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 屬于一種補(bu)償(chang)元(yuan)件。利用(yong)(yong)(yong)其工(gong)作主體波紋管(guan)(guan)(guan)(guan)的(de)(de)有效伸縮變形(xing)，以(yi)吸收管(guan)(guan)(guan)(guan)線、導(dao)(dao)管(guan)(guan)(guan)(guan)、容器(qi)等由熱(re)脹冷縮等原(yuan)因而(er)(er)產生的(de)(de)尺寸(cun)變化，或補(bu)償(chang)管(guan)(guan)(guan)(guan)線、導(dao)(dao)管(guan)(guan)(guan)(guan)、容器(qi)等的(de)(de)軸(zhou)向、橫(heng)向和角向位移。也(ye)可用(yong)(yong)(yong)于降噪減(jian)振。在現代工(gong)業中用(yong)(yong)(yong)途廣泛。供(gong)熱(re)上，為(wei)了(le)防止供(gong)熱(re)管(guan)(guan)(guan)(guan)道(dao)升溫時，由于熱(re)伸長(chang)或溫度應力而(er)(er)引(yin)起管(guan)(guan)(guan)(guan)道(dao)變形(xing)或破(po)壞，需要在管(guan)(guan)(guan)(guan)道(dao)上設(she)置補(bu)償(chang)器(qi)，以(yi)補(bu)償(chang)管(guan)(guan)(guan)(guan)道(dao)的(de)(de)熱(re)伸長(chang)，從(cong)而(er)(er)減(jian)小(xiao)管(guan)(guan)(guan)(guan)壁(bi)的(de)(de)應力和作用(yong)(yong)(yong)在閥件或支架結構上的(de)(de)作用(yong)(yong)(yong)力。