US PATENT SUBCLASS 137 / 529
.~.~.~ Plural biasing means

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}
529.~.~.~ Plural biasing means

DEFINITION

Classification: 137/529

(under subclass 528) Valves in which the biasing means comprises more than one bias force providing element exclusive of the weight of the valve body itself.

SEE OR SEARCH CLASS

251, Valves and Valve Actuation,

336+, for biased valves, and see the search notes to subclass 336.