ISO 20766-12:2019
(Main)Road vehicles - Liquefied petroleum gas (LPG) fuel systems components - Part 12: Non-return valve
Road vehicles - Liquefied petroleum gas (LPG) fuel systems components - Part 12: Non-return valve
This document specifies general information regarding the non-return valve component of liquefied petroleum gas fuel, intended for use on the types of motor vehicles as defined in ISO 3833. It provides general design principles and specifies requirements for instructions and marking. It also specifies test requirements for the non-return valve. 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. NOTE 1 It is recognized that miscellaneous components not specifically addressed herein can be examined for compliance with the criteria of any applicable part of ISO 20766, including testing to the appropriate functional tests. NOTE 2 All references to pressure in this document are considered gauge pressures unless otherwise specified. NOTE 3 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).
Véhicules routiers — Équipements pour véhicules utilisant le gaz de pétrole liquéfié (GPL) comme combustible — Partie 12: clapet anti-retour
General Information
- Status
- Published
- Publication Date
- 10-Dec-2019
- Technical Committee
- ISO/TC 22/SC 41 - Specific aspects for gaseous fuels
- Current Stage
- 9093 - International Standard confirmed
- Start Date
- 07-Mar-2025
- Completion Date
- 13-Dec-2025
Relations
- Effective Date
- 06-Jun-2022
Overview
ISO 20766-12:2019 specifies requirements for the non‑return valve used in liquefied petroleum gas (LPG) fuel systems for road vehicles. It covers general design principles, marking and instruction requirements, and defined test procedures to verify safety and functional performance. The standard applies to mono‑fuel, bi‑fuel and dual‑fuel vehicles as defined in ISO 3833 and for gaseous fuels per ISO 9162. It is focused on vehicle components (not fuel containers, stationary engines, refuelling receptacles, electronic fuel management, or container mounting hardware).
Keywords: ISO 20766-12:2019, non-return valve, LPG fuel systems, liquefied petroleum gas, road vehicles
Key Topics
Scope & applicability
- Intended for non‑return valves in vehicle LPG systems; pressures are gauge pressures.
- Service pressure range covered: about 110 kPa (butane‑rich @20 °C) to 840 kPa (propane @20 °C); other pressures accommodated by proportional adjustment.
Marking & identification
- Required markings to enable traceability: manufacturer/agent name or logo, model/part number, working pressure (or pressure/temperature range).
- Recommended markings include flow direction, flow capacity, fuel type, electrical ratings (if applicable), certification symbol, approval number and serial/date code.
Construction & assembly
- Components must comply with ISO 20766‑1 (general requirements) and ISO 20766‑2 (performance/test methods).
Test requirements
- Hydrostatic strength: tested at 2.25 × working pressure.
- Leakage: verified at multiple temperatures and at pressures expressed as factors of the working pressure (including very low leak checks and higher pressure checks).
- Continued operation: endurance of 50,000 cycles plus 24 hours of chatter flow under specified conditions; subsequent re‑testing for leakage and hydrostatic strength is required.
- Additional applicable tests (where relevant) include corrosion, vibration, material compatibility, ageing and flow capacity per ISO 20766‑2.
Applications
- Manufacturers and designers of LPG non‑return valves use the standard to guide safe product design and labelling.
- OEM vehicle integrators and system suppliers rely on it for component selection, type approval and system safety verification.
- Test laboratories and regulatory bodies apply the specified procedures for conformity assessment, certification and quality control.
- Fleet operators and installers use the standard’s marking and documentation requirements for maintenance traceability.
Related Standards
- ISO 20766‑1 - General requirements and definitions for LPG fuel system components
- ISO 20766‑2 - Performance and general test methods (referenced for test procedures)
- ISO 3833 - Road vehicle types, terms and definitions
- ISO 9162 - Specifications for liquefied petroleum gases
ISO 20766‑12:2019 helps ensure robust, traceable and tested non‑return valves for safer LPG vehicle fuel systems.
