ISO 15500-6-2020 pdf download.Road vehicles一Compressed natural gas (CNG) fuel system components一 Part 6: Automatic valve. 6.4.3 If the automatic valve is to be used in vehicles with start-stop systems, and closed during commanded stop phases, the valve shall be submitted to the following numbers of operations during testing: a) 200 000 cycles (mark NHV) if the engine shuts off automatically when the vehicle comes to a halt; b) 500 000 cycles (mark “H2) if, in addition to a), the engine also shuts off automatically when the vehicle drives with the electric motor only; c) 1 000 000 cycles (mark “H3) if, in addition to a) or b), the engine also shuts off automatically when the accelerator pedal is released. 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. 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 shall be 240 kil. 6.6 Minimum opening voltage The minimum opening voltage at room temperature shall be 8 V for a 12 V system and
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