path and either returning it to the system or disposing of it, and see the search notes to subclass 312.

428	.. In separate communicating float chamber:

This subclass is indented under subclass 409. Apparatus where the float is in a chamber separate from the holder for the liquid accumulation, but which chamber is connected therewith so that the variation in liquid level in the chamber corresponds to that in the holder.

SEE OR SEARCH THIS CLASS, SUBCLASS:

406+,	for communicating measuring vessels responding to weight or head of accumulated fluid.
571+,	for plural tanks connected for serial flow, and see the search notes to subclass 571.

429	.. Rectilinearly traveling float:

	This subclass is indented under subclass 409. Apparatus in which the float is guided or so constructed and mounted that its path of movement will necessarily be along a straight line.

430	... Float co-axial with valve or port:

	This subclass is indented under subclass 429. Apparatus in which the path of travel of the float is co-axial with the valve or part controlled in response to the float.

431	.... Float is spreader or anti-splash means:

This subclass is indented under subclass 430. Apparatus in which the float acts as spreading, distributing or antisplash means for the liquid flow controlled thereby.

SEE OR SEARCH THIS CLASS, SUBCLASS:

436+,	for flow guides or restrictors for float arm operated valves.
582,	for distribution systems having anti splash means not in the flow passage.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclasses 118+ for valves combined with material guides or restrictors in the flow passage which may function to reduce turbulence or splashing.

432	.... Float surrounds inlet pipe:

This subclass is indented under subclass 430. Apparatus in which the float surrounds the inlet pipe for the fluid the flow of which is controlled by the valve.

SEE OR SEARCH THIS CLASS, SUBCLASS:

431,	for similar arrangements in which the float comprises a spreader or anti-splash means.

433	.... Float rigid with valve:

	This subclass is indented under subclass 430. Apparatus in which the float and valve controlled thereby are rigidly connected together.

434	.. Float arm operated valve:

This subclass is indented under subclass 409. Apparatus in which the float responding to variations in liquid level is connected to the flow control means by means of a rod or arm which is pivoted at an end thereof and the arm turns about the pivot during operation.

SEE OR SEARCH CLASS:

4,	Baths, Closets, Sinks, and Spittoons, appropriate subclasses for water closet tanks and bowls with float controlled valves.
222,	Dispensing, subclasses 64+ for dispensers with float arm operated valves.
251,	Valves and Valve Actuation, subclasses 213+ for mechanical movement valve actuators, especially subclasses 231+ for lever type mechanical movements.

435	... With valve retarder or cushion means:

This subclass is indented under subclass 434. Apparatus which includes in addition to the float mechanism, means to retard or cushion the rate of closing or opening of the flow controlling valve.

SEE OR SEARCH THIS CLASS, SUBCLASS:

470,	for line pressure responsive valves which have a reactor component tending to close them as soon as they open.
624.11+,	for a time controlled valve.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclasses 12+ for fluid retarded valves, subclass 64 for valves with nonfluid retarders, and subclasses 118+ for valves with material guides or restrictors which retard the operation of a valve to which they are connected.

436	... With flow guide or restrictor:

This subclass is indented under subclass 434. Apparatus including means to restrict or act as a guide for the flow of liquid to or from the valve controlled by the float.

(1) Note. Many of these restrictors have the effect of silencing the fluid flow.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclasses 117 and 118+ for other valves combined with flow guides or restrictors, and see the search notes to subclass 118.

437	.... External hood or deflector or annular outlet surrounding the inlet pipe:

This subclass is indented under subclass 436. Apparatus in which the restrictor or flow guide is an external hood or deflector or annular outlet surrounding the inlet pipe.

SEE OR SEARCH THIS CLASS, SUBCLASS:

431,	and 432, for floats surrounding the flow pipe and acting as spreaders or deflectors.

438	... Movable nozzle or inlet terminal:

This subclass is indented under subclass 434. Apparatus wherein the float means moves the nozzle or inlet terminal for controlling the flow.

SEE OR SEARCH THIS CLASS, SUBCLASS:

578,	for float supported movable outlet elements.
592,	for internally extending inlet pipes in distribution systems, and see the search notes thereto.
615+,	for articulated or swinging flow conduits in distribution systems, and see the search notes to subclass 615.

439	... Valve removable from outside container:

This subclass is indented under subclass 434. Apparatus in which the valve controlled by the float is removable from outside the container holding the liquid accumulation.

(1) Note. In the arrangements classifiable in this subclass the valve is usually removable for replacement or repair purposes, the float means and linkage remaining in the tank.

SEE OR SEARCH THIS CLASS, SUBCLASS:

326,	for a fluid handling system with repair, tapping, or assembly means to extract a foot valve from top of an enclosure.

440	... With U-shaped inlet pipe having terminal valve:

This subclass is indented under subclass 434. Apparatus in which the inlet pipe is reversed upon itself in substantially a "U" shape and is provided with the float operated valve on the terminal thereof.

SEE OR SEARCH THIS CLASS, SUBCLASS:

123+,	for siphons.
215+,	for back flow prevention in flow lines of inverted U shape which are not primarily intended to operate as siphons.
442+,	for other inlet terminal float arm operated valves.
591,	for tanks having internally extending flow pipes of inverted U shape.

441	... With refill pipe:

This subclass is indented under subclass 434. Apparatus which includes a pipe carrying a part of the flow through the float arm controlled valve out of the tank holding the liquid accumulation the level of which controls the float.

(1) Note. Many of the patents in this subclass are for refilling a toilet trap.

SEE OR SEARCH THIS CLASS, SUBCLASS:

561+,

for distribution systems involving branch flow, especially subclasses 608+ for those having a single inlet and plural outlets.

SEE OR SEARCH CLASS:

4,	Baths, Closets, Sinks, and Spittoons, subclasses 300+ for water closets of the tank type.

442	... Assembly mounted on and having reciprocating valve element coaxial with inlet pipe:

This subclass is indented under subclass 434. Apparatus in which the float arm, the valve operated thereby and the connections therebetween comprise an assembly which is mounted on the inlet pipe and in which the valve element reciprocates co-axially with respect to the inlet pipe.

SEE OR SEARCH THIS CLASS, SUBCLASS:

440,	for U-shaped inlet pipes having terminal valves of this type.
592,	for distribution systems having internally extending inlet pipes, and see the search notes thereto.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclass 147 for valve mountings of the terminal type, and subclasses 318+ for reciprocating valves of this class, and see the search notes thereto.

443	.... Horizontal or side entering pipe:

	This subclass is indented under subclass 442. Apparatus in which the inlet pipe is horizontal or enters the tank holding the liquid accumulation laterally.

444	.... Vertical inlet riser:

	This subclass is indented under subclass 442. Apparatus in which the inlet pipe is vertical and enters the tank holding the liquid accumulation from the bottom thereof.

445	... With toggle or second lever connected to valve:

This subclass is indented under subclass 434. Apparatus in which there is a second lever or toggle connecting the float arm with the valve controlled thereby.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclass 75 for valve actuators of the toggle or snap acting type, and subclasses 279+ for valve actuators comprising linkage.

446	... With interposed cam, gear or threaded connection:

This subclass is indented under subclass 434. Apparatus in which the connection between the float arm and the valve controlled thereby comprises a cam or gear or a screw thread type mechanical motion.

SEE OR SEARCH THIS CLASS, SUBCLASS:

447,	for a rotary valve element screw threaded to the float arm, no motion of the valve relative to the valve casing resulting from the screw arrangement.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclasses 213+ for mechanical movement valve actuators.

447	... Rotary valve element:

This subclass is indented under subclass 434. Apparatus including a valve which rotates on its axis to control the valve part or parts and is connected to the float arm for operation thereby.

SEE OR SEARCH THIS CLASS, SUBCLASS:

446,	for valves which rotate only as a means to secure longitudinal valving motion of the valve as by a screw type mechanical movement.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclasses 304+ for rotary valves, per se.

448	... Pivoted valve:

This subclass is indented under subclass 434. Apparatus in which the valve controlled by the float arm is pivoted to swing about an axis for controlling the fluid flow.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclass 84 for valve heads which are movably connected to their stem or actuator for accommodation to their seats, and subclasses 298+ for pivoted valves.

449	... Ball valves:

This subclass is indented under subclass 434. Apparatus in which the valve controlled by the float arm is spherical in shape.

SEE OR SEARCH THIS CLASS, SUBCLASS:

539+,

for spring biased ball valves which yield to direct pressure, e.g., check or safety valves.

450	... Balanced valves:

This subclass is indented under subclass 434. Apparatus in which the valve controlled by the float arm is designed in such a manner that fluid pressure is exerted on opposing surfaces of the valve so that the forces acting on the valve as a result of flow or pressure in the line are neutralized or balanced, and thus a smaller force is necessary to actuate the valve.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclass 281 for balanced valves with or without actuators therefor, and see the search notes thereto.

451	... Flexible valve:

This subclass is indented under subclass 434. Apparatus in which the valve controlled by the float arm is made of or includes material which flexes during the closing action.

SEE OR SEARCH THIS CLASS, SUBCLASS:

525,	for resilient material valves of the line condition responsive type.
793+,	for diaphragms, per se, some of which constitute valve elements, and see the search notes to subclass 793.

SEE OR SEARCH CLASS:

222,	Dispensing, subclass 490 for dispenser outlets comprising slitted resilient diaphragms or nipples, and see the search notes thereto.
251,	Valves and Valve Actuation, subclasses 4+ for valves comprising flexible tubes and collapsing means therefor.

453	. Barometric:

This subclass is indented under subclass 386. Apparatus in which atmospheric pressure is utilized for maintaining a liquid level by balancing such pressure against a hydrostatic head.

SEE OR SEARCH THIS CLASS, SUBCLASS:

81,	for apparatus intended to exercise a control of fluid flow in response to variations in atmospheric pressure.
261,	for replenishment of liquid in a plurality of battery or electrolytic cells by barometric supply.
571+,	for plural tanks or compartments connected for serial flow, and see the search notes to subclass 571.

SEE OR SEARCH CLASS:

62,	Refrigeration, subclass 397 for a withdrawable liquid cooler with a barometric feed type container.
222,	Dispensing, subclasses 437 and 457 for dispensers comprising a barometric trap chamber, and see the search notes to subclass 457.

