阀门标准 BS 7461-1991 Specification for electrically operated automatic gas shut-off valves fitted with throughput adjusters, proof of closure switches.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]
