Patent ID: 7100581

Claim:
A system for supplying gas for an internal-combustion engine, comprising: a plurality of electromagnetically controlled injectors, associated to the various cylinders of the engine; a distribution manifold or rail, communicating with said injectors; a reservoir for supply of the rail, where pressurized gas is accumulated; and a pressure-reducing valve set in connection between the reservoir and the aforesaid rail, wherein the valve has a chamber connected to the system of air supply to the internal-combustion engine so as to enable any leakage of gas that reaches said chamber to be discharged therein wherein said chamber is connected to the intake manifold of the internal-combustion engine, and wherein the valve comprises: a valve body, with an inlet connector connected to the reservoir and an outlet connector connected to the rail; a restricted passage defined inside the valve body for communication between the inlet connector and the aforesaid outlet connector; an open/close element for controlling communication through said restricted passage; and a piston member, mobile inside the valve body, for controlling said open/close element, having one end facing a first chamber within said valve body, set in the path of connection of the inlet connector with the outlet connector, and the opposite end facing a second chamber within said valve body, and the piston member is slidably moveable inside the valve body, wherein said second chamber is connected to the system for supply of air to the internal-combustion engine so as to be able to discharge therein any flow of gas that leaks from said first chamber to said second chamber, and wherein a shutoff valve is set in the connection between said second chamber and the system for supply of air to the internal-combustion engine, and wherein the shutoff valve is a solenoid valve, which is controlled in opening upon ignition of the engine and returns automatically into the closing condition when the engine is turned off, and wherein the shutoff valve is incorporated in the pressure-reducing valve.