Japan’s manufacturer Fukui Seisakusho and compatriot classification society ClassNK have signed a memorandum of understanding (MoU) to collaborate on ultra-high-pressure safety relief valves for hydrogen dual-fuel engines.

As reported, the parties agreed in 2023 to jointly conduct a study for the installation of safety relief valves for cargo tanks of liquefied hydrogen (LH2) carriers on actual ships. As a result of the study, a type approval certificate for the PILOT-type low-pressure safety relief valve (PSL-MD type) was issued in 2025.