1 Overview With the continuous development of industry, the demand for pneumatic ball valves, especially those under high temperature and high pressure conditions, is increasing, requiring pneumatic ball valves to have higher wear resistance, erosion resistance, high temperature resistance, corrosion resistance and other properties. While the traditional full bore pneumatic ball valve has undergone surface hardening treatment by surfacing, spraying and other technologies, its service life, cost and performance still cannot meet the operating requirements, such as industrial silicon, coal chemical industry, blast furnace gas, gas and other harsh conditions.

However, if the pipeline pressure is not very high (below 6.4Mpa), it can also be used. However, because of the high temperature, it is recommended to use metal hard seal butterfly valve. The eccentric butterfly valve with valve body WCB can be used. Pay attention to the flow direction during installation. The pipeline should be kept as clean as possible to prevent welding slag from getting stuck on the sealing surface, which is easy to fail to close tightly.