WO2004094880A1 - Anti-scaling control element for a rotary control valve - Google Patents
Anti-scaling control element for a rotary control valve Download PDFInfo
- Publication number
- WO2004094880A1 WO2004094880A1 PCT/US2004/002047 US2004002047W WO2004094880A1 WO 2004094880 A1 WO2004094880 A1 WO 2004094880A1 US 2004002047 W US2004002047 W US 2004002047W WO 2004094880 A1 WO2004094880 A1 WO 2004094880A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- control element
- generally
- valve
- diameter
- recessed
- Prior art date
Links
- 239000012530 fluid Substances 0.000 claims abstract description 51
- 210000005069 ears Anatomy 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 7
- 238000000034 method Methods 0.000 description 10
- 230000015572 biosynthetic process Effects 0.000 description 6
- 230000003628 erosive effect Effects 0.000 description 5
- 238000007789 sealing Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
- F16K5/0605—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor with particular plug arrangements, e.g. particular shape or built-in means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K25/00—Details relating to contact between valve members and seats
- F16K25/005—Particular materials for seats or closure elements
Definitions
- the present anti-scaling control element relates generally to rotary control valves,, and more particularly to a ball valve that inhibits scale formation.
- Ball valves are commonly used to control the flow of a fluid in a pipe. These valves are particularly advantageous for controlling the flow of erosive slurries, such as those found in the mining industry. Unlike butterfly valves and eccentric plug valves, ball valves allow a fluid flow path that is substantially parallel to the flow in the pipe. Parallel flow reduces impingement erosion of valve components and downstream pipe.
- Typical ball valves include a generally hemispherical or ball-shaped control element that is movable between open and closed positions. In the closed position, a curved surface of the control element engages a sealing surface to prevent or regulate fluid flow through the valve body. In the open position, fluid may primarily flow past an inner sealing surface of the control element and through the flow ring. Internal features of the valve or control element, however, may reduce flow velocity through some regions of the valve. For example, one region of low velocity flow in many ball valves is located between the outside surface of the ball arid the flow ring when the valve is in an open position.
- erosive slurries may form scale on the valve components in regions of reduced velocity flow or stagnation. Scale can eventually inhibit operation of the valve, which may cause expensive and time-consuming maintenance or even dangerous working conditions for personnel. In some cases, slurries may form an extremely hard scale that may cause unusually extensive downtime or even require valve replacement. Many thousands of dollars may be lost if a process is halted to maintain or replace a non- operational valve.
- a rotary control valve is attached to a rotating shaft by at least one ear.
- the control element includes first and second surfaces, the first surface being generally sealable with a flow ring.
- the second surface is generally recessed from the first surface to facilitate fluid flowing through the valve across the first surface to prevent scaling or buildup of foreign material onthe second surface.
- a rotary control valve has a valve body and a control element that rotates within the valve body to control fluid flow through the valve body.
- the control element has a surface area that seats with a flow ring of the valve body to prevent fluid from flowing through the valve body.
- the control element also has a second surface that is generally recessed in relation to the first surface to create a secondary flow path through the valve body and across the first surface when the valve is in an open position to prevent scale or material build up along the first surface.
- FIGURE 1 is a cross-sectional view of a fluid control valve according to the prior art.
- FIGURE 2 is a cross-sectional view of a fluid control valve according to one embodiment of the present control element.
- FIGURE 3 is a plan, partial sectional view of a control element of a fluid control valve according to one embodiment of the present control element.
- FIGURE 4 is an elevation sectional view of a control element of a fluid control valve according to one embodiment of the present control element.
- FIGURE 5 is an elevation sectional view of a control element of a fluid control valve according to one embodiment of the present invention.
- FIGURE 6 is a plan, partial sectional view of a control element of a fluid control valve according to another embodiment of the present control element.
- control element provides many applicable inventive concepts that may be embodied in a wide variety of specific contexts.
- the specific embodiments discussed herein are merely illustrative of specific ways to make and use the control element and do not delimit the scope of the control element.
- a valve body 12 houses a control element 14, which may be rotated about the axis of a control shaft 16.
- a front surface 18 of the control element 14 is in frictional or close engagement with an annular seating surface 20, which may be formed, using a flow ring 22.
- fluid may flow in the direction indicated by arrow 24 from an upstream orifice 26 through the flow ring 22 and into a downstream orifice 28.
- Low velocity flow or stagnation may occur in a region 30. Consequently, scale 32 is likely to form on the front surface 18 of the control element 14 that is located in region 30 when the control element 14 is in an open position.
