阀门标准 BS EN 13959-2004 Anti-pollution check valves – —N 6 to —N 250 inclusive Family E, type A, B, C, and —.pdf [db:摘要]
阀门标准 BS EN 12569-1999 工业阀门.化学和岩石化学工艺工业阀门.要求和试验Industrial valves – Valves for chemical and petrochemical process industry – Requirements and tests.pdf [db:摘要]
