Patent ID: 8181757

Claim:
An adjustable damping valve comprising: a housing comprising a first valve seating surface and a second valve seating surface; a valve body in the housing, the valve body being divided axially into a first valve body assembly comprising a first control surface and a second valve body assembly comprising a second control surface and a fastening pin extending through a valve seating disk, wherein the valve seating disk is removable from the housing, and said valve body and housing defining a cross-section of a throttle therebetween; a spring acting on the valve body; an actuator configured to exert an adjusting force on the valve body against a force of the spring to influence the cross section of the throttle which determines a damping force; a main valve comprising one of the first and the second valve body assemblies configured to be coupled to a pressure space, wherein an outflow from the pressure space is varied by the throttle cross section, wherein as a throttling of the outflow decreases a pressure-dependent closing force on the one of the first and the second valve body assemblies of the main valve decreases; a separate emergency valve connected in parallel with the cross section of the throttle with respect to a flow direction of the damping medium; a pre-tensioning spring holding the valve seating disk in place against a wall of the housing, wherein when the valve body moves axially, the first control surface and the second control surface can alternately contact the first valve seating surface and the second valve seating surface, wherein the first and second valve seating surfaces are formed on the valve seating disk, and wherein the second valve body assembly determining an emergency operating mode when the second control surface contacts the second valve seating surface.