These valves are composed ofa solenoid operated pilot valve and a pilot operated slave valve. When a solenoid is energised the pilot valve directs the flow to move the spool of the slave valve, thus changing the direction of flow in the hydraulic circuit.

High pressure [31.5 MPa (4570 PSI)] along which high flow means compact system design.

System energy saving increased as pressure drop of each valve has been greatly reduced.