SIST EN 1555-4:2021
(Main)Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 4: Valves
Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 4: Valves
This European Standard specifies the characteristics of valves made from polyethylene (PE) for piping systems in the field of the supply of gaseous fuels.
NOTE 1 Valves made from other material than polyethylene designed for the supply of gaseous fuels conforming to the relevant standards are permitted to be used in PE piping system according to EN 1555 provided they have relevant PE connection for butt fusion or electrofusion ends (see EN 1555 3).
It also specifies the test parameters for the test methods referred to in this standard.
In conjunction with Parts 1, 2, 3 and 5 of EN 1555, it is applicable to PE valves, their joints and to joints with components of PE and other materials intended to be used under the following conditions:
a) a maximum operating pressure, MOP, up to and including 10 bar );
b) an operating temperature of 20 °C as reference temperature;
NOTE 2 For other operating temperatures, derating coefficients should be used, see EN 1555 5.
c) an operating temperature between -20 °C and +40 °C.
EN 1555 covers a range of maximum operating pressures and gives requirements concerning colours and additives.
NOTE 3 It is the responsibility of the purchaser or specifier to make the appropriate selections from these aspects, taking into account their particular requirements and any relevant national regulations and installation practices or codes.
It is applicable to bi-directional valves with spigot end or electrofusion socket intended to be fused with PE pipes conforming to EN 1555 2 without any fittings or with PE fittings conforming to EN 1555 3.
This European Standard covers valves for pipes with a nominal outside diameter dn 315 mm.
Kunststoff-Rohrleitungssysteme für die Gasversorgung - Polyethylen (PE) - Teil 4: Armaturen
Dieses Dokument legt die Eigenschaften von Armaturen aus Polyethylen (PE) für Rohrleitungssysteme im Bereich der Versorgung mit gasförmigen Brennstoffen fest.
Es gilt für Armaturen mit einer und mit zwei Durchflussrichtungen, die über ein Schweißende oder eine Heizwendel Schweißmuffe verfügen, und dafür vorgesehen sind, mit Rohren oder Formstücken aus PE nach EN 1555 2 bzw. EN 1555 3 verschweißt zu werden.
Es ist vorgesehen, dass die Schweißenden oder Heizwendel Schweißmuffen aus PE für Armaturen, die aus einem anderen Werkstoff als Polyethylen gefertigt sind, EN 1555 3 entsprechen.
Das Dokument legt auch die Prüfparameter für die Prüfverfahren fest, auf die in diesem Dokument verwiesen wird.
In Verbindung mit Teil 1, Teil 2, Teil 3 und Teil 5 von EN 1555 gilt es für Armaturen aus PE, deren Verbindungen untereinander sowie mit Rohrleitungsteilen aus PE und anderen Werkstoffen, die für die Verwendung unter den folgenden Bedingungen vorgesehen sind:
a) der maximal zulässige Betriebsdruck MOP (en: maximum operating pressure) beträgt höchstens 10 bar ;
Für die Anwendung dieses Dokumentes und der Verweisungen auf EN 28233 wird MOP als Nenndruck angesehen.
b) es gilt eine Betriebstemperatur von 20 °C als Bezugstemperatur;
ANMERKUNG 1 Für andere Betriebstemperaturen können Minderungsfaktoren verwendet werden, siehe EN 1555 5.
c) eine Betriebstemperatur zwischen −20 °C und +40 °C.
EN 1555 (alle Teile) deckt einen Bereich von maximal zulässigen Betriebsdrücken ab und legt Anforderungen bezüglich Farben und Zusatzstoffen fest.
ANMERKUNG 2 Es liegt in der Verantwortung des Auftraggebers oder Planers, aus diesen Gesichtspunkten die geeignete Auswahl zu treffen, unter Berücksichtigung ihrer speziellen Anforderungen und jeglicher maßgebender nationaler Festlegungen und Verfahrensweisen oder Vorschriften für die Verlegung.
Dieses Dokument behandelt Armaturenkörper, die für die Verbindung mit Rohren mit einem Nennaußendurchmesser dn ≤ 400 mm ausgelegt sind.
Systèmes de canalisations en plastique pour la distribution de combustibles gazeux — Polyéthylène (PE) — Partie 4 : Robinets
Le présent document spécifie les caractéristiques des robinets en polyéthylène (PE) pour les systèmes de canalisations destinés à la distribution de combustibles gazeux.
ll s’applique aux robinets unidirectionnels et aux robinets bidirectionnels avec des extrémités à bout mâle ou des emboîtures électrosoudables prévues pour être soudées à des tubes ou à des raccords en PE conformes à l’EN 1555 2 et à l’EN 1555 3 respectivement.
Le bout mâle en PE ou les extrémités électrosoudables pour les robinets fabriqués à partir d’autres matières que le polyéthylène doivent être conformes à l’EN 1555 3.
Il spécifie également les paramètres d’essai pour les méthodes d’essai référencées dans ce document.
Conjointement avec les Parties 1, 2, 3 et 5 de l’EN 1555, il s’applique aux robinets en PE et à leurs assemblages, ainsi qu’aux assemblages avec des composants en PE et en d’autres matières destinés à être utilisés dans les conditions suivantes :
a) une pression maximale de service, MOP, jusqu’à et y compris 10 bar ;
Pour les besoins du présent document et en référence à l’EN 28233, la MOP est considérée comme la pression nominale.
b) une température de service de 20 °C comme température de référence ;
NOTE 1 Pour d’autres températures de service, des facteurs de réduction peuvent être utilisés ; voir l’EN 1555 5.
c) une température de service comprise entre -20 °C et +40 °C.
