補(bu)(bu)償(chang)器習慣(guan)上(shang)也叫膨脹(zhang)節，或(huo)伸縮(suo)節。由(you)構成其(qi)(qi)工作(zuo)主(zhu)體(ti)的(de)(de)波(bo)紋(wen)管(guan)(guan)(guan)(guan)(guan)（一種(zhong)彈性(xing)元(yuan)件(jian)）和端管(guan)(guan)(guan)(guan)(guan)、支(zhi)架、法蘭、導管(guan)(guan)(guan)(guan)(guan)等附件(jian)組成。 屬(shu)于一種(zhong)補(bu)(bu)償(chang)元(yuan)件(jian)。利用(yong)其(qi)(qi)工作(zuo)主(zhu)體(ti)波(bo)紋(wen)管(guan)(guan)(guan)(guan)(guan)的(de)(de)有效(xiao)伸縮(suo)變(bian)形(xing)，以吸(xi)收管(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)、容器等由(you)熱(re)脹(zhang)冷(leng)縮(suo)等原(yuan)因而產生(sheng)的(de)(de)尺寸(cun)變(bian)化，或(huo)補(bu)(bu)償(chang)管(guan)(guan)(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)(guan)(guan)、容器等的(de)(de)軸向(xiang)、橫向(xiang)和角(jiao)向(xiang)位移。也可用(yong)于降噪減(jian)振(zhen)。在(zai)現代(dai)工業(ye)中用(yong)途廣泛。供熱(re)上(shang)，為了防止供熱(re)管(guan)(guan)(guan)(guan)(guan)道升(sheng)溫時，由(you)于熱(re)伸長(chang)或(huo)溫度應(ying)力而引(yin)起管(guan)(guan)(guan)(guan)(guan)道變(bian)形(xing)或(huo)破壞，需(xu)要在(zai)管(guan)(guan)(guan)(guan)(guan)道上(shang)設置補(bu)(bu)償(chang)器，以補(bu)(bu)償(chang)管(guan)(guan)(guan)(guan)(guan)道的(de)(de)熱(re)伸長(chang)，從而減(jian)小(xiao)管(guan)(guan)(guan)(guan)(guan)壁(bi)的(de)(de)應(ying)力和作(zuo)用(yong)在(zai)閥件(jian)或(huo)支(zhi)架結構上(shang)的(de)(de)作(zuo)用(yong)力。