| 摘要 |
A butterfly valve has a seal assembly (6) for engaging with the closed valve disc (4) in the form of a primary seal (14) carried in one recess of an H-shaped (figure 1) or h-shaped (figure 2) seal carrier (7), the seal carrier (7) being axially slidable with respect to the valve housing (1), and being biassed axially by a resilient washer (8), whereby the primary seal (14) is biassed against the closed disc (4). |
