補償器(qi)(qi)習慣上也叫(jiao)膨脹節，或(huo)伸縮節。由構成其工(gong)作主(zhu)體的(de)波紋(wen)管(guan)(guan)(guan)(guan)（一種(zhong)彈性元件(jian)）和端管(guan)(guan)(guan)(guan)、支架、法蘭、導(dao)管(guan)(guan)(guan)(guan)等(deng)(deng)附件(jian)組成。 屬(shu)于(yu)一種(zhong)補償元件(jian)。利用(yong)(yong)(yong)其工(gong)作主(zhu)體波紋(wen)管(guan)(guan)(guan)(guan)的(de)有效伸縮變形(xing)，以(yi)吸(xi)收管(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)、容器(qi)(qi)等(deng)(deng)由熱(re)脹冷(leng)縮等(deng)(deng)原因而產生的(de)尺寸變化(hua)，或(huo)補償管(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)、容器(qi)(qi)等(deng)(deng)的(de)軸(zhou)向、橫向和角向位移。也可用(yong)(yong)(yong)于(yu)降噪減振。在(zai)現代工(gong)業中用(yong)(yong)(yong)途廣泛。供熱(re)上，為了防止供熱(re)管(guan)(guan)(guan)(guan)道升溫時(shi)，由于(yu)熱(re)伸長或(huo)溫度應(ying)力而引起管(guan)(guan)(guan)(guan)道變形(xing)或(huo)破壞，需(xu)要在(zai)管(guan)(guan)(guan)(guan)道上設置補償器(qi)(qi)，以(yi)補償管(guan)(guan)(guan)(guan)道的(de)熱(re)伸長，從而減小管(guan)(guan)(guan)(guan)壁的(de)應(ying)力和作用(yong)(yong)(yong)在(zai)閥(fa)件(jian)或(huo)支架結構上的(de)作用(yong)(yong)(yong)力。