US PATENT SUBCLASS 137 / 532
.~.~.~ Weight biased

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.~.~.~ Weight biased {2}
533  DF  .~.~.~.~> Valve body is the weight {2}
534  DF  .~.~.~.~> Weight coaxial with valve

DEFINITION

Classification: 137/532

(under subclass 528) Valves in which the force of gravity is utilized to bias the valve.

SEE OR SEARCH THIS CLASS, SUBCLASS:

519+, for valves of the check valve type which are weight biased to an open position.

SEE OR SEARCH CLASS

251, Valves and Valve Actuation,

338, for valves having a mechanical actuator and weight biasing means for maintaining the valve in position.