| 摘要 |
PROBLEM TO BE SOLVED: To provide a practical motor-operated valve having a simple and less-expensive structure.SOLUTION: A motor-operated valve 1 comprises a case 4 including a stepping motor 2 and a gear speed reducer device 3 for reducing a rotational speed of the motor 2; a valve main body 7 having a valve chamber 6 and a valve seat 5; a final output shaft 25 installed in the valve main body 7 to cause a rotation of the motor 2 to be transmitted through the gear speed reducer device 3 and thereby ascended or descended: a valve body comprising a second valve body 11 formed with a semi-spherical recess 11B formed at an upper surface contacted with a semi-spherical abutment part 25A protruded at a lower surface central part of the final output shaft 25 and a first valve body 10 fixed to the second valve body 11 and ascended or descended in the valve main body 7 as the final output shaft 25 is ascended or descended to move toward or away from the valve seat 5; and a bellows 13 of which upper end is fixed to a ring-like fixing member 17 fixed to the valve main body 7 and of which lower end is fixed to the second valve body 11 arranged in it and installed in the valve chamber 6.SELECTED DRAWING: Figure 2 |
