補(bu)償器(qi)習(xi)慣上(shang)也(ye)叫膨脹節，或(huo)(huo)(huo)伸(shen)縮(suo)(suo)節。由(you)構成其(qi)(qi)工(gong)作主體的(de)(de)(de)(de)波(bo)紋管(guan)(guan)(guan)(guan)(guan)(guan)(guan)（一(yi)種彈性元件(jian)）和(he)端管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、支架、法蘭、導(dao)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)等附(fu)件(jian)組成。 屬(shu)于(yu)一(yi)種補(bu)償元件(jian)。利用(yong)(yong)其(qi)(qi)工(gong)作主體波(bo)紋管(guan)(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)(de)有效伸(shen)縮(suo)(suo)變形，以吸收管(guan)(guan)(guan)(guan)(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、容器(qi)等由(you)熱(re)脹冷縮(suo)(suo)等原因而(er)產生的(de)(de)(de)(de)尺寸(cun)變化，或(huo)(huo)(huo)補(bu)償管(guan)(guan)(guan)(guan)(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、容器(qi)等的(de)(de)(de)(de)軸向、橫向和(he)角向位(wei)移(yi)。也(ye)可用(yong)(yong)于(yu)降噪減(jian)振。在(zai)現代工(gong)業中(zhong)用(yong)(yong)途(tu)廣泛(fan)。供(gong)熱(re)上(shang)，為了(le)防(fang)止供(gong)熱(re)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道(dao)升(sheng)溫時，由(you)于(yu)熱(re)伸(shen)長(chang)(chang)或(huo)(huo)(huo)溫度應力而(er)引起(qi)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道(dao)變形或(huo)(huo)(huo)破(po)壞，需要在(zai)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道(dao)上(shang)設置補(bu)償器(qi)，以補(bu)償管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道(dao)的(de)(de)(de)(de)熱(re)伸(shen)長(chang)(chang)，從而(er)減(jian)小管(guan)(guan)(guan)(guan)(guan)(guan)(guan)壁的(de)(de)(de)(de)應力和(he)作用(yong)(yong)在(zai)閥件(jian)或(huo)(huo)(huo)支架結(jie)構上(shang)的(de)(de)(de)(de)作用(yong)(yong)力。