Frequently Asked Questions
ISO 20766-12:2019 is a standard published by the International Organization for Standardization (ISO). Its full title is "Road vehicles - Liquefied petroleum gas (LPG) fuel systems components - Part 12: Non-return valve". This standard covers: This document specifies general information regarding the non-return valve component of liquefied petroleum gas fuel, intended for use on the types of motor vehicles as defined in ISO 3833. It provides general design principles and specifies requirements for instructions and marking. It also specifies test requirements for the non-return valve. 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. NOTE 1 It is recognized that miscellaneous components not specifically addressed herein can be examined for compliance with the criteria of any applicable part of ISO 20766, including testing to the appropriate functional tests. NOTE 2 All references to pressure in this document are considered gauge pressures unless otherwise specified. NOTE 3 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).
This document specifies general information regarding the non-return valve component of liquefied petroleum gas fuel, intended for use on the types of motor vehicles as defined in ISO 3833. It provides general design principles and specifies requirements for instructions and marking. It also specifies test requirements for the non-return valve. 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. NOTE 1 It is recognized that miscellaneous components not specifically addressed herein can be examined for compliance with the criteria of any applicable part of ISO 20766, including testing to the appropriate functional tests. NOTE 2 All references to pressure in this document are considered gauge pressures unless otherwise specified. NOTE 3 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).
ISO 20766-12:2019 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 20766-12:2019 has the following relationships with other standards: It is inter standard links to ISO 4766:2024. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase ISO 20766-12:2019 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of ISO standards.
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 20766-12
First edition
2019-12
Road vehicles — Liquefied petroleum
gas (LPG) fuel systems components —
Part 12:
Non-return valve
Véhicules routiers — Équipements pour véhicules utilisant le gaz de
pétrole liquéfié (GPL) comme combustible —
Partie 12: clapet anti-retour
Reference number
©
ISO 2019
© ISO 2019
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.
ISO copyright office
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Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Markings . 2
5 Construction and assembly . 2
6 Tests . 2
6.1 Applicability . 2
6.2 Hydrostatic strength . 3
6.3 Leakage . 3
6.4 Continued operation . 3
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
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
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 for gaseous fuels.
A list of all parts in the ISO 20766 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 2019 – All rights reserved
INTERNATIONAL STANDARD ISO 20766-12:2019(E)
Road vehicles — Liquefied petroleum gas (LPG) fuel
systems components —
Part 12:
Non-return valve
1 Scope
This document speci
...
ISO 20766-12:2019 문서는 액화 석유 가스(LPG) 연료 시스템의 비회귀 밸브 구성 요소에 대한 표준으로서, 모터 차량에 관한 ISO 3833의 정의에 따른 다양한 차량에 적용됩니다. 이 표준은 비회귀 밸브의 일반 설계 원칙과 요구 사항을 규명하고, 설치 및 마킹에 대한 지침을 제시합니다. 또한 비회귀 밸브에 대한 테스트 요구 사항을 상세히 설명하고 있어, 사용자의 안전과 차량의 성능을 보장하는 데 중요한 역할을 합니다. 본 표준의 강점은 명확한 요구 사항과 다양한 적용 가능성을 제공한다는 점입니다. 단일 연료, 이중 연료 또는 복합 연료로 작동하는 차량에 대한 적용성을 고려하여 설계된 비회귀 밸브의 특성은 LPG 연료 시스템에서의 안전성과 효율성을 극대화하는 데 기여합니다. 특히, 이 문서는 비회귀 밸브의 작동 압력이 110kPa에서 840kPa 범위임을 명시하고 있어, 사용자가 해당 밸브의 적절한 사용 조건을 쉽게 이해하고 적용할 수 있도록 돕습니다. ISO 20766-12:2019의 중요성은 설계와 안전에 관한 표준들을 제공하며, 액화 석유 가스의 효율적인 사용을 위한 기반을 제공하는 데 있습니다. 이 문서의 규정은 차량 제조업체 및 서비스 제공자가 LPG 연료 시스템의 구성 요소를 설계하고 인증하는 데 필수적이며, 이로 인해 궁극적으로 소비자에게 더 안전한 차량을 제공합니다. 따라서, 이 문서는 액화 석유 가스 연료 시스템의 성능과 안전을 보장하기 위한 필수 참고자료로 자리잡고 있습니다.
