US PATENT SUBCLASS 137 / 868
.~.~.~.~ Spring biased

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}
862  DF  .~.~ With common valve operator {8}
867  DF  .~.~.~ Pivoted or rotary motion converted to reciprocating valve head motion {1}
868.~.~.~.~ Spring biased

DEFINITION

Classification: 137/868

Spring biased:

(under subclass 867) System wherein a resilient mass is provided to urge either the flow control means or coordinating means to a desired position.