- Scale 32 may interfere with movement of the front surface 18 of the control element 14 across the annular seating surface 20 of the flow ring 22 and render the fluid control valve 10 inoperable.
- An inoperable fluid control valve 10 may require a process to be stopped while the fluid control valve 10 is serviced or replaced. Stopping a process for unscheduled maintenance could cause great economic loss. In some cases, an inoperable fluid control valve 10 may cause a dangerous or even life-threatening process condition.
- a fluid control valve 50 has a valve body 52 that houses a control element 54.
- the control element 54 may be rotated about the axis of a control shaft 56.
- a - face 58 A of the control element 54 has a control element seating surface 60 and a recessed surface 62.
- the control element seating surface 60 is in frictional or close engagement with an annular seating surface 64 of a flow ring 66, which may substantially reduce or stop fluid flow through the fluid control valve 50.
- fluid may flow along the primary flow path 68, which generally flows from an upstream orifice 70 though the flow ring 66 and into a downstream orifice 72. Additionally, when the fluid control valve 50 is in an open position, fluid may also flow across the face 58A of the control element 54 through a secondary flow path 74.
- Fluid flow across the face 58 A of the control element 54 may reduce or eliminate regions of low velocity flow or stagnation, which promote scale formation. Fluid flow through the secondary flow path 74 effectively prevents or reduces scale formation on the control element seating surface 60 and recessed surface 62.
- the fluid control valve 50 therefore, has an increased time between service as compared to prior valves. Reducing scheduled or necessary service times increases process efficiency and ultimately conserves operating costs.
- the fluid control valve 50 is also less likely to bind or seize because of scale formation on the face 58 A. Fluid control valve 50 is consequently safer and more reliable than prior valves.
- control element 54 may be made from heat-treated steel, ceramic, polymer, and the like.
- the control element 54 may also be made from other materials that will be apparent to those having ordinary skill in the art.
- the control element 54 may be cast, machined from a single piece of material or fabricated from multiple materials.
- the face 58A may be fabricated separately and attached to the control element 54 by welds, screws, press-fitting, adhesives and the like.
- the face 58 A may be removable from the control element 54 to facilitate maintenance or replacement of a worn or damaged fluid control valve 50.
- One or more screws (not shown) through the control element 54 may attach the face 58A to the control element 54.
- Ears 76 interface with the control shaft 56 through aperture 78 to move the control element 54 between open and closed positions when the control shaft 56 (depicted in figure 2) is rotated about its axis.
- the face 58 A may be made from different materials than the control element 54 or the flow ring 66 according to a particular process or application.
- the . control element 54 may be heat-treated steel and the face 58A may be a polymer to better withstand a corrosive environment, ease operation of the fluid control valve 50, or provide a particular sealing interface with the annular seating surface 64 of the flow ring 66.
- the interface between the control element seating surface 60 and the annular seating surface 64 of the flow ring 66 may vary depending on the requirements of a particular process application. If the fluid flowing through the fluid control valve 50 contains extremely corrosive or erosive fluids including strongly adhering scale, a loose tolerance between the control element seating surface 60 and the annular seating surface 64 may be desired. If a particular application requires that fluid flow be completely stopped tighter tolerances between the control element seating surface 60 and the annular seating surface 64 may be specified.
- Recessed surface 62 allows fluid to flow over the face 58 A of the control element 54 when the control element 54 is rotated into an open position.
- the shape of the recessed surface 62 may be varied according to a particular process or application. Although depicted as circular, the recessed surface 62 may be oval-shaped or even a channel cut through the face 58A of the control element 54.
- the recessed surface 62 may be tangential to the control element seating surface 60 or generally within a single plane. Additionally, the recessed surface 62 may be concentric to or offset from the centerline of the valve body 52. Other shapes for the recessed surface 62 will be apparent to those having ordinary skill in the art of fluid dynamics.
- the recessed surface 62 allows adequate flow velocity to prevent or reduce scaling between a control range of about 5 degrees to about 85 degrees of rotation of the control element 54. If the recessed surface 62 is too deep, adverse flow conditions may result in the primary flow path 68. If the recessed surface 62 is too shallow, inadequate flow velocity along the secondary flow path 74 may be conducive to scale formation. Ideal dimensions of the recessed surface 62 may be determined according to desired operating characteristics for a particular process or application. [0019] For example, the seating surface 60 of the control element 54 may have a spherical radius of generally 3.000 - (0.001 to 0.003) inches from a point on the axis of the control shaft 56 that intersects the centerline of the face 58.
