補償(chang)器(qi)習慣上(shang)(shang)(shang)也叫膨(peng)脹節(jie)，或伸縮節(jie)。由構(gou)(gou)成其工(gong)(gong)作(zuo)(zuo)主體的(de)(de)波紋(wen)管(guan)(guan)(guan)(guan)（一種(zhong)彈(dan)性(xing)元件(jian)(jian)）和(he)端管(guan)(guan)(guan)(guan)、支(zhi)架、法蘭、導(dao)(dao)管(guan)(guan)(guan)(guan)等(deng)附件(jian)(jian)組成。 屬于(yu)一種(zhong)補償(chang)元件(jian)(jian)。利用(yong)(yong)其工(gong)(gong)作(zuo)(zuo)主體波紋(wen)管(guan)(guan)(guan)(guan)的(de)(de)有效(xiao)伸縮變形，以吸收管(guan)(guan)(guan)(guan)線、導(dao)(dao)管(guan)(guan)(guan)(guan)、容(rong)器(qi)等(deng)由熱(re)脹冷縮等(deng)原因而(er)產生的(de)(de)尺寸變化，或補償(chang)管(guan)(guan)(guan)(guan)線、導(dao)(dao)管(guan)(guan)(guan)(guan)、容(rong)器(qi)等(deng)的(de)(de)軸向、橫向和(he)角向位移。也可用(yong)(yong)于(yu)降噪減(jian)振(zhen)。在現代工(gong)(gong)業中用(yong)(yong)途廣泛。供(gong)熱(re)上(shang)(shang)(shang)，為(wei)了(le)防止供(gong)熱(re)管(guan)(guan)(guan)(guan)道升(sheng)溫(wen)時，由于(yu)熱(re)伸長或溫(wen)度應力(li)而(er)引起管(guan)(guan)(guan)(guan)道變形或破壞，需要(yao)在管(guan)(guan)(guan)(guan)道上(shang)(shang)(shang)設(she)置補償(chang)器(qi)，以補償(chang)管(guan)(guan)(guan)(guan)道的(de)(de)熱(re)伸長，從而(er)減(jian)小管(guan)(guan)(guan)(guan)壁(bi)的(de)(de)應力(li)和(he)作(zuo)(zuo)用(yong)(yong)在閥件(jian)(jian)或支(zhi)架結構(gou)(gou)上(shang)(shang)(shang)的(de)(de)作(zuo)(zuo)用(yong)(yong)力(li)。