Because the pipe environment requires great amount of stretching the use of this type of cover-type one-way shock wave absorber which combine multiple Bellows,without internal pressure effect caused by elongation, and is suitable for large displacement compensation amount absorbed,but also play the effectiveness of the protection of the pipeline to achieve the best effect. It applies to important pipeline drainage, air conditioning fire and so on. To the horizontal drainage and fire water pipe or tube of seismic design riser inside the building. Installed in the limited space of a single line of large angular displacement.