補(bu)償器(qi)(qi)習慣上(shang)(shang)(shang)也(ye)叫膨(peng)脹節(jie)，或伸(shen)縮節(jie)。由構(gou)成其(qi)工作(zuo)主(zhu)體的(de)(de)(de)波(bo)紋管(guan)(guan)(guan)(guan)（一種彈性元件(jian)(jian)）和(he)端(duan)管(guan)(guan)(guan)(guan)、支架(jia)(jia)、法蘭、導管(guan)(guan)(guan)(guan)等附(fu)件(jian)(jian)組成。 屬于(yu)(yu)一種補(bu)償元件(jian)(jian)。利用(yong)(yong)其(qi)工作(zuo)主(zhu)體波(bo)紋管(guan)(guan)(guan)(guan)的(de)(de)(de)有效伸(shen)縮變形(xing)，以吸(xi)收管(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)、容(rong)器(qi)(qi)等由熱脹冷縮等原因而產(chan)生的(de)(de)(de)尺(chi)寸變化，或補(bu)償管(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)、容(rong)器(qi)(qi)等的(de)(de)(de)軸向、橫向和(he)角(jiao)向位移(yi)。也(ye)可用(yong)(yong)于(yu)(yu)降噪減(jian)振。在(zai)現(xian)代工業中用(yong)(yong)途廣(guang)泛。供熱上(shang)(shang)(shang)，為了(le)防(fang)止供熱管(guan)(guan)(guan)(guan)道升溫(wen)時，由于(yu)(yu)熱伸(shen)長或溫(wen)度應力(li)而引起管(guan)(guan)(guan)(guan)道變形(xing)或破(po)壞，需要(yao)在(zai)管(guan)(guan)(guan)(guan)道上(shang)(shang)(shang)設置補(bu)償器(qi)(qi)，以補(bu)償管(guan)(guan)(guan)(guan)道的(de)(de)(de)熱伸(shen)長，從而減(jian)小(xiao)管(guan)(guan)(guan)(guan)壁(bi)的(de)(de)(de)應力(li)和(he)作(zuo)用(yong)(yong)在(zai)閥件(jian)(jian)或支架(jia)(jia)結構(gou)上(shang)(shang)(shang)的(de)(de)(de)作(zuo)用(yong)(yong)力(li)。