US PATENT SUBCLASS 417 / 314
SINGLE ACTING CHANGEABLE TO OR FROM DOUBLE ACTING


Current as of: June, 1999
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417 /   HD   PUMPS

314SINGLE ACTING CHANGEABLE TO OR FROM DOUBLE ACTING


DEFINITION

Classification: 417/314

(under the class definition) Apparatus comprising a reciprocating pumping member (e.g., piston) having opposed working faces disposed in a pair of pumping chambers, both of said chambers being effective to pump fluid under one condition of operation and means to alter the operation thereof so as to cause only one of the pumping chambers to be active during continued reciprocation of the pumping member.