The valve system is the heart of every shock absorber. The proportional valves required for stepless adjustment represent the top class of this type. To this end, RAPA has developed an intelligent damper valve technology with two continuously adjustable control valves in the compression and rebound stages exclusively for the shock absorber manufacturer thyssenkrupp Bilstein – based on the know-how of its previous damper valve developments. These are responsible for regulating the damping force and work as an adjustable hydraulic bypass in the shock absorber. This enables the damper to ensure damping force adjustment according to the skyhook principle even in the high-frequency range of wheel vibrations. One valve controls the rebound stage, i.e. the force when the wheel extends, and the other controls the force in the compression stage. Within a few milliseconds, the control unit responsible for the suspension control adjusts the damping forces for each wheel individually. This increases comfort for the occupants and stabilizes the body in the best possible way. The special design of the valve ensures that the damping force is proportional to the set current. The valve-internal pressure feedback ensures superimposed pressure limitation even with highly dynamic excitations, which further increases ride comfort.