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BS EN 558. Industrial valves. Face-to-face and centre-to-face dimensions of metal valves for use in flanged pipe systems. PN and Class designated valves|Valves, Dimensions, Gate valves, Flanges, Dimensional tolerances, Designations, Fluid equipment, Ball valves, Metals, Plug valves, Butterfly valves, Flanged fittings, Screw-down valves, Diaphragm valves, Check valves

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