ISO 12614-4:2021
(Main)Road vehicles - Liquefied natural gas (LNG) fuel system components - Part 4: Manual valve
Road vehicles - Liquefied natural gas (LNG) fuel system components - Part 4: Manual valve
This document specifies tests and requirements for the manual valve, a liquefied natural gas fuel system component intended for use on the types of motor vehicles defined in ISO 3833. This document 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 to be 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, a 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 — Équipements pour véhicules utilisant le gaz naturel liquéfié (GNL) comme combustible — Partie 4: Valve manuelle
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 12614-4:2021 is an international standard published by the International Organization for Standardization (ISO) that defines the requirements and test methods for manual valves used in liquefied natural gas (LNG) fuel systems on road vehicles. This standard targets LNG fuel system components specifically designed for motor vehicles classified under ISO 3833. It ensures the safety, performance, and reliability of manual valves in automotive LNG applications by establishing consistent technical criteria for design, construction, marking, and testing.
The document excludes components such as fuel containers, stationary gas engines, container mounting hardware, electronic fuel management systems, and refuelling receptacles. It focuses exclusively on manual valves, which are critical for controlling LNG flow safely at working pressures typically around 1.6 MPa (16 bar), with provisions for higher pressure systems.
Key Topics
Scope of Application
Manual valves for LNG fuel systems on road vehicles as defined in ISO 3833, excluding certain other components and assemblies.Marking Requirements
Essential marking information includes manufacturer details, model or part number, and working pressure or pressure-temperature range. Recommended markings consist of flow direction, fuel type, certification symbols, approval numbers, serial codes, and the ISO 12614-4 reference for traceability.Construction and Assembly
Manual valves must comply with the general requirements and test methods outlined in related parts ISO 12614-1 and ISO 12614-2. The standard emphasizes robust construction to withstand high pressures and harsh operating conditions.Testing Protocols
The standard mandates multiple performance and safety tests including:- Hydrostatic strength: Testing valves at 2.5 times the rated working pressure to validate structural integrity.
- Leakage: Verification under various temperature and pressure conditions, simulating operational extremes.
- Continued operation: Cycling the valve 100 times under pressure to ensure durable mechanical function without increased torque or leakage.
- Additional tests address excess torque resistance, bending moment, corrosion resistance, vibration, and material compatibility when applicable.
Torque Specifications
Maximum permissible torque values are provided by valve inlet size and test temperature, ensuring manual operation remains safe and effective throughout the valve lifecycle.
Applications
ISO 12614-4:2021 manual valves are essential components in LNG-powered vehicles, including buses, trucks, and other commercial transport fitting liquefied natural gas fuel systems. These valves enable safe manual control of LNG flow for operational management and emergency situations.
Key practical benefits include:
- Ensuring fuel system safety through rigorous pressure and leakage testing.
- Providing standardized performance benchmarks supporting global vehicle manufacturing and maintenance.
- Facilitating reliable manual control of LNG flow under various environmental conditions, including cryogenic temperatures.
- Enhancing traceability and certification confidence via clear marking and documentation requirements.
Adhering to this standard enables manufacturers and service providers to deliver compliant, safe, and durable LNG fuel system components aligned with modern sustainable transportation initiatives.
Related Standards
- ISO 12614-1: General requirements and definitions for LNG fuel system components.
- ISO 12614-2: Performance criteria and general test methods for LNG fuel system components, referenced heavily in Part 4's testing procedures.
- ISO 3833: Vehicle type definitions that classify the types of motor vehicles for which LNG fuel system components like manual valves are intended.
Together, ISO 12614 series and related ISO road vehicle standards provide a comprehensive framework supporting the development, testing, and deployment of LNG fuel system technologies for improved environmental performance and safety in road transport.
For more information, visit the official ISO website at www.iso.org and search for ISO 12614-4:2021. Adhering to these international standards is key to ensuring that LNG fuel system components meet stringent safety and quality benchmarks in the rapidly evolving alternative fuel vehicle industry.
Frequently Asked Questions
ISO 12614-4:2021 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 4: Manual valve". This standard covers: This document specifies tests and requirements for the manual valve, a liquefied natural gas fuel system component intended for use on the types of motor vehicles defined in ISO 3833. This document 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 to be 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, a 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 manual valve, a liquefied natural gas fuel system component intended for use on the types of motor vehicles defined in ISO 3833. This document 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 to be 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, a 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 12614-4:2021 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 12614-4:2021 has the following relationships with other standards: It is inter standard links to ISO 12614-4:2014. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ISO 12614-4:2021 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 12614-4
Second edition
2021-06
Road vehicles — Liquefied natural gas
(LNG) fuel system components —
Part 4:
Manual valve
Véhicules routiers — Équipements pour véhicules utilisant le gaz
naturel liquéfié (GNL) comme combustible —
Partie 4: Valve manuelle
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
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
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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
Bibliography . 4
Foreword
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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 12614-4:2014), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— editorial changes.
A list of all parts in the ISO 12614 series can be found on the ISO website.
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