The hardness of the pneumatic ball valve is directly related to the use of the product. At present, the best quality pneumatic ball valve is metal material, also called wear-resistant alloy material, which is the most wear-resistant of metal materials. Considering the special usability of this equipment, the selection of materials has also been improved to a certain extent, so more long-term use practices have also been added, Although the national production standards for this equipment are relatively low, the quality of pneumatic ball valves produced by the country is very high.

Therefore, unlike the existing technology, the utility model is not installed on the valve plate with soft and hard multi-layer sealing rings, but directly installed on the valve body. Adding an adjusting ring between the pressing plate and the valve seat is a very ideal two-way hard sealing mode. It can replace gate valve, globe valve and ball valve. Butterfly valve is suitable for flow regulation. Since the pressure loss of butterfly valve in the pipeline is relatively large, about three times that of gate valve, when selecting butterfly valve, the impact of pressure loss on the pipeline system should be fully considered, and the solidity of butterfly plate to withstand pipeline medium pressure when closing should also be considered. In addition, consideration must be given to the limits of the operating temperature of the resilient seat material at high temperatures.