補(bu)償(chang)(chang)器習(xi)慣上也(ye)叫膨(peng)脹(zhang)節，或(huo)伸(shen)縮節。由(you)構成(cheng)其(qi)工(gong)作主(zhu)體的波紋管(guan)(guan)(guan)（一種彈性元(yuan)件）和端管(guan)(guan)(guan)、支架、法蘭、導(dao)(dao)管(guan)(guan)(guan)等(deng)附件組成(cheng)。 屬于一種補(bu)償(chang)(chang)元(yuan)件。利用(yong)其(qi)工(gong)作主(zhu)體波紋管(guan)(guan)(guan)的有(you)效(xiao)伸(shen)縮變形，以吸收管(guan)(guan)(guan)線、導(dao)(dao)管(guan)(guan)(guan)、容器等(deng)由(you)熱(re)脹(zhang)冷縮等(deng)原(yuan)因而(er)產生的尺寸變化，或(huo)補(bu)償(chang)(chang)管(guan)(guan)(guan)線、導(dao)(dao)管(guan)(guan)(guan)、容器等(deng)的軸向、橫向和角向位移。也(ye)可用(yong)于降噪減振。在現代工(gong)業中用(yong)途廣泛。供(gong)熱(re)上，為了(le)防止供(gong)熱(re)管(guan)(guan)(guan)道(dao)(dao)升溫時(shi)，由(you)于熱(re)伸(shen)長或(huo)溫度應力而(er)引起管(guan)(guan)(guan)道(dao)(dao)變形或(huo)破(po)壞，需要在管(guan)(guan)(guan)道(dao)(dao)上設置補(bu)償(chang)(chang)器，以補(bu)償(chang)(chang)管(guan)(guan)(guan)道(dao)(dao)的熱(re)伸(shen)長，從而(er)減小管(guan)(guan)(guan)壁的應力和作用(yong)在閥件或(huo)支架結構上的作用(yong)力。