ISO 12619-11-2017 PDF

Full title and description

St ISO 12619-11-2017 — Road vehicles — Compressed gaseous hydrogen (CGH2) and hydrogen/natural gas blends fuel system components — Part 11: Excess flow valve. This part of ISO 12619 specifies tests and requirements for excess flow valves intended for use in CGH2 and hydrogen/natural gas blend vehicle fuel systems, and defines applicability and exclusions for these components.

Abstract

ISO 12619-11:2017 sets out functional tests and performance requirements for the excess flow valve (EFV) used in compressed gaseous hydrogen (CGH2) and hydrogen/natural gas blend fuel systems on motor vehicles. It establishes the expected behaviour of the EFV (for example flow interruption in the event of a downstream line break), applicable test conditions and limits, and notes exclusions such as liquefied hydrogen systems and fuel containers. References to pressure in the standard are gauge pressures unless otherwise indicated.

General information

• Status: Published (confirmed at review 2023).
• Publication date: August 2017.
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 43.060.40 (Fuel systems).
• Edition / version: Edition 1 (2017).
• Number of pages: 6 pages.

Scope

ISO 12619-11:2017 is applicable to excess flow valves used on the types of motor vehicles defined in ISO 3833 where compressed gaseous hydrogen (CGH2) or hydrogen/natural gas blends are used (CGH2 in accordance with ISO 14687‑1/‑2; natural gas in accordance with ISO 15403‑1 and ISO/TR 15403‑2). The standard is not applicable to liquefied hydrogen (LH2) fuel system components, fuel containers, stationary gas engines, container mounting hardware, electronic fuel management, refuelling receptacles or fuel cell vehicles. It allows that miscellaneous components not explicitly covered can be assessed against the criteria and appropriate functional tests of this document.

Key topics and requirements

• Definition and intended function of the excess flow valve (EFV) in CGH2 and hydrogen/natural gas blend vehicle fuel systems.
• Functional tests simulating line-break and over‑flow conditions to verify prompt flow interruption and acceptable leakage limits.
• Performance requirements across specified pressure ranges (references are gauge pressures) and temperature/environmental conditions representative of vehicle service.
• Material compatibility and suitability for use with hydrogen and hydrogen/blend fuels, including durability and cycling/endurance considerations.
• Marking, instructions and identification requirements aligned with the general principles in ISO 12619‑1 (general requirements and definitions).

Typical use and users

Primary users are vehicle manufacturers, fuel system component designers and suppliers (EFV manufacturers), test laboratories and conformity assessment bodies, and regulatory or certification authorities involved with hydrogen-fuelled and dual-fuel vehicle systems. The standard is used during component design, validation testing, type-approval activities and supplier qualification for on-vehicle fuel system components.

Related standards

ISO 12619-11 is part of the ISO 12619 series covering CGH2 and hydrogen/natural gas blend fuel system components; related parts include ISO 12619‑1 (general requirements and definitions) and other part documents addressing specific components such as automatic valves, pressure relief devices, pressure indicators and filters. For system-level context, references include ISO 3833 (vehicle type definitions), ISO 14687 (hydrogen fuel quality) and ISO 15403 (natural gas fuel quality).

Keywords

excess flow valve; EFV; CGH2; hydrogen/natural gas blend; vehicle fuel system; fuel system components; hydrogen fuel; performance testing; ISO 12619.

FAQ

Q: What is this standard?

A: ISO 12619-11:2017 specifies tests and performance requirements for excess flow valves used in compressed gaseous hydrogen and hydrogen/natural gas blend vehicle fuel systems (EFVs are safety-oriented devices intended to limit flow after a line break or major leak).

Q: What does it cover?

A: It covers functional testing, performance limits (including acceptable leakage and shut‑off behaviour), applicable pressure/temperature conditions (gauge pressures), and marking/instruction expectations for the EFV. It also lists equipment and system types to which it does not apply (for example LH2 systems and fuel containers).

Q: Who typically uses it?

A: Vehicle OEMs, EFV and fuel‑system suppliers, independent test laboratories, certification bodies and regulators involved with gaseous hydrogen or hydrogen/blend vehicle fuel systems.

Q: Is it current or superseded?

A: ISO 12619-11:2017 is the published first edition (2017) and, according to the ISO records, was reviewed and confirmed (remains current) at the most recent ISO review cycle. Users should verify the ISO catalogue or national standards body for any subsequent amendments or newer editions before relying on the document for certification or regulatory purposes.

Q: Is it part of a series?

A: Yes — it is one part of the ISO 12619 series that defines requirements for various CGH2 and hydrogen/natural gas blend fuel system components; ISO 12619‑1 provides general requirements and definitions while other numbered parts address different component types (valves, pressure devices, indicators, filters, lines, etc.).

Q: What are the key keywords?

A: Excess flow valve, EFV, hydrogen vehicle, CGH2, hydrogen/natural gas blend, fuel system component, performance test, ISO 12619.