補(bu)(bu)償器(qi)習(xi)慣(guan)上也(ye)(ye)叫膨(peng)脹節(jie)，或(huo)伸縮(suo)節(jie)。由(you)(you)構成其工(gong)作(zuo)主體(ti)的(de)波(bo)紋管(guan)(guan)(guan)(guan)（一種(zhong)彈(dan)性(xing)元件(jian)）和端管(guan)(guan)(guan)(guan)、支架(jia)、法蘭(lan)、導管(guan)(guan)(guan)(guan)等附(fu)件(jian)組成。 屬(shu)于一種(zhong)補(bu)(bu)償元件(jian)。利(li)用(yong)(yong)其工(gong)作(zuo)主體(ti)波(bo)紋管(guan)(guan)(guan)(guan)的(de)有效伸縮(suo)變形，以(yi)(yi)吸收管(guan)(guan)(guan)(guan)線(xian)(xian)、導管(guan)(guan)(guan)(guan)、容器(qi)等由(you)(you)熱(re)脹冷(leng)縮(suo)等原因而產生(sheng)的(de)尺寸變化，或(huo)補(bu)(bu)償管(guan)(guan)(guan)(guan)線(xian)(xian)、導管(guan)(guan)(guan)(guan)、容器(qi)等的(de)軸向、橫向和角(jiao)向位移。也(ye)(ye)可(ke)用(yong)(yong)于降噪減振。在現代工(gong)業(ye)中(zhong)用(yong)(yong)途廣泛。供(gong)熱(re)上，為(wei)了(le)防止供(gong)熱(re)管(guan)(guan)(guan)(guan)道(dao)升溫時，由(you)(you)于熱(re)伸長或(huo)溫度應力而引起管(guan)(guan)(guan)(guan)道(dao)變形或(huo)破壞，需要在管(guan)(guan)(guan)(guan)道(dao)上設置補(bu)(bu)償器(qi)，以(yi)(yi)補(bu)(bu)償管(guan)(guan)(guan)(guan)道(dao)的(de)熱(re)伸長，從而減小管(guan)(guan)(guan)(guan)壁的(de)應力和作(zuo)用(yong)(yong)在閥(fa)件(jian)或(huo)支架(jia)結構上的(de)作(zuo)用(yong)(yong)力。