Variable limit fuel flow regulator for prime movers

Claim 1

FOR USE IN REGULATING THE FLOW OF FUEL TO A PRIME MOVER, THE COMBINATION OF, A MAIN FUEL VALVE, A HYDRAULIC ACTUATOR INCLUDING A CYLINDER AND A PISTON SLIDABLE THEREIN TO OPEN AND CLOSE SAID VALVE WITH CHANGES IN THE PRESSURE IN THE CYLINDER, MEANS PROVIDING SOURCES OF FLUID AND RELATIVELY HIGH AND LOW PRESSURES, A SELECTIVELY ADJUSTABLE SPEED SENSER HAVING A GOVERNOR CONTROL VALVE REGULATING THE FLOW OF FLUID TO AND FROM SAID CYLINDER, A SECOND CONTROL VALVE INTERPOSED IN SERIES BETWEEN SAID PRESSURE SOURCES AND SAID GOVERNOR VALVE HAVING AN ELEMENT MOVABLE BETWEEN MAXIMUM AND MINIMUM LIMIT POSITIONS AND ADAPTED WHEN IN SUCH POSITIONS TO INTERRUPT THE CONNECTION BETWEEN SAID GOVERNOR VALVE AND ONE OF SAID PRESSURE SOURCES, DEVICES FOR SENSING CHANGES IN CONDITIONS OF SPEED AND AIR TEMPERATURE AND PRESSURE, A SYSTEM NORMALLY ADJUSTED BY EACH OF SAID DEVICES AND COMPUTING MAXIMUM AND MINIMUM LIMITS OF A PERMISSIBLE RANGE OF FUEL FLOW FOR EACH PREVAILING SET OF CONDITIONS, MECHANISM