US PATENT SUBCLASS 137 / 630.13
.~.~.~.~ With balancing chamber

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  DF  .~.~ Pressure equalizing or auxiliary shunt flow {1}
630  DF  .~.~.~ One valve seats against other valve (e.g., concentric valves) {5}
630.13.~.~.~.~ With balancing chamber

DEFINITION

Classification: 137/630.13

(under subclass 630) Systems in which a pilot valve controls line pressure in a separate chamber which balances, or tends to balance the pressure differential across the second opened valve.

SEE OR SEARCH CLASS

251, Valves and Valve Actuation,

38+, for pilot valve controlled choked pressure type servo-motor valve actuators in which the pilot valve is

seated in the motor or main valve element.