L’EN 1555 (toutes les parties) couvre une gamme de pressions maximales de service et donne les exigences concernant les couleurs et les additifs.
NOTE 2 Il est de la responsabilité de l’acheteur ou du prescripteur d’effectuer les choix appropriés à partir de ces données, en tenant compte des exigences particulières et de toute réglementation nationale applicable ainsi que des pratiques ou codes de pose.
Le présent document couvre les corps de robinets conçus pour être raccordés à des tubes d’un diamètre extérieur nominal dn ≤ 400 mm.
Cevni sistemi iz polimernih materialov za oskrbo s plinastimi gorivi - Polietilen (PE) - 4. del: Ventili
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 1555-4:2021
01-september-2021
Nadomešča:
SIST EN 1555-4:2011
Cevni sistemi iz polimernih materialov za oskrbo s plinastimi gorivi - Polietilen
(PE) - 4. del: Ventili
Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 4:
Valves
Kunststoff-Rohrleitungssysteme für die Gasversorgung - Polyethylen (PE) - Teil 4:
Armaturen
Systèmes de canalisations en plastique pour la distribution de combustibles gazeux —
Polyéthylène (PE) — Partie 4 : Robinets
Ta slovenski standard je istoveten z: EN 1555-4:2021
ICS:
83.140.30 Polimerne cevi in fitingi za Plastics pipes and fittings for
snovi, ki niso tekočine non fluid use
91.140.40 Sistemi za oskrbo s plinom Gas supply systems
SIST EN 1555-4:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 1555-4:2021
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SIST EN 1555-4:2021
EN 1555-4
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2021
EUROPÄISCHE NORM
ICS 23.060.99 Supersedes EN 1555-4:2011
English Version
Plastics piping systems for the supply of gaseous fuels -
Polyethylene (PE) - Part 4: Valves
Systèmes de canalisations en plastique pour la Kunststoff-Rohrleitungssysteme für die Gasversorgung
distribution de combustibles gazeux - Polyéthylène - Polyethylen (PE) - Teil 4: Armaturen
(PE) - Partie 4 : Robinets
This European Standard was approved by CEN on 7 June 2021.
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, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1555-4:2021 E
worldwide for CEN national Members.
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SIST EN 1555-4:2021
EN 1555-4:2021 (E)
Contents Page
European foreword . 4
Introduction . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 9
3.1 General . 9
3.2 Terms relating to design . 9
4 Symbols and abbreviations . 10
5 Material . 10
5.1 Compound for valve body . 10
5.2 Material for non-polyethylene parts . 10
5.2.1 General . 10
5.2.2 Metal parts . 11
5.2.3 Sealing materials . 11
5.2.4 Greases and lubricants. 11
5.2.5 Assembly . 11
6 General characteristics . 11
6.1 Appearance of the valve . 11
6.2 Colour . 11
6.3 Design . 11
6.3.1 General . 11
6.3.2 Valve body . 11
6.3.3 Valve ends . 11
6.3.4 Operating device . 12
6.3.5 Seals . 12
7 Geometrical characteristics . 12
7.1 General . 12
7.2 Measurement of dimensions. 12
7.3 Dimensions of spigot ends for valves . 12
7.4 Dimensions of valves with electrofusion sockets . 12
7.5 Dimensions of the operating device . 12
8 Mechanical characteristics of assembled valves . 13
8.1 General . 13
8.2 Requirements . 13
8.2.1 General . 13
8.2.2 Air flow rate . 19
9 Physical characteristics . 19
9.1 Conditioning . 19
9.2 Requirements . 19
10 Performance requirements . 20
11 Technical file . 20
12 Marking . 21
12.1 General . 21
12.2 Minimum required marking . 21
2
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12.3 Additional marking . 22
13 Delivery conditions . 22
Annex A (normative) Determination of the leaktightness of seat(s) and packing . 23
Annex B (normative) Test method for leaktightness and ease of operation after tensile loading 25
Bibliography. 27
3
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SIST EN 1555-4:2021
EN 1555-4:2021 (E)
European foreword
This document (EN 1555-4:2021) has been prepared by Technical Committee CEN/TC 155 “Plastics piping
systems and ducting systems”, the secretariat of which is held by NEN.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by January 2022, and conflicting national standards shall be withdrawn at
the latest by January 2022.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 1555-4:2011.
In comparison with the previous version, the following technical modifications have been introduced:
— PE 100-RC type materials with enhanced resistance to slow crack growth have been added.
— Annex A in EN 1555-1:2021 now discusses the performance of this type of material and gives additional
information for non-conventional installation techniques.
— The diameter range for valves has been increased to 400 mm.
— An improved description of the leaktightness test is given.
— Annex B has been added to describe the leaktightness test after the tensile test, following the withdrawal
of ISO 10933.
— Test methods have been updated.
— A new method has been added for PE 100-RC materials.
This document has been prepared in liaison with Technical Committee CEN/TC 234 “Gas infrastructure”.
System Standards are based on the results of the work undertaken in ISO/TC 138 “Plastics pipes, fittings and
valves for the transport of fluids”, which is a Technical Committee of the International Organization for
Standardization (ISO).
They are supported by separate standards on test methods to which references are made throughout the
System Standard.
