補償(chang)器(qi)習慣(guan)上也(ye)叫(jiao)膨脹(zhang)節，或(huo)伸(shen)縮(suo)節。由構成其工(gong)作(zuo)主體的波紋(wen)(wen)管(guan)(guan)(guan)（一種彈(dan)性元(yuan)件(jian)）和(he)端管(guan)(guan)(guan)、支架(jia)、法蘭、導(dao)管(guan)(guan)(guan)等附件(jian)組成。 屬(shu)于(yu)一種補償(chang)元(yuan)件(jian)。利(li)用(yong)(yong)其工(gong)作(zuo)主體波紋(wen)(wen)管(guan)(guan)(guan)的有效伸(shen)縮(suo)變形，以(yi)(yi)吸收管(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)、容(rong)器(qi)等由熱脹(zhang)冷縮(suo)等原因而(er)產生的尺寸(cun)變化，或(huo)補償(chang)管(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)、容(rong)器(qi)等的軸向、橫(heng)向和(he)角向位移。也(ye)可用(yong)(yong)于(yu)降噪(zao)減(jian)(jian)振。在現代工(gong)業(ye)中用(yong)(yong)途廣泛。供熱上，為了防止(zhi)供熱管(guan)(guan)(guan)道(dao)(dao)升溫時，由于(yu)熱伸(shen)長(chang)或(huo)溫度應力而(er)引(yin)起管(guan)(guan)(guan)道(dao)(dao)變形或(huo)破壞，需要在管(guan)(guan)(guan)道(dao)(dao)上設置補償(chang)器(qi)，以(yi)(yi)補償(chang)管(guan)(guan)(guan)道(dao)(dao)的熱伸(shen)長(chang)，從而(er)減(jian)(jian)小管(guan)(guan)(guan)壁的應力和(he)作(zuo)用(yong)(yong)在閥(fa)件(jian)或(huo)支架(jia)結構上的作(zuo)用(yong)(yong)力。