EN 28659:1990
(Main)Thermoplastics valves - Fatigue strength - Test method (ISO 8659:1989)
Thermoplastics valves - Fatigue strength - Test method (ISO 8659:1989)
Specifies a method for testing the fatigue strength and performance of thermoplastic valves incorporated in a valve assembly with its obturator mechanism under pressure. Repeated opening and closing shall be performed for as many cycles and using the torque as specified by the particular product standard.
Armaturen aus Thermoplasten - Ermüdungsfestigkeit - Prüfverfahren (ISO 8659:1989)
Robinets en matériaux thermoplastiques - Résistance à la fatigue - Méthode d'essai (ISO 8659:1989)
La présente Norme internationale prescrit les essais de fatigue nécessaires pour confirmer l'aptitude des robinets en matières plastiques manoeuvrés à la main à résister à un usage prolongé, avec ouvertures et fermetures répétées. Elle ne prescrit pas les essais nécessaires pour confirmer l'aptitude de ces robinets à résister à des conditions particulièrement défavorables, comme, par exemple, des fluides transportés et/ou environnement chimiquement agressifs, une vitesse excessive des fluides, une cavitation. La présente Norme internationale prescrit des valeurs pour une bonne exécution de l'essai de fatigue, sous réserve qu'il n'y ait pas d'autres paramètres dans les normes de produit particulières (voir 5.1).
Plastomerni ventili - Trajna nihajna trdnost - Preskusna metoda (ISO 8659:1989)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-februar-1997
Plastomerni ventili - Trajna nihajna trdnost - Preskusna metoda (ISO 8659:1989)
Thermoplastics valves - Fatigue strength - Test method (ISO 8659:1989)
Armaturen aus Thermoplasten - Ermüdungsfestigkeit - Prüfverfahren (ISO 8659:1989)
Robinets en matériaux thermoplastiques - Résistance a la fatigue - Méthode d'essai (ISO
8659:1989)
Ta slovenski standard je istoveten z: EN 28659:1990
ICS:
83.140.30 Cevi, fitingi in ventili iz Plastics pipes, fittings and
polimernih materialov valves
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
INTERNATIONAL ISO
STANDARD 8659
First edition
1989-07-01
Thermoplastics valves - Fatigue strength -
Test method
Robine ts en ma t&iaux thermoplastiques -
Resistance i Ia fa tigue - A& thode
d’essai
Reference number
ISO 8659 : 1989 (EI
ISO8659 :1989 (E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of
national Standards bodies (ISO member bedies). The work sf preparing International
Standards is normally carried out through ISO technical committees. Esch 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, govern-
mental 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.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the ISO Council. They are approved in accordance with ISO procedures requiring at
least 75 % approval by the member bodies voting.
International Standard ISO 8659 was prepared by Technical Committee lSO/TC 138,
Plastics pipes, fittings and valves for the transport of fluids.
0 ISO 1989
All rights reserved. No part of this publication may be reproduced or utilized in any form or by any
means, electronie or mechanical, including photocopying and microfilm, without Permission in
writing from the publisher.
International Organization for Standardization
Case postale 56 l CH-121 1 Geneve 20 l Switzerland
Printed in Switzerland
ii
ISO 8659: 1989 (El
Introduction
The aim of this International Standard is to establish certain basic requirements for the
endurante testing of plastics valves to ensure that uniform test methods are adopted.
This International Standard must be considered in conjunction with any specific re-
quirements in particular product Standards applicable to the individual types of valves.
. . .
Ill
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ISO 8659 : 1989 (E)
INTERNATIONAL STANDARD
Thermoplastics valves - Fatigue strength - Test method
1 Scope 3 Definitions
For the purposes of this International Standard, the following
This International Standard specifies the endurante test
definitions apply.
necessary to tonfirm the ability of hand-operated plastics
valves to withstand prolonged use, with repeated opening and
closure. lt does not specify the ability of valves to withstand
3.1 nominal pressure (PN) : An alphanumerical designation
adverse conditions, in particular those of chemically agressive
of pressure, used for reference purposes, which is related to
fluid media and/or environments, or excessive fluid velocities
the mechanical strength of the valve. Usually it corresponds to
and cavitation.
the pressure of water at 20 OC, in bars, for which the valve is
designed (sec also ISO 161-1).
This International Standard includes values of the Parameters
necessary for the proper Performance of the endurante test,
3.2 closing torque: Torque required to close a valve to full
with the reservation that Parameters may be different in par-
tightness at the nominal pressure.
ticular product Standards (see 5.1).
3.3 fluid velocity: The velocity of a fluid in a pipe connected
2 Normative references
to a valve of nominal size equivalent to the nominal diameter of
the Pipe.
The following Standards contain provisions which, thro
...
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