| 摘要 |
PROBLEM TO BE SOLVED: To provide a selector valve for a safety valve, allowing the removal of one safety valve for inspection while surely opening the remaining one safety valve and a plant shut-off valve. SOLUTION: A valve body 2 having two outlet ports 5, 6 and an inlet port 3 therebetween incorporates two seats 7, 8 each provided for the exit ports 5, 6 and one valve element 9 movable between two seats 7, 8. When the valve element 9 is moved with the operation of the valve body 2 at the outside, the closure of one seat follows the opening of the other seat, preventing both seats from being closed at the same time.
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