The System Standards are consistent with general standards on functional requirements and on recommended
practice for installation.
EN 1555 consists of the following parts:
— EN 1555-1, Plastics piping systems for the supply of gaseous fuels ― Polyethylene (PE) ― Part 1: General;
— EN 1555-2, Plastics piping systems for the supply of gaseous fuels ― Polyethylene (PE) ― Part 2: Pipes;
— EN 1555-3, Plastics piping systems for the supply of gaseous fuels ― Polyethylene (PE) ― Part 3: Fittings;
— EN 1555-4, Plastics piping systems for the supply of gaseous fuels ― Polyethylene (PE) ― Part 4: Valves
(this standard);
— EN 1555-5, Plastics piping systems for the supply of gaseous fuels ― Polyethylene (PE) ― Part 5: Fitness for
purpose of the system;
— CEN/TS 1555-7, Plastics piping systems for the supply of gaseous fuels ― Polyethylene (PE) ― Part 7: Guidance
for the assessment of conformity.
4
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EN 1555-4:2021 (E)
NOTE EN 12007-2 [1] prepared by CEN/TC 234 “Gas infrastructure” deals with the recommended practice for
installation of plastics pipes system in accordance with EN 1555 (all parts).
Any feedback and questions on this document should be directed to the users’ national standards body. A
complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following
countries are bound to implement this European Standard: 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, Turkey and the United Kingdom.
5
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SIST EN 1555-4:2021
EN 1555-4:2021 (E)
Introduction
This document, specifies the requirements for a piping system and its components made from polyethylene
(PE) and which is intended to be used for the supply of gaseous fuels.
Requirements and test methods for material and components, other than valves, are specified in
EN 1555-1:2021, EN 1555-2:2021 and EN 1555-3:2021.
Characteristics for fitness for purpose are covered in EN 1555-5:2021. CEN/TS 1555-7 [2] gives guidance for
assessment of conformity. Recommended practice for installation is given in EN 12007-2:2012 [1] prepared by
CEN/TC 234.
This part of EN 1555 covers the characteristics of valves.
6
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EN 1555-4:2021 (E)
1 Scope
This document specifies the characteristics of valves made from polyethylene (PE) for piping systems in the
field of the supply of gaseous fuels.
It is applicable to isolating unidirectional and bi-directional valves with spigot ends or electrofusion sockets
intended to be fused with PE pipes or fittings conforming to EN 1555-2:2021 and EN 1555-3:2021 respectively.
Valves made from materials other than PE, designed for the supply of gaseous fuels conforming to the relevant
standards can be used in PE piping systems according to EN 1555 (all parts), provided that they have PE
connections for butt fusion or electrofusion ends, including integrated material transition joints, conforming to
EN 1555-3:2021.
It also specifies the test parameters for the test methods referred to in this document.
In conjunction with Parts 1, 2, 3 and 5 of EN 1555, it is applicable to PE valves, their joints and to joints with
components of PE and other materials intended to be used under the following conditions:
1
a) a maximum operating pressure, MOP, up to and including 10 bar at a reference temperature of 20 °C for
design purposes;
2
NOTE 1 For the purpose of this document and the references to EN ISO 8233 , MOP is considered to be nominal
pressure.
b) an operating temperature between −20 °C to 40 °C.
NOTE 2 For operating temperatures between 20 °C and 40 °C, derating coefficients are defined in EN 1555-5.
EN 1555 (all parts) covers a range of maximum operating pressures and gives requirements concerning
colours.
NOTE 3 It is the responsibility of the purchaser or specifier to make the appropriate selections from these aspects,
taking into account their particular requirements and any relevant national regulations and installation practices or codes.
This document covers valve bodies designed for connection with pipes with a nominal outside diameter
d ≤ 400 mm.
n
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references, the
latest edition of the referenced document (including any amendments) applies.
EN 682, Elastomeric Seals - Materials requirements for seals used in pipes and fittings carrying gas and
hydrocarbon fluids
EN 736-1:2018, Valves - Terminology - Part 1: Definition of types of valves
EN 736-2:2016, Valves - Terminology - Part 2: Definition of components of valves
EN 736-3:2008, Valves - Terminology - Part 3: Definition of terms
EN 1555-1:2021, Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 1: General
EN 1555-2:2021, Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 2: Pipes
1 5 2
1 bar = 0,1 MPa =10 Pa; 1 MPa = 1 N/mm .
7
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SIST EN 1555-4:2021
EN 1555-4:2021 (E)
EN 1555-3:2021, Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 3: Fittings
EN 1555-5:2021, Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 5: Fitness for
purpose of the system
EN 1680, Plastics piping systems - Valves for polyethylene (PE) piping systems - Test method for leaktightness
under and after bending applied to the operating mechanisms
EN 1704, Plastics piping systems - Thermoplastics valves - Test method for the integrity of a valve after
temperature cycling under bending
EN 1705, Plastics piping systems - Thermoplastics valves - Test method for the integrity of a valve after an external
blow
EN 12100, Plastics piping systems - Polyethylene (PE) valves - Test method for resistance to bending between
supports
EN 12119, Plastics piping systems - Polyethylene (PE) valves - Test method for resistance to thermal cycling
EN ISO 1133-1, Plastics - Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR) of
thermoplastics - Part 1: Standard method (ISO 1133-1)
EN ISO 1167-1:2006, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids - Determination of
the resistance to internal pressure - Part 1: General method (ISO 1167-1:2006)
EN ISO 1167-4, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids - Determination of the
resistance to internal pressure - Part 4: Preparation of assemblies (ISO 1167-4)
EN ISO 3127:2017, Thermoplastics pipes - Determination of resistance to external blows - Round-the-clock
method (ISO 3127:1994)
EN ISO 3126, Plastics piping systems - Plastics components - Determination of dimensions (ISO 3126)
2
EN ISO 8233 , Thermoplastic valves - Torque - Test method (ISO/FDIS 8233)
EN ISO 11357-6, Plastics - Differential scanning calorimetry (DSC) - Part 6: Determination of oxidation induction
time (isothermal OIT) and oxidation induction temperature (dynamic OIT) (ISO 11357-6)
EN ISO 17778, Plastics piping systems - Fittings, valves and ancillaries - Determination of gaseous flow
rate/pressure drop relationships (ISO 17778)
2
Under preparation. Stage at the time of publication: FprEN ISO 8233:2021.
