阀门标准 BS EN 558-2-1996 Industrial valves — Face-to-face and centre-to-face dimensions of metal.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]
