US PATENT SUBCLASS 251 / 82
.~ Check valve with external opening and closing means

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

77  DF  LOST MOTION BETWEEN ACTUATOR AND VALVE {3}
82.~ Check valve with external opening and closing means {1}
83  DF  .~.~> Spring

DEFINITION

Classification: 251/82

(under subclass 77) Devices wherein the actuator is so connected to the valve that in its intermediate position it permits the valve to operate as a check valve and in its extreme positions it holds the valve open or closed.

SEE OR SEARCH THIS CLASS, SUBCLASS:

213+, 318+ and 336, for actuators which may contact a valve or part thereof to open or close it in opposition to its bias.