Hydraulic Closed-Center System Using Variable-Displacement Pump

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variable displacement pump on Hydraulic Closed-Center Circuit
Variable displacement pump on hydraulic closed center circuit

The figure above shows a closed-center system with a variable-displacement pump in the neutral mode. When the pump in neutral mode, the hydraulic oil is pumped until it reaches a predetermined pressure level. A pressure regulating valve allows the pump to shut off by itself and maintain this pressure to the valve. When the control valve is operating, the oil is flowed from the pump to the cylinder. The pressure drop causes the pump to go back to operate to pump oil to the cylinder to raise the load. When the valve returns to its neutral position, the oil is trapped on both sides of the cylinder, and the flow from the pump is blocked and rests.

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