The expansion joint has good corrosion resistance, does not need to be modified after installation, and can be placed at room temperature for a long time without considering the expansion amount. It is suitable for liquid, gas and solid media, withstanding tensile force and acid and alkali corrosion resistance. According to the expansion amount of the pipeline can be divided into two categories: rigid sleeve expanders and flexible compensators. The expansion volume of flexible sleeve expanders is small, but if the expansion is greater than 10 times, the installation form must be changed. Since the packing and inner and outer seal inside the expander cannot be in close contact with the pipe, it cannot play the role of connection and compensation, but can only be used as a tool to transmit displacement.
