WO2018093384A1 - Soupape avec surfaces d'étanchéité alvéolées à réduction de frottement - Google Patents

Soupape avec surfaces d'étanchéité alvéolées à réduction de frottement Download PDF

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Publication number
WO2018093384A1
WO2018093384A1 PCT/US2016/062937 US2016062937W WO2018093384A1 WO 2018093384 A1 WO2018093384 A1 WO 2018093384A1 US 2016062937 W US2016062937 W US 2016062937W WO 2018093384 A1 WO2018093384 A1 WO 2018093384A1
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WO
WIPO (PCT)
Prior art keywords
dimples
valve
solid lubricant
lubricant layer
seat
Prior art date
Application number
PCT/US2016/062937
Other languages
English (en)
Inventor
Peter K. Cheung
Peter R. EHLERS
Original Assignee
Fmc Technologies, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fmc Technologies, Inc. filed Critical Fmc Technologies, Inc.
Priority to PCT/US2016/062937 priority Critical patent/WO2018093384A1/fr
Publication of WO2018093384A1 publication Critical patent/WO2018093384A1/fr

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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
    • F16K25/00—Details relating to contact between valve members and seats
    • 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
    • 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
    • F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
    • F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
    • F16K3/0227—Packings
    • F16K3/0236—Packings the packing being of a non-resilient material, e.g. ceramic, metal
    • 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
    • F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
    • F16K3/30—Details
    • F16K3/36—Features relating to lubrication
    • 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
    • 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
    • F16K5/0663—Packings
    • F16K5/0689—Packings between housing and plug
    • 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
    • F16K5/08—Details
    • F16K5/22—Features relating to lubrication
    • F16K5/227—Features relating to lubrication for plugs with spherical surfaces

