補償器(qi)(qi)習慣上(shang)(shang)也(ye)(ye)叫膨(peng)脹節(jie)，或伸縮節(jie)。由構成其(qi)工作(zuo)主(zhu)(zhu)體的(de)波(bo)紋管(guan)(guan)(guan)(guan)(guan)(一(yi)種彈性元(yuan)件(jian))和(he)端管(guan)(guan)(guan)(guan)(guan)、支(zhi)架、法蘭(lan)、導管(guan)(guan)(guan)(guan)(guan)等附件(jian)組成。 屬于一(yi)種補償元(yuan)件(jian)。利用(yong)(yong)(yong)其(qi)工作(zuo)主(zhu)(zhu)體波(bo)紋管(guan)(guan)(guan)(guan)(guan)的(de)有效伸縮變形，以吸(xi)收管(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)、容(rong)器(qi)(qi)等由熱(re)(re)脹冷縮等原因而(er)產生的(de)尺寸變化，或補償管(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)、容(rong)器(qi)(qi)等的(de)軸(zhou)向、橫向和(he)角向位(wei)移(yi)。也(ye)(ye)可用(yong)(yong)(yong)于降噪減振。在現代(dai)工業中用(yong)(yong)(yong)途廣泛。供熱(re)(re)上(shang)(shang)，為(wei)了防止(zhi)供熱(re)(re)管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)升溫時，由于熱(re)(re)伸長或溫度應(ying)力(li)而(er)引起(qi)管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)變形或破(po)壞，需要(yao)在管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)上(shang)(shang)設置(zhi)補償器(qi)(qi)，以補償管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)的(de)熱(re)(re)伸長，從(cong)而(er)減小管(guan)(guan)(guan)(guan)(guan)壁的(de)應(ying)力(li)和(he)作(zuo)用(yong)(yong)(yong)在閥件(jian)或支(zhi)架結構上(shang)(shang)的(de)作(zuo)用(yong)(yong)(yong)力(li)。