A high-temperature ball valve

Abstract

This invention belongs to the field of hydraulic valves, specifically relating to a high-temperature ball valve. The ball valve includes a main valve body and a side valve body. A valve core is disposed within the valve cavity of the main valve body. A sealing assembly is disposed between the side valve body and the valve core, and the sealing assembly is in sealing contact with the valve core. The sealing assembly includes a valve seat, a valve seat pressure ring, a spring, and an elastic sealing ring. This ball valve abandons the graphite or rubber seals used in existing technologies, employing a sealing structure adapted to high-temperature and highly oxidizing conditions. This sealing structure improves the valve's sealing performance and effectively prevents oxidation and burn-out when conveying high-temperature and highly oxidizing media, thus avoiding internal or external leakage.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic valves, and specifically relates to a high-temperature ball valve. Background Technology

[0002] Conventional high-temperature valves typically use graphite or rubber as their primary sealing components. However, in engineering practice, it has been found that when conveying high-temperature, highly oxidizing media such as steam and oxygen, these graphite or rubber seals can oxidize or burn out during use. This leads to seal failure, making the valve prone to leakage and creating safety hazards. Furthermore, it has been observed that during long-term use, the springs in the sealing structure of conventional high-temperature valves are prone to malfunction, resulting in decreased sealing performance and also increasing the likelihood of leakage. Summary of the Invention

[0003] To address the problems existing in the prior art, the purpose of this invention is to provide a high-temperature ball valve. This ball valve abandons the graphite or rubber seals used in the prior art and adopts a sealing structure adapted to high-temperature and strong oxidizing conditions. This sealing structure improves the valve's sealing performance and effectively avoids oxidation and burn-out when the valve is transporting high-temperature and strong oxidizing media, thus preventing internal or external leakage.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0005] A high-temperature ball valve includes a main valve body and a side valve body. A valve core is disposed within the valve cavity of the main valve body, and a sealing assembly is disposed between the side valve body and the valve core, the sealing assembly being in sealing contact with the valve core.

[0006] The sealing assembly includes a valve seat, a valve seat pressure ring, springs, and an elastic sealing ring. The valve seat has a main body, one end of which is provided with a sealing part that mates with the valve core. The other end of the main body is provided with a mounting part and a positioning part. The positioning part is inserted into the side valve body. The elastic sealing ring is provided on the outer circumferential surface of the mounting part. The valve seat pressure ring is sleeved on the outer circumference of the valve seat and pressed against the sealing surface of the side valve body by a first screw. A plurality of springs are evenly arranged along the circumferential direction of the side valve body. One end of each spring abuts against the side valve body, and the other end abuts against the end face of the mounting part. The preload provided by the plurality of springs ensures that the sealing part and the valve core are in sealing contact.

[0007] Preferably, the side valve body is provided with a first mounting groove, a second mounting groove, a first recess, and a second recess, and in the radial direction of the side valve body, the first recess and the second recess are located between the first mounting groove and the second mounting groove;

[0008] The first groove is provided with a sealing boss extending along the axial direction of the side valve body. The end of the sealing boss is provided with a sealing surface that abuts against the elastic sealing ring. The outer peripheral surface of the mounting part cooperates with the second groove. A spring cavity is opened in the second groove, and the spring is disposed in the spring cavity.

[0009] The positioning part is inserted into the first mounting groove and has a gap with the bottom surface of the first mounting groove. The valve seat pressure ring is located in the second mounting groove, and when the valve seat pressure ring abuts against the bottom of the second mounting groove, the distance between the valve seat pressure ring and the sealing surface at the end of the sealing boss is less than or equal to the thickness of the elastic sealing ring.

[0010] Preferably, a plurality of first concentric water ripple lines are provided on the sealing surface at the end of the sealing boss, and a plurality of second concentric water ripple lines are provided on the end face of the valve seat pressure ring that abuts against the elastic sealing ring.

