補(bu)(bu)償器(qi)(qi)習慣上也叫膨(peng)脹節(jie)，或(huo)伸(shen)縮(suo)(suo)節(jie)。由構成其(qi)工(gong)(gong)作(zuo)主(zhu)體(ti)的波紋(wen)管(guan)（一種彈性元(yuan)件(jian)）和(he)端管(guan)、支架、法蘭、導管(guan)等(deng)(deng)附(fu)件(jian)組成。 屬于(yu)一種補(bu)(bu)償元(yuan)件(jian)。利用(yong)(yong)(yong)其(qi)工(gong)(gong)作(zuo)主(zhu)體(ti)波紋(wen)管(guan)的有(you)效(xiao)伸(shen)縮(suo)(suo)變(bian)形(xing)，以吸收管(guan)線(xian)、導管(guan)、容(rong)器(qi)(qi)等(deng)(deng)由熱(re)(re)脹冷縮(suo)(suo)等(deng)(deng)原因而產生的尺(chi)寸(cun)變(bian)化，或(huo)補(bu)(bu)償管(guan)線(xian)、導管(guan)、容(rong)器(qi)(qi)等(deng)(deng)的軸向、橫向和(he)角向位移(yi)。也可用(yong)(yong)(yong)于(yu)降噪減振。在(zai)現代工(gong)(gong)業(ye)中用(yong)(yong)(yong)途廣泛(fan)。供熱(re)(re)上，為了防止供熱(re)(re)管(guan)道(dao)(dao)升(sheng)溫(wen)時，由于(yu)熱(re)(re)伸(shen)長或(huo)溫(wen)度應(ying)力而引起管(guan)道(dao)(dao)變(bian)形(xing)或(huo)破(po)壞，需要在(zai)管(guan)道(dao)(dao)上設(she)置補(bu)(bu)償器(qi)(qi)，以補(bu)(bu)償管(guan)道(dao)(dao)的熱(re)(re)伸(shen)長，從(cong)而減小管(guan)壁(bi)的應(ying)力和(he)作(zuo)用(yong)(yong)(yong)在(zai)閥件(jian)或(huo)支架結構上的作(zuo)用(yong)(yong)(yong)力。