Patent ID: 6530555
Filing Date: 2003-03-11
Classification: F02M

Abstract:
A valve for controlling liquids, comprising:a piezoelectric unit (3) for actuating a valve member (2), wherein said member is axially displaceable in a bore (8) of a valve body (9) and on one end has a valve closing member (13) that cooperates with at least one seat (14, 15) provided on the valve body (9), wherein a low-pressure region having a hydraulic chamber with a system pressure is dividable by the valve closing member from a high-pressure region (17), wherein a filling device (26) is provided to compensate for a leakage quantity from the hydraulic chamber of the low-pressure region (16) by drawing hydraulic liquid from the high-pressure region (17), wherein, for compensating for said leakage quantity, the filling device (26) includes a filling device conduit (27) having a throttle bore (28), wherein said throttle bore has a diameter such that a volumetric flow that passes from the high-pressure region (17) through the throttle bore (28) at a defined minimum high pressure (p_R_min) compensates the leakage quantity, wherein said throttle bore discharges into a gap surrounding the valve member, and wherein a region of the filling device conduit between the throttle bore and an end toward the gap surrounding the valve member is connected by an overpressure valve opening to the valve low-pressure chamber for setting the system pressure.