Reheat apparatus for a gas turbine engine

Claim 1

A GAS TURBINE ENGINE COMPRISING IN FLOW SERIES A COMPRESSOR, MAIN COMBUSTION EQUIPMENT, A TURBINE AND AN EXHAUST DUCT, REHEAT COMBUSTION EQUIPMENT MOUNTED IN SAID EXHAUST DUCT AND HAVING A FUEL CONDUIT LEADING THERETO, A SOURCE OF REHEAT FUEL, CONTROL MEANS SETTABLE TO OPERATIVE AND INOPERATIVE POSITIONS IN WHICH IT RESPECTIVELY PERMITS AND CUTS OFF A FLOW OF REHEAT FUEL FROM SAID SOURCE TO SAID FUEL CONDUIT, AND MEANS FOR SUPPLYING TO THE MAIN COMBUSTION EQUIPMENT A QUANTITY OF FUEL TO FORM A "HOT SHOT" ADAPTED TO IGNITE THE REHEAT FUEL AT THE REHEAT COMBUSTION EQUIPMENT, THE "HOT SHOT" SUPPLY MEANS COMPRISING A FUEL PASSAGE AND A FLOW CONTROL VALVE THEREIN WHICH IS RESILIENTLY URGED TOWARDS THE CLOSED POSITION, THE FUEL PASSAGE, ON THE UPSTREAM SIDE OF THE FLOW CONTROL VALVE, COMMUNICATING WITH THE FUEL CONDUIT SO THAT THE FUEL PRESSURES IN SAID FUEL CONDUIT AND SAID FUEL PASSAGE ARE FUNCTIONALLY RELATED TO EACH OTHER, WHEREBY WHEN THE CONTROL MEANS IS SET IN THE OPERATIVE POSITION THE FUEL PRESSURE IN THE FUEL PASSAGE RISES SO AS TO EFFECT OPENING OF THE FLOW CONTROL VALVE, A SECOND VALVE PROVIDED IN SAID FUEL PASSAGE UPSTREAM OF THE FLOW CONTROL VALVE, A FUEL DUCT, SAID SECOND VALVE CONTROLLING FUEL FLOW INTO THE FUEL DUCT AND BEING ADAPTED TO BE OPENED BY THE PRESSURE IN THE FUEL PASSAGE THE FUEL DUCT COMMUNICATING WITH THE FLOW CONTROL VALVE SO AS TO BE ADAPTED TO APPLY PRESSURE THERETO IN A VALVE CLOSING DIRECTION, AND MEANS RESILIENTLY URGING THE SECOND VALVE TOWARDS A CLOSED POSITION.