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(yi)種補(bu)償(chang)(chang)元件。利用(yong)(yong)其工(gong)作(zuo)主體波紋(wen)管(guan)(guan)(guan)的(de)有效伸縮(suo)變(bian)形，以吸收管(guan)(guan)(guan)線、導(dao)(dao)管(guan)(guan)(guan)、容(rong)(rong)器(qi)(qi)等由熱脹(zhang)冷縮(suo)等原因而(er)(er)產生的(de)尺(chi)寸變(bian)化，或補(bu)償(chang)(chang)管(guan)(guan)(guan)線、導(dao)(dao)管(guan)(guan)(guan)、容(rong)(rong)器(qi)(qi)等的(de)軸向(xiang)、橫向(xiang)和(he)角向(xiang)位移。也可用(yong)(yong)于降噪減(jian)(jian)振。在(zai)現代工(gong)業中用(yong)(yong)途(tu)廣泛。供(gong)熱上(shang)，為(wei)了防止(zhi)供(gong)熱管(guan)(guan)(guan)道升溫時，由于熱伸長(chang)或溫度應(ying)力而(er)(er)引起管(guan)(guan)(guan)道變(bian)形或破壞，需要在(zai)管(guan)(guan)(guan)道上(shang)設置(zhi)補(bu)償(chang)(chang)器(qi)(qi)，以補(bu)償(chang)(chang)管(guan)(guan)(guan)道的(de)熱伸長(chang)，從而(er)(er)減(jian)(jian)小(xiao)管(guan)(guan)(guan)壁的(de)應(ying)力和(he)作(zuo)用(yong)(yong)在(zai)閥件或支架結構(gou)上(shang)的(de)作(zuo)用(yong)(yong)力。