US PATENT SUBCLASS 417 / 260
.~.~.~ Piston forms or carries inlet and outlet valve for one stage

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}
260.~.~.~ Piston forms or carries inlet and outlet valve for one stage

DEFINITION

Classification: 417/260

(under subclass 259) Apparatus in which the valved piston has

(1) relatively movable valve members which form, respectively, the inlet and outlet valves for one of the pumping units or (2) has a movable valve member which forms the inlet or outlet valve for one of the pumping units and the piston itself acts as the outlet or inlet valve, respectively, for said unit (e.g., piston controlled port, etc.).