- the dimensional tolerance is biased towards the minimum diameter.
- the recessed surface 62 may have a spherical radius of 2.81 inches from the point on the axis of the control shaft 56 that intersects the centerline of the face
- the seating surface 60 begins 1.75 inches from a plane through the axis of the control shaft 56 and perpendicular to the centerline of the face 58A and ends 2.37 inches from the plane.
- the recessed surface 63 may also be generally flat and generally parallel to the plane defined by the axis of the control shaft 56 and perpendicular to the centerline of the face 58B.
- the generally planar recessed surface 63 allows fluid to flow along a path that is substantially parallel to the flow in the pipe, thereby reducing impingement erosion of the valve components and the downstream pipe (not shown).
- the recessed surface 63 preferably allows fluid flow along the secondary flow path 74 with as little as about 5 degrees of rotation of the control element 54. The amount of rotation that will open the secondary flow path 74 is a function of the diameter or width of the recessed surface 63.
- the diameter or width of the recessed surface 63 also determines the area of the control element seating surface 60 that will interface the annular seating surface 64 of the flow ring 66. Consequently, the diameter or width of the recessed surface 63 may be varied, according to the desired sealing and operating characteristics of the fluid control valve 50.
- FIG. 2 Another embodiment of the present control element 54 provides advantages when exposed to strongly adhering scale.
- the interface between the control element seating surface 80 and the annular seating surface 64 of the flow ring 66 may vary depending on the requirements of a particular process application. If the fluid flowing through the fluid control valve 50 contains strongly adhering scale, a loose tolerance between the control element seating surface 80 and the annular seating surface 64 may be desired.
- the embodiment depicted in Figure 2 the embodiment depicted in Figure
- the seating surface 80 of the control element 54 may have a spherical radius of approximately 3.000 - (0.001 to 0.003) inches from a point on the axis of the control shaft 56 that intersects the centerline of the face 58C (as defined in Figure 2). Additionally, the recessed surfaces 82 and 84 may have a spherical radius of 2.81 inches from the point on the axis of the control shaft 56 that intersects the centerline of the face 58C (as defined in Figure 2).
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Taps Or Cocks (AREA)
- Sliding Valves (AREA)
- Multiple-Way Valves (AREA)
- Lift Valve (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
MXPA05009941A MXPA05009941A (en) | 2003-03-19 | 2004-01-26 | Anti-scaling control element for a rotary control valve. |
BRPI0407825-0A BRPI0407825A (en) | 2003-03-19 | 2004-01-26 | control element for a rotary control valve, and, rotary control valve |
CA002515460A CA2515460A1 (en) | 2003-03-19 | 2004-01-26 | Anti-scaling control element for a rotary control valve |
JP2006508625A JP2006521524A (en) | 2003-03-19 | 2004-01-26 | Anti-scaling control element for rotary control valve |
EP04705272A EP1604134A1 (en) | 2003-03-19 | 2004-01-26 | Anti-scaling control element for a rotary control valve |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/391,692 US20040183046A1 (en) | 2003-03-19 | 2003-03-19 | Anti-scaling control element for a rotary control valve |
US10/391,692 | 2003-03-19 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/328,378 Continuation US7762088B2 (en) | 2003-07-14 | 2006-01-09 | Apparatus and method for dispensing discrete amounts of viscous material |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004094880A1 true WO2004094880A1 (en) | 2004-11-04 |
Family
ID=32987735
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2004/002047 WO2004094880A1 (en) | 2003-03-19 | 2004-01-26 | Anti-scaling control element for a rotary control valve |
Country Status (8)
Country | Link |
---|---|
US (1) | US20040183046A1 (en) |
EP (1) | EP1604134A1 (en) |
JP (1) | JP2006521524A (en) |
CN (1) | CN1754055A (en) |
BR (1) | BRPI0407825A (en) |
CA (1) | CA2515460A1 (en) |
