manner the drop of the neutral pressure will be prevented because this pressure is necessary to further function of the piston of pilot valve 16 during such a movement the first piston portion 64 enters the third control chamber 54 so that the oil which was in this chamber is urged from the chamber 34 through the communication into the outlet chamber 55 during further movement of the piston of valve 16 the rod 68 with the pin 69 comes close to the ball 79 in the valve member 71 up to this moment the movement of the piston of valve 16 apart from the small resistance of the spring 63 is not subjected to any other resistance only when the first piston portion 64 interrupts the communication between the third control chamber 54 and the outlet chamber 55 the oil then must flow from the third control chamber 54 through the throttle of the relief valve 66 and the transverse passage 67 into the outlet chamber 55 then the piston of valve 16 moves slowly leftwards and the pin 69 urges the ball 79 from the second valve seat 78 so that the corresponding lowering of the user 11 starts an additional flow of the oil is created through the throttle passage 83 the fifth control chamber 82 the axial passage 81 the valve seats 77 and 78 this additional flow is created on.