METERING VALVE FOR A PUMP UNIT FOR FEEDING FUEL TO INTERNAL COMBUSTION ENGINE AND PUMP UNIT COMPRISING SUCH A VALVE

A metering valve for a pump unit for feeding fuel from a tank to an internal combustion engine; the metering valve comprising: a sleeve having an axis A and provided with a first open end for receiving a thruster, a second opposite end provided with an opening for axially discharging the fuel and at least one side opening for feeding fuel; a plug-shaped piston housed slidably along the axis A inside the sleeve, the piston being provided with a closed end having an outer surface in contact with the thruster, an open opposite end and at least one side opening; a plug housed inside the discharge opening of the sleeve and provided with an axial opening; a spring arranged between the plug and the inner surface of the closed end of the sleeve.