Fuel line purging device

Details Fuel line purging device Fuel line purging device

1986-08-26

1988-03-22

Miller, Carl Stuart

Internal-combustion engines

Charge forming device

Fuel flow regulation between the pump and the charge-forming...

123457, 123514, 123456, F02M 3900

Patent

active

047321318

ABSTRACT:
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.

REFERENCES:
patent: 1991586 (1935-02-01), Vincent
patent: 3606908 (1971-09-01), Riester
patent: 3789819 (1974-02-01), Moulds
patent: 4079717 (1978-03-01), Shirose
patent: 4393844 (1983-07-01), Skinner
patent: 4440138 (1984-04-01), Smith
patent: 4527528 (1985-07-01), Finn
patent: 4539959 (1985-09-01), Williams
patent: 4625701 (1986-12-01), Bartlett

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