Ultrahigh-pressure high-temperature wear-resistant ball valve

Abstract

The ultrahigh-pressure high-temperature wear-resistant ball valve comprises a valve body, a valve rod and a ball body, a valve cavity is formed in the valve body, an inlet flow channel and an outlet flow channel which communicate with the valve cavity are formed in the two ends of the valve body correspondingly, and an upper shaft hole and a lower shaft hole which communicate with the valve cavity are formed in the upper end and the lower end of the valve body correspondingly; the valve rod is arranged on the upper shaft hole in a penetrating mode, the inner end of the valve rod is in linkage connection with the ball arranged in the valve cavity, and an inlet valve seat assembly and an outlet valve seat assembly are arranged at the inner end of the inlet flow channel and the inner end of the outlet flow channel respectively. A bottom sealing mechanism is further included and comprises a gland and a plug, a sealing step is arranged in the lower shaft hole, a conical face is arranged on the plug, the plug and the gland are locked and connected together through a first screw, the conical face abuts against the sealing step, and meanwhile the gland abuts against the position, corresponding to the outer end of the lower shaft hole, of the valve body. The valve has excellent sealing performance, and long-term reliable and safe operation of the valve at ultra-high temperature and ultra-high pressure is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to an ultra-high pressure and high temperature wear-resistant ball valve. Background Art

[0002] With the rapid development of large-scale petrochemical and new energy industries, the parameter requirements of industrial equipment are getting higher and higher. For example, the medium operating pressure of high-pressure hydrogenation equipment is as high as 2500Lb, and the medium temperature is as high as 560℃ or above. The pressure of high-pressure steam in large thermal power generation equipment is as high as 4500Lb, and the operating temperature is as high as 566℃. The medium temperature of polysilicon reduction section is as high as 800℃, etc. The improvement of the technical parameters of equipment and working conditions has put forward higher technical requirements for valve performance and safety.

[0003] Ultra-high temperature and ultra-high pressure working conditions bring many problems to valves, including internal sealing performance problems, external sealing performance problems, material adaptability problems, structural safety problems, operational safety and reliability problems, and service life problems. These will force industry technicians to innovate and design new, high-parameter, safer and more reliable valves for application.

[0004] Especially for the problem of sealing at the bottom of the valve body, the valve stem extends from the bottom of the valve body and part of the valve stem extends from the top of the valve body. Usually, after the valve stem is installed, an end cover is installed on the axial hole at the bottom of the valve body, and the end cover is connected to the valve body with screws. A sealing gasket is sandwiched between the end cover and the valve body. However, this kind of sealing structure is prone to sealing failure due to high pressure and thermal expansion and contraction under high pressure and high temperature environment, and the sealing and structural safety are poor. Summary of the invention

[0005] The object of the present invention is to provide an ultra-high pressure and high temperature wear-resistant ball valve, which has excellent sealing performance and ensures long-term reliable and safe operation of the valve under ultra-high temperature and ultra-high pressure.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an ultra-high pressure and high temperature wear-resistant ball valve, comprising a valve body, a valve stem and a ball, a valve cavity is arranged in the valve body, an inlet flow channel and an outlet flow channel connected to the valve cavity are respectively arranged at two ends of the valve body, an upper shaft hole and a lower shaft hole connected to the valve cavity are respectively opened at the upper and lower ends of the valve body, the valve stem is inserted into the upper shaft hole, and the inner end of the valve stem is linked to the ball arranged in the valve cavity, the inner ends of the inlet flow channel and the outlet flow channel are respectively provided with an inlet valve seat assembly and an outlet valve seat assembly for forming a sealing match with the ball when the valve is closed; and also includes a bottom sealing mechanism, the bottom sealing mechanism includes a pressure cover and a plug, a sealing step is arranged in the lower shaft hole, a conical surface is arranged on the plug, the plug and the pressure cover are locked and connected together by a first screw, so that the conical surface is tightly abutted against the sealing step, and at the same time, the pressure cover and the valve body are tightly abutted at the position corresponding to the outer end of the lower shaft hole.

[0007] By adopting the above technical solution, a bottom sealing mechanism is arranged on the lower shaft hole, and the plug and the pressure cover are locked together by a first screw, so that the conical surface is tightly abutted against the sealing step, and at the same time, the pressure cover and the valve body are tightly abutted at the position corresponding to the outer end of the lower shaft hole, and the two are hard seals. No matter how the working medium temperature and working pressure change, it can be ensured that the bottom of the valve body used for valve stem installation is completely sealed without any leakage.

