US PATENT SUBCLASS 137 / 630.16
.~.~ With subsequent closing of first opened port

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}
630.16.~.~ With subsequent closing of first opened port {1}
630.17  DF  .~.~.~> Simultaneously moved port controllers

DEFINITION

Classification: 137/630.16

(under subclass 630) Systems in which, after the sequentially actuated valves are opened, the first opened valve is closed.