<p>The valve (V) has a seat valve unit (G) loaded by a valve-spring (19) against a seat (12) that is arranged between lower pressure and high-pressure sides. A damping piston (14) is fixedly connected with the seat valve unit and arranged in a low-pressure chamber (N) with the valve-spring. The damping piston works together with an inner wall of the low pressure chamber in a guiding area (16) near the seat valve unit and in another guiding area (15) that is arranged at a distance from the former area and the seat valve unit, where the spring is engaged to the piston near the former area.</p>