Definitions

  • the present disclosure is directed to a valve, such as a gate valve or a ball valve, which includes a closure member that is slidably disposed between two seat members. More particularly, the disclosure is directed to a valve in which the closure member or seat member has at least one sealing surface on which a plurality of friction-reducing dimples are formed.
  • Gate valves and ball valves are used in a variety of industries to control fluid flow.
  • gate valves are used extensively in the oil and gas industry to control the flow of produced fluids at various stages of production.
  • Most gate valves used in this industry comprise a valve body having a
  • a transverse gate cavity which intersects the flow bore, a pair of spaced apart seats which are mounted in the flow bore, and a closure member in the form of a gate which is slidably positioned between the seats and which includes a gate opening that extends transversely through the gate.
  • the gate is movable by a variety of means between an open position in which the gate opening is aligned with the flow bore, and a closed position in which the gate opening is offset from the flow bore. In the closed position, the gate seals against the downstream seat to prevent fluid from flowing through the flow bore.
  • a diamond-like carbon coating may be applied to the seat and/or gate sealing surfaces.
  • this involves using a plasma vapor deposition process, which can be costly.
  • the coating can wear rapidly.
  • the coating thickness is typically minimal, which may not be ideal for abrasive wear resistance, (e.g., resistance to sand slurry).
  • a low friction coating made, e.g., from a solid lubricant such as molybdenum disulfide
  • solid lubricants have limited service life due to high wear rates, and they lack the ability to flow and replenish the contact area between the seat and gate sealing surfaces.
  • Another option for controlling friction between the gate and the seat sealing surfaces is to roughen the surfaces to promote lubricant retention.
  • the most common methods of surface roughening e.g., grinding or lapping
  • the surfaces polish themselves during running-in, which eventually reduces their ability to retain lubricant.
  • valve which comprises a valve body; a flow bore which extends through the valve body; first and second spaced apart seat members which are positioned in the valve body across the flow bore, each seat member comprising a
  • closure member which is movably positioned between the seat members, the closure member being movable between an open position in which a through bore in the closure member is aligned with the seat bores and a closed position in which the through bore is offset from the seat bores, the closure member comprising opposite first and second sides which are each positioned opposite a
  • the first and second seat members comprises a first sealing surface and at least one of the first and second sides comprises a second sealing surface which, when the closure member is in the closed position, sealingly engages the first sealing surface to thereby prevent fluid from flowing through the flow bore; and wherein at least one of the first and second sealing surfaces comprises a plurality of dimples.
  • the dimples may comprise a semicircular cross section. Also, the dimples may be arranged in a generally circular pattern on said at least one of the first and second sealing surfaces.
  • the dimples may be arranged such that the number of dimples is greater closer to the outer diameter than the inner diameter.
  • said at least one of the first and second sealing surfaces may be coated with a solid lubricant layer.
  • the solid lubricant layer may be configured to follow the contour of the dimples.
  • the solid lubricant layer may be configured to completely fill the dimples.
  • said at least one of the first and second sealing surfaces may comprise a wear-resistant coating which is disposed over a substrate from which the corresponding seat or gate is
  • the dimples may be formed in the wear-resistant coating.
  • the wear-resistant coating may be coated with a solid lubricant layer.
  • the solid lubricant layer may be configured to follow the contour of the dimples.
  • the solid lubricant layer may be configured to completely fill the dimples.
  • the substrate may comprise a plurality of initial dimples, and the wear-resistant coating may be configured to follow the contour of the initial dimples to thereby form the dimples.
  • the wear-resistant coating may be coated with a solid lubricant layer. Further, the solid lubricant layer may be configured to follow the contour of the dimples.
  • the solid lubricant layer may be configured to completely fill the dimples.
  • the present disclosure is also directed to a method for reducing friction between sealing surfaces in a valve, the valve comprising first and second spaced apart seat members and a closure member which is movably positioned between the seat members, the closure member comprising opposite first and second sides which are each positioned opposite a corresponding one of the first and second seat members when the closure member is in a closed position, at least one of the first and second seat members comprising a first sealing surface and at least one of the first and second sides comprising a second sealing surface which, when the closure member is in the closed position, sealingly engages the first sealing surface, the method comprising forming a plurality of dimples on at least one of the first and second sealing surfaces.
  • the method further comprises coating said at least one of the first and second sealing surfaces with a solid lubricant layer.
  • the solid lubricant layer may be configured to follow the contour of the dimples.
  • the solid lubricant layer may be configured to completely fill the dimples.
  • said at least one of the first and second sealing surfaces may comprise a wear-resistant coating which is disposed over a substrate from which the corresponding seat member or closure member is comprised, and the method may comprise forming the dimples in the wear-resistant coating.
  • the method may also comprise coating the wear- resistant coating with a solid lubricant layer.
  • the solid lubricant layer may be configured to follow the contour of the dimples. Alternatively, the solid lubricant layer may be configured to completely fill the dimples.
