US PATENT SUBCLASS 137 / 521
.~.~.~ Pivoted valves

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}
521.~.~.~ Pivoted valves

DEFINITION

Classification: 137/521

(under subclass 517) Valves in which the valve body is pivotally mounted.

SEE OR SEARCH THIS CLASS, SUBCLASS:

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

518, for oppositely swinging vanes comprising valve bodies.

520, for weight biased, edge pivoted condition responsive valves.

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