This European Standard specifies the characteristics for the construction, performance and safety of ball valves and closed bottom taper plug valves. It also details the test methods and marking provisions. It applies to metallic valves not directly buried for domestic and commercial installations inside or outside of buildings, using gases of the first, second and third family (specified in EN 437) and working up to 0,2 × 105 Pa, 0,5 × 105 Pa, 1 × 105 Pa, 5 × 105 Pa and 20 × 105 Pa and with temperature limits from -5 °C or -20 °C to + 60 °C. NOTE "Not directly buried" within the context of this standard means that valves below ground are not in direct contact with earth or other materials e. g. that they are in a protected encasement. Valve nominal sizes (DN) covered by this European Standard are as follows: 6, 8, 10, 12, 15, 20, 25, 32, 40, 50, 65, 80, 100.
EN 331:2015 Referenced Document
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EN 1254-1:1998 Copper and Copper Alloys - Plumbing Fittings - Part 1: Fittings with Ends for Capillary Soldering or Capillary Brazing to Copper Tubes
EN 1254-2:1998 Copper and Copper Alloys - Plumbing Fittings - Part 2: Fittings with Compression Ends for Use with Copper Tubes
EN 377:1993 Lubricants for applications in appliances and associated controls using combustible gases except those designed for use in industrial processes
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EN 751-1:1996 Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water - Part 1: Anaerobic jointing compounds
EN 751-2:1996 Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water - Part 2: Non-hardening jointing compounds
EN 751-3:1996 Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water - Part 3: Unsintered PTFE tapes
EN 331:2015 history
2015EN 331:2015 Manually operated ball valves and closed bottom taper plug valves for gas installations for buildings
1998EN 331:1998 Manually operated ball valves and closed bottom taper plug valves for gas installations for buildings (Incorporates Amendment A1: 2010)