| 摘要 |
<p>A seal assembly, to establish a rotary seal between a shaft member and an opening in the wall of a vessel which in use has different fluid pressures on opposite sides of the wall of the vessel, has an annular plate-like housing (1), and a sleeve (2) inserted therethrough, the sleeve being rotatable about its axis. The housing (1) is attachable to a wall in the vessel. The sleeve has a groove (4) which accommodates the base (5) of an annular seal member (6), thereby restraining the base portion of the seal member from axial movement towards a smooth flat face portion (8) of a removable ring (9) of a hard polished material, which is sealed in the housing (1) against leakage by the use of O-ring (10), which movement would otherwise occur by virtue of fluid pressure on the seal member (6). A lip portion (7) of the seal (6) sealingly abuts the smooth flat face portion (8) and is adapted to be urged against the smooth face thereof under fluid pressure so as to establish said rotary seal. In the internal wall of the sleeve (2) there is provided a groove (11) and O-ring (12) which co-operate to provide a seal between the sleeve (2) and a shaft which may be inserted therethrough.</p> |
