2 Pneumatic ball valve functions Pneumatic ball valve is mainly used to cut off, distribute and change the flow direction of media on the pipeline. The pneumatic ball valve designed as a V-shaped opening also has a good flow regulation function. The pneumatic ball valve is not only simple in structure and good in sealing performance, but also small in size, light in weight, low in material consumption, small in installation size, small in driving torque, simple in operation, and easy to realize quick opening and closing within a certain range of nominal diameter. It is one of the fastest growing valve varieties in recent decades. Especially in the United States, Japan, Germany, France, Italy, Spain, Britain and other industrial developed countries, pneumatic ball valves are widely used. The variety and quantity of use continue to expand, and they are developing towards high temperature, high pressure, large mouth diameter, high sealing, long life, excellent regulation performance and one valve with multiple functions. Their reliability and other performance indicators have reached a high level, It has partially replaced gate valve, stop valve and regulating valve. With the technical progress of pneumatic ball valves, they will be more widely used in the foreseeable short term, especially in oil and gas pipelines, oil refining and cracking units and the nuclear industry. In addition, pneumatic ball valves will also become one of the leading valve types in the large and medium-sized caliber, medium and low pressure fields in other industries.

3. The valve core and valve seat of single seat pneumatic control valve are deformed and leaked. The main reason is that the casting defects in the production process of single seat pneumatic control valve can lead to the strengthening of corrosion, and the passage of corrosive medium and the scouring of fluid medium can also cause the internal leakage of single seat pneumatic control valve. Corrosion mainly exists in the form of erosion or cavitation. When corrosive medium passes through a single seat pneumatic control valve, it will erode the valve core and valve seat, resulting in deformation or notch of the valve core and valve seat. Solution: The key is to select the type and quality of valve core and valve seat materials, butt weld stellite alloy, and strengthen the hardness of the sealing surface.