補償器習慣上(shang)也叫膨脹節(jie)，或伸縮節(jie)。由(you)構成(cheng)其(qi)工作(zuo)主體(ti)(ti)的(de)(de)波紋(wen)管(guan)(guan)(guan)(guan)(guan)（一種(zhong)彈性元(yuan)件(jian)）和端管(guan)(guan)(guan)(guan)(guan)、支(zhi)架(jia)、法蘭、導(dao)管(guan)(guan)(guan)(guan)(guan)等附(fu)件(jian)組成(cheng)。 屬于一種(zhong)補償元(yuan)件(jian)。利用其(qi)工作(zuo)主體(ti)(ti)波紋(wen)管(guan)(guan)(guan)(guan)(guan)的(de)(de)有效(xiao)伸縮變(bian)形，以吸(xi)收管(guan)(guan)(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)(guan)(guan)、容器等由(you)熱(re)脹冷(leng)縮等原(yuan)因(yin)而產生的(de)(de)尺寸(cun)變(bian)化，或補償管(guan)(guan)(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)(guan)(guan)、容器等的(de)(de)軸向(xiang)、橫向(xiang)和角(jiao)向(xiang)位(wei)移。也可(ke)用于降噪減(jian)振。在現(xian)代(dai)工業中用途廣泛。供熱(re)上(shang)，為了防止供熱(re)管(guan)(guan)(guan)(guan)(guan)道升溫(wen)時，由(you)于熱(re)伸長(chang)或溫(wen)度應力(li)而引起管(guan)(guan)(guan)(guan)(guan)道變(bian)形或破壞，需要在管(guan)(guan)(guan)(guan)(guan)道上(shang)設置補償器，以補償管(guan)(guan)(guan)(guan)(guan)道的(de)(de)熱(re)伸長(chang)，從(cong)而減(jian)小(xiao)管(guan)(guan)(guan)(guan)(guan)壁的(de)(de)應力(li)和作(zuo)用在閥件(jian)或支(zhi)架(jia)結(jie)構上(shang)的(de)(de)作(zuo)用力(li)。