US PATENT SUBCLASS 251 / 49
.~.~ Latch or trip releasing


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

12  DF  FLUID ACTUATED OR RETARDED {12}
48  DF  .~ Dashpot or fluid controlled retarder or timer {5}
49.~.~ Latch or trip releasing


DEFINITION

Classification: 251/49

(under subclass 48) Subject matter in which the fluid reaction means frees the valve from the restraining action of a catch or detent.

(1) Note. The fluid reaction means may comprise an expansible chamber, a float chamber or a gravity tank which receives a diverted portion of the flow and actuates the latch or detent, thus relating the delay or control to the duration or quantity of the flow after release of the originating force.

SEE OR SEARCH THIS CLASS, SUBCLASS:

32, for latched pilot valves.

73, for fluid pressure released trips for valves in which the fluid pressure has no relation to the duration of flow in the line. See (1) Note.

SEE OR SEARCH CLASS

137, Fluid Handling, 386+, for controls which are responsive to the level of accumulated liquid which comprises the total flow or which act to maintain the level of an accumulation of liquid. See (1) Note.