The electric ball valve can realize remote control and on-site control. Selecting the right electric device can prevent the torque from being too small and can't switch the electric ball valve. When selecting the electric device, pay attention to: Operating torque The operating torque is the most important parameter for selecting the electric valve device. The electric device The output torque should be 1.2 to 1.5 times the maximum torque of the valve operation. There are two kinds of mainframe structures used to operate the thrust electric valve device: one is to directly output the torque without configuring the thrust plate; 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. Output shaft rotation number The number of rotations of the output shaft of the electric valve device is related to the nominal diameter of the valve, the pitch of the valve stem, and the number of threads. It is calculated according to M=H/ZS (M is the total rotation that the electric device should meet. Number, H is the valve opening height, S is the valve stem transmission thread pitch, Z is the valve stem thread head number). Stem Diameter For multi-rotary type stem valves, if the maximum valve stem diameter allowed by the electric device cannot pass through the stem of the valve with which it is fitted, it cannot be assembled into an electric valve. Therefore, the inner diameter of the hollow output shaft of the electric device must be greater than the outer diameter of the stem of the stem valve. For the rotary valve and the multi-rotary valve, although the stem diameter does not have to be taken into account, the diameter of the stem and the size of the key groove should be fully taken into account during the selection, so that the assembly can work normally. If the speed of opening and closing of the output speed valve is too fast, water hammer may easily occur. Therefore, the appropriate opening and closing speed should be selected according to different conditions of use.
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