| 摘要 |
To provide a motor-driven valve without requirement that a check valve is separately connected through piping in parallel and without a built-in check valve. A motor-driven valve 1 according to the present invention having a valve body 7 linearly moving by rotation of a rotor 15 of an electric motor and controlling a valve opening between the valve body 7 and a valve seat 6, and the motor-driven valve 1 is characterized in that: in a first valve opening range, the valve opening and flow rate of fluid have a predetermined correlation, and in a second valve opening range, flow rate more or equal to four time as much as controllable maximum flow rate in the first valve opening range can pass the valve 1. It is possible to use the motor-driven valve 1 for cooling/heating systems and to control flow rate of refrigerant in cooling in the first valve opening range and allow a large amount of the refrigerant to pass the valve in heating, so that only one electronic valve can satisfy performance of conventional valves.
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