Click on the image to check the artwork
These valves are composed of a 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 High Flow: High pressure \[31.5 MPa (4570 PSI)] along which high flow means compact system design.
http://www.passca.net/