補償(chang)器習慣上(shang)(shang)(shang)也(ye)叫膨脹節，或伸縮節。由構(gou)成(cheng)其工(gong)(gong)作(zuo)主體(ti)的(de)(de)波(bo)紋管(guan)(guan)(guan)(guan)（一種(zhong)彈性元件）和(he)端管(guan)(guan)(guan)(guan)、支架(jia)、法蘭(lan)、導(dao)管(guan)(guan)(guan)(guan)等(deng)附件組成(cheng)。 屬于(yu)(yu)一種(zhong)補償(chang)元件。利用(yong)(yong)其工(gong)(gong)作(zuo)主體(ti)波(bo)紋管(guan)(guan)(guan)(guan)的(de)(de)有(you)效伸縮變(bian)形(xing)(xing)，以(yi)吸(xi)收管(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)、容器等(deng)由熱(re)(re)脹冷縮等(deng)原(yuan)因(yin)而(er)產生的(de)(de)尺寸變(bian)化，或補償(chang)管(guan)(guan)(guan)(guan)線、導(dao)管(guan)(guan)(guan)(guan)、容器等(deng)的(de)(de)軸向、橫向和(he)角向位移。也(ye)可(ke)用(yong)(yong)于(yu)(yu)降噪減(jian)振。在現(xian)代工(gong)(gong)業中用(yong)(yong)途廣泛(fan)。供熱(re)(re)上(shang)(shang)(shang)，為了防止(zhi)供熱(re)(re)管(guan)(guan)(guan)(guan)道升溫時，由于(yu)(yu)熱(re)(re)伸長或溫度(du)應力而(er)引(yin)起管(guan)(guan)(guan)(guan)道變(bian)形(xing)(xing)或破壞，需(xu)要在管(guan)(guan)(guan)(guan)道上(shang)(shang)(shang)設置補償(chang)器，以(yi)補償(chang)管(guan)(guan)(guan)(guan)道的(de)(de)熱(re)(re)伸長，從而(er)減(jian)小管(guan)(guan)(guan)(guan)壁(bi)的(de)(de)應力和(he)作(zuo)用(yong)(yong)在閥件或支架(jia)結構(gou)上(shang)(shang)(shang)的(de)(de)作(zuo)用(yong)(yong)力。