補(bu)(bu)償器習慣上(shang)也叫膨脹節，或伸(shen)縮節。由(you)構(gou)成其工(gong)作主(zhu)體的(de)(de)波紋(wen)(wen)管(guan)(guan)（一(yi)種彈性(xing)元件(jian)(jian)）和端(duan)管(guan)(guan)、支(zhi)架(jia)、法蘭、導管(guan)(guan)等(deng)(deng)附件(jian)(jian)組成。 屬于(yu)一(yi)種補(bu)(bu)償元件(jian)(jian)。利用(yong)(yong)(yong)其工(gong)作主(zhu)體波紋(wen)(wen)管(guan)(guan)的(de)(de)有效伸(shen)縮變形，以吸收管(guan)(guan)線(xian)、導管(guan)(guan)、容(rong)器等(deng)(deng)由(you)熱脹冷縮等(deng)(deng)原因(yin)而產生的(de)(de)尺(chi)寸(cun)變化，或補(bu)(bu)償管(guan)(guan)線(xian)、導管(guan)(guan)、容(rong)器等(deng)(deng)的(de)(de)軸向、橫向和角(jiao)向位移(yi)。也可用(yong)(yong)(yong)于(yu)降噪減振。在現代工(gong)業(ye)中用(yong)(yong)(yong)途廣泛。供熱上(shang)，為了防止(zhi)供熱管(guan)(guan)道升(sheng)溫(wen)時，由(you)于(yu)熱伸(shen)長或溫(wen)度應力(li)(li)而引(yin)起管(guan)(guan)道變形或破壞，需要在管(guan)(guan)道上(shang)設置補(bu)(bu)償器，以補(bu)(bu)償管(guan)(guan)道的(de)(de)熱伸(shen)長，從(cong)而減小(xiao)管(guan)(guan)壁的(de)(de)應力(li)(li)和作用(yong)(yong)(yong)在閥件(jian)(jian)或支(zhi)架(jia)結(jie)構(gou)上(shang)的(de)(de)作用(yong)(yong)(yong)力(li)(li)。