EN ISO 16486-4:2025
(Main)Plastics piping systems for the supply of gaseous fuels - Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing - Part 4: Valves (ISO 16486-4:2025)
Plastics piping systems for the supply of gaseous fuels - Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing - Part 4: Valves (ISO 16486-4:2025)
This document specifies the characteristics of valves made from unplasticized polyamide (PA-U) in accordance with ISO 16486-1, intended to be buried and used for the supply of gaseous fuels.
NOTE 1 For the purpose of this document the term gaseous fuels include for example natural gas, methane, butane, propane, hydrogen, manufactured gas, biogas, and mixtures of these gases. Additional information about the suitability for 100 % hydrogen and its admixtures with natural gas is given by ISO 16486-1:2023, Annex C and Annex D.
It is applicable to isolating unidirectional and bi-directional valves with spigot ends or electrofusion sockets intended to be fused with PA-U pipes conforming to ISO 16486-2 and PA-U fittings conforming to ISO 16486-3.
This document also specifies the test parameters for the test methods it describes.
In conjunction with ISO 16486-1, ISO 16486-2, ISO 16486-3 and ISO 16486-5, this document is applicable to PA-U valves and their joints and to joints with components of PA-U and other materials intended to be used under the following conditions:
a) a maximum operating pressure (MOP) of up to and including 18 bar1), or limited to 16 bar under regional CEN requirements, at a reference temperature of 20 °C for design purposes;
NOTE 2 For the purpose of this document and the references to ISO 8233, MOP is considered to be nominal pressure.
b) an operating temperature of −20 °C to 40 °C;
NOTE 3 For operating temperatures between 20 °C and 40 °C, derating coefficients are specified in ISO 16486-5.
This document covers valves for pipes with a nominal outside diameter, dn, ≤400 mm.
Kunststoff-Rohrleitungssysteme für die Gasversorgung - Rohrleitungssysteme aus weichmacherfreiem Polyamid (PA-U) mit Schweißverbindungen und mechanischen Verbindungen - Teil 4: Armaturen (ISO 16486-4:2025)
Dieses Dokument legt die Eigenschaften von Armaturen fest, die nach ISO 16486 1 aus weichmacherfreiem Polyamid (PA U) hergestellt und dafür vorgesehen sind, erdverlegt und für die Versorgung mit gasförmigen Brennstoffen verwendet zu werden.
ANMERKUNG 1 Für die Anwendung dieses Dokuments schließt die Benennung „gasförmige Brennstoffe“ beispielsweise Erdgas, Methan, Butan, Propan, Wasserstoff, Industriegas, Biogas und Gemische dieser Gase ein. Zusätzliche Informationen zur Eignung für 100 % Wasserstoff und dessen Beimischungen mit Erdgas sind in ISO 16486 1:2023, Anhang C und Anhang D enthalten.
Es ist anwendbar für Absperrarmaturen mit einer und mit zwei Durchflussrichtungen, die über Schweißenden oder Heizwendelschweißmuffen verfügen und dafür vorgesehen sind, mit PA-U-Rohren nach ISO 16486 2 und PA-U-Formstücken nach ISO 16486 3 verschweißt zu werden.
Dieses Dokument legt auch die Prüfparameter für die beschriebenen Prüfverfahren fest.
In Verbindung mit ISO 16486 1, ISO 16486 2, ISO 16486 3 und ISO 16486 5 ist dieses Dokument anwendbar für Armaturen aus PA-U und deren Verbindungen untereinander sowie mit Rohrleitungsteilen aus PA-U und anderen Werkstoffen, die für die Verwendung unter den folgenden Bedingungen vorgesehen sind:
a) ein maximal zulässiger Betriebsdruck (MOP, en: maximum operating pressure) bis einschließlich 18 bar oder unter regionalen CEN-Anforderungen begrenzt auf 16 bar, bei einer Bezugstemperatur von 20 °C für Auslegungszwecke;
ANMERKUNG 2 Für die Anwendung dieses Dokumentes und der Verweisungen auf ISO 8233 wird MOP als Nenndruck angesehen.
b) eine Betriebstemperatur von −20 °C bis 40 °C.
ANMERKUNG 3 Für Betriebstemperaturen zwischen 20 °C und 40 °C sind Abminderungskoeffizienten in ISO 16486 5 festgelegt.
