Servo governor having emergency control means

Claim 1

IN A FUEL FEED AND POWER CONTROL SYSTEM FOR AN INTERNAL COMBUSTION ENGINE, A FUEL CONDUIT FOR CONDUCTING FUEL TO THE ENGINE, A FUEL METERING RESTRICTION IN SAID CONDUIT, RECIPROCAL GOVERNOR VALVE MEANS FOR CONTROLLING THE FLOW OF FUEL THROUGH SAID RESTRICTION, SAID VALVE MEANS INCLUDING FIRST AND SECOND VALVE ELEMENTS DIRECTLY RESPONSIVE TO FLUID PRESSURES, A REGULATED FLUID PRESSURE SOURCE CONTAINING FLUID AT A FIRST PRESSURE COMMUNICATING WITH SAID VALVE ELEMENT, RESTRICTIVE PASSAGE MEANS OPERABLE TO TRANSMIT FLUID FROM SAID FIRST TO SAID SECOND VALVE ELEMENT AT A SECOND PRESSURE, CONTROL MEANS FOR CONTROLLING THE LEVEL OF SAID SECOND PRESSURE, WITH SAID CONTROL MEANS INCLUDING A SERVO CONTROL VALVE OPERATIVE WITH A SERVO ORIFICE MEMBER FOR CONTROLLING THE MOVEMENT OF SAID VALVE MEANS, SAID CONTROL MEANS INCLUDING A HOUSING MEMBER FOR SAID SERVO VALVE, WITH SAID HOUSING MEMBER BEING ADAPTED TO MOVE SAID ORIFICE MEMBER IN THE EVENT SAID SERVO VALVE BECOMES INOPERATIVE WITH REGARD TO CONTROLLING THE MOVEMENT OF SAID VALVE MEANS, AND AN ENGINE SPEED RESPONSIVE MECHANISM CONNECTED TO SAID CONTROL MEANS FOR MAINTAINING A GIVEN PRESSURE DIFFERENCE BETWEEN SAID FIRST AND SECOND FLUID PRESSURES DURING EQUILIBRIUM OPERATION OF THE ENGINE AT ANY GIVEN SPEED.