US PATENT SUBCLASS 251 / 15
.~ Compulsory cut-off after flow period

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

12  DF  FLUID ACTUATED OR RETARDED {12}
15.~ Compulsory cut-off after flow period {6}
16  DF  .~.~> Serial main line cut-off and manual valves (e.g., hydraulic "fuses") {1}
19  DF  .~.~> Auxiliary pilot valve overrides a first pilot valve
20  DF  .~.~> Forced return of actuator to cut-off position
21  DF  .~.~> Actuator connection released on opening of cut-off valve
22  DF  .~.~> Control fluid released into closed build-up chamber
23  DF  .~.~> Dashpot interconnects actuator and valve

DEFINITION

Classification: 251/15

(under subclass 12) Subject matter in which the flow of fluid, when established by external means under the control of the operator, is stopped after an interval of time irrespective of the continued application by the operator of the original control effect that initiated the flow.

SEE OR SEARCH THIS CLASS, SUBCLASS:

48+, for fluid actuated devices which delay closing but are not effective until the external control is released.

SEE OR SEARCH CLASS

137, Fluid Handling,

386+, for control by liquid level responsive means, i.e., by accumulated quantities in a container or a control chamber which reflects the condition in the container and subclasses 456+ for safety cut-offs which require manual resetting.

222, Dispensing, 14+, for dispenser cut-offs operated by selectively preset

volume or rate of flow responsive mechanism, and subclasses 59+ for dispenser cut-offs operated by rate of flow responsive mechanism.