| 摘要 |
<p>A butterfly valve with a disc (1) having two separate side-by-side peripheral edges (3,4) separated by a channel (5). The peripheral edges (3,4) are eccentrically disposed to one another and seat with a suitably shaped valve seat (2) e.g. a sealing ring having one or more outlets (24,25). If one of the edges (3 or 4) leaks e.g. due to damage or a trapped particle, the fluid is prevented from passing to the other side of the disc by the second edge (3 or 4) and drains away along the channel (5) through the or each outlet (24 or 25). Thus the danger of unwanted mixing or contamination is reduced. <IMAGE></p> |
