補(bu)償(chang)器(qi)習慣(guan)上也叫膨(peng)脹節，或(huo)伸縮(suo)節。由(you)構(gou)成其工作(zuo)(zuo)主體的(de)(de)波紋管(guan)(guan)(guan)(guan)(guan)(guan)(guan)（一種彈(dan)性元(yuan)件）和端管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、支(zhi)架(jia)、法蘭、導管(guan)(guan)(guan)(guan)(guan)(guan)(guan)等附件組成。 屬于一種補(bu)償(chang)元(yuan)件。利用(yong)(yong)其工作(zuo)(zuo)主體波紋管(guan)(guan)(guan)(guan)(guan)(guan)(guan)的(de)(de)有效伸縮(suo)變形(xing)，以(yi)吸收管(guan)(guan)(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、容(rong)器(qi)等由(you)熱(re)脹冷縮(suo)等原因而產(chan)生(sheng)的(de)(de)尺(chi)寸變化，或(huo)補(bu)償(chang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)(guan)(guan)、容(rong)器(qi)等的(de)(de)軸(zhou)向(xiang)、橫(heng)向(xiang)和角向(xiang)位(wei)移。也可(ke)用(yong)(yong)于降噪減(jian)(jian)振。在(zai)現代工業中(zhong)用(yong)(yong)途廣泛。供(gong)熱(re)上，為了防(fang)止供(gong)熱(re)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道(dao)升溫(wen)時，由(you)于熱(re)伸長或(huo)溫(wen)度應力而引起管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道(dao)變形(xing)或(huo)破壞(huai)，需(xu)要在(zai)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道(dao)上設置(zhi)補(bu)償(chang)器(qi)，以(yi)補(bu)償(chang)管(guan)(guan)(guan)(guan)(guan)(guan)(guan)道(dao)的(de)(de)熱(re)伸長，從而減(jian)(jian)小管(guan)(guan)(guan)(guan)(guan)(guan)(guan)壁的(de)(de)應力和作(zuo)(zuo)用(yong)(yong)在(zai)閥件或(huo)支(zhi)架(jia)結構(gou)上的(de)(de)作(zuo)(zuo)用(yong)(yong)力。