Pneumatic fluorine-lined butterfly valve is a special type of valve, which has a wide range of applications in the industrial field. The following is a detailed introduction to the pneumatic fluorine-lined butterfly valve: 

 1. Definition and alias 

 Pneumatic fluorine-lined butterfly valve, also known as pneumatic-lined anti-corrosion butterfly valve, is a valve with a polytetrafluoroethylene (PTFE) lined butterfly plate with a spherical sealed surface. This valve is driven by a pneumatic actuator to quickly cut off or adjust the flow rate. 

2. Working principle 

 The working principle of the pneumatic lined fluorine butterfly valve is based on the drive of the pneumatic actuator and the sealing performance of the fluoroplastic lining. The pneumatic actuator receives control signals (such as 4-20mA current signals or 0-10V voltage signals) and converts them into mechanical energy through the force of compressed air. The mechanical energy drives the valve stem to rotate, and then drives the butterfly plate to rotate 90 degrees in the valve body. The rotation of the butterfly plate realizes the opening and closing of the valve, thus controlling the opening and closing of the fluid. The fluoroplastic lining forms a sealing barrier between the butterfly plate and the valve body wall, which effectively prevents medium leakage. 

3. Features and advantages 

 Strong corrosion resistance: Fluoroplastic lining has excellent corrosion resistance and can resist the erosion of a variety of corrosive media, which is especially suitable for strong corrosive media such as acids and alkalis. 

 Good sealing performance: a tight sealing structure is formed between the fluoroplastic lining and the butterfly plate to ensure that the valve does not leak when it is closed. 

 Quick opening and closing: The pneumatic actuator has the characteristics of strong driving force and fast response speed, so that the valve can be opened and closed quickly. 

 Novel design: The pneumatic fluorine-lined butterfly valve is novel and reasonable in design, unique in structure, light in weight, easy to install and maintain. 

 Wide scope of application: It can be used in various media, including corrosive media and high-temperature media, as well as gas, liquid and solid particle media. 

4. Classification and connection methods 

 Pneumatic fluorine-lined butterfly valves can be divided into pneumatic clamp-lined fluorine-lined butterfly valves and pneumatic flange-lined fluorine butterfly valves according to the connection method. In addition, switchable or adjustable actuators can also be selected according to the requirements of working conditions. 

5. Classification and connection methods 

 Pneumatic fluorine-lined butterfly valves are widely used in medium regulation and flow control in chemical, pharmaceutical, petroleum, food and other industrial fields. It is especially suitable for applications in harsh environments such as high temperature and high pressure, such as petrochemical, electric power, steel and other industries. At the same time, it is also suitable for transporting dust, particles, fibers and other solid particle media. 

6. Precautions 

 Although the pneumatic fluorine-lined butterfly valve has excellent corrosion resistance and sealing performance, it is limited by temperature and is generally suitable for media between -50℃150℃ (or -50℃180℃). 

 For the medium temperature and pressure are too high or the process medium is granular, the pneumatic fluorine-lined butterfly valve should be carefully selected, and the use of a butterfly valve with metal sealing material may be considered. 

 In summary, pneumatic fluorine-lined butterfly valves play an important role in the industrial field with their unique corrosion resistance and sealing properties. When choosing and using, reasonable choices should be made according to the specific working conditions and requirements.