[0008] The present invention is further configured such that the bottom sealing mechanism also includes a bottom packing assembly, the bottom packing assembly includes a bottom packing, a pressure ring, a spring seat and a plurality of springs, a lower sealing groove is provided at the outer end of the lower shaft hole, and when the pressure cover is locked and connected with the plug, the pressure cover presses the spring seat, the plurality of springs, the pressure ring and the bottom packing in the lower sealing groove in sequence, and the inner circular surface of the bottom packing is tightly fitted with the outer circular surface of the plug, the outer circular surface of the bottom packing is tightly fitted with the inner circular surface of the lower sealing groove, and a floating gap is provided between the spring seat and the pressure ring.

[0009] By adopting the above technical scheme, when the conical surface on the plug is tightly fitted with the sealing step in the lower shaft hole for sealing, the pressure cover pushes the spring seat, and the spring pushes the pressure ring to the bottom filler to achieve the second seal for the plug. After the bottom sealing mechanism is installed, a floating gap is maintained between the upper end face of the spring seat and the pressure ring, which can prevent the expansion of components such as the bottom filler caused by high temperature. The bottom filler fits tightly with the inner end face of the lower sealing groove, and the corresponding surface reaches the smoothness required for sealing, which plays the role of the third insurance for the bottom seal.

[0010] The present invention is further configured such that a positioning groove for embedding one end of the spring is provided on the spring seat.

[0011] By adopting the above technical solution, the spring can be positioned and the stability of the spring installation can be improved.

[0012] The present invention is further configured such that the valve body comprises a valve body and a valve cover, the valve body and the valve cover are detachably connected together by bolts, the valve cavity is arranged in the valve body, and the inlet flow channel and the outlet flow channel are respectively arranged on the valve body and the valve cover.

[0013] By adopting the above technical solution, the valve body is designed as a detachable structure, which is convenient for assembling internal parts such as a ball.

[0014] The present invention is further configured such that, after the valve body and the valve cover are installed, a wedge-shaped sealing cavity is provided between the valve body and the valve cover, a wedge-shaped sealing gasket is provided in the wedge-shaped sealing cavity, a first inclined surface, a second inclined surface, a third inclined surface and a fourth inclined surface are provided on the wedge-shaped sealing gasket, a first sealing inclined surface is provided at a portion of the valve body corresponding to the wedge-shaped sealing cavity, and a second sealing inclined surface is provided at a portion of the valve cover corresponding to the wedge-shaped sealing cavity, the first inclined surface and the second inclined surface of the wedge-shaped sealing gasket are tightly matched with the first sealing inclined surface on the valve body, the third inclined surface and the fourth inclined surface of the wedge-shaped sealing gasket are tightly matched with the second sealing inclined surface on the valve cover, and a first space, a second space and a third space are formed between the valve body, the valve cover and the wedge-shaped sealing gasket.

[0015] By adopting the above technical scheme, two inclined surfaces are respectively arranged on both sides of the wedge-shaped sealing gasket, which can reduce the contact area and the sealing stress on the one hand, and form a double sealing pair to further improve the sealing performance and effect on the other hand. After the installation is completed, the valve body and the valve cover are tightly fitted, and the wedge-shaped sealing gasket is also micro-deformed to form a close fit of the sealing inclined surface. Since the wedge-shaped sealing gasket and the valve body and the valve cover are already in close contact with the sealing inclined surfaces, they have a certain initial sealing force and sealing performance. When the pressure and temperature of the medium in the valve cavity continue to increase, the wedge-shaped sealing gasket will gradually expand to form a larger self-tightening sealing force and better sealing performance. In addition, the corresponding matching surfaces of the valve body and the valve cover are tightly fitted to form a third sealing guarantee, so that the valve body and the valve cover can be completely sealed without leakage.

[0016] The present invention is further configured as follows: the inlet valve seat assembly includes an inlet valve seat and a leaf spring, a first mounting groove is provided at the inner end of the valve body corresponding to the inlet flow channel, the leaf spring and the inlet valve seat are arranged in the first mounting groove, the sharp edge at one end of the leaf spring is tightly fitted with the inlet valve seat, and the two sharp edges at the other end of the leaf spring are tightly fitted with the inner end surface and the inner circular surface of the first mounting groove respectively, so that a sealed independent chamber is formed between the leaf spring and the inlet valve seat.

