In general, the industrial special pneumatic butterfly valve is relatively high temperature resistant, and can also adapt to various pressures. The valve has a large diameter, so it is switched back to the valve body made of carbon steel. For example, large high-temperature butterfly valves are welded with steel plates, which are very suitable for gas pipelines with high-temperature media. 　　

Maintenance of pneumatic ball valve I. Before application, use water to clean part of the pipeline and oil circuit board overcurrent to prevent residual iron pins and other dirt from entering the inner wall of the oil circuit board. 2、 When the ball valve is closed, part of the material remains in the valve body, which also bears the necessary working pressure. Before the ball valve is repaired, the shut-off valve in front of the ball valve should be closed first, and the ball valve that must be repaired should be opened to completely release the working pressure inside the oil circuit board. In case of electric ball valve or pneumatic ball valve, switch power supply and source shall be cut off first. 3、 Generally, tetrafluoroethylene (PTFE) is used as the rubber seal for soft sealing ball valves, and the protruding face of hard sealing ball valves is welded with metal materials. If it is necessary to clean the pipeline ball valve, be careful not to damage the sealing ring and leak during disassembly. 4、 When disassembling the flanged ball valve, the bolts and nuts on the flange plate shall be fixed first, then all nuts shall be slightly tightened, and finally fixed with force. If some nuts are forced to be fixed before others are fixed, the gasket surface will be damaged or cracked in the middle of the flange face due to uneven internal pressure, resulting in material leakage from the valve flange connection. 5、 The pneumatic ball valve prompts that if the gate valve is cleaned, the applied organic solvent must be consistent with the parts to be cleaned and not corroded. If it is a special gas ball valve, it can be cleaned with gasoline. Other spare parts can usually be cleaned with raw water. When cleaning, the residual dust, oil stains and other accessories shall be completely cleaned. If it is impossible to clean them with cold water, it is not necessary to purposely clean them with alcohol and other cleaning agents on the premise of destroying the oil road board and spare parts. The assembly line shall not be started until the cleaning agent has completely evaporated. 6、 If slight leakage is found on the filler during the whole process of application, the valve stem nut can be slightly tightened until the leakage ends, and cannot be tightened again. 7、 Long term outdoor storage will cause the gate valve itself and components to rust, and it is impossible for all normal applications. The ball valve shall be waterproof, moisture-proof and waterproof when stored, and the flange cover shall be tightly covered. Gate valves that have been stored for more than 12 months shall be tested again during application to ensure stable characteristics.