EN ISO 8659:2020

Thermoplastics valves - Fatigue strength - Test method (ISO 8659:2020)

This document specifies the endurance test necessary to confirm the ability of hand-operated plastics valves to withstand prolonged use, with repeated opening and closure. It does not specify the ability of valves to withstand adverse conditions, in particular those of chemically aggressive fluid media and/or environments, or excessive fluid velocities and cavitation.
NOTE    Concerning the chemical aggression of the materials, a classification table is reported in ISO/TR 10358[1].
This document includes values of the parameters necessary for the proper performance of the endurance test, with the reservation that the parameters are different in particular product standards (see 5.1).

Armaturen aus Thermoplasten - Ermüdungsfestigkeit - Prüfverfahren (ISO 8659:2020)

Dieses Dokument legt die Dauerprüfung fest, die notwendig ist, um sicherzustellen, dass handbetätigte Armaturen aus Kunststoff geeignet sind, einer längeren Gebrauchsdauer mit wiederholtem Öffnen und Schließen standzuhalten. Es werden keine Anforderungen festgelegt für die Widerstandsfähigkeit von Armaturen gegenüber ungünstigen Bedingungen, insbesondere chemisch aggressiven Flüssigkeiten und/oder Umgebungen oder übermäßige Fließgeschwindigkeiten und Kavitation.
ANMERKUNG Zur chemischen Beständigkeit der Werkstoffe ist eine Klassifikationstafel in ISO/TR 10358 [1] angegeben.
Dieses Dokument enthält Prüfparameter, die notwendig für eine ordnungsgemäße Durchführung der Dauerprüfung sind, mit dem Vorbehalt, dass die Prüfparameter in den einzelnen Produktnormen abweichen (siehe 5.1).

Robinets en matériaux thermoplastiques - Résistance à la fatigue - Méthode d'essai (ISO 8659:2020)

Le présent document spécifie les essais de fatigue nécessaires pour confirmer l'aptitude des appareils de robinetterie en matières plastiques manoeuvrés à la main à résister à un usage prolongé, avec ouvertures et fermetures répétées. Il ne spécifie pas l'aptitude des appareils de robinetterie à résister à des conditions défavorables, en particulier celles de fluides et/ou environnements chimiquement agressifs, ou des vitesses excessives des fluides et la cavitation.
NOTE       En ce qui concerne l'aggression chimique des matériaux, un tableau de classification est donné dans l'ISO/TR 10358[1].
Le présent document intègre les valeurs des paramètres nécessaires pour une performance correcte de l'essai de fatigue, sous réserve que les paramètres sont différents dans les normes de produits particulières (voir 5.1).

Plastomerni ventili - Trajna nihajna trdnost - Preskusna metoda (ISO 8659:2020)

General Information

• Status: Published
• Publication Date: 21-Apr-2020
• Withdrawal Date: 30-Oct-2020
• ICS: 23.060.01 - Valves in general
• ICS: 83.140.30 - Plastics pipes and fittings for non fluid use
• Technical Committee: CEN/TC 69 - Industrial valves
• Drafting Committee: CEN/TC 69 - Industrial valves
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 22-Apr-2020
• Completion Date: 22-Apr-2020
• Directive: 305/2011 - Regulation (eu) No 305/2011 of the European Parliament and of the Council of 9 march 2011 laying down harmonised conditions for the marketing of construction products and repealing council directive 89/106/eec
• Directive: 90/531/EEC - Procurement procedures of entities operating in the water, energy, transport and telecommunications sectors
• Directive: 93/38/EEC - Procurement procedures of entities operating in the water, energy, transport and telecommunications sectors
• Mandate: M/BC/CEN/88/15 - Standardization request to CEN/CENELEC in the field of Water supply, drainage and sewerage
• Ref Project: SIST EN ISO 8659:2020 - Thermoplastics valves - Fatigue strength - Test method (ISO 8659:2020)

Relations

• Replaces: EN 28659:1990 - Thermoplastics valves - Fatigue strength - Test method (ISO 8659:1989)
• Effective Date: 11-May-2020

Overview

EN ISO 8659:2020 - Thermoplastics valves - Fatigue strength - Test method specifies an endurance (fatigue) test for hand‑operated thermoplastics (plastic) valves to confirm their ability to withstand prolonged cyclic operation (repeated opening and closing). Adopted by CEN as EN ISO 8659:2020, this standard defines the test apparatus, cycle procedure, parameter values and required test reporting. It does not cover resistance to chemically aggressive media, extreme velocities or cavitation (see ISO/TR 10358 for chemical aggression classification).

