Flow control device

Abstract

24472958_1 (GHMatters) P123732.AU.1 ABSTRACT: Described is a flow control device, comprising; a body locatable within a wall of a tubular and defining a primary inlet and a primary outlet, wherein a primary flow path is defined between the primary inlet and primary outlet; a valve member disposed within 5 the body, the valve member being moveable in reverse first and second directions to selectively vary a flow area of the primary flow path, wherein movement of the valve member in the first direction moves the valve member towards a fully open position, increasing the flow area, and movement of the valve member in the second direction moves the valve member towards a fully closed position, decreasing the flow area, 10 wherein the primary flow path is configured such that a fluid pressure at the primary inlet is communicated to the valve member to bias the valve member towards the fully open position, and a fluid pressure at the primary outlet is communicated to the valve member to bias the valve member towards the fully closed position; and, a sealed pilot pressure chamber defining a pilot pressure inlet for receiving a pilot pressure, the valve 15 member being in pressure communication with the sealed pilot pressure chamber such that pilot pressure may act to bias the valve member in the second direction, wherein the pilot pressure is provided as a function of a property of fluid flowing through the primary flow path, wherein when the fluid pressure at the primary outlet provides a biasing force on the valve member that is greater than a biasing force on the valve 20 member provided by a fluid pressure at the primary inlet, the pressure differential across the valve member is such that it is biased towards the fully closed position. [Figure 1] 25 ABSTRACT: 10 15 20 25 20 26 21 68 24 13 A ug 2 02 6 A B S T R A C T : 2 0 2 6 2 1 6 8 2 4 1 3 2 0 2 6 A u g 1 0 1 5 2 0 2 5 54158931-1 FIG. 1 FIG. 2 10 1620 12 40 32 14 50 30 18 14 60 70 72 74 10 70 78 34 1 / 9 12 34 18 32 30 14 14 40 70 10 FIG. 2 54158931-1 20 26 21 68 24 13 A ug 2 02 6 1 / 9 1 3 A u g 2 0 2 6 2 0 2 6 2 1 6 8 2 4 1 2 1 0 1 4 7 0 1 0 F I G . 2

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