The ventilation butterfly valve is driven by a manual actuator, allowing the disk plate to rotate freely within a 90° range to achieve the purpose of opening and closing or regulating the flow of medium. Flanged butterfly valves, lined with fluoroelastomer and rubber-lined butterfly valves are components used to control the shutdown and flow rate of pipeline systems, and have been widely applied in many fields such as petroleum, chemicals, metallurgy, and hydropower. In the known butterfly valve technologies, the sealing forms mostly use sealing structures, with sealing materials being rubber, polytetrafluoroethylene, and others.