ISO 12614-19:2021
(Main)Road vehicles - Liquefied natural gas (LNG) fuel system components - Part 19: Automatic valve
Road vehicles - Liquefied natural gas (LNG) fuel system components - Part 19: Automatic valve
This document specifies tests and requirements for the automatic valve, a liquefied natural gas fuel system component intended for use on the types of motor vehicles defined in ISO 3833. This document is applicable to vehicles using natural gas in accordance with ISO 15403-1 (mono-fuel, bi-fuel or dual-fuel applications). 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 covered herein can be examined to meet the criteria of this document and tested according to the appropriate functional tests. All references to pressure in this document are considered gauge pressures unless otherwise specified. This document is based upon a working pressure for natural gas as a fuel of 1,6 MPa [16 bar1]. Other working pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio). For example, 2 MPa (20 bar) working pressure system will require pressures to be multiplied by 1,25. 1 1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm2.
Véhicules routiers — Composants des systèmes d'alimentation en gaz naturel liquéfié (GNL) — Partie 19: Valve automatique
General Information
- Status
- Published
- Publication Date
- 03-Jun-2021
- Technical Committee
- ISO/TC 22/SC 41 - Specific aspects for gaseous fuels
- Current Stage
- 6060 - International Standard published
- Start Date
- 04-Jun-2021
- Due Date
- 08-Jan-2022
- Completion Date
- 04-Jun-2021
Relations
- Effective Date
- 23-Apr-2020
Overview
ISO 12614-19:2021 defines tests and requirements for the automatic valve used in liquefied natural gas (LNG) fuel systems for road vehicles. Applicable to mono‑fuel, bi‑fuel and dual‑fuel vehicles (as per ISO 15403-1 and vehicle types in ISO 3833), this part of the ISO 12614 series focuses on functional safety, durability and electrical integrity of LNG automatic valves. It excludes fuel containers, stationary engines, mounting hardware, electronic fuel management and refuelling receptacles.
Keywords: ISO 12614-19, LNG automatic valve, liquefied natural gas fuel system components, LNG valve testing, road vehicles.
Key topics and technical requirements
- Marking and traceability
- Manufacturer/agent name, model/part number, working pressure or pressure/temperature range, serial number or date code.
- Recommended: flow direction, fuel type, electrical ratings, certification symbol, type approval number, reference to ISO 12614-19.
- Special marks for start/stop compatibility: H1, H2, H3.
- Construction
- Valve shall be closed when de‑energized. Manual bypass designs must meet the same minimum requirements.
- Mechanical and leakage testing
- Tests referenced to ISO 12614-2 procedures.
- Hydrostatic strength: test at 2.5 × working pressure (WP).
- Leakage tests at multiple temperatures with pressures scaled to WP (examples from Table 2):
- ≤ −60 °C: test at 1.0 × WP and 0.25 × WP.
- 20 °C and 85 °C/120 °C: test at 0.25 × WP and 1.5 × WP.
- Endurance (continued operation)
- Standard cycling: 7,000 cycles plus leakage/strength re‑checks.
- For start‑stop applications: H1 = 200,000, H2 = 500,000, H3 = 1,000,000 cycles depending on functionality.
- Electrical requirements
- Insulation resistance: apply 500 V DC for 60 s (100 V DC for certain small‑pitch sensors); minimum 240 kΩ.
- Minimum opening voltage: must operate at 9 V (12 V systems) or 18 V (24 V systems) at room temperature while pressurized to 0.75 × WP (0.5 × WP for pilot‑operated valves).
- Working pressure baseline
- Standard WP = 1.6 MPa (16 bar). Other WPs accommodated by proportional scaling (e.g., 2.0 MPa = multiply by 1.25).
Applications and users
- Vehicle OEMs and powertrain engineers specifying LNG fuel systems.
- Valve and component manufacturers seeking compliance and type approval.
- Test laboratories performing hydrostatic, leakage, endurance and electrical tests.
