US PATENT SUBCLASS 137 / 520
.~.~.~.~ Edge pivoted valve

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}
517  DF  .~.~ Biased open {3}
519  DF  .~.~.~ Weight biased {2}
520.~.~.~.~ Edge pivoted valve

DEFINITION

Classification: 137/520

(under subclass 519) Valves in which the valve body is pivoted about an axis at or closely adjacent one of its edges.

SEE OR SEARCH THIS CLASS, SUBCLASS:

247.19, for a liquid seal combined with a pivoted valve.

521, for other direct response pivoted valves which are biased to open position.

527, for pivoted condition responsive valves which are biased closed.