Patent ID: 7699148

Claim:
A damping valve assembly for a vibration damper having a cylinder with an inside wall and a piston rod carrying a piston which moves in a damping medium in the cylinder, said assembly comprising: a first damping valve which, opens as the flow velocity of the damping medium in a first direction through said damping valve assembly increases; a first control slide which, with a progressive damping characteristic, can move in a closing direction to close a throttle, said control slide having a pressure-actuated surface which acts in the closing direction as a function of the flow velocity of the damping medium in the first direction through said damping valve assembly, the first damping valve and the first control slide being mounted on the piston; a piston nut, which fixes the piston to the piston rod, the control slide being supported against the piston nut; a spring which urges the control slide toward an open position and a spring carrier which carries the spring, said piston nut clamping the spring carrier and the control slide together to form a single structural unit; and a support ring, which supports the control slide axially, wherein the support ring is connected to the piston nut in a torque-transmitting manner, at least one of said support ring and piston nut having flats for engagement by a wrench.