US PATENT SUBCLASS 417 / 507
.~ Distributor moved by separate fluid responsive surface


Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
507.~ Distributor moved by separate fluid responsive surface {1}
508  DF  .~.~> Including mechanical actuation


DEFINITION

Classification: 417/507

(under subclass 437) Apparatus in which the means to control the flow of fluid into or out of the chamber comprises a distributor, said distributor being at least partially moved cyclically by a fluid reactive surface formed on the distributor, or formed on an element adapted to contact the distributor means.

(1) Note. The reactive surface excludes the areas of the distributor means which are subjected to pump pressures as the working fluid is moved to and from the working chamber.