US PATENT SUBCLASS 137 / 628
.~ Sequentially progressive opening or closing of plural valves

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

561 R  DF  SYSTEMS {32}
628.~ Sequentially progressive opening or closing of plural valves {4}
629  DF  .~.~> Pressure equalizing or auxiliary shunt flow {1}
630.16  DF  .~.~> With subsequent closing of first opened port {1}
630.18  DF  .~.~> Screw-actuated differential valves
630.19  DF  .~.~> Lost motion {3}

DEFINITION

Classification: 137/628

(under subclass 561) Subject matter in which two or more valves are so arranged or actuated that one valve starts to open or close prior to another concurrently opening or closing valve.

SEE OR SEARCH THIS CLASS, SUBCLASS:

184, for successively opened fluid responsive valves for venting liquid in a diverse fluid containing pressure system.

625.12, for mixing valves in which sequential flow is produced by a valve unit.

SEE OR SEARCH CLASS

222, Dispensing, 486, for plural outlet valves in a dispenser having actuating means for variable operation of the valves.

251, Valves and Valve Actuation,

77+, for lost motion arrangements between a single valve and its actuator.