US PATENT SUBCLASS 417 / 445
.~.~.~ Including means to open distributor in fixed chamber wall

Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
443  DF  .~ Pressure responsive distributor opened responsive to pumping member position {1}
444  DF  .~.~ Distributor in piston {1}
445.~.~.~ Including means to open distributor in fixed chamber wall

DEFINITION

Classification: 417/445

(under subclass 444) Apparatus in which the expansible chamber pump is additionally provided with valve means located within a fixed wall portion of the pump chamber forming means (e.g., cylinder), said valve means being of the type which normally opens or closes responsive to a pressure differential between the pump chamber and an inlet or discharge conduit for cyclically controlling pump fluid for the pumping operation and including means operable as a result of the pumping member being moved to a given position in the pump chamber for moving said valve to open position irrespective of said pressure differential.