Abstract: A hydraulic oil well pumping arrangement employs a compensating type hydraulic pump, a directional valving arrangement and a proportioning valving arrangement. When the directional valve is energized, oil is directed to the rod end of the hydraulic cylinder. The rod or piston part of the hydraulic cylinder will then elevate until a first limit switch is actuated which then will de-energize the directional valve and send a current signal to the proportional valve. This current signal to the proportional valve forces it to open to a point at which the cylinder rod would extend at the desired velocity until it reaches a second limit switch. The second limit switch is near the bottom (for example, 1 foot, or 0.30 meters) of travel of the rod or piston. The current signal to the proportional valve is then decreased, creating a choking arrangement that forces the cylinder rod to decelerate. The cylinder rod then reaches another limit switch.

Abstract: A hydraulic oil well pumping arrangement employs a compensating type hydraulic pump, a directional valving arrangement and a proportioning valving arrangement. When the directional valve is energized, oil is directed to the rod end of the hydraulic cylinder. The rod or piston part of the hydraulic cylinder will then elevate until a first limit switch is actuated which then will de-energize the directional valve and send a current signal to the proportional valve. This current signal to the proportional valve forces it to open to a point at which the cylinder rod would extend at the desired velocity until it reaches a second limit switch. The second limit switch is near the bottom (for example, 1 foot, or 0.30 meters) of travel of the rod or piston. The current signal to the proportional valve is then decreased, creating a choking arrangement that forces the cylinder rod to decelerate. The cylinder rod then reaches another limit switch.

Abstract: A hydraulic oil well pumping apparatus, preferably includes a hydraulic cylinder having a rod that is movable between a upper and lower rod positions; a pumping string that extends downwardly from the rod, the string being configured to extend into an oil well for pumping oil from the well; a prime mover; a hydraulic pump that is powered by the prime mover, said pump having a compensator that regulates pump flow and pump pressure; a directional control valve that moves between open flow and closed flow positions; an accumulator in fluid communication with the pump and directional control valve; a flow line connecting the pump and the accumulator, the directional control valve being positioned in the flow line so that it can control flow between the accumulator and hydraulic cylinder; a proportioning valve; a hydraulic fluid reservoir for containing hydraulic fluid to be supplied to the hydraulic pump; a flow line that transmits hydraulic fluid from the hydraulic cylinder to the reservoir via the proportioning