Lucas Industries Limited

Goodrich Control Systems Limited

Glyn Edward Dixon

Trevor Stanley Smith

Martin Kenneth Yates

Michael Griffiths

Philip Laurence Elliott

A gear pump arrangement comprising a pair of intermeshing gears () located between bearing blocks () and rotatable to pump fluid from an inlet () to an outlet (), wherein at least one of the bearing blocks () comprises a body () formed with a recess () within which an insert () is located, the recess () and insert () being shaped so as to be of smaller dimensions at a bearing surface () of the bearing block () than at a point remote therefrom.

Gear pump arrangement with erosion resistant insert

According to the present invention there is provided a fuel injection system for a combustion engine, comprising:

Fuel injection system for a combustion engine

A fuel system for a gas turbine engine having a main burner fuel supply line and a pilot burner fuel supply line, a high pressure pump supplying fuel to the main and pilot burner supply lines in use, a throttle valve controlling the flow of fuel in the main burner supply line, a metering valve controlling the flow of fuel in the pilot burner supply line, and a pressure raising valve between the pilot burners and the metering valve, the pressure raising valve serving to maintain the upstream fuel pressure to a pre-determined amount in excess of the pressure of fuel supplied from the throttle valve to the main burners.

Fuel system

An hydraulic valve arrangement including a fluid pressure actuable valve which is actuable between a first position in which fluid flow through the fluid pressure actuable valve is prevented and a second position in which fluid flow through the fluid pressure actuable valve is permitted at a first rate. The hydraulic valve arrangement also includes a second valve which is actuable between an open state, in which fuel flows through the second valve at a second rate, and a closed state in which there is no flow through the second valve. The fluid pressure actuable valve is arranged such that, upon initial actuation of the second valve to its open state, the fluid pressure actuable valve is caused to move into the second position, and whereby the fluid pressure actuable valve remains in the second position upon subsequent switching of the second valve between the open and closed states, thereby to permit the rate of flow of fuel through the hydraulic valve arrangement to be varied by switching of the second valve.

Hydraulic valve arrangement

A fluid metering valve, for example as shown in FIG. 1, comprises a valve element moveable, axially and angularly, by a drive member, a sensor arranged to monitor the position occupied by a target carried by the drive member, and an adjustment arrangement whereby the axial position of the target can be adjusted relative to the drive member independently of the angular position of the target. A backlash free connection may be provided between the valve element and the drive member, the backlash free connection comprising a projection protruding laterally from one of the drive member and the valve element, the projection being received within a recess associated with the other of the drive member and the valve element, the dimensions of the projection and the recess being such that the projection engages the sides of the recess but is spaced from the base thereof, and biasing means urging the projection towards the base of the recess.

Fluid metering valve

A fluid flow system for supplying fuel to an engine, the system including a fluid flow valve having a valve element movable alternatively to a first operative position in which a relatively low fluid flow rate is permitted through the valve, for achieving a normal gradual shut-off of fuel supply, and a second operative position in which a relatively high fluid flow rate is permitted through the valve, for achieving a rapid emergency shut-off of fuel supply. Also disclosed is a fluid flow valve for use in the system. The invention has application in aircraft gas turbine engines.

Growing community of inventors

Cheltenham, United Kingdom

Glyn Edward Dixon