[0011] Preferably, along the radial direction of the side valve body, the first screw is located on the upper side of the elastic sealing ring, and a threaded hole is provided in the first groove located on the upper side of the sealing boss. After the first screw passes through the valve seat pressure ring, it engages with the threaded hole to install the upper side of the valve seat pressure ring into the second mounting groove and press the elastic sealing ring.

[0012] A high-temperature ball valve includes a main valve body and a side valve body. A valve core is disposed within the valve cavity of the main valve body, and a sealing assembly is disposed between the side valve body and the valve core, the sealing assembly being in sealing contact with the valve core.

[0013] The sealing assembly includes a valve seat, a valve seat pressure ring, springs, and an elastic sealing ring. The valve seat has a main body, one end of which is provided with a sealing part that mates with the valve core. The other end of the main body is provided with a mounting part and a positioning part. The positioning part is inserted into the side valve body. The elastic sealing ring is provided on the outer circumferential surface of the mounting part. The valve seat pressure ring is sleeved on the outer circumference of the valve seat and pressed against the sealing surface of the side valve body by a first screw. A plurality of springs are evenly arranged along the circumferential direction of the side valve body. One end of each spring abuts against the side valve body, and the other end abuts against the end face of the mounting part. The preload provided by the plurality of springs ensures that the sealing part and the valve core are in sealing contact.

[0014] The elastic sealing ring includes a sealing section, an elastic connecting section, and an installation section connected in sequence. The sealing section is disposed between the valve seat pressure ring and the sealing boss. The installation section is located on the outer peripheral surface of the mounting part and abuts against the end face of the main body. The elastic connecting section bends toward the side closer to the spring and forms an elastic force that drives the valve seat to move toward the side closer to the valve core.

[0015] Preferably, the sealing section, the elastic connecting section, and the mounting section are sequentially welded to form the elastic sealing ring; the mounting section is welded to the outer peripheral surface of the mounting part and the end face of the main body part; the elastic connecting section and the sealing section, as well as the elastic connecting section and the mounting section, adopt an arc-shaped curved surface for smooth transition.

[0016] Preferably, the sealing section and the mounting section of the elastic sealing ring are standard circular parts, and the elastic connecting section of the elastic sealing ring is a tapered circular structure with an initial taper, the initial taper of the elastic connecting section being adjustable.

[0017] Preferably, along the radial direction of the side valve body, the first screw is located on the upper side of the sealing section, and a first threaded hole is provided in the side valve body located on the upper side of the sealing boss. After the first screw passes through the valve seat pressure ring, it engages with the first threaded hole to install the upper side of the valve seat pressure ring into the side valve body and initially press the sealing section.

[0018] Along the axial direction of the valve seat pressure ring, a sliding groove is provided on the valve seat pressure ring that is directly opposite to the sealing section, and a second threaded hole communicating with the sliding groove. A clamping ring is slidably disposed in the sliding groove, and a second screw is disposed in the second threaded hole. The end of the second screw abuts against the clamping ring. The sealing section is further clamped by adjusting the second screw.

[0019] Preferably, a plurality of first concentric water ripple lines are provided on the sealing surface at the end of the sealing boss, and a plurality of second concentric water ripple lines are provided on the end face of the clamping ring that abuts against the sealing section. The number of the plurality of first concentric water ripple lines provided on the sealing boss is greater than the number of the plurality of second concentric water ripple lines provided on the clamping ring.

[0020] Preferably, a pressure cap is provided at the upper end of the main valve body, the upper valve stem passes through the pressure cap and the main valve body and is connected to the upper end of the valve core in a driving connection, and the lower valve stem passes through the main valve body and is rotatably connected to the lower end of the valve core;

[0021] A combined packing is provided between the gland and the upper valve stem, and a packing pressure ring is provided at the upper end of the combined packing. The packing pressure ring is connected to the gland by threaded fasteners.

[0022] The combined packing includes a first combined packing and a second combined packing, and a packing spacer ring is provided between the first combined packing and the second combined packing.

[0023] Both the first and second combined packings consist of two vermiculite packings located at the upper and lower ends and four to five graphite packings located in the middle of the vermiculite packings.

