US PATENT SUBCLASS 137 / 625.38
.~.~.~.~.~ With internal flow passage

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}
625.28  DF  .~.~ Dividing into parallel flow paths with recombining {4}
625.33  DF  .~.~.~ Reciprocating {2}
625.37  DF  .~.~.~.~ Piston {1}
625.38.~.~.~.~.~ With internal flow passage {1}
625.39  DF  .~.~.~.~.~.~> Sequential opening or closing of serial ports in single flow line

DEFINITION

Classification: 137/625.38

(under subclass 625.37) Subject matter wherein the piston provides an internal flow passage for the line fluid.

SEE OR SEARCH CLASS

251, Valves and Valve Actuation,

325, for other piston valves providing an internal flow passage.