US PATENT SUBCLASS 137 / 614.15
.~.~.~ Opposed screw

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}
614.11  DF  .~.~ Common actuator {3}
614.15.~.~.~ Opposed screw

DEFINITION

Classification: 137/614.15

(under subclass 614.11) Systems in which the valve heads are simultaneously moved toward or away from oppositely directed seats by a common actuator through a right and left hand screw relationship.