2、 Function of pneumatic ball valve Pneumatic ball valve is mainly used to cut off, distribute and change the flow direction of medium on the pipeline. The pneumatic ball valve with V-shaped opening also has 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 pneumatic ball valves 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 types of pneumatic ball valves in the fields of large and medium-sized caliber, medium and low pressure in other industries.

Double eccentric sealing pneumatic butterfly valve The sealing principle of double eccentric sealing pneumatic butterfly valve is to form an angle deviation between the axis center of the butterfly plate and the center line of the valve body based on the single eccentric butterfly valve, which is called offset b. When the butterfly valve opens, the sealing surface of the double eccentric butterfly plate will be easier to disengage from the valve seat than the single eccentric sealing surface. If the butterfly plate rotates to 8 ° - 12 °, The sealing surface of the butterfly plate will be completely separated from the valve seat. When the butterfly valve is fully opened, a larger clearance Y will be formed between the two sealing surfaces. The reason for the design of the double eccentric sealing structure is mainly to reduce the mechanical wear between the two sealing surfaces, make it more durable, and not reduce the sealing performance.