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Color Curly Brackets (indicating CPC extensions to IPC) References Date Revised

CPC
COOPERATIVE PATENT CLASSIFICATION
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PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER ; FEED-WATER SUPPLY ; CONTROLLING WATER LEVEL ; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN BOILERS ( chemical treatment of water, e.g. purification, C02F ; enclosed heat-exchange apparatus in general F28D ; controlling in general G05 )
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Feed-water heaters, i.e. economisers or like preheaters
F22D 1/003
.
{
Feed-water heater systems (F22D 1/325, F22D 1/36 and F22D 1/40 take precedence)
}
F22D 1/006
.
{
with heating tubes (F22D 1/24 takes precedence)
}
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F22D 1/02
.
with water tubes arranged in the boiler furnace, fire tubes, or flue ways (heat-exchange tubes in general F28F)
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F22D 1/04
. .
the tubes having plain outer surfaces, e.g. in vertical arrangement
F22D 1/06
. . .
in horizontal arrangement
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F22D 1/08
. .
the tubes having fins, ribs, gills, corrugations, or the like on their outer surfaces, e.g. in vertical arrangement
F22D 1/10
. . .
in horizontal arrangement (hollow fire-bars, grates, or the like used as water tubes F23H 3/02)
F22D 1/12
. .
Control devices, e.g. for regulating steam temperature
F22D 1/14
. .
Safety or venting devices (safety devices for boilers in general F22B 37/42)
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F22D 1/16
.
with water tubes arranged otherwise than in the boiler furnace, fire tubes, or flue ways
F22D 1/18
. .
and heated indirectly
F22D 1/20
. .
and directly connected to boilers
F22D 1/22
. .
and provided for rotary movements
F22D 1/24
.
with fire tubes or flue ways traversing feed-water vessels
F22D 1/26
.
with means, other than tubes, to separate water and heating medium, e.g. bulk heaters without internal flues or tubes, jacketted smoke-boxes or flue or flues
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F22D 1/28
.
for direct heat transfer, e.g. by mixing water and steam
F22D 1/30
. .
with stages, steps, baffles, dishes, circular troughs, or other means to cause interrupted or cascading fall of water (de-aeration apparatus C02F)
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F22D 1/32
.
arranged to be heated by steam, e.g. bled from turbines
F22D 1/325
. .
{
Schematic arrangements or control devices therefor
}
F22D 1/34
. .
and returning condensate to boiler with main feed supply
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F22D 1/36
.
Water and air preheating systems
F22D 1/38
. .
Constructional features of water and air preheating systems
F22D 1/40
.
Combinations of exhaust-steam and smoke-gas preheaters (for locomotives F22D 1/42)
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F22D 1/42
.
specially adapted for locomotives
F22D 1/44
. .
Smoke-gas preheaters
F22D 1/46
. .
Exhaust-steam preheaters
F22D 1/48
. .
Details
F22D 1/50
.
incorporating thermal de-aeration of feed-water (de-aeration produced in the course of direct heat transfer F22D 1/28; thermal de-aeration of water per se B01D 19/00, C02F 1/20; valves for venting F16K 24/04)
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Accumulators for preheated water
F22D 3/02
.
arranged within combustion chambers
F22D 3/04
.
combined with steam accumulators
F22D 3/06
.
directly connected to boilers
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F22D 3/08
.
specially adapted for locomotives (locomotives boilers F22B 13/06)
F22D 3/10
. .
Control devices (controlling water feed to boilers, or water level F22D 5/00)
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Controlling water feed or water level; Automatic water feeding or water-level regulators (steam traps F16T; measuring or indicating instruments G01; for indicating water level G01F; level control in general G05D 9/00)
F22D 5/02
.
with an intermediate compartment from which the water is fed by gravity after mechanically moving the compartment, the movement being controlled according to water level
F22D 5/04
.
with pivoting buckets
F22D 5/06
.
with receptacles external to, but in free communication with, the boilers and adapted to move up and down in accordance with change in water level
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F22D 5/08
.
with float-actuated valves
F22D 5/10
. .
and with pistons or membranes unitary with the feed inlet valves
F22D 5/12
. .
and with dipping tubes
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F22D 5/14
.
responsive to thermal expansion and contraction, e.g. of solid elements
F22D 5/16
. .
of fluids
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F22D 5/18
.
for varying the speed or delivery pressure of feed pumps
F22D 5/20
. .
without floats
F22D 5/22
. .
with floats
F22D 5/24
.
with electric switches
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F22D 5/26
.
Automatic feed-control systems (automatic safety devices F22B 37/42; controlling in general G05)
F22D 5/28
. .
responsive to amount of steam withdrawn; responsive to steam pressure
F22D 5/30
. .
responsive to both water level and amount of steam withdrawn or steam pressure
F22D 5/32
. .
influencing the speed or delivery pressure of the feed pumps
F22D 5/34
. .
Applications of valves (valves per se F16K)
F22D 5/36
. .
for feeding a number of steam boilers designed for different ranges of temperature and pressure
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Auxiliary devices for promoting water circulation (adaptation of boilers for promoting water circulation F22B 37/34)
F22D 7/02
.
Saddles or like directing plates fitted to furnace tubes
F22D 7/04
.
Injectors for water or steam
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F22D 7/06
.
Rotary devices, e.g. propellers
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F22D 7/08
. .
Arrangements of pumps, e.g. outside the boilers
F22D 7/10
. . .
within the boilers
F22D 7/12
.
Control devices
F22D 7/14
.
specially adapted for locomotive boilers
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Feed-water supply not provided for in other main groups
F22D 11/003
.
{
Emergency feed-water supply (safety devices for boilers in general F22B 37/42)
}
F22D 11/006
.
{
Arrangements of feedwater cleaning with a boiler
}
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F22D 11/02
.
Arrangements of feed-water pumps (F22D 11/06 takes precedence; pumps per se F04)
F22D 11/04
. .
with means to eliminate steam formation
F22D 11/06
. .
for returning condensate to boiler
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Last Modified: 10/10/2013