補償器習慣(guan)上也叫膨脹節(jie)，或伸(shen)(shen)(shen)縮(suo)節(jie)。由構(gou)成(cheng)其(qi)工作(zuo)主(zhu)體(ti)的(de)波紋管(guan)(guan)(guan)(guan)(guan)（一種彈性元(yuan)件(jian)）和(he)(he)端管(guan)(guan)(guan)(guan)(guan)、支(zhi)架(jia)、法蘭(lan)、導管(guan)(guan)(guan)(guan)(guan)等(deng)附件(jian)組成(cheng)。 屬于一種補償元(yuan)件(jian)。利(li)用(yong)(yong)其(qi)工作(zuo)主(zhu)體(ti)波紋管(guan)(guan)(guan)(guan)(guan)的(de)有效伸(shen)(shen)(shen)縮(suo)變(bian)(bian)形(xing)，以(yi)吸收(shou)管(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)、容器等(deng)由熱(re)(re)脹冷縮(suo)等(deng)原因(yin)而(er)產(chan)生的(de)尺寸變(bian)(bian)化(hua)，或補償管(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)、容器等(deng)的(de)軸向(xiang)(xiang)、橫向(xiang)(xiang)和(he)(he)角向(xiang)(xiang)位(wei)移。也可用(yong)(yong)于降噪減振。在現代工業中用(yong)(yong)途廣泛。供熱(re)(re)上，為了防止供熱(re)(re)管(guan)(guan)(guan)(guan)(guan)道(dao)升溫(wen)時，由于熱(re)(re)伸(shen)(shen)(shen)長或溫(wen)度應力(li)(li)而(er)引(yin)起(qi)管(guan)(guan)(guan)(guan)(guan)道(dao)變(bian)(bian)形(xing)或破(po)壞，需(xu)要在管(guan)(guan)(guan)(guan)(guan)道(dao)上設置補償器，以(yi)補償管(guan)(guan)(guan)(guan)(guan)道(dao)的(de)熱(re)(re)伸(shen)(shen)(shen)長，從而(er)減小管(guan)(guan)(guan)(guan)(guan)壁的(de)應力(li)(li)和(he)(he)作(zuo)用(yong)(yong)在閥件(jian)或支(zhi)架(jia)結構(gou)上的(de)作(zuo)用(yong)(yong)力(li)(li)。