Piston/damper tube assembly, vibration damper and method for operating a compression stage of a vibration damper

A vibration damper comprising a piston-damper tube assembly, wherein the piston/damper tube assembly comprises:

• a piston rod;
• a damper tube that is filled at least partially with damping fluid, wherein the piston rod is movable to and fro in the damper tube, wherein the damper tube has an outer wall;
• a working piston that is movable with the piston rod, wherein by way of the working piston an interior space of the damper tube is divided into a piston rod-side working space and a working space that is remote from the piston rod, wherein the working piston has a working piston compression stage valve and a working piston rebound stage valve for flow regulation of the damping fluid between the piston rod-side working space and the working space;
• a bottom valve that closes the working space;
• and
• a compensation space disposed on the bottom valve on a side of the bottom valve that faces away from the working space, with the compensation space being filled partially with damping fluid,
• wherein the bottom valve includes a controllable 4-way bottom valve with a control member, wherein two flow passageways of the controllable 4-way bottom valve connect the working space via the control member to the compensation space, wherein two control passages of the controllable 4-way bottom valve load the control member on a first side with a pressure of the piston rod-side working space and a second side with a pressure of the compensation space, wherein a position of the control member controls the two flow passageways of the controllable 4-way bottom valve at least in a manner that is dependent on the pressure of the piston rod-side working space that prevails on the control member on the first side via a fluidic connection, and on the pressure of the compensation space that prevails on the control member on the second side via an opening.