Overview
ISO 12619-4:2016 - Road vehicles - Compressed gaseous hydrogen (CGH2) and hydrogen/natural gas blends fuel system components - Part 4: Check valve specifies requirements, design principles, marking and test methods for check valves used in CGH2 and hydrogen/natural gas blend fuel systems for road vehicles (as defined in ISO 3833). The standard applies to systems using CGH2 (ISO 14687‑1 / ISO 14687‑2) and hydrogen/natural gas blends (ISO 15403‑1 / ISO/TR 15403‑2) and excludes liquefied hydrogen upstream components, fuel containers, refuelling receptacles and several other items.
Key topics and technical requirements
- Scope & applicability: Focused on check valves for compressed gaseous hydrogen and H2/NG blends in motor vehicles; explicitly excludes LH2 components upstream of the vaporizer, fuel containers, stationary engines, container mounting hardware, electronic fuel management and refuelling receptacles.
- Marking: Components must carry traceable identification such as manufacturer, part/model number, working pressure or pressure/temperature range. Recommended markings include flow direction, fuel type, electrical ratings, certification symbols, serial/date code and reference to ISO 12619. Markings must be permanent and legible for the component life.
- Construction & assembly: Check valves must comply with the general provisions of ISO 12619‑1 and the performance/test interface with ISO 12619‑2.
- Tests and performance:
- Hydrostatic strength: test per ISO 12619‑2 at 2× working pressure.
- Leakage: leakage tests at specified temperatures and pressures (e.g., low and high temperature conditions, and defined fractions of working pressure).
- Continued operation: endurance of 20 000 cycles plus 24 hours of chatter flow; post-test compliance with leakage and hydrostatic tests is required.
- A broader suite of tests (corrosion, vibration, material compatibility, ageing, electrical/thermal exposures) is referenced via ISO 12619‑2 and related parts.
Applications and users
ISO 12619-4 is intended for:
- Automotive OEMs and hydrogen vehicle system integrators specifying or validating check valves for CGH2 and H2/NG blend fuel systems.
- Component manufacturers designing valves to meet hydrogen-specific safety, durability and marking requirements.
- Test laboratories and certification bodies performing hydrostatic, leakage and endurance testing.
- Safety engineers, regulators and procurement teams assessing component compliance for hydrogen-powered road vehicles.
Practical benefits include improved interoperability, traceability, predictable performance under hydrogen service conditions, and alignment with vehicle safety and type-approval processes.
Related standards
Keywords: ISO 12619-4, check valve, compressed gaseous hydrogen (CGH2), hydrogen/natural gas blends, fuel system components, road vehicles, hydrogen valve testing.