補償器習(xi)慣(guan)上(shang)(shang)也叫膨脹節(jie)，或伸縮節(jie)。由(you)構成(cheng)其工作(zuo)(zuo)主(zhu)(zhu)體的(de)(de)波紋管(guan)(guan)(guan)(guan)（一種(zhong)彈性元件）和端管(guan)(guan)(guan)(guan)、支架、法(fa)蘭、導(dao)管(guan)(guan)(guan)(guan)等(deng)(deng)附件組成(cheng)。 屬于一種(zhong)補償元件。利用(yong)其工作(zuo)(zuo)主(zhu)(zhu)體波紋管(guan)(guan)(guan)(guan)的(de)(de)有效伸縮變(bian)(bian)形，以吸(xi)收(shou)管(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)、容(rong)器等(deng)(deng)由(you)熱(re)脹冷縮等(deng)(deng)原因而(er)(er)產生的(de)(de)尺寸變(bian)(bian)化，或補償管(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)、容(rong)器等(deng)(deng)的(de)(de)軸(zhou)向(xiang)、橫(heng)向(xiang)和角向(xiang)位移。也可用(yong)于降(jiang)噪(zao)減振。在現代工業中用(yong)途廣泛(fan)。供(gong)熱(re)上(shang)(shang)，為了(le)防止(zhi)供(gong)熱(re)管(guan)(guan)(guan)(guan)道(dao)升溫(wen)時，由(you)于熱(re)伸長或溫(wen)度應(ying)力(li)而(er)(er)引起管(guan)(guan)(guan)(guan)道(dao)變(bian)(bian)形或破壞，需要在管(guan)(guan)(guan)(guan)道(dao)上(shang)(shang)設置補償器，以補償管(guan)(guan)(guan)(guan)道(dao)的(de)(de)熱(re)伸長，從(cong)而(er)(er)減小管(guan)(guan)(guan)(guan)壁的(de)(de)應(ying)力(li)和作(zuo)(zuo)用(yong)在閥件或支架結構上(shang)(shang)的(de)(de)作(zuo)(zuo)用(yong)力(li)。