[0017] By adopting the above technical solution, a sealed independent chamber is formed between the leaf spring and the inlet valve seat, and impurities are isolated from the outside of the independent chamber, so that the independent chamber has a highly clean space and will not be blocked or stuck. At the same time, it also prevents external impurities from invading the mating surface of the inlet valve seat and the valve body from the inlet, so that the inlet valve seat can be free from impurity invasion for a long time. At the same time, since the leaf spring has corresponding elastic deformation, it can maintain effective driving of the inlet valve seat under highly changing temperature, ensuring that the inlet valve seat can maintain high performance under highly harsh working conditions.

[0018] The present invention is further configured as follows: the outlet valve seat assembly includes a fixed valve seat, a limiting pressure plate and a second screw; the valve cover is provided with a second mounting groove at a position corresponding to the inner end of the outlet flow channel; the limiting pressure plate is locked and connected to the inner end of the valve cover by a second screw; the limiting pressure plate presses the fixed valve seat in the second mounting groove; and the inner end of the fixed valve seat is provided with a first boss surface; the inner end surface of the second mounting groove is provided with a second boss surface that is tightly abutted against the first boss surface.

[0019] By adopting the above technical scheme, the installation structure of the fixed valve seat is simple and reliable, and disassembly and assembly are very convenient. At the same time, since the inner end of the fixed valve seat and the inner end of the second installation groove have a first boss surface and a second boss surface that match each other, the surfaces of the matching surfaces meet the mirror finish requirements and can fit completely tightly under the pressure of the limit pressure plate and the second screw.

[0020] The present invention is further configured such that the sealing surfaces of the ball, the inlet valve seat and the fixed valve seat are all provided with a wear-resistant layer.

[0021] By adopting the above technical solution, the wear-resistant layer can be made of materials such as T-800, CrC, etc., which have high wear resistance at high temperatures.

[0022] The present invention is further configured to include an upper sealing assembly for sealing the gap between valve stems, the upper sealing assembly including a packing pressure plate, a packing sleeve and an upper packing, the valve body corresponding to the outer end of the upper axial hole is provided with a packing cavity coaxial with the valve stem, the packing pressure plate is locked and connected to the valve body through fasteners, the packing pressure plate is pressed on the packing sleeve, so that the packing sleeve presses the upper packing in the packing cavity.

[0023] By adopting the above technical solution, the sealing between the valve body and the valve stem can be ensured, and the internal medium can be prevented from leaking from the gap between the two.

[0024] The present invention is further configured such that a position where the valve stem is arranged in the valve cavity is provided with a limit flange extending toward the outer periphery, a position of the valve body corresponding to the inner end of the upper shaft hole is provided with a limit step for limiting the upper stroke of the limit flange on the valve stem, and a friction pad is provided between the limit flange and the limit step.

[0025] By adopting the above technical solution, the valve stem is blocked when it passes through the lower shaft hole of the valve body and reaches the upper shaft hole, and is restricted in the valve cavity and cannot be sprayed out, which has a very important safety function of preventing the valve stem from blowing out. A friction pad is arranged between the limit flange and the limit step, and the surface of the friction pad is hardened and has wear-resistant performance. During the rotation of the valve stem, rotational friction occurs between the friction pads, which reduces the friction between the matching surfaces of the limit flange and the limit step, making the valve operation more reliable and having a longer service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of a specific embodiment of the present invention; Figure 2 for Figure 1 The enlarged structural diagram of the middle part I; Figure 3 for Figure 1 The enlarged structural diagram of the middle part II; Figure 4 for Figure 1 The enlarged structural diagram of the middle part III; Figure 5 for Figure 1 The enlarged structural diagram of the middle part IV; Figure 6 for Figure 1 Schematic diagram of the enlarged structure of part V in the middle.

