Hydraulic Closed-Center System Using Fixed-Displacement Pump And Accumulator

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This system uses a small fixed hydraulic pump to charge an accumulator. When the accumulator is fully charged, an unloading valve diverts the oil to flow back to the reservoir. The oil pressure is trapped in the circuit by a check valve.

Fixed displacement pump on hydraulic closed-center circuit
Fixed displacement pump on hydraulic closed-center circuit

When the control valve is operated, an accumulator discharges its oil and actuates the cylinder. As the pressure drops the unloading valve directs the flow from the pump to charge the accumulator. This kind of system is effective when oil is needed only for a short time operation. On a function which needs a lot of oil for longer periods, it would take a very large accumulator to handle the oil flow.

 

 

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