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(yu)(yu)一(yi)種補償元件。利(li)用(yong)(yong)其(qi)工作(zuo)主體波紋管(guan)(guan)(guan)(guan)(guan)的(de)有效(xiao)伸縮變(bian)(bian)形(xing)，以吸(xi)收(shou)管(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)、容器(qi)等(deng)由熱(re)(re)(re)脹(zhang)冷縮等(deng)原因(yin)而(er)產生的(de)尺(chi)寸變(bian)(bian)化(hua)，或(huo)補償管(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)、容器(qi)等(deng)的(de)軸向(xiang)、橫向(xiang)和(he)角向(xiang)位移。也可用(yong)(yong)于(yu)(yu)降噪減振。在現代工業(ye)中用(yong)(yong)途廣(guang)泛(fan)。供(gong)(gong)熱(re)(re)(re)上(shang)(shang)，為了防止供(gong)(gong)熱(re)(re)(re)管(guan)(guan)(guan)(guan)(guan)道(dao)升溫(wen)時，由于(yu)(yu)熱(re)(re)(re)伸長或(huo)溫(wen)度(du)應力(li)而(er)引起管(guan)(guan)(guan)(guan)(guan)道(dao)變(bian)(bian)形(xing)或(huo)破壞，需(xu)要在管(guan)(guan)(guan)(guan)(guan)道(dao)上(shang)(shang)設置補償器(qi)，以補償管(guan)(guan)(guan)(guan)(guan)道(dao)的(de)熱(re)(re)(re)伸長，從而(er)減小管(guan)(guan)(guan)(guan)(guan)壁的(de)應力(li)和(he)作(zuo)用(yong)(yong)在閥件或(huo)支架結構上(shang)(shang)的(de)作(zuo)用(yong)(yong)力(li)。