補償(chang)器習慣上(shang)也叫(jiao)膨脹節(jie)，或(huo)(huo)(huo)伸(shen)(shen)(shen)(shen)縮節(jie)。由構(gou)成其工(gong)(gong)作主體的(de)(de)波(bo)紋管(guan)(guan)(guan)（一(yi)種彈性元(yuan)件(jian)）和端管(guan)(guan)(guan)、支(zhi)架(jia)、法蘭、導(dao)管(guan)(guan)(guan)等附件(jian)組成。 屬于一(yi)種補償(chang)元(yuan)件(jian)。利用(yong)(yong)其工(gong)(gong)作主體波(bo)紋管(guan)(guan)(guan)的(de)(de)有(you)效伸(shen)(shen)(shen)(shen)縮變形，以吸收(shou)管(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)、容器等由熱(re)(re)脹冷縮等原因而(er)產生的(de)(de)尺寸變化(hua)，或(huo)(huo)(huo)補償(chang)管(guan)(guan)(guan)線(xian)、導(dao)管(guan)(guan)(guan)、容器等的(de)(de)軸向(xiang)、橫向(xiang)和角向(xiang)位移。也可用(yong)(yong)于降噪減振(zhen)。在(zai)現代工(gong)(gong)業中用(yong)(yong)途廣泛。供(gong)熱(re)(re)上(shang)，為了防止供(gong)熱(re)(re)管(guan)(guan)(guan)道(dao)升溫時，由于熱(re)(re)伸(shen)(shen)(shen)(shen)長或(huo)(huo)(huo)溫度應力而(er)引起管(guan)(guan)(guan)道(dao)變形或(huo)(huo)(huo)破壞，需要在(zai)管(guan)(guan)(guan)道(dao)上(shang)設置補償(chang)器，以補償(chang)管(guan)(guan)(guan)道(dao)的(de)(de)熱(re)(re)伸(shen)(shen)(shen)(shen)長，從(cong)而(er)減小(xiao)管(guan)(guan)(guan)壁的(de)(de)應力和作用(yong)(yong)在(zai)閥件(jian)或(huo)(huo)(huo)支(zhi)架(jia)結(jie)構(gou)上(shang)的(de)(de)作用(yong)(yong)力。