US PATENT SUBCLASS 137 / 878
.~.~.~ Spring bias

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  DF  .~.~ Biased valved {1}
878.~.~.~ Spring bias {3}
879  DF  .~.~.~.~> For valve having a ball head
880  DF  .~.~.~.~> With threaded actuator
881  DF  .~.~.~.~> Spring coaxial with valve {1}

DEFINITION

Classification: 137/878

Spring bias:

(under subclass 877) System wherein a resilient mass is provided to urge the flow control means to a desired position.