The correct choice of valve electric actuator should pay attention to the following: 1, operating torque: Operating torque is the choice of valve electric device of the most important parameters, electric actuator output torque should be the maximum valve operation torque 1.2~1.5 times.

2, the operating thrust valve electric device host structure has two kinds: one is not to configure the thrust disk, direct output torque; the other is to configure the thrust disk, the output torque through the thrust of the valve stem nut into the output thrust.

3, Output shaft rotation number: valve electric device output shaft number of rotation and the valve's nominal diameter, stem pitch, the number of threaded head, to be calculated according to M=h/zs (m for the electric device should be satisfied with the total number of rotation, H for the valve open height, s for the stem drive thread pitch, z for the stem Thread head number). 4, valve stem diameter to many rotary type of valve, if the electric device allows the maximum valve stem diameter can not be equipped with valve stem, it can not be assembled into electric valves. Therefore, the inner diameter of the hollow output shaft of the electric device must be greater than the stem diameter of the valve.

For the part of the rotary valve and the valve in the multiple rotary valves, although not to take into account the passage of stem diameter, but in the selection should be fully considered the diameter of the stem and the size of the keyway, so that after the assembly can work properly. 5, Output speed: valve opening and closing speed if too fast, easy to produce water hammer phenomenon.

Therefore, according to the different conditions of use, choose the right speed of opening and closing. 6, the valve electric actuator has its special requirements, that is, must be able to limit the torque or axial force. Usually the valve electric device adopts a torque-limiting coupling. When the electric device specification is determined, the control torque is determined.

Usually run in a predetermined time, the motor will not overload

7, the control form: the valve electric actuator is divided into the switch type and the adjustment type, the adjustment type actuator signal also divides into the current signal and the voltage information number. 8, control voltage: conventional electric actuator voltage ac220v, ac380v, dc24v, etc.