[0027] In the figure: 1. valve body; 2. valve stem; 3. ball; 4. valve cavity; 5. inlet flow channel; 6. outlet flow channel; 7. upper shaft hole; 8. lower shaft hole; 9. inlet valve seat assembly; 10. outlet valve seat assembly; 11. bottom sealing mechanism; 12. gland; 13. plug; 14. sealing step; 15. conical surface; 16. first screw; 17. bottom packing assembly; 18. bottom packing; 19. pressure ring; 20. spring seat; 21. spring; 22. lower sealing groove; 23. floating gap; 24. positioning groove; 25. valve body; 26. valve cover; 27. wedge-shaped sealing cavity; 28. wedge-shaped sealing gasket; 29. ​​first inclined surface; 30. The second inclined plane; 31. The third inclined plane; 32. The fourth inclined plane; 33. The first sealing inclined plane; 34. The second sealing inclined plane; 35. The first space; 36. The second space; 37. The third space; 38. The inlet valve seat; 39. The leaf spring; 40. The first mounting groove; 41. The independent chamber; 42. The fixed valve seat; 43. The limiting pressure plate; 44. The second screw; 45. The second mounting groove; 46. The first boss surface; 47. The second boss surface; 48. The upper sealing assembly; 49. The packing pressure plate; 50. The packing sleeve; 51. The upper packing; 52. The packing cavity; 53. The fastener; 54. The limiting flange; 55. The limiting step; 56. The friction pad. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Example: As shown in the attached Figures 1 to 6The ultra-high-pressure, high-temperature wear-resistant ball valve shown in the figure comprises a valve body 1, a valve stem 2 and a ball 3, wherein a valve cavity 4 is arranged in the valve body 1, and an inlet flow channel 5 and an outlet flow channel 6 connected to the valve cavity 4 are respectively arranged at both ends of the valve body 1, and an upper shaft hole 7 and a lower shaft hole 8 connected to the valve cavity 4 are respectively opened at the upper and lower ends of the valve body 1, and the valve stem 2 is penetrated through the upper shaft hole 7, and the valve stem 2 is provided with large and small end sizes, and the lower end size is larger, and the inner end of the valve stem 2 is linked to the ball 3 arranged in the valve cavity 4, and the inner ends of the inlet flow channel 5 and the outlet flow channel 6 are respectively provided with inlet valves for forming a sealing fit with the ball 3 when the valve is closed. The seat assembly 9 and the outlet valve seat assembly 10 also include a bottom sealing mechanism 11, the bottom sealing mechanism 11 includes a pressure cover 12 and a plug 13, a sealing step 14 is provided in the lower shaft hole 8, and a conical surface 15 is provided on the plug 13. Generally, the angle of the conical surface 15 is 60°. The plug 13 and the pressure cover 12 are locked together by a first screw 16, so that the conical surface 15 is tightly pressed against the sealing step 14, and a related inclined surface is also provided at the corresponding position of the sealing step 14 to cooperate with it. The matching surfaces are all welded with corrosion-resistant and high-temperature resistant hard alloy as sealing surfaces. At the same time, the pressure cover 12 and the valve body 1 are tightly pressed against the position corresponding to the outer end of the lower shaft hole 8. A bottom sealing mechanism 11 is arranged on the lower shaft hole 8, and the plug 13 and the pressure cover 12 are locked together by a first screw 16, so that the conical surface 15 is tightly pressed against the sealing step 14, and at the same time, the pressure cover 12 and the valve body 1 are tightly pressed against the position of the outer end of the lower shaft hole 8, and the two are hard-sealed, no matter how the working medium temperature and working pressure change, it can be ensured that the bottom of the valve body 1 for installing the valve stem 2 is completely sealed without any leakage.

[0030] As attached Figure 1 and attached Figure 3As shown, the bottom sealing mechanism 11 also includes a bottom packing assembly 17, which includes a bottom packing 18, a pressure ring 19, a spring seat 20 and a plurality of springs 21. A lower sealing groove 22 is provided at the outer end of the lower shaft hole 8. When the pressure cover 12 is locked and connected with the plug 13, the pressure cover 12 presses the spring seat 20, the plurality of springs 21, the pressure ring 19 and the bottom packing 18 into the lower sealing groove 22 in sequence, and the inner circumferential surface of the bottom packing 18 is tightly fitted with the outer circumferential surface of the plug 13, and the outer circumferential surface of the bottom packing 18 is tightly fitted with the inner circumferential surface of the lower sealing groove 22. A floating gap 23 is provided between the spring seat 20 and the pressure ring 19. When the conical surface 15 on the plug 13 is tightly fitted and sealed with the sealing step 14 in the lower shaft hole 8, the pressure cover 12 pushes the spring seat 20 and the spring 21 to push the pressure ring 19 toward the bottom filler 18, thereby realizing the second seal for the plug 13. After the bottom sealing mechanism 11 is installed, a floating gap 23 is maintained between the upper end surface of the spring seat 20 and the pressure ring 19, which can prevent the expansion of components such as the bottom filler 18 caused by high temperature. The bottom filler 18 fits tightly with the inner end surface of the lower sealing groove 22, and the corresponding surface reaches the smoothness required for sealing, which serves as the third insurance for the bottom seal.

