補(bu)(bu)償(chang)(chang)器習慣上(shang)也叫膨脹節，或(huo)伸(shen)縮(suo)節。由構成(cheng)其工作(zuo)(zuo)主體(ti)的(de)(de)波紋(wen)管(guan)(guan)(guan)(guan)（一種(zhong)彈性元(yuan)(yuan)件(jian)）和(he)端(duan)管(guan)(guan)(guan)(guan)、支(zhi)架、法蘭、導(dao)管(guan)(guan)(guan)(guan)等(deng)(deng)附件(jian)組成(cheng)。 屬于(yu)一種(zhong)補(bu)(bu)償(chang)(chang)元(yuan)(yuan)件(jian)。利(li)用(yong)(yong)其工作(zuo)(zuo)主體(ti)波紋(wen)管(guan)(guan)(guan)(guan)的(de)(de)有效伸(shen)縮(suo)變形，以(yi)吸收(shou)管(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)、容(rong)器等(deng)(deng)由熱(re)脹冷縮(suo)等(deng)(deng)原因而(er)(er)(er)產生的(de)(de)尺(chi)寸變化(hua)，或(huo)補(bu)(bu)償(chang)(chang)管(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)、容(rong)器等(deng)(deng)的(de)(de)軸向(xiang)、橫向(xiang)和(he)角向(xiang)位移。也可用(yong)(yong)于(yu)降噪減振。在現代工業(ye)中用(yong)(yong)途廣泛。供熱(re)上(shang)，為了防止(zhi)供熱(re)管(guan)(guan)(guan)(guan)道升(sheng)溫時，由于(yu)熱(re)伸(shen)長或(huo)溫度(du)應(ying)力而(er)(er)(er)引起管(guan)(guan)(guan)(guan)道變形或(huo)破壞(huai)，需要(yao)在管(guan)(guan)(guan)(guan)道上(shang)設(she)置補(bu)(bu)償(chang)(chang)器，以(yi)補(bu)(bu)償(chang)(chang)管(guan)(guan)(guan)(guan)道的(de)(de)熱(re)伸(shen)長，從而(er)(er)(er)減小管(guan)(guan)(guan)(guan)壁的(de)(de)應(ying)力和(he)作(zuo)(zuo)用(yong)(yong)在閥件(jian)或(huo)支(zhi)架結構上(shang)的(de)(de)作(zuo)(zuo)用(yong)(yong)力。