US PATENT SUBCLASS 137 / 629
.~.~ Pressure equalizing or auxiliary shunt flow

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

561 R  DF  SYSTEMS {32}
628  DF  .~ Sequentially progressive opening or closing of plural valves {4}
629.~.~ Pressure equalizing or auxiliary shunt flow {1}
630  DF  .~.~.~> One valve seats against other valve (e.g., concentric valves) {5}

DEFINITION

Classification: 137/629

(under subclass 628) Subject matter in which the valves are located in flow passages which are connected in parallel.

(1) Note. The effect of the prior opening of one valve may be to admit fluid pressure to the down stream side of the other valve to more nearly balance the pressure acting on the same and thus reduce the effort required to open the same.

SEE OR SEARCH THIS CLASS, SUBCLASS:

513.3, for direct response valves having a permanently open bleed port.

599+, for distribution systems involving dividing a flow path into parallel flow paths and recombining the flows, and see the search notes to subclass 599.