| 摘要 |
The invention describes a shut-off valve having a double seat with an upper valve seat (7) of a diameter D1 and a lower valve seat (8) of a diameter D2 different to the diameter D1 (D1<D2), and a double-head setting member (12, 11, 10, 14) which in the closed condition prevents passage therethrough of a medium which is to be sealed off. The annular surface (D2-D1) of the double-head setting member (12, 11, 10, 14), which is acted upon by the medium to be sealed off and affords a closing force, and is formed from the outside diameter D2 and the inside diameter D1, is divided by a diameter D3 (D1<D3<D2) into at least two regions (10, 14) in order to distribute the closing force to the upper valve seat (7) and the lower valve seat (8).
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