The basis for the correct selection of the electric device of the valve

â—†Operating torque:
The operating torque is the most important parameter for selecting the electric device of the valve. The output torque of the electric device should be 1.2 to 1.5 times the maximum torque of the valve operation.
There are two kinds of main structure of the valve electric device: one is that the thrust plate is not arranged, and the torque is directly output; the other is to configure the thrust plate, and the output torque is converted into the output thrust through the stem nut in the thrust plate. â—† The number of rotations of the output shaft :
The number of revolutions 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 total number of revolutions that the electric device should meet, and H is the valve. Opening height, S is the stem drive thread pitch, Z is the stem thread number)
â—† stem diameter:

For multi-turn type open-end valves, if the maximum stem diameter allowed by the electric device cannot pass through 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. â—† Output speed :
If the opening and closing speed of the valve is too fast, water hammer is likely to occur. Therefore, the appropriate opening and closing speed should be selected according to different conditions of use.

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