補償器習慣(guan)上(shang)(shang)也(ye)叫膨脹(zhang)節(jie)，或伸縮(suo)節(jie)。由構成其(qi)工(gong)作(zuo)主體的(de)波紋管(guan)(guan)(guan)(guan)（一種彈性元(yuan)件）和端管(guan)(guan)(guan)(guan)、支(zhi)架、法蘭、導(dao)管(guan)(guan)(guan)(guan)等附(fu)件組成。 屬于(yu)一種補償元(yuan)件。利用(yong)其(qi)工(gong)作(zuo)主體波紋管(guan)(guan)(guan)(guan)的(de)有(you)效(xiao)伸縮(suo)變形，以吸收管(guan)(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)(guan)、容(rong)器等由熱(re)(re)(re)脹(zhang)冷縮(suo)等原因(yin)而(er)產生的(de)尺(chi)寸變化，或補償管(guan)(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)(guan)、容(rong)器等的(de)軸向、橫向和角向位移。也(ye)可用(yong)于(yu)降(jiang)噪減振。在(zai)現代工(gong)業中(zhong)用(yong)途廣泛。供(gong)熱(re)(re)(re)上(shang)(shang)，為了防止供(gong)熱(re)(re)(re)管(guan)(guan)(guan)(guan)道升溫(wen)時，由于(yu)熱(re)(re)(re)伸長或溫(wen)度應力(li)而(er)引起管(guan)(guan)(guan)(guan)道變形或破壞，需要(yao)在(zai)管(guan)(guan)(guan)(guan)道上(shang)(shang)設置補償器，以補償管(guan)(guan)(guan)(guan)道的(de)熱(re)(re)(re)伸長，從(cong)而(er)減小管(guan)(guan)(guan)(guan)壁(bi)的(de)應力(li)和作(zuo)用(yong)在(zai)閥件或支(zhi)架結(jie)構上(shang)(shang)的(de)作(zuo)用(yong)力(li)。