Die ISO 20766-12:2019 ist ein bedeutendes Dokument, das sich auf die Komponenten von Flüssiggasbetriebsystemen in Straßenfahrzeugen konzentriert, insbesondere auf das Rückschlagventil. Der Umfang dieser Norm ist klar definiert und richtet sich an Motorfahrzeuge, wie sie in der ISO 3833 beschrieben sind. Sie legt die allgemeinen Designprinzipien fest und spezifiziert Anforderungen bezüglich der Anweisungen und Kennzeichnungen für das Rückschlagventil. Darüber hinaus definiert die Norm die Prüfanforderungen, die für diese wichtige Komponente notwendig sind. Ein herausragendes Merkmal der ISO 20766-12:2019 ist ihre Anwendbarkeit auf verschiedene Fahrzeugtypen, darunter Mono-Brennstoff-, Bi-Brennstoff- und Dual-Brennstoff-Anwendungen, die gemäß ISO 9162 mit gasförmigen Kraftstoffen betrieben werden. Dies zeigt den integrativen Ansatz der Norm, der es ermöglicht, verschiedene Fahrzeugtechnologien abzudecken und somit die Flexibilität im Einsatz von LPG-Systemen zu erhöhen. Die Stärken dieser Norm liegen in ihrer detaillierten Ausarbeitung der Anforderungen, die sicherstellen, dass das Rückschlagventil sowohl sicher als auch effizient funktioniert. Die explizite Erwähnung von Testanforderungen gibt den Herstellern klare Richtlinien zur Überprüfung der Leistungsfähigkeit ihrer Produkte und steigert dadurch die Gesamtsicherheit von Flüssiggasbetriebsystemen in Fahrzeugen. Die Relevanz der ISO 20766-12:2019 kann nicht übersehen werden, da sie wesentliche Vorgaben für die Konstruktion von Rückschlagventilen liefert und somit einen Beitrag zur allgemeinen Sicherheit und Funktionalität von LPG-Kraftfahrzeugen leistet. Indem die Norm umfassende Informationen bereitstellt und den Rahmen für Prüfungen und Kennzeichnungen festlegt, stärkt sie das Vertrauen in die Verwendung von Flüssiggas als Energiequelle in der Automobilindustrie. Hinweisenswert ist auch die Flexibilität der Norm bei der Anpassung an verschiedene Betriebsdrücke, wodurch sie auf ein breites Spektrum von Anwendungen anwendbar ist. Insgesamt stellt die ISO 20766-12:2019 eine wichtige Ressource dar, die sowohl Herstellern als auch Endbenutzern von Flüssiggasfahrzeugen wertvolle Informationen und Standards bietet, um die Sicherheit und Effizienz der Systeme zu gewährleisten.
