Patent ID: 6651950
Filing Date: 2003-11-25
Classification: F02M

Abstract:
A valve for controlling fluids, having a piezoelectric unit (3) for actuating a valve member (2) which is displaceable in a bore (8) of a valve body (9) and which has at least one control piston (7) and at least one actuating piston (10) for actuating a valve closing member (9) that cooperates with at least one valve seat (19, 20), provided on the valve body (5), for opening and closing the valve (1), and having a hydraulic chamber (11), functioning as a tolerance compensation element and as a hydraulic booster, between the control piston (7) and the actuating piston (10), characterized in that the control piston (7) has a blind bore (12), open in the valve seat direction, in which the actuating piston (10) is supported displaceably, defining the hydraulic chamber (11), and a respective cross-sectional area (A0) of the control piston (7), bordering the hydraulic chamber (11), corresponds at least approximately to a smaller cross-sectional area (A0) of the actuating piston (10) together with a cross-sectional area (A2) of at least one reducing element (14), and a boost is provided such that the actuating piston (10), for at least a portion of its maximum stroke length, is displaceable in the valve seat direction, while the at least one reducing element (14) is braced on a stop (15) in the bore (8).