US PATENT SUBCLASS 137 / 614.2
.~.~ Direct response normally closed valve limits direction of flow

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}
614.2.~.~ Direct response normally closed valve limits direction of flow

DEFINITION

Classification: 137/614.2

(under subclass 613) Systems in which at least one of the valves is of the check valve type, thereby preventing flow in one direction.