| 摘要 |
The present invention is an improvement to fuel pumps/injectors in which fuel is pressurized in a fuel chamber to a pressure great enough to open an injection valve allowing the fuel to be ejected under pressure into the combustion cylinder of an engine. More particularly, the present invention is a device positioned in the fuel path which typically runs from the plunger chamber to the injection valve. For injection, the device is positioned to allow fuel to flow from the plunger to the injection valve. To end injection, the device closes off the flow of fuel thereby separating the fuel path into two portions. The drainage of fuel from the first portion is restricted by an orifice, thereby maintaining pressure in the first portion which prevents the fuel pressurizing mechanism components from separating. In the second portion, pressure is vented back to the fuel supply manifold thereby allowing the injection valve to quickly close, ending injection.
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