Hydraulic fuel control

Claim 1

FOR A TURBINE TYPE POWER PLANT HAVING A COMPRESSOR AND A TURBINE DRIVING THE COMPRESSOR, A FUEL CONTROL HAVING A HYDRAULIC COMPUTING SYSTEM COMPRISING A PLURALITY OF PARALLELLY DISPOSED FLUID PASSAGES ALL OF WHICH COMMUNICATE WITH A COMMON INLET PASSAGE AND A COMMON OUTLET PASSAGE CONNECTED TO SAID POWER PLANT, A FUEL METERING VALVE IN SAID COMMON OUTLET PASSAGE FOR REGULATING THE FLUID PASSING THERETHROUGH, SPACED VALVE MEANS SERIALLY DISPOSED IN ONE OF SAID PARALLEL DISPOSED PASSAGES ESTABLISHING A HYDRAULIC PRESSURE INDICATIVE OF A DESIRED W/P SURGE SCHEDULE, WHERE W=FUEL FLOW IN POUNDS PER HOUR, AND P=COMPRESSOR DISCHARGE PRESSURE, SPACED VALVE MEANS SERIALLY DISPOSED IN ANOTHER OF SAID PARALLEL DISPOSED PASSAGES ESTABLISHING A DESIRED W/P OVERTEMPERATURE SCHEDULE, SPACED VALVE MEANS SERIALLY DISPOSED IN ANOTHER OF SAID PARALLEL DISPOSED PASSAGES ESTABLISHING AN ACTUAL W/P VALUE, AND CONTROL MEANS FOR COMPARING SAID ACTUAL W/P VALUE WITH SAID W/P SURGE SCHEDULE OR SAID W/P OVERTEMPERATURE SCHEDULE FOR CONTROLLING SAID FUEL METERING VALVE.