補(bu)(bu)償器習慣上(shang)也叫膨脹節(jie)，或伸縮(suo)節(jie)。由(you)構成(cheng)其工(gong)作(zuo)主體的(de)波紋(wen)管(guan)(guan)(guan)(guan)（一種(zhong)彈性元(yuan)件(jian)(jian)）和(he)端管(guan)(guan)(guan)(guan)、支架、法蘭、導管(guan)(guan)(guan)(guan)等附(fu)件(jian)(jian)組成(cheng)。 屬于(yu)一種(zhong)補(bu)(bu)償元(yuan)件(jian)(jian)。利用(yong)(yong)其工(gong)作(zuo)主體波紋(wen)管(guan)(guan)(guan)(guan)的(de)有效伸縮(suo)變形，以吸(xi)收管(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)、容(rong)器等由(you)熱(re)脹冷縮(suo)等原因而(er)(er)產生的(de)尺寸變化，或補(bu)(bu)償管(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)、容(rong)器等的(de)軸向(xiang)(xiang)、橫向(xiang)(xiang)和(he)角向(xiang)(xiang)位移(yi)。也可用(yong)(yong)于(yu)降(jiang)噪減振。在(zai)現代工(gong)業中用(yong)(yong)途(tu)廣泛。供熱(re)上(shang)，為了防(fang)止供熱(re)管(guan)(guan)(guan)(guan)道(dao)(dao)升(sheng)溫時(shi)，由(you)于(yu)熱(re)伸長或溫度應(ying)力而(er)(er)引起管(guan)(guan)(guan)(guan)道(dao)(dao)變形或破壞(huai)，需要在(zai)管(guan)(guan)(guan)(guan)道(dao)(dao)上(shang)設置補(bu)(bu)償器，以補(bu)(bu)償管(guan)(guan)(guan)(guan)道(dao)(dao)的(de)熱(re)伸長，從而(er)(er)減小管(guan)(guan)(guan)(guan)壁的(de)應(ying)力和(he)作(zuo)用(yong)(yong)在(zai)閥件(jian)(jian)或支架結構上(shang)的(de)作(zuo)用(yong)(yong)力。