補(bu)(bu)償(chang)器習慣上也(ye)(ye)叫膨脹(zhang)節，或(huo)(huo)伸縮節。由構成其(qi)工(gong)作主體的波紋管(guan)(guan)(guan)（一種彈(dan)性元件）和(he)端管(guan)(guan)(guan)、支(zhi)架、法蘭、導管(guan)(guan)(guan)等(deng)附件組成。 屬(shu)于(yu)一種補(bu)(bu)償(chang)元件。利用(yong)(yong)(yong)其(qi)工(gong)作主體波紋管(guan)(guan)(guan)的有效伸縮變形，以(yi)吸收管(guan)(guan)(guan)線、導管(guan)(guan)(guan)、容器等(deng)由熱(re)(re)脹(zhang)冷縮等(deng)原因而產生的尺(chi)寸(cun)變化，或(huo)(huo)補(bu)(bu)償(chang)管(guan)(guan)(guan)線、導管(guan)(guan)(guan)、容器等(deng)的軸向、橫向和(he)角(jiao)向位移。也(ye)(ye)可用(yong)(yong)(yong)于(yu)降噪減(jian)振。在(zai)現代工(gong)業(ye)中用(yong)(yong)(yong)途廣泛。供(gong)熱(re)(re)上，為了防止(zhi)供(gong)熱(re)(re)管(guan)(guan)(guan)道(dao)升溫時，由于(yu)熱(re)(re)伸長或(huo)(huo)溫度應(ying)力而引起管(guan)(guan)(guan)道(dao)變形或(huo)(huo)破壞(huai)，需要在(zai)管(guan)(guan)(guan)道(dao)上設(she)置補(bu)(bu)償(chang)器，以(yi)補(bu)(bu)償(chang)管(guan)(guan)(guan)道(dao)的熱(re)(re)伸長，從(cong)而減(jian)小管(guan)(guan)(guan)壁的應(ying)力和(he)作用(yong)(yong)(yong)在(zai)閥(fa)件或(huo)(huo)支(zhi)架結構上的作用(yong)(yong)(yong)力。