US PATENT SUBCLASS 417 / 501
.~.~ Having coextensive distributor opposite pumping member end face

Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
490  DF  .~ Pumping member position controlled port {8}
501.~.~ Having coextensive distributor opposite pumping member end face

DEFINITION

Classification: 417/501

(under subclass 490) Apparatus including a distributor positioned in facing relationship with the pumping member end face, the area of the movable portion of the distributor or the movable portion of the valve which seats on the nonmovable portion of the valve being substantially the same as the area of the pumping member end face.