BS EN 12094-13. Fixed firefighting systems. Components for gas extinguishing systems. Part 13. Requirements and test methods for check valves and non-return valves|Check valves, Halogenated hydrocarbons, Gas valves, Components, Fire extinguishers, Fixed, Mechanical testing, Valves, Carbon dioxide, Gases, Design, Approval testing, Group 0 elements, Fire extinguishers (built-in), Firefighting equipment, Fire safety in buildings, Halogenated hydrocarbons, Check valves, Fire safety in buildings, Approval testing, Firefighting equipment, Fire extinguishers (built-in), Fire extinguishers, Group 0 elements, Gases, Valves, Gas valves, Fixed, Mechanical testing, Carbon dioxide, Components, Design