• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    DRAWER VALVE SEAT, DRAWER VALVE AND METHOD FOR SEALING IN A DRAWER VALVE The present invention relates generally to plate style gate valves and, in particular, to a replaceable seal to seal between a floating gate valve seat. and a gate valve body. The gate valve seat comprises a tubular body (27) that has a face for contact with a drawer (17), and an outer end (38) that extends to a recess formed in the gate valve body; an annular cylindrical surface that defines a recess (37) extending into the outer end (38) of the tubular body (27); a spring member (43) which has a cylindrical part (44) that fits on the cylindrical surface of the recess (37) and a leg (45) which has a free end to confine a shoulder (25) of the recess; a metal-to-metal seal (41) between the cylindrical part (44) of the spring member (43) and the cylindrical surface of the recess (37); and the seal (41) is located in a recess (47) in the spring member (43).
    公开号:BR102012007777B1
    申请号:R102012007777-9
    申请日:2012-04-04
    公开日:2021-03-16
    发明作者:David Daniel Comeaux
    申请人:Vetco Gray, LLC；
    IPC主号:
    专利说明:

    FIELD OF THE INVENTION
    [001] The present invention relates in general to plate style gate valves and, in particular, to a replaceable seal to seal between a floating gate valve seat and a gate valve body. BACKGROUND OF THE INVENTION
    [002] A typical gate valve used in connection with oil and gas production has a body with a flow passage that extends through it. The flow passage crosses a central cavity. Seat rings are placed in recesses formed in the flow passage at the intersection of the flow passage and the cavity. A drawer will move variably through the central cavity to block the flow passage. The sealing rings fill a gap between the valve body and the drawer to prevent fluid from flowing around the drawer when the drawer blocks the flow passage.
    [003] The seats have seals that seal the seat to the recess of the flow passage. These seals prevent the entry of fluid from the flow passage or body chamber to the flow passage downstream. When the drawer is open, the seals do not perform any function. When the drawer is closed, seats can seal the chamber on the side or upstream or downstream to prevent fluid flow from passing through the drawer. Some seats float in the recess between the valve body and the drawer. These floating seats can provide improved sealing characteristics since the seat is able to better seal both the valve body and the drawer when the drawer moves through the cavity. This is due to the ability of the seat to adjust to the position of the drawer in response to the movement of the drawer through the cavity.
    [004] Typical seals are formed from a thermoplastic or elastomeric material and do not hold up well under environments of high pressure, extremely high temperature, and extremely low temperature. For example, in high pressure environments, thermoplastic materials do not reliably maintain a seal between the valve body and the seat ring. Similarly, in high-temperature or low-temperature environments, thermoplastic seals do not reliably maintain a seal and break at a faster rate. For example, at extremes of high pressure and high temperature, elastomer and thermoplastic seals will begin to peel off at points of contact with the valve seat and body. Peeling quickly breaks the seal causing the seals to wear out relatively quickly. The rapid failure rate means that the fluid will flow past the seals and prevent the seal and seat assembly from performing its function. Therefore, sealing replacement is a necessity during the life of the gate valve and gate valve seat. A typical seal is integrated with the seat. Therefore, when the seal is damaged or begins to wear past the point at which the seal is effective, the entire seat has to be replaced to replace the seal. Replacing the entire seat is expensive and time-consuming.
    [005] In order to overcome the problems with elastomeric seals, some gate valves employ metal seals between the gate valve body and the gate valve seats. Although metal seals overcome the problems of elastomeric seals, metal seals are unable to be used in a floating seat configuration. This is because the metal seals are pressed into the seal between the seat and the valve body in an interference fit. If the seat was to be moved to maintain contact with the gate valve, the metal seal between the seat and the body must be relieved of the pressure of the adjustment by interference and failure to maintain a seal. In addition, metal seals are again generally integrated into the seat body, so when the seal wears out, the entire seat and seal assembly has to be replaced with a great deal of time and cost.
    [006] The fluid transported through gate valves can often contain particles and debris, such as sand. Conventional seals are generally unable to efficiently handle these particles. If particles get caught between the seal and the seat, or the seal and the body, the particles can allow fluid to flow past the seal. In addition, these debris and particles can have a negative impact on the ability of the drawer and seal to operate as intended and to variably allow fluid to pass downstream.