8
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EN 1555-4:2021 (E)
3 Terms and definitions
For the purposes of this document, the terms and definitions, symbols and abbreviations given in
EN 1555-1:2021, EN 736-1:2018, EN 736-2:2016 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1 General
3.1.1
external leaktightness
leaktightness of the valve body enveloping the space containing the gas, with respect to the atmosphere
3.1.2
internal leaktightness
leaktightness between the inlet and the outlet of the valve, with the valve in the closed position
3.1.3
leakage
emission of gas from a valve body, or any component of a valve
3.1.4
valve body
main part of a valve which consists of an operating stop system and contains the obturator, seat(s), stem(s) or
shaft(s) and packing seals, and provides the terminal ends for connection to the PE pipe/fittings as applicable
3.1.5
operating device
part of a valve for connection with the operating key which allows the opening and the closing of the valve
3.2 Terms relating to design
3.2.1
isolating valve
valve intended for use only in the closed or fully open position
[SOURCE: EN 736-1:2018]
3.2.2
full bore valve
valve with a flow section equal to or greater than 80 % of the section corresponding to the nominal inside
diameter of the body end port
[SOURCE: EN 736-3:2008]
3.2.3
clearway valve
valve designed to have an unobstructed flow way, which allows for the passage of a theoretical sphere with a
diameter that is not less than the nominal inside diameter of the body end port
[SOURCE: EN 736-3:2008]
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EN 1555-4:2021 (E)
3.2.4
reduced bore valve
valve with a flow section equal to or greater than 36 % of the section corresponding to the nominal inside
diameter of the body end port and which does not correspond to the full bore valve
[SOURCE: EN 736-3:2008]
4 Symbols and abbreviations
For the purpose of this document the symbols and abbreviations given in EN 1555-1 apply.
5 Material
5.1 Compound for valve body
The PE compound from which the valve body with spigot or electrofusion socket is made shall conform to
EN 1555-1:2021.
The PE components of the valve shall be made only from virgin material conforming to EN 1555-1:2021.
5.2 Material for non-polyethylene parts
5.2.1 General
All components shall conform to the relevant EN standard(s). Alternative standards may be applied in cases
where the suitable EN standard(s) do not exist. In all cases, fitness for purpose of the components shall be
demonstrated.
The materials and the constituent elements used in making the valve (including elastomers, greases and any
metal parts as may be used) shall be as resistant to the external and internal environments as the other
elements of the piping system, and shall have an expected lifetime under the following conditions at least equal
to that of the PE pipes conforming to EN 1555-2:2021, with which they are intended to be used:
a) during storage;
b) under the effect of the gas conveyed therein;
c) with respect to the service environment and operating conditions.
The requirements for the level of material performance of non-polyethylene parts shall be at least as stringent
as that of the PE compound for the piping system. Reworked materials shall not be used for stress bearing
polymeric parts.
Other materials used in valves in contact with the PE pipe shall not adversely affect pipe performance or initiate
stress cracking.
The valve manufacturer shall ensure that any transition joint between polyethylene and non-polyethylene parts
and the valve body fulfil the requirements of EN 1555-3:2021.
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EN 1555-4:2021 (E)
5.2.2 Metal parts
All metal parts susceptible to corrosion shall be adequately protected, providing this is necessary for the
durability and function of the system.
When dissimilar metallic materials are used which may be in contact with moisture, steps shall be taken to
avoid the possibility of galvanic corrosion.
5.2.3 Sealing materials
Elastomeric seals shall conform to EN 682.
If other sealing materials are used they need to be proven for gas supply systems.
5.2.4 Greases and lubricants
Greases or lubricants shall not exude onto fusion areas, and shall not affect the long term performance of the
valve materials.
5.2.5 Assembly
Ancillary components of valves shall be assembled according to manufacturer’s procedures and any component
used in the assembly shall not prevent conformity of the valve to this document.
6 General characteristics
6.1 Appearance of the valve
When viewed without magnification, the internal and external surfaces of valves shall be smooth, clean and
shall have no scoring, cavities or other surface defects to an extent that would prevent conformity to this
document.
No component of the valve shall show any signs of damage, scratches, pitting, bubbles, blisters, inclusions or
cracks to an extent that would prevent conformity of the valves to the requirements of this document.
6.2 Colour
The colour of the PE parts of valves shall be either black, yellow or orange.
6.3 Design
6.3.1 General
The valve shall be designed to provide the fluid flow passageway and the body ends.
