Fukui develops pilot-operated safety-relief valves for ME-GI dual-fuel engines

摘要

Tougher emissions regulations demand better technical solutions. One example is the IMO's MARPOL Annex Ⅵ, adopted in 1997, which limits the main air pollutants from ships' exhaust gas, including SOx and NOx, and prohibits ozone-depleting emissions. That legislation has been upgraded and MARPOL Annex Ⅵ places even more stringent environmental limits. MAN B&W has developed the ME-GI dual-fuel engine to respond to this more demanding requirement. It combusts high-pressure LNG vapour and offers efficiency and reliability and environmental benefits to the LNG carriers, roro vessels and containerships that install them. Fukui hopes to benefit from growing demand for ME-GI propulsion systems and has developed the RPS-type pilot-operated safety-relief valve for these dual-fuel gas-supply systems. Our valves aim to deliver superior seat tightness under high pressure. We designed the main valve piston with a larger area on the dome of the piston than on the seat so that the net force holds the piston tightly against the main valve nozzle.