(under the class definition) Subject matter wherein the valve actuator is provided with means which will give the valve an accelerated or snap action during a part of its motion as compared to a relatively slow motion during another part of its motion.
(1) Note. By snap action is usually meant an arrangement wherein the actuation of the valve is first delayed while energy is stored in a spring or equivalent device and then the stored energy is released, such release taking place in a short time to provide a quick response of the actuated element.
SEE OR SEARCH THIS CLASS, SUBCLASS:
64, for valves with nonfluid timer or retarder, and see the search notes thereto for a general list of retarded valves.
66+, for biased trip type valves, including toggle type latch devices.
77+, for lost motion devices involving mere delay without a subsequent acceleration.
SEE OR SEARCH CLASS 91, Motors: Expansible Chamber Type,
344+, for cyclically operable expansible chamber motors having snap action distributing valves.
137, Fluid Handling,
469+, for pop type safety valves.
222, Dispensing,
498+, for snap acting outlet elements for dispensers.
