| 摘要 |
A motor-operated valve (1) has a rotor unit (60) in a can (30), and is rotationally driven by a stator unit (40). The rotation of the rotor unit (60) is transmitted to a screw feed member (70). A stem member (110) fixed to a valve body (10) is engaged threadedly with the screw feed member (70) by a first screw portion (S 1 ). At the same time, the screw feed member (70) is engaged threadedly with an external thread portion (160) fixed to a valve stem (120) by the second screw portion (S 2 ). The first screw portion (S 1 ) and the second screw portion (S 2 ) constitute a differential screw mechanism, and feeds the valve stem (120) according to a difference in pitch. |
