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In a 3/2-way directional control valve has a working part (A) , a pressure part (P) and a tank connection (T).
The 4/2 –way directional control valve may be applied to activate motors with either clockwise or anti-clockwise rotation.
A check valve allows flow in both directions
When reverse flow is needed during one phase of circuit operation, a pilot operated check valve can be used
Check valves/non-return valves are used to increase pressure surges which may occur in the system entering the pump.