1. Determine the electrical parameters according to the selected electric actuator. Because the electric parameters of different electric actuator manufacturers are different, generally the electrical parameters need to be determined when designing and selecting, mainly including motor power, rated current, and secondary control loop voltage. Etc., often inadvertently in this regard, as a result, the mismatch between the control system and the parameters of the electric actuator caused faults such as air-open tripping, fuse blowing, and thermal overload relay protection tripping.
2. Determine the output torque of the electric actuator according to the torque required by the valve. The torque required to open and close the valve determines how much output torque the electric actuator chooses. Generally, it is proposed by the user or the valve manufacturer to choose it as the actuator manufacturer. It is only responsible for the output torque of the actuator. The torque required for the normal opening and closing of the valve is determined by the valve diameter, working pressure and other factors. However, due to the difference in processing accuracy and assembly technology of valve manufacturers, different valve manufacturers of the same specifications The required torque is also different. Even the torque of the valve of the same specification produced by the same valve manufacturer is also different. When the torque of the actuator is selected too small, the valve cannot be opened and closed normally. Therefore, a reasonable electric actuator must be selected. Torque range.
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