Four-Way Directional Valve
Perhaps the most common directional valve in simple pneumatic systems consists of
pressure port, two actuator ports and one or more exhaust ports. These valves are
known as four-way valves since they have four distinct flow paths or "ways" within
the valve body.
A common application of four-ported four-way directional valve is to cause
reversible motion of a cylinder or motor. To perform this function, spool connects
the pressure port with one actuator port.
At the same time, the spool connects theother actuator port with the exhaust port. This is a four-ported four-way valve.
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