Abstract: A flow controller device for controlling a fluid flow between a petroleum reservoir and a pipe body is described. The fluid flow is carried through a flow restriction. A pressure-controlled actuator is connected to a valve body that cooperates with a valve opening. The valve opening is connected in series subsequent to the flow restriction. A closing side of the actuator communicates with fluid located upstream of the flow restriction. An opening side of the actuator communicates with a fluid located downstream of the flow restriction and upstream of the valve opening.