| 摘要 |
A fuel injection system is provided with a purging device (14) for purging gas, including air and vapor, from the system. The device includes a pressure responsive valve (22) permitting gas to flow from an inlet (16) connected to the high pressure fuel injection line (8) to a vent outlet (18), and blocking flow when gas has been purged from the system and fuel pressure rises. A first branch passage (24) communicates between the inlet (16) and one side (26) of the valve (22), and a second branch passage (28) communicates between the inlet (16) and the other side (30) of the valve (22) and also with the outlet (18). A restriction orifice (34) in the second branch passage (28) provides a fuel pressure drop thereacross but does not substantially drop gas pressure thereacross, such that pressurized fuel causes a higher pressure on the one side (26) of the valve (22) than on the other side (30) of the valve ( 22), which pressure differential closes the valve.
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