補(bu)償(chang)(chang)器(qi)習(xi)慣上也(ye)叫膨(peng)脹節，或伸縮節。由(you)構成其工作(zuo)(zuo)主(zhu)體的波(bo)紋(wen)管(guan)(guan)(guan)（一種(zhong)彈性元件(jian)）和端管(guan)(guan)(guan)、支架(jia)、法蘭、導(dao)管(guan)(guan)(guan)等附件(jian)組(zu)成。 屬于一種(zhong)補(bu)償(chang)(chang)元件(jian)。利用(yong)(yong)其工作(zuo)(zuo)主(zhu)體波(bo)紋(wen)管(guan)(guan)(guan)的有效伸縮變形(xing)，以吸收管(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)、容(rong)(rong)器(qi)等由(you)熱脹冷縮等原因而產生的尺寸(cun)變化(hua)，或補(bu)償(chang)(chang)管(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)、容(rong)(rong)器(qi)等的軸向(xiang)、橫(heng)向(xiang)和角向(xiang)位(wei)移。也(ye)可用(yong)(yong)于降噪(zao)減(jian)振。在現代工業中(zhong)用(yong)(yong)途廣泛。供(gong)熱上，為(wei)了(le)防(fang)止供(gong)熱管(guan)(guan)(guan)道(dao)升溫時，由(you)于熱伸長或溫度應力而引起管(guan)(guan)(guan)道(dao)變形(xing)或破(po)壞，需要在管(guan)(guan)(guan)道(dao)上設置補(bu)償(chang)(chang)器(qi)，以補(bu)償(chang)(chang)管(guan)(guan)(guan)道(dao)的熱伸長，從而減(jian)小管(guan)(guan)(guan)壁的應力和作(zuo)(zuo)用(yong)(yong)在閥件(jian)或支架(jia)結(jie)構上的作(zuo)(zuo)用(yong)(yong)力。