Patent ID: 8789667

Claim:
An adjustable damping valve device ( 1 ) for a vibration damper, comprising: a valve body ( 35 ); a housing ( 31 ) having a stepped opening ( 33 ) in which the valve body ( 35 ) is guided so as to be axially movable by a guide sleeve ( 39 ) and a radially outwardly directed shoulder ( 43 ), wherein the valve body ( 35 ) has a pressure-loaded surface (A OED ) in a direction of a valve seat surface ( 49 ) inside a contact surface between the valve body ( 35 , 45 ) and the valve seat surface ( 49 ), the pressure loaded surface being operative in the lift direction of the valve body ( 35 , 47 ) and is impinged by damping medium from a port ( 83 ) inside a cross section limited by a valve seat surface ( 49 ), and a surface (A CloseD ) which is operative with a diameter of the guide sleeve ( 39 ) that is loaded by pressure in a closing direction formed by a back side ( 41 ) of the valve body ( 35 ); at least one valve spring ( 25 , 27 ) and an actuator ( 15 ) each configured to have respective forces that act on the valve body ( 35 , 47 ); an additional surface (A CloseD2 ) of the valve body ( 35 , 45 ) that is pressure loaded by damping medium in closing direction of the valve body ( 35 , 45 ) when the valve body ( 35 , 45 ) is impinged by damping medium flow via the port ( 83 ); said damping device ( 1 ) further comprising an emergency operation valve ( 67 ) configured so that a pressure level is at least indirectly adjustable in a control space of said damping device ( 1 ); and wherein said emergency operation valve ( 67 ) is operative only in one flow direction of said damping medium.