1、 ISO 2012 Road vehicles Compressed natural gas (CNG) fuel system components Part 6: Automatic valve Vhicules routiers Composants des systmes de combustible gaz naturel comprim (GNC) Partie 6: Valve automatique INTERNATIONAL STANDARD ISO 15500-6 Second edition 2012-04-15 Reference number ISO 15500-6:
2、2012(E) ISO 15500-6:2012(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, wi
3、thout 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 15500-6:2012(
4、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 committees. Each member body interested in a subject for which
5、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 the International Electrotechnical Commission (IEC) on all matt
6、ers of 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 circul
7、ated 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 responsib
8、le for identifying any or all such patent rights. ISO 15500-6 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 15500-6:2001), which has been technically revised. ISO 15500 c
9、onsists 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: Automati
10、c valve 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 fu
11、el line in stainless steel Part 17: Flexible fuel line Part 18: Filter Part 19: Fittings ISO 2012 All rights reserved iii ISO 15500-6:2012(E) Part 20: Rigid fuel line in material other than stainless steel iv ISO 2012 All rights reserved ISO 15500-6:2012(E) Introduction For the purposes of this part
12、 of ISO 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 test
13、ed according 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 servi
14、ce pressures 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 = 1N/mm 2 . ISO 2012 All rights reserved v Road vehicles Compressed
15、 natural gas (CNG) fuel system components Part 6: Automatic valve 1 Scope This part of ISO 15500 specifies tests and requirements for the automatic 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
16、is applicable to vehicles (mono-fuel, bi-fuel or dual-fuel applications) using natural gas in accordance with ISO 15403. 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 IEC 60079-10-1, Explosive atmospheres Part 10-1: Classification of areas Explosive gas atmospheres 3 T erms and definitio ns For the purposes of this document, the terms and definitions given in ISO 15500-1 and the following apply. 3.1 automatic valve on/off valve for control
20、ling flow of gas that is not manually operated INTERNATIONAL STANDARD ISO 15500-6:2012(E) ISO 2012 All rights reserved 1 ISO 15500-6:2012(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
21、symbol; b) the model designation (part number); c) working pressure or working pressure and temperature range. The following additional markings are recommended: the direction of flow (when necessary for correct installation); the type of fuel; electrical ratings (if applicable); the symbol of the c
22、ertification 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 part of the component when it consists of more than one part. 5 Construction and assembly The au
23、tomatic 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. All automatic valves, including solenoid valves, cylinder valves and valves with manual by-pass, shall comply with the tests specified in Clau
24、se 6. An automatic valve shall be closed when de-energized. An automatic valve with manual by-pass shall meet the minimum requirements of this part of ISO 15500. 6 Tests 6.1 Applicability The tests required to be carried out are indicated in Table 1. 2 ISO 2012 All rights reserved ISO 15500-6:2012(E
25、) 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 X Bending moment X X Continued operation X X X (see 6.4) Corrosion res
26、istance X X Oxygen ageing X X Electrical over-voltages X X Non-metallic material immersion X X Vibration resistance X X Brass material compatibility X X Insulation resistance X X (see 6.5) Minimum opening voltage X X (see 6.6) Pressure impulse X X (see 6.7) 6.2 Hydrostatic strength Test the automati
27、c valve according 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 automatic valve at the temperatures and pressures given in Table 2. Table 2 Test temperatures and pressures Temperature C Pres
28、sure 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 6.4.1 Test the automatic valve in accordance with the procedure for testing continued operation given in ISO 15500-2, for 50 000 cycles, but lower the downs
29、tream pressure of the test fixture to less than 2 % of working pressure, and perform the leakage test in accordance with 6.3 of this part of ISO 15500. The valve shall continue to operate according to the manufacturers specifications. 6.4.2 Following cycling and leakage testing, perform the hydrosta
30、tic strength test in accordance with 6.2 of this part of ISO 15500. 6.5 Insulation resistance The insulation resistance test is designed to check for a potential failure of the insulation between the two-pin coil assembly and the automatic valve casing. ISO 2012 All rights reserved 3 ISO 15500-6:201
31、2(E) If the automatic valve is electrically operated and is to be used inside a gas-tight housing, it shall be intrinsically safe as defined in IEC 60079-10-1. Apply DC 1 000 V between one of the connector pins and the housing of the automatic valve for at least 2 s. The minimum allowable resistance
32、 shall be 240 k . 6.6 Minimum opening voltage The minimum opening voltage at room temperature shall be 8 V for a 12 V system and 16 V for a 24 V system. The component shall be pressurized at 0,75 times working pressure during the test. 6.7 Pressure impulse The automatic valve that is exposed in serv
33、ice to cylinder pressure, shall withstand 100 pressure pulses, as follows. a) If the automatic valve is external, connect both inlet and outlet to a pipe or tube of the type specified by the manufacturer and of at least 1 m in length each. b) If the automatic valve is mounted to or inside the cylind
34、er valve, the cylinder valve containing the automatic valve shall be connected securely by a suitable fitting to a pressurized source of dry air, nitrogen or natural gas. Connect the outlet to a pipe or tube of the type specified by the manufacturer and of at least 1 m in length each. c) The outlet
35、of the automatic valve shall be vented until the inlet is at atmospheric pressure, and then the outlet of the valve shall be closed. d) Working pressure shall be instantaneously applied to the inlet. e) Test the component in the same way with reverse flow direction. Following the pressure impulse te
36、st, the automatic valve should operate according to the manufacturers specification. This test was included in order to evaluate the performance of the components that may suffer from the effects of an instantaneous increase in pressure. In normal service, this may happen, for example, when filling
37、gas in an empty system or when a solenoid valve opens the flow of gas to an empty fuel line. Previous tests have revealed that certain designs cannot cope with these instantaneous pulses and the components tend to bend or jam. 4 ISO 2012 All rights reserved ISO 15500-6:2012(E) Bibliography 1 ISO 383
38、3, 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 ISO 2012 All rights reserved 5ISO 15500-6:2012(E) ISO 2012 All rights reserved ICS 43.060.40 Price based on 5 pages
