補(bu)償器(qi)(qi)習慣上(shang)也(ye)叫膨(peng)脹節，或(huo)伸縮節。由構成其工(gong)(gong)作(zuo)主體的(de)(de)波紋管(guan)(guan)（一種(zhong)彈性元(yuan)件(jian)(jian)）和端(duan)管(guan)(guan)、支架(jia)、法蘭、導管(guan)(guan)等(deng)附件(jian)(jian)組(zu)成。 屬于(yu)(yu)一種(zhong)補(bu)償元(yuan)件(jian)(jian)。利用(yong)(yong)(yong)其工(gong)(gong)作(zuo)主體波紋管(guan)(guan)的(de)(de)有效伸縮變(bian)形，以吸(xi)收管(guan)(guan)線、導管(guan)(guan)、容(rong)器(qi)(qi)等(deng)由熱(re)脹冷縮等(deng)原因而產生的(de)(de)尺寸變(bian)化，或(huo)補(bu)償管(guan)(guan)線、導管(guan)(guan)、容(rong)器(qi)(qi)等(deng)的(de)(de)軸向、橫向和角向位(wei)移。也(ye)可用(yong)(yong)(yong)于(yu)(yu)降噪(zao)減(jian)振。在現代(dai)工(gong)(gong)業中用(yong)(yong)(yong)途(tu)廣泛(fan)。供(gong)熱(re)上(shang)，為了防止(zhi)供(gong)熱(re)管(guan)(guan)道升溫時，由于(yu)(yu)熱(re)伸長或(huo)溫度應(ying)力(li)而引起管(guan)(guan)道變(bian)形或(huo)破壞(huai)，需要(yao)在管(guan)(guan)道上(shang)設(she)置補(bu)償器(qi)(qi)，以補(bu)償管(guan)(guan)道的(de)(de)熱(re)伸長，從(cong)而減(jian)小管(guan)(guan)壁的(de)(de)應(ying)力(li)和作(zuo)用(yong)(yong)(yong)在閥(fa)件(jian)(jian)或(huo)支架(jia)結構上(shang)的(de)(de)作(zuo)用(yong)(yong)(yong)力(li)。