1、 ISO 2014 Road vehicles Liquefied natural gas (LNG) fuel system components Part 3: Check valve Vhicules routiers quipements pour vhicules utilisant le gaz naturel liqufi (GNL) comme combustible Partie 3: Valve de contrle INTERNATIONAL STANDARD ISO 12614-3 First edition 2014-07-01 Reference number IS
2、O 12614-3:2014(E) ISO 12614-3:2014(E)ii ISO 2014 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2014 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopyin
3、g, 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 of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-
4、mail copyrightiso.org Web www.iso.org Published in Switzerland ISO 12614-3:2014(E) ISO 2014 All rights reserved iii Contents Page Foreword iv 1 Scope . 1 2 Normative references 1 3 Terms and definitions . 1 4 Marking 2 5 Construction and assembly . 2 6 Test 2 6.1 Applicability 2 6.2 Hydrostatic stre
5、ngth 3 6.3 Leakage 3 6.4 Continued operation 3 ISO 12614-3:2014(E) 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
6、 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
7、 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 f
8、or the different types of ISO documents 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). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent righ
9、ts. ISO shall not be held responsible for identifying any or all such patent rights. 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 thi
10、s document is information given for the convenience of users and does not constitute 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 t
11、o Trade (TBT) see the following URL: Foreword - Supplementary information The committee 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
12、(LNG) fuel system components: Part 1: General requirements and definitions Part 2: Performance and general test methods Part 3: Check valve Part 4: Manual valve Part 5: Tank pressure gauge Part 6: Overpressure regulator Part 7: Pressure relief valve Part 8: Excess flow valve Part 9: Gas-tight housin
13、g and ventilation hose Part 10: Rigid fuel line in stainless steel Part 11: Fittings Part 12: Rigid fuel line in material other than stainless steel Part 13: Pressure control regulator Part 14: Differential pressure fuel content gauge Part 15: Capacitance fuel content gaugeiv ISO 2014 All rights res
14、erved ISO 12614-3:2014(E) Part 16: Heat exchanger vaporizer Part 17: Natural gas detector Part 18: Gas temperature sensor ISO 2014 All rights reserved v Road vehicles Liquefied natural gas (LNG) fuel system components Part 3: Check valve 1 Scope This part of ISO 12614 specifies tests and requirement
15、s for the check valve, a liquefied natural gas fuel system component intended for use on the types of motor vehicles defined in ISO 3833. This part of ISO 12614 is not applicable to the following: a) fuel containers; b) stationary gas engines; c) container mounting hardware; d) electronic fuel manag
16、ement; 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 appropriate functional tests. NOTE 2 All references to pressure in this part of ISO 12614
17、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) . Other working pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio). For example, 2 MPa
18、 (20 bar) working pressure system will require pressures to be multiplied by 1,25. 2 Normative references The 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 und
19、ated references, the latest edition of the referenced document (including any amendments) applies. ISO 3833, Road vehicles Types Terms and definitions ISO 12614-1, Road vehicles Liquefied natural gas (LNG) fuel system components Part 1: General requirements and definitions ISO 12614-2, Road vehicles
20、 Liquefied natural gas (LNG) fuel system components Part 2: Performance and general test methods 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 12614-1 apply. 1) 1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm 2 . INTERNATIONAL ST ANDARD ISO 12614-3:2014(E
21、) ISO 2014 All rights reserved 1 ISO 12614-3:2014(E) 4 Marking Marking 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 (part number); c) the working pressure or pressure and
22、 temperature range. The following additional markings are recommended: a) the direction of flow (when necessary for correct installation); b) the type of fuel; c) electrical ratings (if applicable); d) the symbol of the certification agency; e) the type approval number; f) the serial number or date
23、code; g) reference to this part of ISO 12614 (i.e. ISO 12614-3). NOTE This information can be provided by a suitable identification code on at least one part of the component when it consists of more than one part. 5 Construction and assembly The check valve shall comply with the applicable provisio
24、ns of ISO 12614-1 and ISO 12614-2 and with the tests specified in Clause 6 of this part of ISO 12614. 6 Test 6.1 Applicability The tests required to be carried out are indicated in Table 1.2 ISO 2014 All rights reserved ISO 12614-3:2014(E) Table 1 Tests applicable Test Applicable Test procedure as r
25、equired by ISO 12614-2 Specific test requirements of this part of ISO 12614 Hydrostatic strength X X X (see 6.2) Leakage X X X (see 6.3) Excess torque resistance X a X Bending moment X X Continued operation X X X (see 6.4) Corrosion resistance X X Oxygen ageing X X Electrical over voltages Non-metal
26、lic material immer- sion X X Vibration resistance X X Brass material compatibility X X aNot applicable for check valves built into other components. 6.2 Hydrostatic strength Test the check valve according to the procedure for testing hydrostatic strength specified in ISO 12614-2. The test pressure s
27、hall be 2,5 times the working pressure. 6.3 Leakage Test the check valve at the temperatures and pressures given in Table 2. Table 2 Test temperatures and pressures Temperature C Pressure Factor x Working Pressure First Second 162 1,0 x WP 0,25 x WP 20 0,25 x WP 1,5 x WP 85 or 120 0,25 x WP 6.4 Cont
28、inued operation The check valve shall be capable of withstanding 7 000 cycles of operation when submitted to the following test procedure. Connect the check valve to a test fixture and apply a pressure of 1,25 times the working pressure to the check valves inlet, then vent pressure from its outlet.
29、Lower the pressure on the check valves outlet side to between 0 and a maximum of 0,5 times the test pressure prior to the next cycle. Failure in any sense during the procedure shall constitute a failure of the check valve. All parts shall remain in position and function properly after this test. After this test, the check valve shall comply with the hydrostatic test according to 6.2. ISO 2014 All rights reserved 3 ISO 12614-3:2014(E) ISO 2014 All rights reserved ICS 43.060.40 Price based on 3 pages