[0024] Compared with the prior art, the high-temperature ball valve provided by the present invention has the following beneficial technical effects:

[0025] 1. The sealing assembly in this invention, located within a ball valve, includes a valve seat, a valve seat pressure ring, a spring, and an elastic sealing ring. A sealing portion is located at the head of the valve seat, which cooperates with the valve core to achieve a spherical seal. Several springs within the side valve body provide the pre-tightening force required for the valve core seal, ensuring a tight seal between the sealing portion and the valve core. This effectively prevents leakage of the medium into the valve cavity via the valve core seal when the valve is conveying high-temperature, highly oxidizing media such as steam or oxygen. Furthermore, by providing an elastic sealing ring at the outer end of the valve seat and machining concentric watermarks on the sealing surfaces of the side valve body and the valve seat pressure ring that contact the elastic sealing ring, a labyrinth seal is formed on both sides of the elastic sealing ring, effectively improving sealing reliability. The elastic sealing ring is pressed between the valve seat pressure ring and the sealing boss, forming a hard seal structure that effectively prevents medium leakage between the first groove and the valve cavity, thereby improving the sealing performance of the valve when conveying high-temperature, highly oxidizing media such as steam or oxygen.

[0026] 2. This invention configures the elastic sealing ring as comprising a sealing section, an elastic connecting section, and an installation section welded sequentially, wherein the elastic connecting section is bent towards the side closer to the spring. This structure has at least two functions: firstly, it prevents the medium from leaking into the valve cavity through the first groove via the sealing section; secondly, it provides partial preload for the seal between the valve seat and the valve core via the elastic connecting section. This configuration not only shares the preload required by the spring, reducing the load on the spring and increasing its service life, but also reduces the adverse effects of impact loads during valve use on the spring's lifespan.

[0027] 3. In this invention, the sealing section and the installation section are set as standard parts, and the elastic connection section is set as a conical ring structure with a certain initial taper and the initial taper can be adjusted. When preparing the elastic sealing ring, the size of the initial taper of the elastic connection section can be adjusted to achieve flexible adjustment of the preload provided by the elastic sealing ring.

[0028] 4. This invention initially tightens the sealing section by placing a first screw on the upper side of the sealing section and using it to install the valve seat pressure ring into the second mounting groove. A clamping ring, directly opposite the sealing section, is positioned below the valve seat pressure ring and can slide axially relative to it. A second screw pushes the clamping ring axially to further tighten the sealing section. Compared to using only the first screw to tighten the sealing section, this provides a uniform sealing clamping force, improving the sealing performance. Furthermore, adjusting the second screw allows for further adjustment of the sealing preload, enhancing valve adaptability. Secondly, when the medium leaks into the first groove, it first contacts the sealing surface on the sealing boss. By setting the number of first concentric watermarks on the sealing boss to be greater than the number of second concentric watermarks on the clamping ring, the medium is more effectively blocked, improving the sealing performance of the sealing section.

[0029] 5. The valve stem seal of this invention employs a two-set combined packing sealing structure, with the two sets of combined packing separated by a packing spacer ring. When the lower set of combined packing fails during long-term use, the upper set can still achieve a sealing effect. This dual-packing sealing structure makes the valve stem sealing more reliable. The combined packing uses vermiculite packing + graphite packing. Besides its sealing function, the vermiculite packing effectively isolates the medium, reducing heat conduction from the medium to the graphite packing. This prevents high-temperature, highly oxidizing media from directly contacting the graphite packing, which could cause graphite burnout and lead to valve stem leakage. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the high-temperature ball valve of the present invention;

[0031] Figure 2 This is a schematic diagram of the sealing assembly in the first embodiment of the present invention;

[0032] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle;

[0033] Figure 4 This is a schematic diagram of the sealing assembly in the second embodiment of the present invention;

[0034] Figure 5 for Figure 4 A magnified view of a portion of point B in the middle;

[0035] Figure 6 A comparative diagram showing the elastic sealing ring before and after assembly;

[0036] Figure 7 This is a schematic diagram of the valve stem sealing structure of the present invention.

