EP2184131A1 - Procédé de rodage, affilage, pierrage et polissage de surfaces d'étanchéisation sur un diamètre interne de cavité semi-aveugle dans le corps d' une vanne - Google Patents

Procédé de rodage, affilage, pierrage et polissage de surfaces d'étanchéisation sur un diamètre interne de cavité semi-aveugle dans le corps d' une vanne Download PDF

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Publication number
EP2184131A1
EP2184131A1 EP09175571A EP09175571A EP2184131A1 EP 2184131 A1 EP2184131 A1 EP 2184131A1 EP 09175571 A EP09175571 A EP 09175571A EP 09175571 A EP09175571 A EP 09175571A EP 2184131 A1 EP2184131 A1 EP 2184131A1
Authority
EP
European Patent Office
Prior art keywords
drive shaft
wheel
seat pocket
flow passages
seat
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP09175571A
Other languages
German (de)
English (en)
Inventor
Dwayne A. Salisbury
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vetco Gray LLC
Original Assignee
Vetco Gray LLC
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 Vetco Gray LLC filed Critical Vetco Gray LLC
Publication of EP2184131A1 publication Critical patent/EP2184131A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B37/00—Lapping machines or devices; Accessories
    • B24B37/04—Lapping machines or devices; Accessories designed for working plane surfaces
    • B24B37/042—Lapping machines or devices; Accessories designed for working plane surfaces operating processes therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B15/00—Machines or devices designed for grinding seat surfaces; Accessories therefor
    • B24B15/02—Machines or devices designed for grinding seat surfaces; Accessories therefor in valve housings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B33/00—Honing machines or devices; Accessories therefor
    • B24B33/02—Honing machines or devices; Accessories therefor designed for working internal surfaces of revolution, e.g. of cylindrical or conical shapes
    • B24B33/025—Internal surface of conical shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/02—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work
    • B24B5/06—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work for grinding cylindrical surfaces internally
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49405—Valve or choke making
    • Y10T29/49409—Valve seat forming

