Valve for regulating fluids

A valve for controlling fluids, having a piezoelectric unit (4) for actuating a valve member (3), which is axially displaceable in a valve body (7) and with which a valve closing member (12) is associated, which valve closing member cooperates with at least one valve seat (14, 15) for opening and closing the valve (1) and separates a low-pressure region (16) at system pressure from a high-pressure region (17), the valve member (3) having at least one first piston (9) and one second piston (11) between which a hydraulic chamber (13) functioning as a tolerance compensation element and as a hydraulic booster is embodied, and to compensate for leakage losses, a filling device (23) connectable to the high-pressure region (17) is provided, characterized in that the filling device (23) is embodied with at least one channel-like hollow chamber (24, 24′), in which a solid body (25, 25′) with a gap surrounding it is disposed such that on end (25A) of the solid body (25, 25′), a line (26, 26′) leading to the high-pressure region (17) discharges into the hollow chamber (24, 24′), and on the opposite end (25B) of the solid body (25, 25′), a leakage line (27, 27′) discharges into the hollow chamber, and that a line (29, 29A, 29B, 29′) leading to the hydraulic chamber (13) branches off along the length of the solid body (25, 25′), and the system pressure (p_sys) in the hydraulic chamber (13) is adjustable by geometric definition of the branching point (28) along the length of the solid body (25, 25′).