1、BSI Standards PublicationBS ISO 12614-8:2014Road vehicles Liquefiednatural gas (LNG) fuel systemcomponentsPart 8: Excess flow valveBS ISO 12614-8:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 12614-8:2014.The UK participation in its preparation was entru
2、sted to TechnicalCommittee GSE/40, Gas supply equipment for natural gas vehicles.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 corr
3、ectapplication. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 77155 2ICS 43.060.40Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy
4、 Committee on 31 July 2014.Amendments issued since publicationDate Text affectedBS ISO 12614-8:2014 ISO 2014Road vehicles Liquefied natural gas (LNG) fuel system components Part 8: Excess flow valveVhicules routiers quipements pour vhicules utilisant le gaz naturel liqufi (GNL) comme combustible Par
5、tie 8: Valve de limitation de dbitINTERNATIONAL STANDARDISO12614-8First edition2014-07-01Reference numberISO 12614-8:2014(E)BS ISO 12614-8:2014ISO 12614-8:2014(E)ii ISO 2014 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2014All rights reserved. Unless otherwise specified, no part of this publi
6、cation 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 count
7、ry 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 12614-8:2014ISO 12614-8:2014(E) ISO 2014 All rights reserved iiiContents PageForeword iv1 Scope . 12 Normative refe
8、rences 13 Terms and definitions . 14 Marking 25 Construction and assembly . 26 Test 36.1 Applicability 36.2 Hydrostatic strength 36.3 Leakage 36.4 Excess torque resistance 46.5 Bending moment . 46.6 Continued operation 46.7 Operation . 4Bibliography 5BS ISO 12614-8:2014ISO 12614-8:2014(E)ForewordISO
9、 (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 com
10、mittee 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 electrot
11、echnical 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 draft
12、ed 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 patent rights. ISO shall not be held responsible for identifying any or all such patent righ
13、ts. Details of 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).Any trade name used in this document is information given for the convenience of users and does not constitu
14、te an endorsement.For an 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 informationThe commit
15、tee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 25, Vehicles using gaseous fuels.ISO 12614 consists of the following parts, under the general title Road vehicles Liquefied natural gas (LNG) fuel system components: Part 1: General requirements and definitions Part 2: Pe
16、rformance and general test methods Part 3: Check valve Part 4: Manual valve Part 5: Tank pressure gauge Part 6: Pressure regulator Part 7: Pressure relief valve Part 8: Excess flow valve Part 9: Gas-tight housing and ventilation hose Part 10: Rigid fuel line in stainless steel Part 11: Fittings Part
17、 12: Rigid fuel line in copper and its alloys Part 13: Pressure control regulator Part 14: Differential pressure fuel content gauge Part 15: Capacitance fuel content gaugeiv ISO 2014 All rights reservedBS ISO 12614-8:2014ISO 12614-8:2014(E) Part 16: Heat exchanger vaporizer Part 17: Natural gas dete
18、ctor Part 18: Gas temperature sensor ISO 2014 All rights reserved vBS ISO 12614-8:2014BS ISO 12614-8:2014Road vehicles Liquefied natural gas (LNG) fuel system components Part 8: Excess flow valve1 ScopeThis part of ISO 12614 specifies tests and requirements for the excess flow valve, a liquefied nat
19、ural gas fuel system component intended for use on the types of motor vehicles defined in ISO 3833. This part of ISO 12614 is applicable to vehicles using natural gas in accordance with ISO 15403 (mono-fuel, bi-fuel, or dual-fuel applications). It is not applicable to the following:a) fuel container
20、s;b) stationary gas engines;c) container mounting hardware;d) electronic fuel management;e) refueling receptacles.NOTE 1 It is recognized that miscellaneous components not specifically covered herein can be examined to meet the criteria of this part of ISO 12614 and tested according to the appropria
21、te functional tests.NOTE 2 All references to pressure in this part of ISO 12614 are to be considered gauge pressures unless otherwise specified.NOTE 3 This part of ISO 12614 is based upon a working pressure for natural gas as a fuel of 1,6 MPa (16 bar). (1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm2.) O
22、ther working pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio). For example, a 2 MPa (20 bar) working pressure system will require pressures to be multiplied by 1,25.2 Normative referencesThe following documents, in whole or in part, are normatively referenced
23、 in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 12614-1, Road vehicles Liquefied natural gas (LNG) fuel system components Pa
24、rt 1: General requirements and definitionsISO 12614-2, Road vehicles Liquefied natural gas (LNG) fuel system components Part 2: Performance and general test methods3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 12614-1 and the following apply.3.1inte
