補(bu)(bu)償(chang)器習慣上(shang)也(ye)(ye)叫(jiao)膨(peng)脹(zhang)節，或伸縮節。由(you)構成其(qi)工作主體的(de)(de)波(bo)紋管(guan)(guan)(guan)(guan)（一種(zhong)彈性元件(jian)(jian)(jian)）和(he)(he)端管(guan)(guan)(guan)(guan)、支(zhi)架(jia)、法蘭(lan)、導(dao)管(guan)(guan)(guan)(guan)等附件(jian)(jian)(jian)組成。 屬于(yu)一種(zhong)補(bu)(bu)償(chang)元件(jian)(jian)(jian)。利(li)用(yong)其(qi)工作主體波(bo)紋管(guan)(guan)(guan)(guan)的(de)(de)有效伸縮變(bian)形，以吸收管(guan)(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)(guan)、容器等由(you)熱(re)脹(zhang)冷(leng)縮等原因而產生的(de)(de)尺寸變(bian)化，或補(bu)(bu)償(chang)管(guan)(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)(guan)、容器等的(de)(de)軸向(xiang)(xiang)、橫向(xiang)(xiang)和(he)(he)角向(xiang)(xiang)位移。也(ye)(ye)可用(yong)于(yu)降噪(zao)減振。在現(xian)代工業中用(yong)途廣泛(fan)。供熱(re)上(shang)，為了防止供熱(re)管(guan)(guan)(guan)(guan)道(dao)升溫時，由(you)于(yu)熱(re)伸長或溫度應(ying)力(li)而引起(qi)管(guan)(guan)(guan)(guan)道(dao)變(bian)形或破壞，需(xu)要在管(guan)(guan)(guan)(guan)道(dao)上(shang)設(she)置(zhi)補(bu)(bu)償(chang)器，以補(bu)(bu)償(chang)管(guan)(guan)(guan)(guan)道(dao)的(de)(de)熱(re)伸長，從而減小管(guan)(guan)(guan)(guan)壁(bi)的(de)(de)應(ying)力(li)和(he)(he)作用(yong)在閥件(jian)(jian)(jian)或支(zhi)架(jia)結構上(shang)的(de)(de)作用(yong)力(li)。