    [007] Therefore, there is a need for a replaceable gate valve seat seal for high pressure environments that provides a secure seal at both high and low temperature extremes, while operating as a particle exclusion device. . DESCRIPTION OF THE INVENTION
    [008] These and other problems are generally solved or circumvented, and technical advantages are generally obtained, by the preferred embodiments of the present invention that provide a replaceable seal for a floating seat gate valve, and a method for using it.
    [009] According to an embodiment of the present invention, a gate valve seat is disclosed circumscribing a passage formed through the gate valve body. The gate valve seat includes a tubular body that has a face for contact with a drawer, and an outer end that extends to a recess formed in the gate valve body. An annular cylindrical surface of the tubular body defines a recess that extends into the outer end of the tubular body. The gate valve seat includes a spring member that has a cylindrical part that fits on the cylindrical surface of the recess and a leg that has a free end to confine a shoulder of the recess. The gate valve seat also includes a metal-to-metal seal between the cylindrical part of the spring member and the cylindrical surface of the recess.
    [010] In accordance with another embodiment of the present invention, a gate valve is disclosed which has a flow passage through a chamber containing a drawer and a recess formed in the flow passage. The gate valve seat includes a tubular body that has a face for contact with a drawer, and an outer end that extends to a recess formed in the gate valve body and an annular cylindrical surface that defines a recess that extends to inside the outer end of the tubular body. A spring member fits on the cylindrical surface of a recess in the tubular body. The recess extends into the outer end of the tubular body. The spring member also includes a tapered leg that has a free end to confine a shoulder in the recess. The gate valve seat also includes a metal-to-metal seal between the cylindrical part of the spring member and the cylindrical surface of the recess. The tubular body of the gate valve seat is adapted to fit loosely in the recess for axial movement relative to a geometric axis of the passage.
    [011] In accordance with yet another embodiment of the present invention, a method for sealing around a seat ring of a gate valve is disclosed. The method comprises providing a tubular body that has a face for contact with a drawer, an outer end that extends to a recess formed in the gate valve body, and an annular cylindrical surface that defines a recess that extends inwardly from from the outer edge. Next, the method adjusts a spring member that has a cylindrical part on the cylindrical surface of the recess and abuts a tapered leg that has a free end against a shoulder of the recess. The method creates a metal-to-metal seal between the cylindrical part of the spring member and the cylindrical surface of the recess, and then the method adapts the body to fit loosely in the recess for axial movement relative to a geometric axis of the passage.
    [012] An advantage of a preferred embodiment is that revealed embodiments provide a metal seal for use with a floating gate valve seat. In addition, the seal can be replaced without changing the seat geometry. The seal is also operable in high pressure, high and low temperature environments. In addition, the revealed achievements provide a particle exclusion function. BRIEF DESCRIPTION OF THE DRAWINGS
    [013] So that the way in which the characteristics, advantages and objectives of the invention, as well as others that will become evident, are achieved, and can be understood in more detail, the more particular description of the invention summarized briefly above can be taken as reference to the realizations of the same that are illustrated in the attached drawings that are part of this specification. It should be noted, however, that the drawings illustrate only one preferred embodiment of the invention and, therefore, should not be considered as limiting its scope since the invention can admit other equally effective realizations.
    [014] Figure 1 illustrates a sectional view of an exemplary gate valve according to an embodiment of the present invention.
    [015] Figure 2 illustrates a sectional view of an exemplary seat ring in use with the gate valve in Figure 1.
    [016] Figure 3 shows a sectional view of an alternative seat ring.
    [017] Figure 4 illustrates a sectional view of the gate valve in Figure 1 using the exemplary seats in Figure 3.
    [018] Figure 5 illustrates a sectional view of the gate valve in Figure 1 using the exemplary seats in Figure 2 and Figure 3. DESCRIPTION OF REALIZATIONS OF THE INVENTION
    [019] The present invention will be described more fully hereinafter with reference to the accompanying drawings, which illustrate embodiments of the invention. This invention can, however, be incorporated in many different ways and should not be construed as limited to the illustrated embodiments presented in this document. Instead, these achievements are provided so that this disclosure is detailed and complete, and takes the scope of the invention to a person skilled in the art. Similar numbers refer to similar elements throughout the document, and the main notation, if used, indicates similar elements in alternative embodiments.
