Patent ID: 8021129

Claim:
A submersible pumping system comprising: a body; a piston disposed within a cylinder, the piston translatable between an extended position and a retracted position; a pump valve in fluid communication with a fluid source, the pump valve comprising a center feed providing fluid communication between the piston chamber and the fluid source; wherein the pump valve comprises: a valve housing coupled to the body; and a valve spool comprising the center feed, wherein the center feed is partially disposed within the piston; wherein the pump valve has a first position in which the pump valve supplies an operating fluid so as to move the piston to the extended position and a second position in which the pump valve supplies the operating fluid so as to move the piston to the retracted position; an upper stop coupled to the center feed, wherein the pump valve is actuated to the first configuration when the upper stop is engaged by the piston in the retracted position; and a lower stop coupled to the center feed, wherein the pump valve is actuated to the second configuration when the lower stop is engaged by the piston in the extended position.