要求 ? 1.OS&Y Gate valves sizes 2 ½ inch to 8 inch for water fire fighting systems, UL listed & FM approved – W.P. 175 PSI. ? 2 Non-return valves sizes 2 ½ inch to 6 inch UL&FM. W.P. 175 PSI. ? 3 Selection (Directional) valve for carbon dioxide fire fighting systems sizes 1 inch to 3 inch W.P. 50 bar. 联系 afei16ban@hotmail.com
