補償器習(xi)慣(guan)上(shang)也叫(jiao)膨脹節(jie)，或(huo)伸縮(suo)節(jie)。由構成其工(gong)(gong)作(zuo)(zuo)主體的波(bo)(bo)紋(wen)管(guan)(guan)(guan)（一(yi)(yi)種(zhong)彈性元(yuan)(yuan)件(jian)(jian)）和(he)(he)端(duan)管(guan)(guan)(guan)、支架、法蘭(lan)、導管(guan)(guan)(guan)等附件(jian)(jian)組成。 屬(shu)于一(yi)(yi)種(zhong)補償元(yuan)(yuan)件(jian)(jian)。利用(yong)其工(gong)(gong)作(zuo)(zuo)主體波(bo)(bo)紋(wen)管(guan)(guan)(guan)的有效伸縮(suo)變(bian)形，以吸收管(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)、容器等由熱(re)脹冷(leng)縮(suo)等原因(yin)而(er)產生的尺(chi)寸變(bian)化，或(huo)補償管(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)、容器等的軸向(xiang)、橫向(xiang)和(he)(he)角向(xiang)位移。也可(ke)用(yong)于降噪(zao)減(jian)振。在(zai)現代工(gong)(gong)業中用(yong)途廣泛。供熱(re)上(shang)，為了防止供熱(re)管(guan)(guan)(guan)道(dao)(dao)升溫時，由于熱(re)伸長(chang)或(huo)溫度應(ying)力而(er)引起(qi)管(guan)(guan)(guan)道(dao)(dao)變(bian)形或(huo)破壞，需要在(zai)管(guan)(guan)(guan)道(dao)(dao)上(shang)設置補償器，以補償管(guan)(guan)(guan)道(dao)(dao)的熱(re)伸長(chang)，從(cong)而(er)減(jian)小管(guan)(guan)(guan)壁的應(ying)力和(he)(he)作(zuo)(zuo)用(yong)在(zai)閥件(jian)(jian)或(huo)支架結構上(shang)的作(zuo)(zuo)用(yong)力。