Gas turbine engine fuel system

Claim 1

A GAS TURBINE ENGINE FUEL SYSTEM COMPRISING A THROTTLE VALVE BODY HAVING A PORT THEREIN, A VALVE OBTURATING MEMBER HAVING OPPOSITELY FACING PRESSURE SURFACES AND FREELY MOVABLE IN SAID VALVE BODY SO AS TO THROTTLE FUEL FLOW THROUGH SAID PORT, SAID PRESSURE SURFACES BEING OF EQUAL EFFECTIVE AREAS, AN ENGINE DRIVEN CENTRIFUGAL FUEL PUMP, A CONDUIT CONNECTING THE DELIVERY SIDE OF THE PUMP TO ONE PRESSURE SURFACE OF THE OBTURATING MEMBER, A METERING ORIFICE IN SAID CONDUIT, MEANS FOR CONTINUOUSLY VARYING THE SIZE OF THE METERING ORIFICE IN FUNCTIONAL DEPENDENCE UPON THE VALUE OF A COMPRESSOR PRESSURE, A PASSAGE INTERCONNECTING THE CONDUIT, ON THE UPSTREAM SIDE OF THE METERING ORIFICE, WITH THE OTHER PRESSURE SURFACE OF THE OBTURATING MEMBER, AND GOVERNOR MEANS FOR CONTINUOUSLY VARYING THE PRESSURE OF THE FUEL IN THE PASSAGE TO EFFECT CLOSING MOVEMENT OF THE VALVE OBTURATING MEMBER WHEN THE ENGINE ROTATIONAL SPEED EXCEEDS A SELECTED PREDETERMINED VALUE, THE POSITION OF THE OBTURATING MEMBER IN THE THROTTLE VALVE BODY BEING CONTROLLED SOLELY BY THE ACTION OF FLUID FORCES ACTING ON ITS PRESSURE SURFACES.