EN 331:2015 pdf download.MANUALLY OPERATED BALL VALVES AND CLOSED BOTTOM TAPER PLUG VALVES FOR GAS INSTALLATIONS FOR BUILDINGS.
EN 331 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.
EN 331 applies to metallic valves not directly buried for domestic and commercial installations inside or outside of buildings.
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.
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3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
standard reference conditions
conditions to which all measured values are corrected (temperature 15 °C; pressure 1013,25 x 102 Pa absolute; dry air)
3.2
shut off valve
device which admits or closes the gas flow by movement of the closure member. A valve is manually operated if operation can be performed by the user
3.3
components
3.3.1
obturator
movable part of the valve which shuts off the gas flow.EN 331 pdf download free.