Dieses Dokument behandelt Armaturen für Rohre mit einem Nenn-Außendurchmesser dn ≤ 400 mm.
Systèmes de canalisations en matières plastiques pour la distribution de combustibles gazeux - Systèmes de canalisations en polyamide non plastifié (PA-U) avec assemblages par soudage et assemblages mécaniques - Partie 4: Robinets (ISO 16486-4:2025)
Le présent document spécifie les caractéristiques des robinets en polyamide non plastifié (PA-U) conformément à l’ISO 16486-1, destinés à être enterrés et utilisés pour la distribution de combustibles gazeux.
NOTE 1 Pour les besoins du présent document, le terme «combustibles gazeux» inclut par exemple le gaz naturel, le méthane, le butane, le propane, l'hydrogène, le gaz manufacturé, le biogaz et les mélanges de ces gaz. Des informations supplémentaires sur l’aptitude à l’emploi pour l’hydrogène à 100 % et ses mélanges avec du gaz naturel sont données dans l’Annexe C et l’Annexe D de l’ISO 16486-1:2023.
Il s’applique aux robinets d’isolement unidirectionnels et bidirectionnels avec des extrémités à bout mâle ou des emboîtures électrosoudables prévues pour être soudées à des tubes en PA-U conformes à l’ISO 16486-2 et à des raccords en PA-U conformes à l’ISO 16486-3.
Le présent document spécifie également les paramètres d’essai pour les méthodes d’essai qu’il décrit.
Conjointement avec l’ISO 16486-1, l’ISO 16486-2, l’ISO 16486-3 et l’ISO 16486-5, le présent document s’applique aux robinets en PA-U et à leurs assemblages, ainsi qu’aux assemblages avec des composants en PA-U et en d’autres matières destinés à être utilisés dans les conditions suivantes:
a) une pression maximale de service (MOP), inférieure ou égale à 18 bar1) ou limitée à 16 bar en tant qu’exigence régionale du CEN, à une température de référence de 20 °C pour les besoins des calculs;
NOTE 2 Pour les besoins du présent document et en référence à l’ISO 8233, la MOP est considérée comme la pression nominale.
b) une température de service de –20 °C à 40 °C;
NOTE 3 Pour des températures de service comprises entre 20 °C et 40 °C, les facteurs de réduction sont spécifiés dans l’ISO 16486-5.
Le présent document couvre les 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 - Cevni sistemi iz nemehčanega poliamida (PA-U) z zvari in mehanskimi spoji - 4. del: Ventili (ISO 16486-4:2025)
Ta dokument določa značilnosti ventilov iz nemehčanega poliamida (PA-U) v skladu s standardom ISO 16486-1, ki so predvideni za vkop in uporabo za namene oskrbe s plinastimi gorivi. OPOMBA 1: V tem dokumentu izraz »plinska goriva« vključuje npr. zemeljski plin, metan, butan, propan, vodik, industrijski plin, bioplin in njihove mešanice. Dodatne informacije o primernosti za 100-odstotni vodik in njegove mešanice z zemeljskim plinom so podane v dodatkih C in D standarda ISO 16486-1:2023. Uporablja se za enosmerne in dvosmerne ventile s spojnim zaključkom ali elektrofuzijskim spojem, ki so namenjeni za spajanje s cevmi in fitingi iz nemehčanega poliamida v skladu s standardom ISO 16486-2 oziroma ISO 16486-3. Ta dokument določa tudi preskusne parametre za preskusne metode, ki jih opisuje. Ta dokument se v povezavi s standardi ISO 16486-1, ISO 16486-2, ISO 16486-3 in ISO 16486-5 uporablja za ventile iz nemehčanega poliamida in njihove spoje ter spoje s komponentami iz nemehčanega polietilena in drugih materialov, namenjene uporabi v naslednjih pogojih: a) največji obratovalni tlak (MOP) do vključno 18 barov1) ali omejen na 16 barov v skladu z regionalnimi zahtevami CEN pri referenčni temperaturi 20 °C za namene načrtovanja; OPOMBA 2: V tem dokumentu in sklicih na standard ISO 8233 se kot najvišji obratovalni tlak šteje nazivni tlak. b) obratovalna temperatura od –20 °C do 40 °C; OPOMBA 3: Redukcijski koeficienti za obratovalne temperature med 20 °C in 40 °C so določeni v standardu ISO 16486-5. Ta dokument zajema ventile za cevi z nominalnim zunanjim premerom dn ≤ 400 mm.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2025
Cevni sistemi iz polimernih materialov za oskrbo s plinastimi gorivi - Cevni sistemi
iz nemehčanega poliamida (PA-U) z zvari in mehanskimi spoji - 4. del: Ventili (ISO
16486-4:2025)
