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Hydraulic and Pneumatic Knowledge
Fluid Power Equipment
Fixed Displacement Pump and Accumulator Closed-Center System:
Fixed-Displacement Pump and Accumulator. In the illustration
below, shows a closed center system. In this system, a pump of small but
constant volume charges an accumulator. When an accumulator is charged to
full pressure, an unloading valve diverts the pump flow back to a reservoir. A
check valve traps the pressured oil in the circuit. When a control valve is
operated, an accumulator discharges its oil and actuates a cylinder. As pressure
begins to drop, an unloading valve directs the pump flow to an accumulator to
recharge the flow. This system, using a small capacity pump, is effective when
operating oil is needed only for a short time. However, when the functions need
a lot of oil for longer
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