EN 558:2008 工业用阀.法兰管系统使用金属阀的面对面和中心对面的尺寸.PN和分类设计阀[代替:CEN EN 558-1,CEN EN 558-2]
Industrial valves - Face-to-face and centre-to-face dimensions of metal valves for use in flanged pipe systems - PN and Class designated valves (Incorporating corrigendum September 2010)