Patent ID: 6595488
Filing Date: 2003-07-22
Classification: F16K

Abstract:
A butterfly valve (1) for a media under high pressure and/or at high temperature, comprising:a housing (2) provided with a passage (4) for the medium, a butterfly (6) arranged as a shut-off member within the passage (4), a shaft (10) guided at both ends in two pivot bearings (8) provided on the housing (2), the shaft (10) extending transversely through the passage (4) and being guided on one side, by an actuating end (62), out of the housing (2) to the exterior, the butterfly (6), by the shaft (10), being pivotable about an axis (Xâ€”X) of rotation in such a way that, in an opened position, a disk plane of the butterfly (6) extends approximately in a direction of the passage (4), and in a closed position, with the butterfly (6) lying transversely to the passage direction, the butterfly (6) interacts with a sealing seat (14) on the housing (2) to provide a circumferential seal, an advance bearing seal (22) being arranged in front of each of the two pivot bearings (8) on an inner side (20) thereof facing the passage (4) in such a way that an annular gap (18) surrounding the shaft (10) in a region of each respective pivot bearing (8) is sealed off against penetration of the medium from the passage (4), one advance bearing seal (22), lying remote from the actuating end (62) of the shaft (10), being axially subjected via tensioning means to provide a retensioning force so that a subsequent radial compressibility is achieved, each advance bearing seal (22) having a two-part bearing bush (24) provided with an inner bush (26) for receiving the shaft (10) therein, an outer bush (28) for receiving the inner bush (26) therein, and each advance bearing seal (22) being seated in a bearing hole (16) in the housing (2), a compressible sealing element (32) being arranged on the inner side (20) of each respective pivot bearing (8), the sealing element (32) being axially disposed between the inner bush (26) and a projecting end section (30) of the outer bush (28), so that, as a result of an axial compression of the bearing bush (24), the sealing element (32) is also radially compressed against the outer bush (28) and inwardly compressed against the shaft (10) to be compressed between the outer bush (28) and the shaft (10).