補償(chang)器習慣上(shang)也(ye)叫膨脹節(jie)，或伸(shen)縮(suo)(suo)節(jie)。由構成(cheng)(cheng)其工(gong)作(zuo)主(zhu)體的(de)波紋管(guan)(guan)(guan)(guan)（一種彈性(xing)元(yuan)件(jian)）和(he)端管(guan)(guan)(guan)(guan)、支架、法蘭(lan)、導(dao)(dao)管(guan)(guan)(guan)(guan)等附件(jian)組成(cheng)(cheng)。 屬(shu)于(yu)(yu)一種補償(chang)元(yuan)件(jian)。利用(yong)(yong)其工(gong)作(zuo)主(zhu)體波紋管(guan)(guan)(guan)(guan)的(de)有效(xiao)伸(shen)縮(suo)(suo)變(bian)(bian)形，以吸收(shou)管(guan)(guan)(guan)(guan)線(xian)、導(dao)(dao)管(guan)(guan)(guan)(guan)、容(rong)器等由熱(re)脹冷縮(suo)(suo)等原因而產(chan)生的(de)尺寸變(bian)(bian)化(hua)，或補償(chang)管(guan)(guan)(guan)(guan)線(xian)、導(dao)(dao)管(guan)(guan)(guan)(guan)、容(rong)器等的(de)軸向、橫向和(he)角向位移。也(ye)可(ke)用(yong)(yong)于(yu)(yu)降噪減(jian)振。在現(xian)代(dai)工(gong)業中用(yong)(yong)途廣(guang)泛。供(gong)(gong)熱(re)上(shang)，為了防止供(gong)(gong)熱(re)管(guan)(guan)(guan)(guan)道(dao)升溫(wen)時，由于(yu)(yu)熱(re)伸(shen)長(chang)或溫(wen)度應力而引起管(guan)(guan)(guan)(guan)道(dao)變(bian)(bian)形或破壞，需要在管(guan)(guan)(guan)(guan)道(dao)上(shang)設置補償(chang)器，以補償(chang)管(guan)(guan)(guan)(guan)道(dao)的(de)熱(re)伸(shen)長(chang)，從而減(jian)小管(guan)(guan)(guan)(guan)壁的(de)應力和(he)作(zuo)用(yong)(yong)在閥件(jian)或支架結(jie)構上(shang)的(de)作(zuo)用(yong)(yong)力。