US PATENT SUBCLASS 137 / 614.19
.~.~ Biased valve with external operator

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

561 R  DF  SYSTEMS {32}
613  DF  .~ Flow path with serial valves and/or closures {7}
614.19.~.~ Biased valve with external operator

DEFINITION

Classification: 137/614.19

(under subclass 613) Systems in which at least one of the

valves is biased by spring means, gravity or fluid pressure and which is also provided with an operator therefor which is manually actuatable from outside the system.