SIST EN 334:2019+A1:2025
(Main)Gas pressure regulators for inlet pressure up to 10 MPa (100 bar)
Gas pressure regulators for inlet pressure up to 10 MPa (100 bar)
This European Standard specifies 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 °C to +60 °C,
which operate with fuel gases of the 1st and 2nd family as defined in EN 437:2003+A1:2009, 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.
"Gas pressure regulators" hereafter will be called "regulators" except in the titles.
For standard regulators when used in pressure regulating stations complying with EN 12186 or EN 12279, the Annex ZA lists all applicable essential safety requirements of the European legislation on pressure equipment except external and internal corrosion resistance for applications in corrosive environment.
This document considers the following temperature classes/types of regulators:
- temperature class 1: operating temperature range from −10 °C to 60 °C;
- temperature class 2: operating temperature range from −20 °C to 60 °C;
- type IS: (integral strength type);
- type DS: (differential strength type).
This document applies to regulators which use the pipeline gas as a source of control energy unassisted by any external power source.
The regulator may incorporate a second regulator, used as monitor, complying with the requirements in this document.
The regulator may incorporate a safety shut off device (SSD) complying with the requirements of EN 14382.
The regulator may incorporate a creep (venting) relief device, complying with the requirements in Annex E and/or a vent limiter, complying with the requirements in Annex I.
This document does not apply to:
- regulators upstream from/on/in domestic gas-consuming appliances which are installed downstream of domestic gas meters;
- regulators designed to be incorporated into pressure control systems used in service lines ) with volumetric flow rate ≤ 200 m3/h at normal conditions and inlet pressure ≤ 5 bar;
- regulators for which a specific document exists (e.g. EN 88-1 and EN 88-2, etc.);
- industrial process control valves in accordance with EN 1349.
The normative Annex G of this document lists some suitable materials for pressure bearing parts, inner metallic partition walls, auxiliary devices, integral process and sensing lines, connectors and fasteners. Other materials may be used when complying with the restrictions given in Table 5.
Continued integrity of gas pressure regulators is ensured by suitable surveillance checks and maintenance. For periodic functional checks and maintenance it is common to refer to national regulations/standards where existing or users/manufacturers practices.
This document has introduced the reaction of the pressure regulators to the specified reasonable expected failures in terms of "fail close" and "fail open" pressure regulator types, but it should be considered that there are other types of failures whose consequences can bring to the same reactions (these risks are covered via redundancy as per EN 12186) and that residual hazards will be reduced by a suitable surveillance in use / maintenance.
In this document, both pressure regulators that can be classified as "safety accessories" by themselves (monitors) according to European legislation on pressure equipment as well as regulators that can be used to provide the necessary pressure protection through redundancy (e.g. pressure regulator with integrated safety shut-off device, pressure regulator + in-line monitor, pressure regulator + safety shut off device) are considered.
The provisions in this document are in line with the state of art at the moment of writing.
Gas-Druckregelgeräte für Eingangsdrücke bis 10 MPa (100 bar)
No scope available
Régulateurs de pression de gaz pour des pressions amont jusqu’à 10 MPa (100 bar)
Regulatorji tlaka plina za vstopne tlake do 10 MPa (100 bar) (vključno z dopolnilom A1)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-februar-2025
Nadomešča:
SIST EN 334:2019
Regulatorji tlaka plina za vstopne tlake do 10 MPa (100 bar) (vključno z dopolnilom
A1)
Gas pressure regulators for inlet pressure up to 10 MPa (100 bar)
Gas-Druckregelgeräte für Eingangsdrücke bis 10 MPa (100 bar)
Régulateurs de pression de gaz pour des pressions amont jusqu’à 10 MPa (100 bar)
Ta slovenski standard je istoveten z: EN 334:2019+A1:2024
ICS:
23.060.40 Tlačni regulatorji Pressure regulators
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 334:2019+A1
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2024
EUROPÄISCHE NORM
ICS 23.060.40 Supersedes EN 334:2019
English Version
Gas pressure regulators for inlet pressure up to 10 MPa
(100 bar)
Régulateurs de pression de gaz pour des pressions Gas-Druckregelgeräte für Eingangsdrücke bis 10 MPa
amont jusqu'à 10 MPa (100 bar) (100 bar)
This European Standard was approved by CEN on 23 April 2019 and includes Amendment 1 approved by CEN on 21 July 2024.
