(under the class definition) Subject matter wherein means are provided in connection with a detachable valve actuator, whereby a sealing member is brought into operable position to prevent leakage when the actuator is detached.
(1) Note. The arrangement herein usually takes the form of a valving means for the opening through which the actuator passes which closes the opening when the actuator is detached from the main valve.
SEE OR SEARCH THIS CLASS, SUBCLASS:
291+, for valves having detachable actuators.
335.1+, for valves having a hermetic flexible wall seal for the actuator.
SEE OR SEARCH CLASS
137, Fluid Handling, 285, for hydrants having a check valve to close the flow when the main valve is removed, subclasses 312+ for leakage or drip collectors for fluid handling devices and subclasses 613+ for serial valves in distribution systems one of which may be a repair closure for the other.
