Metal plane seal pneumatic butterfly valve features 1) the use of lever-type opening and closing structure, the seal relative sliding between the small, reducing the relative wear and tear. (2) The implementing agency uses the connecting rod augment mechanism. This mechanism in the butterfly valve is closed, the drive can output the maximum torque, and has self-locking performance, safe and reliable. (3) the use of metal seal structure, with strong corrosion resistance and wear resistance, suitable for high temperature environment, long service life. (4) The key components were optimized, so that the total number of valve opening and closing can reach 1 × 106 times or more. (5) The valve control system uses non-contact electromagnetic reed switch, not subject to environmental conditions, and the signal sensitivity, high accuracy, remote remote control, pneumatic control and automatic control, and equipment can also be achieved without supporting People operate.