EN 558:2008 工業用閥.法蘭管系統使用金屬閥的面對面和中心對面的尺寸.PN和分類設計閥[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)