Denison Electro Hydraulic Stroker For Goldcup Series Pumps

This type of control starts the rotary input shaft by using a hydraulic spool. The zero current condition the jet pipe is focused over the two receiver orifices to construct the same amount of pressure to each receiver. The jet pipe is held down by the feedback spring from the piston and the null adjust spring that is a fit for each other. If the current is rising in a separate way that makes the jet pipe move to the right. This will increase in pressure on the right receiver and cause it to drop on the left receiver also.  As the pressures relay to one another to opposite ends of the piston it will move it and in turn will move the rotary servo thru the arm that connects the piston and rotary servo shaft. The feedback spring is adjoined to the arm that helps move it til the force tension puts it back in the center of the jet pipe. Whether  you use manual control or auto centering is needed, the servo pressure blocking valve needs to be put in the line to keep the servo pressure to the control.

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