Top-mounted high-temperature ball valve capable of being disassembled and assembled on line

Abstract

The utility model discloses a top-mounted high-temperature ball valve capable of being disassembled and assembled on line, belongs to the technical field of valves, and aims to solve the problem that an existing ball valve cannot meet the requirements of on-line disassembly and assembly and high-temperature reliable sealing at the same time. Comprising a valve body and valve seats, spring seats and valve seats are arranged in a medium inlet and a medium outlet in a sliding mode, the valve seats and the spring seats are matched in an inserted connection mode, the spring seats are sleeved with disc spring assemblies, the valve seats are sleeved with first graphite sealing rings, and one ends of the disc spring assemblies abut against the shaft shoulder end faces of the spring seats. The valve seats are in sliding seal with the medium inlet or the medium outlet through a first graphite sealing ring, a ball is arranged between the two valve seats, the lower end of the valve rod is matched with the ball in an inserted connection mode, and the upper end of the valve rod is in rotating seal with the valve deck through a second graphite sealing ring. The utility model can realize on-line disassembly and maintenance, and can be used under high-temperature working conditions at the same time.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, and in particular relates to a top-mounted high-temperature ball valve that can be disassembled and installed online. Background Technology

[0002] A ball valve is a device used to cut off, distribute, and change the direction of media flow. Due to its low flow resistance, rapid opening and closing, and good sealing performance, it is widely used in oil and gas pipelines, oil extraction, oil refining, petrochemical, chemical, chemical fiber, metallurgy, power, nuclear power, food, and papermaking plants.

[0003] Top-entry ball valves are a type of ball valve structure. Due to their robust one-piece valve body, fewer leakage points, reliable sealing, and online disassembly capabilities, they are widely used in applications requiring high sealing and quick disassembly. Currently, most top-entry ball valves on the market are designed for normal and low-temperature operation, and their sealing methods often use rubber and plastic seals, making them unsuitable for high-temperature applications. For example, patent number CN201310200328.3 discloses a top-entry ball valve structure where the valve seat seal uses a rubber O-ring seal. Based on the properties of rubber, its maximum operating temperature is around 300℃; exceeding this temperature will cause the seal to age prematurely. Another patent, CN201910044043.2, discloses a top-entry ultra-high temperature ball valve. Although this structure is top-entry, it lacks online disassembly functionality.

[0004] In some demanding applications, it is necessary to simultaneously meet the requirements of online disassembly and assembly, superstructure, and reliable high-temperature sealing. Therefore, a new structure is required to meet all these requirements. Utility Model Content

[0005] The purpose of this invention is to provide a top-mounted high-temperature ball valve that can be disassembled and reassembled online, thereby solving the problem that existing ball valves cannot simultaneously meet the requirements of online disassembly and reliable high-temperature sealing. The technical solution adopted by this invention is as follows:

[0006] A high-temperature ball valve with online disassembly and assembly includes a valve body, a disc spring assembly, a valve seat, a ball, a first graphite sealing ring, a spring seat, a valve cover, a valve stem, a bracket, and an actuator.

[0007] The valve body has a valve cavity, through which the medium inlet, medium outlet, and upper opening are connected. The end closer to the valve cavity is defined as the inner side, and the end farther from the valve cavity as the outer side. Both the medium inlet and outlet are stepped holes composed of a first, second, and third hole segment connected together, arranged sequentially from the inner to the outer side, with their diameters decreasing sequentially. The outer circumference of the valve seat is a stepped shaft composed of a first, second, and third shaft segment connected together, arranged sequentially from the inner to the outer side, with their diameters decreasing sequentially. The inner circumference of the spring seat is a stepped hole composed of a fourth and fifth hole segment connected together, arranged sequentially from the inner to the outer side, with their diameters decreasing sequentially. The fourth hole section is larger than the fifth hole section. The outer circumference of the spring seat is a stepped shaft composed of the fourth and fifth shaft sections connected together. The fourth and fifth shaft sections are arranged from the inside to the outside. The diameter of the fourth shaft section is larger than the diameter of the fifth shaft section. The fifth shaft section slides with the second hole section, the fourth shaft section slides with the first hole section, the third shaft section slides with the fourth hole section, and the second shaft section slides with the first hole section. A disc spring assembly is sleeved on the fifth shaft section. The two ends of the disc spring assembly abut against the end faces of the second hole section and the fourth shaft section, respectively. A first graphite sealing ring is sleeved on the third shaft section. The circumferential surface of the third shaft section and the circumferential surface of the first hole section are sealed by the first graphite sealing ring. The end faces of the second shaft section and the end faces of the fourth shaft section are sealed by the first graphite sealing ring.

