補(bu)(bu)償(chang)器(qi)習(xi)慣上(shang)也(ye)叫(jiao)膨脹節，或(huo)伸縮節。由構(gou)成其工作(zuo)(zuo)主體(ti)的(de)(de)波紋管(guan)(guan)(guan)(guan)(guan)（一(yi)種彈性元(yuan)件(jian)）和(he)端(duan)管(guan)(guan)(guan)(guan)(guan)、支(zhi)架(jia)(jia)、法(fa)蘭、導(dao)(dao)管(guan)(guan)(guan)(guan)(guan)等(deng)附件(jian)組成。 屬于一(yi)種補(bu)(bu)償(chang)元(yuan)件(jian)。利用(yong)(yong)其工作(zuo)(zuo)主體(ti)波紋管(guan)(guan)(guan)(guan)(guan)的(de)(de)有(you)效伸縮變形，以(yi)吸收(shou)管(guan)(guan)(guan)(guan)(guan)線(xian)、導(dao)(dao)管(guan)(guan)(guan)(guan)(guan)、容(rong)器(qi)等(deng)由熱(re)(re)脹冷縮等(deng)原因而(er)產生的(de)(de)尺寸變化，或(huo)補(bu)(bu)償(chang)管(guan)(guan)(guan)(guan)(guan)線(xian)、導(dao)(dao)管(guan)(guan)(guan)(guan)(guan)、容(rong)器(qi)等(deng)的(de)(de)軸(zhou)向、橫向和(he)角向位移。也(ye)可用(yong)(yong)于降(jiang)噪減(jian)(jian)振。在現代工業中用(yong)(yong)途廣泛。供熱(re)(re)上(shang)，為了防止供熱(re)(re)管(guan)(guan)(guan)(guan)(guan)道(dao)升溫(wen)時，由于熱(re)(re)伸長或(huo)溫(wen)度應(ying)力(li)而(er)引起管(guan)(guan)(guan)(guan)(guan)道(dao)變形或(huo)破壞，需要在管(guan)(guan)(guan)(guan)(guan)道(dao)上(shang)設置補(bu)(bu)償(chang)器(qi)，以(yi)補(bu)(bu)償(chang)管(guan)(guan)(guan)(guan)(guan)道(dao)的(de)(de)熱(re)(re)伸長，從而(er)減(jian)(jian)小管(guan)(guan)(guan)(guan)(guan)壁的(de)(de)應(ying)力(li)和(he)作(zuo)(zuo)用(yong)(yong)在閥(fa)件(jian)或(huo)支(zhi)架(jia)(jia)結構(gou)上(shang)的(de)(de)作(zuo)(zuo)用(yong)(yong)力(li)。