A safety valve with extension springs. In a described embodiment, a valve for use in a subterranean well includes a closure member having open and closed positions. A structure displaces to cause the closure member to displace between the open and closed positions. A biasing device has a length whic
A safety valve with extension springs. In a described embodiment, a valve for use in a subterranean well includes a closure member having open and closed positions. A structure displaces to cause the closure member to displace between the open and closed positions. A biasing device has a length which decreases as the structure displaces to cause the closure member to displace toward the closed position.
대표청구항▼
What is claimed is: 1. A valve for use in a subterranean well, the valve comprising: a housing assembly; a closure member having open and closed positions; a tubular structure which displaces to cause the closure member to displace between the open and closed positions; and a biasing device having
What is claimed is: 1. A valve for use in a subterranean well, the valve comprising: a housing assembly; a closure member having open and closed positions; a tubular structure which displaces to cause the closure member to displace between the open and closed positions; and a biasing device having a length which decreases as the structure displaces to cause the closure member to displace toward the closed position, the biasing device being attached at one end thereof to the structure and at another end thereof to the housing assembly, and the biasing device thereby applying to the structure and the housing assembly a biasing force which increases as the length of the biasing device increases. 2. The valve of claim 1, further comprising a flow passage extending generally longitudinally through the valve, the flow passage extending through the structure. 3. The valve of claim 1, wherein the closure member is a flapper pivotably received in the housing assembly of the valve. 4. The valve of claim 1, wherein the biasing device is an extension spring. 5. The valve of claim 1, wherein multiple biasing devices are circumferentially distributed in the housing assembly of the valve. 6. The valve of claim 5, wherein each of the biasing devices is received in a respective one of multiple openings formed in a sidewall of the housing assembly. 7. A valve for use in a subterranean well, the valve comprising: a housing assembly; a closure member having open and closed positions; a structure which displaces to cause the closure member to displace between the open and closed positions, the structure comprising a flow tube reciprocably received in the housing assembly of the valve; and a biasing device having a length which decreases as the structure displaces to cause the closure member to displace toward the closed position, the biasing device being attached at one end thereof to the structure and at another end thereof to the housing assembly, and the biasing device thereby applying to the structure and the housing assembly a biasing force which increases as the length of the biasing device increases. 8. A valve for use in a subterranean well, the valve comprising: a housing assembly; a closure member having open and closed positions; a structure which displaces to cause the closure member to displace between the open and closed positions; a biasing device having a length which decreases as the structure displaces to cause the closure member to displace toward the closed position, the biasing device being attached at one end thereof to the structure and at another end thereof to the housing assembly, and the biasing device thereby applying to the structure and the housing assembly a biasing force which increases as the length of the biasing device increases; and a piston attached to the structure, a pressure differential across the piston being operative to increase the biasing device length. 9. The valve of claim 8, wherein the piston and the biasing device are disposed in a generally tubular housing assembly sidewall at a same longitudinal position. 10. A safety valve for use in a subterranean well, the safety valve comprising: a housing assembly; a closure member having open and closed positions; a structure which is operative to displace the closure member between the open and closed positions; and multiple extension springs which bias the structure to displace the closure member toward the closed position, each spring being attached at one end thereof to the structure and at another end thereof to the housing assembly, and each spring thereby applying to the structure and the housing assembly a biasing force which increases as a length of each spring increases. 11. The safety valve of claim 10, wherein the length of each extension spring decreases when the structure displaces the closure member toward the closed position. 12. The safety valve of claim 10, wherein each extension spring is disposed in a sidewall of the housing assembly of the safety valve. 13. The safety valve of claim 12, wherein each extension spring is positioned in an opening formed in the housing assembly sidewall. 14. The safety valve of claim 12, wherein the extension springs are circumferentially distributed in the housing assembly sidewall. 15. The safety valve of claim 10, wherein an end of each extension spring encircles a cylindrical member attached to one of the structure and the housing assembly. 16. The safety valve of claim 10, wherein an end of each extension spring is attached between a threaded end of a fastener and a head of the fastener. 17. The safety valve of claim 16, wherein a longitudinal axis of the fastener is inline with a longitudinal axis of the respective extension spring. 18. The safety valve of claim 16, wherein a longitudinal axis of the fastener is perpendicular to a longitudinal axis of the respective extension spring. 19. The safety valve of claim 16, wherein the end of the respective extension spring is compressed between the head of the fastener and one of the structure and the housing assembly. 20. A safety valve for use in a subterranean well, the safety valve comprising: a housing assembly; a closure member having open and closed positions; a structure which is operative to displace the closure member between the open and closed positions, the structure comprising a flow tube, and wherein a longitudinal flow passage of the safety valve extends through the flow tube; and at least one extension spring which biases the structure to displace the closure member toward the closed position, the spring being attached at one end thereof to the structure and at another end thereof to the housing assembly, and the spring thereby applying to the structure and the housing assembly a biasing force which increases as a length of the spring increases. 21. The safety valve of claim 20, wherein the closure member is a flapper, and wherein the flow tube pivots the flapper away from a seat encircling the flow passage when the flow tube displaces the flapper toward the open position. 22. The safety valve of claim 21, wherein the extension spring elongates when the flow tube displaces the flapper toward the open position. 23. A safety valve for use in a subterranean well, the safety valve comprising: a housing assembly; a closure member having open and closed positions; a structure which displaces to thereby displace the closure member between the open and closed positions; and multiple biasing devices which bias the structure in a direction to thereby displace the closure member toward the closed position, a length of each biasing device decreasing as the structure displaces in the direction, each biasing device being attached at one end thereof to the structure and at another end thereof to the housing assembly, and each biasing device thereby applying to the structure and the housing assembly a biasing force which increases as the length of each biasing device increases. 24. The safety valve of claim 23, wherein the closure member displaces toward the closed position when the structure displaces in the direction. 25. The safety valve of claim 23, wherein each biasing device is disposed in a sidewall of the housing assembly of the safety valve. 26. The safety valve of claim 25, wherein each biasing device is positioned in an opening formed in the housing assembly sidewall. 27. The safety valve of claim 26, wherein the biasing devices are circumferentially distributed in the housing assembly sidewall. 28. The safety valve of claim 23, wherein the structure comprises a flow tube, and wherein a longitudinal flow passage of the safety valve extends through the flow tube. 29. The safety valve of claim 28, wherein the closure member is a flapper, and wherein the flow tube pivots the flapper away from a seat encircling the flow passage when the flow tube displaces the flapper toward the open position. 30. The safety valve of claim 29, wherein each biasing device elongates when the flow tube displaces the flapper toward the open position. 31. A safety valve for use in a subterranean well, the safety valve comprising: a housing assembly; a closure member having open and closed positions; a structure which displaces to thereby displace the closure member between the open and closed positions; a first biasing device which biases the structure in a direction to thereby displace the closure member toward the closed position, a length of the first biasing device decreasing as the structure displaces in the direction, the first biasing device being attached at one end thereof to the structure and at another end thereof to the housing assembly, and the first biasing device thereby applying to the structure and the housing assembly a biasing force which increases as the length of the first biasing device increases; and a second biasing device which biases the structure in the direction, a length of the second biasing device increasing as the structure displaces in the direction.
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이 특허에 인용된 특허 (11)
Trott, Douglas; Shaw, Brian; McMahon, David, Closure mechanism with integrated actuator for subsurface valves.
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