4/3 directional control valve symbol and working principle

3 position 4 way valve symbol or 4/3 directional control valve symbol.

• It has 4 ports/ways-P,T,A and B. P is pressure port.T is tank.A and B connected to cylinder.
• Center position is close type.
• During middle position all ports are closed.
• In right position P is connected to A and B is connected to Tank.In this position piston will move forward.
• During left position pressure connected to B and A is connected to tank.Here piston will move backward.

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