| 摘要 |
PURPOSE:To prevent an actuator from projecting from a top plate, by locating the actuator at a fixed position spaced apart from a main valve, and connecting an output shaft of the actuator with an opening/closing operational portion of the main valve by a universal coupling. CONSTITUTION:An actuator 5 is not directly mounted on an upper portion of a bomb 1, but it is located outside a bomb accommodation box 2 in spaced relationship from the bomb 1. That is, the actuator 5 is not interposed between the upper portion of the bomb 1 and the bomb accommodation box 2, thereby preventing a space above the bomb 1 from being blocked. Accordingly, upon replacing another bomb having a large capacity, the actuator located above a tank as in the prior art may be prevented from contacting a top plate 2. Further, since a driving torque of an output shaft 6 of the actuator 5 is transmitted through a universal coupling 7 to a chuck 8, it is not necessary to make a position of the output shaft 6 coincident with a position of an operation handle 3a of the main valve 3. |
