| 摘要 |
PURPOSE:To make high pressure fuel control performable in a highly accurate manner, by maintaining the fuel pressure regulated by a pressure regulating valve on one side higher than pressure in a back pressure chamber of a pressure regulating valve on the other as far as the pressure added to the setting one of both pressure regulating valves. CONSTITUTION:A pump 2 pumps up fuel inside a tank 1 and feeds it to each of pipe lines 4 and 5 with pressure. If so, the fuel flows into a fuel chamber 905 of a first pressure control valve 9 passing through an orifice 8 and a pipe line 6 from the pipe line 5, and is sent back to the side of a pipe line 7 by a lift of a movable valve 914. With this, fuel pressure inside the fuel chamber 905 and the pipe line 6 is maintained to high pressure as far as the setting pressure to one inside a back pressure chamber 904, and this fuel is fed to the inside a back pressure chamber 1004 of a second pressure control valve 10. On the other hand, the fuel pressure made to flow in the inside of a fuel chamber 1005 of the second pressure control valve from the pipe line 4 is made to come into a higher pressure state as far as the pressure added to the setting pressure of both these pressure control valves 9 and 10 to pressure inside a suction pipe. |
