In recent years, based on the advantages of ordinary plastic-coated steel pipes and combined with the characteristics of flexible socket joints of ductile iron pipes, China has innovatively developed flexible socket plastic-coated steel pipes, which have been promoted and used in various fields.
   Currently, both domestically and internationally, almost all buried water transmission pipelines, including ductile iron pipes, large-diameter (PVC/PE) plastic pipes, glass fiber reinforced plastic pipes, prestressed reinforced concrete pipes, and prestressed steel cylinder concrete pipes (PCCP), use flexible joints. Only steel pipelines still use welding technology. In developed countries such as the United States and Germany, flexible joints have begun to be preferred for buried water transmission pipelines. Welding construction technology is only used when the pipeline working pressure exceeds 2.8 MPa.
Flexible socket plastic-coated steel pipes are still in the early stage of development in China, with wide application and huge market potential, and they are bound to become the first choice for pipeline network construction.

                                            Socket single seal connection                 Socket double seal connection                 Socket lap weld connection                  Socket self-anchored seal connection

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