EN 331:2015

European foreword
1 Scope
2 Normative references
3 Terms, definitions, symbols, units and abbreviated terms
4 Product characteristics
5 Testing, assessment and sampling methods
6 Assessment and verification of constancy of performance -
  AVCP
7 Marking, labelling, instructions and packaging
Annex A (normative) - Resistance to high temperatures for
        valves classes B and C
Annex ZA (informative) - Clauses of this European Standard
         addressing the provisions of the EU Construction
         Products Regulation
Bibliography

1.1 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 × 105Pa, 5 × 105 Pa and 20 × 105Pa 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.1.2 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.