UNE-EN 1092-4:2002 Flanges and their joints. Circular flanges for pipes, valves, fittings and accesories, PN designated. Part 4: Aluminium alloy flanges.
2002UNE-EN 1092-4:2002 Flanges and their joints. Circular flanges for pipes, valves, fittings and accesories, PN designated. Part 4: Aluminium alloy flanges.