Expansion joints exist to relieve friction between objects.

There is a need to use expansion joints in pipeline installation, which can absorb axial, longitudinal and angular deflections of the pipeline, prevent pipeline vibration and reduce noise. Expansion joints exist to relieve friction between objects, heating pipes often encounter a problem, in the heating pipeline, when the pipeline is not hot or cold water, the pipe will shrink, the volume will become smaller, in order to deal with this situation will use expansion joints, expansion joints can effectively solve the problem of expansion and contraction.
The expansion joint looks like a spring, when it feels the tension of the pipe, the expansion joint will contract, and if it feels the stress of the pipe, the expansion joint will stretch, effectively protecting the pipe.
Spring is a limit of elasticity, if the spring is too straight, the spring may lose its role, the same expansion joint if not installed bracket to protect it, once the stretching reaches a certain limit, the entire expansion joint will lose its actual effectiveness.
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