ISO 12614-3:2021
(Main)Road vehicles - Liquefied natural gas (LNG) fuel system components - Part 3: Check valve
Road vehicles - Liquefied natural gas (LNG) fuel system components - Part 3: Check valve
This document specifies tests and requirements for the check 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, 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 3: Valve de contrôle
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 12614-3:2021 - Road vehicles - Liquefied natural gas (LNG) fuel system components - Part 3: Check valve specifies tests and requirements for check valves used in LNG fuel systems for road vehicles (as defined in ISO 3833). The standard defines marking, construction/assembly expectations and the specific functional tests (hydrostatic strength, leakage, continued operation) required to verify safe, reliable check valve performance for LNG applications. All pressures are gauge pressures and the document is based on a nominal working pressure (WP) of 1.6 MPa (16 bar); other WPs are accommodated by applying a ratio (for example, 2.0 MPa requires a 1.25 multiplier).
Key Topics and Requirements
- Marking and traceability
- Mandatory: manufacturer name/trademark, model/part number, working pressure or pressure–temperature range, serial number or date code.
- Recommended: flow direction, fuel type, electrical ratings (if applicable), certification symbol, type approval number, reference to ISO 12614-3.
- Construction and assembly
- Check valves must meet the general requirements of ISO 12614-1 and test methods of ISO 12614-2.
- Test program (applicability)
- Test types referenced from ISO 12614-2 include hydrostatic strength, leakage, continued operation, corrosion resistance, vibration, brass compatibility, non‑metallic immersion and others; some tests (e.g., electrical over-voltages) are not applicable for many check valves.
- Hydrostatic strength
- Test pressure = 2.5 × working pressure (WP).
- Leakage
- Leakage tests are specified at multiple temperatures and pressure factors (see standard Table 2): e.g., at <−162 °C use 1.0 × WP and 0.25 × WP; at 20 °C use 0.25 × WP and 1.5 × WP; at 85 or 120 °C use 0.25 × WP.
- Continued operation
- Check valves must withstand 7,000 cycles under a specified pressure cycling procedure (inlet at 1.25 × WP, venting to 0–0.5 × test pressure between cycles). Valve must function and pass the hydrostatic test afterwards.
Applications and Who Uses It
- Primary users
- Vehicle OEMs, LNG fuel system designers, component manufacturers, test laboratories, certification bodies, fleet operators and procurement specialists.
- Practical uses
- Design validation, production quality control, type approval and certification, supplier qualification, and contract/specification writing for LNG check valves in road vehicles.
Related Standards
- ISO 12614-1 - General requirements and definitions for LNG fuel system components
- ISO 12614-2 - Performance and general test methods for LNG fuel system components
- ISO 3833 - Road vehicles - Types - Terms and definitions
Keywords: ISO 12614-3:2021, LNG check valve, liquefied natural gas fuel system, check valve testing, hydrostatic strength, leakage test, continued operation, road vehicles.
Frequently Asked Questions
ISO 12614-3:2021 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 3: Check valve". This standard covers: This document specifies tests and requirements for the check 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, 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 check 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, 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 12614-3:2021 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 12614-3:2021 has the following relationships with other standards: It is inter standard links to ISO 12614-3:2014. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ISO 12614-3:2021 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 12614-3
Second edition
2021-06
Road vehicles — Liquefied natural gas
(LNG) fuel system components —
Part 3:
Check valve
Véhicules routiers — Équipements pour véhicules utilisant le gaz
naturel liquéfié (GNL) comme combustible —
Partie 3: Valve de contrôle
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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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 12614-3:2014), which has been technically
revised.
The main changes comp
...
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