| 摘要 |
<p>1. A bufferfly valve comprising a body (1) through which extends a conduit (2) adapted to come into register with two parts of the pipeline, and a closure disc (3)-or bufferfly-mounted rotatably in the body (1) along an axis of rotation (YY') which perpendicularly intersects the axis of the conduit (2), the closure member (3) also comprising, on its surface facing the axis of rotation (YY'), at least one lug (7a) through which extends a bore (8a) coaxial with the axis of rotation (YY) and occupied by a shaft (10) which provides for rotation of the closure member (3), said lug having towards the wall of the conduit a spherical surface of a diameter close to that of the conduit and centred at the intersection (C) between the axis of rotation (YY') of the closure member (3) and the axis (XX') of the conduit (2), characterized in that the closure disc (3) is offset parallel to its axis of rotation (YY') and has at its periphery an annular engagement surface (4) adapted to bear on a seat (5) projecting in the conduit (2) which is substantially cylindrical.</p> |
