補(bu)(bu)(bu)償(chang)器習慣上(shang)也叫膨脹節，或伸縮節。由(you)構成其工(gong)作(zuo)主體的(de)波(bo)(bo)紋管(guan)(guan)(guan)（一種(zhong)彈性(xing)元件(jian)(jian)）和端管(guan)(guan)(guan)、支(zhi)架、法蘭(lan)、導管(guan)(guan)(guan)等附件(jian)(jian)組成。 屬于(yu)(yu)一種(zhong)補(bu)(bu)(bu)償(chang)元件(jian)(jian)。利用(yong)其工(gong)作(zuo)主體波(bo)(bo)紋管(guan)(guan)(guan)的(de)有效伸縮變(bian)形，以吸收管(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)、容器等由(you)熱(re)脹冷(leng)縮等原因而產(chan)生的(de)尺寸變(bian)化(hua)，或補(bu)(bu)(bu)償(chang)管(guan)(guan)(guan)線(xian)、導管(guan)(guan)(guan)、容器等的(de)軸向(xiang)、橫(heng)向(xiang)和角向(xiang)位移(yi)。也可(ke)用(yong)于(yu)(yu)降噪減振(zhen)。在現代工(gong)業中(zhong)用(yong)途廣(guang)泛。供熱(re)上(shang)，為了防止供熱(re)管(guan)(guan)(guan)道升溫(wen)時，由(you)于(yu)(yu)熱(re)伸長(chang)或溫(wen)度應力而引起管(guan)(guan)(guan)道變(bian)形或破壞，需要在管(guan)(guan)(guan)道上(shang)設置補(bu)(bu)(bu)償(chang)器，以補(bu)(bu)(bu)償(chang)管(guan)(guan)(guan)道的(de)熱(re)伸長(chang)，從而減小管(guan)(guan)(guan)壁的(de)應力和作(zuo)用(yong)在閥(fa)件(jian)(jian)或支(zhi)架結構上(shang)的(de)作(zuo)用(yong)力。