補(bu)償(chang)器(qi)習(xi)慣上(shang)也叫膨脹(zhang)節(jie)(jie)，或(huo)(huo)伸縮節(jie)(jie)。由(you)構(gou)成(cheng)其(qi)工(gong)作(zuo)主體的(de)波紋管(guan)(guan)(guan)（一種彈(dan)性元件）和(he)端管(guan)(guan)(guan)、支架、法蘭、導(dao)管(guan)(guan)(guan)等(deng)附件組成(cheng)。 屬于一種補(bu)償(chang)元件。利用(yong)(yong)其(qi)工(gong)作(zuo)主體波紋管(guan)(guan)(guan)的(de)有效伸縮變(bian)形(xing)，以吸收管(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)、容(rong)器(qi)等(deng)由(you)熱(re)脹(zhang)冷縮等(deng)原因(yin)而(er)產生的(de)尺(chi)寸變(bian)化(hua)，或(huo)(huo)補(bu)償(chang)管(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)、容(rong)器(qi)等(deng)的(de)軸向、橫向和(he)角向位移。也可用(yong)(yong)于降噪(zao)減(jian)振。在現代工(gong)業中用(yong)(yong)途廣泛。供熱(re)上(shang)，為了防止(zhi)供熱(re)管(guan)(guan)(guan)道(dao)(dao)升(sheng)溫時(shi)，由(you)于熱(re)伸長或(huo)(huo)溫度應(ying)力(li)而(er)引起管(guan)(guan)(guan)道(dao)(dao)變(bian)形(xing)或(huo)(huo)破(po)壞，需要在管(guan)(guan)(guan)道(dao)(dao)上(shang)設置補(bu)償(chang)器(qi)，以補(bu)償(chang)管(guan)(guan)(guan)道(dao)(dao)的(de)熱(re)伸長，從而(er)減(jian)小管(guan)(guan)(guan)壁的(de)應(ying)力(li)和(he)作(zuo)用(yong)(yong)在閥件或(huo)(huo)支架結構(gou)上(shang)的(de)作(zuo)用(yong)(yong)力(li)。