EN ISO 16486-4:2022

SLOVENSKI STANDARD
01-maj-2022
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
16486-4:2022)
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-
4:2022)
Kunststoff-Rohrleitungssysteme für die Gasversorgung - Rohrleitungssysteme aus
weichmacherfreiem Polyamid (PA-U) mit Schweißverbindungen und mechanischen
Verbindungen - Teil 4: Armaturen (ISO 16486-4:2022)
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-
4:2022)
Ta slovenski standard je istoveten z: EN ISO 16486-4:2022
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
January 2022
EUROPÄISCHE NORM
ICS 75.200; 83.140.30
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 16486-4:2022)
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 16486-4:2022) 16486-4:2022)
This European Standard was approved by CEN on 15 January 2022.

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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 16486-4:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Annex (informative)  A-deviation . 4

European foreword
This document (EN ISO 16486-4:2022) 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 July 2022, and conflicting national standards shall be
withdrawn at the latest by July 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.
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, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 16486-4:2022 has been approved by CEN as EN ISO 16486-4:2022 without any
modification.
Annex
(informative)
A-deviation
A-deviation: National deviation due to regulations, the alteration of which is for the time being outside the competence of the CEN-CENELEC
national member.
This European Standard does not fall under any Directive of the EU.
In the relevant CEN-CENELEC countries these A-deviations are valid instead of the provisions of the European Standard until they have been
removed.
Country Clause Deviation
ITALY §1 According to Italian legislation concerning the safety of gas installation
Scope
- DM 16 April 2008 (DSO) prescribes that piping and components used in distribution system shall be in accordance with
national standard UNI 9034 (pipes with MOP below 5 bar). In case of MOP greater than 5 bar DM 17 April 2008 shall be
followed.
th
(Official Journal Italian Republic GU n. 107 of 8 May 2008
https://www.gazzettaufficiale.it/eli/id/2008/05/08/08A02871/sg)
- DM 17 April 2008 (TSO) prescribes that piping and components used in transmission system shall be made of steel (art.
3.1 of Technical Annex A to Decree).
th
(Official Journal Italian Republic GU n. 107 of 8 May 2008
https://www.gazzettaufficiale.it/atto/serie_generale/caricaDettaglioAtto/originario?atto.dataPubblicazioneGazzetta=2008-
05-08&atto.codiceRedazionale=08A02872&elenco30giorni=false)