Plastics piping systems for the supply of gaseous fuels - Unplasticized polyamide (PA-U)
piping systems with fusion jointing and mechanical jointing - Part 4: Valves (ISO 16486-
4:2025)
Kunststoff-Rohrleitungssysteme für die Gasversorgung - Rohrleitungssysteme aus
weichmacherfreiem Polyamid (PA-U) mit Schweißverbindungen und mechanischen
Verbindungen - Teil 4: Armaturen (ISO 16486-4:2025)
Systèmes de canalisations en matières plastiques pour la distribution de combustibles
gazeux - Systèmes de canalisations en polyamide non plastifié (PA-U) avec
assemblages par soudage et assemblages mécaniques - Partie 4 : robinets (ISO 16486-
4:2025)
Ta slovenski standard je istoveten z: EN ISO 16486-4:2025
ICS:
75.200 Oprema za skladiščenje Petroleum products and
nafte, naftnih proizvodov in natural gas handling
zemeljskega plina equipment
83.140.30 Polimerne cevi in fitingi za Plastics pipes and fittings for
snovi, ki niso tekočine non fluid use
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 16486-4
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2025
EUROPÄISCHE NORM
ICS 75.200; 83.140.30 Supersedes EN ISO 16486-4:2022
English Version
Plastics piping systems for the supply of gaseous fuels -
Unplasticized polyamide (PA-U) piping systems with
fusion jointing and mechanical jointing - Part 4: Valves
(ISO 16486-4:2025)
Systèmes de canalisations en matières plastiques pour Kunststoff-Rohrleitungssysteme für die Gasversorgung
la distribution de combustibles gazeux - Systèmes de - Rohrleitungssysteme aus weichmacherfreiem
canalisations en polyamide non plastifié (PA-U) avec Polyamid (PA-U) mit Schweißverbindungen und
assemblages par soudage et assemblages mécaniques - mechanischen Verbindungen - Teil 4: Armaturen (ISO
Partie 4: Robinets (ISO 16486-4:2025) 16486-4:2025)
This European Standard was approved by CEN on 2 June 2025.
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 NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 16486-4:2025 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 16486-4:2025) has been prepared by Technical Committee ISO/TC 138
"Plastics pipes, fittings and valves for the transport of fluids" in collaboration with 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 December 2025, and conflicting national standards
shall be withdrawn at the latest by December 2025.
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 ISO 16486-4:2022.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations 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, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 16486-4:2025 has been approved by CEN as EN ISO 16486-4:2025 without any
modification.
International
Standard
ISO 16486-4
Third edition
Plastics piping systems for
2025-06
the supply of gaseous fuels —
Unplasticized polyamide (PA-U)
piping systems with fusion jointing
and mechanical jointing —
Part 4:
Valves
Systèmes de canalisations en matières plastiques pour la
distribution de combustibles gazeux — Systèmes de canalisations
en polyamide non plastifié (PA-U) avec assemblages par soudage
et assemblages mécaniques —
Partie 4: Robinets
Reference number
ISO 16486-4:2025(en) © ISO 2025
ISO 16486-4:2025(en)
© ISO 2025
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
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Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 16486-4:2025(en)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
3.1 General terms .3
3.2 Terms relating to design .3
4 Symbols and abbreviated terms. 3
5 Material. 4
5.1 Compound for valve body .4
5.1.1 Compound .4
5.1.2 Fusion compatibility .4
5.2 Material for non-polyamide parts .4
5.2.1 General .4
5.2.2 Components and elements .4
5.2.3 Metal parts .4
5.2.4 Elastomers .5
5.2.5 Greases and lubricants .5
5.2.6 Assembly.5
6 General characteristics . 5
6.1 Appearance of the valve .5
6.2 Colour .5
6.3 Design .5
6.3.1 General .5
6.3.2 Valve body .5
6.3.3 Valve terminal ends .5
6.3.4 Operating device.6
6.3.5 Seals .6
7 Geometrical characteristics . 6
7.1 General .6
7.2 Measurement of dimensions .6
7.3 Dimensions of spigot ends for valves.6
7.4 Dimensions of valves with electrofusion sockets .6
7.5 Dimensions of the operating device .6
