補(bu)償(chang)器習慣上(shang)也(ye)叫膨脹(zhang)節(jie)(jie)，或伸縮節(jie)(jie)。由(you)(you)構成其工作主(zhu)體的(de)波紋(wen)管(guan)(guan)(guan)（一(yi)(yi)種彈(dan)性(xing)元件(jian)）和(he)(he)端(duan)管(guan)(guan)(guan)、支(zhi)架、法蘭、導(dao)(dao)管(guan)(guan)(guan)等(deng)(deng)附件(jian)組成。 屬于(yu)(yu)一(yi)(yi)種補(bu)償(chang)元件(jian)。利用(yong)(yong)(yong)其工作主(zhu)體波紋(wen)管(guan)(guan)(guan)的(de)有效伸縮變(bian)形(xing)，以(yi)吸收管(guan)(guan)(guan)線、導(dao)(dao)管(guan)(guan)(guan)、容器等(deng)(deng)由(you)(you)熱(re)脹(zhang)冷縮等(deng)(deng)原因而產生的(de)尺寸變(bian)化，或補(bu)償(chang)管(guan)(guan)(guan)線、導(dao)(dao)管(guan)(guan)(guan)、容器等(deng)(deng)的(de)軸向、橫向和(he)(he)角向位移(yi)。也(ye)可用(yong)(yong)(yong)于(yu)(yu)降噪減振。在(zai)現(xian)代工業中用(yong)(yong)(yong)途廣泛(fan)。供(gong)熱(re)上(shang)，為了防(fang)止供(gong)熱(re)管(guan)(guan)(guan)道(dao)升溫時，由(you)(you)于(yu)(yu)熱(re)伸長(chang)或溫度(du)應力而引起管(guan)(guan)(guan)道(dao)變(bian)形(xing)或破壞，需要在(zai)管(guan)(guan)(guan)道(dao)上(shang)設置補(bu)償(chang)器，以(yi)補(bu)償(chang)管(guan)(guan)(guan)道(dao)的(de)熱(re)伸長(chang)，從(cong)而減小管(guan)(guan)(guan)壁的(de)應力和(he)(he)作用(yong)(yong)(yong)在(zai)閥件(jian)或支(zhi)架結(jie)構上(shang)的(de)作用(yong)(yong)(yong)力。