| 摘要 |
Apparatus for use in controlling the flow of fluid between first and second zones (9 and 10) and a common region (26) comprises: a first passageway (17) for providing a first fluid flow path, between the first zone (9) and the common region (26), in use of the apparatus; and a second passageway (23), outside the first passageway (17), for providing a second fluid flow path, between the second zone (10) and the common region (26), in use of the apparatus. The first passageway (17) is provided with first flow control means (25), for controlling the flow of fluid between the first zone (9) and the common region (26), and the second passageway (23) is provided with second flow control means (28), for controlling the flow of fluid between the second zone (10) and the common region (26).
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