補償(chang)(chang)器習慣(guan)上(shang)也(ye)叫膨(peng)脹節，或(huo)伸(shen)縮節。由構(gou)成其工作(zuo)主體的(de)(de)(de)波紋管(guan)(guan)(guan)(guan)（一種(zhong)彈性元(yuan)件(jian)）和端管(guan)(guan)(guan)(guan)、支架、法蘭(lan)、導(dao)管(guan)(guan)(guan)(guan)等(deng)附件(jian)組成。 屬于(yu)(yu)一種(zhong)補償(chang)(chang)元(yuan)件(jian)。利用(yong)(yong)(yong)其工作(zuo)主體波紋管(guan)(guan)(guan)(guan)的(de)(de)(de)有效伸(shen)縮變(bian)形，以吸收管(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)、容(rong)器等(deng)由熱(re)脹冷(leng)縮等(deng)原(yuan)因(yin)而(er)產(chan)生(sheng)的(de)(de)(de)尺寸(cun)變(bian)化(hua)，或(huo)補償(chang)(chang)管(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)、容(rong)器等(deng)的(de)(de)(de)軸向(xiang)、橫向(xiang)和角向(xiang)位移。也(ye)可用(yong)(yong)(yong)于(yu)(yu)降噪(zao)減振(zhen)。在(zai)現代工業中(zhong)用(yong)(yong)(yong)途廣泛。供(gong)熱(re)上(shang)，為(wei)了防止(zhi)供(gong)熱(re)管(guan)(guan)(guan)(guan)道(dao)(dao)升溫時，由于(yu)(yu)熱(re)伸(shen)長(chang)或(huo)溫度應力而(er)引(yin)起管(guan)(guan)(guan)(guan)道(dao)(dao)變(bian)形或(huo)破壞，需(xu)要在(zai)管(guan)(guan)(guan)(guan)道(dao)(dao)上(shang)設置補償(chang)(chang)器，以補償(chang)(chang)管(guan)(guan)(guan)(guan)道(dao)(dao)的(de)(de)(de)熱(re)伸(shen)長(chang)，從而(er)減小管(guan)(guan)(guan)(guan)壁的(de)(de)(de)應力和作(zuo)用(yong)(yong)(yong)在(zai)閥件(jian)或(huo)支架結構(gou)上(shang)的(de)(de)(de)作(zuo)用(yong)(yong)(yong)力。