A butterfly valve for a media under high pressure and/or at high temperature including a housing provided with a passage for the medium, a butterfly arranged as a shut-off member within the passage, BUTTERFLY VALVESand a shaft guided at both ends in two pivot bearings so that the shaft extends transversely through the passage and out of the housing. The butterfly, by the shaft, is pivotable about an axis of rotation so that in an opened position, a disk plane of the butterfly extends approximately in a direction of the passage, and in a closed position, with the butterfly lying transversely to the passage direction, the butterfly interacts with a sealing seat on the housing to provide a circumferential seal.

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