補償器習慣(guan)上(shang)也(ye)叫膨脹節，或伸(shen)(shen)縮(suo)(suo)節。由(you)構(gou)成其工(gong)作(zuo)主(zhu)(zhu)體(ti)的(de)波紋管(guan)(guan)(guan)(guan)(guan)(guan)（一種彈性元件(jian)）和端管(guan)(guan)(guan)(guan)(guan)(guan)、支(zhi)架(jia)、法蘭、導管(guan)(guan)(guan)(guan)(guan)(guan)等附件(jian)組成。 屬于一種補償元件(jian)。利用(yong)其工(gong)作(zuo)主(zhu)(zhu)體(ti)波紋管(guan)(guan)(guan)(guan)(guan)(guan)的(de)有(you)效伸(shen)(shen)縮(suo)(suo)變(bian)形，以吸收(shou)管(guan)(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)(guan)、容器等由(you)熱(re)(re)(re)脹冷(leng)縮(suo)(suo)等原(yuan)因而(er)產生的(de)尺寸變(bian)化，或補償管(guan)(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)(guan)、容器等的(de)軸向、橫(heng)向和角向位移。也(ye)可用(yong)于降噪減振。在現代工(gong)業(ye)中用(yong)途廣泛。供熱(re)(re)(re)上(shang)，為了防止供熱(re)(re)(re)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)(dao)升溫(wen)時，由(you)于熱(re)(re)(re)伸(shen)(shen)長或溫(wen)度(du)應(ying)力而(er)引起管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)(dao)變(bian)形或破(po)壞，需要(yao)在管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)(dao)上(shang)設置補償器，以補償管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)(dao)的(de)熱(re)(re)(re)伸(shen)(shen)長，從而(er)減小管(guan)(guan)(guan)(guan)(guan)(guan)壁的(de)應(ying)力和作(zuo)用(yong)在閥件(jian)或支(zhi)架(jia)結構(gou)上(shang)的(de)作(zuo)用(yong)力。