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(bu)償(chang)(chang)元件。利用(yong)其工(gong)作主(zhu)體波紋管(guan)(guan)(guan)的有效(xiao)伸(shen)縮變(bian)形，以吸收管(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)、容器等(deng)由熱脹冷縮等(deng)原(yuan)因而產生的尺寸變(bian)化，或補(bu)償(chang)(chang)管(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)、容器等(deng)的軸(zhou)向、橫向和角向位(wei)移。也(ye)可用(yong)于降(jiang)噪減(jian)(jian)振。在(zai)現代(dai)工(gong)業(ye)中用(yong)途廣泛(fan)。供熱上(shang)，為(wei)了防止供熱管(guan)(guan)(guan)道(dao)升(sheng)溫時，由于熱伸(shen)長或溫度應(ying)力而引起管(guan)(guan)(guan)道(dao)變(bian)形或破(po)壞，需要在(zai)管(guan)(guan)(guan)道(dao)上(shang)設置(zhi)補(bu)償(chang)(chang)器，以補(bu)償(chang)(chang)管(guan)(guan)(guan)道(dao)的熱伸(shen)長，從(cong)而減(jian)(jian)小(xiao)管(guan)(guan)(guan)壁的應(ying)力和作用(yong)在(zai)閥(fa)件或支架結構上(shang)的作用(yong)力。