Autonomous valve with temperature responsive device

A self-adjustable valve for controlling the flow of a fluid from one space or area to another by exploiting the Bernoulli principle, to control the flow of fluid from an oil or gas reservoir and into a production pipe of a well in the oil and/or gas reservoir, from an inlet port on an inlet side to an outlet port on an outlet side of the device, the valve comprising the inlet port and the outlet port, wherein the valve comprises a movable valve body arranged to be acted on by a temperature responsive device, and wherein the moveable valve body is arranged to be actuated towards a closed position by the temperature responsive device in response to a predetermined increase in temperature in the fluid surrounding and/or entering the valve, said closed position being to prevent the flow of the fluid to the outlet port,

• wherein the moveable valve body is arranged to be freely moveable by the Bernoulli effect to perform said controlling the flow when not actuated to the closed position by the temperature responsive device,
• wherein the temperature responsive device comprises an expandable structure comprising a sealed structure at least partially filled with an expandable material, wherein said expandable material and hence also said expandable structure are arranged to expand and cause a displacement of the movable valve body towards its closed position when the temperature of the fluid exceeds a predetermined temperature,
• wherein the self-adjustable valve has a flow path from the inlet port to the outlet port via a flow path portion to guide flow of the fluid over a surface of the movable valve body to thereby, when the moveable valve body is not actuated to the closed position by the temperature responsive device and is freely movable, autonomously move the moveable valve body to control said flow by exploiting the Bernoulli principle,
• wherein the expandable structure is arranged in a fluid chamber in the valve, which chamber contains the movable valve body to control the fluid flow through the valve, and
• wherein the expandable structure is either one of:
• attached to a portion of the fluid chamber and expandable into contact with said movable valve body;
• or
• attached to the movable valve body and expandable into contact with said fluid chamber.