(under the class definition) Subject matter wherein the valve is provided with a biasing means for urging it in one direction, a latch holds the valve against the action of the biasing means and a trip is provided for releasing the latch so that the biasing means may move the valve.
(1) Note. The latch may take the form of a collapsible
toggle.
SEE OR SEARCH THIS CLASS, SUBCLASS:
89+, for valves having means for blocking or disabling the actuator.
SEE OR SEARCH CLASS
137, Fluid Handling, 50, and 57 for trip devices which are actuated in response to excess speed of rotation of a shaft to permit a valve to open or close, subclasses 65+ for combustion failure responsive fuel safety cut-offs for burners, many of which involve trip type actuators, subclasses 67+ for destructible or deformable element control, many being biased trip devices subclass 104 for suction pulsator devices with trip linkage, subclass 417 for float controlled valves released by pilot floats, subclasses 420+ for trip mechanism in float controlled valves and subclass 456 for safety cut-offs requiring resetting, many being a trip type, especially subclass 463 for fluid released trip type safety cut-off valves requiring resetting.
