Fluid flow device that provides a seal by exploiting differential thermal expansion
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F16J-015/02
F16K-025/00
F16K-003/24
F16K-003/26
F16K-027/04
F16K-039/04
F16K-003/32
F16K-047/02
출원번호
US-0057621
(2013-10-18)
등록번호
US-9395009
(2016-07-19)
발명자
/ 주소
Lovell, Michel K.
출원인 / 주소
FISHER CONTROLS INTERNATIONAL LLC
대리인 / 주소
Marshall, Gerstein & Borun LLP
인용정보
피인용 횟수 :
0인용 특허 :
6
초록▼
A fluid flow control device includes a valve body, a valve seat disposed within the valve body, and a valve cage coupled to the valve seat within the valve body. The fluid flow control device also includes a gland defined by the valve body, the valve seat, and the valve cage. The valve body has a fi
A fluid flow control device includes a valve body, a valve seat disposed within the valve body, and a valve cage coupled to the valve seat within the valve body. The fluid flow control device also includes a gland defined by the valve body, the valve seat, and the valve cage. The valve body has a first thermal expansion coefficient and the valve seat and/or the valve cage have a second thermal expansion coefficient different from the first thermal expansion coefficient. The fluid flow control device further includes a sealing assembly disposed within the fluid flow control device to provide a seal between the valve body and the valve cage. The sealing assembly exploits differential thermal expansion between the valve body and the valve cage in a direction parallel to the longitudinal axis and in a direction transverse to the longitudinal axis to improve the seal.
대표청구항▼
1. A fluid flow control device comprising: a valve body defining an inlet, an outlet, a fluid flow path extending between the inlet and the outlet, and a longitudinal axis, the valve body having a first thermal expansion coefficient;a valve seat disposed within the valve body and defining an orifice
1. A fluid flow control device comprising: a valve body defining an inlet, an outlet, a fluid flow path extending between the inlet and the outlet, and a longitudinal axis, the valve body having a first thermal expansion coefficient;a valve seat disposed within the valve body and defining an orifice through which the fluid flow path passes;a valve cage coupled to the valve seat within the valve body and defining an interior bore, the cage having a second thermal expansion coefficient different than the first thermal expansion coefficient;a valve plug sized for insertion into the interior bore of the valve cage and movable along an axis between a closed position, in which the valve plug engages the valve seat, and an open position;a gland defined by at least one of the valve seat and the valve cage; anda sealing assembly arranged within the gland to provide a seal between the valve body and the valve cage, the sealing assembly comprising a seal portion and a biasing element disposed immediately adjacent the seal portion, and the sealing assembly arranged in a first compression state in which the sealing assembly provides first radial and axial compression forces, the sealing assembly movable to a second compression state in which the sealing assembly provides second radial and axial compression forces greater than the first radial and axial compression forces, the movement of the sealing assembly being due to differential thermal expansion between the valve body and the valve cage in an axial direction that is parallel to the longitudinal axis and in a radial direction that is transverse to the longitudinal axis,wherein the biasing element comprises a gasket and the seal portion has a thermal expansion coefficient equal to the first or second thermal expansion coefficient, andwherein the gasket is disposed in contact with the seal portion, the gasket configured to provide the first and second radial compression forces to the seal portion to bias the seal portion outward against the valve body to provide the seal between the valve body and the valve cage. 2. The fluid flow control device of claim 1, wherein the valve seat and the valve cage are bolted together via a plurality of screws. 3. The fluid flow control device of claim 1, wherein the valve seat and the valve cage are threaded together. 4. The fluid flow control device of claim 1, wherein the sealing assembly is arranged within the gland such that a radial gap is formed between the valve cage and the seal portion of the sealing assembly, the radial gap being substantially closed when the sealing assembly moves to the second compression state. 5. The fluid flow control device of claim 1 wherein the seal portion is made of the same material as the valve body. 6. The fluid flow control device of claim 1 wherein the gasket is disposed radially inward of the seal portion within the gland. 7. The fluid flow control device of claim 1, wherein the gasket comprises a first gasket and the sealing assembly further comprises a second gasket, the first gasket being disposed immediately adjacent the seal portion, and the second gasket being disposed between the valve seat and the valve cage. 8. The fluid flow control device of claim 1, wherein the sealing assembly further comprises a seal retainer. 9. The fluid flow control device of claim 8, wherein the seal retainer is positioned between the valve seat and the valve body and immediately adjacent the seal portion and the gasket. 10. The fluid flow control device of claim 1, wherein the fluid flow control device is configured for operation at a service temperature of between approximately 450 degrees Fahrenheit and approximately 1100 degrees Fahrenheit. 