US PATENT SUBCLASS 417 / 549
.~.~ Having separate means biasing valve closed

Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
545  DF  .~ Valved piston {7}
549.~.~ Having separate means biasing valve closed

DEFINITION

Classification: 417/549

(under subclass 545) Apparatus including means separate from the valve element and engageable therewith to continuously exert a force thereon in a direction toward its seat.

SEE OR SEARCH THIS CLASS, SUBCLASS:

507+, for a distributor which is moved by a separate fluid responsive element.