US PATENT SUBCLASS 417 / 525
.~.~.~ Common piston includes valves for plural axially aligned chambers

Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
521  DF  .~ Plural pumping chambers {7}
523  DF  .~.~ Including valved piston {5}
525.~.~.~ Common piston includes valves for plural axially aligned chambers {2}
526  DF  .~.~.~.~> Common inlet or discharge conduit mounted on piston
527  DF  .~.~.~.~> Fluid conduit for one chamber extends through portion of another

DEFINITION

Classification: 417/525

(under subclass 523) Apparatus in which a first pumping chamber extends in a direction axially of a second pumping chamber, the piston for said first and second pumping chambers comprising a rigid unitary element, said element having valves thereon for controlling fluid to or from each of said chambers.

SEE OR SEARCH THIS CLASS, SUBCLASS:

524, for unitary or interconnected inlet or discharge distributors in a common piston for plural pumping chambers.