Abstract: An improved autonomous well valve has a body that constitutes an actuator for opening and closing of first and second valves. The body has a body axis of symmetry. The body, which in operation is submerged, has an effective density that is equal or greater than the density of a first fluid and less than the density of a second fluid. The body is placed in a housing, the housing having a housing axis of symmetry. At least two first valves are designed to allow flow between the inside and outside of the housing, are distributed about the body axis and mechanically connected between the body and the housing. The body axis at the first valves is restricted from moving above the housing axis.

Abstract: An autonomous well valve having a body that constitutes an actuator for opening and closing at least one first valve opening, wherein the body, that in operation is submerged, has an effective density that is equal or greater than the density of a first fluid and less than the density of a second fluid.

Abstract: An autonomous well valve having a body that constitutes an actuator for opening and closing at least one first valve opening, wherein the body, that in operation is submerged, has an effective density that is equal or greater than the density of a first fluid and less than the density of a second fluid.

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.

Abstract: A flow controller device (50) for controlling a fluid flow between a petroleum reservoir (6) and a pipe body (2), in which the fluid flow is carried through a flow restriction (18), and a pressure-controlled actuator (30) is connected to a valve body (24) cooperating with a valve opening (20) connected in series relative to the flow restriction (18), wherein the actuator (30), on a closing side (34) thereof, communicates with fluid located upstream of the valve opening (20) and the flow restriction (18), and wherein the actuator (30), on an opening side (40) thereof, communicates with a fluid located downstream of the flow restriction (18) and upstream of the valve opening (20).