PREN 334 : DRAFT 2016

European foreword
1 Scope
2 Normative references
3 Terms, definitions and symbols
4 Construction requirements
5 Functional and characteristic requirements
6 Gas pressure regulator sizing
7 Testing
8 Field surveillance
9 Documentation
10 Marking
11 Packaging of finished product
Annex A (informative) - Alternative methods for the
        determination of the accuracy class, the lock-up
        pressure class, the maximum accuracy flow rate,
        the flow coefficients and the verification of the
        hysteresis band
Annex B (informative) - Inspection certificate
Annex C (informative) - Acceptance test
Annex D (informative) - Compliance evaluation
Annex E (normative) - Creep (venting) relief device
Annex F (informative) - Order specification
Annex G (normative) - Materials
Annex H (informative) - Dynamic force calculation method
Annex I (normative) - Vent limiter
Annex J (normative) - Elastomeric material
Annex K (informative) - Glossary and sub-clauses
Annex L (informative) - Environmental Provisions
Annex ZA (informative) - Relationship between this
         European Standard and the Essential Requirements
         of EU Directive 2014/68/EU
Bibliography

Defines constructional, functional, testing, marking, sizing and documentation requirements of gas pressure regulators: - for inlet pressures up to 100 bar and nominal diameters up to DN 400; - for an operating temperature range from -20 degrees C to +60 degrees C; which operate with fuel gases of the 1st and 2nd family as defined in EN 437, used in the pressure regulating stations in accordance with EN 12186 or EN 12279, in transmission and distribution networks and also in commercial and industrial installations.