INTERNATIONAL ISO
STANDARD 16486-4
Second edition
2022-01
Plastics piping systems for 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 16486-4:2022(E)
ISO 16486-4:2022(E)
© ISO 2022
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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 16486-4:2022(E)
Contents Page
Foreword .v
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
3.1 General . 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 Metal parts . 4
5.2.3 Elastomers . 5
5.2.4 Greases and lubricants . 5
5.2.5 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. 5
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 Generals . 7
8.3.2 Air flow rate .12
8.4 Regional requirement .12
9 Physical characteristics .13
9.1 Conditioning.13
9.2 Requirement .13
10 Performance requirements . .13
11 Technical File .13
12 Marking . .14
12.1 General . 14
12.2 Minimum required marking of valves . 14
12.3 Additional marking. 15
iii
ISO 16486-4:2022(E)
13 Delivery Conditions .15
Annex A (normative) Determination of the leaktightness of seat(s) and packing .16
Annex B (normative) Test method for leaktightness and ease of operation after tensile
loading .18
Bibliography .20
iv
ISO 16486-4:2022(E)
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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
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 second edition cancels and replaces the first edition (ISO 16486-4:2016), which has been
technically revised.
The main changes are as follows:
— the Scope highlights that this document is valid for On/Off valves;
1)
— the Scope shows 16 bar as the regional CEN requirement for the limitation of the maximum
operating pressure (MOP);
— in 7.3 and 7.4 the nominal diameter of spigot ends or electrofusion sockets has been expanded to d
n
400 mm;
— a new subclause, 5.2.4 Greases and lubricants, has been added;
— subclause 5.2 for non-unplasticized polyamide parts has been redrafted to bring it in line with EN
1555-4. A NOTE for regional requirements has been introduced;
— subclauses 6.3.1 General, 6.3.2 Valve body, 7.5 Dimensions of the operating device and 8.1 General
have been redrafted;
— a new subclause, 6.3.3 Valve terminal ends, has been introduced for valve terminal ends;
— subclauses 6.3.4 Operating device and 6.3.5 Seals have been modified to bring them in line with EN
1555-4;
5 2
1) 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .
v
ISO 16486-4:2022(E)
— subclause 7.2 Measurement of dimensions has been modified to bring it in line with EN 1555-4 with
the exception that PA-U conditioning does not allow the use of test pieces earlier than 48 h after
their manufacture;
— subclause 8.4 Regional requirements has been added with reference to an extension of subclause B.1.1
for CEN;
b
— in Table 1, the number of test pieces has been added and new footnote has been inserted relating
to this addition;
— in Table 1, the condition period has been changed to 16 h;
— in Table 1, the test period has been changed to 1 000 h for hydrostatic strength (20 °C, 1 000 h);
— in Table 1, the pressure drop test been deleted, as this is covered in the new subclause 8.3.2;
— in Table 1, the operating torque for 125 mm < d ≤ 400 mm has been changed to 10 Nm < M ≤ 150;
n
j
— in Table 1, leaktightness after tensile load is added, including footnote for limiting the diameter;
— a new subclause, 5.1.2 Fusion compatibility, substitutes the former subclause 6.4;
— a new Clause 11 Technical File has become an individual paragraph in line with EN 1555-4;
— subclause 12.1 General includes a NOTE for regional marking requirements on packaging, with
reference to CEN/TS 12007-6, for CEN member countries, for example;
— Table 3 for minimum required marking of valves has been modified in line with EN 1555-4;
— former subclause 12.5 Packaging has become Clause 13 Delivery conditions, and has been modified
and extended;
— Annex A has been updated in line with EN 1555-4;
— Annex B has been modified according longitudinal stress parameters in line with ISO 17885:2021,
Table F.1;
— in Clause B.2 Test piece, the definition for the length of test piece has been redrafted;
— in Annex B, subclause B.4.4 has been added including a regional requirement.
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.
vi
ISO 16486-4:2022(E)
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.
[2]
NOTE Recommended practice for installation is also given in CEN/TS 12007-6 , which has been prepared
by Technical Committee CEN/TC 234, Gas infrastructure.
2)
Assessment of conformity of the system is to form the subject of the future ISO/TS 16486-7:— .
For CEN member countries, all components are to conform to the relevant EN standard(s). Alternative
standards may be applied in cases where the 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.
2) Under preparation. Stage at the time of publication: ISO/WD TS 16486-7:2022.
vii
INTERNATIONAL STANDARD ISO 16486-4:2022(E)
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.
It is applicable to isolating unidirectional and bi-directional valves with spigot ends or electrofusion
sockets intended to be fused with PA-U pipes or fittings conforming to ISO 16486-2 and ISO 16486-3
respectively.
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.
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:
3)
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 1 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 2 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
3) 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm².
ISO 16486-4:2022(E)
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 16486-3:2020, 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
ISO 16486-4:2022(E)
— IEC Electropedia: available at https:// www .electropedia .org/
3.1 General
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
[4]
inside diameter of the body end port[SOURCE: EN 736-3:2008, 3.3.1]
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-
[4]
3:2008, 3.3.2]
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)
[4]
[SOURCE: EN 736-3:2008, 3.3.3]
4 Symbols and abbreviated terms
For the purpose of this document, the symbols and abbreviated terms given in ISO 16486-1 apply.
ISO 16486-4:2022(E)
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
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 the fluids being conveyed, and
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.
5.2.2 Metal parts
All 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 can be in contact with moisture, steps shall be taken
to avoid the possibility of galvanic corrosion.
ISO 16486-4:2022(E)
5.2.3 Elastomers
Elastomeric materials used for the manufacture of seals shall be in accordance with ISO 16010. 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.
5.2.4 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 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.
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.
ISO 16486-4:2022(E)
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 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, it is recommended that any change in the wall thickness of
the valve body is 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 16486-3:2020, Table 4, up to and including d
n
400 mm.
7.4 Dimensions of valves with electrofusion sockets
The dimensions of electrofusion sockets shall conform to ISO 16486-3:2020 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
05,
with a 50± mm square socket, (40 ± 2) mm depth.
NOTE For a multi-turn operated valve, attention is drawn to the requirements specified in ISO 5210.
ISO 16486-4:2022(E)
8 Mechanical characteristics of assembled valves and regional requirements
8.1 General
All tests shall be carried out on valves assembled with pipe from the same SDR conforming to
ISO 16486-2, 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 Generals
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 16486-4:2022(E)
Table 1 — Mechanical characteristics of valves
Test parameters
Characteristic Requirements Test method
Parameter Value
a
Hydrostatic No failure during the test period of Conditioning time 16 h ISO 1167-1
strength any test piece
b
Number of test pieces 3
g ISO 1167-4
(20 °C, 1 000 h)
Type of test Water-in-water
Test temperature 20 °C
Test period 1 000 h
i
Circumferential (hoop) stress 19,0 MPa
c
PA-U 11 and PA-U 12 160 20,0 MPa
c
PA-U 11 and PA-U 12 180
a
Hydrostatic No failure during the test period of Conditioning time 16h ISO 1167-1
c
strength any test piece
b
Number of test pieces 3 ISO 1167-4
g
(80 °C, 165 h)
Type of test Water-in-water
Test temperature 80 °C
Test period 165 h
i
Circumferential (hoop) stress 10,0 MPa
c
PA-U 11 and PA-U 12 160 11,5 MPa
c
PA-U 11 and PA-U 12 180
f
Leaktightness of No leakage during the test period Test temperature 23 °C Annex A
seat(s) and packing
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 period Test temperature 23 °C Annex A
seat(s) and packing
Test fluid Air or nitrogen
b
Number of test pieces 1
Test pressure 1,5 * MOP
Duration of the test 30 s
WARNING — Safety precautions need to 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 considered, 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 63 mm < d ≤ 125 mm:
n
b
Number of test pieces 1
10 Nm < M ≤ 70 Nm
For 125 mm < d ≤ 400 mm:
n
10 Nm < M ≤ 150 Nm
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 16486-1:2020,
d
The maximum operating torque recorded at the 3 testing temperatures shall be within the torque range given in this table according to
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