1、 ISO 2012 Road vehicles Compressed natural gas (CNG) fuel system components Part 3: Check valve Vhicules routiers Composants des systmes de combustible gaz naturel comprim (GNC) Partie 3: Valve de contrle INTERNATIONAL STANDARD ISO 15500-3 Second edition 2012-04-15 Reference number ISO 15500-3:2012(
2、E) ISO 15500-3:2012(E) ii ISO 2012 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2012 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without
3、 permission in writing 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-mail copyrightiso.org Web www.iso.org Published in Switzerland ISO 15500-3:2012(E) Fo
4、reword 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 committees. Each member body interested in a subject for which a tec
5、hnical 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 the International Electrotechnical Commission (IEC) on all matters o
6、f electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated
7、to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. 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 fo
8、r identifying any or all such patent rights. ISO 15500-3 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 25, Vehicles using gaseous fuels. This second edition cancels and replaces the first edition (ISO 15500-3:2001), which has been technically revised. ISO 15500 consis
9、ts of the following parts, under the general title Road vehicles Compressed natural gas (CNG) 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: Manual cylinder valve Part 6: Automatic val
10、ve Part 7: Gas injector Part 8: Pressure indicator Part 9: Pressure regulator Part 10: Gas-flow adjuster Part 11: Gas/air mixer Part 12: Pressure relief valve (PRV) Part 13: Pressure relief device (PRD) Part 14: Excess flow valve Part 15: Gas-tight housing and ventilation hose Part 16: Rigid fuel li
11、ne in stainless steel Part 17: Flexible fuel line Part 18: Filter Part 19: Fittings ISO 2012 All rights reserved iii ISO 15500-3:2012(E) Part 20: Rigid fuel line in material other than stainless steel iv ISO 2012 All rights reserved ISO 15500-3:2012(E) Introduction For the purposes of this part of I
12、SO 15500, all fuel system components in contact with natural gas have been considered suitable for natural gas as defined in ISO 15403. However, it is recognized that miscellaneous components not specifically covered herein can be examined to meet the criteria of this part of ISO 15500 and tested ac
13、cording to the appropriate functional tests. All references to pressure in this part of ISO 15500 are considered to be gauge pressures unless otherwise specified. This part of ISO 15500 is based on a service pressure for natural gas used as fuel of 20 MPa 200 bar 1) settled at 15 C. Other service pr
14、essures can be accommodated by adjusting the pressure by the appropriate factor (ratio). For example, a 25 MPa (250 bar) service pressure system will require pressures to be multiplied by 1,25. 1) 1 bar = 0,1 MPa = 10 5Pa 1 MPa = 1 N/mm 2 . ISO 2012 All rights reserved v Road vehicles Compressed nat
15、ural gas (CNG) fuel system components Part 3: Check valve 1 Scope This part of ISO 15500 specifies tests and requirements for the check valve, a compressed natural gas (CNG) fuel system component intended for use on the types of motor vehicles defined in ISO 3833. This part of ISO 15500 is applicabl
16、e to vehicles (mono-fuel, bi-fuel or dual-fuel applications) using natural gas in accordance with ISO 15403 (all parts). It is not applicable to the following: a) liquefied natural gas (LNG) fuel system components located upstream of, and including, the vaporizer; b) fuel containers; c) stationary g
17、as engines; d) container-mounting hardware; e) electronic fuel management; f) refuelling receptacles. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the la
18、test edition of the referenced document (including any amendments) applies. ISO 15500-1, Road vehicles Compressed natural gas (CNG) fuel system components Part 1: General requirements and definitions ISO 15500-2, Road vehicles Compressed natural gas (CNG) fuel system components Part 2: Performance a
19、nd general test methods 3 T erms and definitio ns For the purposes of this document, the terms and definitions given in ISO 15500-1 apply. 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 sy
20、mbol; b) the model designation (part number); c) the working pressure or working pressure and temperature range. INTERNATIONAL STANDARD ISO 15500-3:2012(E) ISO 2012 All rights reserved 1 ISO 15500-3:2012(E) The following additional markings are recommended: the direction of flow (when necessary for
21、correct installation); the type of fuel; electrical ratings (if applicable); the symbol of the certification agency; the type approval number; the serial number or date code; reference to this part of ISO 15500. NOTE This information can be provided by a suitable identification code on at least one
22、part of the component when it consists of more than one part. 5 Construction and assembly The check valve shall comply with the applicable provisions of ISO 15500-1 and ISO 15500-2, and with the tests specified in Clause 6 of this part of ISO 15500. 6 Tests 6.1 Applicability The tests required to be
23、 carried out are indicated in Table 1. Table 1 Applicable tests Test Applicable Test procedure as required by ISO 15500-2 Sp eci fic t est requirement s of this part of ISO 15500 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
24、operation X X X (see 6.4) Corrosion resistance X X Oxygen ageing X X Electrical over-voltages Non-metallic material immersion 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 acco
25、rding to the procedure for testing hydrostatic strength specified in ISO 15500-2. The test pressure shall be 2,5 times the working pressure. 6.3 Leakage Test the check valve at the temperatures and pressures given in Table 2. 2 ISO 2012 All rights reserved ISO 15500-3:2012(E) Table 2 Test temperatur
26、es and pressures Temperature C Pressure Factor working pressure (WP) First test Second test 40 or 20 0,75 WP 0,025 WP 20 0,025 WP 1,5 WP 85 or 120 0,05 WP 6.4 Continued operation The check valve shall be able to withstand 20 000 cycles of operation and 24 h of chatter flow when tested according to t
27、he following procedure. a) Connect the check valve to a test fixture and apply a pressure equal to the working pressure to the check valves inlet, then vent pressure from its outlet. Lower the pressure on the check valves outlet side to between 0 and a maximum of 0,5 times the working pressure prior
28、 to the next cycle. b) Following 20 000 cycles of operation, subject the check valve to 24 h of chatter flow at a flow rate that causes the most chatter. After this test, the check valve shall comply with the leakage test according to 6.3. Failure in any sense during the procedure shall constitute a
29、 failure of the check valve. All parts shall remain in position and function properly after this test. Following this test, the check valve shall comply with the hydrostatic strength test according to 6.2 of this part of ISO 15500. ISO 2012 All rights reserved 3 ISO 15500-3:2012(E) Bibliography 1 IS
30、O 3833, Road vehicles Types Terms and definitions 2 ISO 15403-1, Natural gas Natural gas for use as a compressed fuel for vehicles Part 1: Designation of the quality 3 ISO/TR 15403-2, Natural gas Natural gas for use as a compressed fuel for vehicles Part 2: Specification of the quality 4 ISO 2012 All rights reservedISO 15500-3:2012(E) ISO 2012 All rights reserved ICS 43.060.40 Price based on 4 pages
