Valve for diverting fluid flows in turbomachines

A fluid flow diverter valve for a gas turbine engine of the type that comprises a fluid flow duct, first and second axial flow compressors spaced along the duct, a combustible means downstream of the compressors, turbine means downstream of the combustion means connected to the compressors to drive the compressors, one or more air outlet openings in the duct wall of a region between the first and second compressors, and an auxilliary air intake in the duct wall spaced along the duct from the one or more outlet openings and located at a region between the one or more outlet openings and the second compressor, the valve comprising:

• a hollow tubular sleeve extending co-axially along the duct, the sleeve being movable in directions along the duct, and being provided with one or more openings which in a first position of the sleeve uncover the auxilliary air intake in the duct wall;
• a plurality of doors each of which is pivotally mounted at one of its ends on the sleeve, the doors being spaced around the axis of the duct and being shaped and positioned so that in a first position of the doors they lie along the length of the duct and at least one of the doors obturates the one or more openings in the sleeve and in a second position of the doors the free end of each door is moved radially inwards and each door co-operates with the other doors and thereby obturate the duct;
• a plurality of links each of which is pivotally mounted at one end to a member which is fixed and is pivotally connected at its other end to one of the doors;
• an actuator for translating the sleeve from the first position of the sleeve where the sleeve and the doors obturate the one or more openings in the duct wall and the auxilliary air intake and provides a flow path from the first compressor to the second compressor, to a second position of the sleeve where the links pull open the doors and move them to a position where they obturate the flow path from the first compressor to the second compressor and the sleeve uncovers the one or more outlet openings in the duct wall and uncovers the auxilliary air intake.