US PATENT SUBCLASS 137 / 533
.~.~.~.~ Valve body is the weight

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.~.~.~.~ Valve body is the weight {2}
533.11  DF  .~.~.~.~.~> Ball valves {2}
533.17  DF  .~.~.~.~.~> Guided head {2}

DEFINITION

Classification: 137/533

(under subclass 532) Valves in which the weight of the valve itself is utilized as the biasing means.