Patent ID: 7533695

Claim:
A control valve for a device for changing control times of an internal combustion engine, the control valve comprising: a hollow-cylindrical valve housing having an axial side and a radial side with an outer surface and an inner surface, the inner surface defining a piston movement path; a control piston positioned within the valve housing and displaceable axially in the piston movement path of the valve housing; a pressure medium connection; two operating connections; at least one radial tank connection; the two operating connections, the pressure medium connection and the at least one radial tank connection each being formed as respective radial connections on the radial side, each radial connection communicating with an interior of the valve housing via radially extending through-holes only formed in the valve housing, each through-hole of the radially extending through-holes having only two openings, a first opening of the two openings positioned at the outer surface of the valve housing and a second opening of the two openings positioned at the inner surface of the valve housing; the valve housing including an axial tank connection positioned on the axial side of the valve housing, the axial tank connection positioned on a side of the operating connections opposite from the radial tank connection, wherein the control piston is configured such that due to axial displacement of the control piston within the valve housing the control piston is positioned such that the control valve connects the two operating connections to the pressure medium connection and/or the radial tank connection, or isolates the two operating connections from both the pressure medium connection and the radial tank connection, wherein in an axial direction of the control valve, the radial connections are arranged in sequence: pressure medium connection, radial tank connection, and the two operating connections.