Definitions

  • the present invention relates in general to fabricating valve bodies and, in particular, to an improved system, method and apparatus for lapping, grinding, honing and polishing seal surfaces on inner diameters of semi-blind cavities in valves bodies.
  • a valve is a device that generally regulates the flow of a material by opening, closing, or partially obstructing a path through the valve.
  • the material may be a gas, a liquid, a fluidized solid, or slurry.
  • valves such as gate valves, and globe valves.
  • a gate valve typically consists of a valve body, a bonnet, a valve member, and a valve seat.
  • the valve body and the bonnet form the area in the valve that contains and directs material through the valve.
  • the valve body may have a bore that extends through the valve body.
  • the valve member interacts with the valve body to control the flow of material passing through the valve by being positioned to close or restrict flow.
  • a sliding gate with an opening can function as a valve member such that the opening aligns with the passage in the valve body to allow flow.
  • a solid portion of the sliding gate can be aligned partially or fully with the passage to restrict or block flow.
  • the bonnet is attached to the valve to hold other valve components, such as the valve member, in place and can be removed to provide access to the internal parts during maintenance.
  • valve seat is the interior surface in the valve body that contacts the gate to form a seal.
  • the gate comes into contact with the seat when the valve is closed.
  • the body and the seat could both come in a single piece of solid material or, alternatively, the seat could be a separate valve part that is attached or fixed to a seat pocket on the inside of the valve body.
  • the dimensions of the seat and seat pocket must correspond or the seat will not sit properly within the seat pocket of the valve body and leakage may occur.
  • the finishing tools used to correct or prevent such errors can thus be very expensive. Therefore, a more cost-effective technique for lapping, grinding, honing, and polishing seal surfaces on the seat pockets of a valve is desired.
  • a tool assembly comprising a cylindrical member, wheels of varying diameter and abrasive surface, and a rod for applying torque.
  • a tool assembly allows for lapping, grinding, honing and polishing seal surfaces on inner diameters of semi-blind cavities in valve bodies.
  • the tool can bring seat surfaces up to specification with the abrasive wheels having varying grit sizes.
  • the wheels are provided in an array of sizes to form a set of tools for a range of diameters, abrasion and surface finish capacity. This design allows the first (i.e., smallest) tool to enter a cavity in a valve body to begin cutting.
  • the wheel is attached to an end of the cylindrical member and rotated by applying torque through the rod that may traverse the opposite end of the cylindrical member.
  • the small diameter wheel Once the small diameter wheel has completed its cutting operation, it can be replaced with the larger size wheels to increase the diameter of the cavity, or valve seat, being machined until the desired size is achieved. Wheels with finer abrasive can then used to improve the surface finish of the cavity while minimizing the material removal.
  • a felt wheel may be used with a fine abrasive paste to provide the cavity with the final surface finish specification.
  • FIG. 1 is a sectional isometric view of one embodiment of a gate valve constructed in accordance with the invention
  • FIG. 2 is an enlarged sectional isometric view of one embodiment of a portion of a seat and seat pocket of the gate valve of FIG. 1 , and is constructed in accordance with the invention;
  • FIG. 3 is a schematic side view of one embodiment of a surface finishing tool for gate valves and is constructed in accordance with the invention
  • FIG. 4 is an isometric view of one embodiment of a set of tooling for the surface finishing tool of FIG. 3 ;
  • FIG. 5 is a schematic side view of another embodiment of a surface finishing tool for gate valves and is constructed in accordance with the invention.
  • FIGS. 1-5 depict embodiments of an improved system, method and apparatus for lapping, grinding, honing and polishing seal surfaces on inner diameters of semi-blind cavities in valves bodies.
  • the present invention is described as it may be applied in conjunction with an exemplary technique, in this case a technique for finishing a surface within the bore of a gate valve assembly for controlling the flow of a fluid, such as oil and/or gas, and is represented generally by reference numeral 20.
  • the illustrated embodiment of the gate valve 20 is a grease-less valve.
  • the present technique may be used in valves other than gate valves and other than grease-less valves.
  • the gate valve assembly 20 comprises a valve body 22 having a bore 24 extending though the valve body 22.
  • the bore 24 has a first opening 26 and a second opening 28.
  • the gate valve 20 is a bi-directional valve. Therefore, the first opening 26 may be used as an inlet to the bore 24 in one configuration and as an outlet in another configuration, as can the second opening 28.
  • this embodiment of the valve 20 has a valve cavity 30 that is covered by a bonnet 32.
  • a pair of seats 34 extends into the cavity 30 from seat pockets 36 formed on opposite sides of the cavity 30 in the bore 24 through the valve body 22.
  • a gate 38 is housed in the cavity 30 between the seats 34.
  • the gate 38 has an opening 40 and a solid portion 42 that are positioned to control flow through the gate valve 20.
  • the valve 20 is open and fluids are able to pass through the bore 24 via the opening 40 in the gate 38.
  • the valve 20 is closed and fluids are blocked from flowing through the bore 24 by the solid portion 42 of the gate 38.
  • the valve 20 also has a valve stem 44 that extends through the bonnet 32 to enable a user to position the gate 38 in either the open or closed configuration.
  • a hand wheel (not shown) or some other actuator may be used to position the valve stem 44.
  • a hydraulic actuator may be used to control the position of the gate 38.
  • An electrical or pneumatic actuator may be used, as well.
  • the seat 34 has a seat seal 46 that is used to form a seal between the seat 34 and the seat pocket 36.
  • the seat seal 46 prevents flow from leaking from the bore 24 via the seat 34.
  • the seat seal 46 has a U-shaped portion 48 with a pair of sealing surfaces 50 that contact the seat pocket 36 on one side and the seat 34 on the opposite side of the seat seal 46.
  • a standoff ring 52 is provided to extend between the back face 54 of the seat pocket 36 and the U-shaped sealing portion 48 of the seat seal 46.
  • the standoff ring 52 When installed in the seat pocket 36, the standoff ring 52 abuts the seat pocket back face 54 and urges the U-shaped sealing portion 48 of the seat seal 46 outward so that the sealing surfaces 50 of the seat seal 46 make contact with the seat pocket 36 and seat 34, respectively.
  • the seat 34 has a seat spring 56 that urges the seat 34 against the gate 38.
  • the correspondence between the seat seal 46 and the seat pocket 36 enables a seal to be maintained without the use of grease.
  • the sealing surfaces 50 of the seat seal 46 may not maintain a seal. Therefore, leakage from the bore 24 may occur.
  • the surface profile of the seat pocket 36 may be too rough for a proper seal due to chatter from the machining operations used to form the seat pocket 36, incidental damage to the surface finish, or some other cause.
  • the surface profile of the seat pocket 36 may have been machined somewhat oval rather than round.
  • the surface profile of the seat pocket 36 may be repaired if it is not sufficiently smooth and/or round. For example, the seat pocket 36 may be machined to re-bore the seat pocket 36.
  • a round, fixed abrasive tool 61 has an abrasive wheel 63 fixed to the distal end 64 of an outside diameter of a central cylindrical shaft 65.
  • the shaft 65 may be supported on or adjacent its ends 64, 66 by bushings 70.
  • the grit sizes of the abrasive on the wheels 63 may be provided in the range of 325 to 1200 mesh, for example.
  • the wheels 63 are provided in an array of sizes, as shown, to form a set of tools for a range of diameters, abrasion and surface finish capacity. This design allows the first (i.e., smallest) tool to enter the cavity defined within the cylindrical surface 36 and begin cutting. Additional larger sizes of the wheels 63 increase the diameter of the cavity being machined until the desired size is achieved.
  • the shaft 65 is inserted into the bore 24 ( FIG. 3 ) and the cylindrical tool shape may be used to radially constrain the device 61.
  • the bushings 70 ( FIG. 5 ) are located in the bore 24 for precise, additional support of the shaft 65. Both pockets 36 are machined with this process.
  • this tool 61 is not designed to machine axial surfaces 54, but only radial or cylindrical surfaces 36.
  • Axial surface 64 is normal to the axis of bore 24.
  • the abrasive tool 61 is pushed forward (i.e., to the left in FIG. 3 ) to machine the front radial pocket (i.e., left side 36 in FIG. 3 ), and the abrasive tool 61 is pulled rearward (i.e., to the right) to machine the rear radial pocket 36 (i.e., right side 36).
  • the assembled tooling 61 may be rotated by hand or machine-driven.
  • a handle 67 is mounted to the proximal end 66 of shaft 65.
  • the distal end 64 of the shaft 65 is axially positioned within valve cavity 30.
  • a selected one of the wheels 63 is then attached to distal end 64 and secured thereto while in cavity 30.
  • the wheel 63 While rotating the tool 61 by hand, the wheel 63 has sufficient taper to allow its leading edges to enter the cavities 36 and allow the abrasive to engage the inside diameter of the cavity wall 36.
  • the tool 61 is continually rotated and slowly fed into the cavity 36 until the wheel 63 is fully inserted into the cavity to treat the surfaces 36.
  • the smaller diameter wheel is replaced by a next larger diameter wheel, and the process is repeated as needed.
  • the wheels with finer abrasive are then used to improve the surface finish of the cavity while minimizing the material removal.
  • a felt wheel may be used with a fine abrasive paste to provide the cavity with the final surface finish specification.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP09175571A 2008-11-11 2009-11-10 Procédé de rodage, affilage, pierrage et polissage de surfaces d'étanchéisation sur un diamètre interne de cavité semi-aveugle dans le corps d' une vanne Withdrawn EP2184131A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11332608P 2008-11-11 2008-11-11
US12/578,398 US20100115772A1 (en) 2008-11-11 2009-10-13 Method for lapping, grinding, honing and polishing seal surfaces on inner diameter of semi-blind cavity in valve body

