Because of the expansion joints are  metal products, it has higher tensile and compressive strength, soft sealing   superior performance  , convenient loading and unloading, and other functions,which  is widely used in electric power, metallurgy, chemical industry, water supply and drainage and sewage treatment, etc.Expansion joint is mainly used  on the water pump in the connection between the valves and pipes.Expansion joint in the pipe run multidirectional displacement effect to a certain extent, to the pipeline in operation due to the heat from the cold, tectonic subsidence and stress the important role in scaling compensation, therefore, expansion joint can alleviate the blind thrust in pipeline operation, play a protection of the pipes, especially to the pipeline installation and maintenance provides great convenience.
Expansion joint has a certain gap between ontology and telescopic tube, giving it a certain axial and radial displacement, therefore, the expansion joint in the pipe can be effective compensation and relief pipe blind thrust, and can facilitate the water pump, valve installation and maintenance and replacement, expansion joint is a pipeline installation and operation of the ideal accessory products.