補償器習慣上也叫膨脹節，或伸縮節。由構成其工作主體的波紋管（一種彈性元件）和端管、支架、法蘭、導管等附件組成。膨脹節廠家 屬(shu)于一種補償元件。利用(yong)其工(gong)作(zuo)主體波紋(wen)管(guan)(guan)(guan)的有效伸(shen)縮變形(xing)，以(yi)吸收(shou)管(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)、容(rong)器(qi)等由(you)熱(re)(re)(re)脹冷縮等原因而產生的尺寸(cun)變化，或(huo)補償管(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)、容(rong)器(qi)等的軸向、橫向和角向位移(yi)。也可用(yong)于降噪減振。在(zai)現(xian)代工(gong)業中用(yong)途廣泛。供(gong)(gong)熱(re)(re)(re)上(shang)，為了(le)防止供(gong)(gong)熱(re)(re)(re)管(guan)(guan)(guan)道(dao)升溫時(shi)，由(you)于熱(re)(re)(re)伸(shen)長或(huo)溫度應力而引(yin)起(qi)管(guan)(guan)(guan)道(dao)變形(xing)或(huo)破壞，需要在(zai)管(guan)(guan)(guan)道(dao)上(shang)設置(zhi)補償器(qi)，以(yi)補償管(guan)(guan)(guan)道(dao)的熱(re)(re)(re)伸(shen)長，從而減小管(guan)(guan)(guan)壁的應力和作(zuo)用(yong)在(zai)閥件或(huo)支架結構上(shang)的作(zuo)用(yong)力。