阀门标准 JIS B2005-6-2-2005 Industrial-process control valves-Part 6-2：Mounting details for attachment of positioners to control valves-Positioner mounting on rotary actuators.pdf [db:摘要]
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]
