| 摘要 |
PURPOSE:To correctly further easily control an opening of a valve, by interposing a mechanism, which converts rotary motion of a motor into vertical movement of a valve shaft, between a shaft of the motor and the valve shaft. CONSTITUTION:If a motor 4 is driven, a holder 14 is rotated through a pin 8 in the point end of an arm 6 and a notch 15, into which the pin 8 is inserted, and a screw member 13 integrally formed with the holder is lifted while being rotated in the same direction, then a valve 2 is placed in an open condition. While if the motor 4 is reversely rotated, action of the screw 13 depresses a valve shaft 18, and if the valve shaft reaches its descending end, a protruding pin 16 of the holder 14 is adapted to a contactor 31 of a sensor 30 and a fully closing signal is generated then the motor 4 is stopped. |
