Flapper servo valve

A servo valve comprising:

• a fluid transfer valve assembly comprising a valve body having a supply port and a control port (C1);
• the valve body comprising first and second nozzles and a drive member therebetween, arranged to regulate flow of fluid from the supply port to the control port in response to a control signal;
• and
• a drive assembly comprising a magnetic coil and a core passing through the coil and configured to move axially with respect to the coil when the coil is powered by a current dependent on the control signal, the drive assembly arranged to move the drive member relative to the first and second nozzles in response to the control signal,
• wherein the drive member comprises an elongate flapper member having a first end located between the first nozzle and the second nozzle and a second end received in the core of the drive assembly, such that axial movement of the core causes side-to-side movement of the end of the drive member between the nozzles such as to vary the spacing (A, B) between the end and at least one of the nozzles as the end moves relative to the first and second nozzles.