補(bu)償(chang)(chang)(chang)器習慣上(shang)也叫(jiao)膨脹節，或(huo)伸(shen)(shen)縮(suo)節。由(you)(you)構成(cheng)其(qi)工(gong)作主體的(de)波紋管(guan)(guan)(guan)(guan)(guan)（一種彈性元件(jian)(jian)）和(he)端管(guan)(guan)(guan)(guan)(guan)、支(zhi)架、法蘭、導管(guan)(guan)(guan)(guan)(guan)等附件(jian)(jian)組成(cheng)。 屬于(yu)一種補(bu)償(chang)(chang)(chang)元件(jian)(jian)。利用(yong)其(qi)工(gong)作主體波紋管(guan)(guan)(guan)(guan)(guan)的(de)有效(xiao)伸(shen)(shen)縮(suo)變形，以(yi)吸(xi)收管(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)、容器等由(you)(you)熱(re)脹冷縮(suo)等原因而(er)產(chan)生的(de)尺寸變化，或(huo)補(bu)償(chang)(chang)(chang)管(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)、容器等的(de)軸向(xiang)、橫向(xiang)和(he)角(jiao)向(xiang)位移。也可用(yong)于(yu)降噪減(jian)振。在現代工(gong)業中用(yong)途廣泛。供(gong)熱(re)上(shang)，為(wei)了防止供(gong)熱(re)管(guan)(guan)(guan)(guan)(guan)道(dao)升溫時(shi)，由(you)(you)于(yu)熱(re)伸(shen)(shen)長或(huo)溫度應力(li)(li)而(er)引(yin)起管(guan)(guan)(guan)(guan)(guan)道(dao)變形或(huo)破(po)壞，需要(yao)在管(guan)(guan)(guan)(guan)(guan)道(dao)上(shang)設置補(bu)償(chang)(chang)(chang)器，以(yi)補(bu)償(chang)(chang)(chang)管(guan)(guan)(guan)(guan)(guan)道(dao)的(de)熱(re)伸(shen)(shen)長，從而(er)減(jian)小(xiao)管(guan)(guan)(guan)(guan)(guan)壁的(de)應力(li)(li)和(he)作用(yong)在閥件(jian)(jian)或(huo)支(zhi)架結構上(shang)的(de)作用(yong)力(li)(li)。