Patent ID: 7849825

Claim:
A control valve for a device for the variable setting of the control times of gas-exchange valves of an internal combustion engine comprising: an essentially hollow cylindrical valve housing, and a control piston displaceably arranged in the valve housing in an axial direction, two working ports and two supply ports are formed on the valve housing, each of the working ports is formed by at least one radial opening in an outer casing surface of the valve housing, the working ports are spaced apart from each other in the axial direction, at least two axial pressure medium ducts bounded opposite each other are formed on the control piston, each of the axial pressure medium ducts communicates with one of the supply ports in each position of the control piston, each of the axial pressure medium ducts is connectable to at least one of the working ports through suitable positioning of the control piston relative to the valve housing, and at least one of the axial pressure medium ducts has a non rotationally symmetric construction with respect to a longitudinal axis of the control valve.