補償器(qi)(qi)習慣上(shang)也(ye)叫膨脹(zhang)節(jie)，或(huo)伸(shen)(shen)縮節(jie)。由(you)構成其工(gong)作(zuo)主體的(de)(de)(de)波(bo)紋(wen)管(guan)(guan)(guan)(guan)（一(yi)種彈性元件(jian)）和端管(guan)(guan)(guan)(guan)、支架、法蘭、導管(guan)(guan)(guan)(guan)等(deng)附件(jian)組成。 屬于一(yi)種補償元件(jian)。利用其工(gong)作(zuo)主體波(bo)紋(wen)管(guan)(guan)(guan)(guan)的(de)(de)(de)有效伸(shen)(shen)縮變形(xing)，以吸收管(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)、容(rong)器(qi)(qi)等(deng)由(you)熱(re)(re)脹(zhang)冷縮等(deng)原因而(er)(er)產生的(de)(de)(de)尺寸(cun)變化，或(huo)補償管(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)、容(rong)器(qi)(qi)等(deng)的(de)(de)(de)軸向、橫向和角向位移(yi)。也(ye)可用于降噪減(jian)振。在(zai)現(xian)代工(gong)業中用途廣泛(fan)。供熱(re)(re)上(shang)，為了防止供熱(re)(re)管(guan)(guan)(guan)(guan)道升溫(wen)時(shi)，由(you)于熱(re)(re)伸(shen)(shen)長或(huo)溫(wen)度應(ying)力而(er)(er)引起管(guan)(guan)(guan)(guan)道變形(xing)或(huo)破壞(huai)，需要在(zai)管(guan)(guan)(guan)(guan)道上(shang)設置補償器(qi)(qi)，以補償管(guan)(guan)(guan)(guan)道的(de)(de)(de)熱(re)(re)伸(shen)(shen)長，從(cong)而(er)(er)減(jian)小管(guan)(guan)(guan)(guan)壁的(de)(de)(de)應(ying)力和作(zuo)用在(zai)閥件(jian)或(huo)支架結構上(shang)的(de)(de)(de)作(zuo)用力。