US PATENT SUBCLASS 137 / 625.67
.~.~.~.~ Piston valve

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

561 R  DF  SYSTEMS {32}
625  DF  .~ Multi-way valve unit {12}
625.2  DF  .~.~ Supply and exhaust {4}
625.25  DF  .~.~.~ Reciprocating valve {3}
625.67.~.~.~.~ Piston valve {2}
625.68  DF  .~.~.~.~.~> With internal flow passage
625.69  DF  .~.~.~.~.~> With annular passage (e.g., spool)

DEFINITION

Classification: 137/625.67

(under subclass 625.25) Device wherein the valve unit is a reciprocating piston.