ISO 5209:2019

INTERNATIONAL ISO
STANDARD 5209
Second edition
2019-08
General purpose industrial valves —
Marking
Appareils de robinetterie industrielle d'usage général — Marquage
Reference number
©
ISO 2019
© ISO 2019
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ii © ISO 2019 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements . 2
4.1 General . 2
4.2 Mandatory markings . . 2
4.3 Supplementary markings . 2
4.4 Other markings . 2
4.5 Omission of markings . 3
5 Details of markings . 4
5.1 Nominal size . 4
5.2 PN/Class designation . 4
5.3 Material . 4
5.4 Manufacturer's name or trademark . 4
5.5 Arrow for direction of flow . 5
5.6 Ring joint number . 5
5.7 Maximum allowable temperature, TS . 5
5.8 Threaded end identification . 5
5.9 Maximum allowable pressure, PS . 5
5.10 Product identification . 5
5.11 Reference to standards . 5
5.12 Melt identification . 5
5.13 Trim . 5
5.14 Service symbols . 5
5.15 Internal coating, liner, lining or internal painting . 5
5.16 Quality and test markings . 6
5.17 Inspector's identification . 6
5.18 Year of manufacture . 6
5.19 Flow coefficient . 6
5.20 Allowable differential pressure, Δp . 6
5.21 Closing direction . 6
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
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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).
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constitute an endorsement.
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.org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 153, Valves.
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.
This second edition cancels and replaces the first edition (ISO 5209:1977), which has been technically
revised. The main changes compared to the previous edition are as follows:
— the structure has been aligned with the current Directives, Part 2;
— Clause 4 has been updated to give the requirements for mandatory, supplementary and other
markings;
— in Table 1, item 20 "Allowable differential pressure", item 21 "Closing direction" and columns 3 to 5
have been added;
— a new Clause 5 has been created to give details of marking.
iv © ISO 2019 – All rights reserved

Introduction
The purpose of this document is to establish some basic requirements for the marking of valves and to
provide recommendations for additional markings.
This document is to be considered in conjunction with the requirements of International Standards
applicable to specific types of valves or specific requirements agreed between the manufacturer and
the customer.
INTERNATIONAL STANDARD ISO 5209:2019(E)
General purpose industrial valves — Marking
1 Scope
This document specifies the requirements for the mandatory and optional markings of general purpose
industrial valves. It defines the method of applying the markings, on the body, on a flange, on an
identification plate or any other location.
This document is considered in conjunction with the specified requirements of the valve product
standards or valve performance standards.
The marking requirements for plastic valves are not within the scope of this document.
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 7-1, Pipe threads where pressure-tight joints are made on t
...