US PATENT SUBCLASS 137 / 630.12
.~.~.~.~ Gate

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}
630.12.~.~.~.~ Gate

DEFINITION

Classification: 137/630.12

(under subclass 630) Systems in which at least one of the valves has a reciprocatory, rectilinear motion substantially normal to the fluid path.