1、BSI Standards PublicationBS ISO 4437-4:2015Plastics piping systems forthe supply of gaseous fuels Polyethylene (PE)Part 4: ValvesBS ISO 4437-4:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 4437-4:2015.The UK participation in its preparation was entrusted
2、 to TechnicalCommittee PRI/88/2, Plastics piping for pressure applications.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapp
3、lication. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 81958 2ICS 75.200; 83.140.30Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strate
4、gy Committee on 30 April 2015.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS ISO 4437-4:2015 ISO 2015Plastics piping systems for the supply of gaseous fuels Polyethylene (PE) Part 4: ValvesSystmes de canalisations en plastique pour la distribution des combustibles gazeu
5、x Polythylne (PE) Partie 4: RobinetsINTERNATIONAL STANDARDISO4437-4First edition2015-04-15Reference numberISO 4437-4:2015(E)BS ISO 4437-4:2015ISO 4437-4:2015(E)ii ISO 2015 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2015All rights reserved. Unless otherwise specified, no part of this publica
6、tion 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 ISOs member body in the country
7、 of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 4437-4:2015ISO 4437-4:2015(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms, definitions, symbol
8、s, and abbreviations 23.1 General terms . 23.2 Terms relating to design . 34 Material 34.1 PE compound . 34.2 Material for non-polyethylene parts 44.2.1 General 44.2.2 Metal parts 44.2.3 Elastomers . 44.2.4 Other materials . 45 General characteristics 45.1 Appearance of the valve 45.2 Colour 55.3 De
9、sign . 55.3.1 General 55.3.2 Valve body 55.3.3 Operating device 55.3.4 Seals 56 Geometrical characteristics 56.1 General . 56.2 Measurement of dimensions . 66.3 Dimensions of spigot ends for valves 66.4 Dimensions of valves with electrofusion sockets 66.5 Dimensions of the operating device . 67 Mech
10、anical characteristics of assembled valves . 67.1 General . 67.2 Requirements . 68 Physical characteristics 108.1 Conditioning . 108.2 Requirements 109 Performance requirements 1110 Marking .1110.1 General 1110.2 Minimum required marking . 1110.3 Additional marking 1211 Delivery conditions .12Annex
11、A (normative) Determination of the leaktightness of seat and packing 13Annex B (normative) Test method for leaktightness and ease of operation after tensile loading .14Bibliography .16 ISO 2015 All rights reserved iiiContents PageBS ISO 4437-4:2015ISO 4437-4:2015(E)ForewordISO (the International Org
12、anization 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 establi
13、shed 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 standardizatio
14、n.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 t
15、he 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 pate
16、nt 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 a
17、n explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT), see the following URL: Foreword Supplementary information .The committee responsible for th
18、is document is ISO/TC 138, Plastics pipes, fittings and valves for the transport of fluids, Subcommittee SC 7, Valves and auxiliary equipment of plastics materials.This first edition cancels and replaces ISO 10933:1997.ISO 4437 consists of the following parts, under the general title Plastics piping
19、 systems for the supply of gaseous fuels Polyethylene (PE) : Part 1: General Part 2: Pipes Part 3: Fittings Part 4: Valves Part 5: Fitness for purpose of the systemiv ISO 2015 All rights reservedBS ISO 4437-4:2015ISO 4437-4:2015(E)IntroductionCharacteristics for fitness for purpose are covered in IS
20、O 4437-5. ISO/TS 10839 gives recommended practices for installation. ISO 2015 All rights reserved vBS ISO 4437-4:2015BS ISO 4437-4:2015Plastics piping systems for the supply of gaseous fuels Polyethylene (PE) Part 4: Valves1 ScopeThis part of ISO 4437 specifies the characteristics of valves made fro
21、m polyethylene (PE) for piping systems in the field of the supply of gaseous fuels.It also specifies the test parameters for the test methods referred to in this part of ISO 4437.In conjunction with ISO 4437-1, ISO 4437-2, ISO 4437-3:2014, and ISO 4437-5, it is applicable to PE valves, their joints,
22、 and to joints with components of PE and other materials intended to be used under the following conditions:a) the maximum operating pressure, MOP, is based on the design stress determined from the compound MRS divided by the C factor and taking into account RCP requirements;b) temperature of 20 C a
23、s reference temperature;NOTE 1 For other operating temperatures, derating coefficients are given in ISO 4437-5:2014.c) operating temperature between 20 C and +40 C.This International Standard covers a range of maximum operating pressures and gives requirements concerning colours and additives.NOTE 2
24、 It is the responsibility of the purchaser or specifier to make the appropriate selections from these aspects, taking into account their particular requirements and any relevant national regulations and installation practices or codes.It is applicable to bi-directional valves with spigot ends or ele
25、ctrofusion sockets intended to be jointed with PE pipes conforming to ISO 4437-2 without any fittings or with PE fittings conforming to ISO 4437-3:2014.This part of ISO 4437 covers valves for pipes with a nominal outside diameter dn 400 mm.NOTE 3 Valves made from materials other than polyethylene de
26、signed for the supply of gaseous fuels conforming to the relevant standards are permitted to be used in PE piping systems according to ISO 4437 provided that they have relevant PE connections for butt fusion or electrofusion ends (see ISO 4437-3). The component, i.e. the complete valve, shall fulfil
27、 the requirements of this part of ISO 4437.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of th
28、e referenced document (including any amendments) applies.ISO 1133-1, Plastics Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR) of thermoplastics Part 1: Standard methodISO 1167-1, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids Determination o
29、f the resistance to internal pressure Part 1: General methodINTERNATIONAL STANDARD ISO 4437-4:2015(E) ISO 2015 All rights reserved 1BS ISO 4437-4:2015ISO 4437-4:2015(E)ISO 1167-4, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids Determination of the resistance to internal p
