補(bu)償(chang)(chang)器(qi)習(xi)慣(guan)上(shang)也叫膨(peng)脹(zhang)節，或(huo)(huo)伸縮(suo)節。由(you)構(gou)成(cheng)其工(gong)作主(zhu)體的(de)(de)波紋管(guan)(guan)(guan)(guan)(guan)（一種彈性(xing)元件(jian)）和端(duan)管(guan)(guan)(guan)(guan)(guan)、支架、法蘭、導(dao)管(guan)(guan)(guan)(guan)(guan)等(deng)附件(jian)組成(cheng)。 屬于一種補(bu)償(chang)(chang)元件(jian)。利用(yong)其工(gong)作主(zhu)體波紋管(guan)(guan)(guan)(guan)(guan)的(de)(de)有效伸縮(suo)變(bian)形，以吸收管(guan)(guan)(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)(guan)(guan)、容器(qi)等(deng)由(you)熱(re)脹(zhang)冷縮(suo)等(deng)原因(yin)而(er)產生的(de)(de)尺寸變(bian)化(hua)，或(huo)(huo)補(bu)償(chang)(chang)管(guan)(guan)(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)(guan)(guan)、容器(qi)等(deng)的(de)(de)軸(zhou)向(xiang)(xiang)、橫向(xiang)(xiang)和角向(xiang)(xiang)位移。也可(ke)用(yong)于降(jiang)噪減振。在(zai)現代工(gong)業中(zhong)用(yong)途廣泛(fan)。供(gong)熱(re)上(shang)，為了防止(zhi)供(gong)熱(re)管(guan)(guan)(guan)(guan)(guan)道(dao)升溫時，由(you)于熱(re)伸長或(huo)(huo)溫度應(ying)力而(er)引起管(guan)(guan)(guan)(guan)(guan)道(dao)變(bian)形或(huo)(huo)破壞，需要在(zai)管(guan)(guan)(guan)(guan)(guan)道(dao)上(shang)設置補(bu)償(chang)(chang)器(qi)，以補(bu)償(chang)(chang)管(guan)(guan)(guan)(guan)(guan)道(dao)的(de)(de)熱(re)伸長，從而(er)減小管(guan)(guan)(guan)(guan)(guan)壁的(de)(de)應(ying)力和作用(yong)在(zai)閥(fa)件(jian)或(huo)(huo)支架結構(gou)上(shang)的(de)(de)作用(yong)力。