Publications (1)

Publication Number Publication Date
EP2184131A1 true EP2184131A1 (fr) 2010-05-12

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Family Applications (1)

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EP09175571A Withdrawn EP2184131A1 (fr) 2008-11-11 2009-11-10 Procédé de rodage, affilage, pierrage et polissage de surfaces d'étanchéisation sur un diamètre interne de cavité semi-aveugle dans le corps d' une vanne

Country Status (3)

Country Link
US (1) US20100115772A1 (fr)
EP (1) EP2184131A1 (fr)
BR (1) BRPI0904830A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8690124B2 (en) * 2009-12-11 2014-04-08 Ge Oil & Gas Pressure Control Lp Gate valve
US11828380B2 (en) * 2021-07-23 2023-11-28 Fisher Controls International Llc Valve bodies and methods of manufacturing the same

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB480553A (en) * 1937-03-19 1938-02-24 Babcock & Wilcox Ltd Improved tool for use in lapping the disc faces of valves on their seats
US2203143A (en) * 1939-06-09 1940-06-04 Samuel H Haas Valve seat grinding implement
US2351124A (en) * 1943-05-22 1944-06-13 John C Hendrick Grinding tool for reseating gate valves
US2360550A (en) * 1944-06-16 1944-10-17 Culp Lide Crocker Valve grinder
US2636325A (en) 1950-03-24 1953-04-28 Livingston Tool Co Valve seat reconditioning tool
US2908120A (en) * 1958-11-10 1959-10-13 Birger J Jensen Valve grinding apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB480553A (en) * 1937-03-19 1938-02-24 Babcock & Wilcox Ltd Improved tool for use in lapping the disc faces of valves on their seats
US2203143A (en) * 1939-06-09 1940-06-04 Samuel H Haas Valve seat grinding implement
US2351124A (en) * 1943-05-22 1944-06-13 John C Hendrick Grinding tool for reseating gate valves
US2360550A (en) * 1944-06-16 1944-10-17 Culp Lide Crocker Valve grinder
US2636325A (en) 1950-03-24 1953-04-28 Livingston Tool Co Valve seat reconditioning tool
US2908120A (en) * 1958-11-10 1959-10-13 Birger J Jensen Valve grinding apparatus

Also Published As

Publication number Publication date
BRPI0904830A2 (pt) 2013-07-02
US20100115772A1 (en) 2010-05-13

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