| 摘要 |
An apparatus is proposed for sealing shutoff devices located in gas or liquid transporting pipelines having a sealing arrangement, which seals the shutoff device against a casing, the sealing arrangement having a gasket engageable against the circumferential surface of the shutoff device and a seating ring supporting the gasket, and with two chambers which can be supplied in controlled manner with a pressure medium and by means of which the gasket can be raised from the circumferential surface and pressed against the latter. The sealing arrangement has a driving member (7) positively connected to the seating ring and a displaceable intermediate piston (8) located on the driving member, the first chamber (17) being located between the driving member and the intermediate piston and when subject to the action of the controlled pressure brings about a movement of the driving member in the gasket raising direction and the second chamber (16) is located between the intermediate piston and the casing (1) and when subject to the action of the controlled pressure brings about a movement of the intermediate piston in the pressing direction. Between the seating ring and the intermediate piston are located spring elements, which are biased on the pressing direction.
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