補(bu)(bu)償(chang)器習(xi)慣上(shang)(shang)也(ye)(ye)叫(jiao)膨脹節，或伸(shen)縮節。由(you)(you)構成其(qi)工作主體(ti)(ti)的(de)(de)(de)波(bo)紋管(guan)(guan)(guan)(guan)(guan)(guan)（一種(zhong)彈性元件）和(he)端管(guan)(guan)(guan)(guan)(guan)(guan)、支架(jia)(jia)、法(fa)蘭、導(dao)管(guan)(guan)(guan)(guan)(guan)(guan)等附件組成。 屬于一種(zhong)補(bu)(bu)償(chang)元件。利用(yong)(yong)其(qi)工作主體(ti)(ti)波(bo)紋管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)(de)有效伸(shen)縮變(bian)形(xing)，以(yi)吸收管(guan)(guan)(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)(guan)(guan)、容(rong)器等由(you)(you)熱(re)(re)脹冷縮等原因而(er)產生(sheng)的(de)(de)(de)尺寸變(bian)化(hua)，或補(bu)(bu)償(chang)管(guan)(guan)(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)(guan)(guan)、容(rong)器等的(de)(de)(de)軸向、橫向和(he)角向位移。也(ye)(ye)可用(yong)(yong)于降噪減振。在現代工業(ye)中用(yong)(yong)途廣(guang)泛。供(gong)(gong)熱(re)(re)上(shang)(shang)，為了防止(zhi)供(gong)(gong)熱(re)(re)管(guan)(guan)(guan)(guan)(guan)(guan)道升溫時，由(you)(you)于熱(re)(re)伸(shen)長(chang)或溫度(du)應(ying)力(li)(li)而(er)引(yin)起管(guan)(guan)(guan)(guan)(guan)(guan)道變(bian)形(xing)或破壞，需要在管(guan)(guan)(guan)(guan)(guan)(guan)道上(shang)(shang)設置補(bu)(bu)償(chang)器，以(yi)補(bu)(bu)償(chang)管(guan)(guan)(guan)(guan)(guan)(guan)道的(de)(de)(de)熱(re)(re)伸(shen)長(chang)，從而(er)減小管(guan)(guan)(guan)(guan)(guan)(guan)壁(bi)的(de)(de)(de)應(ying)力(li)(li)和(he)作用(yong)(yong)在閥件或支架(jia)(jia)結構上(shang)(shang)的(de)(de)(de)作用(yong)(yong)力(li)(li)。