454	.. With shut-off between supply tank and receiver:

This subclass is indented under subclass 453. Apparatus which includes means for closing the fluid connection between a supply container and a receiving vessel.

(1) Note. Many of the devices classified in this subclass are provided with cut-offs which close where the connection between the supply and receiver is disassembled.

SEE OR SEARCH THIS CLASS, SUBCLASS:

320+,	for attached flow devices for tapping a source under pressure where the attachment comprises or carries means for opening a valve in the source container, which valve has no other actuator.
614.02+,	614.05, for separable, valved, flow path sections wherein at least one of the valves is operated by the act of joining or disconnecting the sections.

SEE OR SEARCH CLASS:

141,	Fluent Material Handling, With Receiver or Receiver Coacting Means, subclasses 335 , 336, 348+, and 351+ for a valved joint between a supply and a receiver, the valve being operated by the act of connecting or disconnecting them.
222,	Dispensing, subclass 165 for dispensers which have the supply container removable for refilling, and subclasses 437 and 457 for barometric type trap chamber dispensers and see the search notes to subclass 457.
251,	Valves and Valve Actuation, subclasses 89.5 and 149+ for valved pipe joints wherein the valve is operated by the coupling act.

454.2

REMOVABLE VALVE HEAD AND SEAT UNIT:

This subclass is indented under the class definition. Devices comprising one or more valve heads and their cooperating seats, with or without actuating means, formed in a sleeve, bonnet or similar structural unit which is removable as such from a valve body or housing.

SEE OR SEARCH THIS CLASS, SUBCLASS:

223+,	particularly subclass 234.5 for inflatable article valves having a removable core unit provided with a head and seat.
283+,	for removable units in hydrant valves.
315.13,	for a fluid handling system with assembling, disassembling, mounting, or removing a domestic faucet having a unitized valve head and seat.
493.1+,	512.2 and 614.19, for one valve head and seat carried by, and therefore removable with, another valve head.
515+,	for removable head and seat units in valve couplings or unions.
525.1,	for combined lip-like heads and seats.

454.4

. Pump type:

This subclass is indented under subclass 454.2. Devices which are designed to be used as inlet or outlet valves, or both, of fluid compressors or pumps.

SEE OR SEARCH CLASS:

417,	Pumps, subclass 454 for an expansible chamber type pump having means for facilitating assembly or disassembly of a pump valve to or from the pump.

454.5

. Threaded into valve casing:

	This subclass is indented under subclass 454.2. Devices in which the seat carrying portion is threadably secured in the valve casing.

454.6

. Retained by bonnet or closure:

	This subclass is indented under subclass 454.2. Devices in which the unit is retained in position by a valve bonnet or access-opening closure.

455	LINE CONDITION CHANGE RESPONSIVE VALVES:

This subclass is indented under the class definition. Apparatus in which a valve is controlled in response to a change in the fluid condition, occurring within the system or line including the valve, which change has not been effected by external means for the express purpose of controlling the operation of the valve.

(1) Note. The ultimate function of these devices is to control the flow by its own characteristics. Where the ultimate purpose of the system goes beyond this field, classification is in the subclass appropriate to the system, even though one or more line condition change responsive valves are included in it. For example, a closed circulating distribution system is classified in subclasses 563+ even if it has check valves in one of more flow passages.

SEE OR SEARCH THIS CLASS, SUBCLASS:

38+,	for gravity or inertia operated flow controllers.
47+,	for speed responsive valve control, and see the search notes to subclass 47.
59+,	for freeze condition responsive valves.
67+,	for fusible, frangible or soluble flow controllers.
78+,	for atmospheric condition change responsive valves.
154+,	for condition change responsive valves in diverse fluid containing pressure systems.
220,	for condition responsive valves of the large streamlined co-axial needle type used in hydraulic engineering, i.e., Larner-Johnson.
386+,	for liquid level responsive or maintaining systems.

SEE OR SEARCH CLASS:

181,	Acoustics, subclasses 212 and 237 for general fluid conducting and pressure relief valves.
222,	Dispensing, subclasses 491+ for dispenser outlet valves operated by pressure of the material, and see the search notes thereto.
251,	Valves and Valve Actuation, subclasses 15+ for flush type valves the closing of which is delayed by means of a pressure chamber in the line, and subclasses 25+ for fluid pressure pilot or servo operation of a valve.

456	. Safety cut-off requiring reset:

This subclass is indented under subclass 455. Apparatus in which a valve closes in response to a change in internal condition of the line fluid but does not open when the line condition returns to its previous state, the necessary reopening or resetting operation being performed by an external operator, usually manually.

SEE OR SEARCH THIS CLASS, SUBCLASS:

50,	and 57, for excess speed responsive cut-offs.
65+,	for fuel safety cut-offs responsive to combustion failure in a burner.
405,	for oil burner fuel overflow preventing safety cut-offs.
467,	for line condition change opened valves which require resetting.

SEE OR SEARCH CLASS:

141,	Fluent Material Handling, With Receiver or Receiver Coacting Means, subclasses 198+ for cut-off valves operated by means responsive to level in a receptacle being filled, said means not including mere increase in line pressure.
251,	Valves and Valve Actuation, subclasses 15+ for valves which are opened by manual or mechanical means and closed by line fluid reaction after a predetermined flow period.

This subclass is indented under subclass 456. Apparatus in which the valve is closed in response to a change in temperature in the line.

SEE OR SEARCH THIS CLASS, SUBCLASS:

59+,	for freeze condition responsive valves.
65+,	for fuel safety cut-offs responsive to combustion failure in a burner.
72+,	for flow control devices which includes a heat fusible or destructible element for sensing the thermal condition.
79+,	for valves controlled in response to variations in atmospheric temperature.
468,	for valves operated in response to changes in thermal condition in the line but not requiring reset, and see the search notes thereto.

SEE OR SEARCH CLASS:

236,	Automatic Temperature and Humidity Regulation, appropriate subclasses, especially subclass 21 for safety cut-outs and subclass 89 for motor safety cut-outs in automatic temperature regulation.

458	.. Responsive to both high and low pressure or velocity:

This subclass is indented under subclass 456. Apparatus in which the valve member is provided with a means to close the valve in response to a predetermined low pressure or velocity of line fluid at a point in the line, and also with means to close the valve in response to a predetermined high internal pressure or velocity occurring in the line.

SEE OR SEARCH THIS CLASS, SUBCLASS:

180,	for diverse fluid containing pressure systems in which a liquid drain is provided responsive to abnormal pressures.
493+,	for bi-directional flow responsive valves.

459	.. Responsive to change in rate of flow:

This subclass is indented under subclass 456. Apparatus which includes a mechanism which senses and is responsive to variations in the velocity of the fluid flowing through the line.

(1) Note. This subclass includes apparatus in which the sensing means is inherently responsive to fluid velocity regardless of how the sensing means is described or claimed by the inventor.

(2) Note. If a device is described as flow responsive but is equally responsive to static pressure, it is classified on the latter basis.

SEE OR SEARCH THIS CLASS, SUBCLASS:

483,	for suction flow governors with reactors sensing changes in flow or pressure differential in the line.
486,	for pilot or servo controlled valves which sense changes in flow or pressure differential in the line.
497,	for valves having a separate fluid reactor surface which responds to changes in flow or pressure differential in the line.

460	... Excessive flow cut-off:

This subclass is indented under subclass 459. Apparatus in which the valve closes in response to an increased velocity beyond a predetermined value.

(1) Note. Many of the patents classified in this subclass close in response to excess velocity occasioned by a break in the line beyond the valve.

SEE OR SEARCH THIS CLASS, SUBCLASS:

57,	for excess speed responsive valve control, and see the search notes thereto.
498,	for valves having separate reactor surfaces and closing in response to excess velocity but not requiring reset.

461	.. High pressure cut-off:

This subclass is indented under subclass 456. Apparatus in which the valve is closed in response to an increase in pressure beyond a maximum.

SEE OR SEARCH THIS CLASS, SUBCLASS:

505+,	for line condition responsive valves which have separate connected reactor surfaces and are biased open.
517+,	for line condition responsive valves of the direct acting type which are biased open.

462	.. Reset by pressure equalization valve or by-pass:

This subclass is indented under subclass 456. Apparatus in which the valve is reopened or reset by use of by-passes and/or valves which equalize the pressure on both sides of the main or cut-off valve, thereby permitting or causing the cut-off valve to open by fluid pressure alone.

SEE OR SEARCH THIS CLASS, SUBCLASS:

599.01	through 601.21, for systems dividing into parallel flow lines then recombining.
629+,	for plural valve organizations of the pressure equalization type.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclasses 281+ for balanced valves of general utility, and see the search notes thereto.

463	.. Fluid released trip:

This subclass is indented under subclass 456. Apparatus in which the valve is biased toward the closed or cut-off condition but is restrained from closing by a latch or similar means, which latch will release the valve for closing in response to a change in fluid condition within the apparatus.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclass 73 for fluid pressure trip actuation wherein the source of fluid for actuating the trip is not necessarily the line which is controlled, and see the search notes thereto.

464	.. Fluid counter-biased or unseated valve:

This subclass is indented under subclass 456. Apparatus in which the valve is urged or biased, as by gravity or a spring means, toward a closed or cut-off position and this bias is opposed by the fluid pressure within the apparatus, a lowering in the fluid pressure permitting the valve to seat or close, the arrangement being such that the valve does not return to open position on subsequent increase of fluid pressure.

SEE OR SEARCH THIS CLASS, SUBCLASS:

511+,

especially subclasses 522 to 543 for direct response valves opened by line flow and biased to closed position, where the valve shifts freely to and from closed position on change of fluid pressure condition.

465	... With mechanical stop against reopening:

This subclass is indented under subclass 464. Apparatus including a mechanical means which prevents the valve from reopening after seating or closing in the event the fluid pressure is reestablished.

(1) Note. In the valves classified herein the resetting operation must include the removal of the mechanical means from the stop position.

(2) Note. Magnetic detent is included herein.

SEE OR SEARCH THIS CLASS, SUBCLASS:

522+,

for direct response valves with external means for opposing the bias.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclasses 89+ for means for blocking or disabling an actuator for a valve which is not condition responsive.

466	... With fluid pressure seating of valve:

This subclass is indented under subclass 464. Apparatus in which the incoming pressure urges the cut-off valve toward its seat or holds it closed after the valve has closed in response to the decrease in pressure.

