BS EN 331:2015

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Manually operated ball valves and closed bottom taper plug valves for gas installations for buildings|Instructions for use, Size, Testing conditions, Damp-heat tests, Service pressure, Bend testing, Endurance testing, Classification systems, Gas supply, Cast-iron, Test equipment, Thermal testing, Installation, Environment (working), Dimensions, Joints, Energy supply systems (buildings), Packaging, Environmental testing, Torque, Manually-operated devices, Steels, Gas valves, Ball valves, Low-temperature testing, Seals, Domestic, Temperature, Thickness, Performance, Plug valves, Flow measurement, Marking, Leak tests, Valves, Ratings, Scratch tests, Torsion testing, Durability, Copper alloys, Flow rates

246 GBP