(1) During the development of ferrule connection in recent years in China, the principle of selecting the "ferrule connection" mode is that when the nut is tightened, the ferrule will be under pressure, causing the edge to bite into the outer wall of the pipe. The conical surface of the ferrule will be connected with the inner conical surface of the joint under pressure, thus preventing leakage. The reason why this pneumatic butterfly valve is adopted is mainly because of its strong connection force, wide application range and high pressure resistance. 　　

The general knowledge of the maintenance of pneumatic butterfly valve is mainly divided into the following four aspects: first, when the butterfly valve is in use, it can not be used again in case of serious damage, but the valve should be stopped as soon as possible. After finding out the cause, select the most reasonable method to completely eliminate the fault. For the pneumatic butterfly valve, you are required to clean it regularly so that the cleanliness of the surface of the butterfly valve will not drop or be too poor.