補(bu)(bu)(bu)償(chang)器(qi)習慣(guan)上(shang)也叫膨(peng)脹(zhang)節，或(huo)(huo)伸(shen)(shen)(shen)縮節。由(you)構成其(qi)工(gong)作(zuo)主(zhu)(zhu)體的(de)(de)波紋管(guan)(guan)(guan)（一(yi)種(zhong)彈性元件(jian)）和端管(guan)(guan)(guan)、支架(jia)、法蘭(lan)、導(dao)管(guan)(guan)(guan)等附件(jian)組成。 屬于(yu)一(yi)種(zhong)補(bu)(bu)(bu)償(chang)元件(jian)。利用(yong)(yong)(yong)其(qi)工(gong)作(zuo)主(zhu)(zhu)體波紋管(guan)(guan)(guan)的(de)(de)有效伸(shen)(shen)(shen)縮變形(xing)(xing)，以吸收(shou)管(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)、容(rong)器(qi)等由(you)熱(re)(re)(re)脹(zhang)冷縮等原因而產生的(de)(de)尺(chi)寸變化，或(huo)(huo)補(bu)(bu)(bu)償(chang)管(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)、容(rong)器(qi)等的(de)(de)軸向、橫(heng)向和角向位移。也可用(yong)(yong)(yong)于(yu)降噪(zao)減(jian)(jian)振。在現代工(gong)業(ye)中用(yong)(yong)(yong)途廣泛。供(gong)熱(re)(re)(re)上(shang)，為了防止供(gong)熱(re)(re)(re)管(guan)(guan)(guan)道(dao)(dao)(dao)升溫時，由(you)于(yu)熱(re)(re)(re)伸(shen)(shen)(shen)長(chang)或(huo)(huo)溫度應力而引起管(guan)(guan)(guan)道(dao)(dao)(dao)變形(xing)(xing)或(huo)(huo)破壞(huai)，需(xu)要在管(guan)(guan)(guan)道(dao)(dao)(dao)上(shang)設置補(bu)(bu)(bu)償(chang)器(qi)，以補(bu)(bu)(bu)償(chang)管(guan)(guan)(guan)道(dao)(dao)(dao)的(de)(de)熱(re)(re)(re)伸(shen)(shen)(shen)長(chang)，從而減(jian)(jian)小管(guan)(guan)(guan)壁的(de)(de)應力和作(zuo)用(yong)(yong)(yong)在閥(fa)件(jian)或(huo)(huo)支架(jia)結(jie)構上(shang)的(de)(de)作(zuo)用(yong)(yong)(yong)力。