補(bu)償器習慣(guan)上也(ye)叫(jiao)膨脹節，或(huo)伸縮(suo)節。由構成(cheng)其(qi)工(gong)(gong)作主體(ti)的波紋(wen)管(guan)(guan)(guan)(guan)(guan)（一種彈性元件）和端(duan)管(guan)(guan)(guan)(guan)(guan)、支架、法蘭(lan)、導管(guan)(guan)(guan)(guan)(guan)等(deng)(deng)附件組成(cheng)。 屬于一種補(bu)償元件。利用(yong)其(qi)工(gong)(gong)作主體(ti)波紋(wen)管(guan)(guan)(guan)(guan)(guan)的有效(xiao)伸縮(suo)變(bian)形，以吸(xi)收(shou)管(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)、容器等(deng)(deng)由熱(re)脹冷縮(suo)等(deng)(deng)原(yuan)因(yin)而(er)產生的尺(chi)寸(cun)變(bian)化，或(huo)補(bu)償管(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)、容器等(deng)(deng)的軸向、橫向和角向位移。也(ye)可用(yong)于降噪減(jian)振。在(zai)現代(dai)工(gong)(gong)業中(zhong)用(yong)途廣(guang)泛。供熱(re)上，為了防(fang)止供熱(re)管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)升溫(wen)時，由于熱(re)伸長或(huo)溫(wen)度應(ying)力而(er)引起管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)變(bian)形或(huo)破壞，需要在(zai)管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)上設(she)置補(bu)償器，以補(bu)償管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)的熱(re)伸長，從而(er)減(jian)小(xiao)管(guan)(guan)(guan)(guan)(guan)壁的應(ying)力和作用(yong)在(zai)閥件或(huo)支架結(jie)構上的作用(yong)力。