補償(chang)(chang)器習慣(guan)上(shang)(shang)也(ye)叫膨脹(zhang)節，或伸(shen)(shen)縮(suo)節。由(you)(you)構成其(qi)工(gong)作(zuo)主(zhu)體(ti)的(de)波(bo)紋(wen)管(guan)(guan)(guan)(guan)（一(yi)種彈性元件(jian)(jian)）和(he)端管(guan)(guan)(guan)(guan)、支(zhi)架(jia)、法蘭(lan)、導(dao)管(guan)(guan)(guan)(guan)等附件(jian)(jian)組成。 屬(shu)于(yu)一(yi)種補償(chang)(chang)元件(jian)(jian)。利(li)用(yong)其(qi)工(gong)作(zuo)主(zhu)體(ti)波(bo)紋(wen)管(guan)(guan)(guan)(guan)的(de)有(you)效伸(shen)(shen)縮(suo)變(bian)(bian)形，以(yi)(yi)吸收管(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)、容器等由(you)(you)熱(re)(re)(re)脹(zhang)冷(leng)縮(suo)等原因而(er)(er)產生的(de)尺(chi)寸變(bian)(bian)化(hua)，或補償(chang)(chang)管(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)、容器等的(de)軸向、橫向和(he)角向位移。也(ye)可用(yong)于(yu)降噪減振。在(zai)現代工(gong)業(ye)中用(yong)途廣泛。供熱(re)(re)(re)上(shang)(shang)，為了防止供熱(re)(re)(re)管(guan)(guan)(guan)(guan)道(dao)升溫(wen)時，由(you)(you)于(yu)熱(re)(re)(re)伸(shen)(shen)長或溫(wen)度應(ying)力而(er)(er)引起管(guan)(guan)(guan)(guan)道(dao)變(bian)(bian)形或破壞，需要在(zai)管(guan)(guan)(guan)(guan)道(dao)上(shang)(shang)設置補償(chang)(chang)器，以(yi)(yi)補償(chang)(chang)管(guan)(guan)(guan)(guan)道(dao)的(de)熱(re)(re)(re)伸(shen)(shen)長，從而(er)(er)減小管(guan)(guan)(guan)(guan)壁(bi)的(de)應(ying)力和(he)作(zuo)用(yong)在(zai)閥件(jian)(jian)或支(zhi)架(jia)結構上(shang)(shang)的(de)作(zuo)用(yong)力。