補(bu)償(chang)(chang)器習慣上也叫(jiao)膨脹(zhang)節(jie)(jie)，或(huo)(huo)伸(shen)縮(suo)節(jie)(jie)。由(you)(you)構(gou)成其工(gong)(gong)(gong)作(zuo)(zuo)主體(ti)的(de)(de)波紋管(guan)(guan)(guan)（一(yi)(yi)種彈性(xing)元件(jian)(jian)(jian)）和端(duan)管(guan)(guan)(guan)、支(zhi)架(jia)、法蘭(lan)、導(dao)管(guan)(guan)(guan)等附件(jian)(jian)(jian)組成。 屬于(yu)一(yi)(yi)種補(bu)償(chang)(chang)元件(jian)(jian)(jian)。利用(yong)其工(gong)(gong)(gong)作(zuo)(zuo)主體(ti)波紋管(guan)(guan)(guan)的(de)(de)有效伸(shen)縮(suo)變(bian)形(xing)，以(yi)吸(xi)收管(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)、容(rong)器等由(you)(you)熱(re)(re)脹(zhang)冷縮(suo)等原因而(er)(er)產生的(de)(de)尺(chi)寸變(bian)化(hua)，或(huo)(huo)補(bu)償(chang)(chang)管(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)、容(rong)器等的(de)(de)軸(zhou)向、橫(heng)向和角向位移(yi)。也可(ke)用(yong)于(yu)降噪減(jian)振(zhen)。在(zai)現代(dai)工(gong)(gong)(gong)業中用(yong)途廣泛。供(gong)熱(re)(re)上，為了防止供(gong)熱(re)(re)管(guan)(guan)(guan)道升溫(wen)時，由(you)(you)于(yu)熱(re)(re)伸(shen)長或(huo)(huo)溫(wen)度應力(li)而(er)(er)引起管(guan)(guan)(guan)道變(bian)形(xing)或(huo)(huo)破壞，需(xu)要在(zai)管(guan)(guan)(guan)道上設置補(bu)償(chang)(chang)器，以(yi)補(bu)償(chang)(chang)管(guan)(guan)(guan)道的(de)(de)熱(re)(re)伸(shen)長，從(cong)而(er)(er)減(jian)小管(guan)(guan)(guan)壁的(de)(de)應力(li)和作(zuo)(zuo)用(yong)在(zai)閥件(jian)(jian)(jian)或(huo)(huo)支(zhi)架(jia)結構(gou)上的(de)(de)作(zuo)(zuo)用(yong)力(li)。