    [020] In the following discussion, several specific details are presented to provide a complete understanding of the present invention. However, it will be obvious to one skilled in the art that the present invention can be practiced without these specific details. In addition, for the most part, details regarding construction, operation, use of the valve and so on have been omitted to the extent that these details are not considered necessary to obtain a complete understanding of the present invention, and are considered to be part of the knowledge of a technician on the subject.
    [021] Referring to Figure 1, valve 11 is a standard gate valve. The valve 11 has a body 13, and a flow passage 15 that extends transversely through the body 13. The valve 11 has a drawer 17, 17 'with an orifice 19 through it. Drawer 17 can be designed in one piece or two pieces. As illustrated, drawer 17 can be divided into two plates, 17 and 17 '. Each drawer plate 17 must either be open or closed at the same time. The drawer 17 is shown in the open position in Figure 1. The valve 11 shown in Figure 1 is a non-rising stem type valve, however, this invention can similarly be used in rising stem type valves. When drawer 17 is in the open position, orifice 19 of drawer 17 sits with flow passage 15 of valve 11 thereby allowing flow through valve 11. When drawer 17 is closed, orifice 19 no longer sits with flow passage 15 blocking the flow of fluid through the passage 15. A rod 29, when rotated, will cause the drawer 17 to move between the open and closed positions. A handle 31 is used to rotate stem 29. A conventional gasket set 33 provides a seal for stem 29.
    [022] Flow passage 15 crosses a central cavity or chamber 21 located in body 13. A recess is formed in flow passage 15 at each intersection with chamber 21. The recess has a cylindrical recess wall 23 that has an end outer end that ends in a shoulder of the recess 25. The shoulder of the recess 25 is perpendicular to the flow-through axis 15. A seat ring 27, described in more detail below with respect to Figure 2, is located on each recess.
    [023] With reference to Figure 2, each seat ring 27 is a tubular cylindrical member that has a seal passage 28 that extends through it. The seal passage 28 has a diameter approximately equal to the diameter for the flow passage 15 and the orifice 19. The seat ring 27 defines a conical surface 35 at one end close to the drawer 17. At an edge adjacent to the body 13 and close at shoulder 25, seat ring 27 further defines an annular seat body recess 37. seat body recess 37 extends from outer end 38 of seat ring 27 into shoulder 39. recess 37 has a diameter smaller than the outer diameter of the seat ring 27.
    [024] Each seat ring 27 may include an optional seal 41. An exemplary seal 41 is a hollow metal ring formed from any sealing material suitable for the particular application in which the seat ring 27 is placed. The seal 41 is located so that the seal 41 abuts the shoulder 39 and cylindrical recess 37, thereby effecting a seal between the contact surfaces. In this way, the seal 41 can provide a part of a metal-to-metal seal between the seat ring 27 and the body 13.
    [025] Each seat ring 27 includes a spring member 43. The spring member 43 is an annular member that has an approximately L-shaped profile that extends the length of the recess of the seat body 37 and has a portion of leg 45 interposed between outer end 38 of seat ring 27 and shoulder 25 of body 13. An exemplary spring member 43 is formed of a high performance nickel chromium alloy such as Inconel® 718 or 625+. The spring member 43 may have sufficient spring force to preload the seal between the outer end 38 of seat 27 and body 13 and maintain the seal in low pressure situations. For example, spring member 43 will have spring force equal to the force required to move seat ring 27 axially inward against drawer 17 plus an additional 68.95 kPa. The leg part 45 of the spring member 43 is at an inclination relative to a plane perpendicular to the geometric axis of the passage 15. The inclination allows a free end 46 of the leg part 45 to contact the shoulder 25. The leg 45 therefore comprises a tapered surface with the concave side of the tapered surface axially inward towards a drawer 17. The opening defined by the convex side of the leg 45 is smaller than the diameter of the cylindrical part 44 of the spring member 43 which fits in the recess 37. The spring member 43 defines an annular recess 47 at an inner end of the spring member 43 near the seal 41. The spring member 43 provides a spring force that pushes the seat ring 27 against the drawer 17 to maintain a energized seal with drawer member 17. Additionally, spring member 43 maintains pressure on seal 41 and forms a metal-to-metal seal at the point of contact between spring member leg part 45 and shoulder 25.
