Patent ID: 6398514
Filing Date: 2002-06-04
Classification: F04B

Abstract:
A double-acting rod pump comprising:a frame support; a carriage slidably movable upon said frame support in first and opposed directions; at least one first rod pump section coupled to said carriage and said frame support; at least one second rod pump section coupled to carriage and said frame support in an operational relationship opposite to said at least one first rod pump section; a pump screw rotatably supported by said support frame; a bi-directional motor for rotating said pump screw in first and second rotational directions; engagement means on said carriage for engaging said pump screw such that first and second rotational direction rotation of said pump screw moves said carriage in opposed first and second direction movement; and valve means coupled to said at least on first rod pump section and said at least one second rod pump section for controlling fluid flow to and from said first and second rod pump sections.