This European Standard was corrected and reissued by the CEN-CENELEC Management Centre on 20 November 2024.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATIO N
EUROPÄISCHES KOMITEE FÜR NORMUN G
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 334:2019+A1:2024 E
worldwide for CEN national Members.
Contents Page
European foreword . 7
1 Scope . 9
2 Normative references . 10
3 Terms and definitions . 13
3.1 General terms and definitions of types of gas pressure regulators . 13
3.2 Terms and definitions of components of gas pressure regulators. 16
3.3 Terms, symbols and definitions related to functional performance . 18
3.3.1 Terms, symbols and definitions related to pressure . 18
3.3.2 Terms, symbols and definitions related to flow . 19
3.3.3 Sound emission . 20
3.3.4 Variables in the controlling process . 21
3.3.5 Terms and definitions related to possible values of all variables . 21
3.3.6 Terms, symbols and definitions related to the controlled process . 21
3.3.7 Terms, symbols and definitions of functional performance . 22
3.3.8 Feature related to accuracy . 23
3.3.9 Terms, symbols and definitions related to lock-up behaviour . 25
3.4 Terms, symbols and definitions related to design and tests . 26
3.5 Summary of symbols, terms, subclauses and units. 29
4 Construction requirements . 31
4.1 Basic requirements . 31
4.1.1 General . 31
4.1.2 Gas pressure regulators with associated safety devices . 31
4.1.3 End connections . 33
4.1.4 Flange ratings . 34
4.1.5 Nominal sizes and face-to-face dimensions . 34
4.1.6 Sealing of the adjusting device . 37
4.1.7 Springs . 37
4.1.8 Parts transmitting actuating forces . 37
4.1.9 Replaceable parts that may be affected by erosion or abrasion . 37
4.2 Materials . 38
4.2.1 Requirements for metallic materials . 38
4.2.2 Requirements for elastomeric materials (vulcanized rubber materials) . 43
4.2.3 Requirements for non-metallic materials different from those in 4.2.2 . 44
4.3 Strength of housings and other parts. 44
4.3.1 Body . 44
4.3.2 Flanges . 44
4.3.3 Other pressure bearing parts . 44
4.3.4 Integral strength pressure regulators . 46
4.3.5 Differential strength pressure regulators . 46
4.3.6 Inner metallic partition walls . 46
4.3.7 Minimum values of safety factor for pressure bearing parts . 46
4.3.8 Welded joint coefficient . 46
4.3.9 Design requirements for strength of elastomeric parts . 47
5 Functional and characteristic requirements . 47
5.1 General . 47
5.1.1 Mounting position . 47
5.2 Shell strength, external tightness and internal sealing . 47
5.2.1 Shell strength . 47
5.2.2 External tightness . 48
5.2.3 Internal sealing . 48
5.3 Control classifications . 48
5.3.1 Accuracy under stable conditions . 48
5.3.2 Lock-up behaviour . 48
5.3.3 Stable conditions. 49
5.4 Final visual inspection . 49
5.4.1 Requirements for final visual inspection after type tests . 49
5.4.2 Requirements for final visual inspection after routine tests and production
surveillance . 49
5.5 Fail close conditions . 50
5.6 Fail open conditions . 50
5.7 Closing force for monitor at full open position . 50
5.8 Antistatic characteristics . 51
6 Gas pressure regulator sizing . 51
6.1 Flow behaviour . 51
6.2 Sizing equations for the calculation of volumetric flow rates of a gas pressure
regulator with its control member in its mechanically fully open position . 52
6.2.1 Normal calculations . 52
6.2.2 Practical calculations . 52
6.2.3 Simplified calculations . 52
6.3 Calculation of the maximum accuracy flow rate . 53
6.4 Inherent flow characteristics . 53
6.5 Calculation of volumetric flow rates for partially open gas pressure regulators . 53
6.6 Flow coefficient . 53
7 Testing . 54
7.1 General . 54
7.2 Tests . 54
7.3 Type test . 55
7.4 Selection of test samples . 55
7.5 Routine tests . 56
7.6 Production surveillance . 56
7.7 Test and
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