First, the working principle: electric soft seal butterfly valve is a circular disc with the valve opening and closing of orange rotating done to enable the operation of pneumatic valves to achieve the main shut-off valve to make use of, or can also be designed to have a regulating valve and regulated segments function, currently used on the low-pressure valve disc medium and large diameter pipe is increasing. The main advantages of electric soft seal butterfly valve, simple structure, small size, light weight, low cost, pneumatic seal butterfly This feature was particularly notable, install underground passage at high altitude, after two five-way solenoid valve control operation convenient, adjustable flow media . Fluid resistance is small, while the large-diameter pneumatic butterfly valve is fully open and effective flow of larger, open and close rapidly effort, pull the disc rotation angle of 90 to complete the opening and closing, due to the shaft side dish wrench media force nearly equal, while the opposite direction of the torque generated, and thus a smaller opening and closing torque, low pressure can achieve a good seal, butterfly valve seal materials NBR, Viton, edible rubber, PTFE lining so good sealing performance, including sealing butterfly advantages of hard and soft valves for heavy metal sheets stacked with a metal seal and a resilient seal, both at low temperatures have excellent sealing properties. Electric soft seal butterfly valve plate mounted on the pipe diameter direction. Cylindrical channel in the valve body, disc-shaped disc around the axis of rotation, rotation angle between 0 ° ~ 90 °, rotated to 90 °, the valves are open all license conditions. Electric soft seal Butterfly simple structure, small size, light weight, only by a few parts. And just rotate 90 ° to quickly open and close, easy to operate, while the electric valve has good flow control characteristics. Butterfly valve in the fully open position, the disc thickness is only resistance medium flows through the valve when the pressure generated by the valve drop is small, it has a better flow control characteristics. Butterfly shells sealed and two metal seal type. Elastic sealing valves, seals can be mounted on the body or attached to the disc periphery. With long metal seal valve life in general than the elastic sealing valve, but it is difficult to completely seal. Metal seal can adapt to higher operating temperature, flexible seal is restricted by temperature defects.