An actuator (1) is provided for controlling a valve having a valve rod. The actuator comprises an actuator spindle (3) adapted to control the movement of the valve rod. The actuator also comprises a manual override arrangement for manually moving said actuator spindle, said manual override arrangement comprising:
a first element (12) having a through hole (14) for receiving a tool (16), a second element (18) operatively connected to said actuator spindle and having a receiving hole (20) for receiving the tool (16). The first element is movable from a non-aligned first position to a second position in which the through hole and the receiving hole are aligned. In the second position a tool may extend through said through hole and into said receiving hole in order to rotate said second element for transferring the rotation to said actuator spindle.