補償器習慣上也叫膨脹節，或伸縮節。由構成其工作主體的波紋管（一種彈性元件）和端管、支架、法蘭、導管等附件組成。膨脹節廠家 屬于一種(zhong)補償元件(jian)。利用(yong)其工(gong)作(zuo)主體波紋(wen)管(guan)(guan)(guan)(guan)(guan)的(de)有效(xiao)伸(shen)(shen)縮(suo)變形(xing)，以吸收(shou)管(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)、容器等(deng)由(you)(you)熱脹冷縮(suo)等(deng)原因(yin)而(er)產生的(de)尺寸變化，或(huo)補償管(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)、容器等(deng)的(de)軸向(xiang)、橫(heng)向(xiang)和角向(xiang)位移。也可用(yong)于降噪減振。在現代工(gong)業中(zhong)用(yong)途廣泛。供熱上(shang)，為了防(fang)止供熱管(guan)(guan)(guan)(guan)(guan)道(dao)升(sheng)溫時(shi)，由(you)(you)于熱伸(shen)(shen)長或(huo)溫度應(ying)力(li)而(er)引起管(guan)(guan)(guan)(guan)(guan)道(dao)變形(xing)或(huo)破壞，需(xu)要(yao)在管(guan)(guan)(guan)(guan)(guan)道(dao)上(shang)設置補償器，以補償管(guan)(guan)(guan)(guan)(guan)道(dao)的(de)熱伸(shen)(shen)長，從而(er)減小管(guan)(guan)(guan)(guan)(guan)壁(bi)的(de)應(ying)力(li)和作(zuo)用(yong)在閥件(jian)或(huo)支架結構上(shang)的(de)作(zuo)用(yong)力(li)。