Gaseous fuel feed systems for internal combustion engines

Claim 1

IN GASEOUS FUEL FEED SYSTEMS FOR INTERNAL COMBUSTION ENGINES AND THE LIKE, THE COMBINATION OF AN AIR AND MIXTURE PASSAGE HAVING AN OUTLET TO THE ENGINE INTAKE MANIFOLD, AN AIR INTAKE AND A VENTURI THROAT BETWEEN INTAKE AND OUTLET, A PERMANENT OBSTRUCTION IN THE AIR INTAKE POSITIVELY IMPOSING A PRESSURE REDUCTION WITH RELATION TO ATMOSPHERIC PRESSURE ON THE AIR PASSING THERETHROUGH AT MINIMUM FLOW, A GAS PRESSURE REGULATOR COMPRISING A PRESSURE REGULATING VALVE CONTROLLING GAS FLOW FROM AN INITIAL INLET TO A DELIVERY CHAMBER, A DIAPHRAGMVALVE SYSTEM INCLUDING SAID VALVE AND A VALVE OPERATING DIAPHRAGM HAVING ONE FACE EXPOSED TO FLUID PRESSURE IN THE DELIVERY CHAMBER AND THE OTHER FACE EXPOSED TO FLUID PRESSURE IN A REFERENCE CHAMBER, THE FLUID PRESSURE IN THE DELIVERY CHAMBER EXERTING A FORCE ON SAID DIAPHRAGM TENDING TO MOVE IT IN A VALVE CLOSING DIRECTION AND THE FLUID PRESSURE IN THE REFERENCE CHAMBER EXERTING A FORCE ON SAID DIAPHRAGM TENDING TO MOVE IT IN A VALVE OPENING DIRECTION, MEANS NORMALLY APPLYING AN ADDITIONAL DEFINITE CLOSING FORCE TO THE VALVE WHEREBY THE VALVE IS NORMALLY CLOSED WITH A DEFINITE PRESSURE WHEN FLUID PRESSURES ON OPPOSITE FACES OF THE VALVE OPERATING DIAPHRAGM ARE EQUAL, A GAS DELIVERY PASSAGE LEADING FROM THE DELIVERY CHAMBER TO THE VENTURI THROAT, AN AUXILIARY DIAPHRAGM EXPOSED ON ONE FACE TO THE AMBIENT ATMOSPHERIC PRESSURE AND ON ITS OPPOSITE FACE TO THE PRESSURE IN AN AUXILIARY DIAPHRAGM CHAMBER, MEANS APPLYING TO THE REFERENCE CHAMBER AND IN THE AIR AND MIXTURE PASSAGE DOWNSTREAM OF THE AIR TO THE AUXILIARY DIAPHRAGM CHAMBER THE PRESSURE EXISTENT INTAKE OBSTRUCTION, AND MEANS ACTUATED BY MOVEMENT OF THE AUXILIARY DIAPHRAGM INTO THE AUXILIARY DIAPHRAGM CHAMBER TO EFFECTIVELY DECREASE THE VALVE CLOSING PRESSURE EXERTED ON THE VALVE BY THE VALVE CLOSING MEANS.