8 Mechanical characteristics of assembled valves and regional requirements . 7
8.1 General .7
8.2 Conditioning.7
8.3 Requirements .7
8.3.1 General .7
8.3.2 Air flow rate . 13
8.4 Regional requirement . 13
9 Physical characteristics .13
9.1 Conditioning. 13
9.2 Requirement .14
10 Performance requirements . . 14
11 Technical file . 14
12 Marking . .15
12.1 General . 15
12.2 Minimum required marking of valves . 15
12.3 Additional marking. 15
iii
ISO 16486-4:2025(en)
13 Delivery conditions . 16
Annex A (normative) Determination of the leaktightness of seat(s) and packing . 17
Annex B (normative) Test method for leaktightness and ease of operation after tensile loading . 19
Bibliography .21
iv
ISO 16486-4:2025(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the
transport of fluids, Subcommittee SC 7, Valves and auxiliary equipment of plastics materials, in collaboration
with the European Committee for Standardization (CEN) Technical Committee CEN/TC 155, Plastics piping
systems and ducting systems, in accordance with the Agreement on technical cooperation between ISO and
CEN (Vienna Agreement).
This third edition cancels and replaces the second edition (ISO 16486-4:2022), which has been technically
revised.
The main changes are as follows:
— references to information related to the suitability of PA-U piping systems for 100 % hydrogen and its
admixtures with natural gas have been added;
— for the actuation mechanism resistance test, the elements given in the requirements were moved to the
test parameters cells and ‘no leakage’ and ‘no external leakage’ were added in the requirements cells;
— the Bibliography has been updated and extended with additional references.
A list of all parts in the ISO 16486 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
v
ISO 16486-4:2025(en)
Introduction
This document specifies the requirements for valves used in a piping system made from unplasticized
polyamide (PA-U) that is intended to be used for the supply of gaseous fuels.
General requirements for unplasticized polyamide (PA-U) materials used for a piping system and its
components, intended for the supply of gaseous fuels, are specified in ISO 16486-1.
Requirements and test methods for pipes are specified in ISO 16486-2 and for fittings in ISO 16486-3.
Characteristics for fitness for purpose of the system and generic fusion parameters are specified in
ISO 16486-5.
Recommended practice for installation is given in ISO 16486-6, which will not be implemented as a European
standard under the Vienna Agreement.
NOTE 1 Recommended practice for installation is also given in CEN/TS 12007-6, which has been prepared by
Technical Committee CEN/TC 234, Gas infrastructure.
Assessment of conformity of the system is given in ISO/TS 16486-7.
Training and assessment of fusion operators is covered by ISO/TS 16486-8.
NOTE 2 For CEN member countries, the recommended practice for installation is given in CEN/TS 12007-6 and the
[5]
qualification of welders is given by EN 13067.
ISO 16486-1, ISO 16486-2, ISO 16486-3, ISO 16486-5 and ISO 16486-6 as well as ISO/TS 16486-7 and
ISO/TS 16486-8 have been prepared by ISO/TC 138/SC 4. ISO 16486-4 (this document) has been prepared
by ISO/TC 138/SC 7.
NOTE 3 For conformance of components in CEN member countries, relevant EN standards can apply. Alternative
standards can be applied in cases where suitable EN standard(s) do not exist.
The ISO 16486 series covers a range of maximum operating pressures and gives requirements concerning
colours.
It is the responsibility of the purchaser or specifier to make the appropriate selections from these aspects,
taking into consideration their particular requirements and any relevant national regulations and
installation practices or codes.
vi
International Standard ISO 16486-4:2025(en)
Plastics piping systems for the supply of gaseous fuels —
Unplasticized polyamide (PA-U) piping systems with fusion
jointing and mechanical jointing —
Part 4:
Valves
1 Scope
This document specifies the characteristics of valves made from unplasticized polyamide (PA-U) in
accordance with ISO 16486-1, intended to be buried and used for the supply of gaseous fuels.
