補(bu)償器(qi)(qi)習慣(guan)上也(ye)叫(jiao)膨脹節，或伸(shen)縮(suo)節。由構成(cheng)其(qi)工作主體的波(bo)紋(wen)管(guan)(guan)(guan)(guan)(guan)(guan)（一種(zhong)彈性元件(jian)）和(he)(he)端管(guan)(guan)(guan)(guan)(guan)(guan)、支(zhi)(zhi)架、法蘭、導管(guan)(guan)(guan)(guan)(guan)(guan)等附件(jian)組成(cheng)。 屬于一種(zhong)補(bu)償元件(jian)。利(li)用(yong)其(qi)工作主體波(bo)紋(wen)管(guan)(guan)(guan)(guan)(guan)(guan)的有效(xiao)伸(shen)縮(suo)變(bian)形，以吸收管(guan)(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)(guan)、容(rong)器(qi)(qi)等由熱(re)(re)脹冷(leng)縮(suo)等原(yuan)因(yin)而產生的尺(chi)寸變(bian)化(hua)，或補(bu)償管(guan)(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)(guan)、容(rong)器(qi)(qi)等的軸向、橫向和(he)(he)角(jiao)向位移。也(ye)可用(yong)于降(jiang)噪減(jian)振(zhen)。在現代工業(ye)中用(yong)途廣泛。供熱(re)(re)上，為了防止供熱(re)(re)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)升溫(wen)時，由于熱(re)(re)伸(shen)長或溫(wen)度應(ying)力而引起(qi)管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)變(bian)形或破壞(huai)，需要在管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)上設置補(bu)償器(qi)(qi)，以補(bu)償管(guan)(guan)(guan)(guan)(guan)(guan)道(dao)的熱(re)(re)伸(shen)長，從而減(jian)小管(guan)(guan)(guan)(guan)(guan)(guan)壁的應(ying)力和(he)(he)作用(yong)在閥件(jian)或支(zhi)(zhi)架結構上的作用(yong)力。