The disc of metal seals triple offset butterfly valve is installed in the diameter direction of the pipe. In the cylindrical passage of the butterfly valve body, the disc rotates around the axis, and the rotation angle is between 0°and 90°. When the rotation is 90°, the valve is fully opened. As a regulating and shutting off flow system, it is widely used in the industrial pipelines of metallurgical, electric power, petrochemical, water supply and drainage, and municipal construction with medium temperature ≤425℃.