The pressure resistance of the valve shall be defined by the manufacturer according to the design SDR and
material classification.
6.3.2 Valve body
The valve body shall be such that it cannot be dismantled.
An operating stop system shall be provided at the fully open and closed positions.
6.3.3 Valve ends
PE spigot ends or electrofusion sockets shall comply with the requirements of EN 1555-3:2021.
11
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EN 1555-4:2021 (E)
6.3.4 Operating device
The operating device shall be integral with or connected to the stem in such a way that disconnection is
impossible without special equipment.
The valve shall close by turning the operating device clockwise. For a quarter-turn valve, the position of the
obturator shall be clearly indicated on the top side of the operating device.
It is recommended that the position of the obturator is marked on the access point for a quarter turn valve.
Stops shall be provided at the fully open and closed positions.
6.3.5 Seals
The seals shall be so mounted as to be resistant to normally occurring mechanical loads, see 5.2.3. Creep and
cold flow effects shall be taken into account. Any mechanism that puts a loading on the seals shall be
permanently locked. Line pressure shall not be used as the sole means of seal activation.
7 Geometrical characteristics
7.1 General
Each valve shall be characterized by its dimensions and associated end connections.
7.2 Measurement of dimensions
The dimensions of the valve shall be measured in accordance with EN ISO 3126, and rounded to the next
0,1 mm. In case of dispute, the measurement shall not be made less than 24 h after manufacture, and after being
conditioned for at least 4 h at (23 ± 2) °C.
Additionally, for spigot end valves provided with temporary supports, perform dimensional measurement at
least 1 h after removal of the supports.
Indirect measurement at the stage of production is allowed at shorter time periods providing evidence is shown
of correlation.
7.3 Dimensions of spigot ends for valves
The dimensions of spigot ends shall conform to EN 1555-3:2021, Table 3, up to and including d 400 mm.
n
7.4 Dimensions of valves with electrofusion sockets
The dimensions of electrofusion sockets shall conform to EN 1555-3:2021, Table 1, up to and including d
n
400 mm.
7.5 Dimensions of the operating device
For a quarter-turn valve, the dimension of the operating devices shall be designed so it can be operated with a
+0,5
(50 ) mm square socket, (40 ± 2) mm depth.
0
NOTE For a multi-turn operated valve, attention is drawn to the requirements specified in EN ISO 5210 [4].
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EN 1555-4:2021 (E)
8 Mechanical characteristics of assembled valves
8.1 General
All tests shall be carried out on valves assembled with pipe conforming to EN 1555-2:2021 from the same SDR
as the SDR of the valve spigots, in accordance with the technical instructions of the manufacturer and taking
into account the extreme conditions of utilization described in EN 1555-5:2021.
NOTE The properties of an assembled valve depend on the properties of the pipes and the valve and on the conditions
of th
...
SLOVENSKI STANDARD
oSIST prEN 1555-4:2019
01-december-2019
Cevni sistemi iz polimernih materialov za oskrbo s plinastimi gorivi - Polietilen
(PE) - 4. del: Ventili
Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 4:
Valves
Kunststoff-Rohrleitungssysteme für die Gasversorgung - Polyethylen (PE) - Teil 4:
Armaturen
Systèmes de canalisations en plastique pour la distribution de combus-tibles gazeux -
Polyéthylène (PE) - Partie 4 : Robinets
Ta slovenski standard je istoveten z: prEN 1555-4
ICS:
83.140.30 Polimerne cevi in fitingi za Plastics pipes and fittings for
snovi, ki niso tekočine non fluid use
91.140.40 Sistemi za oskrbo s plinom Gas supply systems
oSIST prEN 1555-4:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 1555-4:2019
DRAFT
EUROPEAN STANDARD
prEN 1555-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2019
ICS 23.060.99 Will supersede EN 1555-4:2011
English Version
Plastics piping systems for the supply of gaseous fuels -
Polyethylene (PE) - Part 4: Valves
Systèmes de canalisations en plastique pour la Kunststoff-Rohrleitungssysteme für die Gasversorgung
distribution de combustibles gazeux - Polyéthylène - Polyethylen (PE) - Teil 4: Armaturen
(PE) - Partie 4 : Robinets
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 155.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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, Turkey and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1555-4:2019 E
worldwide for CEN national Members.
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prEN 1555-4:2019 (E)
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions, symbols and abbreviations . 7
4 Material . 9
4.1 PE compound . 9
4.2 Material for non-polyethylene parts . 9
5 General characteristics . 9
5.1 Appearance of the valve . 9
5.2 Colour . 10
5.3 Design . 10
6 Geometrical characteristics . 10
6.1 General . 10
6.2 Measurement of dimensions. 11
6.3 Dimensions of spigot ends for valves . 11
6.4 Dimensions of valves with electrofusion sockets . 11
6.5 Dimensions of the operating device . 11
7 Mechanical characteristics of assembled valves . 11
7.1 General . 11
7.2 Requirements . 11
Table 1 — Mechanical characteristics . 12
Table 2 — Circumferential (hoop) stress at 80 °C and associated minimum test period . 16
Figure 1 — Position of the test piece for the impact loading test . 17
8 Physical characteristics . 17
8.1 Conditioning . 17
8.2 Requirements . 17
Table 3 — Physical characteristics . 18
9 Performance requirements . 18
10 Marking . 18
10.1 General . 18
10.2 Minimum required marking . 18
Table 4 — Minimum required marking . 19
10.3 Additional marking . 19
11 Delivery conditions . 19
Annex A (normative) Determination of the leaktightness of seat(s) and packing . 20
A.1 General . 20
A.2 Test piece . 20
A.3 Procedure . 20
A.3.1 Conditioning . 20
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A.3.2 Internal Leaktightness test (fully closed valve test) . 20
A.3.3 External Leaktightness test (half open valve) . 20
A.4 Test report . 21
Annex B (normative) Test method for leaktightness and ease of operation after tensile loading 22
B.1 Apparatus . 22
B.2 Test piece . 22
B.3 Conditions . 22
B.4 Procedure . 22
B.5 Test report . 23
Bibliography. 24
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prEN 1555-4:2019 (E)
European foreword
This document (prEN 1555-4:2019) has been prepared by Technical Committee CEN/TC 155 “Plastics piping
systems and ducting systems”, the secretariat of which is held by NEN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 1555-4:2011.
