Compressed gas pressure regulator designed for engine fuelling

A compressed gas pressure regulator is described, designed for fuelling engines with the gas injection system, which includes an inlet connected to a vaporiser and one or more outlets connected to the engine fuelling system. In particular, the pressure regulator includes: a pressurised gas inlet chamber (5) a chamber (12) that communicates with said inlet chamber being filled with a thin metal wool (40) designed to trap impurities a reduction chamber (20) a pipe (13) that connects said chamber (12) with said reduction chamber (20) a lever-operated device (30) that closes said pipe (13), on which a membrane acts, said membrane being subject to the low pressure present in said chamber (20) on one side and to a reference pressure and a calibration spring (32) on the other a cut-off solenoid valve (18) which activates a piston (16) designed to close the communication between said inlet chamber (5) and said pipe (13), the axis of which said piston substantially coincides with the axis of said pipe (13).