ISO 20766-16:2022 pdf – Road vehicles — Liquefied petroleum gas (LPG) fuel system components — Part 16: Injectors and gas mixing device/fuel rail.
1 Scope This document specifies general requirements for the injectors and gas mixing device/fuel rail, components of liquefied petroleum gas fuel, intended for use on the types of motor vehicles as defined in ISO 3833. It also provides general design principles and specifies requirements for instructions and marking. This document is applicable to vehicles (mono-fuel, bi-fuel or dual-fuel applications) using gaseous fuels in accordance with ISO 9162. It is not applicable to the following: a) fuel containers; b) stationary gas engines; c) container mounting hardware; d) electronic fuel management; e) refuelling receptacles. It is recognized that miscellaneous components not specifically addressed herein can be examined for compliance with the criteria of any applicable part of the ISO 20766 series, including testing to the appropriate functional tests. All references to pressure in this document are considered gauge pressures unless otherwise specified. This document applies to devices which have a service pressure in the range of 110 kPa (butane rich at 20 °C) and 840 kPa (propane at 20 °C), hereinafter referred to in this document. Other service pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio).
2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 20766-1, Road vehicles — Liquefied petroleum gas (LPG) fuel systems components — Part 1: General requirements and definitions ISO 20766-2:2018, Road vehicles — Liquefied petroleum gas (LPG) fuel systems 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 20766-1 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https://www.iso .org/obp — IEC Electropedia: available at https://www.electropedia .org/ 4 Markings Marking of the component shall provide sufficient information to allow the following to be traced: a) the manufacturer ’s or agent ’s name, trademark or symbol; b) the model designation (part number); c) the working pressure or working pressure and temperature range; and d) the direction of flow (when necessary for correct installation). The following additional markings are recommended: — the type of fuel; — the electrical ratings (if applicable); — the symbol of the certification agency; — the type approval number; — the serial number or date code; and — a reference to this document. 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 injectors and gas mixing device/fuel rail shall comply with the applicable provisions of ISO 20766-1 and ISO 20766-2, and with the tests specified in Clause 6 . 6 Tests 6.1 Applicability The tests required to be carried out are indicated in Table 1.
6.4 Continued operation Subject the gas injector or fuel rail assembly to 600 × 10 pulses at working pressure and room temperature. This procedure may be interrupted at 20 % intervals in order to check test criteria. The minimum frequency for the pulses shall be 50 Hz. Upon completion of this test, the gas injector or fuel rail assembly shall pass the leakage test in accordance with ISO 20766-2:2018, Clause 6, and the insulation resistance test given in 6.4 . 6.5 Insulation resistance This test is designed for checking the insulation resistance between the connector pin and the housing. Apply a test voltage of 500 V d.c. for a duration of 60 s; for injectors with circuitry of 3,8 mm pitch or below, 100 V d.c. shall be used.