補(bu)償器習慣上(shang)也(ye)叫膨脹節(jie)(jie)，或(huo)伸(shen)縮(suo)節(jie)(jie)。由(you)(you)構成(cheng)其(qi)工(gong)作主(zhu)體的(de)(de)(de)波(bo)紋管(guan)(guan)(guan)(guan)（一種(zhong)彈性元件(jian)）和(he)端管(guan)(guan)(guan)(guan)、支架、法蘭、導管(guan)(guan)(guan)(guan)等附件(jian)組成(cheng)。 屬于一種(zhong)補(bu)償元件(jian)。利用(yong)(yong)(yong)(yong)其(qi)工(gong)作主(zhu)體波(bo)紋管(guan)(guan)(guan)(guan)的(de)(de)(de)有(you)效伸(shen)縮(suo)變(bian)形，以吸收(shou)管(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)、容器等由(you)(you)熱(re)脹冷縮(suo)等原因(yin)而(er)產生的(de)(de)(de)尺寸變(bian)化，或(huo)補(bu)償管(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)、容器等的(de)(de)(de)軸向(xiang)、橫向(xiang)和(he)角向(xiang)位移。也(ye)可用(yong)(yong)(yong)(yong)于降(jiang)噪減(jian)振(zhen)。在現代工(gong)業(ye)中(zhong)用(yong)(yong)(yong)(yong)途廣泛。供(gong)熱(re)上(shang)，為了防止(zhi)供(gong)熱(re)管(guan)(guan)(guan)(guan)道升溫時，由(you)(you)于熱(re)伸(shen)長或(huo)溫度應力(li)而(er)引起管(guan)(guan)(guan)(guan)道變(bian)形或(huo)破壞，需要在管(guan)(guan)(guan)(guan)道上(shang)設(she)置(zhi)補(bu)償器，以補(bu)償管(guan)(guan)(guan)(guan)道的(de)(de)(de)熱(re)伸(shen)長，從(cong)而(er)減(jian)小管(guan)(guan)(guan)(guan)壁的(de)(de)(de)應力(li)和(he)作用(yong)(yong)(yong)(yong)在閥件(jian)或(huo)支架結構上(shang)的(de)(de)(de)作用(yong)(yong)(yong)(yong)力(li)。