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