補(bu)償(chang)器(qi)(qi)習慣上也(ye)(ye)叫膨(peng)脹節，或伸(shen)縮(suo)節。由構(gou)成其(qi)(qi)工(gong)(gong)作(zuo)主體的(de)(de)波(bo)紋管(guan)(guan)(guan)（一種(zhong)彈(dan)性元件）和(he)(he)端管(guan)(guan)(guan)、支架、法蘭、導(dao)管(guan)(guan)(guan)等(deng)(deng)附件組(zu)成。 屬于一種(zhong)補(bu)償(chang)元件。利用(yong)(yong)其(qi)(qi)工(gong)(gong)作(zuo)主體波(bo)紋管(guan)(guan)(guan)的(de)(de)有效伸(shen)縮(suo)變形(xing)，以吸收管(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)、容器(qi)(qi)等(deng)(deng)由熱脹冷縮(suo)等(deng)(deng)原因而(er)產(chan)生的(de)(de)尺寸變化，或補(bu)償(chang)管(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)、容器(qi)(qi)等(deng)(deng)的(de)(de)軸向(xiang)、橫向(xiang)和(he)(he)角(jiao)向(xiang)位移。也(ye)(ye)可用(yong)(yong)于降噪減(jian)振。在現代工(gong)(gong)業中用(yong)(yong)途(tu)廣泛。供(gong)熱上，為了(le)防止供(gong)熱管(guan)(guan)(guan)道(dao)(dao)升溫(wen)時，由于熱伸(shen)長或溫(wen)度應(ying)力而(er)引(yin)起管(guan)(guan)(guan)道(dao)(dao)變形(xing)或破壞(huai)，需(xu)要在管(guan)(guan)(guan)道(dao)(dao)上設置補(bu)償(chang)器(qi)(qi)，以補(bu)償(chang)管(guan)(guan)(guan)道(dao)(dao)的(de)(de)熱伸(shen)長，從(cong)而(er)減(jian)小(xiao)管(guan)(guan)(guan)壁的(de)(de)應(ying)力和(he)(he)作(zuo)用(yong)(yong)在閥(fa)件或支架結構(gou)上的(de)(de)作(zuo)用(yong)(yong)力。