[0008] The ball enters and exits the valve chamber through the upper opening of the valve body. The ball is engaged with two valve seats. The valve cover is detachable and seals the upper opening of the valve body. There are ball handles on both the upper and lower sides of the ball. The two ball handles are coaxial. The upper ball handle is rotatably engaged with the valve cover, and the lower ball handle is rotatably engaged with the valve body. The actuator is fixed on the valve cover by a bracket. The upper end of the valve stem is connected to the output end of the actuator. The lower end of the valve stem is provided with a square column head structure. The square column head passes through the valve cover and is inserted into the upper ball handle.

[0009] Furthermore, a stuffing box is machined on the upper surface of the valve cover, and the valve stem passes through the stuffing box through the valve cover. A second graphite sealing ring is provided inside the stuffing box, and the valve stem and valve cover are sealed by rotating the second graphite sealing ring.

[0010] Furthermore, both the packing gland and the packing sleeve are fitted onto the valve stem. The packing gland is connected to the valve cover via a pre-tightening screw. The packing gland presses the second graphite sealing ring onto the bottom surface of the stuffing box via the packing sleeve. The upper end face of the packing sleeve is a convex spherical surface, and the lower end face of the packing sleeve is provided with a concave spherical groove. The convex spherical surface and the concave spherical groove are universally fitted.

[0011] Furthermore, the pre-tightening screw passes through the packing gland and is threadedly connected to the valve cover. A set of disc-shaped gaskets is sleeved on the top of the pre-tightening screw. The nut is threadedly engaged with the pre-tightening screw, and the nut presses the set of disc-shaped gaskets onto the upper surface of the packing gland.

[0012] Furthermore, a groove is provided on the lower side wall of the valve cavity, and the outer periphery of the lower ball handle and the circumferential surface of the groove are rotatably engaged by a sliding bearing. A ball thrust pad is provided between the end face of the lower ball handle and the bottom surface of the groove.

[0013] Furthermore, a stepped groove is provided on the lower end face of the valve cover, and the outer periphery of the upper ball handle is rotatably engaged with the periphery of the stepped groove through a sliding bearing. A shoulder is provided at the bottom of the valve stem, and a valve stem thrust washer is provided between the upper end face of the shoulder and the bottom face of the stepped groove.

[0014] Furthermore, the outer periphery of the first shaft section is machined with process grooves.

[0015] Furthermore, the output end of the actuator is circumferentially fitted to the valve stem via a key.

[0016] Furthermore, the valve cover and valve body are sealed by a metal C-ring.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. The ball valve of this utility model has a simple structure and can be disassembled and installed online. The outer periphery of the valve seat is provided with a process groove. First, the valve cover is removed, and then a tool is inserted into the process groove. Force is applied to both sides of the two valve seats respectively, so that the ball can be installed and removed between the two valve seats. The ball can enter and exit the valve cavity through the upper opening of the valve body. The valve seat and spring seat can also enter and exit the valve cavity through the upper opening of the valve body for installation and removal, realizing online disassembly and maintenance when the valve is installed on the pipeline.

[0019] 2. The valve seat engages with the ball through the elastic force provided by the disc spring assembly. Simultaneously, the disc spring assembly retains some compression, providing sufficient space for the valve seat to retract, ensuring smooth installation and removal of the ball. When the valve seat retracts to its final position, the outer end face of the first shaft section engages with the inner end face of the first hole section, ensuring that the disc spring assembly is not over-compressed when the valve seat retracts outward, preventing the elastic force from weakening.

