NEN EN 13774 : 2013

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviations
5 Requirements and testing
   5.1 Type testing
   5.2 Materials
   5.3 Design
   5.4 Dimensions
   5.5 Operability and endurance
   5.6 Strength of stops
   5.7 Resistance of the obturator to static differential
        pressure
   5.8 Bending resistance
   5.9 Shell strength
   5.10 External leak tightness
   5.11 Internal leak tightness
   5.12 Resistance to liquid agents
   5.13 Resistance to wear
   5.14 Reference flow rate
   5.15 Cleanness
   5.16 Storage
6 Marking
Annex A (normative) Analysis of the technical file and recording
        of the initial conditions
Annex B (normative) Test methods for valves
Annex C (informative) Additional characteristics on request from
        the purchaser
Annex D (informative) Resistance to bending moment applied via
        the stem or shaft
Annex E (informative) European standards for valves
Bibliography

Defines metal isolating valves used for gas distribution systems with maximum operating pressure up to 16 bar, and which operate with fuel gases of the first, the second and the third family, in accordance with EN 437.