補償器習慣上(shang)(shang)也叫膨脹節(jie)，或伸(shen)縮(suo)節(jie)。由構(gou)成(cheng)其工(gong)作(zuo)主(zhu)體(ti)的(de)(de)波(bo)紋(wen)管(guan)(guan)(guan)(guan)（一種(zhong)彈(dan)性元(yuan)件(jian)）和(he)端管(guan)(guan)(guan)(guan)、支(zhi)架、法(fa)蘭、導管(guan)(guan)(guan)(guan)等(deng)(deng)附(fu)件(jian)組成(cheng)。 屬于一種(zhong)補償元(yuan)件(jian)。利用(yong)(yong)(yong)其工(gong)作(zuo)主(zhu)體(ti)波(bo)紋(wen)管(guan)(guan)(guan)(guan)的(de)(de)有效伸(shen)縮(suo)變(bian)形，以吸(xi)收(shou)管(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)、容器等(deng)(deng)由熱(re)脹冷縮(suo)等(deng)(deng)原因而產生的(de)(de)尺寸變(bian)化(hua)，或補償管(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)、容器等(deng)(deng)的(de)(de)軸向、橫向和(he)角向位移。也可用(yong)(yong)(yong)于降噪(zao)減振。在(zai)現代工(gong)業中用(yong)(yong)(yong)途廣泛(fan)。供(gong)熱(re)上(shang)(shang)，為了防止供(gong)熱(re)管(guan)(guan)(guan)(guan)道升溫時，由于熱(re)伸(shen)長或溫度應力而引起管(guan)(guan)(guan)(guan)道變(bian)形或破(po)壞，需要在(zai)管(guan)(guan)(guan)(guan)道上(shang)(shang)設置補償器，以補償管(guan)(guan)(guan)(guan)道的(de)(de)熱(re)伸(shen)長，從而減小管(guan)(guan)(guan)(guan)壁(bi)的(de)(de)應力和(he)作(zuo)用(yong)(yong)(yong)在(zai)閥件(jian)或支(zhi)架結(jie)構(gou)上(shang)(shang)的(de)(de)作(zuo)用(yong)(yong)(yong)力。