| 摘要 |
A shutoff device for shutting off liquids or gases comprises a device housing ( 10 ) and a device ( 13 ) movable in said housing ( 10 ), the device ( 13 ) being provided with an opening ( 14 ). For sealing purposes, annular sealing bodies ( 28 ) are provided which are supported in annular fluid cylinders ( 27 ). The contact surfaces ( 34 ) are coated with a hard-material layer ( 37,39 ) which is subjected to microfinishing. The sealing bodies ( 28 ) are yieldingly supported such that they are capable of following any deformation or displacement of the device ( 13 ). The sealing is particularly suitable for aggressive and abrasive media and solids-carrying media.
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