補(bu)償器習慣(guan)上(shang)也(ye)叫(jiao)膨脹節，或(huo)伸(shen)(shen)縮節。由構成其工作(zuo)主體的波紋管(guan)(guan)(guan)(guan)(guan)(guan)（一種彈性元件(jian)）和端管(guan)(guan)(guan)(guan)(guan)(guan)、支(zhi)架、法蘭(lan)、導管(guan)(guan)(guan)(guan)(guan)(guan)等(deng)附件(jian)組成。 屬于(yu)(yu)一種補(bu)償元件(jian)。利用(yong)(yong)其工作(zuo)主體波紋管(guan)(guan)(guan)(guan)(guan)(guan)的有(you)效伸(shen)(shen)縮變形，以吸收(shou)管(guan)(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)(guan)、容器等(deng)由熱脹冷(leng)縮等(deng)原因而(er)(er)產生的尺寸(cun)變化，或(huo)補(bu)償管(guan)(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)(guan)、容器等(deng)的軸(zhou)向、橫向和角向位移。也(ye)可(ke)用(yong)(yong)于(yu)(yu)降噪減振。在(zai)現代(dai)工業(ye)中用(yong)(yong)途廣泛。供(gong)熱上(shang)，為了防止供(gong)熱管(guan)(guan)(guan)(guan)(guan)(guan)道升(sheng)溫時，由于(yu)(yu)熱伸(shen)(shen)長(chang)或(huo)溫度(du)應力而(er)(er)引(yin)起管(guan)(guan)(guan)(guan)(guan)(guan)道變形或(huo)破壞，需要在(zai)管(guan)(guan)(guan)(guan)(guan)(guan)道上(shang)設置(zhi)補(bu)償器，以補(bu)償管(guan)(guan)(guan)(guan)(guan)(guan)道的熱伸(shen)(shen)長(chang)，從(cong)而(er)(er)減小(xiao)管(guan)(guan)(guan)(guan)(guan)(guan)壁的應力和作(zuo)用(yong)(yong)在(zai)閥件(jian)或(huo)支(zhi)架結構上(shang)的作(zuo)用(yong)(yong)力。