補償器習慣上(shang)也叫(jiao)膨(peng)脹節(jie)，或(huo)(huo)伸縮節(jie)。由(you)構成(cheng)其(qi)工作主體的(de)(de)波紋管(guan)(guan)(guan)(guan)(guan)(guan)（一種(zhong)彈性元件(jian)）和(he)(he)端(duan)管(guan)(guan)(guan)(guan)(guan)(guan)、支架、法蘭、導(dao)(dao)管(guan)(guan)(guan)(guan)(guan)(guan)等附件(jian)組(zu)成(cheng)。 屬于(yu)一種(zhong)補償元件(jian)。利用(yong)其(qi)工作主體波紋管(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)有效伸縮變形(xing)，以吸收(shou)管(guan)(guan)(guan)(guan)(guan)(guan)線、導(dao)(dao)管(guan)(guan)(guan)(guan)(guan)(guan)、容器等由(you)熱(re)脹冷縮等原因而(er)(er)產生的(de)(de)尺寸(cun)變化，或(huo)(huo)補償管(guan)(guan)(guan)(guan)(guan)(guan)線、導(dao)(dao)管(guan)(guan)(guan)(guan)(guan)(guan)、容器等的(de)(de)軸向(xiang)、橫向(xiang)和(he)(he)角(jiao)向(xiang)位移。也可用(yong)于(yu)降噪減(jian)振。在(zai)(zai)現代(dai)工業中用(yong)途(tu)廣泛。供熱(re)上(shang)，為(wei)了防止供熱(re)管(guan)(guan)(guan)(guan)(guan)(guan)道升溫時，由(you)于(yu)熱(re)伸長或(huo)(huo)溫度應力(li)而(er)(er)引起管(guan)(guan)(guan)(guan)(guan)(guan)道變形(xing)或(huo)(huo)破壞，需要在(zai)(zai)管(guan)(guan)(guan)(guan)(guan)(guan)道上(shang)設置補償器，以補償管(guan)(guan)(guan)(guan)(guan)(guan)道的(de)(de)熱(re)伸長，從而(er)(er)減(jian)小管(guan)(guan)(guan)(guan)(guan)(guan)壁(bi)的(de)(de)應力(li)和(he)(he)作用(yong)在(zai)(zai)閥件(jian)或(huo)(huo)支架結構上(shang)的(de)(de)作用(yong)力(li)。