    [026] In operation, when the drawer 17 is in the open position, the fluid flows through the flow passage 15, and the seal 41 and spring member 43 do not perform any function. The fluid is able to communicate passing the seat ring face 27 and the drawer 17, thus resulting in no pressure differential across the seal and seat members. When the drawer 17 is moved to the closed position, the pressure of the fluid against the drawer 17 will push the drawer 17 away from the sealing interface between the upstream side of the drawer 17 and the seat ring 27. In response, the spring 43 will react against shoulder 25 to push seat ring 27 against drawer 17, maintaining the seal. In addition, the spring member 43 will exert a reactive force against the seal 41 so that the seal 41 maintains contact with the body of the seat 27 preventing fluid from passing through the seat ring 27 into the cavity 21 and around the drawer 17. When the fluid pressure increases on the upstream side of the drawer 17, fluid will attempt to push past the spring member 43, however, due to the angles of the spring member 43 away from the seat ring 27 towards passage 15 and stay in contact with the shoulder 25, the fluid will push against the part of the spring member 43 facing seat 27, thereby creating a sealing pressure on the spring member 43 which increases the pressure of the fluid.
    [027] In a similar way, the spring member 43 and seat 27 act as an exclusion. When the fluid tries to push past the spring member 43, the particles suspended in the fluid in passage 15 will be directed against the leg part 45 of the spring member 43 increasing the pressure of the fluid in front of drawer 17. The particles will become trapped inside the V-shaped annular space between the valve seat 27 and the leg part 45 of the spring member 43, thereby being trapped outside the flow of passage. This process will prevent the passage of these particles further downstream where they can prevent the formation of seals in other devices or piping objects that have low tolerances for particles suspended in the handled fluids.
    [028] In the exemplary embodiment, the seal 41 and spring member 43 can be replaced when damaged or worn. First, an operator can remove damaged or worn spring member 43 and seal 41. Then, the operator cools the seat ring 27 to a temperature that allows the geometry of the seat to be reduced. In the exemplary embodiment, the geometry of the reduced seat corresponds to the reduction from 0.000508 to 0.00127 centimeters on a radial basis. Simultaneously, the operator heats the seal 41, increasing the diameter of the seal 41. The operator then passes the seal 41 around the seat 27 so that the seal 41 will slide across the surface 38 and touch the shoulder 39, as shown in Figure 2. The operator then inserts the spring member 43 into the seat body recess 37 as shown in Figure 2. When each part returns to room temperature, a shrink fit between seal 41 and seat ring 27 is obtained Therefore, replacing the seal 41 and seat member 43 without changing the geometry of the seat ring 27 or requiring a replacement of the seat ring 27 itself.
    [029] In an alternative embodiment, illustrated in Figure 3, seat ring 27 can be modified as seat ring 27 '. Similar to seat ring 27 in Figure 1 and Figure 2, seat ring 27 'is located in each body recess 13 in chamber 21 and passage 15. Each seat ring 27' is a tubular cylindrical member that has a seal 28 'extending through it. The sealing passage 28 'has a diameter approximately equal to the diameter for flow passage 15 and orifice 19. The seat ring 27' defines a conical surface 35 'at an end close to drawer 17 and passage 15. At a close edge the passage 15 and close to the shoulder 25, the seat ring 27 'further defines a seat body recess 37'. The seat body recess 37 'extends from the inner diameter surface of the seat ring 27' adjacent to the passage 15 into the outer end 38 'to the shoulder 39'.
