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Several important principles for the selection of electric actuators in imported electric valves

In general, the correct choice of valve electric actuators is based on the following:
1. Operating torque: The operating torque is the most important parameter for selecting the electric device of the valve. The output torque of the electric actuator should be 1.2 to 1.5 times the maximum torque of the valve operation.
2. There are two types of mainframe structures for operating the thrust valve electric device: one is to configure the thrust disc without the thrust disc; the other is to configure the thrust disc, and the output torque is converted into the output thrust through the stem nut in the thrust disc.
3. Number of rotations of the output shaft: The number of rotations of the output shaft of the valve electric device is related to the nominal diameter of the valve, the pitch of the valve stem and the number of threads. It should be calculated according to M=H/ZS (M is the electric device should be satisfied) The total number of revolutions, H is the valve opening height, S is the stem drive thread pitch, and Z is the stem thread number).
4. Stem diameter for multi-turn type open rod valves. If the maximum stem diameter allowed by the electric device cannot pass the valve stem of the valve, it cannot be assembled into an electric valve. Therefore, the inner diameter of the hollow shaft of the electric device must be larger than the outer diameter of the stem of the open rod valve. For the partial rotary valve and the dark rod valve in the multi-turn valve, although the problem of the diameter of the stem is not considered, the diameter of the stem and the size of the keyway should be fully considered in the selection, so that the assembly can work normally.
5. Output speed: If the opening and closing speed of the valve is too fast, it is easy to produce water hammer. Therefore, the appropriate opening and closing speed should be selected according to different conditions of use.
6. Valve electric actuators have special requirements, that is, they must be able to limit torque or axial force. Usually the valve electric device uses a torque limiting coupling. When the specifications of the electric device are determined, the control torque is also determined. Generally running in a predetermined time, the motor will not be overloaded.

The above are some common problems to be aware of when selecting an electric actuator. I hope that it will help you in the future selection of electric actuators.

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