[0020] 3. This utility model uses a first graphite sealing ring and a second graphite sealing ring to seal the valve seat and valve stem, which can meet the requirements of use under high temperature conditions. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a sectional view of the valve body;

[0023] Figure 3 This is a cross-sectional view of the spring seat;

[0024] Figure 4 This is a cross-sectional view of the valve seat;

[0025] Figure 5 This is a schematic diagram showing the assembly and disassembly of the sphere using tooling.

[0026] Figure 6 yes Figure 1 Enlarged view of point A.

[0027] In the diagram, 1. Valve body, 2. Disc spring assembly, 3. Valve seat, 4. Ball thrust washer, 5. Ball, 6. Sliding bearing, 7. First graphite seal ring, 8. Spring seat, 9. Metal C-ring, 10. Valve stem thrust washer, 11. Valve cover, 12. Second graphite seal ring, 13. Packing sleeve, 14. Packing gland, 15. Disc gasket assembly, 16. Valve stem, 17. Bracket, 18. Key, 19. Actuator, 20. First bore section, 21. Second bore section, 22. Third bore section, 23. Slot, 24. Fourth shaft section, 25. Fifth shaft section, 26. Fourth bore section, 27. Fifth bore section, 28. First shaft section, 29. Second shaft section, 30. Third shaft section, 31. Process groove, 32. Ball handle, 33. Tooling. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the present utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the present utility model.

[0029] The connections mentioned in this utility model are divided into fixed connections and detachable connections. Fixed connections, also known as non-detachable connections, include but are not limited to conventional fixed connection methods such as folded connections, riveted connections, adhesive connections, and welded connections. Detachable connections include but are not limited to conventional disassembly methods such as bolt connections, snap-fit ​​connections, pin connections, and hinge connections. When a specific connection method is not explicitly defined, it is assumed that at least one existing connection method can be found to achieve this function, and those skilled in the art can choose according to their needs. For example, a welded connection can be chosen for a fixed connection, and a bolted connection can be chosen for a detachable connection.

[0030] The present invention will be further described in detail below with reference to the accompanying drawings. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0031] Example: Figures 1-6As shown, a top-mounted high-temperature ball valve that can be disassembled and installed online includes a valve body 1, a disc spring assembly 2, a valve seat 3, a ball 5, a first graphite sealing ring 7, a spring seat 8, a valve cover 11, a valve stem 16, a bracket 17, and an actuator 19.

[0032] The valve body 1 has a valve cavity, through which the medium inlet, medium outlet, and upper opening of the valve body 1 are connected. The end closer to the valve cavity is defined as the inner side, and the end farther from the valve cavity as the outer side. Both the medium inlet and outlet are stepped holes formed by connecting the first hole segment 20, the second hole segment 21, and the third hole segment 22. The first hole segment 20, the second hole segment 21, and the third hole segment 22 are arranged sequentially from the inner to the outer side, with their diameters decreasing sequentially. The outer periphery of the valve seat 3 is a stepped shaft formed by connecting the first shaft segment 28, the second shaft segment 29, and the third shaft segment 30. The first shaft segment 28, the second shaft segment 29, and the third shaft segment 30 are arranged sequentially from the inner to the outer side, with their diameters decreasing sequentially. The inner periphery of the spring seat 8 is a stepped hole formed by connecting the fourth hole segment 26 and the fifth hole segment 27. The fourth hole segment 26 and the fifth hole segment 27 are arranged sequentially from the inner to the outer side. The diameter of the fourth hole segment 26 is larger than that of the fifth hole segment 27. The outer periphery of the spring seat 8 is a stepped shaft composed of the fourth shaft segment 24 and the fifth shaft segment 25 connected together. The fourth shaft segment 24 and the fifth shaft segment 25 are arranged from the inside to the outside. The diameter of the fourth shaft segment 24 is larger than that of the fifth shaft segment 25. The fifth shaft segment 25 is slidably engaged with the second hole segment 21. The fourth shaft segment 24 is slidably engaged with the first hole segment 20. The third shaft segment 30 is slidably engaged with the fourth hole segment 26. The second shaft segment 29 is slidably engaged with the first hole segment 20. A disc spring assembly 2 is sleeved on the fifth shaft segment 25. The two ends of the disc spring assembly 2 abut against the end faces of the second hole segment 21 and the fourth shaft segment 24, respectively. A first graphite sealing ring 7 is sleeved on the third shaft segment 30. The circumferential surface of the third shaft segment 30 and the circumferential surface of the first hole segment 20 are sealed by the first graphite sealing ring 7. The end face of the second shaft segment 29 and the end face of the fourth shaft segment 24 are sealed by the first graphite sealing ring 7.

