It is very important to carry out scientific management and maintenance for the natural gas pneumatic ball valve during the construction period. Proper equipment management and scientific maintenance during the construction period can not only ensure safety, but also greatly reduce the cost during the construction and operation management period. What should be done for the maintenance and repair of natural gas pneumatic ball valves? What should be paid attention to? The following aspects: ① Use correct methods to load and unload natural gas valves to avoid mechanical damage to the valves. When lifting the valve, the lifting belt cannot be tied to the valve stem or actuator for lifting, otherwise the valve stem will be bent, the valve diameter seal will fail and the gearbox will be damaged; ② Before leaving the factory, simple blind plates shall be installed at both ends of the valve to prevent water, sand and other impurities from entering the valve chamber during transportation and on the site, which may cause corrosion and damage to the seal; ③ At the construction site, the valves should be placed neatly on the sleepers, not anywhere, to avoid damage or breakage of the drain nozzles, grease injection nozzles, etc.; ④ The valve must be greased before installation. On the one hand, check whether the grease injection channel is unblocked by injecting grease, on the other hand, fill the sealing surface and rear chamber of the valve seat to prevent impurities from entering the sealing surface and rear chamber, and at the same time, reduce the damage of the valve seat caused by high welding temperature to a certain extent; ⑤ Keep the valve in the fully open position during the whole installation process; ⑥ After welding, hydrostatic test and each operation, a certain amount of grease shall be added in time; After the hydraulic test, the water in the valve chamber shall be drained in time to prevent corrosion and icing. ⑦ The natural gas pneumatic ball valve must be cast steel pneumatic ball valve or stainless steel pneumatic ball valve that can resist sulfur. The ball must be a hollow ball, not a hollow ball. The internal ball lift and valve stem shall be made of 316 stainless steel or equivalent materials. 　

The type of valve can be determined from the information obtained from the above analysis. Basically, stop valve and gate valve can be selected. Because the performance price ratio of gate valve is higher than that of globe valve at the same pressure level, it is better to select globe valve. Therefore, the model of zui rear stop valve is J41H-25CDN100.