SEE OR SEARCH THIS CLASS, SUBCLASS:

462,	for this type of safety cut-off valves including pressure equalization valves or by-passes or venting valves for resetting the valve.

467	. Fluid opened valve requiring reset:

This subclass is indented under subclass 455. Apparatus in which a valve opens in response to a change in internal fluid condition and will not return to its closed operative position on removal of the change in condition until a closing or resetting of the valve and/or a trip device is performed by an external operator, usually manually.

SEE OR SEARCH THIS CLASS, SUBCLASS:

62,	for valve in which the valve is opened in response to a freeze condition and remains open until reset.
456+,	for valves which close in response to condition change and require resetting, and see the search notes to subclass 456.

467.5

. Consistency responsive:

This subclass is indented under subclass 455. Apparatus which responds to a change in consistency of the fluent material in the line.

SEE OR SEARCH THIS CLASS, SUBCLASS:

2+,	for processes of this type.
92,	for similar sensing means in mixture control.
109+,	particularly subclasses 115.01+ and 118.01+, for line consistency responsive control in a system which includes a constant level overflow.

468	. Thermal responsive:

This subclass is indented under subclass 455. Apparatus within ... in which a valve is controlled in response to a change in the thermal condition of the fluid within the apparatus.

(1) Note. This subclass includes devices which sense changes in thermal conditions of the fluid and exercise a compensating effect so as to neutralize any effect the change in thermal condition of the fluid would otherwise have on the operation of the device.

SEE OR SEARCH THIS CLASS, SUBCLASS:

6,	for processes of mixing controlled by heat of combustion of the mixture.
59+,	for freeze condition responsive controls.
65+,	for fuel safety cut-offs responsive to combustion failure.
72+,	for similar apparatus which includes a heat fusible or destructible element for sensing the thermal condition.
79+,	for valves controlled in response to variations in atmospheric temperature.
90,	118 and other appropriate subclasses of this group for self-proportioning systems having temperature responsive or maintaining aspects.
334+,	for systems involving heating, heat exchange and cooling, and see the search notes to subclass 334.
457,	for safety cut-off valves which respond to temperature changes in the line and require external reset.

SEE OR SEARCH CLASS:

236,	Automatic Temperature and Humidity Regulation, appropriate subclasses for thermally controlled valves, per se, especially subclasses 53 through 60for temperature responsive liquid separating traps.

469	. Pop valves:

This subclass is indented under subclass 455. Valves which are biased closed and are forced open by fluid pressure, the fluid flowing through the valve after the initial opening movement thereof acting on an auxiliary reactor surface to affect the valve opening and/or closing motion.

(1) Note. The auxiliary reactor surface may be either (a) a surface configuration of the valve sensitive to fluid flow, (b) a distinct surface affected by fluid which has passed through the valve or (c) a distinct surface located upstream of the relieved fluid flow and affected by the pressure condition created by the flow.

(2) Note. Pop relief valves are classified in this and indented subclasses.

SEE OR SEARCH THIS CLASS, SUBCLASS:

494+,	for condition responsive valves in which the initial opening movement of the valve is caused or assisted by pressure on a separate but connected reactor surface.
511+,	for condition responsive valves of the check valve type, i.e., directly responsive.

470	.. Pop closing valves:

This subclass is indented under subclass 469. Valves in which the auxiliary reactor surface aids in valve closing.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclasses 15+ for valves opened by external means with compulsory cut-off after a flow period by the effect of the flowing liquid on an auxiliary surface, and subclasses 48+ for valve actuators with dashpot or fluid controlled retarders or timers.

471	.. Pop pressure reactor in inflow to valve:

	This subclass is indented under subclass 469. Valves in which the reactor is in the inlet to the valve seat.

472	.. Pop pressure reactor in branched released path:

	This subclass is indented under subclass 469. Valves in which the fluid is released in a plurality of paths, the reactor surfaces being located in one or more of the branches.

473	... Separate relief valves or valves for each branch:

	This subclass is indented under subclass 472. Valves in which the flow in each path is initiated or controlled by a separate valve or valve area, at least one of which is of the pop reactor and/or huddling chamber type.

474	.. Lost motion between pop pressure reactor and valve:

This subclass is indented under subclass 469. Valves in which the reactor moves relative to the valve parts and is capable of motion in some part of its range without causing movement of the valve.

(1) Note. The movable reactor usually imparts a "hammer blow" to free the valve parts.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclass 76 for impact type valve actuators of general application, and see the search notes thereto, and subclasses 77+ for valves with lost motion between actuator and valve, and see the search notes to subclass 77.

475	.. Adjustable choke:

This subclass is indented under subclass 469. Valves in which the flow path giving access to the auxiliary reactor is controlled by an adjustable choke.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclasses 118+ for flow restrictors or chokes in combination with valves of general application, especially subclass 121 for the adjustable type; and see the search notes to subclass 119.

476	... Annular lip or baffle:

	This subclass is indented under subclass 475. Valves in which the adjustable member is an annular lip or baffle concentric with the valve inlet passage.

477	.... On movable valve part:

	This subclass is indented under subclass 476. Valves in which the annular adjustable lip is on a movable valve part.

478	.... Screw threaded:

	This subclass is indented under subclass 476. Valves in which the annular adjustable lip is screw threaded for axial adjustment along the valve inlet passage.

479	. Combustion engine induction type:

This subclass is indented under subclass 455. Apparatus comprising governor valves or induction controlled inlets associated with internal combustion engines, in which a valve responds to a pressure differential proportional to changes to an outlet at sub-atmospheric pressure, i.e., the induction manifold of the engine.

SEE OR SEARCH THIS CLASS, SUBCLASS:

494+,	for reactor surface controlled valves of this type controlled by super-atmospheric pressure rather than sub-atmospheric pressure.
511+,	for condition responsive valves of the direct response type, especially subclasses 517+ for direct response valves which are biased open and subclass 526 for vacuum relief type, and see the search notes to subclass 517.

480	.. Valve in auxiliary inlet to induction line:

This subclass is indented under subclass 479. Apparatus in which the valve controlled is a second or auxiliary inlet to the line-carrying the suction induced flow.

(1) Note. Many of patents classified in this subclass include valves for supplying additional fuel, air or other fluid to the flow through the intake passage of an internal combustion engine.

SEE OR SEARCH THIS CLASS, SUBCLASS:

111+,

for self-correlating branched flow systems having plural inflows, especially subclass 114 for those in which one flow supplements another.

481	.. With manual modifier:

This subclass is indented under subclass 479. Apparatus which includes a manual means which modifies the action of the valve responsive to the flow of fluid.

(1) Note. This does not include devices in which the manual or external means are mere setting or adjusting means. See section 5, of the class definition for search notes on manual actuation, resetting and adjustment of valves and valve actuators.

(2) Note. See the class definition, section 3 for search notes on plural actuators including at least one automatic actuator and section 4, for plural valves and plural nonautomatic actuators.

482	.. With suction compensator:

This subclass is indented under subclass 479. Apparatus which includes means to compensate for atmospheric pressure differential in addition to flow responsive means within the flow line.

(1) Note. The valves are usually an unbalanced butterfly with a pressure reactor in the wall of the flow line.

SEE OR SEARCH THIS CLASS, SUBCLASS:

81,	for system control responsive to changes in atmospheric pressure.
111+,	for self-controlled branched flow systems having plural inflows.
484,	for unbalanced butterfly valves without suction compensation means.

483	.. With separate reactor surface:

This subclass is indented under subclass 479. Apparatus which includes a separate reactor surface which is responsive to the pressure differential between the interior and exterior of the inlet manifold.

(1) Note. See notes to subclass 494 for definition of "separate reactor surface".

SEE OR SEARCH THIS CLASS, SUBCLASS:

494+,

for condition responsive reactor surface controlled valves of general utility. See (1 Note).

484	.. Unbalanced pivoted valve (e.g., unbalanced butterfly type):

This subclass is indented under subclass 479. Apparatus in which a biased valve having at least a flat center area is mounted in the fluid flow path and moves about a pivot located between its edges, said valve having a dynamic unbalance to fluid flow causing a torque which proportionally governs the position of the valve.

(1) Note. This subject matter comprises some modification of or addition to the conventional butterfly valve mounted at its center, designed to control or extend its quality of unbalance throughout its range of movement.

SEE OR SEARCH THIS CLASS, SUBCLASS:

482,	for similar valves with means for compensating for atmospheric pressure differential.

484.2

. Line flow effect assisted:

This subclass is indented under subclass 455. Devices in which the valve controlling forces are altered by a force resulting from a fluid pressure derived for variations in the flow of fluid in the line acting on a reactor surface other than the valve head.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclass 24 for similar structure in valves not responsive to line condition.

484.4

.. Reactor surface normal to flow:

	This subclass is indented under subclass 484.2. Devices in which the reactor surface is normal to the line flow of fluid and is in a chamber off-set from co-axial inlet and outlet flow ports so that the reactor movement is parallel to the line flow.

484.6

.. Reactor surface separated from flow by apertured partition:

This subclass is indented under subclass 484.2. Devices in which the reactor surface is in a chamber distinct from the outlet chamber and in direct fluid communication therewith by means of an aperture through a partition or wall through the chambers.

SEE OR SEARCH THIS CLASS, SUBCLASS:

505.26+,

for similar structure in reactor surface operated valves unassisted by additional line flow effect.

484.8

... Through separate aperture:

	This subclass is indented under subclass 484.6. Devices having an additional aperture for the accommodation of the valve stem.

485	. Pilot or servo controlled:

This subclass is indented under subclass 455. Apparatus within ... in which the means sensing a change in fluid condition within the apparatus controls the application of another source of power for operating the flow control valve rather than acting directly through a mechanical connection.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclasses 25+ for fluid servo-motors for nonautomatic valve operation, and see the search notes to subclass 25.

486	.. Responsive to change in rate of fluid flow:

This subclass is indented under subclass 485. Apparatus in which the valve is operated in response to the sensing of the velocity of the fluid flow or to the pressure differential along the flow line under flow condition.

(1) Note. This sensing may occur after the valve opens in response to line pressure.

SEE OR SEARCH THIS CLASS, SUBCLASS:

458,	and 459+, for flow responsive valves of the safety cut-off type.
483,	for suction flow governor valves of the combustion engine type with a reactor responsive to flow or pressure differential along the line.
497+,	for valves with separate connected fluid reactor surface sensing flow either directly or by determining pressure differential or drop along the line.

