阀门标准 BS 1868-1975(R1990) Steel check valves(flanged and butt-welding ends) for the petroleum,petrochemical and allied industries.pdf [db:摘要]
阀门标准 BS EN 12516-4-2008 Industrial valves — Shell design strength — Part 4 Calculation method for valve shells manufactured in metallic materials other than steel.pdf [db:摘要]
