Urgent help needed with a valve issue
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Is it true that, in the 716 accident, the valve had to be rotated 80,000 times to be closed completely? If it’s true, could you give an example of a similar valve model?
That can’t be true; what valve needs to be turned that many times? Only a fool would use it that way
Calculated at one rotation per second (it’s not that fast in the video), there are 60 rotations per minute, 3600 rotations per hour, and 86400 rotations in 24 hours. This can be determined by referring to the timeline in the video
This is directly related to the valve size and the reducer selected; this situation may occur when a larger speed ratio reducer is used for large valves. As far as I know, there are reduction gears with a ratio of 20,000:1; that is, the handwheel needs to turn 20,000 times for the valve screw to turn just once. Such linear-motion valves require hundreds or even thousands of turns to be fully opened or closed, and from this you can estimate how much time it will take to complete such a rotation.
It does take a long time to close large-diameter valves
This type of valve is likely fictional.