30、ressure Part 4: Preparation of assembliesISO 3126, Plastics piping systems Plastics components Determination of dimensionsISO 3127, Thermoplastics pipes Determination of resistance to external blows Round-the-clock methodISO 4437-1, Plastics piping systems for the supply of gaseous fuels Polyethylen
31、e (PE) Part 1: GeneralISO 4437-2, Plastics piping systems for the supply of gaseous fuels Polyethylene (PE) Part 2: PipesISO 4437-3:2014, Plastics piping systems for the supply of gaseous fuels Polyethylene (PE) Part 3: FittingsISO 4437-5, Plastics piping systems for the supply of gaseous fuels Poly
32、ethylene (PE) Part 5: Fitness for purpose of the systemISO 8233, Thermoplastics valves Torque Test methodISO 11357-6, Plastics Differential scanning calorimetry (DSC) Part 6: Determination of oxidation induction time (isothermal OIT) and oxidation induction temperature (dynamic OIT)ISO 12176-4, Plas
33、tics pipes and fittings Equipment for fusion jointing polyethylene systems Part 4: Traceability codingISO 16010, Elastomeric seals Material requirements for seals used in pipes and fittings carrying gaseous fuels and hydrocarbon fluidsISO 17778, Plastics piping systems Fittings, valves and ancillari
34、es Determination of gaseous flow rate/pressure drop relationshipsEN 736-1, Valves Terminology Part 1: Definition of types of valvesEN 736-2, Valves Terminology Part 2: Definition of components of valvesEN 1680, Plastics piping systems Valves for polyethylene (PE) piping systems Test method for leakt
35、ightness under and after bending applied to the operating mechanismsEN 1704, Plastics piping systems Thermoplastics valves Test method for the integrity of a valve after temperature cycling under bendingEN 1705, Plastics piping systems Thermoplastics valves Test method for the integrity of a valve a
36、fter an external blowEN 12100, Plastics piping systems Polyethylene (PE) valves Test method for resistance to bending between supportsEN 12119, Plastics piping systems Polyethylene (PE) valves Test method for resistance to thermal cycling3 Terms, definitions, symbols, and abbreviationsFor the purpos
37、es of this document, the terms, definitions, symbols, and abbreviations given in ISO 4437-1, EN 736-1, EN 736-2, and the following apply.3.1 General terms3.1.1external leaktightnessleaktightness of the valve body enveloping the space containing the gas with respect to the atmosphere3.1.2internal lea
38、ktightnessleaktightness between the inlet and the outlet of the valve with the valve in the closed position2 ISO 2015 All rights reservedBS ISO 4437-4:2015ISO 4437-4:2015(E)3.1.3leaktightness testtest for both of the following characteristics:a) internal leaktightness of a valves closing seat when c
39、losed and pressurized from either side;b) external leaktightness of a valve when half open3.1.4initiating torquetorque required to initiate movement of the obturator3.1.5running torquetorque required to achieve full opening or closing of the valve at maximum allowable operating pressure3.1.6leakagee
40、mission of gas from a valve body or any component of a valve3.1.7valve bodymain part of a valve which contains the obturating device (closing element, seat, packing seals, and operating stop) as applicable and provides the terminal ends for connection to the PE pipe/fittings3.1.8operating devicepart
41、 of a valve for connection with the operating key which allows the opening and the closing of the valve3.2 Terms relating to design3.2.1full bore valvevalve with a flow section equal to or greater than 80 % of the section corresponding to the nominal inside diameter of the body end portSOURCE: EN 73
42、6-3:20083.2.2clearway valvevalve designed to have an unobstructed flow way which allows for the passage of a theoretical sphere with a diameter that is not less than the nominal inside diameter of the body end portSOURCE: EN 736-3:20083.2.3reduced bore valvevalve with a flow section equal to or grea
43、ter than 36 % of the section corresponding to the nominal inside diameter of the body end port and which does not correspond to the full bore valveSOURCE: EN 736-3:20084 Material4.1 PE compoundThe PE compound from which the valve body with spigot ends or electrofusion sockets is made shall conform t
44、o ISO 4437-1. The stress bearing parts shall only be made from virgin material conforming to ISO 4437-1. ISO 2015 All rights reserved 3BS ISO 4437-4:2015ISO 4437-4:2015(E)4.2 Material for non-polyethylene parts4.2.1 GeneralAll components shall conform to the relevant International Standards. Alterna
45、tive standards may be applied in cases where suitable International Standards do not exist.In all cases, fitness for purpose of the components shall be demonstrated.The materials and the constituent elements used in making the valve (including elastomers, greases, and any metal parts, as may be used
46、) shall be resistant to the external and internal environments as the other elements of the piping system and shall have a life expectancy under the following conditions at least equal to that of the PE pipes conforming to ISO 4437-2 with which they are intended to be used:a) during storage;b) under
47、 the effect of the gas conveyed therein;c) with respect to the service environment and operating conditions.The requirements for the level of material performance of non-polyethylene parts shall be at least as stringent as that of the PE compound for the piping system. Rework materials shall not be
48、used for stress bearing polymeric parts.Other materials used in valves in contact with the PE pipe shall not adversely affect pipe performance or initiate stress cracking.Metal valve bodies for PE piping systems up to 10 bar should conform to the relevant standard of ISO 153.4.2.2 Metal partsAll met
49、al parts susceptible to corrosion shall be adequately protected, provided that this is necessary for the durability and function of the system.When dissimilar metallic materials are used which might be in contact with moisture, steps shall be taken to avoid the possibility of galvanic corrosion.4.2.3 ElastomersElastomeric seals shall conform to ISO 16010.Other sealing materials are permitted if proven suitable for gas service.4.2.4 Other materialsG
