| 摘要 |
An air regulator valve has a knob which is slidable between a locked position in which it engages teeth on the end of a valve bushing and an unlocked position in which it can be rotated about the valve bushing to rotate the valve shaft. A lock tab is fastened to the end of the shaft and extends through an opening in the knob. The knob is locked in the down position by passing a padlock shackle through an opening in the lock tab.
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