A rotary bleed valve ( 10 ) for a gas turbine engine comprises a passage ( 11 ) connecting high pressure gases from a compressor to an exhaust and a valve member ( 12 ), the valve member ( 12 ) may be rotated within the passage ( 11 )so as to vary or if necessary block the flow of compressor gases. The valve member ( 12 ) is shaped such that as the member ( 12 ) moves from a closed to an open position gas flows around the member ( 12 ) induces a torque on the member ( 12 ).
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