The butterfly valve closing procedure of water transfer work from Fengjiashan Reservoir to Baoji city is optimized for water hammer protection,and the concept of air valve set is proposed.

• 提出了空气阀组概念,水锤分析表明,采用空气阀组和两阶段关闭蝶阀联合作用可有效地防护长距离加压输水工程中水锤危害。