補(bu)償器習慣上(shang)也叫膨脹節，或(huo)伸(shen)縮(suo)節。由(you)構(gou)成其(qi)工(gong)(gong)作(zuo)主體的(de)(de)(de)波(bo)紋管(guan)(guan)(guan)(guan)（一種彈(dan)性元(yuan)件(jian)(jian)）和(he)(he)端管(guan)(guan)(guan)(guan)、支(zhi)架(jia)、法蘭、導管(guan)(guan)(guan)(guan)等附件(jian)(jian)組成。 屬于一種補(bu)償元(yuan)件(jian)(jian)。利用(yong)其(qi)工(gong)(gong)作(zuo)主體波(bo)紋管(guan)(guan)(guan)(guan)的(de)(de)(de)有效伸(shen)縮(suo)變形，以吸收管(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)、容(rong)器等由(you)熱(re)(re)脹冷(leng)縮(suo)等原因(yin)而產生的(de)(de)(de)尺寸變化，或(huo)補(bu)償管(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)、容(rong)器等的(de)(de)(de)軸向(xiang)(xiang)、橫向(xiang)(xiang)和(he)(he)角向(xiang)(xiang)位移。也可(ke)用(yong)于降噪減(jian)振。在現代工(gong)(gong)業(ye)中用(yong)途(tu)廣泛。供熱(re)(re)上(shang)，為了防止(zhi)供熱(re)(re)管(guan)(guan)(guan)(guan)道升溫(wen)時(shi)，由(you)于熱(re)(re)伸(shen)長或(huo)溫(wen)度應力而引(yin)起(qi)管(guan)(guan)(guan)(guan)道變形或(huo)破壞，需要(yao)在管(guan)(guan)(guan)(guan)道上(shang)設置補(bu)償器，以補(bu)償管(guan)(guan)(guan)(guan)道的(de)(de)(de)熱(re)(re)伸(shen)長，從(cong)而減(jian)小(xiao)管(guan)(guan)(guan)(guan)壁的(de)(de)(de)應力和(he)(he)作(zuo)用(yong)在閥件(jian)(jian)或(huo)支(zhi)架(jia)結構(gou)上(shang)的(de)(de)(de)作(zuo)用(yong)力。