補(bu)償(chang)(chang)器(qi)習慣上也(ye)叫(jiao)膨脹節，或(huo)(huo)伸(shen)縮(suo)(suo)節。由(you)(you)構成其工(gong)作(zuo)主體的(de)(de)(de)波紋(wen)管(guan)(guan)(guan)(guan)(guan)（一種彈性元件）和(he)端管(guan)(guan)(guan)(guan)(guan)、支架、法蘭、導(dao)管(guan)(guan)(guan)(guan)(guan)等(deng)(deng)附件組成。 屬于一種補(bu)償(chang)(chang)元件。利(li)用(yong)(yong)其工(gong)作(zuo)主體波紋(wen)管(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)有效伸(shen)縮(suo)(suo)變(bian)形(xing)，以吸收管(guan)(guan)(guan)(guan)(guan)線(xian)(xian)、導(dao)管(guan)(guan)(guan)(guan)(guan)、容器(qi)等(deng)(deng)由(you)(you)熱(re)(re)脹冷縮(suo)(suo)等(deng)(deng)原因(yin)而產生的(de)(de)(de)尺寸變(bian)化，或(huo)(huo)補(bu)償(chang)(chang)管(guan)(guan)(guan)(guan)(guan)線(xian)(xian)、導(dao)管(guan)(guan)(guan)(guan)(guan)、容器(qi)等(deng)(deng)的(de)(de)(de)軸向(xiang)、橫向(xiang)和(he)角向(xiang)位移。也(ye)可(ke)用(yong)(yong)于降(jiang)噪減振。在現代工(gong)業中用(yong)(yong)途(tu)廣泛。供(gong)熱(re)(re)上，為了防止供(gong)熱(re)(re)管(guan)(guan)(guan)(guan)(guan)道升溫(wen)時(shi)，由(you)(you)于熱(re)(re)伸(shen)長或(huo)(huo)溫(wen)度應力(li)而引(yin)起管(guan)(guan)(guan)(guan)(guan)道變(bian)形(xing)或(huo)(huo)破壞，需(xu)要在管(guan)(guan)(guan)(guan)(guan)道上設置補(bu)償(chang)(chang)器(qi)，以補(bu)償(chang)(chang)管(guan)(guan)(guan)(guan)(guan)道的(de)(de)(de)熱(re)(re)伸(shen)長，從而減小管(guan)(guan)(guan)(guan)(guan)壁的(de)(de)(de)應力(li)和(he)作(zuo)用(yong)(yong)在閥(fa)件或(huo)(huo)支架結(jie)構上的(de)(de)(de)作(zuo)用(yong)(yong)力(li)。