487	... Control by pressures across flow line valve:

This subclass is indented under subclass 486. Apparatus in which the flow pressure drop across the flow line valve is used to control the flow line valve pilot or servo system.

(1) Note. The main line valve serves as a variable flow line restrictor for deriving a pressure difference proportional to rate of flow.

SEE OR SEARCH THIS CLASS, SUBCLASS:

503,	for similar flow responsive means in line condition responsive valves having a reactor surface.

487.5

.. Electrically actuated valve:

This subclass is indented under subclass 485. Devices in which the valve is electrically actuated.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclasses 129+ for electrically actuated valves.

488	.. Fluid pressure type:

This subclass is indented under subclass 485. Apparatus in which the means sensing a change in fluid condition controls the effectiveness of a fluid pressure which is employed for controlling the operation of the flow controlling valve.

(1) Note. The source of fluid pressure for operating the flow controlling valve may be external or may be the main flow line.

SEE OR SEARCH THIS CLASS, SUBCLASS:

105,	for suction operated pilot controlled valves where the pilot valve is itself responsive to line suction. These are mainly milker pulsators.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclasses 25+ for fluid pressure servo type valve actuators which are operated by external means or do not include means sensing a change in fluid condition, and see the search notes to subclass 25.

489	... Choked or throttled pressure type:

This subclass is indented under subclass 488. Apparatus which includes a pressure chamber having both a valved passage and an unvalved passage for ingress and egress of fluid, the relative sizes of the passages being such that a different pressure may be maintained in the chamber when the valve passage is open than is the case when it is closed.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclasses 33+ for choked or throttled pressure type servo actuated valves which do not include means sensing a change in fluid condition in the line, and see the search notes to subclass 33.

490	.... Pilot valve within main valve head:

This subclass is indented under subclass 489. Apparatus in which the valve controlling the servo fluid pressure is physically located within the main or flow controlling valve.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclass 38 for this subject matter wherein the valve actuation is not responsive to line condition.

491	.... Choked passage through main valve head:

	This subclass is indented under subclass 489. Apparatus in which the restricted and unvalved passage passes through the main or flow controlling valve.

489.3

.... Loose fitting piston:

	This subclass is indented under subclass 489. Devices in which the unvalved passage is between the piston and the cylinder walls.

489.5

.... Pilot controls supply to pressure chamber:

	This subclass is indented under subclass 489. Devices in which the valved passage is so positioned that the pilot valve controls the ingress of the pressure fluid to the pressure chamber.

492	... Single acting fluid servo:

	This subclass is indented under subclass 488. Apparatus in which the fluid pressure servo-motor operates the flow controlling valve in one direction only, the valve being operated the other direction by a constantly acting pressure or bias.

492.5

.... Spring biased:

	This subclass is indented under subclass 492. Devices in which the constantly acting pressure or bias is a spring.

493	. Bi-directional flow valves:

This subclass is indented under subclass 455. Apparatus in which a valve means opens in response to excess pressure over a selected maximum and also opens in response to pressure below a selected minimum, usually to admit atmospheric air, or opens in response to a pressure applied to either side of the valve means.

(1) Note. The valve means may comprise a simple valve to relieve both pressure and vacuum or reverse pressure or the combination of both a valve for relieving high pressure and a valve for relieving a vacuum, or pressure on the opposite side.

SEE OR SEARCH THIS CLASS, SUBCLASS:

180,	for diverse fluid containing pressure systems having a discriminating and an abnormal pressure responsive liquid outlet.
226,	for tire inflation stems and/or chucks having plural pressure responsive valves arranged on a common axis, one opening to admit inflation fluid under pressure and the other opening to relieve excess pressure in the chuck, stem or tire.
458,	for safety cut-off valves requiring reset which are responsive to both high and low pressures or velocities.
512+,	for other plural direct response valves, especially subclass 513 for those mechanically interconnected.

493.1

.. One head and seat carried by head of another:

This subclass is indented under subclass 493. Apparatus wherein one valve head carries the head and seat of a second valve.

SEE OR SEARCH THIS CLASS, SUBCLASS:

512.2,	for other plural direct response valves having this relationship.
599.16	through 599.18, for systems dividing into parallel flow lines then recombining where the valve flow control member has a valve or valve member.
614.17,	for similar structure in serial flow valves.

493.2

... Supporting valve only spring biased:

	This subclass is indented under subclass 493.1. Apparatus wherein only the carrying valve is provided with spring biasing means.

493.3

... Supporting valve spring carried by supporting valve:

	This subclass is indented under subclass 493.1. Apparatus wherein the spring for the carried valve is mounted on the supporting valve.

493.4

.... Spring stop on supported valve stem:

	This subclass is indented under subclass 493.3. Apparatus wherein the spring of the carried valve abuts a stop (e.g., a collar) on the carried valve stem.

493.5

.... Spring abuts guide for supported valve stem:

	This subclass is indented under subclass 493.3. Apparatus wherein the spring of the carried valve abuts the guide for the stem of the carried valve.

493.6

... Both valves spring biased:

	This subclass is indented under subclass 493.1. Apparatus wherein both the carried and carrying valves are spring biased.

493.7

.. Axes of ports perpendicular:

	This subclass is indented under subclass 493. Apparatus wherein the axis of one valve port is perpendicular to the axis of the second valve port. Port as used herein is the inlet or outlet provided with the valve seat.

493.8

.. Axes of ports parallel:

	This subclass is indented under subclass 493. Apparatus wherein the axis of one valve port is parallel to the axis of the second valve port. See the definition of valve port under subclass 493.7.

493.9

.. Axes of ports co-axial:

This subclass is indented under subclass 493. Apparatus wherein the axis of one valve port is co-axial with that of the second valve port.

SEE OR SEARCH THIS CLASS, SUBCLASS:

493.1,

for coaxial ports where one valve assembly is carried by the head of another.

494	. With separate connected fluid reactor surface:

This subclass is indented under subclass 455. Apparatus in which a flow controlling valve is connected to a separate movable nonvalving surface so as to be operated thereby, the fluid flowing in the apparatus and being controlled by the valve reacting on said surface, which moves in response to variations in fluid condition in the apparatus, the motion being transmitted to the valve.

(1) Note. The separate reactor surface may be integral with the valving surface, as for example, in a valve with a surface greater than that necessary to provide its valving function, where the excess surface is subject to the pressure of the flowing material and acts as a reactor surface to operate or to assist in the operation of the valve.

(2) Note. Surfaces which are subject to the line fluid for the purpose of retarding the operation of a valve (e.g., dashpots) are not treated as separate reactor surfaces. See search notes below to subclass 514.

SEE OR SEARCH THIS CLASS, SUBCLASS:

458,	for safety cut-off valves requiring reset which are responsive to both high and low pressure or velocity.
461,	for safety cut-off valves requiring reset which are beyond a maximum.
469+,	for pop valves in which the initial flow of fluid after opening in response to fluid pressure reacts against a surface to effect the further opening or the closing operation.
479+,	for governor valves which respond proportionally to induction pressures in internal combustion engines.
511+,	for valves which respond to variations in fluid conditions acting directly on the valves, per se, especially subclass 513 for plural direct responsive valves mechanically connected, in which one valve may have an actuating effect on another, and subclass 514 for line condition direct responsive valves having dashpots using line fluid.
613+,	for distribution systems comprising plural valves arranged in series in the flow line wherein manual or external means operate one valve which causes a change in the condition in the flow line in order to utilize such changed condition to effect automatic operation of the other valve in the flow line, i.e., for systems not primarily condition change responsive, which involve such response means incidentally.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclasses 15+ for valves which are closed by fluid flow reacting means after an interval having been opened by other external means.

495	.. With manual or external control for line valve:

This subclass is indented under subclass 494. Apparatus which include in addition to the fluid actuated reactor surface, a manual or other external means for operating or for causing the operation of the same valve.

(1) Note. Modifiers, which merely vary the loading or response of the reactor surface, are not deemed to constitute manual or other external means within this definition. For such modifiers search should be made in the subclass receiving the particular type of fluid actuator. See the class definition, section 3 for search notes on plural actuators including at least one automatic actuator and section 5 for search notes on manual actuators and adjusting and resetting devices.

SEE OR SEARCH THIS CLASS, SUBCLASS:

115.01+,	for systems having a valve controlled surge relief by-pass operated by a means to sense a change in pressure (surge) in the main flow line such as may be caused by the operation of a controlling valve.
481,	for suction controlled valves which are manually modified or adjusted.
522+,	for direct response valves in combination with external means for opposing the closing bias.
613+,	for systems comprising plural valves arranged in series in the flow line wherein manual or external means operate one valve to produce a change in the condition in the flow line in order to utilize such changed condition to effect automatic operation of the other valve in the flow line.

496	.. Valve closes in responses to reverse flow:

This subclass is indented under subclass 494. Apparatus in which the flow controlling valve is disclosed or claimed as being closed in response to the reversal of the fluid flow or to its tendency toward reversal.

SEE OR SEARCH THIS CLASS, SUBCLASS:

106,	for self-controlled branched flow systems having reversing valves.
198,	for reverse flow stops in discriminating outlets for gas in diverse fluid containing pressure systems.
215+,	for back flow prevention by vacuum breaking, especially subclasses 217+ for valved air vents.
239,	for cleaning by reversing fluid flow.

497	.. Responsive to change in rate of fluid flow:

This subclass is indented under subclass 494. Apparatus in which the separate reactive surface which controls the valve is responsive to variations in the rate of flow of fluid through the apparatus or to variations in the pressure differential along the line under flow conditions.

(1) Note. If a valve is described as flow responsive but is equally responsive to static pressure, it is classified on the latter basis. Typical examples of control means responsive to changes in the rate of fluid flow are: (a) a swinging vane or turbine subject to fluid flow, (b) comparison of the pressures or pressure differences across a fixed choke in the flow line or across the throttle valve which regulates the flow; (c) comparison of the pressures or pressure differences at the throat of a Venturi and at a point upstream or downstream from such throat, (d) a deflector subject to fluid flow and movable in a straight line.

