| 摘要 |
A valve regeneration method is provided with: a replacing step of replacing an old bolt (55) and nut (56) attaching a valve cover (54) to a valve box (53) of a valve (50) with a new bolt (2B) and nut (5N); an enclosing step of enclosing, after the replacement, an upper structure (59) including the valve cover (54) above the valve box (53) of the valve (50) with a tank (T) having a work valve (V); a step of removing the new bolt (2B) or nut (5N) by operating from outside the tank (T); an extracting step of extracting the upper structure (59) and a valve body (5V) inside the valve cover (54) by opening and closing the work valve (V); and an attaching step of attaching the upper structure (59) or the new valve cover (54) and the new valve body (5V) to the valve box (53). |
