阀门标准 BS EN 558-1-1996 Industrial valves — Face-to-face and centre-to-face dimensions of metal valves for use in flanged pipe systems.pdf [db:摘要]
阀门标准 JIS B2005-2-1-2005 Industrial-process control valves-Part 2-1：Flow capacity-Sizing equations for fluid flow under installed conditions.pdf [db:摘要]
