| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a back pressure control valve maintaining a back pressure side of a fuel injection device at a normal pressure and avoiding a delivery side of a low pressure fuel pump and a fuel tank side from being always connected with each other. <P>SOLUTION: The back pressure control valve M is used for a low pressure fuel system in which a delivery side of a feed pump C for sucking up the fuel of the fuel tank A is connected with a back pressure side of an injector J as the fuel injection device and a reflux fuel passage 8 for refluxing the fuel in both the back pressure side and the fuel tank A. In a starting operation, a switching means connects the delivery side of the pump C with the back pressure side of the injector J, and shuts off a space between the delivery side of the pump C and the fuel tank A side and a space between the back pressure side of the injector J and the fuel tank A side. In a normal operation, the switching means connects the back pressure side of the injector J with the fuel tank A side, and shuts off a space between the delivery side of the pump C and the fuel tank A side and a space between the delivery side of the pump C and the back pressure side of the injector J. <P>COPYRIGHT: (C)2009,JPO&INPIT |
