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Class 137 | FLUID HANDLING |
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| 1 | PROCESSES |
| 2 | With control of flow by a condition or characteristic of a fluid |
| 3 | Mixing of plural fluids of diverse characteristics or conditions |
| 4 | Controlled by consistency of mixture |
| 5 | Controlled by conductivity of mixture |
| 6 | Controlled by heat of combustion of mixture |
| 7 | Controlled by pressure |
| 8 | For producing uniform flow |
| 9 | For producing proportionate flow |
| 10 | By speed of fluid |
| 11 | For regulating boiler feed water level |
| 12 | By fluid pressure |
| 12.5 | Carbonated beverage handling processes |
| 13 | Affecting flow by the addition of material or energy |
| 14 | Involving pressure control |
| 15.01 | Cleaning, repairing, or assembling |
| 15.02 | Repairing or assembling hydrant (e.g., fireplug, etc.) |
| 15.03 | Gas or water meter repairing or assembling |
| 15.04 | Fluid cleaning or flushing |
| 15.07 | Mechanical cleaning (e.g., pig, etc.) |
| 15.08 | Repairing, securing, replacing, or servicing pipe joint, valve, or tank |
| 15.09 | Including joint or coupling |
| 15.11 | Detecting or repairing leak |
| 15.12 | Tapping pipe, keg, or tank |
| 15.16 | With content loading or unloading (e.g., dispensing, discharge assistant, etc.) |
| 15.17 | Specific valve or valve element mounting or repairing |
| 15.18 | Valve or valve element assembling, disassembling, or replacing |
| 15.1 | HIGHSPEED FLUID INTAKE MEANS (E.G., JET ENGINE INTAKE) |
| 38 | CONTROL BY CHANGE OF POSITION OR INERTIA OF SYSTEM |
| 39 | With second control |
| 40 | Position relative body of water (e.g., marine governors) |
| 43 | Vent opening or closing on tipping container |
| 44 | By shifting of liquid level |
| 45 | By pendulum or swinging member |
| 47 | SPEED RESPONSIVE VALVE CONTROL |
| 48 | Acceleration responsive valve control |
| 49 | With manual valve control |
| 50 | Speed change and excess speed valve control |
| 51 | With other condition responsive valve control |
| 53 | Centrifugal mass type (exclusive of liquid) |
| 59 | FREEZE CONDITION RESPONSIVE SAFETY SYSTEMS |
| 65 | COMBUSTION FAILURE RESPONSIVE FUEL SAFETY CUT-OFF FOR BURNERS |
| 67 | DESTRUCTIBLE OR DEFORMABLE ELEMENT CONTROLLED |
| 68.11 | Destructible element |
| 68.12 | Combined destructible and fusible element |
| 68.13 | Explosive actuation |
| 68.14 | Separable valve coupling or conduit |
| 68.16 | Tensile or sheer pin or bolt |
| 68.18 | With alarm or indicator |
| 68.19 | Rupture disc |
| 68.21 | Means for holding entire disc after rupture |
| 68.22 | Disc burst after destruction of additional element |
| 68.23 | Direct pressure causes disc to burst |
| 68.27 | Specific weakening point |
| 68.28 | Integral disc assembly |
| 68.29 | Knife or cutter causes disc to break |
| 69 | With counterbalancing element |
| 70 | Frangible element returns pressure responsive valve |
| 71 | Having pressure responsive valve |
| 72 | Heat destructible or fusible |
| 78.1 | AMBIENT CONDITION CHANGE RESPONSIVE |
| 803 | FLOW AFFECTED BY FLUID CONTACT, ENERGY FIELD OR COANDA EFFECT (E.G., PURE FLUID DEVICE OR SYSTEM) |