ISO 4437-4:2022
(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 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 isolating valves with spigot ends or electrofusion sockets intended to be fused with PE pipes or fittings conforming to ISO 4437−2 and ISO 4437‑3 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 ISO 4437 series, provided that they have PE connections for butt fusion or electrofusion ends, including integrated material transition joints, conforming to ISO 4437-3. 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 the ISO 4437 series, this document 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[1] 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 between −20 °C to 40 °C. NOTE 2 For operating temperatures between 20 °C and 40 °C, derating coefficients are defined in ISO 4437‑5. This document covers valve bodies designed for connection with pipes with a nominal outside diameter dn ≤ 400 mm. [1] 1 bar = 0,1 MPa =105 Pa; 1 MPa = 1 N/mm2.
Systèmes de canalisations en plastique pour la distribution des combustibles gazeux — Polyéthylène (PE) — Partie 4: Robinets
General Information
Relations
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 4437-4
Second edition
2022-11
Plastics piping systems for the supply
of gaseous fuels — Polyethylene
(PE) —
Part 4:
Valves
Systèmes de canalisations en plastique pour la distribution des
combustibles gazeux — Polyéthylène (PE) —
Partie 4: Robinets
Reference number
© 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
Contents Page
Foreword .v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
3.1 General . 2
3.2 Terms relating to design . 3
4 Symbols and abbreviations .3
5 Material. 3
5.1 Material for polyethylene parts . . 3
5.2 Material for non-polyethylene parts . 4
5.2.1 General . 4
5.2.2 Metal parts . 4
5.2.3 Sealing materials . 4
5.2.4 Greases and lubricants . 4
5.2.5 Assembly. 4
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 ends . 5
6.3.4 Operating device. 5
6.3.5 Seals . 5
7 Geometrical characteristics . 5
7.1 General . 5
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 . 6
8.1 General . 6
8.2 Requirements . 6
8.2.1 General . 6
8.2.2 Air flow rate . 13
9 Physical characteristics .13
9.1 Conditioning.13
9.2 Requirements . 14
10 Performance requirements . .14
11 Technical file .14
12 Marking . .15
12.1 General . 15
12.2 Minimum required marking . 15
12.3 Additional marking. 16
13 Delivery conditions .16
Annex A (normative) Determination of the leaktightness of seat(s) and packing .17
iii
Annex B (normative) Test method for leaktightness and ease of operation after tensile
loading .19
Bibliography .21
iv
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.
This second edition cancels and replaces the first edition (ISO 4437-4:2015), which has been technically
revised.
The main changes are as follows:
— PE 100-RC type materials with enhanced resistance to slow crack growth have been added;
— an improved description of the leaktightness test has been 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 including new methods for PE 100-RC materials.
A list of all parts in the ISO 4437 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
Introduction
This document specifies the requirements for a piping system and its components made from
polyethylene (PE) and intended to be used for the supply of gaseous fuels.
Requirements and test methods for material and components, other than valves, are specified in
ISO 4437-1, ISO 4437-2 and ISO 4437-3.
[2]
Characteristics for fitness for purpose are covered in ISO 4437-5. CEN/TS 1555-7 gives guidance for
[1]
assessment of conformity. Recommended practice for installation is given in ISO/TS 10839 .
This document covers the characteristics of valves.
The ISO 4437 series covers a range of maximum operating pressures and gives requirements concerning
colours. It is the responsibility of the p
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.