補(bu)償器習(xi)慣上(shang)也叫膨脹節(jie)(jie)，或伸(shen)縮(suo)節(jie)(jie)。由構成其(qi)工作主體的(de)(de)波(bo)紋管(guan)(guan)(guan)(guan)（一(yi)種彈性(xing)元件(jian)）和端管(guan)(guan)(guan)(guan)、支(zhi)(zhi)架(jia)、法蘭(lan)、導管(guan)(guan)(guan)(guan)等(deng)(deng)附件(jian)組成。 屬于一(yi)種補(bu)償元件(jian)。利用(yong)其(qi)工作主體波(bo)紋管(guan)(guan)(guan)(guan)的(de)(de)有效伸(shen)縮(suo)變(bian)形，以吸(xi)收(shou)管(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)、容(rong)器等(deng)(deng)由熱(re)脹冷縮(suo)等(deng)(deng)原因而產生的(de)(de)尺寸變(bian)化，或補(bu)償管(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)、容(rong)器等(deng)(deng)的(de)(de)軸向、橫向和角向位移。也可用(yong)于降噪減振。在(zai)現代工業(ye)中用(yong)途(tu)廣泛(fan)。供(gong)熱(re)上(shang)，為(wei)了防(fang)止(zhi)供(gong)熱(re)管(guan)(guan)(guan)(guan)道(dao)升(sheng)溫時(shi)，由于熱(re)伸(shen)長或溫度應力而引(yin)起管(guan)(guan)(guan)(guan)道(dao)變(bian)形或破壞，需(xu)要(yao)在(zai)管(guan)(guan)(guan)(guan)道(dao)上(shang)設置補(bu)償器，以補(bu)償管(guan)(guan)(guan)(guan)道(dao)的(de)(de)熱(re)伸(shen)長，從(cong)而減小管(guan)(guan)(guan)(guan)壁的(de)(de)應力和作用(yong)在(zai)閥件(jian)或支(zhi)(zhi)架(jia)結構上(shang)的(de)(de)作用(yong)力。