25、rnal excess flow valveexcess flow valve installed inside the cylinder or cylinder valveINTERNATIONAL STANDARD ISO 12614-8:2014(E) ISO 2014 All rights reserved 1BS ISO 12614-8:2014ISO 12614-8:2014(E)3.2external excess flow valveexcess flow valve installed outside the cylinder or cylinder valve3.3shut
26、-off type excess flow valveexcess flow valve that stops flow when in the closed position3.4flow-limiter type excess flow valveexcess flow valve that limits flow when activatedNote 1 to entry: The device resets automatically when the excess flow condition is no longer present.3.5activationdifferentia
27、l pressure flow or other condition specified by the manufacturer at which the excess flow valve is activated4 MarkingMarking of the component shall provide sufficient information to allow the following to be traced:a) the manufacturers or agents name, trademark, or symbol;b) the model designation (p
28、art number);c) the operating specifications (working pressure, temperature range, excess flow valve type, activation flow, or P, max. flow when activated).The following additional markings are recommended:a) the direction of flow (when necessary for correct installation);b) the type of fuel;c) elect
29、rical ratings (if applicable);d) the symbol of the certification agency;e) the type approval number;f) the serial number or date code;g) a reference to this part of ISO 12614 (i.e. ISO 12614-8:2014).NOTE This information can be provided by a suitable identification code on at least one part of the c
30、omponent when it consists of more than one part.5 Construction and assemblyThe excess flow valve shall comply with the applicable provisions of ISO 12614-1 and ISO 12614-2, and with the tests specified in Clause 6.2 ISO 2014 All rights reservedBS ISO 12614-8:2014ISO 12614-8:2014(E)6 Test6.1 Applicab
31、ilityThere are many types of excess flow valves available. This part of ISO 12614 provides requirements for two different designs: internal and external excess flow valves. A valve of either design could be one of two different types: shut-off or flow-limiter. As excess flow valve designs vary, so w
32、ill the tests required.The function of an excess flow valve can be achieved in other ways. For example, instead of using a mechanical device, an electronic system can be adopted to ensure the closing or limiting of the gas flow from the cylinder in an accident.The tests required to be carried out ar
33、e indicated in Table 1.Table 1 Tests applicableTest ApplicableTest procedure as required by ISO 12614-2Specific test requirements of this part of ISO 12614Hydrostatic strength X X X (see 6.2)Leakage X X X (see 6.3)Excess torque resistance X X X (see 6.4)Bending moment X X X (see 6.5)Continued operat
34、ion X X X (see 6.6)Corrosion resistance X XOxygen ageing X XNon-metallic synthetic immersion X XVibration resistance X XBrass material compatibility X XOperation X X (see 6.7)6.2 Hydrostatic strengthTest the excess flow valve according to the procedure for testing hydrostatic strength specified in I
35、SO 12614-2. For internal or external excess flow valves, the test pressure shall be 2,5 times the working pressure.6.3 LeakageThe internal leakage test shall be conducted on shut-off type excess flow valves. The excess flow valve shall have an internal leakage rate less than 30 Ncm3/h.Test the exces
36、s flow valve at the temperatures and pressures given in Table 2.Table 2 Test temperatures and pressuresTemperature CFirst test pressure Second test pressure160 1,0 working pressure Operational pressure20 Operational pressure1,5 working pressure85 Operational pressure ISO 2014 All rights reserved 3BS
37、 ISO 12614-8:2014ISO 12614-8:2014(E)6.4 Excess torque resistanceThe excess torque resistance test shall be conducted only on external excess flow valves. See ISO 12614-2.6.5 Bending momentThe bending moment test shall be conducted only on external excess flow valves. See ISO 12614-2.6.6 Continued op
38、eration6.6.1 Cycle the excess flow valve 20 times at working pressure differential pressure. One cycle shall consist of one opening and one closing. Upon completion of the test, the valve shall comply with 6.3 and 6.7.6.6.2 Following cycling, operation, and leakage retesting, perform the hydrostatic
39、 test in accordance with 6.2.6.7 OperationMeasure the activation flow or P and the flow of the excess flow valve when it activates. Perform the test using the activation conditions stated by the manufacturer; the measured flows and pressures shall meet the manufacturers specified flow.4 ISO 2014 All
40、 rights reservedBS ISO 12614-8:2014ISO 12614-8:2014(E)Bibliography1 ISO 3833, Road vehicles Types Terms and definitions ISO 2014 All rights reserved 5BS ISO 12614-8:2014ISO 12614-8:2014(E) ISO 2014 All rights reservedICS 43.060.40Price based on 5 pagesThis page deliberately left blankBSI is the nati
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