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US 7,597,149 B2Granted
Safety valve with extension springs
AssigneeHalliburton Energy Services, Inc.
InventorsJimmie R. Williamson, Jr., James D. Vick, Jr., Abram Galindo
Life of this patent
Estimating the term…
Abstract
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.
Claims31
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 more elements
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.
2 more elements
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.
3 more elements
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.
2 more elements
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.
2 more elements
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.
2 more elements
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.
3 more elements
Dependencies are inferred from the claim text.