補(bu)償(chang)(chang)器(qi)(qi)習慣上(shang)(shang)(shang)也(ye)叫膨脹節(jie)，或伸(shen)縮(suo)節(jie)。由(you)構成其(qi)工(gong)(gong)作(zuo)(zuo)主體(ti)的(de)(de)波紋管(guan)(guan)(guan)(guan)(guan)（一種彈性元(yuan)件(jian)）和(he)端管(guan)(guan)(guan)(guan)(guan)、支架(jia)、法(fa)蘭、導(dao)(dao)管(guan)(guan)(guan)(guan)(guan)等附件(jian)組(zu)成。 屬(shu)于(yu)一種補(bu)償(chang)(chang)元(yuan)件(jian)。利用(yong)其(qi)工(gong)(gong)作(zuo)(zuo)主體(ti)波紋管(guan)(guan)(guan)(guan)(guan)的(de)(de)有效伸(shen)縮(suo)變形，以(yi)吸收管(guan)(guan)(guan)(guan)(guan)線(xian)、導(dao)(dao)管(guan)(guan)(guan)(guan)(guan)、容(rong)器(qi)(qi)等由(you)熱脹冷縮(suo)等原因而產生的(de)(de)尺(chi)寸變化，或補(bu)償(chang)(chang)管(guan)(guan)(guan)(guan)(guan)線(xian)、導(dao)(dao)管(guan)(guan)(guan)(guan)(guan)、容(rong)器(qi)(qi)等的(de)(de)軸向(xiang)、橫(heng)向(xiang)和(he)角向(xiang)位移。也(ye)可用(yong)于(yu)降噪減振(zhen)。在現代工(gong)(gong)業中用(yong)途廣泛。供熱上(shang)(shang)(shang)，為了防止供熱管(guan)(guan)(guan)(guan)(guan)道(dao)升溫(wen)時(shi)，由(you)于(yu)熱伸(shen)長或溫(wen)度(du)應力而引起管(guan)(guan)(guan)(guan)(guan)道(dao)變形或破壞(huai)，需要在管(guan)(guan)(guan)(guan)(guan)道(dao)上(shang)(shang)(shang)設置補(bu)償(chang)(chang)器(qi)(qi)，以(yi)補(bu)償(chang)(chang)管(guan)(guan)(guan)(guan)(guan)道(dao)的(de)(de)熱伸(shen)長，從而減小管(guan)(guan)(guan)(guan)(guan)壁的(de)(de)應力和(he)作(zuo)(zuo)用(yong)在閥件(jian)或支架(jia)結構上(shang)(shang)(shang)的(de)(de)作(zuo)(zuo)用(yong)力。