Ventilation butterfly valve is a non-sealed butterfly valve. There are mainly large ventilation butterfly valves, electric ventilation butterfly valves, and explosion-proof ventilation butterfly valves. It is mostly suitable for pipes with a medium temperature of ≤300 degrees Celsius and a nominal pressure of 0.1Mpa in production processes such as building materials, metallurgy, mining, and electric power, to connect, open and close, or adjust the medium flow. Ventilation butterfly valves are divided into manual and electric transmission, which can be driven by an electric motor or worm gear to drive the actuator, so that the butterfly plate rotates within 90° to achieve the purpose of opening and closing or adjusting the medium flow. It has compact structure, light weight, easy installation, small flow resistance, large circulation volume, avoids the influence of high temperature expansion, and is easy to operate.