[0037] The meanings of the symbols marked in the figure are as follows:

[0038] 1. Side valve body; 2. Valve core; 3. Sealing assembly; 4. Main valve body; 5. Upper valve stem; 6. Gland; 7. Lower valve stem; 8. Packing ring; 9. Combined packing;

[0039] 11. First groove; 12. Second groove; 13. Spring cavity; 14. Sealing boss; 15. Second mounting groove; 16. First mounting groove; 17. First screw;

[0040] 91. Packing spacer ring; 92. First combination packing; 93. Second combination packing;

[0041] 141. First concentric water ripple line;

[0042] 31. Valve seat; 32. Valve seat pressure ring; 33. Spring; 34. Elastic sealing ring; 35. Second screw; 36. Clamping ring;

[0043] 311. Mounting part; 312. Sealing part; 313. Positioning part; 314. Main body part; 315. Outer peripheral surface; 316. End face;

[0044] 321. Second concentric water ripple line; 322. Slide groove;

[0045] 341. Sealing section; 342. Flexible connection section; 343. Installation section. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0047] Therefore, the following detailed description of embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely illustrates some embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0048] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0049] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0050] In the description of this invention, it should be noted that the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. These terms are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0051] See appendix Figure 1 - Appendix Figure 7 As shown, the present invention discloses a high-temperature ball valve, which includes a main valve body 4 and a side valve body 1. A valve core 2 is provided in the valve cavity of the main valve body 4. A pressure cap 6 is provided at the upper end of the main valve body 4. The upper valve stem 5 passes through the pressure cap 6 and the main valve body 4 and is connected to the upper end of the valve core 2. The lower valve stem 7 passes through the main valve body 4 and is rotatably connected to the lower end of the valve core 2.

[0052] A combined packing 9 is installed between the gland 6 and the upper valve stem 5. A packing ring 8 is installed at the upper end of the combined packing 9, and the packing ring 8 is connected to the gland 6 by threaded fasteners. A butterfly spring is installed between the threaded fasteners and the packing ring 8. The butterfly spring generates preload on the packing ring 8. During long-term use of the valve, when the upper valve stem 5 wears on the combined packing 9 due to valve opening and closing, the preload will continuously compress the combined packing 9, making the seal at the upper valve stem 5 more reliable.

[0053] The side valve body 1 is provided with a fixed channel for the flow of medium, and the valve core 2 is provided with a corresponding movable channel that works in conjunction with the fixed channel. A sealing assembly 3 is provided between the side valve body 1 and the valve core 2. The sealing assembly 3 is in sealing contact with the valve core 2 to form an effective seal between the upstream and downstream ends of the ball valve and the valve cavity.

[0054] The sealing assembly 3 includes a valve seat 31, a valve seat pressure ring 32, a spring 33, and an elastic sealing ring 34. The valve seat 31 has a main body 314, one end of which is provided with a sealing part 312, which cooperates with the valve core 2. The other end of the main body 314 is provided with a mounting part 311 and a positioning part 313. The positioning part 313 is inserted into the side valve body 1. An elastic sealing ring 34 is provided on the outer peripheral surface 315 of the mounting part 311, and the elastic sealing ring 34 is welded. The valve seat pressure ring 32 is sleeved on the outer periphery 315 of the mounting part 311 and the end face 316 of the main body part 314. The elastic sealing ring 34 is pressed against the sealing surface of the side valve body 1 by the first screw 17. A plurality of springs 33 are evenly arranged along the circumferential direction of the side valve body 1. One end of the spring 33 abuts against the side valve body 1, and the other end abuts against the end face of the mounting part 311. The preload provided by the plurality of springs 33 makes the sealing part 312 and the valve core 2 in a sealing contact.

