EN ISO 8233:2024

SLOVENSKI STANDARD
01-maj-2024
Plastomerni ventili - Vrtilni moment - Preskusna metoda (ISO 8233:2024)
Thermoplastics valves - Torque - Test method (ISO 8233:2024)
Armaturen aus Thermoplasten - Drehmoment - Prüfverfahren (ISO 8233:2024)
Robinets en matériaux thermoplastiques - Couple de manoeuvre - Méthode d'essai (ISO
8233:2024)
Ta slovenski standard je istoveten z: EN ISO 8233:2024
ICS:
23.060.01 Ventili na splošno Valves in general
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 8233
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2024
EUROPÄISCHE NORM
ICS 23.060.01; 83.140.30 Supersedes EN 28233:1990
English Version
Thermoplastics valves - Torque - Test method (ISO
8233:2024)
Robinets en matériaux thermoplastiques - Couple de Armaturen aus Thermoplasten - Drehmoment -
manoeuvre - Méthode d'essai (ISO 8233:2024) Prüfverfahren (ISO 8233:2024)
This European Standard was approved by CEN on 23 February 2024.

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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 8233:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 8233:2024) 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
69 “Industrial valves” the secretariat of which is held by AFNOR.
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 September 2024, and conflicting national standards
shall be withdrawn at the latest by September 2024.
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 28233:1990.
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 8233:2024 has been approved by CEN as EN ISO 8233:2024 without any modification.

International
Standard
ISO 8233
Second edition
Thermoplastics valves — Torque —
2024-03
Test method
Robinets en matériaux thermoplastiques — Couple de manoeuvre
— Méthode d'essai
Reference number
ISO 8233:2024(en) © ISO 2024
ISO 8233:2024(en)
© ISO 2024
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 8233:2024(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test specimen . 2
5 Test condition . 2
5.1 General .2
5.2 Conditioning time .3
5.3 Test pressure .3
6 Apparatus . 3
7 Procedure for torque test . 3
8 Test report . 4
Bibliography . 5

iii
ISO 8233:2024(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 document 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 69, Industrial valves,
in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 8233:1988), which has been technically
revised.
The main changes are as follows:
— the normative references clause (Clause 2) and the terms and definitions clause (Clause 3) have been
updated;
— the type of valve has been specified in the test report and the opening torque has been explained.
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.

iv
ISO 8233:2024(en)
Introduction
The aim of this document is to establish certain basic requirements for the torque testing of plastics valves
to ensure that uniform test methods are adopted. This document is intended to be considered in conjunction
with any specific requirements, in particular product standards, applicable to the individual types of valves.

v
International Standard ISO 8233:2024(en)
Thermoplastics valves — Torque — Test method
1 Scope
This document specifies a test method for the determination of the opening, closing and running torque of
thermoplastics valves.
This document is applicable to all types of manually operable thermoplastics valves, with or without
actuator, intended to be used for the transport of fluids.
NOTE 1 Examples of valve types tested with this method are in ISO 4437-4, ISO 16135, ISO 16136, ISO 16138,
[13] [14]
ISO 16139, ISO 16486-4, ISO 21787, EN 1555-4 and EN 12201-4 .
This document does not specify the relationship between the torque and its possible increase after prolonged
use of the valve under a specific working condition or wear/chemical aggression of the materials.
NOTE 2 Concerning the chemical aggression of the materials, a collection of data is reported in ISO/TR 10358
concerning the endurance test necessary to confirm the ability of hand-operated plastics valves to withstand
prolonged use with repeated opening and closing operations. Further information is provided in ISO 8659.
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 161-1, Thermoplastics pipes for the conveyance of fluids — Nominal outside diameters and nominal pressures
— Part 1: Metric series
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 161-1 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following address
...