Fixed firefighting systems. Components for gas extinguishing systems - Requirements and test methods for check valves and non-return valvesThis European Standard specifies the requirements and describes test methods for check and non return valves for CO2, inert gas or halocarbon gas fire extinguishing systems. Non return and check valves allow the passage in the direction of flow and they prevent flow in the reverse direction. This European Standard is applicable to check valves installed between container valve and manifold and non return valves installed in pilot lines, except those

BS 7666-1:2019 supersedes BS 76661:2006

DD CEN ISO/TS 19139:2009 Geographic information

5 Calculation method for capacitance

chemical and environmental properties of reflecting metal coatings

— include the rules for reporting predetermined

and their use will result in a reliable and positive experience for users

3 Treatment of long records in which rail-head defects are present

As a user of ISO 6413

without cavities or with unventilated cavities

The second is more compact

This British Standard does not provide guidance:

BS 8411:2007 provides essential guidance and recommendations on the safe use