  • the step of forming a plurality of dimples on at least one of the first and second sealing surfaces may comprise forming a plurality of initial dimples on at least one of the first and second sealing surfaces, and configuring the wear-resistant coating to follow the contour of the initial dimples to thereby form the dimples.
  • the method may further comprise coating the wear-resistant coating with a solid lubricant layer.
  • the solid lubricant layer may be configured to follow the contour of the dimples.
  • the solid lubricant layer may be configured to completely fill the dimples.
  • the valve of the present disclosure includes a closure member and/or a seat member having a sealing surface which comprises a plurality of dimples for reducing friction between the sealing surfaces when the gate is stroked between the closed and open positions.
  • the dimples may comprise any practical configuration, such as hemispherical, and the dimple pattern may have a higher density of dimples towards the outer diameter of the sealing surface.
  • the dimples aid in reducing friction between the sealing surfaces by acting as lubricant reservoirs and debris traps.
  • the dimples may also promote micro- hydrodynamic lubrication between the sealing surfaces.
  • Figure 1 is a cross sectional view of an example of a gate valve in which the gate and/or seat members are provided with the dimpled sealing surfaces of the present disclosure
  • Figure 2 is a front perspective view of the seat member of the gate valve shown in Figure 1 ;
  • Figures 3-1 1 are cross sectional views of a portion of a gate member or seat member comprising dimpled sealing surfaces in accordance with additional embodiments of the present disclosure
  • Figure 12 is a front elevation view of the seat member shown in Figure 2;
  • Figure 13 is a front perspective view of the gate member of the gate valve shown in Figure 1 ;
  • Figure 14 is a front elevation view of the gate shown in Figure 13;
  • Figure 15 is a cross sectional view of an example of a ball valve in which the ball and/or seat members are provided with the dimpled sealing surfaces of the present disclosure
  • Figure 16 is a front perspective view of the seat member of the ball valve shown in Figure 15;
  • Figure 17 is a front perspective view of the ball member of the ball valve shown in Figure 15;
  • Figure 18 is a front elevation view of the seat member shown in Figure 16.
  • Figure 19 is a front elevation view of the ball member shown in Figure 17.
  • the present disclosure is directed to a valve of the type which includes a closure member slidably disposed between two seat members.
  • the valve includes a flow bore across which the seat members are positioned, and the closure member is movable between an open position and a closed position to thereby open and close the flow bore, respectively.
  • the closure member comprises at least one sealing surface
  • at least one seat member comprises a corresponding sealing surface, and when the valve is in the closed position, the closure member sealing surface engages the seat member sealing surface to thereby seal the flow bore.
  • At least one of the closure member sealing surface and the seat member sealing surface is provided with a plurality of dimples which, among other functions, serve to reduce the friction between the closure member and the seat member when the closure member is moved from the closed position to the open position.
  • the gate valve which is indicated generally by reference number 10 includes a valve body 12 having a flow bore 14 which extends longitudinally through the body and a gate cavity 16 which extends through the body generally transverse to the flow bore.
  • the gate valve 10 also includes a pair of seat members in the form of seats 18a, 18b which are each positioned at least partially in a corresponding seat pocket that is formed at the intersection of the flow bore 14 and the gate cavity 16, and a closure member in the form of a gate 20 which is slidably positioned between the seats.
  • Each seat 18a, 18b includes an axial seat bore 22a, 22b which is aligned with the flow bore 14 to thereby define a flow passage through the valve body 12.
  • the gate 20 comprises opposite first and second sides 20a, 20b which when the gate is in a closed position are each positioned opposite a corresponding one of the seats 18a, 18b, and a gate opening or through bore 24 which extends transversely through the gate between the first and second sides.
  • the gate 20 is connected to a stem 26 which in turn is connected to a lifting mechanism 28.
  • the lifting mechanism 28 forms no part of the present invention; accordingly, it may comprise any suitable manual or electrically or hydraulically operated device.
  • the lifting mechanism 28 functions to raise and lower the gate 20 between an open position in which the through bore 24 is aligned with the seat bores 22a, 22b and fluid is therefore allowed to flow through the flow bore 14, and a closed position in which the through bore is offset from the seat bores and fluid is therefore blocked from flowing through the flow bore.
  • the gate 20 comprises first and second closure member, or gate, sealing surfaces 30a, 30b which are formed on the opposite first and second sides 20a, 20b, respectively, and which, when the gate is in the closed position, as shown in Figure 1 , are positioned opposite corresponding first and second seat member, or seat, sealing surfaces 32a, 32b which are formed on the seats 18a, 18b, respectively.
  • first and second closure member or gate
  • sealing surfaces 30a, 30b which are formed on the opposite first and second sides 20a, 20b, respectively, and which, when the gate is in the closed position, as shown in Figure 1 , are positioned opposite corresponding first and second seat member, or seat, sealing surfaces 32a, 32b which are formed on the seats 18a, 18b, respectively.
  • the upstream side of the gate is exposed to the full working pressure of the fluid in the flow bore while the downstream side of the gate is often at ambient pressure.
  • This pressure differential results in a very high force which pushes the gate 20 against the downstream seat 18a, 18b.
  • the resulting friction at the gate-to-seat interface between the gate sealing surface 30a, 30b and the corresponding seat sealing surface 32a, 32b as the gate 20 is moved from the closed position to the open position can cause wear or galling of the sealing surfaces which in turn can reduce the sealing effectiveness of the gate valve 10.
