補(bu)償(chang)器習慣上也(ye)叫膨脹節，或伸縮節。由(you)構(gou)成(cheng)其(qi)工(gong)作(zuo)主體的(de)(de)(de)波紋(wen)管(guan)(guan)(guan)(guan)（一種彈性(xing)元(yuan)件(jian)(jian)）和端管(guan)(guan)(guan)(guan)、支架、法蘭(lan)、導管(guan)(guan)(guan)(guan)等(deng)附件(jian)(jian)組成(cheng)。 屬于(yu)一種補(bu)償(chang)元(yuan)件(jian)(jian)。利用(yong)其(qi)工(gong)作(zuo)主體波紋(wen)管(guan)(guan)(guan)(guan)的(de)(de)(de)有(you)效(xiao)伸縮變(bian)形，以(yi)(yi)吸收(shou)管(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)、容(rong)器等(deng)由(you)熱脹冷縮等(deng)原因而(er)產(chan)生(sheng)的(de)(de)(de)尺寸(cun)變(bian)化，或補(bu)償(chang)管(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)、容(rong)器等(deng)的(de)(de)(de)軸向(xiang)、橫向(xiang)和角向(xiang)位移(yi)。也(ye)可用(yong)于(yu)降噪減振。在(zai)現代工(gong)業中用(yong)途廣泛(fan)。供(gong)熱上，為了防止(zhi)供(gong)熱管(guan)(guan)(guan)(guan)道(dao)升溫時(shi)，由(you)于(yu)熱伸長或溫度應(ying)力而(er)引起(qi)管(guan)(guan)(guan)(guan)道(dao)變(bian)形或破壞，需(xu)要在(zai)管(guan)(guan)(guan)(guan)道(dao)上設置(zhi)補(bu)償(chang)器，以(yi)(yi)補(bu)償(chang)管(guan)(guan)(guan)(guan)道(dao)的(de)(de)(de)熱伸長，從而(er)減小管(guan)(guan)(guan)(guan)壁的(de)(de)(de)應(ying)力和作(zuo)用(yong)在(zai)閥件(jian)(jian)或支架結構(gou)上的(de)(de)(de)作(zuo)用(yong)力。