The basic principle of the electric regulating butterfly valve is fixed on the disc plate of the shaft center. Close and close the valve seat and position disc. When the disc rotates around the valve stem and is parallel to the flow direction of fluid, the valve is fully opened. On the contrary, when the disc is perpendicular to the flow direction of the fluid, the valve closes. The torque for operating the butterfly valve is determined by the friction between the valve stem, valve seat and packing. When the valve is closed, the torque of the valve is the largest and the rotating torque is reduced. 　

The use frequency of electric on-off butterfly valve is very high, because compared with ordinary electric on-off butterfly valve, its use range is more extensive, because the speed of electric on-off butterfly valve when opening and closing can be adjusted, and its structure is relatively simple, and it is very easy to maintain, In fact, every time the electric butterfly valve is opened, a buffering effect will appear, so that sudden particles or impurities will not be stuck out, but there must be a gas source when using, so it is relatively simple to control.