補(bu)償器(qi)(qi)習(xi)慣上(shang)(shang)也(ye)(ye)叫(jiao)膨脹(zhang)節(jie)，或(huo)伸縮(suo)節(jie)。由構(gou)成其(qi)工(gong)作(zuo)主體(ti)(ti)的波紋管(guan)(guan)（一種彈性元件(jian)(jian)）和端管(guan)(guan)、支(zhi)架、法蘭、導(dao)管(guan)(guan)等附件(jian)(jian)組成。 屬于一種補(bu)償元件(jian)(jian)。利用(yong)(yong)(yong)(yong)其(qi)工(gong)作(zuo)主體(ti)(ti)波紋管(guan)(guan)的有效伸縮(suo)變形，以吸(xi)收(shou)管(guan)(guan)線(xian)、導(dao)管(guan)(guan)、容器(qi)(qi)等由熱脹(zhang)冷縮(suo)等原因(yin)而(er)產(chan)生的尺(chi)寸變化，或(huo)補(bu)償管(guan)(guan)線(xian)、導(dao)管(guan)(guan)、容器(qi)(qi)等的軸向、橫向和角向位移。也(ye)(ye)可用(yong)(yong)(yong)(yong)于降噪減(jian)振。在(zai)現(xian)代工(gong)業中用(yong)(yong)(yong)(yong)途廣泛。供熱上(shang)(shang)，為了防止(zhi)供熱管(guan)(guan)道(dao)升溫(wen)(wen)時，由于熱伸長或(huo)溫(wen)(wen)度(du)應力而(er)引起管(guan)(guan)道(dao)變形或(huo)破壞(huai)，需(xu)要在(zai)管(guan)(guan)道(dao)上(shang)(shang)設置補(bu)償器(qi)(qi)，以補(bu)償管(guan)(guan)道(dao)的熱伸長，從而(er)減(jian)小管(guan)(guan)壁的應力和作(zuo)用(yong)(yong)(yong)(yong)在(zai)閥(fa)件(jian)(jian)或(huo)支(zhi)架結(jie)構(gou)上(shang)(shang)的作(zuo)用(yong)(yong)(yong)(yong)力。