補(bu)(bu)(bu)償器習慣(guan)上(shang)也(ye)叫膨脹節(jie)，或(huo)伸縮節(jie)。由(you)構(gou)成(cheng)其工(gong)作主體的(de)(de)波紋管(guan)(guan)(guan)(guan)（一種(zhong)彈性(xing)元件(jian)）和(he)(he)端管(guan)(guan)(guan)(guan)、支(zhi)架(jia)、法(fa)蘭(lan)、導管(guan)(guan)(guan)(guan)等(deng)附件(jian)組成(cheng)。 屬于(yu)一種(zhong)補(bu)(bu)(bu)償元件(jian)。利用其工(gong)作主體波紋管(guan)(guan)(guan)(guan)的(de)(de)有(you)效伸縮變(bian)(bian)(bian)形，以吸(xi)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)(er)產生的(de)(de)尺寸變(bian)(bian)(bian)化(hua)，或(huo)補(bu)(bu)(bu)償管(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)、容(rong)器等(deng)的(de)(de)軸向、橫向和(he)(he)角(jiao)向位(wei)移。也(ye)可用于(yu)降(jiang)噪減(jian)振。在(zai)(zai)現代工(gong)業中用途(tu)廣(guang)泛。供熱上(shang)，為了防(fang)止(zhi)供熱管(guan)(guan)(guan)(guan)道升溫時(shi)，由(you)于(yu)熱伸長(chang)或(huo)溫度應力而(er)(er)引起(qi)管(guan)(guan)(guan)(guan)道變(bian)(bian)(bian)形或(huo)破壞(huai)，需(xu)要在(zai)(zai)管(guan)(guan)(guan)(guan)道上(shang)設置(zhi)補(bu)(bu)(bu)償器，以補(bu)(bu)(bu)償管(guan)(guan)(guan)(guan)道的(de)(de)熱伸長(chang)，從而(er)(er)減(jian)小(xiao)管(guan)(guan)(guan)(guan)壁的(de)(de)應力和(he)(he)作用在(zai)(zai)閥件(jian)或(huo)支(zhi)架(jia)結構(gou)上(shang)的(de)(de)作用力。