| 摘要 |
The invention provides a fluid flow path or source selector valve, comprising a valve body defining a valve chamber with a main port a pair of subsidiary ports and a valve seat internally of the chamber for each subsidiary port, valve means mounted in the chamber for movement across the chamber between the valve seats and defining a pair of valve faces each adapted for sealing engagement with one of said valve seats, and fluid pressure operated actuating means for effecting movement of the valve means across the valve chamber to selectively seal off one or other of said subsidiary ports.
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