Emergency fuel flow control device for a gas turbine engine

Abstract

Abstract THE DISCLOSURE ILLUSTRATES AN EMERGENCY FLOW CONTROL DEVICE FOR USE IN THE FULE CONTROL SYSTEM OF A GAS TURBINE ENGINE. THE FLOW CONTROL DEVICE COMPRISES A HOUSING HAVING A PAIR OF LOW RESISTANCE FLOW PATHS WHICH RECEIVE THE OUTPUT OF A VARIABLE DELIVERY PUMP AND PROVIDE A DISCHARGE TO THE GAS TURBINE ENGINE. A BISTABLE SOLENOID OPERATED BYPASS VALVE IS POSITIONED IN THE FIRST FLOW PATH TO SELECTIVELY BLOCK AND PERMIT FLOW. A SLEEVE-TYPE METERING VALVE IS POSITIONED IN THE SECOND FLOW PATH AND ROTATED BY A MANUALLY OPERATED LEVER TO PROVIDE A VARIABLE ARE ORIFICE. A DIAPHRAGM OPERATED THROTTLING VALVE ELEMENT IS POSITIONED UPSTREAM OF THE METERING VALVE ELEMENT. PRESSURE CONNECTIONS TO THE UPSTREAM AND DOWNSTREAM SIDE OF THE METERING VALVE ELEMENT ARE CONNECTED TO THE DIAPHRAGM. THE THROTTLING VALVE ELEMENT MAINTAINS A CONSTANT PRESSURE DIFFERENTIAL ACROSS THE METERING VALVE WHEN THE BYPASS VALVE ELEMENT BLOCKS FLOW THROUGH THE SECOND FLOW PATH. THE BYPASS VALVE ELEMENT IS RESPONSIVE TO A CONDITION WHERE A CONTROLLER FOR THE VARIABLE OUTPUT PUMP IS INOPERATIVE AND PLACES THE PUMP IN A MAXIMUM DELIVERY CONDITION. IN ADDITION, A CUTOFF VALVE IS PROVIDED IN THE OUTLET TO PASS FLOW TO THE ENGINE ONLY WHEN A CONTROL INPUT IS PROVIDED. A MANUAL CONTROL INPUT FROM THE OPERATOR LEVER AND A SOLENOID INPUT EACH OPERATE TO PLACE THE CUTOFF VALVE ELEMENT IN AN OPEN OR CLOSED POSITION.

Inventors

• 👤 Paul A Avery

Bibliographic Details