    [030] Each seat ring 27 'can include an optional seal 41'. An exemplary seal 41 'is a hollow metal “O” ring formed of any material suitable for sealing for the particular application in which the seat ring 27' is being placed. The seal 41 'is located so that the seal 41' contacts the shoulder 39 'at the intersection of the shoulder 39' with the surface 38 ', contacting both the shoulder 39' and the surface 38 ', thereby making a seal between the surfaces contact. In this way, the seal 41 'can provide a part of a metal-to-metal seal between seat ring 27' and body 13.
    [031] Each seat ring 27 'includes a spring member 43'. The spring member 43 'is an annular member that has an approximately L-shaped profile that extends the length of the seat body recess 37' and has a tapered leg portion 45 'interposed between the seat ring 27' and shoulder 25 of the body 13. The leg part 45 'extends away from the geometric axis of the passage 15. The concave part of the tapered surface leg 45' facing outward. An exemplary spring member 43 'is formed of a high performance nickel chromium alloy such as Inconel® 718 or 625+. The spring member 43 'can have sufficient spring force to preload the seal between seat 27' and body 13 and maintain the seal in low pressure situations. For example, the spring member 43 'will have a spring force equal to the force required to move the seat ring 27' against the drawer 17 plus an additional 68.95 kPa. The leg part 45 'of the spring member 43' forms an angle that is at an inclination with a plane perpendicular to the geometric axis of the passage 15, allowing a free end 46 'of the leg part 45' to contact the shoulder 25. The spring member 43 'defines an annular recess 47' at an inner end of spring member 43 'close to seal 41'. The spring member 43 'provides a spring force that pushes seat ring 27' against the drawer 17 to maintain an energized seal with the drawer member 17. Additionally, the spring member 43 'maintains pressure on the seal 41' and forms a metal-to-metal seal at the point of contact between the leg portion 45 'of spring member 43' and shoulder 25.
    [032] In operation, as shown in Figure 4, when the drawer 17 is in the open position, the fluid flows through the flow passage 15, and the seal 41 'and spring member 43' do not perform any function. The fluid is able to communicate passing the face of seat ring 27 'and drawer 17, therefore resulting in no pressure differential across the sealing and seat members. When the drawer 17 is moved to the closed position, the pressure of the fluid against the drawer 17 will push the drawer 17 away from the sealing interface between the upstream side of the drawer 17 and the seat ring 27 '. In response, the spring member 43 'will react against the upstream shoulder 25 to push the seat ring 27' against the drawer 17. However, due to the leg part 45 'of spring member 43' being angled away from the passage 15, the fluid can flow between the spring member 43 ', passing the contact surfaces of the seat ring 27' and body 13, and into the chamber 21. On the upstream side, the fluid will flow past the drawer 17 and against the seat ring 27 'downstream. The downstream seat ring 27 'will operate in a similar manner to the upstream seat ring 27 of Figure 1 and Figure 2.
    [033] The spring member 43 'will react against the downstream shoulder 25 to push the seat ring 27' downstream against the drawer 17. Additionally, the spring member 43 'will exert a force against the seal 41' so that the seal 41 'will maintain contact with the body of the seat 27' preventing the passage of fluid passing the seat ring 27 'into the downstream passage 15. When the fluid pressure increases inside the chamber 21, the fluid will try to push past the spring member 43 '; however, due to the spring member 43 'angled away from passage 15 and coming into contact with the boss 25 downstream, the fluid will push against the part of spring member 43' facing seat 27 ', thus creating a pressure of seal on spring member 43 'which increases with increased fluid pressure.
    [034] In a similar manner, the spring member 43 'and seat 27' downstream act as a particle exclusion. When the fluid tries to push past the spring member 43 ', the particles suspended in the fluid in chamber 21 will be directed against the leg part 45' of the spring member 43 'increasing the pressure of the fluid. The particles will be trapped within the V-shaped annular space between the valve seat 27 'and the leg part 45' of the spring member 43 ', thus being kept away from the flow of passage. This process prevents the passage of these particles further downstream where they can prevent the formation of seals in other devices or piping objects that have lower tolerances for particles suspended in the handled fluids.