[0031] As attached Figure 3 As shown, a positioning groove 24 for embedding one end of the spring 21 is provided on the spring seat 20. This design can position the spring 21 and improve the stability of the installation of the spring 21.

[0032] As attached Figure 1 As shown, the valve body 1 includes a valve body 25 and a valve cover 26, the valve body 25 and the valve cover 26 are detachably connected together by bolts, the valve cavity 4 is arranged in the valve body 25, and the inlet flow channel 5 and the outlet flow channel 6 are respectively arranged on the valve body 25 and the valve cover 26. The valve body 1 is designed as a detachable structure, which is convenient for the assembly of internal parts such as the ball 3.

[0033] As attached Figure 1 and attached Figure 2As shown, after the valve body 25 and the valve cover 26 are installed, a wedge-shaped sealing cavity 27 is provided between the valve body 25 and the valve cover 26, and a wedge-shaped sealing gasket 28 is provided in the wedge-shaped sealing cavity 27. The wedge-shaped sealing gasket 28 is provided with a first inclined surface 29, a second inclined surface 30, a third inclined surface 31 and a fourth inclined surface 32. The first inclined surface 29 and the second inclined surface 30 are provided on one inclined surface of the wedge-shaped sealing gasket 28, and the third inclined surface 31 and the fourth inclined surface 32 are provided on the other inclined surface of the wedge-shaped sealing gasket 28. The valve body 25 corresponds to the wedge-shaped sealing cavity 27. A first sealing bevel 33 is provided at a position inside the valve body 25, and a second sealing bevel 34 is provided at a position inside the valve cover 26 corresponding to the wedge-shaped sealing cavity 27. The first bevel 29 and the second bevel 30 of the wedge-shaped sealing gasket 28 are tightly matched with the first sealing bevel 33 on the valve body 25, and the third bevel 31 and the fourth bevel 32 of the wedge-shaped sealing gasket 28 are tightly matched with the second sealing bevel 34 on the valve cover 26, and a first space 35, a second space 36 and a third space 37 are formed between the valve body 25, the valve cover 26 and the wedge-shaped sealing gasket 28. Two inclined surfaces are respectively arranged on both sides of the wedge-shaped sealing gasket 28, which can reduce the contact area and the sealing stress on the one hand, and form a double sealing pair to further improve the sealing performance and effect on the other hand. After the installation is completed, the valve body 25 and the valve cover 26 are tightly fitted, and the wedge-shaped sealing gasket 28 is also micro-deformed to form a close fit of the sealing inclined surfaces. Since the wedge-shaped sealing gasket 28 and the valve body 25 and the valve cover 26 are already in close contact with each other, they have a certain initial sealing force and sealing performance. When the pressure and temperature of the medium in the valve cavity continue to increase, the wedge-shaped sealing gasket 28 will gradually expand to form a larger self-tightening sealing force and better sealing performance. In addition, the corresponding matching surfaces of the valve body 25 and the valve cover 26 are tightly fitted to form a third sealing guarantee, so that the valve body 25 and the valve cover 26 can be completely sealed without leakage.

