Patent ID: 6382243
Filing Date: 2002-05-07
Classification: F16K,G05D,Y10T

Abstract:
Pressure-reducing valve havinga valve housing (1) which has a primary pressure connection (1a) and a secondary pressure connection (1b), a first connecting duct (2) provided in the valve housing between the primary pressure connection and the secondary pressure connection, a slide (3) which is movable to and fro in the valve housing between an opening and a closing position of the first connecting duct, an operating element (4) which forces the slide into the opening position by means of a spring (5), seals (6, 7) which are provided between the valve housing and the slide and by means of which a first pressure chamber (8) is formed at one end region (3a) of the slide, a second pressure chamber (9) is formed in the central region (3b) of the slide and a third pressure chamber (10) is formed at the other end region (3c), the first and second pressure chambers (8, 9) being connected to one another in the opening position of the slide (3) by way of the first connecting duct (2), a second connecting duct (11) formed in the slide (3) and connecting the first and third pressure chambers (8, 10) to one another, a fourth pressure chamber (12) which is provided in the region of the operating element (4) and which is in operative connection with the secondary pressure connection (16) by way of a third connecting duct (13) provided in the valve housing (1), the secondary pressure prevailing in the fourth pressure chamber (12) acting on the operating element (4) against the force of the spring (5), characterised in thatthe second pressure chamber (9) in the central region (3b) of the slide is exposed to the primary pressure (P) by way of the primary pressure connection (1a), the first and third pressure chambers (8, 10) at the end regions (3a, 3c) of the slide are exposed to the secondary pressure (S) by way of the secondary pressure connection (1b), and the third and fourth pressure chambers (10, 12) are connected to one another by way of the third connecting duct (13).