.~ 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.
