補(bu)(bu)償(chang)(chang)(chang)器(qi)(qi)習慣上(shang)也(ye)叫(jiao)膨脹(zhang)節，或(huo)(huo)伸縮(suo)節。由(you)構(gou)成其(qi)工作主體的(de)波紋管(guan)(guan)(guan)(guan)（一種彈性元(yuan)件(jian)）和(he)端管(guan)(guan)(guan)(guan)、支架(jia)、法蘭、導(dao)管(guan)(guan)(guan)(guan)等(deng)附(fu)件(jian)組(zu)成。 屬于一種補(bu)(bu)償(chang)(chang)(chang)元(yuan)件(jian)。利用(yong)(yong)其(qi)工作主體波紋管(guan)(guan)(guan)(guan)的(de)有效(xiao)伸縮(suo)變形(xing)，以吸收(shou)管(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)、容器(qi)(qi)等(deng)由(you)熱(re)脹(zhang)冷縮(suo)等(deng)原因(yin)而(er)產生的(de)尺(chi)寸(cun)變化，或(huo)(huo)補(bu)(bu)償(chang)(chang)(chang)管(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)、容器(qi)(qi)等(deng)的(de)軸向、橫向和(he)角向位移。也(ye)可用(yong)(yong)于降噪(zao)減(jian)振。在(zai)現代工業(ye)中用(yong)(yong)途廣泛。供(gong)熱(re)上(shang)，為了防止(zhi)供(gong)熱(re)管(guan)(guan)(guan)(guan)道升溫(wen)(wen)時，由(you)于熱(re)伸長或(huo)(huo)溫(wen)(wen)度(du)應力而(er)引起管(guan)(guan)(guan)(guan)道變形(xing)或(huo)(huo)破(po)壞，需要在(zai)管(guan)(guan)(guan)(guan)道上(shang)設置補(bu)(bu)償(chang)(chang)(chang)器(qi)(qi)，以補(bu)(bu)償(chang)(chang)(chang)管(guan)(guan)(guan)(guan)道的(de)熱(re)伸長，從而(er)減(jian)小管(guan)(guan)(guan)(guan)壁的(de)應力和(he)作用(yong)(yong)在(zai)閥件(jian)或(huo)(huo)支架(jia)結(jie)構(gou)上(shang)的(de)作用(yong)(yong)力。