Flow rate controller for high flow rates and high pressure drops
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G05D-007/01
F16K-039/02
F16K-047/04
출원번호
US-0732562
(2015-06-05)
등록번호
US-9488989
(2016-11-08)
발명자
/ 주소
Kirchner, Mark W.
Jones, Gilbert
출원인 / 주소
Sko Flo Industries, Inc.
대리인 / 주소
Perkins Coie LLP
인용정보
피인용 횟수 :
0인용 특허 :
18
초록▼
A flow rate controller is disclosed that maintains constant flow rate with changes in pressure drop across the valve by maintaining a constant pressure drop across a restrictor with the aid of a spring balanced piston that mates a cone to a seat to dissipate the majority of pressure drop across the
A flow rate controller is disclosed that maintains constant flow rate with changes in pressure drop across the valve by maintaining a constant pressure drop across a restrictor with the aid of a spring balanced piston that mates a cone to a seat to dissipate the majority of pressure drop across the valve.
대표청구항▼
1. A pressure-independent flow rate controller assembly, comprising: a flow inlet and a flow outlet through which fluid flows, wherein fluid pressure at the flow inlet is an inlet pressure (P1) and the fluid pressure at the flow outlet is an outlet pressure (P3);an interior chamber with first and se
1. A pressure-independent flow rate controller assembly, comprising: a flow inlet and a flow outlet through which fluid flows, wherein fluid pressure at the flow inlet is an inlet pressure (P1) and the fluid pressure at the flow outlet is an outlet pressure (P3);an interior chamber with first and second chamber portions and a balance channel adjacent to the second chamber portion;an intermediate passageway interconnecting the flow outlet to the first chamber portion;a spring-biased piston slideably disposed in the interior chamber and having first and second piston portions axially spaced apart from each other by an intermediate space therebetween, wherein fluid is blocked from moving relative to the piston between the first chamber portion and the intermediate space and from moving relative to the piston between the intermediate space and the second chamber portion, and wherein the pressure of the fluid in the intermediate space being substantially at the outlet pressure (P3);a first throttling assembly having a first throttling seat with a throttling channel that receives fluid substantially at the inlet pressure (P1), the throttling channel configured to direct fluid toward the first chamber portion, and the first throttling assembly having a first throttling member coupled to the first chamber portion and to the piston, the first throttling member having an end portion shaped to mate with the throttling seat, the end portion having a first area against which fluid at the inlet pressure (P1) acts, the first throttling member being movable relative to the throttling seat to allow the fluid to flow into the first chamber portion, wherein fluid in the first chamber portion and in the intermediate passageway is at an intermediate pressure (P2) less than the inlet pressure (P1) and greater than the outlet pressure (P3), and wherein the intermediate passageway is in fluid communication with the second chamber portion and fluid in the second chamber portion is at the intermediate pressure (P2);a balance member coupled to the piston and having a fluid-acting surface with an area substantially equal to the first area of the end portion of the first throttling member, wherein fluid at the inlet pressure (P1) acts on the fluid acting surface to balance the fluid pressure acting on the end portion of the first throttling member;an adjustable restriction assembly configured to allow the fluid from the intermediate passageway to flow at a selected constant flow rate toward the flow outlet at the outlet pressure (P3), wherein the selected constant flow rate is independent of a pressure differential between the outlet pressure (P3) and the inlet pressure (P1); anda second throttling assembly configured to receive the flow of fluid from the adjustable restriction assembly, the second throttling assembly having second throttling member coupled to a spring biased piston and having a second throttling seat configured to receive the flow of fluid from the adjustable restriction assembly in an under-then-over trim configuration. 2. The flow rate controller assembly of claim 1, further comprising a pilot passageway interconnecting the flow inlet and the balance channel, wherein fluid in the pilot passageway channel is substantially at the inlet pressure (P1). 3. The flow rate controller assembly of claim 1, further comprising a seal member sealably connected to the first piston portion and blocking fluid from moving past the piston between the first chamber portion and the intermediate space. 4. The flow rate controller assembly of claim 1, further comprising a seal member sealably connected to the second piston portion and blocking fluid from moving past the piston between the second chamber portion and the intermediate space. 5. The flow rate controller assembly of claim 1, further comprising a first seal member sealably connected to the first piston portion and blocking fluid from moving past the piston between the first chamber portion and the intermediate space, and a second seal member sealably connected to the second piston portion and blocking fluid from moving past the piston between the second chamber portion and the intermediate space. 