補(bu)(bu)償器(qi)習慣上(shang)也(ye)叫膨脹節，或(huo)(huo)(huo)伸(shen)(shen)(shen)縮節。由構(gou)成其(qi)工(gong)作主體(ti)的波紋(wen)管(guan)(guan)(guan)（一(yi)種彈(dan)性元(yuan)件(jian)(jian)）和(he)端管(guan)(guan)(guan)、支(zhi)架(jia)、法蘭、導(dao)(dao)管(guan)(guan)(guan)等(deng)附件(jian)(jian)組成。 屬于(yu)(yu)一(yi)種補(bu)(bu)償元(yuan)件(jian)(jian)。利用(yong)(yong)其(qi)工(gong)作主體(ti)波紋(wen)管(guan)(guan)(guan)的有效伸(shen)(shen)(shen)縮變(bian)(bian)形(xing)(xing)，以吸收管(guan)(guan)(guan)線(xian)、導(dao)(dao)管(guan)(guan)(guan)、容(rong)器(qi)等(deng)由熱(re)脹冷縮等(deng)原因而(er)(er)產(chan)生的尺寸變(bian)(bian)化，或(huo)(huo)(huo)補(bu)(bu)償管(guan)(guan)(guan)線(xian)、導(dao)(dao)管(guan)(guan)(guan)、容(rong)器(qi)等(deng)的軸向(xiang)、橫向(xiang)和(he)角向(xiang)位(wei)移。也(ye)可用(yong)(yong)于(yu)(yu)降噪(zao)減振。在(zai)現代工(gong)業中用(yong)(yong)途廣泛。供熱(re)上(shang)，為(wei)了防止(zhi)供熱(re)管(guan)(guan)(guan)道(dao)升溫時，由于(yu)(yu)熱(re)伸(shen)(shen)(shen)長(chang)或(huo)(huo)(huo)溫度應力而(er)(er)引起管(guan)(guan)(guan)道(dao)變(bian)(bian)形(xing)(xing)或(huo)(huo)(huo)破壞，需要在(zai)管(guan)(guan)(guan)道(dao)上(shang)設置補(bu)(bu)償器(qi)，以補(bu)(bu)償管(guan)(guan)(guan)道(dao)的熱(re)伸(shen)(shen)(shen)長(chang)，從而(er)(er)減小管(guan)(guan)(guan)壁的應力和(he)作用(yong)(yong)在(zai)閥件(jian)(jian)或(huo)(huo)(huo)支(zhi)架(jia)結構(gou)上(shang)的作用(yong)(yong)力。