Patent ID: 10995533

Abstract:
A hydraulic drive for a sash of a door, a gate, a window or the like comprises a housing and a piston which is displaceably guided in the housing and which divides the interior of the housing into a pressure chamber and a non-pressurized chamber. In this case, the drive, which can in particular be a hydraulic door closer, comprises a regulating valve which is arranged on the end face of the housing delimiting the pressure chamber on the side facing away from the piston and which is integrated in particular in a housing cover for activating an impact function. The regulating valve has a valve member which is displaceable between a closed position and an open position in a valve bore of a valve housing formed in particular by the housing cover, is impinged on in the closing direction by the pressure in the pressure chamber and can be transferred into the open position thereof by the spring force of a spring unit when the pressure in the pressure chamber falls below a predeterminable limit pressure.