[0055] Preferably, the side valve body 1 is provided with a first mounting groove 16, a second mounting groove 15, a first recess 11, and a second recess 12. In the radial direction of the side valve body 1, the first recess 11 and the second recess 12 are located between the first mounting groove 16 and the second mounting groove 15. A sealing boss 14 extending along the axial direction of the side valve body 1 is provided in the first recess 11. The end of the sealing boss 14 is provided with a sealing surface that abuts against the elastic sealing ring 34. The outer peripheral surface 315 of the mounting part 311 mates with the second recess 12. A spring cavity 13 is provided in the two grooves 12, and a spring 33 is disposed in the spring cavity 13. The positioning part 313 is inserted into the first mounting groove 16 and has a gap with the bottom surface of the first mounting groove 16. The valve seat pressure ring 32 is located in the second mounting groove 15. When the valve seat pressure ring 32 abuts against the bottom of the second mounting groove 15, the distance between the valve seat pressure ring 32 and the sealing surface at the end of the sealing boss 14 is less than or equal to the thickness of the elastic sealing ring 34, so that the valve seat pressure ring 32 can press the elastic sealing ring 34 tightly onto the sealing boss 14.

[0056] Along the radial direction of the side valve body 1, the first screw 17 is located on the upper side of the elastic sealing ring 34. A threaded hole is provided in the first groove 11 on the upper side of the sealing boss 14. After the first screw 17 passes through the valve seat pressure ring 32, it engages with the threaded hole to install the upper side of the valve seat pressure ring 32 into the second mounting groove 15 and press the elastic sealing ring 34.

[0057] When the valve is conveying high-temperature, strong oxidizing media such as steam and oxygen, the sealing fit between the valve seat 31 and the valve core 2 prevents the media from leaking into the valve cavity through the valve core seal. However, some media may leak into the first groove 11 through the first mounting groove 16 and the second groove 12. In this invention, an elastic sealing ring 34 is provided between the valve seat pressure ring 32 and the sealing boss 14, forming a hard seal structure, which can effectively prevent the media from further leaking into the valve cavity.

[0058] Preferably, a plurality of first concentric water ripple lines 141 are provided on the sealing surface at the end of the sealing boss 14, and a plurality of second concentric water ripple lines 321 are provided on the end face where the valve seat pressure ring 32 and the elastic sealing ring 34 abut.

[0059] In the above embodiments, the sealing assembly inside the ball valve includes a valve seat, a valve seat pressure ring, a spring, and an elastic sealing ring. A sealing part is provided at the head of the valve seat, which cooperates with the valve core to achieve a spherical seal. Several springs provided in the side valve body provide the pre-tightening force required for the valve core seal, so that the sealing part and the valve core can make a sealing contact. Thus, when the valve is conveying high-temperature and strong oxidizing media such as steam and oxygen, it can effectively prevent the medium from leaking into the valve cavity through the valve core seal. Secondly, by providing an elastic sealing ring at the outer end of the valve seat, and machining concentric water ripples on the sealing surfaces of the side valve body and the valve seat pressure ring that contact the elastic sealing ring, a labyrinth seal is formed on both sides of the elastic sealing ring, which effectively improves the sealing reliability. The elastic sealing ring is pressed between the valve seat pressure ring and the sealing boss, forming a hard seal structure, which can effectively prevent medium leakage between the first groove and the valve cavity, thereby improving the sealing performance of the valve when conveying high-temperature and strong oxidizing media such as steam and oxygen.

[0060] Furthermore, to effectively delay spring failure, the present invention provides the following preferred embodiments:

[0061] See appendix Figure 4 - Appendix Figure 6 As shown, the elastic sealing ring 34 includes a sealing section 341, an elastic connecting section 342, and an mounting section 343 connected in sequence. The sealing section 341 is disposed between the valve seat pressure ring 32 and the sealing boss 14. The mounting section 343 is located on the outer peripheral surface 315 of the mounting part 311 and abuts against the end face 316 of the main body part 314. The elastic connecting section 342 is bent toward the side closer to the spring 33 and has a certain elasticity, so that the elastic connecting section 342 generates an elastic force that drives the valve seat 31 to move toward the side closer to the valve core 2. This elastic force is used to provide part of the pre-tightening force required for sealing between the valve seat 31 and the valve core 2.