[0033] The ball 5 enters and exits the valve chamber through the upper opening of the valve body 1. The ball 5 is respectively engaged with two valve seats 3. The valve cover 11 is detachably sealed to the upper opening of the valve body 1. Ball handles 32 are provided on both the upper and lower sides of the ball 5. The two ball handles 32 are coaxial. The upper ball handle 32 is rotatably engaged with the valve cover 11, and the lower ball handle 32 is rotatably engaged with the valve body 1. The actuator 19 is fixed on the valve cover 11 by the bracket 17. The upper end of the valve stem 16 is connected to the output end of the actuator 19. The lower end of the valve stem 16 is provided with a square column head structure. The square column head passes through the valve cover 11 and is inserted into the upper ball handle 32.

[0034] A stuffing box is machined on the upper surface of the valve cover 11. The valve stem 16 passes through the valve cover 11 through the stuffing box. A second graphite sealing ring 12 is provided inside the stuffing box. The valve stem 16 and the valve cover 11 are sealed by rotation through the second graphite sealing ring 12.

[0035] Both the packing gland 14 and the packing sleeve 13 are fitted onto the valve stem 16. The packing gland 14 is connected to the valve cover 11 by a pre-tightening screw. The packing gland 14 presses the second graphite sealing ring 12 onto the bottom surface of the stuffing box through the packing sleeve 13. The upper end face of the packing sleeve 13 is a convex spherical surface, and the lower end face of the packing sleeve 13 is provided with a concave spherical groove. The convex spherical surface and the concave spherical groove are universally fitted.

[0036] The pre-tightening screw passes through the packing gland 14 and is threadedly connected to the valve cover 11. A disc-shaped gasket set 15 is sleeved on the top of the pre-tightening screw. The nut is threadedly engaged with the pre-tightening screw, and the nut presses the disc-shaped gasket set 15 onto the upper surface of the packing gland 14.

[0037] The lower side wall of the valve cavity is provided with a groove 23. The outer periphery of the lower ball handle 32 and the circumferential surface of the groove 23 are rotatably engaged by a sliding bearing 6. A ball thrust pad 4 is provided between the end face of the lower ball handle 32 and the bottom surface of the groove 23.

[0038] The lower end face of the valve cover 11 is provided with a stepped groove. The outer periphery of the upper ball handle 32 and the periphery of the stepped groove are rotatably engaged by a sliding bearing 6. The bottom of the valve stem 16 is provided with a shoulder. A valve stem thrust pad 10 is provided between the upper end face of the shoulder and the bottom face of the stepped groove.

[0039] The outer periphery of the first shaft section 28 has a process groove 31.

[0040] The output end of the actuator 19 is circumferentially engaged with the valve stem 16 via a key 18.

[0041] The valve cover 11 and the valve body 1 are sealed by a metal C-ring 9.

[0042] By tightening the nut on the pre-tightening screw, the second graphite sealing ring 12 is compressed, which can seal the valve stem 16 and the valve cover 11. The bottom of the valve stem 16 is connected to the ball 5 through the square column head structure. The ball 5 and the actuator 19 transmit torque through the valve stem 16, so that the ball 5 can rotate in the 90° direction to cut off and connect the channel.

