Fukui Seisakusho and ClassNK sign MOU on hydrogen dual-fuel engine safety valves

Fukui Seisakusho Co., Ltd. and classification society ClassNK have signed a Memorandum of Understanding (MOU) to jointly study ultra-high pressure safety relief valves intended for hydrogen dual-fuel engines. The agreement was formalized during a signing ceremony at the Gastech 2025 exhibition in Milan, Italy.

The two companies began their collaboration in 2023 with the study of safety relief valves for cargo tanks of liquefied hydrogen carriers. That initiative, launched with an MOU signed at Gastech 2023, led to the issuance of a type approval certificate earlier this year for the PILOT-type low pressure safety relief valve (PSL-MD type).

Building on this outcome, Fukui Seisakusho and ClassNK will now focus on developing ultra-high pressure safety relief valves that meet the specific technical requirements of hydrogen dual-fuel engines. These include material resistance to hydrogen embrittlement and sealing performance for hydrogen fuel supply systems.

The initiative reflects continuing efforts across the maritime and energy sectors to address safety considerations in the adoption of hydrogen as a marine fuel.