11. The fluid flow control device of claim 1, wherein the seal portion comprises a first seal portion, the sealing assembly further comprising a second seal portion, a third seal portion, and a fourth seal portion, and wherein the biasing element comprises a first wound gasket, the sealing assembly further comprising a second wound gasket, the first and second seal portions being disposed adjacent the valve body and having a thermal expansion coefficient equal to the first thermal expansion coefficient, the third and fourth seal portions being disposed adjacent the valve cage and having a thermal expansion coefficient equal to the second thermal expansion coefficient, and the first wound gasket being disposed between the first and third seal portions and the second wound gasket disposed between the second and fourth seal portions such that the first wound gasket is configured to provide the first and second radial compression forces to the first and third seal portions to bias the first seal portion toward the valve cage and bias the third seal portion toward the valve body, and the second wound gasket is configured to provide the first and second radial compression forces to the second and fourth seal portions to bias the second seal portion toward the valve cage and bias the fourth seal portion toward the valve body. 12. A fluid flow control device comprising: a valve body defining an inlet, an outlet, a fluid flow path extending between the inlet and the outlet, and a longitudinal axis, the valve body having a first thermal expansion coefficient;a valve seat disposed within the valve body and defining an orifice through which the fluid flow path passes;a valve cage coupled to the valve seat within the valve body and defining an interior bore, the cage having a second thermal expansion coefficient different than the first thermal expansion coefficient;a valve plug sized for insertion into the interior bore of the valve cage and movable along an axis between a closed position, in which the valve plug engages the valve seat, and an open position;a gland defined by at least one of the valve seat and the valve cage; anda sealing assembly arranged within the gland to provide a seal between the valve body and the valve cage, the sealing assembly comprising at least one seal portion and at least one biasing element disposed immediately adjacent the at least one seal portion, and the sealing assembly arranged in a first compression state in which the sealing assembly provides first radial and axial compression forces, the sealing assembly movable to a second compression state in which the sealing assembly provides second radial and axial compression forces greater than the first radial and axial compression forces, the movement of the sealing assembly being due to differential thermal expansion between the valve body and the valve cage in an axial direction that is parallel to the longitudinal axis and in a radial direction that is transverse to the longitudinal axis,wherein the least one seal portion comprises a first seal portion, a second seal portion, a third seal portion, and a fourth seal portion, and wherein the at least one biasing element comprises first and second wound gaskets, the first and second seal portions being disposed adjacent the valve body and having a thermal expansion coefficient equal to the first thermal expansion coefficient, the third and fourth seal portions being disposed adjacent the valve cage and having a thermal expansion coefficient equal to the second thermal expansion coefficient, and the first wound gasket being disposed between the first and third seal portions and the second wound gasket disposed between the second and fourth seal portions such that the first wound gasket is configured to provide the first and second radial compression forces to the first and third seal portions to bias the first seal portion toward the valve cage and bias the third seal portion toward the valve body, and the second wound gasket is configured to provide the first and second radial compression forces to the second and fourth seal portions to bias the second seal portion toward the valve cage and bias the fourth seal portion toward the valve body. 13. The fluid flow control device of claim 12, wherein the first and second seal portions are made of the same material as the valve cage, and wherein the third and fourth seal portions are made of the same material as the valve body. 14. The fluid flow control device of claim 12, wherein the sealing assembly further comprises a packing ring disposed between the first and second wound gaskets. 15. A fluid flow control device comprising: a valve body defining an inlet, an outlet, a fluid flow path extending between the inlet and the outlet, and a longitudinal axis, the valve body having a first thermal expansion coefficient;a valve seat disposed within the valve body and defining an orifice through which the fluid flow path passes;a valve cage coupled to the valve seat within the valve body and defining an interior bore, the cage having a second thermal expansion coefficient different than the first thermal expansion coefficient;a valve plug sized for insertion into the interior bore of the valve cage and movable along an axis between a closed position, in which the valve plug engages the valve seat, and an open position;a sealing assembly disposed within the fluid flow control device to affect a seal between the valve cage and the valve body, the sealing assembly having a biasing element and a sealing portion disposed adjacent to the biasing element, the sealing assembly being arranged in a first compression state in which the biasing element applies a first radial compression force to the sealing portion to bias the sealing portion toward the valve body, the sealing assembly movable to a second compression state in which the biasing element applies a second radial compression force, greater than the first radial compression force, to the sealing portion to bias the sealing portion toward the valve body, the movement of the sealing assembly being due to differential thermal expansion between the valve body and the valve cage in a direction parallel to the longitudinal axis and in a direction transverse to the longitudinal axis,wherein the biasing element comprises a spiral wound gasket and the sealing portion has a thermal expansion coefficient equal to the first thermal expansion coefficient. 