US PATENT SUBCLASS 417 / 456
.~ Relatively movable serial distributors


Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
456.~ Relatively movable serial distributors {2}
457  DF  .~.~> Including distributor formed by moving cylinder or liner
458  DF  .~.~> Plural pressure responsive distributors {1}


DEFINITION

Classification: 417/456

(under subclass 437) Apparatus including two or more

distributors through which the pumped fluid must pass serially in the course of flowing to the pump chamber or from the pump chamber to the point of use, each distributor having a cyclically moved flow controlling element which is capable of or constrained to move relative to the flow controlling element of another.

SEE OR SEARCH THIS CLASS, SUBCLASS:

502, for multiple cyclic outlet paths from a single pump chamber including a cyclically controlled bypass valve downstream of the discharge distributor from the chamber.