Connection point 4-V1 pressure admitted, connection point 2-V1 vented. The working piston and the adjustment piston extend with low force and with high speed. Due to the impact pressure via 2.1-V1 valve V2 is held in its initial position. Valve V1 supplied from customer, here not displayed.
Connection point 2-V1 is pressure admitted. Connection point 4-V1 is vented. Working piston and intensifier piston move fast towards their initial position at the same time. As soon as the intensifier piston opens the hydraulic connection between the working piston and the adjustment piston, the adjustment piston is oil pressure admitted and moves together with the working piston back to their initial position.