US PATENT SUBCLASS 137 / 614.13
.~.~.~ Alternately seating


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}
614.13.~.~.~ Alternately seating {1}
614.14  DF  .~.~.~.~> Biased valve


DEFINITION

Classification: 137/614.13

(under subclass 614.11) Systems wherein as one valve is moved toward its closed position, another valve is simultaneously moved toward its open position.

SEE OR SEARCH THIS CLASS, SUBCLASS:

329.1, and 329.2+, for valves having a supplementary valve which is normally held open but closes upon disassembly of the main valve to prevent loss of fluid during repair of the main valve.