| 摘要 |
PURPOSE:To improve the positioning accuracy of valve body while to simplify the electrical structure by detecting the opening of valve port photoelectrically at the outside of valve then controlling an electromagnet for driving a latchet wheel by means of a detected signal. CONSTITUTION:Opening and closing electromagnets 21a, 21b are arranged at the opposite sides of a latchet wheel 13. Electromagnets 24a, 24b for driving a click are mounted on the plungers 22a, 22b of said magnets 21a, 21b. Three through- holes 18 corresponding with full-open, semi-open and full-close positions are made at the predetermined positions on the circumference of a rotary board 16 corresponding with the position of valve body 6. The outputs from three photoreceptors 20 are provided to a control circuit 26 to energize/de-energize the electromagnets 21a, 21b, 24a, 24b. |