SEE OR SEARCH THIS CLASS, SUBCLASS:

10,	for processes of fluid handling control by the speed of the flow.
115.03+,	for self-controlled branch flow systems in which a by-pass or relief path is controlled by change in rate of main line flow.
220,	for Larner-Johnson type valves which are condition responsive.
459+,	for safety cut-offs responsive to changes in rate of flow and which require an external reset.
483,	for suction flow governor valves of the internal combustion engine type with a reactor responsive to changes in rate of flow or pressure differential along the line as determined under flow conditions.
486+,	for pilot or servo controlled valves responsive to variations in rate of flow or pressure differential along the line as determined under flow conditions, the pilot valves being the flow responsive member.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclasses 15+ for valves which compulsorily close after a predetermined time or quantity of flow of fluid, which flow was initiated by other means.

498	... Valve closes in response to excessive flow:

This subclass is indented under subclass 497. Apparatus in which the flow controlling valve is closed in response to an increase in the rate of flow beyond a predetermined maximum.

(1) Note. The excessive flow is usually caused by a break in the flow line.

(2) Note. The control mechanism herein, in addition to acting to close the valve in response to an excessive flow may also provide a pressure regulation in which the valve is moved toward closed position at fluid flows above normal but less than the maximum.

SEE OR SEARCH THIS CLASS, SUBCLASS:

460,	for safety cut-off valves which are responsive to excessive flow and require resetting.
499,	through 504, for fluid flow regulators in which there is not disclosure that the control valve closes in response to an excessive flow.

499	... Turbine or swinging vane type reactor:

This subclass is indented under subclass 497. Apparatus wherein the separate reactor surface is a member pivoted for oscillation or rotation, having blades, vanes or surfaces which are exposed to the fluid flow and rotating or tending to rotate the member.

SEE OR SEARCH THIS CLASS, SUBCLASS:

47+,	for speed responsive governors for valves having, as driving means for the governor, a turbine exposed to the fluid flow in a conduit, in which the turbine is not a prime mover.
332,	for valves having a nonvalving motion imparted by a turbine on the valve, as for friction reducing or antifouling purposes.

SEE OR SEARCH CLASS:

222,	Dispensing, subclasses 59+ for dispensers having cut-offs operated by rate of flow responsive means.
251,	Valves and Valve Actuation, subclasses 15+ for valves which are closed after a flow period by fluid actuated means, and subclasses 48+ for valve retarders or timers of the fluid controlled type.

500	... Expansible chamber subject to differential pressures:

This subclass is indented under subclass 497. Apparatus in which the valve is operated by a movable reaction member such as a piston or diaphragm working in an expansible chamber under the influence of two pressures taken at spaced points in the flow line which vary as a function of the rate of fluid flow through the line.

(1) Note. The movable reaction member mentioned above may be integral with the controlling valve.

SEE OR SEARCH THIS CLASS, SUBCLASS:

777+,

for expansible chamber devices, per se.

SEE OR SEARCH CLASS:

73,	Measuring and Testing, subclasses 861.42+ for pressure differential type meters.

501	.... Pressures across fixed choke:

This subclass is indented under subclass 500. Apparatus in which the pressures to which the movable reaction member is subject are taken on opposite sides of a fixed choke or flow restrictor placed in the flow line.

(1) Note. The fixed choke or flow restrictor may be adjustable, either manually or by a condition unrelated to flow in the line.

502	.... With Venturi tube having a connection to throat:

This subclass is indented under subclass 500. Apparatus in which the pressures to which the movable reaction member is subject are taken at the throat of a Venturi placed in the flow line and at another point upstream or downstream of said throat.

SEE OR SEARCH THIS CLASS, SUBCLASS:

219+,

for Larner-Johnson hydraulic valves, which are located at a point of line restriction.

SEE OR SEARCH CLASS:

73,	Measuring and Testing, subclasses 861.63+ for meters of the Venturi type.
251,	Valves and Valve Actuation, subclass 24 for fluid actuated or retarded valves with Venturi assisting means, and subclasses 123+ for a valve located at a point of restriction in the line.

503	.... Pressures across flow line valve:

This subclass is indented under subclass 500. Apparatus in which the pressures to which the movable reaction member is subject are taken on opposite sides of the throttle valve which is operated by the reaction member and which valve regulates the fluid flow.

SEE OR SEARCH THIS CLASS, SUBCLASS:

487,	for pilot or servo-controlled line condition responsive valves in which control is by differential pressures across the flow line valve.

504	... Movable deflector or choke:

This subclass is indented under subclass 497. Apparatus in which the separate reactive surface which controls the valve includes a choke, restriction, or deflector, in the fluid flow line and subject to the flow of fluid, such choke, restriction, or deflector being mounted as to be moved by the fluid proportionally to the rate of fluid flow.

SEE OR SEARCH CLASS:

138,	Pipes and Tubular Conduits, subclasses 40+ for flow restrictors in pipes, especially subclasses 43, 45 and 46 for variable restrictors.
251,	Valves and Valve Actuation, subclasses 120+ for movable or resilient guides or deflectors combined with valves.

505	.. With opening bias (e.g., pressure regulator):

This subclass is indented under subclass 494. Apparatus in which the flow controlling valve is biased toward an open position and a change in fluid condition tends to close the valve.

SEE OR SEARCH THIS CLASS, SUBCLASS:

224+,	for pressure regulators of the tire inflation type.
479+,	for biased open valves responsive to pressure differential caused by suction in a combustion engine flow line.
517+,	for biased open valves responsive to variations of the fluid pressure acting directly on the valves, and see the search notes to subclass 517.

505.11

... With relief valve:

This subclass is indented under subclass 505. Devices having a port leading from the low pressure side of the valve to waste and controlled by a normally closed pressure responsive valve.

SEE OR SEARCH THIS CLASS, SUBCLASS:

102,	for correlated supply and exhaust valves.
116.3+,	for correlated supply and by-pass or relief valves.

505.12

... Multi-stage:

This subclass is indented under subclass 505. Devices in series with another line pressure responsive valve to produce plural stage reduction.

SEE OR SEARCH THIS CLASS, SUBCLASS:

512+,

for plural serial direct response, reducing valves.

505.13

... Senses inlet pressure:

	This subclass is indented under subclass 505. Devices in which the fluid reactor surface, in communication with tie inlet side of the valve, responds to changes in inlet fluid pressure.

505.14

... Bias variable during operation:

This subclass is indented under subclass 505. Devices with means for automatically varying the opening bias on the valve, so that a variation of fluid condition through the valve (without closing the valve) may be obtained, (e.g., gas supply regulators which permit a greater flow during the high demand period).

SEE OR SEARCH THIS CLASS, SUBCLASS:

468,	for similar devices which vary the bias in response to change in thermal conditions of the fluid.
484.2,	for similar devices which vary the bias by variation of flow.

505.15

.... Ancillary reactor surface responds to inlet pressure:

	This subclass is indented under subclass 505.14. Devices in which the bias is varied by an ancillary reactor surface which responds to fluid pressure at the inlet.

505.16

.... Liquid transfer:

	This subclass is indented under subclass 505.14. Devices in which the pressure of the fluid is exerted upon the surface of a liquid free to move in such manner that fluctuations in the pressure of the fluid will transfer the liquid from one receptacle to another or from one portion of a receptacle to another portion thereof, and thereby operate the regulating valve.

505.17

.... Weight:

	This subclass is indented under subclass 505.14. Devices in which the means comprises a weight varied in accordance with the pressure of the line fluid.

505.18

... Balanced valve:

	This subclass is indented under subclass 505. Devices in which the valve is so related to the fluid controlled that the pressure bias imparted by the line pressure is balanced by means connected to but not forming a portion of the valve itself, so that the effect of line pressure tending to open or close the valve is cancelled out at least in part.

505.19

... Liquid level responsive gas flow control:

	This subclass is indented under subclass 505. Devices in which the reactor surface is a liquid transferable between plural chambers and in which the valve is actuated by means responsive to the variation of liquid level in one chamber.

505.2

... With protective separator:

This subclass is indented under subclass 505. Devices relating to the control of gas or vapor and having a distinct reactor surface chamber and connecting passage to the flow line whereby a liquid seal is provided which prevents line gas or vapor from directly contacting the reactor surface.

SEE OR SEARCH THIS CLASS, SUBCLASS:

505.19,

for liquid level type reactor surfaces which inherently protect the valve actuator.

505.21

... Main flow through isolated reactor chamber:

	This subclass is indented under subclass 505. Devices wherein the flow line comprises sequentially, the valve chamber, a flow line or passage distinct from the outlet of the valve chamber, and a remote isolated reactor surface chamber the reactor surface of which is mechanically connected to the valve.

505.22

... Through external pipe:

	This subclass is indented under subclass 505. Devices in which the pressure fluid is communicated to a chamber enclosing the reactor surface through a pipe external of the chamber.

505.23

.... Modified valve casing:

	This subclass is indented under subclass 505.22. Devices in which the valve casing is modified to receive the external pipe.

505.24

.... Adjustable external lever:

	This subclass is indented under subclass 505.22. Device in which a lever extending out of the casing provides the means of connecting the reactor and valve head, and also provides an adjustable biasing means.

505.25

... Apertured reactor surface surrounds flow line:

	This subclass is indented under subclass 505. Devices in which the flow line passes through the reactor surface.

505.26

... Reactor surface separated by apertured partition:

This subclass is indented under subclass 505. Devices in which the reactor surface is in a chamber distinct from the outlet chamber and in direct fluid communication therewith by means of an aperture through a partition or wall between the chambers.

SEE OR SEARCH THIS CLASS, SUBCLASS:

484.6+,

for similar devices, when combined with reactor chamber aspirating means.

505.27

.... In valve stem:

	This subclass is indented under subclass 505.26. Devices in which the passage to the reactor surface chamber is through the valve stem.

505.28

..... Also through reactor surface:

	This subclass is indented under subclass 505.27. Devices in which said passage further extends through the reactor surface so as to apply pressure to the rear of the reactor surface.

505.29

.... Valve stem passes through the aperture:

	This subclass is indented under subclass 505.26. Devices in which the valve stem passes through the communicating aperture.

505.3

..... Plural reactor surfaces:

	This subclass is indented under subclass 505.29. Devices wherein the reactor surface is in the form of an expansible chamber having at least two flexible walls.

505.31

..... Reactor is an inverted cup having liquid seal:

	This subclass is indented under subclass 505.29. Devices wherein the reactor surface is in the form of a bell or inverted cup floating in a liquid which forms a liquid seal for the reactor surface chamber.

