補(bu)償(chang)器(qi)習(xi)慣上也叫膨(peng)脹節，或(huo)伸(shen)(shen)縮(suo)節。由(you)(you)構成其工作(zuo)主體(ti)的(de)波(bo)紋管(guan)(guan)(guan)(guan)（一種彈性元件(jian)）和(he)端(duan)管(guan)(guan)(guan)(guan)、支(zhi)架、法(fa)蘭、導(dao)管(guan)(guan)(guan)(guan)等(deng)附件(jian)組(zu)成。 屬于一種補(bu)償(chang)元件(jian)。利用(yong)(yong)其工作(zuo)主體(ti)波(bo)紋管(guan)(guan)(guan)(guan)的(de)有效伸(shen)(shen)縮(suo)變(bian)(bian)形(xing)，以吸收管(guan)(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)(guan)、容(rong)器(qi)等(deng)由(you)(you)熱脹冷縮(suo)等(deng)原(yuan)因而(er)產生的(de)尺寸(cun)變(bian)(bian)化，或(huo)補(bu)償(chang)管(guan)(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)(guan)、容(rong)器(qi)等(deng)的(de)軸向、橫向和(he)角向位(wei)移。也可(ke)用(yong)(yong)于降(jiang)噪減振。在(zai)(zai)(zai)現代工業(ye)中用(yong)(yong)途廣泛。供(gong)熱上，為了防止供(gong)熱管(guan)(guan)(guan)(guan)道(dao)(dao)升溫時，由(you)(you)于熱伸(shen)(shen)長或(huo)溫度應(ying)力而(er)引起(qi)管(guan)(guan)(guan)(guan)道(dao)(dao)變(bian)(bian)形(xing)或(huo)破壞，需要在(zai)(zai)(zai)管(guan)(guan)(guan)(guan)道(dao)(dao)上設置補(bu)償(chang)器(qi)，以補(bu)償(chang)管(guan)(guan)(guan)(guan)道(dao)(dao)的(de)熱伸(shen)(shen)長，從而(er)減小(xiao)管(guan)(guan)(guan)(guan)壁的(de)應(ying)力和(he)作(zuo)用(yong)(yong)在(zai)(zai)(zai)閥件(jian)或(huo)支(zhi)架結構上的(de)作(zuo)用(yong)(yong)力。