補(bu)(bu)償(chang)(chang)器習慣上(shang)(shang)也叫膨脹(zhang)節，或(huo)伸(shen)縮(suo)節。由(you)構成其(qi)工作主體(ti)的(de)(de)波(bo)紋管(guan)(guan)(guan)（一種彈性元件(jian)(jian)）和端管(guan)(guan)(guan)、支架、法蘭、導(dao)管(guan)(guan)(guan)等(deng)附件(jian)(jian)組(zu)成。 屬(shu)于(yu)一種補(bu)(bu)償(chang)(chang)元件(jian)(jian)。利用(yong)(yong)其(qi)工作主體(ti)波(bo)紋管(guan)(guan)(guan)的(de)(de)有效伸(shen)縮(suo)變形(xing)(xing)，以(yi)吸收管(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)、容(rong)器等(deng)由(you)熱(re)(re)脹(zhang)冷(leng)縮(suo)等(deng)原(yuan)因而產生的(de)(de)尺寸(cun)變化(hua)，或(huo)補(bu)(bu)償(chang)(chang)管(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)、容(rong)器等(deng)的(de)(de)軸向(xiang)、橫向(xiang)和角向(xiang)位(wei)移。也可用(yong)(yong)于(yu)降(jiang)噪減振(zhen)。在(zai)現代工業中用(yong)(yong)途廣泛。供熱(re)(re)上(shang)(shang)，為了(le)防止供熱(re)(re)管(guan)(guan)(guan)道升溫時(shi)，由(you)于(yu)熱(re)(re)伸(shen)長(chang)或(huo)溫度應力而引起管(guan)(guan)(guan)道變形(xing)(xing)或(huo)破壞，需要(yao)在(zai)管(guan)(guan)(guan)道上(shang)(shang)設(she)置補(bu)(bu)償(chang)(chang)器，以(yi)補(bu)(bu)償(chang)(chang)管(guan)(guan)(guan)道的(de)(de)熱(re)(re)伸(shen)長(chang)，從而減小(xiao)管(guan)(guan)(guan)壁的(de)(de)應力和作用(yong)(yong)在(zai)閥件(jian)(jian)或(huo)支架結構上(shang)(shang)的(de)(de)作用(yong)(yong)力。