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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