[0062] Preferably, the sealing section 341, the elastic connecting section 342, and the mounting section 343 are sequentially welded to form an elastic sealing ring 34; the mounting section 343 is welded to the outer peripheral surface 315 of the mounting part 311 and the end face 316 of the main body part 314, and the elastic connecting section 342 and the sealing section 341, as well as the elastic connecting section 342 and the mounting section 343, adopt an arc-shaped curved surface for smooth transition.

[0063] Preferably, the sealing section 341 and mounting section 343 of the elastic sealing ring 34 are standard annular parts, and the elastic connecting section 342 of the elastic sealing ring 34 is a conical annular structure. The initial taper of the elastic connecting section 342 is adjustable. The elastic connecting section 342 provides part of the preload through its own elastic deformation. Different initial tapers can provide different amounts of preload, and the initial taper of the elastic connecting section 342 can be adjusted according to the required preload. When manufacturing the elastic sealing ring 34, the sealing section 341 and mounting section 343 are standard parts and can be directly selected, while the elastic connecting section 342 is a non-standard part, and different initial tapers of the elastic connecting section 342 are selected according to the required preload.

[0064] As attached Figure 6 As shown, when the sealing section 341 is pressed between the valve seat pressure ring 32 and the sealing boss 14, the elastic connecting section 342 is in its initial state, possessing an initial taper, as shown in the attached figure. Figure 6 As shown in the attached left figure; when the valve core 2 is assembled into the valve, the valve core 2 drives the valve seat 31 to move, causing the elastic connecting section 342 to undergo elastic deformation. The first groove 11 can be used to accommodate the elastic deformation generated by the elastic connecting section 342. At this time, the elastic connecting section 342 is in the working state and generates elastic force. This elastic force is used to provide part of the preload required for sealing between the valve seat 31 and the valve core 2, as shown in the attached figure. Figure 6 As shown in the attached diagram on the right, the elastic connecting sections 342 with different initial tapers can provide different amounts of preload when in operation, enabling flexible adjustment of the preload provided by the elastic sealing ring.

[0065] In the above embodiment, the elastic sealing ring is configured to include a sealing section, an elastic connecting section, and an mounting section welded sequentially, wherein the elastic connecting section is bent towards the side closer to the spring. This structure has at least two functions: firstly, it prevents the medium from leaking into the valve cavity through the first groove via the sealing section; secondly, it provides partial preload for the seal between the valve seat and the valve core via the elastic connecting section. This configuration not only shares the preload required by the spring, reducing the load on the spring and increasing its service life, but also reduces the adverse effects of impact loads during valve operation on the spring's lifespan.

[0066] Furthermore, the sealing section and mounting section are set as standard parts, and the elastic connecting section is set as a conical ring structure with a certain initial taper and an adjustable initial taper. During the fabrication of the elastic sealing ring, the magnitude of the preload provided by the elastic sealing ring can be flexibly adjusted by adjusting the initial taper of the elastic connecting section.

[0067] Furthermore, when using the first screw to install the valve seat pressure ring to tighten the sealing section, the sealing force on the upper and lower sides of the sealing section is uneven in the current installation structure, which will have an adverse effect on the sealing performance.

[0068] Therefore, in the following preferred embodiments, the following sealing structure compression method is adopted:

[0069] Along the radial direction of the side valve body 1, the first screw 17 is located on the upper side of the sealing section 341. A first threaded hole is provided in the first groove 11 on the upper side of the sealing boss 14. After the first screw 17 passes through the valve seat pressure ring 32, it engages with the first threaded hole to install the upper side of the valve seat pressure ring 32 into the second mounting groove 15 and initially press the sealing section 341.

[0070] Along the axial direction of the valve seat pressure ring 32, a sliding groove 322 is provided on the valve seat pressure ring 32, which is directly opposite to the sealing section 341, and a second threaded hole communicating with the sliding groove 322. The width of the sliding groove 322 is equal to or slightly larger than the width of the sealing boss 14. A clamping ring 36 is slidably arranged in the sliding groove 322, and a second screw 35 is provided in the second threaded hole. The end of the second screw 35 abuts against the clamping ring 36. The sealing section 341 is further clamped by adjusting the second screw 35.