505.32

...... With movement dampener:

	This subclass is indented under subclass 505.31. Devices in which the inverted cup has additional members, or is purposefully shaped, to dampen or retard its movement.

505.33

...... Valve head in inlet chamber:

	This subclass is indented under subclass 505.31. Devices in which the valve head is in the inlet chamber.

505.34

..... Valve head in inlet chamber:

	This subclass is indented under subclass 505.29. Devices in which the valve head is in the inlet chamber.

505.35

...... Rectilinear valve stem rigid with reactor surface:

	This subclass is indented under subclass 505.34. Devices in which the valve stem through the aperture is straight and rigidly joins the reactor to the valve which has at least one head in the inlet chamber.

505.36

.... Reactor surface is diaphragm:

	This subclass is indented under subclass 505.26. Devices in which the reactor surface is in the form of a flexible diaphragm.

505.37

..... With valve closing bias:

	This subclass is indented under subclass 505.36. Devices in which the valve head is provided with a bias which opposes the opening bias but is of less strength.

505.38

... Reactor surface closes chamber:

	This subclass is indented under subclass 505. Devices in which the reactor surface is in the outlet chamber and forms an imperforate wall thereof.

505.39

.... Valve head in inlet chamber:

	This subclass is indented under subclass 505.38. Devices in which the valve head is in the inlet chamber and has a stem, or connector, passing through the valve part and connected with and usually attached to, the reactor surface.

505.4

..... Reactor surface is inverted cup (float):

	This subclass is indented under subclass 505.39. Devices in which the reactor surface is a bell or inverted cup floating in a liquid seal.

505.41

..... Rectilinear valve stem rigid with reactor surface:

	This subclass is indented under subclass 505.39. Devices in which the valve stem comprises a rectilinear rod rigidly connected to the reactor surface.

505.42

..... With valve closing bias:

This subclass is indented under subclass 505.39. Devices in which the valve is urged towards its seat in opposition to the opening bias.

(1) Note. The stem is usually not attached to the reactor surface, hence a valve returning force is required when fluid pressure moves the reactor surface from the stem.

505.43

...... In reactor chamber:

	This subclass is indented under subclass 505.42. Devices in which the bias tending to close the valve is located in the reactor surface, or outlet, chamber.

505.44

.... Valve head on yoke:

	This subclass is indented under subclass 505.38. Devices in which the valve head is connected to the reactor surface by a yoke.

505.45

..... Yoke has valve closing bias:

	This subclass is indented under subclass 505.44. Devices wherein the valve is urged toward its seat in opposition to the opening bias by a force of less strength.

505.46

.... Reactor operatively connected to valve by mechanical movement:

This subclass is indented under subclass 505.38. Devices wherein a mechanical movement is interposed between the fluid pressure reactor and the valve.

SEE OR SEARCH THIS CLASS, SUBCLASS:

685,	for similar mechanical movements, and see the search notes therewith.

505.47

... With mechanical movement between actuator and valve:

This subclass is indented under subclass 505. Devices wherein a mechanical movement is interposed between the actuator and the valve.

SEE OR SEARCH THIS CLASS, SUBCLASS:

685,	for similar mechanical movements, and see the search notes therewith.

506	.. Plural valves biased closed:

This subclass is indented under subclass 494. Apparatus which include a plurality of biased closed valves responsive to variations in fluid condition, at least one of which utilizes a separate connected reactor surface.

SEE OR SEARCH THIS CLASS, SUBCLASS:

512+,	for plural line condition responsive valves of the direct response type.
631+,	for cyclic valves or closures and their actuators, and see the search notes to subclass 631.

507	.. With means for mounting or connecting to system:

This subclass is indented under subclass 494. Apparatus combined with means for mounting the apparatus on or connecting it with the system from which the apparatus derives its fluid.

(1) Note. Merely naming a conventional coupling such as an internally threaded collar is insufficient for classification in this subclass. There must be a recitation of the relationship of the mounting or connecting means to the system which is the fluid source.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclasses 143+ for mountings or supports for valves, and see the search notes to subclass 143.

508	.. Valve seat or external sleeve moves to open valve:

This subclass is indented under subclass 494. Apparatus in which the separate reactor surface comprises a movable member in which is located an orifice to be controlled, the closure for which is either fixed with respect to the valve casing, or has movement which is different from or less than the possible movement of the orifice member, whereby the controlled orifice is opened by movement of the orifice member beyond a predetermined point.

(1) Note. Certain valves included herein have a movable flow passage forming tubular member or sleeve, the end surface of which comprises a seat or passage closing part to control fluid entering the sleeve flow path, and also comprises the surface exposed to and reacting to the fluid pressure. Since these sleeves may or may not have the end surface extended by a flange or diaphragm without changing their other characteristics, all such devices have been classified together herein, regardless of the presence or absence of means to increase the exposed end area.

SEE OR SEARCH THIS CLASS, SUBCLASS:

511+,

for annular type pressure responsive valves which have an annular cooperating seat or flow passage, but which do not meet the requirements of (1) Note as to reactor surface components; i.e., the exposed surface could not be extended by enlarging the casing and increasing the area of the exposed part of the movable member.

509	.. Valve seating in direction of flow:

	This subclass is indented under subclass 494. Apparatus wherein the valve controlling the fluid flow is seated by moving in the direction of flow of the fluid.

510	... Flexible diaphragm or bellows reactor:

This subclass is indented under subclass 509. Apparatus in which the reactor includes a member having a flexible wall which is subject to the pressure of the fluid in the line.

SEE OR SEARCH THIS CLASS, SUBCLASS:

784+,	for flexible wall expansible chambers, and see the search notes thereto.
793+,	for diaphragms or bellows, per se, and see the search notes thereto.

511	. Direct response valves (i.e., check valve type):

This subclass is indented under subclass 455. Valves which are responsive to pressure of the line fluid on the face of the valve disc or plug itself.

(1) Note. Since they have no other actuator, their movement from a normal or neutral or biased position is caused solely by change in the fluid flow or pressure in the line, and they return to their original position when the original condition is restored.

(2) Note. Mere check valves are included in this group of subclasses, but a system which is not primarily condition change responsive is not classified herein merely because it includes one or more check valves. Instead, it is placed in a subclass appropriate to the system claimed.

SEE OR SEARCH THIS CLASS, SUBCLASS:

315.33,	for a check valve (e.g., non-return valve, etc.) with assembling or disassembling means.
508,	for valves in which a tubular passage forming member moves in response to pressure of the line fluid and is biased closed, the tubular member having an exposed end comprising a separate reactor surface.
599.18,	for systems dividing into parallel flow lines then recombining having a direct response valve (i.e., check valve).

SEE OR SEARCH CLASS:

222,	Dispensing, subclasses 490 and 491+ for dispenser outlet elements operated by pressure of the contents.
251,	Valves and Valve Actuation, appropriate subclasses for valves which have motor, mechanical, fluid pressure or manual means for opening or closing, but are biased to the other position by springs, weights, internal fluid pressure, etc., particularly. See (1) Note above. See also subclasses 336+ for biased valves, per se, and see the search notes to subclass 336.

This subclass is indented under subclass 511. Apparatus including more than one valve of the type.

(1) Note. See the class definition, section 3 for search notes on plural automatic valves.

SEE OR SEARCH THIS CLASS, SUBCLASS:

247.17,	for plural direct response valves combined with liquid seal means.
506+,	for plural line condition responsive valves including at least one valve which has a separate connected fluid reactor surface.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclasses 631+ for cyclic valves and their actuators, and see the search notes to subclass 631.

512.1

... Dividing and recombining in a single flow path:

This subclass is indented under subclass 512. Devices in which the valves are arranged in a single flow path and divide the flow into parallel paths which recombine after passing through the valves.

SEE OR SEARCH THIS CLASS, SUBCLASS:

516.11,	for dividing and recombining effected by plural ports in a seat and a single valve head.
599.11	through 599.15, for systems dividing into parallel flow lines then recombining having a bypass.

512.15

.... Integral resilient member forms plural valves:

This subclass is indented under subclass 512.1. Valves controlled by an integral resilient member mounted so that portions of the said member provide separate valve heads.

SEE OR SEARCH THIS CLASS, SUBCLASS:

512.4,

for other plural direct response valves provided by an integral resilient member.

512.2

... One valve carries head and seat for second valve:

This subclass is indented under subclass 512. Devices in which one of the valves carries the seat for at least one other valve and also serves as the support for the other valve.

SEE OR SEARCH THIS CLASS, SUBCLASS:

493.1,	for bi-directional flow valves of this type.
599.16	through 599.18, for systems dividing into parallel flow lines then recombining where the valve flow control member having a valve or valve member.

512.3

... Diverse types:

	This subclass is indented under subclass 512. Devices in which the valves are of different types, e.g., disc valves and ball valves, or are of different size so that they operate at different pressures.

512.4

... Integral resilient member forms plural valves:

This subclass is indented under subclass 512. Devices in which the valves are integral resilient members which are attached to the valve body in such a manner as to provide separately operating resilient portions which control separate ports in the valve body.

SEE OR SEARCH THIS CLASS, SUBCLASS:

512.15,	for plural direct response valves provided by an integral resilient member characterized by dividing and recombining in a single flow path.
525,	for single valves of this type.

512.5

... With common biasing means:

	This subclass is indented under subclass 512. Devices in which the valves are urged toward or away from their seats by the same biasing means.

513	... Mechanically interconnected:

This subclass is indented under subclass 512. Apparatus in which there is a mechanical interconnection between two of the valves such that the movement of one valve relative to its seat in response to variation in the line condition is transmitted to the other thereby to move it relative to its seat.

SEE OR SEARCH THIS CLASS, SUBCLASS:

493+,	for valve means oppositely acting to open for either excessive pressures or pressures below standard.
494+,	for condition responsive valves having a reactor surface which is not primarily a valve, though it may have the effect of a variable restrictor.

513.3

.. With leak passage:

	This subclass is indented under subclass 511. Devices in which means are provided to permit limited flow through the valve when the valve is closed, or nominally closed.

513.5

... Permits flow at valve interface:

	This subclass is indented under subclass 513.3. Devices in which the nominally engaging surfaces of the head and/or seat elements are so constructed or arranged that when the valve is closed, a limited flow passage exists between said surfaces.

