| 摘要 |
<p>PCT No. PCT/EP94/03147 Sec. 371 Date Mar. 5, 1996 Sec. 102(e) Date Mar. 5, 1996 PCT Filed Sep. 20, 1994 PCT Pub. No. WO95/08730 PCT Pub. Date Mar. 30, 1995A process is disclosed for switching without leaks a double seat valve comprising radial sealing elements shaped in a slide-shaped closure member (3). In order to ensure leakfree switching, in a first embodiment of the process, radial sealing elements (1, 1*) are guided and remain sealed in a cylindrical valve seat surface (5) while the valve is opened. Sealing elements (2, 2*) provided in a second closure member (4) sealingly engage an end section (E) of the radial sealing elements (1, 1*) and the end section (E) is sealing surrounded by the sealing means (2) when the valve is further opened and when it reaches its open position. In order to carry out this process, a sealing arrangement is characterized by axial sealing elements (2, 2*) that has an axial sealing surface (2a) that cooperates with an axial valve seat surface (5a), as well as radial sealing surfaces (2b) that cooperate with the end surface (E) of a sealing surface (1a) of the radial sealing elements (1, 1*), such that the radial sealing surface (2b) sealingly surrounds the end section (E) when the closure members (3, 4) engage each other.</p> |
