Hydrogen is the lightest and smallest molecule. It is widely-know to its role in the transition to a more sustainable and cleaner industry, making it vital in sectors like mobility, energy, and chemicals. Green hydrogen, a promising alternative to fossil fuels, can be made through the process of water electrolysis.
However, hydrogen is still a gas and requires specialized equipment for safe handling, as it is highly flammable and reactive. With this, high-pressure ball valves that are hydrogen-resistant are essential to ensure safe gas handling in industrial settings.
Standard valves often fail when exposed to high-pressure hydrogen over time. The metal becomes brittle and loses its ability to deform under stress, resulting in unpredictable cracking. This guide helps you choose the right alloy to ensure long-term safety and prevent costly shutdowns.
How High-Pressure Ball Valves Prevent Hydrogen Embrittlement?
Hydrogen embrittlement occurs when the ductility and load-bearing capacity of metals decrease. This is caused by the absorption of atomic hydrogen during manufacturing, plating, welding, or corrosion. The atoms of hydrogen diffuse into the metal lattice, creating internal pressure and making cracks easier to start and grow.
The risk increases significantly in high-pressure applications above 350 bar as it forces more hydrogen atoms into the material surface. Stress from mechanical loads also speeds up the cracking process. Even a small surface scratch can become a starting point for a fracture.
Materials under constant tension are most vulnerable to this phenomenon. The metal may look perfect on the outside while failing internally, then the valve snaps or bursts during standard operations without any warning. This makes hydrogen service one of the most demanding fields for trunnion ball valve manufacturers.
Top Materials for High-Pressure Hydrogen Ball Valves
Austenitic stainless steels are the gold standard for hydrogen resistance, with grade 316/316L being the preferred choice. To ensure long-term stability and prevent hydrogen-induced phase transformation, it is a critical industry requirement to maintain a Nickel (Ni) content of at least 12%. This high nickel concentration stabilizes the austenite phase, which significantly resists hydrogen diffusion and embrittlement, even under extreme pressure. These stainless steel ball valves maintain their ductility even at cryogenic temperatures.
Specialty alloys like XM-19 or Inconel 718 are used for high-stress parts. These offer higher yield strength than standard 316L stainless steel, often used for valve stems and internal springs. Using these alloys ensures the valve remains operable under extreme pressure cycles.
Properties of Hydrogen-Resistant Ball Valves
These ball valves are made to safely control the flow of hydrogen gas. They also often include unique seals and gaskets that minimize leakages, an essential attribute given that hydrogen is a volatile gas. The following are the specific requirements for ball valves to withstand hydrogen properties:
Corrosion-Resistant Materials
- Hydrogen can react negatively with certain materials, resulting in embrittlement or weakened materials. For this very reason, ball valves must be made of highly corrosion-resistant materials.
Hermetic Sealing
- As hydrogen is an extremely small molecule, the risk of leakage increases if the sealing is not enough and inefficient. Hence, these valves should have advanced sealing systems, such as special gaskets and packing, to ensure a tight seal and reduce the chances of leaks. Avoid non-metallic seals with high hydrogen permeability to reduce leakage risk.
Robust and Efficient Design
- Choose valve body and sealing materials based on operating pressure, temperature, and hydrogen compatibility. Ball valves for hydrogen systems must withstand high pressure and temperature. For pipelines with pressure ≥2.5 MPa, use secure flange sealing (concave–convex, tongue-and-groove, ring joint) or butt-weld connections.
Stringent Safety Testing
- Taking into account the risk of explosion associated with hydrogen leaks, ball valves must undergo stringent testing to validate their ability to safely handle the gas. Moreover, this ensures reliability in volatile and critical settings, like gas transport.
- The following standards are widely used for the design, manufacture, inspection, and valve testing in hydrogen systems:
- ISO 19880-3:2018: “Gaseous hydrogen—Fuelling stations—Part 3: Valves.”
- ASME B31.12: “Hydrogen Piping and Pipelines”
- ISO 14687: “Hydrogen fuel quality—Product specification.”
- EN 13643: “Cryogenic vessels—Safety devices for protection against excessive pressure.”
- API 600: “Steel Gate Valves—Flanged and Butt-welding Ends, Bolted Bonnets”
- GB/T 34542: “General Technical Specifications for Equipment Used in Hydrogen Fueling Stations”
Onero Valve’s Manufacturing Process for Hydrogen Safety
Onero Valve combines advanced in-house R&D with stringent quality controls and precision manufacturing to produce valves that can withstand harsh applications like hydrogen service.
Our process begins with material selection guided by decades of experience and testing capabilities, such as cryogenic and leak detection systems. We ensure nickel content in stainless steel stays above 12% for better stability. This precision prevents the formation of phases that attract hydrogen atoms.
High-quality raw materials are sourced and inspected before being machined on CNC equipment and robots to achieve precise dimensions. Our valves also undergo strict inspections (hardness, pressure, dimensional, and leak testing) to confirm performance and safety. The result is a range of engineered products—such as trunnion ball valves.
Conclusion
Hydrogen embrittlement is a serious threat to the safety of gas infrastructure. High-pressure systems require materials that can resist atomic penetration and internal cracking. A proper understanding of the technicalities and material science ensures that high-pressure ball valves operate safely for years.
Onero Valve provides specialized solutions for the hydrogen energy sector. For 38 years, we have specialized in ball valve R&D, achieving 8 patents and over 30 models with nearly 1,000 specifications while integrating advanced global technologies.
At Onero, we offer a wide range of industrial ball valves designed for extreme pressure and durability, backed with API, CE, and ISO 9001/14001 certifications.
