補償器(qi)習(xi)慣(guan)上也叫膨脹(zhang)節，或(huo)伸(shen)(shen)(shen)縮節。由構成其(qi)工(gong)作(zuo)主體的(de)(de)波紋(wen)管(guan)(guan)(guan)（一種彈性元件(jian)）和(he)端管(guan)(guan)(guan)、支架、法蘭、導(dao)管(guan)(guan)(guan)等(deng)(deng)附件(jian)組成。 屬(shu)于(yu)一種補償元件(jian)。利用(yong)其(qi)工(gong)作(zuo)主體波紋(wen)管(guan)(guan)(guan)的(de)(de)有效伸(shen)(shen)(shen)縮變形，以(yi)吸收(shou)管(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)、容(rong)(rong)器(qi)等(deng)(deng)由熱(re)脹(zhang)冷(leng)縮等(deng)(deng)原因而(er)產生的(de)(de)尺寸變化，或(huo)補償管(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)、容(rong)(rong)器(qi)等(deng)(deng)的(de)(de)軸向、橫向和(he)角向位(wei)移。也可用(yong)于(yu)降噪減振。在(zai)現代工(gong)業中(zhong)用(yong)途廣泛。供熱(re)上，為(wei)了防止供熱(re)管(guan)(guan)(guan)道升溫(wen)時(shi)，由于(yu)熱(re)伸(shen)(shen)(shen)長或(huo)溫(wen)度應(ying)力而(er)引(yin)起管(guan)(guan)(guan)道變形或(huo)破壞(huai)，需要(yao)在(zai)管(guan)(guan)(guan)道上設置補償器(qi)，以(yi)補償管(guan)(guan)(guan)道的(de)(de)熱(re)伸(shen)(shen)(shen)長，從而(er)減小管(guan)(guan)(guan)壁的(de)(de)應(ying)力和(he)作(zuo)用(yong)在(zai)閥件(jian)或(huo)支架結構上的(de)(de)作(zuo)用(yong)力。