The double flange pneumatic ball valve is the flange connection of the pneumatic ball valve of both parties. The pneumatic ball valve and the valve can be connected to the pneumatic ball valve when installed. It is limited by a loose combination of short sleeve and flange pipe, which can prevent the leakage and damage of pneumatic ball valve due to excessive compensation of joint displacement. It is mainly to use the loose connection setting of pressure pneumatic ball valve thrust within the range of allowable absorption of axial displacement and axial displacement. Connection with flange, installation, product adjustment and flange connection: pneumatic ball valves are installed at both ends of the right angle length, and both sides compress the nuts and bolts uniformly, and then adjust the nut limit, so that we can make the internal pneumatic ball valve with free and flexible stretching amount, lock the stretching amount, and ensure the safe operation of the pneumatic ball valve. The double flange pneumatic ball valve has the advantages of simple structure, simple assembly and disassembly, and can compensate for the displacement, deflection and dislocation caused by thermal expansion and cold contraction of the pipeline. It is widely used for pneumatic ball valves used to transport water, oil, gas and granular powder media on ships and land to connect their limited type pneumatic ball valves, pneumatic ball valves, split expansion joints, spherical joints, etc. The use of pneumatic ball valve indeed brings great convenience to the installation and use of pneumatic ball valve project. As far as the medium delivery mode is concerned, pneumatic ball valves are often used on pressurized pneumatic ball valves, so there are high requirements for the sealing performance of their materials. At present, products often use high-quality sealing rings to solve this problem. However, for the pneumatic ball valve among them, because it needs to ensure the displacement adjustment caused by the thermal expansion and cold contraction of the pneumatic ball valve, the free expansion is often designed, and the sealing performance of the pneumatic ball valve can still be maintained within its effective expansion range, but it also brings the strictness of the pneumatic ball valve connected with it and the installation requirements. The pneumatic ball valve for large-diameter pipeline is not obvious in some small displacement of thermal expansion and cold contraction during normal use. However, when the pneumatic ball valve is used under special circumstances, the installation position of the pneumatic ball valve is different, and the effect is often different. The service life of the double flange pneumatic ball valve produced by Dongfeng pneumatic ball valve is relatively long in the same industry. Generally, when the product leaves the factory, our company will spray a layer of high-quality corrosion resistant and wear-resistant coating on the outside of the product to protect the pneumatic ball valve from loss as a surface protection layer. Because of its good wear resistance and corrosion resistance, the double flange pneumatic ball valve products are used for mine pneumatic ball valve, sewage treatment pneumatic ball valve, desulfurization and dust removal pipeline, powder The pneumatic ball valve for slurry transportation has been installed and used for many times.