補(bu)償器(qi)(qi)習慣上(shang)也(ye)叫膨(peng)脹(zhang)節(jie)，或(huo)伸(shen)(shen)縮(suo)節(jie)。由(you)構成其工作主體的(de)(de)波紋(wen)管(guan)(guan)(guan)(guan)(guan)（一種(zhong)彈性元件(jian)）和端管(guan)(guan)(guan)(guan)(guan)、支架、法蘭、導(dao)(dao)管(guan)(guan)(guan)(guan)(guan)等(deng)附件(jian)組成。 屬于(yu)一種(zhong)補(bu)償元件(jian)。利用(yong)(yong)其工作主體波紋(wen)管(guan)(guan)(guan)(guan)(guan)的(de)(de)有效(xiao)伸(shen)(shen)縮(suo)變(bian)形，以吸(xi)收管(guan)(guan)(guan)(guan)(guan)線(xian)、導(dao)(dao)管(guan)(guan)(guan)(guan)(guan)、容(rong)器(qi)(qi)等(deng)由(you)熱(re)脹(zhang)冷(leng)縮(suo)等(deng)原因而(er)(er)產生的(de)(de)尺寸變(bian)化(hua)，或(huo)補(bu)償管(guan)(guan)(guan)(guan)(guan)線(xian)、導(dao)(dao)管(guan)(guan)(guan)(guan)(guan)、容(rong)器(qi)(qi)等(deng)的(de)(de)軸向、橫向和角向位(wei)移(yi)。也(ye)可(ke)用(yong)(yong)于(yu)降噪減振。在現代工業中用(yong)(yong)途廣泛。供熱(re)上(shang)，為了防(fang)止供熱(re)管(guan)(guan)(guan)(guan)(guan)道(dao)升溫時，由(you)于(yu)熱(re)伸(shen)(shen)長或(huo)溫度應力(li)而(er)(er)引起管(guan)(guan)(guan)(guan)(guan)道(dao)變(bian)形或(huo)破壞(huai)，需要在管(guan)(guan)(guan)(guan)(guan)道(dao)上(shang)設置補(bu)償器(qi)(qi)，以補(bu)償管(guan)(guan)(guan)(guan)(guan)道(dao)的(de)(de)熱(re)伸(shen)(shen)長，從而(er)(er)減小管(guan)(guan)(guan)(guan)(guan)壁的(de)(de)應力(li)和作用(yong)(yong)在閥件(jian)或(huo)支架結(jie)構上(shang)的(de)(de)作用(yong)(yong)力(li)。