Brake proportioning valve

Claim 1

A VALVE DEVICE FOR PROPORTIONATELY REDUCING HYDRAULIC FLUID PRESSURE BEING SUPPLIED TO THE REAR WHEEL CYLINDERS OF A VEHICLE COMPRISING: A HOLLOW VALVE BODY CASING HAVING A SMALL INLET BORE AND A LARGER OUTLET BORE, AN INLET PASSAGEWAY CONNECTED TO SAID INLET BORE AND ADAPTED TO BE CONNECTED TO THE BRAKE ACTUATING CYLINDER, AN OUTLET PASSAGEWAY CONNECTED TO SAID OUTLET BORE AND ADAPTED TO BE CONNECTED TO THE REAR WHEEL CYLINDERS, A PISTON BODY HAVING AN INLET END PISTON AND AN OUTLET END PISTON SLIDABLY MOUNTED IN SAID INLET AND OUTLET BORES OF SAID VALVE BODY CASING AND FORMING SEALED OPPOSED INLET AND OUTLET FLUID CHAMBERS THEREIN RESPECTIVELY, AN APERTURE THROUGH SAID PISTON BODY INTERCONNECTING SAID INLET AND SAID OUTLET CHAMBERS, RESILIENT MEANS URGING SAID PISTON BODY TOWARD SAID OUTLET PASSAGEWAY, A VALVE SEAT AROUND SAID APERTURE AT SAID INLET END OF SAID PISTON BDY, A VALVE BODY MOVABLY MOUNTED IN SAID INLET BORE OF SAID VALVE BODY APART FROM AND OPPOSITE SAID APERTURE IN SAID PISTON BODY, RESILIENT MEANS URGING SAID VALVE BODY AWAY FROM THE END OF SAID INLET PISTON AND AGAINST A STOP ADJACENT SAID INLET PASSAGEWAY, MEANS PROVIDING A FLUID PASSAGEWAY AROUND SAID VALVE BODY WHEN DISPOSED AGAINST SAID STOP, AND A VALVE FACE ON SAID VALVE BODY OPPOSITE SAID VALVE SEAT, SAID PISTON BODY BEING MOVED TOWARD SAID VALVE BODY DUE TO AN INCREASE IN HYDRAULIC PRESSURE IN THE VALVE BODY TO SEAL OFF SAID APERTURE CAUSING SAID PISTON BODY AND SAID VALVE BODY TO COOPERATE TO FORM A A PRESSURE REDUCING PISTON BODY IN SAID BORES OF SAID VALVE BODY CASING TO PROPORTIONATELY REDUCE A FURTHER INCREASE IN THE HYDRAULIC FLUID PRESSURE SUPPLIED TO THE REAR WHEEL CYLINDERS OF A VEHICLE.