MX (1) | MXPA05009941A (en) |
WO (1) | WO2004094880A1 (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4233110B1 (en) * | 2007-08-01 | 2009-03-04 | 株式会社巴技術研究所 | Control valve |
US9200532B2 (en) | 2012-09-13 | 2015-12-01 | Honeywell International Inc. | Turbine wastegate |
US9010109B2 (en) | 2012-09-13 | 2015-04-21 | Honeywell International Inc. | Turbine wastegate |
EP2915977B1 (en) * | 2014-03-06 | 2018-10-10 | Honeywell International Inc. | Turbine wastegate |
JP6516785B2 (en) * | 2017-03-31 | 2019-05-22 | 株式会社栗本鐵工所 | Eccentric rotary valve |
JP7132791B2 (en) * | 2018-08-17 | 2022-09-07 | 株式会社栗本鐵工所 | Eccentric rotary valve |
US11946557B2 (en) | 2020-02-14 | 2024-04-02 | Crane Chempharma & Energy Corp. | Valve with unobstructed flow path having increased flow coefficient |
US11953113B2 (en) | 2020-02-14 | 2024-04-09 | Crane Chempharma & Energy Corp. | Valve with unobstructed flow path having increased flow coefficient |
US11519509B2 (en) * | 2020-02-14 | 2022-12-06 | Crane Chempharma & Energy Corp. | Valve with unobstructed flow path having increased flow coefficient |
US11841089B2 (en) | 2020-02-14 | 2023-12-12 | Crane Chempharma & Energy Corp. | Valve with unobstructed flow path having increased flow coefficient |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB917677A (en) * | 1959-01-16 | 1963-02-06 | Vulliez Paul | Improvements in and relating to fluid control valves |
US3494589A (en) * | 1968-07-31 | 1970-02-10 | Worthington Corp | Rotary valve with increased flow area |
US4036470A (en) * | 1973-05-09 | 1977-07-19 | Kieley & Mueller, Inc. | Cantilevered ball valve |
US4118008A (en) * | 1975-02-11 | 1978-10-03 | Honeywell Inc. | Rotary valve |
EP0304389A2 (en) * | 1987-08-21 | 1989-02-22 | Xomox Corporation | Rotary outlet valve |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2998957A (en) * | 1959-01-26 | 1961-09-05 | Vulliez Paul | Arrangement for fitting a self-centering cover without any clearance on valves and the like parts |
US3379408A (en) * | 1965-02-08 | 1968-04-23 | Acf Ind Inc | Eccentric plug valve |
US3623696A (en) * | 1969-12-30 | 1971-11-30 | Masoneilan Int Inc | Eccentric, sealless, rotary valve for flow control |
US4519579A (en) * | 1983-02-14 | 1985-05-28 | Fisher Controls, International, Inc. | Cam valve self-centering seat |
US4822000A (en) * | 1987-08-24 | 1989-04-18 | Rockford Controls Corporation | Eccentric segmented ball valves |
FI88641C (en) * | 1990-07-16 | 1993-06-10 | Neles Jamesbury Oy | control valve |
US5618026A (en) * | 1995-02-13 | 1997-04-08 | General Signal Corporation | Hybrid rotary control valve assembly |
AU6266996A (en) * | 1995-06-12 | 1997-06-27 | Keystone International Holdings Corporation | Rotary valve with pressure energized seal |
-
2003
- 2003-03-19 US US10/391,692 patent/US20040183046A1/en not_active Abandoned
-
2004
- 2004-01-26 CN CN200480005255.1A patent/CN1754055A/en active Pending
- 2004-01-26 WO PCT/US2004/002047 patent/WO2004094880A1/en not_active Application Discontinuation
- 2004-01-26 CA CA002515460A patent/CA2515460A1/en not_active Abandoned
- 2004-01-26 MX MXPA05009941A patent/MXPA05009941A/en not_active Application Discontinuation
- 2004-01-26 EP EP04705272A patent/EP1604134A1/en not_active Withdrawn
- 2004-01-26 JP JP2006508625A patent/JP2006521524A/en active Pending
- 2004-01-26 BR BRPI0407825-0A patent/BRPI0407825A/en not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB917677A (en) * | 1959-01-16 | 1963-02-06 | Vulliez Paul | Improvements in and relating to fluid control valves |
US3494589A (en) * | 1968-07-31 | 1970-02-10 | Worthington Corp | Rotary valve with increased flow area |
US4036470A (en) * | 1973-05-09 | 1977-07-19 | Kieley & Mueller, Inc. | Cantilevered ball valve |
US4118008A (en) * | 1975-02-11 | 1978-10-03 | Honeywell Inc. | Rotary valve |
EP0304389A2 (en) * | 1987-08-21 | 1989-02-22 | Xomox Corporation | Rotary outlet valve |
Also Published As
Publication number | Publication date |
---|---|
CA2515460A1 (en) | 2004-11-04 |
US20040183046A1 (en) | 2004-09-23 |
EP1604134A1 (en) | 2005-12-14 |
JP2006521524A (en) | 2006-09-21 |
BRPI0407825A (en) | 2006-02-14 |
MXPA05009941A (en) | 2005-11-04 |
CN1754055A (en) | 2006-03-29 |
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