US PATENT SUBCLASS 251 / 325
.~.~ With internal flow passage

Current as of: June, 1999
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251 /   HD   VALVES AND VALVE ACTUATION

318  DF  RECIPROCATING VALVE {7}
324  DF  .~ Piston {1}
325.~.~ With internal flow passage

DEFINITION

Classification: 251/325

(under subclass 324) Subject matter wherein the piston provides an internal flow passage for the line fluid.

SEE OR SEARCH CLASS

137, Fluid Handling,

625.38+, for pistons providing an internal flow passage and including the feature of dividing and recombining the flow.