Abstract: Vibration damper, including a piston rod, axially movably guided in a work cylinder, with a piston, wherein the work cylinder is closed at the end by a piston rod guide, and the vibration damper has a securing device during an assembly process so that at least a length portion of the piston rod passes through the piston rod guide. The securing device is formed by a supporting ring that is guided axially displaceably in the work cylinder and, in the fully assembled vibration damper, assumes an axial position inside the work cylinder in a length region which is delimited on one side by the piston and on the other side by a base part of the work cylinder.

Abstract: Damping valve device including a valve carrier having a circumferential annular groove in which a valve element, which can be changed in terms of diameter, forms a throttle point together with a flow guiding surface. The throttle point transitions from a through-flow position into a throttled position as a function of the flow rate of the damping medium, and at the same time the maximum widened position of the valve element which is determined by a stop is limited, the stop being designed to be adjustable.

Abstract: A spring plate arrangement for vibration damper with damper tube, with spring plate for supporting a suspension spring, the spring plate having a contact portion circumferentially contacting a circumference of the damper tube, a receiving portion adjoining the contact portion via a shoulder and radially spaced from damper tube to form an annular space, and a supporting portion adjoining receiving portion for axially supporting the suspension spring, with a retaining ring for securing spring plate at the damper tube in an axial direction AR. The damper tube has a receiving groove arranged inside the annular space and where retaining ring is received. The retaining ring has at least one radially protruding clamping contour at its circumference which cooperates with the receiving portion in an engaging manner to secure the spring plate against rotation.