The torque required by the valve determines the output torque of the electric actuator, and the electric actuator can determine the electrical parameters of the valve. Therefore, the selection of the electric actuator plays a decisive role in the whole valve operation, especially the multi-turn type. Intelligent electric actuators, in particular, need to pay attention to the above two points.

The torque required for the valve to open and close determines the output torque of the electric actuator. It is usually proposed by the user or the valve manufacturer can choose it. As the actuator manufacturer, it is only responsible for the output torque of the intelligent electric actuator. The valve normally opens and closes. The required torque is determined by factors such as valve size and working pressure. However, due to the difference in machining accuracy and assembly process of valve manufacturers, the torque required for different specifications of valves produced by different manufacturers is also different, even if it is produced by the same valve manufacturer. The torque of the same specification valve is also different. When the torque selection of the actuator is too small, the valve cannot be normally opened and closed. Therefore, the electric actuator must select a reasonable torque range.

Because the electrical parameters of different actuator manufacturers are different, it is generally necessary to determine the electrical parameters when designing the selection, mainly motor power, rated current, secondary control loop voltage, etc., often negligence in this respect, the result control system Mismatch with the parameters of the electric actuator causes malfunctions such as working time open tripping, fuse blowing, thermal overload relay protection and jumping.