| 摘要 |
Shut-off valve comprising a casing which has at least two connections, one shut-off element rotatably supported in the casing having a thru bore which selectively can be aligned with the connections and an outer cylindrical surface, and a cylindrical annular sealing sleeve of elastic material which is blocked against rotation in the casing which has thru bores adapted to be aligned with the connections, the sleeve sealing by cooperating with the cylindrical surface of the shut-off element and being axially held in place at its outer edge surfaces by the casing, whereby in the outside of the sealing sleeve being made of PTFE or like material around the thru bore a groove is formed into which an elastic sealing ring is placed, the diameter of which is larger than the depth of the groove.
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