    [035] Generally, the seat rings 27 and spring members 43 will be mounted inside the valve 11 so that both the upstream and downstream parts 45 of the spring members 43 will face passage 15 as in Figure 1 and Figure 2, or facing chamber 21 as in Figure 3 and Figure 4. This will allow for sealing in or upstream seat ring 27 (Figure 2), or downstream seat ring 27 '(Figure 3). In the event that the fluid flow is reversed through the embodiments of Figure 1 or Figure 4, the seat rings 27 of Figure 1 and seat rings 27 'of Figure 4 will maintain an effective seal. However, alternative embodiments may include a seat ring 27 on the upstream side of the drawer 17, and a seat ring 27 'as shown in Figure 5. Seat ring 27 includes the components of and operates like seat ring 27 of the Figure 1 and Figure 2. Similarly, the seat ring 27 'which includes the components of and operates like the seat ring 27' of Figure 3 and Figure 4. In this way, the chamber 21 can be sealed against the passage 15 on the upstream side of the drawer 17, and in case the fluid fills the chamber 21, the seat ring 27 'will seal the passage downstream 15 of the chamber 21. However, if the fluid flow is reversed in the realization of Figure 5, no seat will provide an effective seal.
    [036] Consequently, the disclosed achievements provide several advantages over previous devices for sealing a gate valve seat. For example, unlike conventional thermoplastic seals, the revealed achievements maintain sealing integrity in high pressure environments at both high and low temperature extremes. Additionally, the revealed achievements provide the sand exclusion function. In addition, the disclosed achievements provide significant cost savings over conventional seat ring seals that require replacement of the entire seat ring when damaged or significantly worn. Unlike prior art seals, the disclosed embodiment provides a metal seal for a floating seat in a gate valve. The metal seal is a stronger seal that often lasts longer than conventional sealing means.
    [037] It is understood that the present invention can take any forms and embodiments. Consequently, several variations can be made in the above disclosed without departing from the spirit or scope of the invention. Having therefore described the present invention by reference to some of its preferred embodiments, it is noted that the disclosed embodiments are illustrative rather than limiting in nature and that a wide range of variations, modifications, changes and substitutions are contemplated in the disclosure presented above, in some instances, some features of the present invention can be employed without a corresponding use of other features. Many of these variations and modifications can be considered obvious and desired by a person skilled in the art as a result of a review of the description presented above the preferred achievements. Consequently, it is appropriate for the appended claims to be widely interpreted in a manner consistent with the scope of the invention.
    权利要求:
    Claims (16)
    [0001]
    1. DRAWER VALVE SEAT (27), circumscribing a passage (15) formed through the gate valve body, and the gate valve seat is characterized by comprising: a tubular body (27) that has a face for contact with a drawer (17) and an external end (38) extending to a recess formed in the gate valve body; an annular cylindrical surface that defines a recess (37) extending into the outer end (38) of the tubular body (27); a spring member (43) which has a cylindrical part (44) that fits on the cylindrical surface of the recess (37) and a leg (45) which has a free end to confine a shoulder (25) of the recess; a metal-to-metal seal (41) between the cylindrical part (44) of the spring member (43) and the cylindrical surface of the recess (37); and wherein the seal (41) is located in a recess (47) in the spring member (43).
    [0002]
    2. DRAWER VALVE SEAT (27), according to claim 1, characterized by the leg (45) having a truncated configuration.
    [0003]
    3. DRAWER VALVE SEAT (27), according to claim 1, characterized in that the recess (37) of the tubular body (27) has a shoulder (39) facing outwards and the seal (41) is located on the shoulder ( 39).
    [0004]
    4. DRAWER VALVE SEAT (27) according to claim 1, characterized in that the seal (41) is located in a recess (47) of the spring member (43) at one end of the opposite spring member (43) to the leg (45).
    [0005]
    5. DRAWER VALVE SEAT (27), according to claim 1, characterized in that the tubular body (27) is adapted to fit loosely in the recess for axial movement relative to a geometric axis of the passage (15).
    [0006]
    6. DRAWER VALVE SEAT (27), according to claim 1, characterized in that the recess (37) in the tubular body (27) is located outside the tubular body (27).
    [0007]
    7. DRAWER VALVE SEAT (27), according to claim 6, characterized in that the leg (45) extends from the cylindrical part (44) towards a geometric axis of the tubular body (27).