  • At least one of the gate sealing surfaces 30a, 30b or at least one of the seat sealing surfaces 32a, 32b is provided with a plurality of dimples to reduce the friction at the gate-to-seat interface as the gate 20 is moved from the closed position to the open position.
  • a plurality of dimples 34 are formed in the seat sealing surface 32a, 32b of one of the seats 18a, 18b.
  • the dimples 34 may alternatively or in addition be formed on the gate sealing surface 30a, 30b of the gate 20, as will be described below.
  • the dimples 34 perform a number of functions.
  • the dimples 34 may serve as reservoirs for the lubricant which is applied between the sealing surfaces.
  • the dimples 34 can reduce adhesive friction between the sealing surfaces by providing additional lubricant through capillary action to any lubricant-depleted areas of the sealing surfaces.
  • the dimples 34 may serve as debris traps by providing spaces into which particles can fall during movement of the gate 20, which can reduce plowing friction caused by wear particle agglomeration or foreign particle (e.g., sand) ingestion. This can also improve sealing surface life by preventing the abrasive particles from scratching the sealing surfaces.
  • the dimples 34 may function as micro- hydrodynamic bearings between the sealing surfaces by promoting micro- hydrodynamic lubrication when relative motion between the sealing surfaces occurs.
  • a pressure rise in the converging section of the dimple, caused by the wedge effect may force the surfaces to separate at the microscopic level.
  • the dimples be kept shallow (e.g., no deeper than 0.005 inch) in order to take advantage of the rapid increase in lubricant viscosity when the lubricant is subjected to extreme pressure.
  • FIG. 3 A cross section through a single dimple 34 of a portion of a seat 18a, 18b or gate 20 is shown in Figure 3.
  • the seat or gate is made from a substrate 36 over which a relatively thick wear-resistant coating 38 is applied to form the sealing surface 30a, 30b, 32a, 32b.
  • the substrate 36 may comprise any suitable material, such as, e.g., Inconel, alloy steel, or any corrosion-resistant alloy.
  • the wear-resistant coating may comprise any appropriate material which is applied by any suitable method, such as, e.g., a thermal-sprayed or laser-cladded layer of tungsten carbide in a cobalt and chromium or nickel matrix.
  • an initial dimple 34' is formed in the substrate 36, and the wear- resistant coating 38 is then applied over the top of the substrate.
  • the wear- resistant coating 38 is configured to follow the contour of the initial dimple 34' to thereby form the final dimple 34.
  • the initial dimple 34' comprises a semicircular cross section, which tends to reduce any stress concentrations that the dimple may cause in the substrate 36.
  • the initial dimple 34' could comprise any practical cross section which achieves the benefits disclosed herein.
  • the initial dimple 34' may be created through any known process, such as ball nose cutting, ball end milling, electrical discharge machining, laser ablation, or indentation.
  • the wear-resistant coating 38 applied over the top of the substrate 36 will follow the contour of the initial dimple 34', resulting in a smaller-diameter final dimple 34 in the sealing surface 30a, 30b, 32a, 32b.
  • the larger size of the initial dimple 34' in the substrate 36 improves ease of manufacture, while the smaller size of the final dimple 34 in the sealing surface 30a, 30b, 32a, 32b is preferred for friction reduction.
  • the relatively even thickness of the wear-resistant coating 38 across the dimples 34', 34 may help avoid severe stress gradients within the coating, which can reduce the risk of coating spallation compared to a coating with uneven thickness.
  • the initial dimple 34' may also improve the bond strength between the wear- resistant coating 38 and the substrate 36 by providing a larger anchoring area for the wear-resistant coating.
  • a layer of liquid or semi-solid lubricant, such as oil, grease or paste, may be applied over the top of the wear-resistant coating 38 for friction reduction.
  • FIG. 4 Another embodiment is shown in Figure 4. This embodiment is similar to the embodiment shown in Figure 3. In the embodiment shown in Figure 4, however, a solid lubricant layer 40 is applied over the top of the wear-resistant coating 38.
  • the solid lubricant layer 40 follows the contour of the dimple 34 to further reduce friction.
  • the dimple 34 may also improve the adhesion of the solid lubricant layer 40 to the wear-resistant coating 38 by providing a larger anchoring area for the solid lubricant layer.
  • the solid lubricant layer 40 may be made of any suitable material, for instance diamond-like carbon or other chemicals such as graphite, molybdenum disulfide, hexagonal boron nitride, tungsten disulfide, or polytetrafluoroethylene.
  • a combination of solid lubricants may be preferred for effective friction reduction under various environmental conditions, such as graphite for high humidity conditions, molybdenum disulfide or tungsten disulfide for low humidity
  • the solid lubricant may be applied using any appropriate method, such as burnishing, bonding, or vapor deposition. If desired, a layer of liquid or semisolid lubricant, such as oil, grease or paste, may be applied over the top of the solid lubricant layer 40 for initial friction reduction during valve running-in.
  • FIG. 5 An alternative embodiment to that shown in Figure 4 is shown in Figure 5.
  • the solid lubricant layer 40 is applied so as to completely fill the dimple 34.
  • the dimple 34 initially acts as a solid lubricant reservoir rather than a debris trap.
  • the dimple 34 will still act as a debris trap once the solid lubricant is depleted from the dimple during valve operation.
  • a layer of liquid or semi-solid lubricant, such as oil, grease or paste, may be applied over top of the solid lubricant layer 40 for initial friction reduction during valve running-in.
  • the dimple 34 is formed directly in the wear-resistant coating 38.
  • the dimple 34 may be created in the wear-resistant coating 38 via, e.g., electrical discharge machining or laser ablation.
