| 摘要 |
<p>Disclosed is a butterfly valve where the sealing structure made between a rigid metal seat (130) and a rigid valve disc (126) is improved such that the valve disc (126) is closely contacted with the metal seat (130) with a zero point of contact and separated from the metal seat (130) from the zero point of contact, thereby ensuring that the sealing and durability thereof are greatly advanced at a high temperature and at a high pressure. The contact faces (127a, 127b) between the metal seat (130) and the valve disc (126) are straight lines BC and DE and guarantee a high sealing effect without using elastic or frictional behaviour of the valve seat or the valve disc.</p> |
