| 摘要 |
<p>A butterfly valve intended for use in a piping system and comprising a body pierced by a duct located opposite to the two sections of the piping system and a closure disc rotatably mounted on the valve body and offset laterally with respect to its axis of rotation; the valve disc is provided at its periphery with a convex annular bearing face, the valve body is fitted with an annular seal which projects into the interior of the duct and said annular bearing face constitutes a seating for the seal in the closed position. A high standard of leak-tightness in the closed position of the valve is achieved owing to the combination of the offset valve disc and of the annular projecting seal applied against the bearing face of the valve disc.</p> |
