Pneumatic control butterfly valves utilize compressed air to adjust the disc opening, thereby regulating the flow rate of the medium. These adjustable pneumatic butterfly valves primarily consist of a butterfly valve integrated with a pneumatic actuator, a valve positioner, and other accessories. Upon receiving a 4-20mA signal from the valve positioner within an automation system, the pneumatic control butterfly valve adjusts its opening degree using 0.4-0.7MPa inlet air pressure. This enables proportional and precise regulation of process parameters such as flow rate, pressure, temperature, and liquid level within pipelines, making it an optimal device for flow control and fluid shutoff. Pneumatic control butterfly valves can be equipped with different sealing elements (soft seal or hard seal) according to operational requirements to meet diverse application needs. They are widely used in pipelines carrying chemicals, environmental protection fluids, air, water, gas, steam, and corro