A check valve assembly (100, 200) is provided for subsea applications. The check valve assembly comprises a housing (102, 202), having an inlet port (106, 206) and an outlet port (108, 208) forming an internal fluid passageway through the housing; a valve member (112, 212), moveable within the inter
A check valve assembly (100, 200) is provided for subsea applications. The check valve assembly comprises a housing (102, 202), having an inlet port (106, 206) and an outlet port (108, 208) forming an internal fluid passageway through the housing; a valve member (112, 212), moveable within the internal fluid passageway between a first position, where fluid flow through the internal fluid passageway is prevented, and a second position, where fluid flow through the internal fluid passageway is permitted; a biasing member (110, 210), adapted to urge the valve member into the first position at a predetermined cracking force, and a pressure interface (116, 216). The pressure interface operatively links the valve member and an external fluid of a region exterior of the check valve assembly so as to provide a supplemental force, proportional to the ambient pressure of the external fluid, adapted to urge the valve member towards the first position.
대표청구항▼
1. A subsea check valve assembly for subsea applications, comprising: a housing, having an inlet port and an outlet port forming an internal fluid passageway through said housing between the inlet port and the outlet port;a valve member comprising a first upstream surface in fluid communication with
1. A subsea check valve assembly for subsea applications, comprising: a housing, having an inlet port and an outlet port forming an internal fluid passageway through said housing between the inlet port and the outlet port;a valve member comprising a first upstream surface in fluid communication with the inlet port and a second downstream surface, the valve member being moveable within said internal fluid passageway between a first position, where fluid flow through said internal fluid passageway is prevented, and a second position, where fluid flow through said internal fluid passageway is permitted;a biasing member, in contact with at least part of said second downstream surface and adapted to urge said valve member into said first position at a predetermined cracking force, anda pressure interface to provide a supplemental force to urge said valve member towards said first position, wherein the pressure interface comprises at least one external fluid passageway adapted to provide direct fluid communication between an external fluid located in a region exterior of the subsea check valve and at least part of said second downstream surface, wherein the supplemental force is proportional to the ambient pressure of said external fluid located in the region exterior of the subsea check valve. 2. A subsea check valve assembly according to claim 1, further comprising a valve seat surface formed within said internal fluid passageway coaxially about said inlet port. 3. A subsea check valve assembly according to claim 2, wherein said first upstream surface of said valve member is adapted to sealingly engage said valve seat surface when in said first position. 4. A subsea check valve assembly according to claim 3, wherein said second downstream surface is located at an opposing side to said first upstream surface. 5. A subsea check valve assembly according to claim 1, wherein said at least one external fluid passageway is fluidly sealed from said internal fluid passageway. 6. A subsea check valve assembly according to claim 1, wherein said valve member further comprises a seal portion and at least one flow portion at an upstream side of said valve member, the seal portion being engageable with said housing to prevent fluid flow past said seal portion, and wherein said flow portion is adapted to provide a fluid path between said inlet port and said outlet port through said internal fluid passageway. 7. A subsea check valve assembly according to claim 6, wherein said seal portion sealingly closes said fluid path of said flow portion when said valve member is in said first position, and wherein said flow portion provides fluid flow through said fluid path when said valve member is in said second position. 8. A subsea check valve assembly according to claim 1, wherein said biasing member is a spring. 9. A subsea check valve assembly according to claim 1, further comprising a snap-action mechanism adapted to independently move said valve member into said first position and/or said second position at a predetermined condition. 10. A subsea check valve assembly according to claim 9, wherein said predetermined condition is a predetermined distance between the valve member and said first position and/or said second position. 11. A subsea check valve assembly according to claim 9, wherein said snap-action mechanism comprises at least one magnetic element adapted to provide a force acting on said valve member so as to urge said valve member towards said first position and/or said second position. 12. A stab connector for providing a fluid flow path between a first fluid reservoir and a second fluid reservoir, comprising: a stab body coupleable to a receptacle in fluid communication with the second fluid reservoir, anda subsea check valve assembly according to claim 1, operatively arranged within said stab body and adapted to control fluid flow between the first fluid reservoir and the second fluid reservoir. 13. A stab connector according to claim 12, wherein the pressure interface of said subsea check valve assembly is arranged within the distal end portion of said stab body.
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