NOTE 1 For the purpose of this document the term gaseous fuels include for example natural gas, methane, butane,
propane, hydrogen, manufactured gas, biogas, and mixtures of these gases. Additional information about the suitability
for 100 % hydrogen and its admixtures with natural gas is given by ISO 16486-1:2023, Annex C and Annex D.
It is applicable to isolating unidirectional and bi-directional valves with spigot ends or electrofusion
sockets intended to be fused with PA-U pipes conforming to ISO 16486-2 and PA-U fittings conforming to
ISO 16486-3.
This document also specifies the test parameters for the test methods it describes.
In conjunction with ISO 16486-1, ISO 16486-2, ISO 16486-3 and ISO 16486-5, this document is applicable to
PA-U valves and their joints and to joints with components of PA-U and other materials intended to be used
under the following conditions:
1)
a) a maximum operating pressure (MOP) of up to and including 18 bar , or limited to 16 bar under regional
CEN requirements, at a reference temperature of 20 °C for design purposes;
NOTE 2 For the purpose of this document and the references to ISO 8233, MOP is considered to be nominal
pressure.
b) an operating temperature of −20 °C to 40 °C;
NOTE 3 For operating temperatures between 20 °C and 40 °C, derating coefficients are specified in ISO 16486-5.
This document covers valves for 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.
ISO 291, Plastics — Standard atmospheres for conditioning and testing
ISO 307, Plastics — Polyamides — Determination of viscosity number
ISO 1133-2:2011, Plastics — Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR)
of thermoplastics — Part 2: Method for materials sensitive to time-temperature history and/or moisture
1) 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm².
ISO 16486-4:2025(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 1167-4, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of the
resistance to internal pressure — Part 4: Preparation of assemblies
ISO 3126, Plastics piping systems — Plastics components — Determination of dimensions
ISO 3127, Thermoplastics pipes — Determination of resistance to external blows — Round-the-clock method
ISO 8233, Thermoplastics valves — Torque — Test method
ISO 16010, Elastomeric seals — Material requirements for seals used in pipes and fittings carrying gaseous fuels
and hydrocarbon fluids
ISO 16486-1, Plastics piping systems for the supply of gaseous fuels — Unplasticized polyamide (PA-U) piping
systems with fusion jointing and mechanical jointing — Part 1: General
ISO 16486-2, Plastics piping systems for the supply of gaseous fuels — Unplasticized polyamide (PA-U) piping
systems with fusion jointing and mechanical jointing — Part 2: Pipes
ISO 16486-3:2025, Plastics piping systems for the supply of gaseous fuels — Unplasticized polyamide (PA-U)
piping systems with fusion jointing and mechanical jointing — Part 3: Fittings
ISO 16486-5, Plastics piping systems for the supply of gaseous fuels — Unplasticized polyamide (PA-U) piping
systems with fusion jointing and mechanical jointing — Part 5: Fitness for purpose of the system
ISO 17778, Plastics piping systems — Fittings, valves and ancillaries — Determination of gaseous flow rate/
pressure drop relationships
EN 682, Elastomeric seals - Material requirements for seals used in pipes and fittings carrying gas and
hydrocarbon fluids
EN 736-1, Valves Terminology — Part 1: Definition of types of valves
EN 736-2, Valves Terminology — Part 2: Definition of components of valves
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
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 16486-1, EN 736-1, EN 736-2 and
the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
ISO 16486-4:2025(en)
3.1 General terms
3.1.1
external leaktightness
leaktightness of the valve body (3.1.4) 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 (3.1.4) or any component of a valve
3.1.4
valve body
main part of a valve which contains the obturating device (closing element), the seat, the packing seals and
the operating stop, as applicable and provides the terminal ends for connection to the PA-U pipe/fittings
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
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
[6]
[SOURCE: EN 736-3:2008, 3.3.1, modified — Note 1 to entry has been deleted.]
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
[6]
[SOURCE: EN 736-3:2008, 3.3.2, modified — Note 1 to entry has been deleted.]
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 (3.2.1)
[6]
[SOURCE: EN 736-3:2008, 3.3.3, modified — Note 1 to entry has been deleted.]
4 Symbols and abbreviated terms
For the purpose of this document, the symbols and abbreviated terms given in ISO 16486-1 and the
following apply.
M opening and closing torque
ISO 16486-4:2025(en)
5 Material
5.1 Compound for valve body
5.1.1 Compound
The compound from which the valve body with spigot or electrofusion socket is made shall be in accordance
with ISO 16486-1.