513.7

... Bypass in valve casing:

	This subclass is indented under subclass 513.3. Devices in which a passage permitting limited flow around the head and seat elements is provided in the valve body structure.

514	.. With retarder or dashpot:

This subclass is indented under subclass 511. Valves provided with a dashpot or other retarding means to prevent or reduce chattering or hunting of the valve.

SEE OR SEARCH THIS CLASS, SUBCLASS:

494+,

for valves having separate connected reacting surfaces which have a positive relation to the operation of the valve, i.e., assist in or cause either the opening or closing movement of the valve.

SEE OR SEARCH CLASS:

188,	Brakes, subclasses 297+ for a dashpot of general utility.
251,	Valves and Valve Actuation, subclasses 15+ for flow responsive valves having a timing retarding chamber to cut off flow after a predetermined flow period, subclasses 48+ for valves with fluid operated retarding means, and see the search notes to subclass 48, and subclass 64 for valve actuators with retarding means other than the fluid type.

514.3

... End of valve forms dashpot chamber:

	This subclass is indented under subclass 514. Devices wherein the end of the valve has a dashpot chamber therein.

514.5

... End of valve moves inside dashpot chamber:

	This subclass is indented under subclass 514. Devices in which the end of the valve reciprocates in a dashpot chamber.

514.7

.... Enlarged piston on end of valve stem:

	This subclass is indented under subclass 514.5. Devices wherein an enlarged member on the end of a valve stem reciprocates in a dashpot chamber.

515	.. In couplings for coaxial conduits, e.g., drill pipe check valves:

This subclass is indented under subclass 511. Valves in which the valve is associated with or mounted in a housing provided with means for joining it with pipe at both ends, the three elements being longitudinally aligned when connected.

(1) Note. Many of the patents classified in this subclass are for use in a drill string.

SEE OR SEARCH THIS CLASS, SUBCLASS:

155,	for gas lift valves for wells.

SEE OR SEARCH CLASS:

166,	Wells, subclasses 86.1+ for a well pipe having an anchor or seal with a valve, subclass 97.1 for a well cap or head with a valve, and subclasses 316+ for valves, closures, or changeable restrictors down in a well
251,	Valves and Valve Actuation, subclasses 148+ for valves contained in a pipe line or coupling, and see the search notes to subclass 148.

515.3

... Valve seat threaded into a coupling element:

This subclass is indented under subclass 515. Devices in which a separate valve seat element is threaded into one of the coupling elements

(1) Note. The valve head may be carried by the removable seat element or may be attached elsewhere in the coupling.

515.5

... Valve seat formed on or carried by a coupling element:

	This subclass is indented under subclass 515. Devices in which the valve seat element is formed as an integral part of one of the coupling elements or is separate but carried by one of the coupling elements.

515.7

... Valve seat clamped between coupling elements:

	This subclass is indented under subclass 515. Devices in which the valve seat element is clamped between separable elements of the coupling means.

516	.. With means for selecting area of valve or seat:

This subclass is indented under subclass 511. Valves provided with means for selecting one of a plurality of diverse effective areas for the valve by selecting from a plurality of preselected valve elements, i.e., from a plurality of valves or from a plurality of valve seats to vary the responsiveness of the valve.

(1) Note. The plurality of elements are usually present in the system at all times.

SEE OR SEARCH THIS CLASS, SUBCLASS:

329+,	for devices embodying a plurality of alternate wear parts, one of which may be substituted for another when required by wear or injury.
512+,	for means for varying the responsiveness of the condition response device by selecting one of plural valves of different responsiveness.
529,	for selectively usable diverse biasing means for a single condition responsive valve.

516.11

.. Single head, plural ports in parallel:

This subclass is indented under subclass 511. Valves wherein a single valve head controls a plurality of ports in a single seat, whereby the flow is subjected to an action of dividing and recombining by its flow through the seat member.

SEE OR SEARCH THIS CLASS, SUBCLASS:

512.1,

for plural direct response valves providing dividing and recombining a single flow line.

516.13

... Concentric ports:

	This subclass is indented under subclass 516.11. Valves wherein the ports are arranged concentrically.

516.15

... Annular head:

	This subclass is indented under subclass 516.11. Valves wherein the valve head is annular in form.

516.17

.... Central post on seat:

	This subclass is indented under subclass 516.15. Valves wherein the seat supports a post, the said post being substantially concentric with the annular head.

516.19

..... Stop:

	This subclass is indented under subclass 516.17. Valves wherein the post provides a valve stop or support such a stop.

516.21

...... With guide:

	This subclass is indented under subclass 516.19. Valves wherein the post also provides guide means for the valve.

516.23

..... Guide:

This subclass is indented under subclass 516.17. Valves wherein the post provides guide means for the valve head.

SEE OR SEARCH THIS CLASS, SUBCLASS:

516.21,

for guides in combination with valve stops.

516.25

.. Plural seating:

This subclass is indented under subclass 511. Valves comprising a single flow path provided with a plurality of serially arranged sealing surfaces which cooperate with a single head element.

(1) Note. A single sealing surface or head and seat interface comprises a single surface which is either planar or the resulting surface formed by the rotation of either a straight line or a smoothly curved line about the axis of the valved port.

SEE OR SEARCH THIS CLASS, SUBCLASS:

247.17,

for a plural seating valve combined with liquid seal means.

516.27

... Sequential:

	This subclass is indented under subclass 516.25. Valves wherein the seating is sequential.

516.29

.... Resilient gasket:

	This subclass is indented under subclass 516.27. Valves wherein a resilient gasket is provided at the seating surface and the deformation of the gasket provides one seating.

517	.. Biased open:

This subclass is indented under subclass 511. Valves in which a bias means is provided to maintain the valve normally open against fluid pressure on the valve itself tending to close or partly close the valve. The bias means may be the weight of the valve body itself.

SEE OR SEARCH THIS CLASS, SUBCLASS:

409+,	for normally open float valves.
479+,	for governor valves biased normally open to control the flow in a combustion engine suction line.
505+,	for valves with a separate connected fluid reactor surface in which the bias tends to open the valve.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclasses 336+ for biased valves, per se, and see the search notes to subclass 336.

518	... Oppositely swinging vanes:

This subclass is indented under subclass 517. Valves comprising a pair of edge-pivoted vanes biased in opposite directions, the pivot means comprising closely adjacent parallel axes or both vanes being pivoted on the same axis.

SEE OR SEARCH THIS CLASS, SUBCLASS:

499,	for line condition change responsive valve with a swinging vane reactor.

519	... Weight biased:

This subclass is indented under subclass 517. Valves in which the bias means is a weight which may be the weight of the valve body itself.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclass 338 for weight biases valves, per se, and see the search notes thereto.

519.5

.... Ball valves:

This subclass is indented under subclass 519. Valves wherein the moving element is substantially spherical.

SEE OR SEARCH THIS CLASS, SUBCLASS:

533.11,

for normally closed ball valves.

520	.... Edge pivoted valve:

This subclass is indented under subclass 519. Valves in which the valve body is pivoted about an axis at or closely adjacent one of its edges.

SEE OR SEARCH THIS CLASS, SUBCLASS:

247.19,	for a liquid seal combined with a pivoted valve.
521,	for other direct response pivoted valves which are biased to open position.
527,	for pivoted condition responsive valves which are biased closed.

521	... Pivoted valves:

This subclass is indented under subclass 517. Valves in which the valve body is pivotally mounted.

SEE OR SEARCH THIS CLASS, SUBCLASS:

247.19,	for a pivoted valve combined with liquid seal means.
518,	for oppositely swinging vanes comprising valve bodies.
520,	for weight biased, edge pivoted condition responsive valves.
527,	for pivoted condition responsive valves which are biased closed.

522	.. With external means for opposing bias:

This subclass is indented under subclass 511. Valves provided with means external to and independent of the flow path of the fluid controlled for opening the valve against its bias or for relieving the valve of the effect of the bias so that normal fluid pressure will open the valve.

(1) Note. The relief of bias classifiable herein is for the purpose of permitting the valve to blow off a normal pressure which the valve would otherwise contain.

(2) Note. Where a bias adjusting means positively opens the valve, classification is in this subclass.

(3) Note. See the class definition, Lines With Other Classes and Within this Class, (1) Automatic Control, and Subclass References to the Current Class, for search notes on plural valves, at least one of which is automatic.

SEE OR SEARCH THIS CLASS, SUBCLASS:

456+,	for safety cut-off valves requiring the use of external means to open them.
481,	for suction flow governor valves with manual modifier for the valve.
495,	for line condition responsive valves with separate connected fluid reactor surface and having manual or external control means.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, appropriate subclasses for valves which are regularly operated by means other then the pressure of fluid in the line, but where the fluid in the line may cause return to the original position, especially subclasses 12+ for fluid pressure actuators and retarders.

523	... With means for retaining external means in bias opposing position:

This subclass is indented under subclass 522. Valves provided with means for maintaining the bias relieving or valve opening means in the bias relieving or valve opening position.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclasses 89+ for valves with means for blocking or disabling the valve actuator, which means may hold the valve open, and see the search notes thereto.

524	.. With bias adjustment indicator:

This subclass is indented under subclass 511. Valves provided with means for indicating the adjustment of the biasing means, usually in terms of the pressure at which the valve will open.

SEE OR SEARCH THIS CLASS, SUBCLASS:

227+,	for inflation valve combinations or subcombinations provided with indicators.
551+,	for valves provided with indicating means, especially subclass 556 for indicator elements rigidly carried by the element position of which is indicated.

SEE OR SEARCH CLASS:

116,	Signals and Indicators, subclass 227 for valve position indicators where the valve is not significantly claimed.

843	.. Resilient material valve:

This subclass is indented under subclass 511. Valve in which the valve member or the valve seat is made of resilient easily deformable material which yields in response to pressure to open the valve. The restoring force of the resilient material constitutes a major component of the biasing means.

(1) Note. The use of resilient sealing means (e.g., rubber washer) at the valve seat does not make the arrangement classifiable herein. The use of such sealing means is conventional throughout the class.

844	... Having expansible port:

	This subclass is indented under subclass 843. Valve wherein the valve member comprises a resilient body which has a passage therethrough which passage expands to an open position when fluid pressure is applied to the body and retracts upon itself into a closed position when pressure is removed to thus seal the passage against fluid flow.