It has been prepared in liaison with Technical Committee CEN/TC 234 “Gas infrastructure”.
System Standards are based on the results of the work undertaken in ISO/TC 138 “Plastics pipes, fittings and
valves for the transport of fluids”, which is a Technical Committee of the International Organization for
Standardization (ISO).
They are supported by separate standards on test methods to which references are made throughout the
System Standard.
The System Standards are consistent with general standards on functional requirements and on recommended
practice for installation.
EN 1555 consists of the following parts:
— EN 1555-1, Plastics piping systems for the supply of gaseous fuels ― Polyethylene (PE) ― Part 1: General;
— EN 1555-2, Plastics piping systems for the supply of gaseous fuels ― Polyethylene (PE) ― Part 2: Pipes;
— EN 1555-3, Plastics piping systems for the supply of gaseous fuels ― Polyethylene (PE) ― Part 3: Fittings;
— EN 1555-4, Plastics piping systems for the supply of gaseous fuels ― Polyethylene (PE) ― Part 4: Valves (this
standard);
— EN 1555-5, Plastics piping systems for the supply of gaseous fuels ― Polyethylene (PE) ― Part 5: Fitness for
purpose of the system;
— CEN/TS 1555-7, Plastics piping systems for the supply of gaseous fuels ― Polyethylene (PE) ― Part 7: Guidance
for the assessment of conformity.
NOTE EN 12007-2:2012 [3] prepared by CEN/TC 234 “Gas infrastructure” deals with the recommended practice for
installation of plastics pipes system in accordance with EN 1555 (all parts).
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Introduction
This document, specifies the requirements for a piping system and its components made from polyethylene
(PE) and which is intended to be used for the supply of gaseous fuels.
Requirements and test methods for material and components, other than valves, are specified in
prEN 1555-1:2019, prEN 1555-2:2019 and prEN 1555-3:2019.
Characteristics for fitness for purpose are covered in prEN 1555-5:2019. CEN/TS 1555-7:2019 [2] gives
guidance for assessment of conformity. Recommended practice for installation is given in EN 12007-2:2012 [3]
prepared by CEN/TC 234.
This part of EN 1555 covers the characteristics of valves.
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1 Scope
This document specifies the characteristics of valves made from polyethylene (PE) for piping systems in the
field of the supply of gaseous fuels.
It is applicable to unidirectional and bi-directional valves with spigot end or electrofusion socket intended to
be fused with PE pipes or fittings conforming to EN 1555-2 and EN 1555-3 respectively.
The PE spigot or electrofusion ends for valves made of material other than polyethylene is intended to be in
accordance with EN 1555-3.
It also specifies the test parameters for the test methods referred to in this document.
In conjunction with Parts 1, 2, 3 and 5 of EN 1555, it is applicable to PE valves, their joints and to joints with
components of PE and other materials intended to be used under the following conditions:
2
1
a) a maximum operating pressure, MOP, up to and including 10 bar ;
For the purpose of this document and the references to EN 28233, MOP is considered to be nominal
pressure.
b) an operating temperature of 20 °C as reference temperature;
NOTE 1 For other operating temperatures, derating coefficients can be used, see EN 1555-5.
c) an operating temperature between −20 °C and +40 °C.
EN 1555 (all parts) covers a range of maximum operating pressures and gives requirements concerning colours
and additives.
NOTE 2 It is the responsibility of the purchaser or specifier to make the appropriate selections from these aspects,
taking into account their particular requirements and any relevant national regulations and installation practices or codes.
This document covers valve bodies designed for connection with pipes with a nominal outside diameter
dn ≤ 400 mm.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references, the
latest edition of the referenced document (including any amendments) applies.
EN 682, Elastomeric Seals — Materials requirements for seals used in pipes and fittings carrying gas and
hydrocarbon fluids
EN 736-1:2018, Valves — Terminology — Part 1: Definition of types of valves
EN 736-2:2016, Valves — Terminology — Part 2: Definition of components of valves
prEN 1555-1:2019, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 1: General
prEN 1555-2:2019, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 2: Pipes
prEN 1555-3:2019, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 3: Fittings
1
1 bar = 0,1 MPa.