- Certification bodies, safety engineers and regulators evaluating LNG fuel system safety. Practical benefits include improved safety, predictable durability for start/stop vehicles, and consistent repeatable test methods.
Related standards
- ISO 12614-1: General requirements and definitions (LNG components)
- ISO 12614-2: Performance and general test methods
- ISO 3833: Vehicle types - terms and definitions
- ISO 15403-1: Natural gas quality for vehicle fuel
Compliance with ISO 12614-19 helps ensure LNG automatic valves meet internationally recognized safety, durability and electrical integrity benchmarks for automotive applications.
Frequently Asked Questions
ISO 12614-19:2021 is a standard published by the International Organization for Standardization (ISO). Its full title is "Road vehicles - Liquefied natural gas (LNG) fuel system components - Part 19: Automatic valve". This standard covers: This document specifies tests and requirements for the automatic valve, a liquefied natural gas fuel system component intended for use on the types of motor vehicles defined in ISO 3833. This document is applicable to vehicles using natural gas in accordance with ISO 15403-1 (mono-fuel, bi-fuel or dual-fuel applications). 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 covered herein can be examined to meet the criteria of this document and tested according to the appropriate functional tests. All references to pressure in this document are considered gauge pressures unless otherwise specified. This document is based upon a working pressure for natural gas as a fuel of 1,6 MPa [16 bar1]. Other working pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio). For example, 2 MPa (20 bar) working pressure system will require pressures to be multiplied by 1,25. 1 1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm2.
This document specifies tests and requirements for the automatic valve, a liquefied natural gas fuel system component intended for use on the types of motor vehicles defined in ISO 3833. This document is applicable to vehicles using natural gas in accordance with ISO 15403-1 (mono-fuel, bi-fuel or dual-fuel applications). 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 covered herein can be examined to meet the criteria of this document and tested according to the appropriate functional tests. All references to pressure in this document are considered gauge pressures unless otherwise specified. This document is based upon a working pressure for natural gas as a fuel of 1,6 MPa [16 bar1]. Other working pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio). For example, 2 MPa (20 bar) working pressure system will require pressures to be multiplied by 1,25. 1 1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm2.
ISO 12614-19:2021 is classified under the following ICS (International Classification for Standards) categories: 43.060.40 - Fuel systems. The ICS classification helps identify the subject area and facilitates finding related standards.
ISO 12614-19:2021 has the following relationships with other standards: It is inter standard links to ISO 12614-19:2017. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ISO 12614-19:2021 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 12614-19
Second edition
2021-06
Road vehicles — Liquefied natural gas
(LNG) fuel system components —
Part 19:
Automatic valve
Véhicules routiers — Composants des systèmes d'alimentation en gaz
naturel liquéfié (GNL) —
Partie 19: Valve automatique
Reference number
©
ISO 2021
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
ii © ISO 2021 – All rights reserved
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 strength . 3
6.3 Leakage . 3
6.4 Continued operation . 3
6.5 Insulation resistance . 4
6.6 Minimum opening voltage . 4
Bibliography . 5
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 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 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 for 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
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on the ISO list of patent declarations received (see www .iso .org/ patents).
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expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 41,
Specific aspects of gaseous fuels.
This second edition cancels and replaces the first edition (ISO 12614-19:2017), which has been
technically revised.
The main changes compared to the previous edition are as follows:
— editorial changes;
— requirements the insulation resistance (6.5) and minimum opening voltage (6.6).
A list of all parts in the ISO 12614 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2021 – All rights reserved
INTERNATIONAL STANDARD ISO 12614-19:2021(E)
Road vehicles — Liquefied natural gas (LNG) fuel system
components —
Part 19:
Automatic valve
1 Scope
This document specifies tests and requirements for the automatic valve, a liquefied natural gas fuel
system component intended for use on the types of motor vehicles defined in ISO 3833. This documen
...
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