The device has a piston-shaped pressure boost element) separating a working chamber and a differential pressure chamber for connection via a control line to a high pressure source or for pressure relief in a low pressure region. The boost element has a restoring spring supported on an annular insert with a damping choke via which fuel flows from the working chamber to a hydraulic chamber when relieving the differential pressure chamber of pressure. The device has a piston-shaped pressure boost element (5) separating a working chamber (2) and a differential pressure chamber (6) for connection via a control line (7) to a high pressure source or for pressure relief in a low pressure region. The boost element has a restoring spring (13) supported on an annular insert (15) with a damping choke (24) via which fuel flows from the pressure booster's working chamber to a hydraulic chamber (22) when relieving the differential pressure chamber of pressure.
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