Afterburner fuel regulator responsive to compressor discharge absolute pressure

Claim 1

FOR USE WITH AN AIRCRAFT TURBOJET ENGINE HAVINGG AN AIR COMPRESSOR, A MAIN COMBUSTION CHAMBER, A GAS TURBINE, ANN AFTERBURNER COMBUSTION CHAMMBER FOR REHEATING THE EXHAUST GASES FROM SAID TURBINE, A FUEL PUMP FOR SUPPLYING FUEL TO SAID MAIN AND AFTERBURNER CHAMBERS, AND A MAIN FUEL CONTROL FOR AUTOMATICALLY REGUALTING THE SUPPLY OF FUEL TO SAID MAIN COMBUSTIONN CHAMBER SOLELY IN ACCORDANCE WITH THE UNMODIFIED, ABSOLUUTE DISCHARGE PRESSURE OF SAID COMPRESSOR; AN AFTERBURNNER FUEL CONTROL APPARATUS FOR CONTROLLING THE TOTAL FLOW OF FUEL FROM SAID PUMP TO SAID AFTERBURNER CHAMBER SOLELY IN ACCORDANCE WITH SAID PRESSURE, COMPRISING A FUEL FLOW METERING VALVE, FIRST MEANS, ACTUATED BY SAID PRESSURE, FOR VARYING THE FLOW AREA THROUGH SAID VALVE SOLELY IN ACCORDANCE WITH SAID VALUES OF SAID PRESSURE THROUGHOUT THE OPERATING RANGE OF SAID APPARATUS; SAID SECOND MEANS INCLUDING A BY-PASS VALVE FOR RETURNING FUEL NOT PASSING THROUGH SAID METERING VALVE TO THE INLET SIDE OF SAID PUMP; THE OPENING OF SAID BY-PASS VALVE BEING RESPONSIVE TO THE DIFFERENTIAL BETWEEN THE DISCHARGE PRESSURE OF SAID PUMP AND A CONTROL PRESSURE WHICH IS REGULATED BY MEANS RESPONSIVE TO THE PRESSURE DIFFERENTIAL ACROSS SAID METERING VALVE; SAID AFTERBURNER FUEL CONTROL HAVING MEANS FOR SHUTTING OFF THE FUEL FLOW TO SAID AFTERBURNER CHAMMBER, AT THE WILL OF THE AIRCRAFT PILOT, COMPRISING: A FIRST TRANSFER VALVE, OPERATED BY A SOLENOIDD AND AN ELECTRICAL SWITCH, WHEREBY THE PILOT MAY ENERGIZE OR DEENERGIZE SAID SOLENOID BY MMOVING SAID SWITCH TO AN "ON" OR "OFF" POSITION; SAID TRANSFER VALVE BEING SO ARRANGED THAT, WHEN SAID SOLENOID IS SO DEENERGIZED SAID TRANSFER VALVE CUTS OFF FUEL FLOW FROM DOWNSTREAM OF SAID METERING VALVE TO SAID BY-PASS VALVE, AND REDUCES SAID CONTTROL PRESSURE TO FUEL PRESSURE UPSTREAMM OF SAID PUMP, WHEREUPONN SAID BY-PASS VALVE MOVES TO FFULL OPEN POSITION, SO TTHAT ALL OF THE FUEL DELIVERED BY SAID PUMP IS RECIRCULATED, AND NO FUEL FLOWS FROM SAID CONTROL APPARATUS TO SAID AFTERBURNER CHAMBER.