  • the dimple 34 is formed directly in the wear-resistant coating 38, such as in the embodiment of Figure 6, and a solid lubricant layer 40 is applied over the top of the wear-resistant coating 38 so as to follow the contour of the dimple, such as in the embodiment of Figure 4.
  • the dimple 34 is formed directly in the wear-resistant coating 38, such as in the embodiment of Figure 6, and a solid lubricant layer 40 is applied over the top of the wear-resistant coating 38 so as to completely fill the dimple, such as in the embodiment of Figure 5.
  • the substrate 36 of the seat or gate is not covered by a wear-resistant coating 38. Rather, the dimple 34 is formed directly in the substrate 36.
  • the substrate 36 may be made of a wear-resistant material such as a cobalt-chromium-carbide alloy.
  • the dimple 34 may be created through, e.g., ball nose cutting, ball end milling, electrical discharge machining, laser ablation or indentation.
  • FIG. 10 is similar to the embodiment shown in Figure 9. In the embodiment of Figure 10, however, a solid lubricant layer 40 is applied over the top of the substrate 36 so as to follow the contour of the dimple 34, such as in the embodiment of Figure 4.
  • FIG. 1 1 is likewise similar to the embodiment shown in Figure 9.
  • a solid lubricant layer 40 is applied over the top of the substrate 36 so as to completely fill the dimple 34, such as in the embodiment of Figure 5.
  • the dimples 34 may be arranged on the sealing surface 30a, 30b, 32a, 32b in any practical pattern.
  • One example of such a pattern is shown in Figure
  • the dimples 34 are arranged in a generally circular pattern which is coaxial with the inner and outer diameters.
  • This circular pattern can be beneficial for manufacturing simplicity and for instances where the sliding direction may change, such as if the seat rotates within the seat pocket during valve operation.
  • the dimples 34 may be arranged such that the pattern density is biased towards the outer diameter 44 of the sealing surface 32a, 32b (i.e., the number of dimples is greater closer to the outer diameter than the inner diameter of the sealing surface). This region experiences lower local bearing stresses and can better tolerate surface texture features than the region near the inner diameter 42.
  • the dimples 34 are shown in Figure 12 to be formed on a seat sealing surface 32a, 32b, they may alternatively or in addition be formed on a gate sealing surface 30a, 30b. Referring to Figures 13 and 14, for example, a plurality of dimples 34 may be formed on one or both sealing surfaces 30a, 30b of the gate 20. In this embodiment, the dimples 34 may be arranged in rows which are aligned longitudinally along the gate sealing surface 30a, 30b. Also, the dimples 34 may be arranged such that the pattern density is biased towards the regions where lubricant depletion is most likely to occur and where the local bearing stresses are low enough to tolerate surface texture features.
  • the dimpled sealing surfaces may be incorporated into a variety of valves.
  • the dimpled sealing surfaces are shown incorporated into an exemplary ball valve, generally 100.
  • the ball valve 100 includes a valve body 102 comprising a flow bore 104 which extends transversely therethrough and a valve cavity 106 which intersects flow bore.
  • the ball valve 100 also includes a pair of seat members in the form of seats 108a, 108b.
  • Each seat 108a, 108b is mounted in a corresponding seat retainer 1 10a, 1 10b which is positioned at the intersection of the flow bore 104 and the valve cavity 106, and each seat includes an axial seat bore 1 12a, 1 12b which is aligned with the flow bore 104.
  • a closure member in the form of a ball 1 14 is rotatably positioned between the seats 108a, 108b.
  • the ball 1 14 comprises generally diametrically opposite first and second sides 1 14a, 1 14b which when the ball is in a closed position are each positioned opposite a corresponding one of the seats 108a, 108b, and a through bore 1 16 which extends through the ball generally 90° offset from the first and second sides.
  • the ball 1 14 is connected to a stem 1 18 which in turn is connected to a turning mechanism 120.
  • the turning mechanism 120 forms no part of the present invention; accordingly, it may comprise any suitable manual or electrically or hydraulically operated device.
  • the turning mechanism 120 functions to turn the ball 1 14 between an open position in which the through bore 1 16 is aligned with the seat bores 1 12a, 1 12b and fluid is therefore allowed to flow through the flow bore 104, and a closed position (shown in Figure 15) in which the through bore is offset from the seat bores and fluid is therefore blocked from flowing through the flow bore.
  • the ball 1 14 comprises first and second closure member, or ball, sealing surfaces 122a, 122b which are formed on the first and second sides 1 14a, 1 14b, respectively, and which, when the ball is in the closed position, as shown in Figure 15, are positioned opposite corresponding first and second seat member, or seat, sealing surfaces 124a, 124b which are formed on the seats 108a, 108b, respectively.
  • At least one of the ball sealing surfaces 122a, 122b or at least one of the seat sealing surfaces 124a, 124b is provided with a plurality of dimples 34 to reduce the friction at the ball-to-seat interface as the ball 1 14 is rotated from the closed position to the open position.
  • the dimples 34 are arranged on the seat sealing surface 124a, 124b in a generally circular pattern which is generally concentric with the seat opening.
  • the pattern density of the dimples 34 may be biased toward the outer diameter of the seat sealing surfaces 124a, 124b and/or towards the regions where lubricant depletion is most likely to occur and where the local bearing stresses are low enough to tolerate surface texture features.
  • the dimples 34 may alternatively or in addition be formed on one or both of the ball sealing surfaces 122a, 122b. As shown in Figures 17 and 19, the dimples may be arranged on the ball sealing surfaces 122a, 122b in a generally circular pattern, and the pattern density of the dimples may be biased towards the regions where lubricant depletion is most likely to occur and where the local bearing stresses are low enough to tolerate surface texture features.
  • the dimples 34 may be formed using any of the techniques described above, and the sealing surfaces 122a, 122b, 124a, 124b may include any configuration of wear- resistant coating and/or solid lubricant layer depicted in Figures 3-1 1 .

