A servo valve comprising: a valve housing; a cavity formed in the valve housing and defining a longitudinal axis; a member disposed in the cavity and axially moveable therein along said longitudinal axis, wherein the member comprises: first and second cavity sealing sections (60a, 60b) having first and second cross-sectional areas, for engaging an inner surface of the valve housing defining the cavity; first and second obstructing sections (61a, 61b) arranged between the first and second cavity sealing sections (60a, 60b); a middle portion located between the first and second obstructing sections (61a, 61b) and having a third cross-sectional area smaller than both the first and second cross-sectional areas so as to form a channel within the cavity bounded by the first and second obstructing sections (61a, 61b), and first and second surfaces (64a, 64b) formed respectively on the first and second obstructing sections (61a, 61b) arranged parallel to the direction of the longitudinal axis; and a plurality of ports (48a, 48b, 48c), each forming a fluid passage through the valve housing in fluid communication with the channel, the plurality of ports (48a, 48b, 48c) comprising first and second ports (48a, 48c), characterised in that: the first and second obstructing sections (61a, 61b) are first and second nozzle obstructing sections, and the first and second ports (48a, 48c) have first and second nozzles (50a, 50c) with first and second nozzle openings (52a, 52c) for providing fluid communication between the channel and a spool, wherein in a first axial position of the member the first nozzle opening is at least substantially obstructed by the first surface and the second nozzle opening is at least substantially unobstructed by the second surface, and in a second axial position of the member the second nozzle opening is at least substantially obstructed by the second surface and the first nozzle opening is at least substantially unobstructed by the first surface. a valve housing; a cavity formed in the valve housing and defining a longitudinal axis; a member disposed in the cavity and axially moveable therein along said longitudinal axis, wherein the member comprises: first and second cavity sealing sections (60a, 60b) having first and second cross-sectional areas, for engaging an inner surface of the valve housing defining the cavity; first and second obstructing sections (61a, 61b) arranged between the first and second cavity sealing sections (60a, 60b); a middle portion located between the first and second obstructing sections (61a, 61b) and having a third cross-sectional area smaller than both the first and second cross-sectional areas so as to form a channel within the cavity bounded by the first and second obstructing sections (61a, 61b), and first and second surfaces (64a, 64b) formed respectively on the first and second obstructing sections (61a, 61b) arranged parallel to the direction of the longitudinal axis; and first and second cavity sealing sections (60a, 60b) having first and second cross-sectional areas, for engaging an inner surface of the valve housing defining the cavity; first and second obstructing sections (61a, 61b) arranged between the first and second cavity sealing sections (60a, 60b); a middle portion located between the first and second obstructing sections (61a, 61b) and having a third cross-sectional area smaller than both the first and second cross-sectional areas so as to form a channel within the cavity bounded by the first and second obstructing sections (61a, 61b), and first and second surfaces (64a, 64b) formed respectively on the first and second obstructing sections (61a, 61b) arranged parallel to the direction of the longitudinal axis; and a plurality of ports (48a, 48b, 48c), each forming a fluid passage through the valve housing in fluid communication with the channel, the plurality of ports (48a, 48b, 48c) comprising first and second ports (48a, 48c), characterised in that: the first and second obstructing sections (61a, 61b) are first and second nozzle obstructing sections, and the first and second ports (48a, 48c) have first and second nozzles (50a, 50c) with first and second nozzle openings (52a, 52c) for providing fluid communication between the channel and a spool, wherein in a first axial position of the member the first nozzle opening is at least substantially obstructed by the first surface and the second nozzle opening is at least substantially unobstructed by the second surface, and in a second axial position of the member the second nozzle opening is at least substantially obstructed by the second surface and the first nozzle opening is at least substantially unobstructed by the first surface.