6. The flow rate controller assembly of claim 1, further comprising a pilot passageway interconnecting the intermediate passageway with the second chamber portion, wherein fluid in the pilot passageway is substantially at the intermediate pressure (P2). 7. The flow rate controller assembly of claim 1, further comprising a pilot channel interconnecting the flow outlet to the intermediate space, wherein fluid in the pilot passageway is substantially at the outlet pressure (P3). 8. The flow rate controller assembly of claim 1 wherein the first throttling member is a throttling cone with a tapered end portion facing the flow of fluid through the first throttling seat, wherein the throttling cone is configured to move away from the first throttling seat upon a sudden increase in the inlet pressure to dissipate the sudden pressure increase with a delayed response. 9. The flow rate controller of claim 1, further comprising a throttle biasing member coupled to the first throttling member and urging the first throttling member toward the first throttling seat, the throttle biasing member being compressible when the first throttling member moves away from the first throttling seat. 10. The flow rate controller assembly of claim 1, further comprising a seal interconnecting a portion of the balance member and the balance channel, the seal separating the fluid in the balance channel at the inlet pressure (P1) from the fluid in the second chamber portion at the intermediate pressure (P2). 11. The flow rate controller assembly of claim 1, further comprising a piston biasing member in the intermediate space between the first and second seal members. 12. The flow rate controller assembly of claim 1 wherein the first piston portion has a first area against which the fluid in the first chamber portion at the intermediate pressure (P2) acts, and the second piston portion has a second area against which the fluid in the second chamber portion at the intermediate pressure (P2) acts, wherein the first area is substantially equal to the second area. 13. A constant rate flow rate controller, comprising: a flow inlet and a flow outlet through which fluid flows, wherein fluid pressure at the flow inlet is an inlet pressure (P1) and the fluid pressure at the flow outlet is an outlet pressure (P3);an interior chamber with first and second chamber portions and a balance channel adjacent to the second chamber portion, the first and second chamber portions being separated by an annular intermediate space containing fluid at the outlet pressure (P3), the first and second chamber portions containing a portion of the fluid at an intermediate pressure (P2), wherein the intermediate pressure (P2) is less than the inlet pressure (P1) and greater than the outlet pressure (P3), wherein fluid is blocked from moving past the first piston portion between the first chamber portion and the annular intermediate space, and wherein fluid is blocked from moving between the annular intermediate space and the second chamber portion;a piston slideably disposed in the interior chamber and having first and second piston portions axially spaced apart from each other, the piston having an internal area containing fluid at the intermediate pressure (P2);an annular piston biasing member in the annular intermediate space and having an outer diameter (D1) and an inner diameter (D2), and the piston biasing member defines an annular area between D1 and D2, the annular piston biasing member balancing the annular areas between D1 and D2 against the forces of the intermediate pressure (P2) acting on the piston and the opposing forces of the outlet pressure (P3) in the internal area acting against the piston;a throttling seat that receives the fluid from the flow inlet substantially at the inlet pressure (P1), and the throttling seat directs fluid to the first chamber portion;a throttling member moveably disposed in the first chamber portion and connected to the piston, the throttling member having an end portion shaped to mate with a portion of the throttling seat, the end portion having a first area against which the fluid acts substantially at the inlet pressure (P1), the throttling member being movable relative to the throttling seat, the throttling member allows the fluid to flow into the first chamber portion at the intermediate pressure (P2);a balance member coupled to the piston and having a portion adjacent to the balance channel and having an fluid-acting surface with an area substantially equal to the first area of the end portion of the throttling member, the balance channel containing a portion of the fluid at the inlet pressure (P1) that acts on the fluid acting surface and balances opposing the fluid pressure at the inlet pressure (P1) acting on the end portion of the throttling member; andan adjustable restriction assembly configured to allow the fluid from the interior chamber to flow at a selected constant flow rate toward the outlet at the outlet pressure (P3), wherein the selected constant flow rate is independent of a pressure differential between the outlet pressure (P3) and the inlet pressure (P1) because of the pressure balance across the area bounded by D1-D2. 