A servo valve comprising: a valve housing ; a cavity formed in the valve housing and defining a longitudinal axis (X); and a member disposed in the cavity and axially-moveable therein, wherein the member comprises first and second cylindrical sections having a first radius (R1, R2), a central cylindrical section located between the first and second cylindrical sections and having a second radius (R3) smaller than the first radius (R1, R2), and first and second frusto-conical sections connecting the first and second sections to the central section and forming respective first and second frusto-conical surfaces , wherein the member defines an annular channel radially between the member and the valve housing , and the annular channel is bounded by the first and second cylindrical sections , and wherein the valve housing comprises a plurality of ports , each forming a fluid passage through the valve housing in fluid communication with the annular channel , the plurality of ports comprising first and second ports each defining a diameter, characterised in that : the first and second ports have first and second nozzles with first and second nozzle openings for providing fluid communication between the annular channel and a spool, the first and second nozzle openings each having diameters smaller than the diameter of their respective port , wherein, in a first axial position of the member the second nozzle opening is at least substantially obstructed by the second frusto-conical surface and the first nozzle opening is at least substantially unobstructed by the first frusto-conical surface , and in a second axial position of the member the first nozzle opening is at least substantially obstructed by the first frusto-conical surface and the second nozzle opening is at least substantially unobstructed by the second frusto-conical surface . a valve housing ; a cavity formed in the valve housing and defining a longitudinal axis (X); and a member disposed in the cavity and axially-moveable therein, wherein the member comprises first and second cylindrical sections having a first radius (R1, R2), a central cylindrical section located between the first and second cylindrical sections and having a second radius (R3) smaller than the first radius (R1, R2), and first and second frusto-conical sections connecting the first and second sections to the central section and forming respective first and second frusto-conical surfaces , wherein the member defines an annular channel radially between the member and the valve housing , and the annular channel is bounded by the first and second cylindrical sections , and wherein the valve housing comprises a plurality of ports , each forming a fluid passage through the valve housing in fluid communication with the annular channel , the plurality of ports comprising first and second ports each defining a diameter, the first and second ports have first and second nozzles with first and second nozzle openings for providing fluid communication between the annular channel and a spool, the first and second nozzle openings each having diameters smaller than the diameter of their respective port , wherein, in a first axial position of the member the second nozzle opening is at least substantially obstructed by the second frusto-conical surface and the first nozzle opening is at least substantially unobstructed by the first frusto-conical surface , and in a second axial position of the member the first nozzle opening is at least substantially obstructed by the first frusto-conical surface and the second nozzle opening is at least substantially unobstructed by the second frusto-conical surface . <EOS>