補償(chang)器(qi)習(xi)慣(guan)上(shang)也叫膨脹節(jie)，或(huo)伸(shen)縮(suo)節(jie)。由(you)構成其(qi)工作(zuo)(zuo)主體的(de)(de)波(bo)紋(wen)管(guan)(guan)(guan)(guan)(guan)（一種(zhong)彈性(xing)元件(jian)）和端管(guan)(guan)(guan)(guan)(guan)、支架(jia)、法(fa)蘭、導管(guan)(guan)(guan)(guan)(guan)等附(fu)件(jian)組成。 屬(shu)于(yu)一種(zhong)補償(chang)元件(jian)。利用(yong)其(qi)工作(zuo)(zuo)主體波(bo)紋(wen)管(guan)(guan)(guan)(guan)(guan)的(de)(de)有(you)效伸(shen)縮(suo)變(bian)(bian)(bian)形，以吸收管(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)、容(rong)器(qi)等由(you)熱(re)(re)脹冷縮(suo)等原(yuan)因而(er)(er)產生的(de)(de)尺寸變(bian)(bian)(bian)化，或(huo)補償(chang)管(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)、容(rong)器(qi)等的(de)(de)軸向、橫向和角向位移(yi)。也可用(yong)于(yu)降噪減振。在現代(dai)工業中用(yong)途廣泛。供(gong)熱(re)(re)上(shang)，為了防止供(gong)熱(re)(re)管(guan)(guan)(guan)(guan)(guan)道(dao)升溫時，由(you)于(yu)熱(re)(re)伸(shen)長或(huo)溫度應(ying)力(li)而(er)(er)引起(qi)管(guan)(guan)(guan)(guan)(guan)道(dao)變(bian)(bian)(bian)形或(huo)破壞，需(xu)要在管(guan)(guan)(guan)(guan)(guan)道(dao)上(shang)設置補償(chang)器(qi)，以補償(chang)管(guan)(guan)(guan)(guan)(guan)道(dao)的(de)(de)熱(re)(re)伸(shen)長，從而(er)(er)減小管(guan)(guan)(guan)(guan)(guan)壁的(de)(de)應(ying)力(li)和作(zuo)(zuo)用(yong)在閥件(jian)或(huo)支架(jia)結構上(shang)的(de)(de)作(zuo)(zuo)用(yong)力(li)。