[0034] As attached Figure 1 and attached Figure 4As shown, the inlet valve seat assembly 9 includes an inlet valve seat 38 and a leaf spring 39. The valve body 25 is provided with a first mounting groove 40 at a position corresponding to the inner end of the inlet flow channel 5. The leaf spring 39 and the inlet valve seat 38 are arranged in the first mounting groove 40. The sealing surface of the inlet valve seat 38 is arranged as a large wide spherical sealing surface. The leaf spring 39 is a separate part, which is pressed from a circular steel plate. After the leaf spring 39 and the inlet valve seat 38 are installed in the valve body 25, the sharp edge at one end of the leaf spring 39 is tightly fitted with the inlet valve seat 38, and the two sharp edges at the other end of the leaf spring 39 are tightly fitted with the inner end surface and the inner circular surface of the first mounting groove 40, respectively, so that a sealed independent chamber 41 is formed between the leaf spring 39 and the inlet valve seat 38. A sealed independent chamber 41 is formed between the leaf spring 39 and the inlet valve seat 38, isolating impurities from the outside of the independent chamber 41, so that the independent chamber 41 has a highly clean space and will not be blocked or stuck. At the same time, it also prevents external impurities from invading the mating surface of the inlet valve seat 38 and the valve body 25 from the inlet, so that the inlet valve seat 38 can be free from impurity invasion for a long time. At the same time, since the leaf spring 39 has corresponding elastic deformation, it can maintain effective driving of the inlet valve seat 38 under highly changing temperature, ensuring that the inlet valve seat 38 can maintain high performance under highly harsh working conditions.

[0035] As attached Figure 1 and attached Figure 5 As shown, the outlet valve seat assembly 10 includes a fixed valve seat 42, a limiting pressure plate 43 and a second screw 44. The valve cover 26 is provided with a second mounting groove 45 at a position corresponding to the inner end of the outlet flow channel 6. The limiting pressure plate 43 is locked and connected to the inner end of the valve cover 26 by the second screw 44. The limiting pressure plate 43 presses the fixed valve seat 42 in the second mounting groove 45, and the inner end of the fixed valve seat 42 is provided with a first boss surface 46, and the inner end surface of the second mounting groove 45 is provided with a second boss surface 47 that is tightly abutted against the first boss surface 46. In addition, the sealing surface of the fixed valve seat 42 is set as a large wide spherical sealing surface. The installation structure of the fixed valve seat 42 is simple and reliable, and it is very convenient to disassemble and assemble. At the same time, since the inner end of the fixed valve seat 42 and the inner end of the second mounting groove 45 have the first boss surface 46 and the second boss surface 47 that match each other, the matching surface surfaces meet the mirror finish requirements and can be completely tightly matched under the pressure of the limiting pressure plate 43 and the second screw 44.

[0036] The sealing surfaces of the ball 3, the inlet valve seat 38 and the fixed valve seat 42 are all provided with a wear-resistant layer. The wear-resistant layer can be made of materials such as T-800, CrC, etc., which have high wear resistance at high temperatures.

[0037] As attached Figure 1As shown, the valve body 25 also includes an upper sealing assembly 48 for sealing the gap between the valve body 25 and the valve stem 2, the upper sealing assembly 48 includes a packing plate 49, a packing sleeve 50 and an upper packing 51, the valve body 25 is provided with a packing cavity 52 coaxial with the valve stem 2 at a position corresponding to the outer end of the upper shaft hole 7, the packing plate 49 is locked and connected with the valve body 25 through a fastener 53, the packing plate 49 is pressed on the packing sleeve 50, so that the packing sleeve 50 presses the upper packing 51 in the packing cavity 52; wherein the fastener 53 is a combination of a stud, a nut and a disc spring, the stud passes through the packing plate 49 and is threadedly connected to the valve body 25, the nut is threadedly connected to the stud and is tightly pressed against the upper end of the packing plate 49, and the disc spring combination is arranged between the nut and the packing plate 49. The upper sealing assembly 48 can ensure the sealing between the valve body 25 and the valve stem 2, and prevent the internal medium from leaking from the gap between the two.

[0038] As attached Figure 1 and attached Figure 6 As shown, the position of the valve stem 2 disposed in the valve cavity 4 is provided with a limiting flange 54 extending toward the periphery, and the position of the valve body 1 corresponding to the inner end of the upper shaft hole 7 is provided with a limiting step 55 for constituting an upper stroke limit for the limiting flange 54 on the valve stem 2, and a friction pad 56 is provided between the limiting flange 54 and the limiting step 55, and the friction pad 56 is composed of at least two pieces, and can also be composed of three or more pieces. The valve stem 2 is blocked when it passes through the lower shaft hole 8 of the valve body 1 and reaches the upper shaft hole 7, and is restricted in the valve cavity 4 and cannot be ejected, which has a very important safety function of preventing the valve stem 2 from blowing out, and the friction pad 56 is provided between the limiting flange 54 and the limiting step 55, and the surface of the friction pad 56 is hardened and has wear resistance. During the rotation of the valve stem 2, the friction pads 56 rotate and rub against each other, thereby reducing the friction between the matching surfaces of the limiting flange 54 and the limiting step 55, making the valve operation more reliable and having a longer service life.