[0043] This utility model ball valve has a simple structure and can be disassembled and assembled online, such as Figure 5As shown, first remove the valve cover 11. The outer periphery of the valve seat 3 is provided with a process groove 31. Insert the tool 33 into the process groove 31 and apply force to both sides of the two valve seats 3 respectively. The ball 5 can be installed and removed between the two valve seats 3. The ball 5 can enter and exit the valve cavity through the upper opening of the valve body 1. The valve seat 3 and the spring seat 8 can also enter and exit the valve cavity through the upper opening of the valve body 1 for installation and removal. This enables online disassembly and maintenance when the valve is installed on the pipeline.

[0044] The valve seat 3 engages with the ball 5 through the elastic force provided by the disc spring assembly 2. Simultaneously, the disc spring assembly 2 retains its compression, providing sufficient space for the valve seat 3 to retract, ensuring smooth installation and removal of the ball 5. When the valve seat 3 retracts to its final position, the outer end face of the first shaft section 28 engages with the inner end face of the first hole section 20, ensuring that the disc spring assembly 2 is not excessively compressed when the valve seat 3 retracts outward, preventing the elastic force from weakening.

[0045] This utility model uses a first graphite sealing ring 7 and a second graphite sealing ring 12 to seal the valve seat 3 and the valve stem 16, which can meet the requirements of use under high temperature conditions.

[0046] This utility model ball valve has no small parts inside, such as cylindrical springs or screws, ensuring that no parts will fall into the pipeline and cause safety hazards during online disassembly and assembly.

[0047] The ball 5 is designed with ball handles 32 at the top and bottom. The ball 5 has good strength, and the diameter of the upper and lower ball handles 32 is the same. Even if there is a slight deformation, the deformation will be consistent, which can ensure the high sealing performance of the valve.

[0048] The first graphite sealing ring 7 adopts a special structural design, such as Figure 6 As shown, the axial force provided by the disc spring assembly 2 and the medium can be well converted into a radial force for valve sealing, which can achieve high-pressure helium sealing and a high sealing level.

[0049] The packing gland 14 is subjected to the elastic force of the disc gasket group 15, which can ensure sufficient clamping force to press the second graphite sealing ring 12 and ensure valve sealing.

[0050] The above embodiments are merely illustrative examples of the present utility model and do not limit its scope of protection. Those skilled in the art can make partial changes to it, as long as they do not exceed the spirit and essence of the present utility model, they are all within the scope of protection of the present utility model.

Claims

1. A top-mounted high-temperature ball valve that can be disassembled and reassembled online, characterized in that: It includes a valve body (1), a disc spring assembly (2), a valve seat (3), a ball (5), a first graphite sealing ring (7), a spring seat (8), a valve cover (11), a valve stem (16), a bracket (17), and an actuator (19); The valve body (1) is provided with a valve cavity. The medium inlet, medium outlet and upper opening of the valve body (1) are connected through the valve cavity. The end closer to the valve cavity is defined as the inner end and the end farther from the valve cavity is defined as the outer end. The medium inlet and medium outlet are both stepped holes composed of a first hole section (20), a second hole section (21) and a third hole section (22). The first hole section (20), the second hole section (21) and the third hole section (22) are arranged sequentially from the inner end to the outer end. The diameters of the first hole section (20), the second hole section (21) and the third hole section (22) decrease sequentially. The outer periphery of the seat (3) is a stepped shaft composed of a first shaft segment (28), a second shaft segment (29), and a third shaft segment (30), arranged sequentially from the inside to the outside. The diameters of the first hole segment (20), the second hole segment (21), and the third hole segment (22) decrease sequentially. The inner periphery of the spring seat (8) is a stepped hole composed of a fourth hole segment (26) and a fifth hole segment (27), arranged sequentially from the inside to the outside. The diameter of the hole segment (26) is larger than the diameter of the fifth hole segment (27). The outer periphery of the spring seat (8) is a stepped shaft composed of the fourth shaft segment (24) and the fifth shaft segment (25). The fourth shaft segment (24) and the fifth shaft segment (25) are arranged from the inside to the outside. The diameter of the fourth shaft segment (24) is larger than the diameter of the fifth shaft segment (25). The fifth shaft segment (25) is in sliding fit with the second hole segment (21). The fourth shaft segment (24) is in sliding fit with the first hole segment (20). The third shaft segment (30) is in sliding fit with the fourth hole segment (26). The second shaft segment (29) is slidably fitted with the first hole segment (20). A disc spring assembly (2) is sleeved on the fifth shaft segment (25). The two ends of the disc spring assembly (2) abut against the end faces of the second hole segment (21) and the fourth shaft segment (24) respectively. A first graphite sealing ring (7) is sleeved on the third shaft segment (30). The circumferential surface of the third shaft segment (30) and the circumferential surface of the first hole segment (20) are sealed by the first graphite sealing ring (7). The end faces of the second shaft segment (29) and the end faces of the fourth shaft segment (24) are sealed by the first graphite sealing ring (7). The ball (5) enters and exits the valve chamber through the upper opening of the valve body (1). The ball (5) is engaged with two valve seats (3) respectively. The valve cover (11) is detachably sealed to the upper opening of the valve body (1). The ball (5) is provided with ball handles (32) on both the upper and lower sides. The two ball handles (32) are coaxial. The upper ball handle (32) is engaged with the valve cover (11) and the lower ball handle (32) is engaged with the valve body (1). The actuator (19) is fixed on the valve cover (11) by the bracket (17). The upper end of the valve stem (16) is connected to the output end of the actuator (19). The lower end of the valve stem (16) is provided with a square column head structure. The square column head passes through the valve cover (11) and is engaged with the upper ball handle (32).