Keywords: thermoplastics valves, fatigue strength, endurance test, ISO 8659:2020, valve fatigue testing, hand-operated plastics valves.

Key topics and technical requirements

• Scope & limits: Applies to fatigue (endurance) testing of hand‑operated thermoplastic valves; adverse chemical or hydraulic aggression excluded.
• Apparatus: Equipment must test the complete valve assembly without imposing axial forces on end connections or radial forces on the stem; include means to pause cycles during pressurization and to maintain closed pressure. Instrument accuracies: pressure gauges ±1% FS, temperature sensors ±2 °C.
• Procedure (endurance cycle):
  • Open valve: multiple‑turn valves - hand‑wheel speed 40 r/min ±10 r/min (≤ DN50) or 20 r/min ±10 r/min (> DN50); quarter‑turn valves - opening time ≥2 s (≤ DN50) and ≥4 s (> DN50). Valve held open 5–20 s.
  • Close valve: multiple‑turn at 40 r/min ±10 r/min; quarter‑turn closing time ≥1 s. Closing performed using torque specified in relevant product standard.
  • Apply internal pressure in closed position for 5–20 s.
  • Repeat cycles as required by the applicable product standard.
• Test media & conditions: Water, air or gas at temperatures, pressures and velocities specified in product standards.
• Test report requirements: Reference to ISO 8659 and product standard; valve identification (type - ball, butterfly, diaphragm, gate, globe - material, DN, PN, manufacturer), opening/closing torques, test conditions, number of specimens, pass/fail and failure mode.

Applications and users

• Who uses it: valve manufacturers, independent test laboratories, product designers, quality/production engineers, certification and compliance bodies, procurement and specification writers.
• Practical uses:
  • Validate durability and operational life of thermoplastic valves used in industrial and fluid transport systems.
  • Provide objective endurance data for design verification, product standards compliance and buyer specifications.
  • Support failure analysis by recording opening/closing torque changes and leakage/fracture outcomes.

Related standards

• ISO 161‑1 (nominal diameters/pressures), ISO 16135, ISO 16136, ISO 16138, ISO 16139, ISO 21787 (thermoplastic ball, butterfly, diaphragm, gate, globe valve product standards)
• ISO/TR 10358 (chemical aggression classification)
• Supersedes: EN 28659:1990

This standard is essential when specifying or testing the fatigue strength and operational endurance of thermoplastic valves in non‑aggressive service conditions.

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2020
Nadomešča:
SIST EN 28659:1997
Plastomerni ventili - Trajna nihajna trdnost - Preskusna metoda (ISO 8659:2020)
Thermoplastics valves - Fatigue strength - Test method (ISO 8659:2020)
Armaturen aus Thermoplasten - Ermüdungsfestigkeit - Prüfverfahren (ISO 8659:2020)
Robinets en matériaux thermoplastiques - Résistance à la fatigue - Méthode d'essai (ISO
8659:2020)
Ta slovenski standard je istoveten z: EN ISO 8659:2020
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 8659
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2020
EUROPÄISCHE NORM
ICS 23.060.01; 83.140.30 Supersedes EN 28659:1990
English Version
Thermoplastics valves - Fatigue strength - Test method
(ISO 8659:2020)
Robinets en matériaux thermoplastiques - Résistance à Armaturen aus Thermoplasten - Ermüdungsfestigkeit -
la fatigue - Méthode d'essai (ISO 8659:2020) Prüfverfahren (ISO 8659:2020)
This European Standard was approved by CEN on 29 March 2020.

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
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 8659:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 8659:2020) 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 October 2020, and conflicting national standards shall
be withdrawn at the latest by October 2020.
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 28659:1990.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association.
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 8659:2020 has been approved by CEN as EN ISO 8659:2020 without any modification.

INTERNATIONAL ISO
STANDARD 8659
Second edition
2020-04
Thermoplastics valves — Fatigue
strength — Test method
Robinets en matériaux thermoplastiques — Résistance à la fatigue
— Méthode d'essai
Reference number
ISO 8659:2020(E)
©
ISO 2020
ISO 8659:2020(E)
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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ii © ISO 2020 – All rights reserved

ISO 8659:2020(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Apparatus . 2
5 Procedure. 2
5.1 Test requirements to be taken from product standards . 2
5.2 Endurance test . 3
6 Test report . 3
Bibliography . 5
ISO 8659:2020(E)
Foreword
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