The retractor (steel retractor) is also called a telescopic joint, an expansion joint, a compensator, and an expansion joint. The retractor (steel retractor) is divided into: steel retractor, rubber retractor, stainless steel retractor. The steel telescopic device can be axially extended and retracted within a certain range, and can also overcome the offset caused by the different axial joints of the pipe within a certain angle, which can greatly facilitate the installation and disassembly of the valve pipe, and the amount of expansion and contraction of the pipe is allowed. It can be freely stretched and stretched once it has passed its maximum expansion and contraction to ensure the safe operation of the pipeline.

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