補(bu)償器習慣上(shang)也(ye)叫膨脹(zhang)節(jie)，或伸縮節(jie)。由構(gou)(gou)成(cheng)其工(gong)作主體(ti)的波紋(wen)管(guan)(guan)(guan)(guan)（一種(zhong)彈性元件）和(he)端管(guan)(guan)(guan)(guan)、支架、法蘭(lan)、導(dao)管(guan)(guan)(guan)(guan)等附件組(zu)成(cheng)。 屬于(yu)一種(zhong)補(bu)償元件。利用(yong)其工(gong)作主體(ti)波紋(wen)管(guan)(guan)(guan)(guan)的有效伸縮變(bian)形，以吸(xi)收管(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)、容器等由熱脹(zhang)冷縮等原因(yin)而(er)(er)產生的尺寸變(bian)化，或補(bu)償管(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)、容器等的軸向(xiang)、橫向(xiang)和(he)角向(xiang)位移。也(ye)可用(yong)于(yu)降(jiang)噪減(jian)振。在(zai)現代工(gong)業中用(yong)途廣泛(fan)。供熱上(shang)，為了防(fang)止供熱管(guan)(guan)(guan)(guan)道升溫時，由于(yu)熱伸長或溫度應力而(er)(er)引起管(guan)(guan)(guan)(guan)道變(bian)形或破壞，需要在(zai)管(guan)(guan)(guan)(guan)道上(shang)設置補(bu)償器，以補(bu)償管(guan)(guan)(guan)(guan)道的熱伸長，從而(er)(er)減(jian)小(xiao)管(guan)(guan)(guan)(guan)壁的應力和(he)作用(yong)在(zai)閥(fa)件或支架結構(gou)(gou)上(shang)的作用(yong)力。