Assembly of pipe fitting union

　　The most important part of the pre-assembly of the pre-installed jacket pipe fitting union directly affects the reliability of the seal. Generally, special preheaters are needed. Connections with small diameters can be pre-installed on bench pliers. The concrete method is to use a union as the matrix and High Pressure Forged Carbon Steel Pipe Fittings Socket Weld Union on the pipe. The main types are the jacket type through pipe connector, the jacket type end through pipe fitting union connector and the jacket pipe fitting tee connector.

　　The author finds that even if the same manufacturer has a batch of goods, the depth of conical holes on these pipe fitting union is often different, resulting in leakage, and this problem is often ignored. The correct way is, what kind of pipe fitting union body is used to connect one end of the pipe, and the corresponding union end is prefabricated with the same type of union, so as to avoid leakage problem to the greatest extent. The end face of the pipe should be level. After the pipe is sawed, it should be polished smoothly on tools such as grinding wheels, deburred, cleaned and blown with high-pressure air before use. When preloading, the coaxiality between the pipe and the union body should be maintained as far as possible.