補(bu)償(chang)(chang)器(qi)(qi)習(xi)慣上也(ye)叫膨脹(zhang)節，或伸(shen)縮(suo)節。由構成其工(gong)作主體的(de)波紋管(guan)(guan)(guan)(guan)(guan)（一種彈性元件(jian)）和(he)端管(guan)(guan)(guan)(guan)(guan)、支(zhi)架、法蘭、導(dao)管(guan)(guan)(guan)(guan)(guan)等附件(jian)組成。 屬于一種補(bu)償(chang)(chang)元件(jian)。利用(yong)(yong)(yong)其工(gong)作主體波紋管(guan)(guan)(guan)(guan)(guan)的(de)有(you)效(xiao)伸(shen)縮(suo)變形，以吸收(shou)管(guan)(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)(guan)、容(rong)器(qi)(qi)等由熱脹(zhang)冷縮(suo)等原(yuan)因而(er)產生(sheng)的(de)尺寸(cun)變化，或補(bu)償(chang)(chang)管(guan)(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)(guan)、容(rong)器(qi)(qi)等的(de)軸(zhou)向(xiang)、橫向(xiang)和(he)角(jiao)向(xiang)位移(yi)。也(ye)可(ke)用(yong)(yong)(yong)于降噪(zao)減(jian)振(zhen)。在(zai)現代工(gong)業中用(yong)(yong)(yong)途(tu)廣泛。供熱上，為了防止供熱管(guan)(guan)(guan)(guan)(guan)道(dao)升(sheng)溫(wen)時，由于熱伸(shen)長或溫(wen)度應力而(er)引起管(guan)(guan)(guan)(guan)(guan)道(dao)變形或破壞(huai)，需(xu)要在(zai)管(guan)(guan)(guan)(guan)(guan)道(dao)上設(she)置補(bu)償(chang)(chang)器(qi)(qi)，以補(bu)償(chang)(chang)管(guan)(guan)(guan)(guan)(guan)道(dao)的(de)熱伸(shen)長，從而(er)減(jian)小(xiao)管(guan)(guan)(guan)(guan)(guan)壁的(de)應力和(he)作用(yong)(yong)(yong)在(zai)閥件(jian)或支(zhi)架結構上的(de)作用(yong)(yong)(yong)力。