US PATENT SUBCLASS 417 / 455
.~ Having valve parts relatively moved for nonvalving function


Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
455.~ Having valve parts relatively moved for nonvalving function


DEFINITION

Classification: 417/455

(under subclass 437) Apparatus in which the means to control the pump fluid is a valve means, said valve means having parts which in addition to their relative movement for the valving function are relatively movable for a nonfluid flow controlling function.

(1) Note. The valve parts are usually to reduce static friction or cause uniform wear of a valve element and its seat.

SEE OR SEARCH CLASS

137, Fluid Handling,

330+, and the search there noted, for valves, per se, having a similar function.