補(bu)(bu)償器習慣上也(ye)叫膨脹節，或(huo)(huo)伸(shen)(shen)(shen)縮(suo)(suo)節。由(you)構成(cheng)其工(gong)(gong)作主體的(de)波紋(wen)管(guan)(guan)(guan)(guan)（一種彈性元件(jian)(jian)(jian)）和端(duan)管(guan)(guan)(guan)(guan)、支(zhi)架(jia)、法蘭(lan)、導(dao)管(guan)(guan)(guan)(guan)等附件(jian)(jian)(jian)組成(cheng)。 屬(shu)于一種補(bu)(bu)償元件(jian)(jian)(jian)。利用其工(gong)(gong)作主體波紋(wen)管(guan)(guan)(guan)(guan)的(de)有效(xiao)伸(shen)(shen)(shen)縮(suo)(suo)變形，以吸收(shou)管(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)、容(rong)器等由(you)熱(re)脹冷縮(suo)(suo)等原因而產(chan)生的(de)尺寸變化，或(huo)(huo)補(bu)(bu)償管(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)、容(rong)器等的(de)軸向、橫(heng)向和角向位移(yi)。也(ye)可(ke)用于降噪減(jian)振。在現(xian)代工(gong)(gong)業中用途廣泛。供(gong)熱(re)上，為了防(fang)止(zhi)供(gong)熱(re)管(guan)(guan)(guan)(guan)道(dao)升溫時，由(you)于熱(re)伸(shen)(shen)(shen)長或(huo)(huo)溫度(du)應(ying)力而引起管(guan)(guan)(guan)(guan)道(dao)變形或(huo)(huo)破壞，需要在管(guan)(guan)(guan)(guan)道(dao)上設(she)置(zhi)補(bu)(bu)償器，以補(bu)(bu)償管(guan)(guan)(guan)(guan)道(dao)的(de)熱(re)伸(shen)(shen)(shen)長，從而減(jian)小管(guan)(guan)(guan)(guan)壁的(de)應(ying)力和作用在閥件(jian)(jian)(jian)或(huo)(huo)支(zhi)架(jia)結(jie)構上的(de)作用力。