| 摘要 |
A sealing seat arrangement 16a suitable for use as an upstream sealing seat arrangement of an isolation valve assembly such as a rotary gate valve comprises an annular seat 34 extending along an axis B and comprises a first portion 36, a second portion 38, and a shoulder portion 40 linking the first and second portions. The first portion 36 has a diameter greater than that of the second portion 38. A generally frustoconical seal ring 44 and a first seal arrangement 42 are received on the second portion 38 of the seat 34 such that the seal ring 44 is received between the shoulder portion 40 of the seat and the first seal arrangement 42. |
