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Hydraulic
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Fluid
Power Equipment
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 system’s relief setting.
Open-center system with a series connection
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