補償(chang)器(qi)習慣上也叫膨(peng)脹(zhang)節(jie)，或(huo)伸縮(suo)節(jie)。由構成(cheng)其工(gong)作(zuo)主體(ti)的波(bo)紋(wen)管(guan)(guan)(guan)(guan)(guan)（一(yi)種彈性(xing)元件(jian)(jian)(jian)）和(he)端管(guan)(guan)(guan)(guan)(guan)、支架、法蘭、導(dao)管(guan)(guan)(guan)(guan)(guan)等(deng)附件(jian)(jian)(jian)組成(cheng)。 屬于一(yi)種補償(chang)元件(jian)(jian)(jian)。利用(yong)(yong)其工(gong)作(zuo)主體(ti)波(bo)紋(wen)管(guan)(guan)(guan)(guan)(guan)的有效伸縮(suo)變形(xing)，以吸收(shou)管(guan)(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)(guan)、容(rong)器(qi)等(deng)由熱脹(zhang)冷縮(suo)等(deng)原因而(er)(er)產生的尺寸變化，或(huo)補償(chang)管(guan)(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)(guan)、容(rong)器(qi)等(deng)的軸向、橫(heng)向和(he)角向位移(yi)。也可用(yong)(yong)于降噪(zao)減振。在現代(dai)工(gong)業(ye)中用(yong)(yong)途廣泛。供熱上，為了防止供熱管(guan)(guan)(guan)(guan)(guan)道升溫時，由于熱伸長或(huo)溫度應力(li)而(er)(er)引起管(guan)(guan)(guan)(guan)(guan)道變形(xing)或(huo)破壞(huai)，需要在管(guan)(guan)(guan)(guan)(guan)道上設置(zhi)補償(chang)器(qi)，以補償(chang)管(guan)(guan)(guan)(guan)(guan)道的熱伸長，從而(er)(er)減小管(guan)(guan)(guan)(guan)(guan)壁的應力(li)和(he)作(zuo)用(yong)(yong)在閥件(jian)(jian)(jian)或(huo)支架結(jie)構上的作(zuo)用(yong)(yong)力(li)。