Gas turbine fuel system

Claim 1

A BYPASS VALVE MEANS FOR A GAS TURBINE FUEL SYSTEM COMPRISING: MEANS PROVIDING A PAIR OF PASSAGES ADAPTED TO COMMUNICATE WITH A SOURCE OF FUEL UNDER PRESSURE, THE FIRST OF SAID PASSAGES LEADING TO AN EXHAUST OUTLET AND THE SECOND TO AN OUTLET ADAPTED TO BE CONNECTED TO A TURBINE COMBUSTOR NOZZLE; A BYPASS VALVE IN THE FIRST OF SAID PASSAGES TO CONTROL FUEL FLOW THERETHROUGH; MOVABLE WALL MEANS DISPOSED TO MOVE SAID BYPASS VALVE IN OPPOSITE DIRECTIONS BETWEEN OPEN AND CLOSED POSITIONS; RESTRICTION MEANS IN THE SECOND OF SAID PASSAGES FOR RESISTING FUEL FLOW HERETHROUGH TO CREATE A PRESSURE DIFFERENTIAL, A FIRST PORTION OF SAID WALL MEANS BEING EXPOSED TO SUCH FUEL PRESSURE DIFFERENTIAL AND OPERATIVE UPON AN INCREASE THEREIN TO MOVE SAID BYPASS VALVE TOWARD OPEN POSITION; RESILIENT MEANS DISPOSED TO YIELDABLY RESIST MOVEMENT OF SAID BYPASS VALVE OWARD OPEN POSITION IN RESPONSE TO SAID FUEL PRESSURE DIFFERENTIAL; MEANS FOR APPLYING FLUID PRESSURE FROM A SECOND SOURCE TO A SECOND PORTION OF SAID MOVABLE WALL MEANS TO URGE SAID BYPASS VALVE TOWARD A CLOSED POSITION IN OPPOSITION TO SAID FUEL PRESSURE DIFFERENTIAL; AND MEANS FOR APPLYING FLUID PRESSURE FROM A COMMON SOURCE TO OPPOSED SURFACES OF A THIRD PORTION OF SAID MOVABLE WALL MEANS, INCLUDING MEANS FOR RESTRICTING FLUID FLOW TO ONE SURFACE OF SAID THIRD PORTION WHEREBY AN INCREASE IN FLUID PRESSURE DIFFERENTIAL ON SAID THIRD PORTION OF THE MOVABLE WALL MEANS TENDS TO OPEN SAID BYPASS VALVE.