Large two-stroke compression ignition internal combustion engine with fuel injection system for low flash point fuel and fuel valve therefor

摘要

A fuel valve (50) for injecting low flashpoint liquid fuel into the combustion chamber of a large two-stroke engine. The fuel valve (50) comprises a valve housing (52), a nozzle (54), a fuel inlet port (76) for connection to a source of pressurized low flashpoint fuel, an actuation fluid port (78) for connection to a source of actuation fluid, a valve needle (61) in a longitudinal bore in the fuel valve (50) that allows flow of fuel from a fuel cavity (58) to the nozzle (54) when the valve needle (61) is in its open position, a pump piston (80) connected to an actuation piston (83), an actuation chamber (85) connected to the actuation fluid port (78), a pump chamber (82) fluidically connected to the fuel cavity (58) and fluidically connected to the fuel inlet port (76), a sealing liquid inlet port (70) for connection to a source of pressurized sealing liquid (Ps), a sealing oil flow path (93,96,97,99) connecting the sealing liquid inlet port (70) to the longitudinal bore, an ignition liquid inlet port (92) for connection to a source of pressurized ignition liquid (Pi), an ignition liquid conduit (94) extending from the ignition liquid inlet port (92) to a clearance (91) between the bore (81) and the pump piston (80) for sealing the pump piston (80) in the first bore (81) and for delivering a quantity of ignition liquid to the pump chamber (82).