.~> Check valve with external opening and closing means {1}
DEFINITION
Classification: 251/77
(under the class definition) Subject matter wherein the connection between the actuator and valve is such that during part of its valve- actuating travel the actuator or a part thereof may move without producing any movement of the valve.
(1) Note. Certain actuators wherein interruptions in the continuity of transmission of movement or energy to the valve are inherent in the law of operation of the mechanism, as in solenoids, ratchets, etc., are classified in succeeding subclasses on the basis of the particular actuator involved.
SEE OR SEARCH THIS CLASS, SUBCLASS:
75, for snap actuation mechanisms.
76, for impact actuation mechanisms.
129+, for solenoid valve actuators. See (1) Note. 157+, for lost motion connections between the actuator and the valve but also including means to increase the head and seat contact pressure operable during the period of lost motion.
230, for ratchet type mechanical movement actuators. See (1) Note.
249, for interrupted gearing mechanical movement actuators. See (1) Note.
SEE OR SEARCH CLASS
137, Fluid Handling,
243.3, for lost motion connections which permit the valve to be found on its seat, subclass 422 for lost motion in quick acting float controlled valves, subclass 474 for lost motion between a pop pressure reactor and a condition responsive valve, subclass 630.19+ for lost motion between a single actuator and a plurality of sequentially progressively operating valves.
