Self-reversing hydraulic control mechanism

Details Self-reversing hydraulic control mechanism Self-reversing hydraulic control mechanism

E - Fixed Constructions

21

B

166/27

E21B 43/18 (2006.01)

Patent

CA 1208538

TITLE SELF-REVERSING HYDRAULIC CONTROL MECHANISM ABSTRACT OF THE DISCLOSURE A self-reversing hydraulic control mechanism directs the flow of inlet and exhaust fluids into and out of a reciprocating pumping unit. The mechanism has cooperating poppet valves with fluid passages thereto disposed so that a difference in pressure between inlet and exhaust fluids exerts a holding force. This force maintains the valves in their set position until overcome by an altering force, which is developed by travel of a piston of the pumping unit.

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