補(bu)(bu)償器(qi)習慣(guan)上(shang)(shang)也叫膨脹節(jie)，或(huo)伸(shen)縮(suo)節(jie)。由構成其工(gong)(gong)作(zuo)主體(ti)的波紋管(guan)(guan)(guan)（一種彈性(xing)元件）和(he)端(duan)管(guan)(guan)(guan)、支(zhi)架(jia)、法蘭、導(dao)管(guan)(guan)(guan)等(deng)附件組(zu)成。 屬于(yu)(yu)(yu)一種補(bu)(bu)償元件。利(li)用(yong)(yong)其工(gong)(gong)作(zuo)主體(ti)波紋管(guan)(guan)(guan)的有效伸(shen)縮(suo)變形，以吸(xi)收管(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)、容器(qi)等(deng)由熱脹冷(leng)縮(suo)等(deng)原因(yin)而產生的尺寸變化，或(huo)補(bu)(bu)償管(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)、容器(qi)等(deng)的軸向、橫向和(he)角向位(wei)移。也可(ke)用(yong)(yong)于(yu)(yu)(yu)降噪減(jian)振。在現代工(gong)(gong)業中用(yong)(yong)途(tu)廣(guang)泛(fan)。供熱上(shang)(shang)，為了防止供熱管(guan)(guan)(guan)道升溫時，由于(yu)(yu)(yu)熱伸(shen)長或(huo)溫度應(ying)力而引(yin)起管(guan)(guan)(guan)道變形或(huo)破(po)壞(huai)，需(xu)要在管(guan)(guan)(guan)道上(shang)(shang)設置(zhi)補(bu)(bu)償器(qi)，以補(bu)(bu)償管(guan)(guan)(guan)道的熱伸(shen)長，從而減(jian)小(xiao)管(guan)(guan)(guan)壁的應(ying)力和(he)作(zuo)用(yong)(yong)在閥件或(huo)支(zhi)架(jia)結構上(shang)(shang)的作(zuo)用(yong)(yong)力。