SERVOVALVE

A servovalve comprising: a fluid transfer valve assembly comprising a supply port and a control port; a moveable valve spool (2) arranged to regulate flow of fluid from the supply port to the control port in response to a control signal; and a drive assembly configured to axially move the valve spool relative to the fluid transfer assembly in response to the control signal to regulate the fluid flow; wherein the drive assembly comprises a first fluid channel (11') providing a flow path for fluid from the supply port to a first end of the spool (2) and provided with a first flow control orifice (20), a second fluid channel (12') providing a flow path for fluid from the supply port to a second end of the spool (2) and provided with a second flow control orifice (21) and a rotating element (8) provided with a cam profile, located between the first flow control orifice and the second flow control orifice, and drive means (17) arranged to rotate the rotating element (8) to vary the rotational position of the cam profile with respect to the first and second flow control orifice, in response to the control signal, to control flow from the first and second flow control orifice and this to control movement of the valve spool (2).