補(bu)(bu)償(chang)器(qi)(qi)習慣(guan)上(shang)也叫膨(peng)脹節，或伸縮(suo)節。由(you)(you)構成(cheng)其工(gong)(gong)(gong)作主體的波紋管(guan)(guan)（一種彈性元(yuan)件(jian)(jian)）和端管(guan)(guan)、支架、法蘭、導管(guan)(guan)等(deng)附件(jian)(jian)組成(cheng)。 屬于一種補(bu)(bu)償(chang)元(yuan)件(jian)(jian)。利用其工(gong)(gong)(gong)作主體波紋管(guan)(guan)的有效伸縮(suo)變形，以吸收(shou)管(guan)(guan)線(xian)、導管(guan)(guan)、容(rong)器(qi)(qi)等(deng)由(you)(you)熱(re)脹冷(leng)縮(suo)等(deng)原因而產生的尺寸變化，或補(bu)(bu)償(chang)管(guan)(guan)線(xian)、導管(guan)(guan)、容(rong)器(qi)(qi)等(deng)的軸向、橫(heng)向和角向位移。也可(ke)用于降噪減(jian)振(zhen)。在現(xian)代工(gong)(gong)(gong)業中用途廣泛。供熱(re)上(shang)，為了(le)防止供熱(re)管(guan)(guan)道(dao)升溫時(shi)，由(you)(you)于熱(re)伸長或溫度應(ying)力(li)而引起管(guan)(guan)道(dao)變形或破壞(huai)，需要在管(guan)(guan)道(dao)上(shang)設置補(bu)(bu)償(chang)器(qi)(qi)，以補(bu)(bu)償(chang)管(guan)(guan)道(dao)的熱(re)伸長，從而減(jian)小管(guan)(guan)壁的應(ying)力(li)和作用在閥(fa)件(jian)(jian)或支架結構上(shang)的作用力(li)。