| 摘要 |
PURPOSE:To assure easy and simple achievement of initial positioning of the valve referred to in the title above by providing a double-nut mechanism between the valve operating stem and motor shaft in said valve which is opened or closed by rotating a feed-screw type valve operating stem to right or left by means of a motor. CONSTITUTION:A valve operating stem 12 is associated with the valve body 11 on the bearing side by connecting means 21. When the valve operating stem 12 is made to rotate to right or left by motor 23, said stem 12 moves up or down via coil spring 22a of joint 22 so that the refrigerant passage area 13a is controlled and determined by the position of the end of said stem, 12a. In order to determine the initial position of the valve operating stem 12, the position for the minimum valve opening is determined by means of the nut 28a of the double- nut mechanism 28 and then it is rotated to right or left to make finer adjustments. |
