US PATENT SUBCLASS 251 / 73
.~ Fluid pressure trip actuation


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

66  DF  BIASED TRIP {5}
73.~ Fluid pressure trip actuation


DEFINITION

Classification: 251/73

(under subclass 66) Subject matter wherein the means for actuating the trip includes fluid pressure motive means.

(1) Note. The trip may be actuated either by the application of a predetermined fluid pressure or by the decrease or failure of a fluid pressure.

(2) Note. The pressure fluid may be obtained from fuel oxidized in a chamber.

SEE OR SEARCH THIS CLASS, SUBCLASS:

12+, for fluid pressure actuated valves.

49, for dashpot type trip release in fluid actuated or retarded valves.

SEE OR SEARCH CLASS 137, Fluid Handling,

386+, and 393 for liquid level responsive devices in which a fluid pressure differential results from a vent closed by accumulated material and subclass 463 for fluid released trip type safety cut-off valves requiring resetting.

141, Fluent Material Handling, With Receiver or Receiver Coacting Means,

198+, for feed cut-off by rising liquid level in a filled receiver.