Three-Way Directional Valve
A three-way directional valve consists of three ports connected through passages
within a valve body that are shown here as port A, port P and port Ex. If port A is
connected to an actuator, port P to a source of pressure and port Ex is open to
exhaust, the valve will control the flow of air to (and exhaust from) Port A.
The function of this valve is to pressurize and exhaust one actuator port. When the
spool of a three-way valve is in one extreme position, the pressure passage is
connected with the actuator passage. When in the other extreme position, the spool
connects the actuator passage with the exhaust passage.
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