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prEN 1555-5:2019, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 5: Fitness
for purpose of the system
EN 1680, Plastics piping systems — Valves for polyethylene (PE) piping systems — Test method for leaktightness
under and after bending applied to the operating mechanisms
EN 1704, Plastics piping systems — Thermoplastics valves — Test method for the integrity of a valve after
temperature cycling under bending
EN 1705, Plastics piping systems — Thermoplastics valves — Test method for the integrity of a valve after an
external blow
EN 12100, Plastics piping systems — Polyethylene (PE) valves — Test method for resistance to bending between
supports
EN 12119, Plastics piping systems — Polyethylene (PE) valves — Test method for resistance to thermal cycling
EN 28233, Thermoplastic valves — Torque — Test method (ISO 8233)
EN ISO 1133-1, Plastics — Determination of the melt mass-flow rate (MFR) and the melt volume-flow rate (MVR)
of thermoplastics — Part 1: Standard method (ISO 1133-1)
EN ISO 1167-1, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of the
resistance to internal pressure — Part 1: General method (ISO 1167-1)
EN ISO 1167-4, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of the
resistance to internal pressure — Part 4: Preparation of assemblies (ISO 1167-4)
EN ISO 3127:2017, Thermoplastics pipes — Determination of resistance to external blows — Round-the-clock
method (ISO 3127:1994)
EN ISO 3126, Plastics piping systems — Plastics components — Determination of dimensions (ISO 3126)
EN ISO 11357-6, Plastics — Differential scanning calorimetry (DSC) — Part 6: Determination of oxidation
induction time (isothermal OIT) and oxidation induction temperature (dynamic OIT) (ISO 11357-6)
EN ISO 17778, Plastics piping systems — Fittings, valves and ancillaries — Determination of gaseous flow
rate/pressure drop relationships (ISO 17778)
3 Terms and definitions, symbols and abbreviations
For the purposes of this document, the terms and definitions, symbols and abbreviations given in
prEN 1555-1:2019, EN 736-1:2018, EN 736-2:2016 and the following apply.
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1 General
3.1.1
external leaktightness
leaktightness of the valve body enveloping the space containing the gas, with respect to the atmosphere
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3.1.2
internal leaktightness
leaktightness between the inlet and the outlet of the valve, with the valve in the closed position
3.1.3
leaktightness test
test for both of the following characteristics:
a) the internal leaktightness of a valve's closing seat when closed and pressurized from either side;
b) the external leaktightness of a valve when half open
3.1.4
initiating torque
torque required to initiate movement of the obturator
3.1.5
running torque
torque required to achieve full opening or closing of the valve at maximum allowable operating pressure
3.1.6
leakage
emission of gas from a valve body, or any component of a valve
3.1.7
valve body
main part of a valve which consists of an operating stop system and contains the obturator, seat(s), stem(s) or
shaft(s) and packing seals and provides the terminal ends for connection to the PE pipe/fittings as applicable
3.1.8
operating device
part of a valve for connection with the operating key which allows the opening and the closing of the valve
3.2 Terms relating to design
3.2.1
full bore valve
valve with a flow section equal to or greater than 80% of the section corresponding to the nominal inside
diameter of the body end port
[SOURCE: EN 736-3:2008]
3.2.2
clearway valve
valve designed to have an unobstructed flow way, which allows for the passage of a theoretical sphere with a
diameter that is not less than the nominal inside diameter of the body end port
[SOURCE: EN 736-3:2008]
3.2.3
reduced bore valve
valve with a flow section equal to or greater than 36% of the section corresponding to the nominal inside
diameter of the body end port and which does not correspond to the full bore valve
[SOURCE: EN 736-3:2008]
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4 Material
4.1 PE compound
The PE compound from which the valve body with spigot or electrofusion socket is made shall conform to
prEN 1555-1:2019. The PE components of the valve shall be made only from virgin material conforming to
prEN 1555-1:2019.
4.2 Material for non-polyethylene parts
4.2.1 General
The materials and the constituent elements used in making the valve (including elastomers, greases and any
metal parts as may be used) shall be as resistant to the external and internal environments as the other
elements of the piping system and shall have a life expectancy at least equal to that of the PE pipes conforming
to prEN 1555-2:2019, with which they are intended to be used, under the following conditions:
a) during storage;
b) under the effect of the gas conveyed therein;
c) with respect to the service environment and operating conditions.
The requirements for the level of material performance of non-polyethylene parts shall be at least as stringent
as that of the PE compound for the piping system.
Reprocessed materials shall not be used for stress bearing polymeric parts.
Other materials used in valves in contact with the PE pipe shall not adversely affect pipe performance or initiate
stress cracking.
4.2.2 Metal parts
All metal parts susceptible to corrosion shall be adequately protected, providing this is necessary for the
durability and function of the system.
When dissimilar metallic materials are used which may be in contact with moisture, steps shall be taken to
avoid the possibility of galvanic corrosion.
4.2.3 Elastomers
Elastomeric seals shall conform to EN 682.
Other sealing materials are permitted if proven suitable for gas service.
4.2.4 Greases and lubricants
Greases or lubricants shall not affect the long term performance of the PE valve or valve body and shall not
exude onto fusion areas.
5 General characteristics
5.1 Appearance of the valve
When viewed without magnification, the internal and external surfaces of valves shall be smooth, clean and free
from scoring, cavities or other surface defects to an extent that would prevent conformity to this document.
No component of the valve shall show any signs of damage, scratches, pitting, bubbles, blisters, inclusions or
cracks to an extent that would prevent conformity of the valves to this document.
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5.2 Colour
The colour of the PE parts of valves shall be either black, yellow or orange.
