US PATENT SUBCLASS 137 / 877
.~.~ Biased valved

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

561 R  DF  SYSTEMS {32}
861  DF  .~ With flow control means for branched passages {8}
877.~.~ Biased valved {1}
878  DF  .~.~.~> Spring bias {3}

DEFINITION

Classification: 137/877

Biased valve:

(under subclass 861) System in which at least one of the flow passages is provided with a fluent material flow control means which is urged by a spring, gravity, or fluid pressure means either toward or away from its seat.