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Sliding Valves (AREA)

Abstract

Soupape comprenant un corps de soupape, un trou d'écoulement s'étendant à travers le corps de soupape, des premier et second éléments de siège positionnés dans le corps de soupape à travers le trou d'écoulement, chacun de ceux-ci ayant un trou de siège correspondant aligné sur le trou d'écoulement, et un élément de fermeture positionné de façon mobile entre les éléments de siège. L'élément de fermeture comporte des premier et second côtés positionnés chacun à l'opposé d'un des premier et second éléments de siège correspondant lorsque l'élément de fermeture est dans une position fermée. Au moins l'un des premier et second éléments de siège comprend une première surface d'étanchéité et au moins l'un des premier et second côtés comprend une seconde surface d'étanchéité qui, lorsque l'élément de fermeture est dans la position fermée, vient en prise de manière étanche avec la première surface d'étanchéité empêchant l'écoulement de fluide dans le trou d'écoulement. Au moins l'une des première et seconde surfaces d'étanchéité comprend une pluralité d'alvéoles efficaces pour réduire le frottement entre les première et seconde surfaces d'étanchéité.
PCT/US2016/062937 2016-11-18 2016-11-18 Soupape avec surfaces d'étanchéité alvéolées à réduction de frottement WO2018093384A1 (fr)

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PCT/US2016/062937 WO2018093384A1 (fr) 2016-11-18 2016-11-18 Soupape avec surfaces d'étanchéité alvéolées à réduction de frottement

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PCT/US2016/062937 WO2018093384A1 (fr) 2016-11-18 2016-11-18 Soupape avec surfaces d'étanchéité alvéolées à réduction de frottement

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