2. The online detachable high-temperature ball valve according to claim 1, characterized in that: A stuffing box is machined on the upper surface of the valve cover (11), and the valve stem (16) passes through the valve cover (11) through the stuffing box. A second graphite sealing ring (12) is provided inside the stuffing box, and the valve stem (16) and the valve cover (11) are sealed by rotation through the second graphite sealing ring (12).

3. The online detachable high-temperature ball valve according to claim 2, characterized in that: The packing gland (14) and the packing sleeve (13) are both fitted onto the valve stem (16). The packing gland (14) is connected to the valve cover (11) by a pre-tightening screw. The packing gland (14) presses the second graphite sealing ring (12) onto the bottom surface of the stuffing box through the packing sleeve (13). The upper end face of the packing sleeve (13) is a convex spherical surface, and the lower end face of the packing sleeve (13) is provided with a concave spherical groove. The convex spherical surface and the concave spherical groove are universally fitted.

4. The online detachable high-temperature ball valve according to claim 3, characterized in that: The pre-tightening screw passes through the packing gland (14) and is threadedly connected to the valve cover (11). A disc-shaped gasket set (15) is sleeved on the top of the pre-tightening screw. The nut is threadedly engaged with the pre-tightening screw, and the nut presses the disc-shaped gasket set (15) onto the upper surface of the packing gland (14).

5. The online detachable high-temperature ball valve according to claim 1, characterized in that: The lower side wall of the valve chamber is provided with a groove (23), and the outer periphery of the lower ball handle (32) and the circumferential surface of the groove (23) are rotatably engaged by a sliding bearing (6). A ball thrust pad (4) is provided between the end face of the lower ball handle (32) and the bottom surface of the groove (23).

6. The online detachable high-temperature ball valve according to claim 1, characterized in that: The lower end face of the valve cover (11) is provided with a stepped groove. The outer periphery of the upper ball handle (32) and the periphery of the stepped groove are rotated together by a sliding bearing (6). The bottom of the valve stem (16) is provided with a shoulder. A valve stem thrust pad (10) is provided between the upper end face of the shoulder and the bottom face of the stepped groove.

7. The online detachable high-temperature ball valve according to claim 1, characterized in that: The outer periphery of the first shaft section (28) is machined with a process groove (31).

8. A top-mounted high-temperature ball valve that can be disassembled online according to claim 1, characterized in that: The output end of the actuator (19) is circumferentially engaged with the valve stem (16) via a key (18).

9. A top-mounted high-temperature ball valve that can be disassembled online according to any one of claims 1-8, characterized in that: The valve cover (11) and the valve body (1) are sealed by a metal C-ring (9).

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