補(bu)(bu)償(chang)(chang)器習慣上(shang)(shang)也(ye)叫(jiao)膨脹節，或伸(shen)縮節。由(you)構(gou)成(cheng)其工(gong)作主體的(de)(de)波紋管(guan)(guan)(guan)(guan)（一(yi)種(zhong)彈性元(yuan)件(jian)(jian)(jian)）和(he)(he)端(duan)管(guan)(guan)(guan)(guan)、支架(jia)、法蘭、導(dao)(dao)管(guan)(guan)(guan)(guan)等(deng)附(fu)件(jian)(jian)(jian)組成(cheng)。 屬于(yu)一(yi)種(zhong)補(bu)(bu)償(chang)(chang)元(yuan)件(jian)(jian)(jian)。利用(yong)其工(gong)作主體波紋管(guan)(guan)(guan)(guan)的(de)(de)有效伸(shen)縮變(bian)形，以吸收管(guan)(guan)(guan)(guan)線、導(dao)(dao)管(guan)(guan)(guan)(guan)、容(rong)器等(deng)由(you)熱脹冷縮等(deng)原因而(er)(er)產生的(de)(de)尺寸變(bian)化(hua)，或補(bu)(bu)償(chang)(chang)管(guan)(guan)(guan)(guan)線、導(dao)(dao)管(guan)(guan)(guan)(guan)、容(rong)器等(deng)的(de)(de)軸向、橫向和(he)(he)角(jiao)向位移。也(ye)可用(yong)于(yu)降噪減(jian)(jian)振。在(zai)現代工(gong)業中用(yong)途廣泛。供(gong)(gong)熱上(shang)(shang)，為(wei)了防(fang)止供(gong)(gong)熱管(guan)(guan)(guan)(guan)道(dao)升溫時，由(you)于(yu)熱伸(shen)長(chang)或溫度應力(li)而(er)(er)引起管(guan)(guan)(guan)(guan)道(dao)變(bian)形或破壞(huai)，需(xu)要在(zai)管(guan)(guan)(guan)(guan)道(dao)上(shang)(shang)設(she)置補(bu)(bu)償(chang)(chang)器，以補(bu)(bu)償(chang)(chang)管(guan)(guan)(guan)(guan)道(dao)的(de)(de)熱伸(shen)長(chang)，從而(er)(er)減(jian)(jian)小(xiao)管(guan)(guan)(guan)(guan)壁的(de)(de)應力(li)和(he)(he)作用(yong)在(zai)閥件(jian)(jian)(jian)或支架(jia)結構(gou)上(shang)(shang)的(de)(de)作用(yong)力(li)。