Fuel valve for injecting low flash point fuel into the combustion chamber of a turbocharged large two-stroke self-igniting internal combustion engine

摘要

A fuel valve (50) for injecting low flashpoint liquid fuel into the combustion chamber of a large two-stroke turbocharged self-igniting internal combustion engine. The fuel valve (50) is provided with: an elongated fuel valve housing (52), a nozzle (54) disposed at the front end of the elongated valve housing (52), a fuel inlet port (53), an actuation liquid port (78), an axially displaceable valve needle (61) slidably received in a longitudinal needle bore (64), the valve needle (61) having a closed position and an open position, the valve needle (61) rests on a valve seat (69) in the closed position and the valve needle (61) has lift from the valve seat (69) in the open position and the valve needle (61) being biased towards the closed position, a fuel chamber (58) surrounding the valve needle (61) and opening to the valve seat (69), a pump piston (80) received in a first bore (81) with a pump chamber (82) in the first bore (81) on one side of the pump piston (80), an actuation piston (83) received in a second bore (84) with an actuation chamber (85) in the second bore (84) on one side of the actuation piston (83), the pump piston (80) being connected to the actuation piston (83) to move in unison therewith, the actuation chamber (85) being connected to the actuation liquid port (78), the pump chamber (82) having an outlet connected to the fuel chamber (58) and an inlet connected to the fuel inlet port (53) via a non-return valve (74) in the elongated fuel valve housing (52) that prevents flow from the pump chamber (82) to the fuel inlet port (53). It is suggested that Fig. 7 is published with the abstract