Tokyo – Fukui Seisakusho Co., Ltd. and ClassNK have signed an MOU (Memorandum of Understanding) for joint consideration of ultra-high pressure safety relief valves designed for the use in hydrogen dual-fuel engines, and hosted a signing ceremony at the Gastech 2025 exhibition being held in Milan, Italy.
Both parties agreed in 2023 to jointly conduct study for installation of safety relief valves for cargo tanks of liquefied hydrogen carriers on actual ships, and signed a MOU in Gastech 2023. As a result of this study, a type approval certificate for the PILOT-type low pressure safety relief valve (PSL-MD type) was issued this year.
On the back of that milestone, the parties have now agreed to cooperate on ultra-high-pressure safety relief valves for hydrogen dual-fuel engines that can reportedly meet advanced technical requirements (material resistance to hydrogen embrittlement, sealing performance, etc.) needed for hydrogen fuel supply systems.
It is understood that Fukui will manage the development of RPS-type (high-pressure compatible) safety relief valves for hydrogen dual-fuel engines, while ClassNK will be responsible for the review of the valves based on prescribed rules upon receiving an application for type approval.
Through the collaboration, both parties seek to contribute to the social implementation of propulsion systems using hydrogen as a fuel.