US PATENT SUBCLASS 251 / 45
.~.~.~.~.~ Diaphragm or bellows surface

Current as of: June, 1999
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251 /   HD   VALVES AND VALVE ACTUATION

12  DF  FLUID ACTUATED OR RETARDED {12}
25  DF  .~ Pilot or servo type motor {8}
33  DF  .~.~ Choked pressure type servo motor {8}
43  DF  .~.~.~ Main valve biased open by line pressure {2}
44  DF  .~.~.~.~ Differential reaction surface for line pressure {1}
45.~.~.~.~.~ Diaphragm or bellows surface

DEFINITION

Classification: 251/45

(under subclass 44) Subject matter in which the differential line pressure reacting surface is a flexible wall or membrane which is deflected by the applied fluid pressure.

SEE OR SEARCH CLASS

92, Expansible Chamber Devices,

34+, for a bellows type expansible chamber device, and subclasses 90+, for a flexible wall type expansible chamber device.

137, Fluid Handling,

510, for line condition change responsive valves which have a diaphragm or bellows type separate connected reactor and seat in the direction of flow.