[0071] Preferably, a plurality of second concentric water ripple lines 321 are provided on the end face of the clamping ring 36 abutting against the sealing section 341, and the number of a plurality of first concentric water ripple lines 141 provided on the sealing boss 14 is greater than the number of a plurality of second concentric water ripple lines 321 provided on the clamping ring 36.

[0072] In the above embodiment, by placing the first screw on the upper side of the sealing section, the valve seat pressure ring is installed into the second mounting groove using the first screw to initially tighten the sealing section. A clamping ring is then placed on the lower side of the valve seat pressure ring, directly opposite the sealing section. This clamping ring can slide axially relative to the valve seat pressure ring. The second screw pushes the clamping ring axially to further tighten the sealing section. Compared to using only the first screw to tighten the sealing section, this provides a uniform sealing clamping force, improving the sealing performance at the sealing section. Furthermore, adjusting the second screw allows for further adjustment of the sealing preload, improving the valve's adaptability.

[0073] Secondly, when the medium leaks into the first groove, it will first come into contact with the sealing surface on the sealing boss. By setting the number of first concentric water ripples on the sealing boss to be greater than the number of second concentric water ripples on the compression ring, the medium can be more effectively blocked, and the sealing performance of the sealing section can be improved.

[0074] Preferably, the combined packing 9 includes a first combined packing 92 and a second combined packing 93, with a packing spacer ring 91 provided between the first combined packing 92 and the second combined packing 93; both the first combined packing 92 and the second combined packing 93 are composed of two vermiculite packings located at the upper and lower ends and 4 to 5 graphite packings located in the middle of the vermiculite packings.

[0075] In the above embodiment, the valve stem seal employs a two-set combined packing sealing structure, with the two sets of combined packing separated by a packing spacer ring. When the lower set of combined packing fails during long-term use, the upper set can still achieve a sealing effect. This double-packing sealing structure makes the valve stem seal more reliable. The combined packing uses a combination of vermiculite and graphite packing. Besides its sealing function, the vermiculite packing effectively isolates the medium, reducing heat conduction from the medium to the graphite packing. This prevents high-temperature, highly oxidizing media from directly contacting the graphite packing, which could cause graphite burn-out and lead to valve stem leakage.

[0076] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described herein. Although the present invention has been described in detail with reference to the above embodiments, the present invention is not limited to the specific embodiments described above. Therefore, any modifications or equivalent substitutions to the present invention, as well as all technical solutions and improvements that do not depart from the spirit and scope of the invention, are covered within the scope of the claims of the present invention.

