US PATENT SUBCLASS 417 / 261
.~.~.~ Serial interstage distributors in piston

Current as of: June, 1999
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417 /   HD   PUMPS

244  DF  SUCCESSIVE STAGES {8}
254  DF  .~ Reciprocating rigid stages {8}
259  DF  .~.~ Including valved piston {5}
261.~.~.~ Serial interstage distributors in piston

DEFINITION

Classification: 417/261

(under subclass 259) Apparatus in which the piston is provided with a plurality or relatively movable valves through which the pump fluid must flow serially enroute from one stage of pumping to the next stage of pumping.