    [0008]
    8. DRAWER VALVE SEAT (27), according to claim 1, characterized in that the recess (37) in the tubular body (27) is located inside the tubular body (27).
    [0009]
    DRAWER VALVE SEAT (27), according to claim 8, characterized in that the leg (45) extends from the cylindrical part (44) outside a geometric axis of the tubular body (27).
    [0010]
    10. DRAWER VALVE SEAT (27), according to claim 1, characterized in that the cylindrical part (44) of the spring member (43) has an inner diameter initially smaller than the outer diameter of the recess cylindrical annular surface ( 37) of the tubular body (27) so that the spring member (43) fits on the tubular body (27) by an interference fit to apply a radial preload force against the metal-to-metal seal (41).
    [0011]
    11. DRAWER VALVE (11), characterized by comprising: a tubular body (27) that has a chamber; a passage intersecting the body and the chamber; a movable drawer in the chamber and which has an orifice that is selectively registerable with the passage; annular recesses circumscribing the passage in a portion of the body adjacent to the chamber and each having a curved sidewall that depends axially on a flat face; annular seals of seat generally coaxial with the passage, each having an inner end in contact with the drawer and an outer end inserted with one of the recesses; annular recesses on the outer end of the seat seal; spring members (43) having an annular base portion defined in each of the recesses and generally coaxial with the passage, an annular leg with an outer diameter coupled to an axial end of the base portion and an inner diameter in sealing contact with one of the flat faces; and a metal-to-metal seal located in grooves found in each of the spring members.
    [0012]
    DRAWER VALVE (11), according to claim 11, characterized in that each of the grooves has a shoulder (39) facing outwards and the seal (41) is located in the shoulder (39).
    [0013]
    DRAWER VALVE (11) according to claim 11 characterized in that the grooves are located at the ends of the base portion opposite the leg (45).
    [0014]
    14. DRAWER VALVE (11) according to claim 11, characterized in that the recesses are located outside the seat seal and the legs extend towards an axis of the seat seal.
    [0015]
    15. DRAWER VALVE (11) according to claim 11, characterized in that the recesses are located inside the seat seal and the legs extend from the base portions to an axis of the seat seal.
    [0016]
    16. METHOD FOR SEALING IN A DRAWER VALVE (11), which has a body, a chamber in the body, a passage intersecting the body and the chamber and a movable drawer (17) inside the chamber that has a hole that selectively records with the passage, the method being characterized by: (a) providing an annular seat ring that has an inner end with a face for contact with the drawer (17), an outer end (38) for location in a recess in the body which circumscribes the passage and is adjacent to the chamber and an annular recess (37) formed on the surface of the seat ring which extends axially from the outer end (38); (b) providing a spring member (43) that has an annular base part (44) that is generally coaxial with the passage, an annular leg portion that has an outside diameter that depends on a lateral edge of the base portion, an inner diameter adjusted radially inward from a base portion and having a tapered cross section; (c) adjusting the spring member (43) on the seat ring so that the base portion is defined in the annular recess and the inner diameter of the leg portion is axially spaced from the outer end of the seat ring; (d) insert the seat ring into the chamber so that the outer end of the seat ring protrudes into the recess and so that the leg portion is in sealing contact with a planar surface in the recess; and (e) seal between the base portion and the seat ring with a hollow metal “O” ring.
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    SG185197A1|2012-11-29|
    NO343413B1|2019-02-25|
    AU2012202029A1|2012-10-25|
    US20120256113A1|2012-10-11|
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    法律状态:
    2017-05-02| B03A| Publication of an application: publication of a patent application or of a certificate of addition of invention|
    2018-12-18| B06F| Objections, documents and/or translations needed after an examination request according art. 34 industrial property law|
    2019-10-29| B06U| Preliminary requirement: requests with searches performed by other patent offices: suspension of the patent application procedure|
    2020-10-20| B25D| Requested change of name of applicant approved|Owner name: VETCO GRAY, LLC (US) |
    2021-01-05| B09A| Decision: intention to grant|
    2021-03-16| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 04/04/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US13/079,874|2011-04-05|
    US13/079,874|US8662473B2|2011-04-05|2011-04-05|Replaceable floating gate valve seat seal|
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