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.

History of valves: valves are produced with the production of fluid pipelines. Human beings have used valves for nearly 4000 years. In ancient China, when taking brine from salt wells to make salt, wooden plug valves were used in bamboo pipelines. In 1800 BC, the ancient Egyptians built large-scale water conservancy projects to prevent the Nile from flooding. They also used similar wooden cocks to control the distribution of water flow. These are the rudiments of valves. The massive application of industrial valves began after Watt invented the steam engine. At the beginning of the 20th century, valves of cast steel, forged steel and forged welding structure appeared.