補(bu)償(chang)(chang)器習慣上(shang)也(ye)(ye)叫(jiao)膨脹(zhang)節，或伸(shen)縮(suo)節。由構成其(qi)工(gong)(gong)作(zuo)(zuo)主體(ti)的(de)(de)(de)波紋(wen)管(guan)(guan)（一種彈(dan)性元件）和(he)端管(guan)(guan)、支架(jia)、法(fa)蘭、導管(guan)(guan)等附件組(zu)成。 屬于一種補(bu)償(chang)(chang)元件。利用(yong)(yong)(yong)其(qi)工(gong)(gong)作(zuo)(zuo)主體(ti)波紋(wen)管(guan)(guan)的(de)(de)(de)有(you)效伸(shen)縮(suo)變(bian)(bian)形，以吸收(shou)管(guan)(guan)線、導管(guan)(guan)、容(rong)器等由熱(re)(re)脹(zhang)冷縮(suo)等原因而(er)產生的(de)(de)(de)尺(chi)寸變(bian)(bian)化(hua)，或補(bu)償(chang)(chang)管(guan)(guan)線、導管(guan)(guan)、容(rong)器等的(de)(de)(de)軸向(xiang)、橫(heng)向(xiang)和(he)角向(xiang)位移(yi)。也(ye)(ye)可用(yong)(yong)(yong)于降噪減(jian)振。在現代工(gong)(gong)業中用(yong)(yong)(yong)途(tu)廣泛。供熱(re)(re)上(shang)，為了防止供熱(re)(re)管(guan)(guan)道升溫(wen)(wen)時，由于熱(re)(re)伸(shen)長(chang)或溫(wen)(wen)度應力(li)而(er)引(yin)起管(guan)(guan)道變(bian)(bian)形或破(po)壞，需(xu)要(yao)在管(guan)(guan)道上(shang)設置補(bu)償(chang)(chang)器，以補(bu)償(chang)(chang)管(guan)(guan)道的(de)(de)(de)熱(re)(re)伸(shen)長(chang)，從而(er)減(jian)小管(guan)(guan)壁的(de)(de)(de)應力(li)和(he)作(zuo)(zuo)用(yong)(yong)(yong)在閥件或支架(jia)結構上(shang)的(de)(de)(de)作(zuo)(zuo)用(yong)(yong)(yong)力(li)。