Patent ID: 9677524
Date: 2017-06-13
CPC Classifications: F02M

Claim:
1. A valve for regulating the pressure of the fuel in the common rail of the diesel injection system of a vehicle internal combustion engine, the valve comprising a body, a shaft, an actuator and a nozzle itself comprising a fixed member provided with a nozzle seat in the center of which there opens a discharge orifice connecting the common rail to a discharge duct; the shaft, arranged axially sliding in a central bore of the body such that the shaft is guided by the central bore, the shaft being moved by the actuator in such a way as to cause the nozzle to switch between the discharge orifice being in an open state (EO) when the pressure in the common rail is above a pre-established limit (L), and the discharge orifice being in a closed state (EF) when the pressure in the common rail is below the pre-established limit (L), characterized in that the valve further comprises a shutoff member arranged between the shaft and the seat so that in the closed state (EF) the shaft pushes the shutoff member into abutment against the seat shutting off the discharge orifice and in the open state (EO) the pressurized fuel pushes the shutoff member back and opens the discharge orifice, the shaft itself being pushed back by the shutoff member, the fixed member of the nozzle comprising a tubular part defining an interior guide cylinder extending axially from an open first end as far as the seat forming the bottom end of the guide cylinder, the shutoff member arranged and guided in the guide cylinder independently of the shaft, the guide cylinder being in fluidic communication with the discharge duct.