Universal bellows http://www.zlongjx.com/847.htm 
 Universal compensator consists of a corrugated pipe and two end over form. It is deformed by the flexible bellows to absorb the axial displacement of the fall line (also a small amount of lateral, angular displacement). Side to take over or straight pipe and pipe welding over; or re-welded on the flange and pipe flange connection. The small lever on the expansion joints are mainly rigid support during transport or as a product pre-deformation adjustment. It is not load-bearing parts. 

 Universal compensator structure is simple, low cost, and thus all possible places in the pipeline should be given priority consideration. 
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