| 摘要 |
<p>A butterfly valve seat structure has a polymeric sealing head (8) slidably supported on the radially inner portion (12) of a flat metal washer (9) so as to be capable of radial sliding movement on the washer (9), a radially outer portion (10) of the washer being rigidly clamped between the valve housing (1) and the seat retaining ring (6), and a radially intermediate portion (11) of the washer is capable of axial movement relative to the axis of the valve passage to facilitate axial movement of the sealing head (8). Axial projections (27, 28) on the head (8) serve to resist any tendency to blow-out of the sealing head. The combined abilities of the sealing head to move axially and radially help to provide a good sealing action against the valve disc (3).</p> |