16. The fluid flow control device of claim 15, wherein the biasing element is disposed radially inward of the sealing portion. 17. The fluid flow control device of claim 15, wherein the sealing assembly further comprises a sealing retainer configured to compress the biasing element. 18. The fluid flow control device of claim 17, wherein the sealing retainer is disposed between the valve seat and the valve body and immediately adjacent the biasing element. 19. The fluid flow control device of claim 15, wherein the sealing portion comprises a first sealing portion, wherein the sealing assembly has a second sealing portion, a third sealing portion, and a fourth sealing portion, the first and second sealing portions being disposed adjacent the valve body and the second sealing portion having a thermal expansion coefficient equal to the first thermal expansion coefficient, the third and fourth sealing portions being disposed adjacent the valve cage and having a thermal expansion coefficient equal to the second thermal expansion coefficient, andwherein the spiral wound gasket comprises a first spiral wound gasket and the sealing assembly further comprises a second spiral wound gasket, the first spiral wound gasket being disposed between the first and third sealing portions and the second spiral wound gasket being disposed between the second and fourth sealing portions such that the first spiral wound gasket is configured to apply the first radial compression force to the first and third seal portions to bias the first seal portion toward the valve body and to bias the third seal portion toward the valve cage, and the second spiral wound gasket is configured to apply the second radial compression forces to the second and fourth seal portions to bias the second seal portion toward the valve body and to bias the fourth sealing portion toward the valve cage. 20. A sealing assembly for a fluid control device having a valve body, a valve seat, and a valve cage, the valve body being made of a first material having a first thermal expansion coefficient, and the valve cage or the valve seat being made of a second material having a second thermal expansion coefficient different from the first thermal expansion coefficient, the sealing assembly comprising: a biasing element; andat least one sealing portion disposed adjacent to the biasing element, the at least one sealing portion being made from the same material as the valve body,wherein the sealing assembly is arranged in a first compression state in which the biasing element applies a first radial compression force to the at least one sealing portion to bias the at least one sealing portion toward the valve body to affect a seal between the valve cage and the valve body, wherein the sealing assembly is movable to a second compression state in which the biasing element applies a second radial compression force, greater than the first radial compression force, to the at least one sealing portion to bias the at least one sealing portion toward the valve body to affect the seal between the valve cage and the valve body, and wherein movement of the sealing assembly is due to differential thermal expansion between the valve body and the valve cage or the valve seat in a direction parallel to the longitudinal axis and in a direction transverse to the longitudinal axis. 21. The sealing assembly of claim 20, wherein the biasing element is configured to bias the at least one sealing portion into contact with the valve body to affect the seal. 22. The sealing assembly of claim 20, wherein the biasing element comprises a spiral wound gasket. 23. The sealing assembly of claim 20, wherein the biasing element is disposed radially inward of the sealing portion. 24. The sealing assembly of claim 20, further comprising a sealing retainer configured to compress the biasing element. 25. The sealing assembly of claim 24, wherein the sealing retainer is disposed between the valve seat and the valve body and immediately adjacent the biasing element. 26. The sealing assembly of claim 20, wherein the at least one sealing portion comprises a first sealing portion, the sealing assembly further comprising a second sealing portion, a third sealing portion, and a fourth sealing portion, the first and second sealing portions being disposed adjacent the valve body and the second sealing portion having a thermal expansion coefficient equal to the first thermal expansion coefficient, the third and fourth sealing portions being disposed adjacent the valve cage and having a thermal expansion coefficient equal to the second thermal expansion coefficient, and wherein the biasing element comprises a first spiral wound gasket and the sealing assembly further comprises a second spiral wound gasket, the first spiral wound gasket being disposed between the first and third sealing portions and the second spiral wound gasket being disposed between the second and fourth sealing portions such that the first spiral wound gasket is configured to apply the first and second radial compression forces to the first and third sealing portions to bias the first sealing portion toward the valve body and to bias the third sealing against the valve cage and the second spiral wound gasket is configured to apply the first and second radial compression forces to the second and fourth sealing portions to bias the second sealing portion toward the valve body and to bias the fourth sealing portion against the valve cage. 27. The sealing assembly of claim 20 wherein the sealing assembly is configured for operation at a temperature of between approximately 450 degrees Fahrenheit and approximately 1100 degrees Fahrenheit.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (6)
McCrone James A. (Columbia SC), Bimetallic C-ring seal.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.