The PA-U components of the valve shall be made from virgin material conforming to ISO 16486-1.
5.1.2 Fusion compatibility
Components made from PA-U 11 shall be heat fusion jointed only to components made from PA-U 11.
Components made from PA-U 12 shall be heat fusion jointed only to components made from PA-U 12.
Components made from PA-U are not fusion compatible with components made from other polymers.
5.2 Material for non-polyamide parts
5.2.1 General
Valves made from material other than unplasticized polyamide designed for the supply of gaseous fuels
conforming to the relevant standards are permitted to be used in PA-U piping systems according to the
ISO 16486 series provided they have relevant PA-U connections for butt fusion or electrofusion ends (see
ISO 16486-3). The component, i.e. the complete valve, is required to fulfil the requirements of this document.
5.2.2 Components and elements
All components shall conform to the relevant ISO International Standard(s). Alternative standards may be
applied in cases where a suitable ISO International Standard does 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 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 PA-U pipes conforming to ISO 16486-2, with which they are intended to be used:
a) during storage,
b) under the effect of gaseous fuels being conveyed therein (see ISO 16486-1),
c) taking into account the service environment and operating conditions.
The requirements for the level of material performance of non-polyamide parts shall be at least as stringent
as that of the PA-U compound for the piping system.
Other materials used in valves in contact with the PA-U pipe shall not adversely affect pipe performance or
initiate stress cracking.
The valve manufacturer shall ensure that any transition joint between polyamide and non-polyamide parts
and the valve body fulfil the requirements of ISO 16486-3.
5.2.3 Metal parts
All parts susceptible to corrosion shall be adequately protected, providing this is necessary for the durability
and function of the system.
ISO 16486-4:2025(en)
When dissimilar metallic materials are used which can be in contact with moisture, steps shall be taken to
avoid the possibility of galvanic corrosion.
5.2.4 Elastomers
Elastomeric materials used for the manufacture of seals shall be in accordance with ISO 16010.
The temperature range is defined by the sealing materials product standard.
Other sealing materials are permitted if proven suitable for gas service.
As a regional requirement for CEN member countries, elastomeric seals shall conform to EN 682.
5.2.5 Greases and lubricants
Greases or lubricants shall not exude onto fusion areas and shall not affect the long-term performance of the
valve materials.
5.2.6 Assembly
Ancillary components of valves shall be assembled according to the 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 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.
6.2 Colour
The colour of the PA-U parts of valves shall be either black or yellow.
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 specified 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 terminal ends
PA-U spigot ends or electrofusion sockets shall conform with the requirements as reported in ISO 16486-3.
ISO 16486-4:2025(en)
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.
The position of the obturator should be 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.
In order to prevent stress concentrations, any change in the wall thickness of the valve body should be
gradual.
7.2 Measurement of dimensions
The dimensions of the fittings shall be measured in accordance with ISO 3126, and rounded to the next
0,1 mm. In case of dispute, the measurement of dimensions shall be made not less than 48 h after manufacture.
Additionally, for spigot end valves provided with temporary supports, dimensional measurement shall be
performed 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 ISO 16486-3:2025, Table 4, up to and including d 400 mm.
n
7.4 Dimensions of valves with electrofusion sockets
The dimensions of electrofusion sockets shall conform to ISO 16486-3:2025 Table 1, up to and including
d 400 mm.
n
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
05,
a 50 ± mm square socket, (40 ± 2) mm depth.
[7]
NOTE For a multi-turn operated valve, see ISO 5210.
ISO 16486-4:2025(en)
8 Mechanical characteristics of assembled valves and regional requirements
8.1 General
All tests shall be carried out on valves assembled with pipe conforming to ISO 16486-2 from the same SDR
as the SDR of the valve ends, in accordance with the technical instructions of the manufacturer and taking
into account the extreme conditions of utilisation described in ISO 16486-5.
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).
8.2 Conditioning
Unless otherwise specified in the applicable test method, the test pieces shall be conditioned for at least 16 h
at 23 °C and 50 % relative humidity in accordance with ISO 291 before testing in accordance with Table 1.
The test pieces shall not be tested within the period of 48 h after their manufacture.
8.3 Requirements
8.3.1 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.