Claims

1. A high-temperature ball valve, characterized in that: The ball valve includes a main valve body and a side valve body. A valve core is disposed within the valve cavity of the main valve body. A sealing assembly is disposed between the side valve body and the valve core, and the sealing assembly is in sealing contact with the valve core. The sealing assembly includes a valve seat, a valve seat pressure ring, springs, and an elastic sealing ring. The valve seat has a main body, one end of which is provided with a sealing part that mates with the valve core. The other end of the main body is provided with a mounting part and a positioning part. The positioning part is inserted into the side valve body. The elastic sealing ring is provided on the outer circumferential surface of the mounting part. The valve seat pressure ring is sleeved on the outer circumference of the valve seat and pressed against the sealing surface of the side valve body by a first screw. A plurality of springs are evenly arranged along the circumferential direction of the side valve body. One end of each spring abuts against the side valve body, and the other end abuts against the end face of the mounting part. The preload provided by the plurality of springs ensures that the sealing part and the valve core are in sealing contact. The side valve body is provided with a first mounting groove, a second mounting groove, a first recess, and a second recess. In the radial direction of the side valve body, the first recess and the second recess are located between the first mounting groove and the second mounting groove. The first groove is provided with a sealing boss extending along the axial direction of the side valve body. The end of the sealing boss is provided with a sealing surface that abuts against the elastic sealing ring. The outer peripheral surface of the mounting part cooperates with the second groove. A spring cavity is opened in the second groove, and the spring is disposed in the spring cavity. The positioning part is inserted into the first mounting groove and has a gap with the bottom surface of the first mounting groove. The valve seat pressure ring is located in the second mounting groove, and when the valve seat pressure ring abuts against the bottom of the second mounting groove, the distance between the valve seat pressure ring and the sealing surface at the end of the sealing boss is less than or equal to the thickness of the elastic sealing ring. The elastic sealing ring includes a sealing section, an elastic connecting section and a mounting section connected in sequence. The sealing section is disposed between the valve seat pressure ring and the sealing boss. The mounting section is located on the outer peripheral surface of the mounting part and abuts against the end face of the main body. The elastic connecting section is bent toward the side closer to the spring. The elastic connecting section generates an elastic force that drives the valve seat to move toward the side closer to the valve core. A pressure cap is provided at the upper end of the main valve body. The upper valve rod passes through the pressure cap and the main valve body and is connected to the upper end of the valve core. The lower valve rod passes through the main valve body and is rotatably connected to the lower end of the valve core. A combined packing is provided between the gland and the upper valve stem, and a packing pressure ring is provided at the upper end of the combined packing. The packing pressure ring is connected to the gland by threaded fasteners. The combined packing includes a first combined packing and a second combined packing, and a packing spacer ring is provided between the first combined packing and the second combined packing. Both the first and second combined packings consist of two vermiculite packings located at the upper and lower ends and four to five graphite packings located in the middle of the vermiculite packings.

2. The ball valve as described in claim 1, characterized in that: A plurality of first concentric water ripple lines are provided on the sealing surface at the end of the sealing boss, and a plurality of second concentric water ripple lines are provided on the end face of the valve seat pressure ring that abuts against the elastic sealing ring.

3. The ball valve as described in claim 2, characterized in that: Along the radial direction of the side valve body, the first screw is located on the upper side of the elastic sealing ring, and a threaded hole is provided in the first groove located on the upper side of the sealing boss. After the first screw passes through the valve seat pressure ring, it engages with the threaded hole to install the upper side of the valve seat pressure ring into the second mounting groove and press the elastic sealing ring.

4. The ball valve as described in claim 1, characterized in that: The sealing section, the elastic connecting section, and the mounting section are sequentially welded together to form the elastic sealing ring; the mounting section is welded to the outer peripheral surface of the mounting part and the end face of the main body part; the elastic connecting section and the sealing section, as well as the elastic connecting section and the mounting section, adopt a smooth arc-shaped curved surface transition.

5. The ball valve as described in claim 4, characterized in that: The sealing section and the mounting section of the elastic sealing ring are standard circular parts, and the elastic connecting section of the elastic sealing ring is a tapered circular structure with an initial taper, the initial taper of the elastic connecting section being adjustable.

6. The ball valve as described in claim 5, characterized in that: Along the radial direction of the side valve body, the first screw is located on the upper side of the sealing section. A first threaded hole is provided in the side valve body located on the upper side of the sealing boss. After the first screw passes through the valve seat pressure ring, it engages with the first threaded hole to install the upper side of the valve seat pressure ring into the side valve body and initially press the sealing section. Along the axial direction of the valve seat pressure ring, a sliding groove is provided on the valve seat pressure ring that is directly opposite to the sealing section, and a second threaded hole communicating with the sliding groove. A clamping ring is slidably disposed in the sliding groove, and a second screw is disposed in the second threaded hole. The end of the second screw abuts against the clamping ring. The sealing section is further clamped by adjusting the second screw.

7. The ball valve as described in claim 6, characterized in that: A plurality of first concentric water ripple lines are provided on the sealing surface at the end of the sealing boss, and a plurality of second concentric water ripple lines are provided on the end face of the clamping ring that abuts against the sealing section. The number of the plurality of first concentric water ripple lines provided on the sealing boss is greater than the number of the plurality of second concentric water ripple lines provided on the clamping ring.

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