ISO 20766-12:2019は、道路車両に使用される液化石油ガス（LPG）燃料システムコンポーネントに関する重要な標準で、特に非復帰弁に焦点を当てています。この標準は、ISO 3833で定義されたタイプの自動車に対して適用されるものであり、設計原則、指示およびマーキングの要件を明確に示しています。そのため、エンジニアや設計者は、LPG燃料システムの安全性と信頼性を確保するための基準を理解し、適切に遵守することが求められます。 この文書は、モノ燃料、二燃料、またはデュアル燃料アプリケーションに使用されるガス燃料を利用する車両に適用され、非復帰弁の試験要件を詳細に規定しています。特に、サービス圧力範囲が110 kPaから840 kPaであるデバイスに関連する情報が提供されているため、実務での適用性が高いと言えます。これは、実際の運用条件を考慮した設計が促進されることを意味しています。 ISO 20766-12:2019は、ガス圧力に関する記載がゲージ圧力として理解される点も明確に述べており、技術者が誤解なく適用できる助けとなるでしょう。このように、特定のコンポーネントに関する詳細を提供することで、車両の安全性向上に向けた効果的なガイドラインを示しています。 また、文書では、燃料容器や固定式ガスエンジン、電子燃料管理、および給油受領器などの非適用品目についても明記されており、ユーザーが関連する範囲を明確に理解できるようになっています。ISO 20766-12:2019は、液化石油ガス燃料システムにおける非復帰弁の設計と使用に関する指針を提供することで、業界における標準化の重要性を示しています。最終的に、これは自動車産業の安全性と効率を向上させる役割を果たしています。
La norme ISO 20766-12:2019 se concentre sur les composants des systèmes de carburant au gaz de pétrole liquéfié (GPL) dans les véhicules routiers, en mettant l'accent sur la vanne de non-retour. Son champ d'application est clairement défini, stipulant que ce document est destiné aux véhicules motorisés tels que définis dans la norme ISO 3833, qu'ils soient mono-carburant, bi-carburant ou à double carburant. Les forces de cette norme résident dans ses principes de conception généraux et dans les exigences spécifiques qu'elle fournit concernant les instructions et le marquage. Cela renforce la compréhension et l'utilisation correcte des vannes de non-retour dans les systèmes GPL, garantissant ainsi la sécurité et l'efficacité des véhicules utilisant ce type de carburant. Les exigences de test pour la vanne de non-retour sont également clairement spécifiées, ce qui contribue à garantir la fiabilité de ces composants essentiels. La pertinence de l'ISO 20766-12:2019 est indéniable, car elle permet de standardiser l’utilisation des vannes de non-retour dans les applications de GPL. De plus, elle s'inscrit dans une approche plus large d'harmonisation des normes pour les véhicules au gaz, en facilitant la conformité et la certification auprès des fabricants et utilisateurs de systèmes de carburant GPL. Enfin, ce document prend également en compte divers dispositifs de pression de service, ce qui lui confère une flexibilité supplémentaire pour s’adapter à différentes configurations de véhicules. En résumé, l'ISO 20766-12:2019 offre un cadre exhaustif et adapté qui améliore la sécurité, l’efficacité et la standardisation des systèmes GPL dans le secteur automobile, renforçant ainsi sa pertinence dans le domaine des normes techniques pour les véhicules.
The ISO 20766-12:2019 standard provides a comprehensive framework for the non-return valve component used in liquefied petroleum gas (LPG) fuel systems in road vehicles. This document emphasizes the importance of standardized design principles and specific requirements for instructions and marking, ensuring the safety and efficiency of LPG fuel systems. One of the strengths of this standard is its clarity in defining the scope of application. It specifically caters to motor vehicles as outlined in ISO 3833 and is relevant for various fuel applications, including mono-fuel, bi-fuel, or dual-fuel configurations. This wide applicability demonstrates its significance in the automotive industry, where flexibility in fuel types is increasingly common. The specification of test requirements for the non-return valve under ISO 20766-12:2019 stands out as a crucial aspect. By establishing rigorous testing protocols, the standard ensures that the non-return valves meet necessary safety and operational performance benchmarks. This is particularly vital given the critical role these valves play in the proper functioning of LPG systems, which require precise pressure management, as indicated by the specified service pressure range of 110 kPa to 840 kPa. Moreover, the standard provides room for the examination of other miscellaneous components for compliance, which showcases its adaptability. This inclusion allows for a more holistic approach to the overall LPG fuel system integrity, ensuring all components can be evaluated against established criteria. The detailed marking and instruction requirements further reinforce the user's ability to understand the non-return valve's correct installation and operational safety, enhancing the user experience and compliance with regulatory demands. Overall, the ISO 20766-12:2019 standard is highly relevant in today's evolving automotive landscape, providing essential guidelines that promote safety, facilitate multi-fuel compatibility, and ensure reliable performance of LPG fuel systems in vehicles. Its strengths lie in its detailed scope, comprehensive testing protocols, and adaptability to various fuel management scenarios.
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