ISO 16486-4:2025(en)
Table 1 — Mechanical characteristics of valves
Test parameters
Characteristic Requirements Test method
Parameter Value
a
Hydrostatic No failure during the test Conditioning time 16 h ISO 1167-1
strength period of any test piece
b
ISO 1167-4
Number of test pieces 3
g
(20 °C, 1 000 h)
Type of test Water-in-water
Test temperature 20 °C
Test period 1 000 h
Circumferential (hoop) 19,0 MPa
i
stress 20,0 MPa
c
PA-U 11 and PA-U 12 160
c
PA-U 11 and PA-U 12 180
a
Hydrostatic No failure during the test Conditioning time 16 h ISO 1167-1
strength period of any test piece
b
ISO 1167-4
Number of test pieces 3
g
(80 °C, 165 h)
Type of test Water-in-water
Test temperature 80 °C
Test period 165 h
Circumferential (hoop) 10,0 MPa
i
stress 11,5 MPa
c
PA-U 11 and PA-U 12 160
c
PA-U 11 and PA-U 12 180
f
Leaktightness of No leakage during the Test temperature 23 °C Annex A
seat(s) and packing test period
k
Test fluid Air or nitrogen
b
Number of test pieces 1
Test pressure 25 mbar
Duration of the test 1 h
f
Leaktightness of No leakage during the Test temperature 23 °C Annex A
seat(s) and packing test period
k
Test fluid Air or nitrogen
b
Number of test pieces 1
Test pressure 1,5 MOP
Duration of the test 30 s
a
The valves shall not be pressurized within 24 h after fusion.
b
The numbers of test pieces given indicate the numbers required to establish a value for the characteristic described
in the table. The numbers of test pieces required for factory production control and process control should be listed in the
manufacturer’s quality plan. For guidance, see ISO/TS 16486-7.
c
For material classification and designation, see ISO 16486-1.
d
The maximum operating torque recorded at the 3 testing temperatures shall be within the torque range given in this table
according to ISO 8233 (i.e. opening and closing torque).
e
Tests 2) to 5) shall be carried out on the valve in the order stated, and as soon as possible after 24 h from the completion of
the internal pressure test according to 1).
f +8
For the purpose of factory production control, the test temperature is 23 ( / ) °C and the preconditioning of opening and
-5
closing the valve is not required.
g
The valves shall be in open or partially open position.
h
The test shall be performed by locking the obturator.
i
The test pressure shall be calculated using the design SDR of the valve.
j
The regional CEN requirement according to B.4.4 is not applicable to diameters > 110 mm unless requested by the end user.
k
Testing of leaktightness under pressure with air/nitrogen is appropriate for all gaseous fuels (e.g. methane and hydrogen),
[8]
because no leakage is permitted.
5 2
NOTE 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .
ISO 16486-4:2025(en)
TTabablele 1 1 ((ccoonnttiinnueuedd))
Test parameters
Characteristic Requirements Test method
Parameter Value
WARNING — Safety precautions shall be taken when testing with air or nitrogen up to 1,5 MOP. For testing with air
or nitrogen, a pressure of a maximum of 6 bar should be used. For MOP > 4 bar, testing with water should be consid-
ered, and the test conditions shall be agreed between the manufacturer and end user.
d f
Operating torque Torque range: Test temperatures +23 °C and ISO 8233
For d ≤ 63 mm: −20 °C and
n
5 Nm < M ≤ 35 Nm +40 °C
For
b
Number of test pieces 1
63 mm < d ≤ 125 mm:
n
10 Nm < M ≤ 70 Nm
For
125 mm < d ≤ 400 mm:
n
10 Nm < M ≤ 150 Nm
Stop a) no failure at stops in Test temperature −20 °C and +40 °C ISO 8233
resistance closing and opening
b
Number of test pieces 1
position,
Torque 150 Nm or two times the
value of the maximum
measured operating
torque whichever the
greater
Duration 15 s
Followed by:
b) no leakage at seat Test temperature 23 °C Annex A
and packing
k
Test fluid Air or nitrogen
Number of test pieces 1
Test pressure 1,5 MOP
Duration 30 s
a
The valves shall not be pressurized within 24 h after fusion.
b
The numbers of test pieces given indicate the numbers required to establish a value for the characteristic described
in the table. The numbers of test pieces required for factory production control and process contro
...
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