A control valve for controlling a hydraulic device, the control valve comprising: 1.1 a valve housing having a longitudinal axis, an axially extending valve space, an upper side which only extends above a virtual longitudinal sectional plane extending through the valve space, and a lower side which only extends below this longitudinal sectional plane; 1.2 a valve piston which can be moved axially back and forth in the valve space between a first piston position and a second piston position; 1.3 a pressure port for supplying a pressure fluid into the valve space; 1.4 a working port for connecting the valve space to an adjusting device of the hydraulic device; 1.5 a relief port for relieving pressure on the valve space; and 1.6 an outer attaching surface for attaching the control valve to a holding structure, 1.7 wherein the pressure port, the working port and the relief port emerge at the attaching surface on the lower side of the control valve, such that the control valve can be supplied with the pressure fluid, connected to the hydraulic device and relieved of pressure via the attaching surface on the lower side, 1.8 wherein the valve piston has a first piston stay and a second piston stay at an axial distance from the first piston stay, a first end-facing surface of the first piston stay and a second end-facing surface of the second piston stay axially delineate a valve control space, and said two piston end-facing surfaces (11a, 12a) differ in size, such that the pressure fluid in the valve control space exerts a resultant axial pressure on the valve piston, 1.9 wherein in the axial portion of the valve space which the second piston stay passes over during the movements of the valve piston, a sleeve is inserted which constricts the cross-section of the valve space in the axial portion in question, characterised in that the sleeve constricts the cross-section of the valve space in the axial portion in question such that the second end-facing surface of the piston which is smaller than the opposing first end-facing surface of the piston is produced on the second piston stay in accordance with the constriction. 1.1 a valve housing having a longitudinal axis, an axially extending valve space, an upper side which only extends above a virtual longitudinal sectional plane extending through the valve space, and a lower side which only extends below this longitudinal sectional plane; 1.2 a valve piston which can be moved axially back and forth in the valve space between a first piston position and a second piston position; 1.3 a pressure port for supplying a pressure fluid into the valve space; 1.4 a working port for connecting the valve space to an adjusting device of the hydraulic device; 1.5 a relief port for relieving pressure on the valve space; and 1.6 an outer attaching surface for attaching the control valve to a holding structure, 1.7 wherein the pressure port, the working port and the relief port emerge at the attaching surface on the lower side of the control valve, such that the control valve can be supplied with the pressure fluid, connected to the hydraulic device and relieved of pressure via the attaching surface on the lower side, 1.8 wherein the valve piston has a first piston stay and a second piston stay at an axial distance from the first piston stay, a first end-facing surface of the first piston stay and a second end-facing surface of the second piston stay axially delineate a valve control space, and said two piston end-facing surfaces (11a, 12a) differ in size, such that the pressure fluid in the valve control space exerts a resultant axial pressure on the valve piston, 1.9 wherein in the axial portion of the valve space which the second piston stay passes over during the movements of the valve piston, a sleeve is inserted which constricts the cross-section of the valve space in the axial portion in question, characterised in that the sleeve constricts the cross-section of the valve space in the axial portion in question such that the second end-facing surface of the piston which is smaller than the opposing first end-facing surface of the piston is produced on the second piston stay in accordance with the constriction.