KS B ISO 23551-1-2015(2020) Safety and control devices for gas burners and gas-burning appliances — Particular requirements — Part 1: Automatic and semi-automatic valves
2015KS B ISO 23551-1:2015 Safety and control devices for gas burners and gas-burning appliances — Particular requirements — Part 1: Automatic and semi-automatic valves
2009KS B ISO 23551-1:2009 Safety and control devices for gas burners and gas-burning appliances-Particular requirements-Part 1:Automatic valves