5.3 Design
5.3.1 General
The design of the valve shall be such that, when assembling the valve onto the pipe or other components, the
electrical coils and/or seals or any other ancillary parts are not displaced.
The valve shall be designed to provide the fluid flow passageway and the body ends.
The characteristic of the fluid flow shall be such that the manufacturer will declare the valve as:
a) full bore;
b) clearway;
c) reduced bore.
NOTE See definitions 3.2.1, 3.2.2 and 3.2.3.
5.3.2 Valve body
PE valves bodies and their PE spigot end or electrofusion socket shall have an MOP of at least that of the pipe
to which they are assembled. PE spigot ends or electrofusion sockets shall comply with the requirements as
reported in prEN 1555-3:2019.
The valve body shall be such that it cannot be dismantled.
An operating stop system shall be provided at the fully open and closed positions.
5.3.3 Operating device
The operating device shall be integral with or connected to the stem in such a way that disconnection is
impossible without special equipment.
The valve shall close by turning the operating device clockwise. For a quarter-turn valve, the condition of the
obturator shall be clearly indicated on the top side of the operating device.
Stops shall be provided at the fully open and closed positions.
5.3.4 Seals
The seals shall be so mounted as to be resistant to normally occurring mechanical loads. Creep and cold flow
effects shall be taken into account. Any mechanism that puts a loading on the seals shall be permanently locked.
Line pressure shall not be used as the sole means of seal activation.
6 Geometrical characteristics
6.1 General
Each valve shall be characterized by its dimensions and associated end connections.
Technical data given by the manufacturer shall include at least the following information:
a) the dimensional characteristics, by working drawings;
b) the assembly instructions.
NOTE In order to prevent stress concentrations, any changes in the wall thickness of the valve body is expected to be
gradual.
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6.2 Measurement of dimensions
Dimensions shall be measured in accordance with EN ISO 3126 at (23 ± 2) °C, after being conditioned for at
least 4 h. The measurement shall not be made less than 24 h after manufacture.
NOTE Indirect measurement at the stage of production is allowed at shorter time periods providing evidence is shown
of correlation.
6.3 Dimensions of spigot ends for valves
The dimensions of spigot ends shall conform to prEN 1555-3:2019, Table 3, up to and including d 400 mm.
n
6.4 Dimensions of valves with electrofusion sockets
The dimensions of electrofusion sockets shall conform to prEN 1555-3:2019, Table 1, up to and including d
n
400 mm.
6.5 Dimensions of the operating device
For a quarter-turn valve, the dimension of the operating devices shall be designed so it can be operated with a
+0,5
0
(50 ) mm square socket, (40 ± 2) mm depth.
NOTE For a multi-turn operated valve, the attention is drawn to the requirements specified in EN ISO 5210 [4].
7 Mechanical characteristics of assembled valves
7.1 General
All tests shall be carried out on valve assembled with pipe pieces from the same SDR conforming to
prEN 1555-2:2019, in accordance with the technical instructions of the manufacturer and taking into account
the extreme conditions of utilization described in prEN 1555-5:2019.
NOTE The properties of an assembled valve depend on the properties of the pipes and the valve and on the conditions
of their installation (i.e. geometry, temperature, type, method of conditioning, assembly and fusion procedures).
The technical file of the manufacturer shall include at least the following information:
a) service conditions (e.g. valve temperature limits);
b) assembly instructions;
c) for valves with electrofusion sockets, the fusion instructions (power requirements or fusion parameters
with limits);
d) Air flow rate value.
7.2 Requirements
7.2.1 General
When tested in accordance with the test methods as specified in Table 1 using the indicated parameters, the
valves shall have mechanical characteristics conforming to the requirements given in Table 1.
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Table 1 — Mechanical characteristics
Test parameters
Characteristic Requirements Test method
Parameter Value
Hydrostatic No failure a Shall conform to EN ISO 1167-1
Conditioning time
strength during the test EN ISO 1167-1 and
b
Number of test pieces
g period of any 3 EN ISO 1167-4
(20 °C, 100 h)
Type of test
test piece Water-in-water
Circumferential (hoop)
10,0 MPa
i
stress : PE 80
12,0 MPa
PE 100
12,0 MPa
PE 100-RC
100 h
Test period
20 °C
Test temperature
Hydrostatic No failure a Shall conform to EN ISO 1167-1
Conditioning time
strength during the test EN ISO 1167-1 and
b
Number of test pieces
g period of any 3 EN ISO 1167-4
(80 °C, 165 h)
Type of test
c Water-in-water
test piece
Circumferential (hoop)
i
stress : PE 80
4,5 MPa
PE 100
5,4 MPa
PE 100-RC
5,4 MPa
Test period
165 h
Test temperature
80 °C
Hydrostatic No failure a Shall conform to EN ISO 1167-1
Conditioning time
strength during the test EN ISO 1167-1 and
b
Number of test pieces
g period of any 3 EN ISO 1167-4
(80 °C, 1 000 h)
Type of test
test piece Water-in-water
Circumferential (hoop)
i
stress : PE 80
4,0 MPa
PE 100
5,0 MPa
PE 100-RC
5,0 MPa
Test period
1 000 h
Test temperature
80 °C
Leaktightness of No leakage Test temperature 23 °C Annex A
seat(s) and during the test Type fluid Air or nitrogen
packing period b 1
Number of test pieces
25 mbar
Test pressure
1 h
Duration of the test
Leaktightness of No leakage Test temperature f Annex
...
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