Basic Hydraulic Open Center Series Connection System Schematic

Hydraulic and Pneumatic Knowledge
Fluid Power Equipment

Basic Hydraulic Open Center Series Connection System Schematic

Illustrated below, shows an open-center system with a series connection. Oil from a pump is routed to the three control valves in series. The return from the first valve is routed to the inlet of the second, and so on. In neutral, the oil passes through the valves in series and returns to the reservoir, as the arrows indicate. When a control valve is operated, the incoming oil is diverted to the cylinder that the valve serves. Return liquid from the cylinder is directed through the return line and on to the next valve. This system is satisfactory as long as only one valve is operating at a time. When this happens, the full output of the pump at full system pressure is available to that function. However, if more than one valve is operating, the total of the pressures required for each function cannot exceed the systems relief setting.

Open-center system with a series connection

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