US PATENT SUBCLASS 137 / 533.23
.~.~.~.~.~.~.~ With closing stop

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

455  DF  LINE CONDITION CHANGE RESPONSIVE VALVES {11}
511  DF  .~ Direct response valves (i.e., check valve type) {14}
528  DF  .~.~ Reciprocating valves {5}
532  DF  .~.~.~ Weight biased {2}
533  DF  .~.~.~.~ Valve body is the weight {2}
533.17  DF  .~.~.~.~.~ Guided head {2}
533.21  DF  .~.~.~.~.~.~ Guide stem {5}
533.23.~.~.~.~.~.~.~ With closing stop

DEFINITION

Classification: 137/533.23

(under subclass 533.21) Devices in which nonvalving structure carried by the head engages a stop or abutment when the valve closes.

(1) Note. Pump valves having a resilient or deformable head or seat sealing member are found here. Valves in which the stop structure is also a nonresilient valving structure which seats in sequence with a valve having a resilient seat are found elsewhere. See Search This Class, Subclass, below.

SEE OR SEARCH THIS CLASS, SUBCLASS:

516.29, for valves in which the stop structure is also a nonresilient valving structure which seats in sequence with a valve having a resilient seat.