A piston is slidably disposed within the working chamber and divides the working chamber into an upper working chamber and a lower working chamber.

An intermediate tube is disposed around the pressure tube and the working chamber to define an intermediate chamber.

The reservoir is connected to the working chamber by at least one first connection path and the working chamber is connected to the reservoir by at least one second connection path.

The nonreturn valve (10) opens in the direction of the working space (2, 3).

A lower working area (11) close to the combustion chamber acts upon the valve member (5) in the direction of closing and an upper working area far from combustion chamber (15) acts upon it in the direction of opening.

A shaft (62) that adjoins the head (58) protrudes from the pump working chamber (30).

The valve member (56) is equipped with a head (58), on which the sealing surface (60) is configured, and is located in the pump working chamber (30).

The air pressure to the shock absorber is provided to a valve assembly which controls fluid flow between the working chamber of the shock absorber and a reserve chamber.

A shock absorber according to the present invention includes a pressure tube having a working chamber disposed therewithin.

Finally, the coupling comprises a valve arrangement which is used to influence the fluid level in the working chamber.