US PATENT SUBCLASS 417 / 404-- .~.~.~.~.~.~ Double acting pump piston

US PATENT SUBCLASS 417 / 404
.~.~.~.~.~.~ Double acting pump piston

Current as of: June, 1999
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417 /	HD	PUMPS

321	DF	MOTOR DRIVEN {32}
375	DF	.~ Fluid motor {9}
398	DF	.~.~ Rectilinearly reciprocating cylinder and piston-type motor {1}
399	DF	.~.~.~ Rectilinearly reciprocating cylinder and piston-type pump {2}
401	DF	.~.~.~.~ Integral pump and motor pistons {2}
403	DF	.~.~.~.~.~ Double acting motor piston {1}
404		.~.~.~.~.~.~ Double acting pump piston

DEFINITION

Classification: 417/404

(under subclass 403) Apparatus in which the pump piston cooperates with a single continuous pump cylinder to divide same into a pair of opposed expansible pumping chambers, movement of said pump piston in opposite directions serving to alternately expand and contract said opposed pumping chambers, there being provided means for controlling the inlet or discharge of pumped fluid to each of said chambers which is not of the type which controls serial flow of pumped fluid from one chamber to the other.