補(bu)(bu)償器(qi)習慣上(shang)也(ye)叫膨脹(zhang)節(jie)，或伸縮節(jie)。由構成其工(gong)(gong)作(zuo)主(zhu)體(ti)的(de)波紋管(guan)(guan)（一種彈(dan)性(xing)元(yuan)件(jian)）和端管(guan)(guan)、支架、法蘭、導(dao)(dao)管(guan)(guan)等附件(jian)組成。 屬于(yu)一種補(bu)(bu)償元(yuan)件(jian)。利用(yong)(yong)其工(gong)(gong)作(zuo)主(zhu)體(ti)波紋管(guan)(guan)的(de)有(you)效伸縮變形，以吸收管(guan)(guan)線(xian)、導(dao)(dao)管(guan)(guan)、容(rong)器(qi)等由熱(re)脹(zhang)冷縮等原(yuan)因而(er)產生的(de)尺(chi)寸(cun)變化，或補(bu)(bu)償管(guan)(guan)線(xian)、導(dao)(dao)管(guan)(guan)、容(rong)器(qi)等的(de)軸向、橫向和角(jiao)向位(wei)移。也(ye)可用(yong)(yong)于(yu)降噪減(jian)振。在(zai)現代工(gong)(gong)業(ye)中用(yong)(yong)途廣泛(fan)。供熱(re)上(shang)，為了防止供熱(re)管(guan)(guan)道(dao)升溫時，由于(yu)熱(re)伸長或溫度應力(li)而(er)引(yin)起管(guan)(guan)道(dao)變形或破(po)壞，需(xu)要(yao)在(zai)管(guan)(guan)道(dao)上(shang)設(she)置(zhi)補(bu)(bu)償器(qi)，以補(bu)(bu)償管(guan)(guan)道(dao)的(de)熱(re)伸長，從而(er)減(jian)小(xiao)管(guan)(guan)壁的(de)應力(li)和作(zuo)用(yong)(yong)在(zai)閥件(jian)或支架結(jie)構上(shang)的(de)作(zuo)用(yong)(yong)力(li)。