補(bu)(bu)償器(qi)(qi)習慣上也(ye)叫膨(peng)脹(zhang)(zhang)節(jie)，或伸縮(suo)節(jie)。由構(gou)成其(qi)(qi)工作(zuo)(zuo)主體(ti)的(de)(de)(de)波紋管(guan)(guan)(guan)(guan)(guan)（一種(zhong)彈性(xing)元(yuan)件(jian)(jian)）和端(duan)管(guan)(guan)(guan)(guan)(guan)、支架(jia)、法蘭、導管(guan)(guan)(guan)(guan)(guan)等(deng)(deng)附件(jian)(jian)組成。 屬于一種(zhong)補(bu)(bu)償元(yuan)件(jian)(jian)。利用(yong)其(qi)(qi)工作(zuo)(zuo)主體(ti)波紋管(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)有效伸縮(suo)變(bian)形(xing)(xing)，以吸收管(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)、容器(qi)(qi)等(deng)(deng)由熱(re)脹(zhang)(zhang)冷縮(suo)等(deng)(deng)原因而(er)產生(sheng)的(de)(de)(de)尺寸變(bian)化，或補(bu)(bu)償管(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)、容器(qi)(qi)等(deng)(deng)的(de)(de)(de)軸(zhou)向(xiang)(xiang)、橫向(xiang)(xiang)和角(jiao)向(xiang)(xiang)位移。也(ye)可用(yong)于降噪減振。在現代工業中用(yong)途廣泛。供(gong)熱(re)上，為了(le)防止供(gong)熱(re)管(guan)(guan)(guan)(guan)(guan)道(dao)升溫(wen)(wen)時(shi)，由于熱(re)伸長(chang)或溫(wen)(wen)度(du)應力而(er)引起管(guan)(guan)(guan)(guan)(guan)道(dao)變(bian)形(xing)(xing)或破壞，需要在管(guan)(guan)(guan)(guan)(guan)道(dao)上設(she)置補(bu)(bu)償器(qi)(qi)，以補(bu)(bu)償管(guan)(guan)(guan)(guan)(guan)道(dao)的(de)(de)(de)熱(re)伸長(chang)，從而(er)減小管(guan)(guan)(guan)(guan)(guan)壁的(de)(de)(de)應力和作(zuo)(zuo)用(yong)在閥件(jian)(jian)或支架(jia)結(jie)構(gou)上的(de)(de)(de)作(zuo)(zuo)用(yong)力。