US PATENT SUBCLASS 137 / 533.25
.~.~.~.~.~.~.~ Oppositely disposed

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}
533.25.~.~.~.~.~.~.~ Oppositely disposed

DEFINITION

Classification: 137/533.25

(under subclass 533.21) Devices in which there are a plurality of rodlike elements projecting from opposite faces of the valve head.