14. The flow rate controller of claim 13, further comprising an intermediate passageway interconnecting the flow outlet to the first chamber portion, the intermediate passageway containing a portion of the fluid at the intermediate pressure (P2), and wherein the adjustable restriction assembly receives a flow of fluid from the intermediate passageway. 15. The flow rate controller of claim 13 wherein the throttling member is a first throttling member and the throttling seat is a first throttling seat, and further comprising a throttling assembly configured to receive the flow of fluid from the adjustable restriction assembly, the throttling assembly having second throttling member coupled to a spring-biased piston and having a second throttling seat configured to receive the flow of fluid from the adjustable restriction assembly. 16. The flow rate controller of claim 15 wherein the throttling assembly is configured to receive the flow of fluid relative to the second throttling seat in an under-then-over trim configuration. 17. The flow rate controller of claim 13, further comprising a pilot passageway interconnecting the flow inlet and the balance channel, wherein fluid in the pilot passageway channel is substantially at the inlet pressure (P1). 18. The flow rate controller of claim 13, further comprising a pilot passageway interconnecting the intermediate passageway with the second chamber portion, wherein fluid in the pilot passageway is substantially at the intermediate pressure (P2). 19. The flow rate controller of claim 13, further comprising a pilot passageway interconnecting the flow outlet to the intermediate space, wherein fluid in the pilot passageway is substantially at the outlet pressure (P3). 20. The flow rate controller of claim 13, further comprising a seal member sealably connected to the first piston portion and blocking fluid from moving past the piston between the first chamber portion and the intermediate space. 21. The flow rate controller assembly of claim 13, further comprising a seal member sealably connected to the second piston portion and blocking fluid from moving past the piston between the second chamber portion and the intermediate space. 22. A flow rate controller, comprising: a flow inlet and a flow outlet through which fluid flows, wherein fluid pressure at the flow inlet is an inlet pressure (P1) and the fluid pressure at the flow outlet is an outlet pressure (P3);an interior chamber with first and second chamber portions and a balance channel adjacent to the second chamber portion;a spring-biased piston slideably disposed in the interior chamber and having first and second piston portions axially spaced apart from each other by an intermediate space therebetween, wherein fluid is blocked from moving relative to the piston between the first chamber portion and an intermediate space from moving relative to the piston between the intermediate space and the second chamber portion, and wherein the pressure of the fluid in the intermediate space being substantially at the outlet pressure (P3);a first throttling assembly having a first throttling seat with a throttling channel that receives fluid substantially at the inlet pressure (P1), the throttling channel configured to direct fluid toward the first chamber portion, and the first throttling assembly having a first throttling member coupled to the first chamber portion and to the piston, the first throttling member having an end portion shaped to mate with the throttling seat, the end portion having a first area against which fluid at the inlet pressure (P1) acts, the first throttling member being movable relative to the throttling seat to allow the fluid to flow into the first chamber portion, wherein fluid in the first chamber portion and in the intermediate passageway is at an intermediate pressure (P2) less than the inlet pressure (P1) and greater than the outlet pressure (P3), and wherein the intermediate passageway is in fluid communication with the second chamber portion and fluid in the second chamber portion is at the intermediate pressure (P2);a balance member coupled to the piston and having a fluid-acting surface with an area substantially equal to the first area of the end portion of the first throttling member, wherein fluid at the inlet pressure (P1) acts on the fluid acting surface to balance the fluid pressure acting on the end portion of the first throttling member; andan adjustable restriction assembly configured to allow the fluid from the interior chamber to flow at a selected constant flow rate toward the flow outlet at the outlet pressure (P3), wherein the selected constant flow rate is independent of a pressure differential between the outlet pressure (P3) and the inlet pressure (P1). 23. The flow controller of claim 20, further comprising a plurality of dynamic seals sealably connected to the piston and disposed on opposing ends of the intermediate portion of the interior chamber, wherein fluid between the dynamic seals is at the fluid outlet pressure (P3).
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이 특허에 인용된 특허 (18)
Rikuta Sotokazu (24-7 ; 2-chome ; Koun-cho Maebashi-shi ; Gunma-ken JPX 371), Automatic controlling valve for maintaining the rate of fluid flow at a constant value.
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