| 摘要 |
PROBLEM TO BE SOLVED: To provide a shut-off valve capable of immediately grasping a factor of position change of a valve element from an open position to a close position, and capable of rapidly performing returning work.SOLUTION: A shut-off valve includes a motor M for driving a drive mechanism interlocked and connected with a valve element, a switch 5 for driving the motor M, an earthquake detector 41 for detecting an earthquake, display means 17 and 18 for displaying that the valve element is in a close position, and display control means 40 for controlling display displayed by the display means 17 and 18. Drive control means 39 for controlling driving of the motor M includes first control means 39A for controlling driving of the motor M by a signal from the earthquake detector 41, and second control means 39B for controlling driving of the motor M by a signal from the switch 5. The display control means 40 displays the display displayed by the display means when the valve element is operated by the first control means 39A and the display displayed by the display means when the valve element is operated by the second control means 39B to be different from each other.SELECTED DRAWING: Figure 9 |
