補償(chang)器習慣(guan)上(shang)(shang)也叫膨(peng)脹節，或伸(shen)(shen)縮節。由構(gou)成其工(gong)(gong)作(zuo)主(zhu)(zhu)體的(de)波(bo)(bo)紋管(guan)(guan)(guan)(guan)（一種彈性元(yuan)件(jian)(jian)）和端(duan)管(guan)(guan)(guan)(guan)、支(zhi)架(jia)(jia)、法蘭(lan)、導(dao)管(guan)(guan)(guan)(guan)等(deng)附(fu)件(jian)(jian)組成。 屬于(yu)一種補償(chang)元(yuan)件(jian)(jian)。利用(yong)(yong)其工(gong)(gong)作(zuo)主(zhu)(zhu)體波(bo)(bo)紋管(guan)(guan)(guan)(guan)的(de)有效(xiao)伸(shen)(shen)縮變形(xing)，以(yi)吸收管(guan)(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)(guan)、容器等(deng)由熱(re)脹冷縮等(deng)原因而產生的(de)尺寸(cun)變化，或補償(chang)管(guan)(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)(guan)、容器等(deng)的(de)軸向、橫向和角向位(wei)移。也可用(yong)(yong)于(yu)降(jiang)噪(zao)減(jian)振(zhen)。在(zai)現代工(gong)(gong)業(ye)中用(yong)(yong)途(tu)廣泛。供熱(re)上(shang)(shang)，為了防止(zhi)供熱(re)管(guan)(guan)(guan)(guan)道(dao)升溫(wen)時，由于(yu)熱(re)伸(shen)(shen)長或溫(wen)度應力(li)而引(yin)起(qi)管(guan)(guan)(guan)(guan)道(dao)變形(xing)或破壞，需要在(zai)管(guan)(guan)(guan)(guan)道(dao)上(shang)(shang)設置補償(chang)器，以(yi)補償(chang)管(guan)(guan)(guan)(guan)道(dao)的(de)熱(re)伸(shen)(shen)長，從(cong)而減(jian)小(xiao)管(guan)(guan)(guan)(guan)壁(bi)的(de)應力(li)和作(zuo)用(yong)(yong)在(zai)閥(fa)件(jian)(jian)或支(zhi)架(jia)(jia)結(jie)構(gou)上(shang)(shang)的(de)作(zuo)用(yong)(yong)力(li)。