845	.... Apertured plate:

	This subclass is indented under subclass 844. Valve wherein the resilient body is a substantially flat plate-like member having an expansible orifice formed therethrough.

846	.... Having exit lip:

	This subclass is indented under subclass 844. Valve wherein the resilient body has a fluid passage therethrough a portion of which is substantially nondeformable, which passage terminates in an expansible port at the point where the fluid flows from the body.

847	..... With biasing means:

	This subclass is indented under subclass 846. Valve wherein closing of the exit lip is effected or facilitated by an additional force applying means.

848	..... Side vent:

	This subclass is indented under subclass 846. Valve wherein the fluid passage is provided with a laterally disposed outlet port.

849	..... Multiple slit:

This subclass is indented under subclass 846. Valve wherein the expansible port is formed as a plurality of cuts in the resilient body.

(1) Note. The cuts may intersect one another thus forming multiple exit flaps or the cuts may be spaced from and open independently of one another.

850	..... Internally extending mount:

	This subclass is indented under subclass 846. Valve wherein the nondeformable portion of the passage has a rigid tubular supporting element inserted therein.

851	... Center flexing strip:

	This subclass is indented under subclass 843. Valve wherein the resilient material valve includes an elongated member which is confined or retained at each of its ends to thus limit deformation to its central region.

852	... With valve member flexing about securement:

	This subclass is indented under subclass 843. Valve wherein a portion of the resilient member is fixed to a substantially rigid mounting means about which at least part of the remainder of the resilient member bends or distorts towards or away from contact with a valve seat with which the resilient member coacts to produce a desired valving action upon variations in fluid pressure.

853	.... Sleeve:

	This subclass is indented under subclass 852. Valves in which the resilient member is an axially extending tubular element which flexes radially with respect to its mounting means.

854	.... Central mount:

	This subclass is indented under subclass 852. Valves in which the resilient member is secured at its center and the periphery flexes about said securement.

855	.... Flap or reed:

	This subclass is indented under subclass 852. Valve wherein the resilient member is fixed at a single location along its periphery and wherein the free portion of the member bends about this location to produce the desired valving action.

856	..... With stop:

	This subclass is indented under subclass 855. Valve wherein an abutment is located in close proximity to said resilient member to restrict the travel of said member as it moves from a closed to an open position.

857	..... With spring:

	This subclass is indented under subclass 855. Valve wherein a resilient, energy storing, bias means is provided.

858	..... With weight:

	This subclass is indented under subclass 855. Valve which, in addition to the restoring force of the resilient material is provided with a mass of material which due to the force of gravity acts to bias the resilient member towards its valve seat.

859	.... Peripherally secured diaphragm:

	This subclass is indented under subclass 852. Valve wherein said valve member is in the form of a resilient disc which is secured around its entire periphery.

860	... Annulus:

This subclass is indented under subclass 843. Valve wherein the resilient member is in the form of a ring which is carried by but not secured to a mounting and which either slides along or freely expands with respect to the mounting.

(1) Note. The ring does not need to be continuous, thus valves employing expansible or contractable split rings will be found herein.

526	.. Vacuum relief type:

This subclass is indented under subclass 511. Valves which open in response to an excessive decrease in pressure, e.g., to admit atmospheric air.

SEE OR SEARCH THIS CLASS, SUBCLASS:

217,	for back-flow prevention by vacuum breaking.
479+,	for suction flow governor valves associated with internal combustion engines.
493+,	for plural valves, one of which opens in response to excessive decrease in pressure.

527	.. Pivoted valves:

This subclass is indented under subclass 511. Valves in which the valve disc or plug swings around the means by which it is mounted in the valve seat or casing.

SEE OR SEARCH THIS CLASS, SUBCLASS:

247.19,	for a pivoted valve and liquid seal means combined.
448,	for pivoted valves operated by float drains.
484,	for unbalanced pivoted valves of the combustion engine induction type.
520,	and 521, for pivoted direct response valves which are biased open.

527.2

... Head retained by removable closure:

	This subclass is indented under subclass 527. Devices in which the valve casing is provided with a removable closure element which retains the valve head in assembled relation with its seat.

527.4

... Valve head movably connected for accommodation to seat:

	This subclass is indented under subclass 527. Devices in which the mounting of the valve permits motion of the valve head, in addition to pivoting, in order to allow the head to adjust itself to the valve seat.

527.6

... Valve mounted on end of pipe:

	This subclass is indented under subclass 527. Devices which provide means for mounting the valve on the end of a pipe.

527.8

... Weight biased:

	This subclass is indented under subclass 527. Devices which are provided with means having sufficient mass to maintain the valve in the desired position in response to gravity.

528	.. Reciprocating valves:

This subclass is indented under subclass 511. Valves in which the movable member of the valve moves substantially rectilinearly between its extreme positions. Ball valves are included although their motion may not be strictly rectilinear.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclasses 318+ for reciprocating valves of general utility, and see the search notes thereto.

529	... Plural biasing means:

This subclass is indented under subclass 528. Valves in which the biasing means comprises more than one bias force providing element exclusive of the weight of the valve body itself.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclasses 336+ for biased valves, and see the search notes to subclass 336.

530	... Cam means for adjusting and fixing bias:

This subclass is indented under subclass 528. Valves having a cam member associated with a biasing means to determine the effect of the bias.

SEE OR SEARCH THIS CLASS, SUBCLASS:

524,	for bias adjustment means and indicator for condition responsive valves.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclasses 336+ for biased valves, and see the search notes thereto.

531	... Varying effective lever arm:

This subclass is indented under subclass 528. Valves in which the bias is applied through a lever the effective length of which varies as the valve opens or closes.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclass 233 for lever actuated valves in which the leverage varies during actuation.

532	... Weight biased:

This subclass is indented under subclass 528. Valves in which the force of gravity is utilized to bias the valve.

SEE OR SEARCH THIS CLASS, SUBCLASS:

519+,

for valves of the check valve type which are weight biased to an open position.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclass 338 for valves having a mechanical actuator and weight biasing means for maintaining the valve in position.

533	.... Valve body is the weight:

	This subclass is indented under subclass 532. Valves in which the weight of the valve itself is utilized as the biasing means.

533.11

..... Ball valves:

This subclass is indented under subclass 533. Valves in which the moving element is substantially spherical.

SEE OR SEARCH THIS CLASS, SUBCLASS:

247.21,	for a ball valve combined with liquid seal means.
519.5,	for normally open ball valves.

533.13

...... Removable cage:

	This subclass is indented under subclass 533.11. Valves in which the means for controlling the movement of the valve element is separable from the valve body.

533.15

...... Separable seat:

This subclass is indented under subclass 533.11. Valves in which the valve seat is separable from the valve body.

SEE OR SEARCH THIS CLASS, SUBCLASS:

533.13,

for separable seats combined with separable ball valve cages.

533.17

..... Guided head:

	This subclass is indented under subclass 533. Devices in which means are provided to guide the head to or from its seat.

533.19

...... Cage:

	This subclass is indented under subclass 533.17. Devices in which the valve head is guided by means stationary with respect to the seat and engagable with the outer periphery of the valve head.

533.21

...... Guide stem:

	This subclass is indented under subclass 533.17. Devices in which there is provided a rod-like guiding element usually substantially smaller in diameter than the head.

533.23

....... With closing stop:

This subclass is indented under subclass 533.21. Devices in which nonvalving structure carried by the head engages a stop or abutment when the valve closes.

(1) Note. Pump valves having a resilient or deformable head or seat sealing member are found here. Valves in which the stop structure is also a nonresilient valving structure which seats in sequence with a valve having a resilient seat are found elsewhere. See Search This Class, Subclass, below.

SEE OR SEARCH THIS CLASS, SUBCLASS:

516.29,

for valves in which the stop structure is also a nonresilient valving structure which seats in sequence with a valve having a resilient seat.

533.25

....... Oppositely disposed:

	This subclass is indented under subclass 533.21. Devices in which there are a plurality of rodlike elements projecting from opposite faces of the valve head.

533.27

....... Head slidable on guide rod:

	This subclass is indented under subclass 533.21. Devices in which the valve head is apertured and slides on the stationary rod-like element extending through the aperture.

533.29

....... Guide and seat integral unit:

	This subclass is indented under subclass 533.21. Devices in which the valve seat and the guide for the rod-like element constitute a unit.

533.31

....... Guide and closure integral unit:

	This subclass is indented under subclass 533.21. Devices in which the casing closure and the guide for the rod-like element constitute a unit.

534	.... Weight coaxial with valve:

	This subclass is indented under subclass 532. Valves in which the weight is coaxial with the valve disc or plug.

535	... Spring biased:

This subclass is indented under subclass 528. Valves in which the elasticity of a resilient element is used to provide the biasing force.

SEE OR SEARCH THIS CLASS, SUBCLASS:

525,	for resilient material valves of the direct response type and see the search notes thereto.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclasses 336+ for spring biased valves of this class, and see the search notes thereto.

536	.... With means to protect spring from fluid:

This subclass is indented under subclass 535. Valves provided with means preventing or reducing the impingement of the pressure fluid on the spring, usually a flexible wall, deflecting baffles or a telescoping enclosure for the spring.

SEE OR SEARCH THIS CLASS, SUBCLASS:

790,	for expansible chamber devices with additional biasing means.
793+,	for diaphragms and bellows, per se.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclass 335.1 for valves provided with a hermetic flexible wall seal which separates the valve actuator from the controlled fluid.

537	.... Spring under tension:

This subclass is indented under subclass 535. Valves in which the resilient member is placed under tension to hold the valve normally closed.

SEE OR SEARCH CLASS:

267,	Spring Devices, subclasses 69+ for elastic extension devices, per se, especially subclasses 73+ for tension springs.

538	.... Piston-type valves:

This subclass is indented under subclass 535. Valves in which the valve is a cylindrical plug cooperating with a hollow cylindrical valve seat, there being ports in the cylindrical wall of either piston or seat which are opened and closed by reciprocating movement of the piston in the cylindrical seat.

SEE OR SEARCH THIS CLASS, SUBCLASS:

792,	for piston type expansible chamber devices.

SEE OR SEARCH CLASS:

251,	Valves and Valve Actuation, subclasses 62+ for piston type fluid pressure actuators for valves, and subclasses 318+ for reciprocating valves of this class, and see the search notes thereto.