US PATENT SUBCLASS 417 / 262
.~.~.~ Valve in piston is first stage inlet valve

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}
262.~.~.~ Valve in piston is first stage inlet valve

DEFINITION

Classification: 417/262

(under subclass 259) Apparatus in which the valve in the piston is the intake valve to the first pumping unit of the series of pumping units which act on the pump fluid.