[0039] According to the above technical scheme, the ball 3 installed in the middle of the valve body 1 is completely tightly fitted with the sealing surface of the fixed valve seat 42 of the outlet valve seat assembly under the push of the front end inlet valve seat assembly 9. When the valve is closed, due to the first tight fit seal between the inlet valve seat 38 and the ball 3, and the second tight fit seal between the rear end fixed valve seat 42, and at the same time, since the sealing surfaces of the inlet valve seat 38 and the outlet valve seat are both provided with a wide sealing surface that completely matches the spherical surface of the ball 3, the ball valve can achieve a highly emergency zero leakage sealing performance under ultra-high pressure.

[0040] At the same time, since the technical solution sets an anti-stuck structure of elastic live load in the valve seat cooperation, valve stem 2, ball 3 and seal cooperation of the internal moving parts, the external seals are set with double and multiple high-performance sealing structures, and in addition to the valve stem 2 and the bottom seal added with high-temperature flexible graphite non-metallic materials, its main seals, including the inlet valve seat 38, the outlet valve seat, the middle flange seal and the wear-resistant layer are all made of high-temperature resistant all-metal materials, which further ensures the long-term reliable and safe operation of the valve under ultra-high temperature and ultra-high pressure.

Claims

1. An ultra-high pressure and high temperature wear-resistant ball valve, comprising a valve body (1), a valve stem (2) and a ball (3), wherein a valve cavity (4) is arranged in the valve body (1), and an inlet flow channel (5) and an outlet flow channel (6) are respectively arranged at both ends of the valve body (1) and are communicated with the valve cavity (4), and an upper shaft hole (7) and a lower shaft hole (8) are respectively opened at the upper and lower ends of the valve body (1) and are communicated with the valve cavity (4), the valve stem (2) is inserted into the upper shaft hole (7), and the inner end of the valve stem (2) is linked to the ball (3) arranged in the valve cavity (4), and the inner ends of the inlet flow channel (5) and the outlet flow channel (6) are respectively provided with an inlet valve seat assembly (9) and an outlet valve seat assembly (10) for forming a sealing fit with the ball (3) when the valve is closed; characterized in that: The valve body (10) further comprises a bottom sealing mechanism (11), wherein the bottom sealing mechanism (11) comprises a gland (12) and a plug (13), a sealing step (14) being provided in the lower shaft hole (8), a conical surface (15) being provided on the plug (13), the plug (13) and the gland (12) being locked together by a first screw (16), so that the conical surface (15) and the sealing step (14) are tightly abutted against each other, and at the same time, the gland (12) and the valve body (1) are tightly abutted against each other at the position corresponding to the outer end of the lower shaft hole (8).

2. The ultra-high pressure and high temperature wear-resistant ball valve according to claim 1, characterized in that: The bottom sealing mechanism (11) also includes a bottom packing assembly (17), which includes a bottom packing (18), a pressure ring (19), a spring seat (20) and a plurality of springs (21). The outer end of the lower shaft hole (8) is provided with a lower sealing groove (22). When the pressure cover (12) is locked and connected with the plug (13), the pressure cover (12) presses the spring seat (20), the plurality of springs (21), the pressure ring (19) and the bottom packing (18) into the lower sealing groove (22) in sequence, and the inner circumferential surface of the bottom packing (18) is tightly fitted with the outer circumferential surface of the plug (13), and the outer circumferential surface of the bottom packing (18) is tightly fitted with the inner circumferential surface of the lower sealing groove (22). A floating gap (23) is provided between the spring seat (20) and the pressure ring (19).

3. The ultra-high pressure and high temperature wear-resistant ball valve according to claim 2, characterized in that: The spring seat (20) is provided with a positioning groove (24) for embedding one end of the spring (21).

4. The ultra-high pressure and high temperature wear-resistant ball valve according to claim 1, characterized in that: The valve body (1) comprises a valve body (25) and a valve cover (26), wherein the valve body (25) and the valve cover (26) are detachably connected together by bolts, the valve cavity (4) is arranged in the valve body (25), and the inlet flow channel (5) and the outlet flow channel (6) are respectively arranged on the valve body (25) and the valve cover (26).

5. The ultra-high pressure and high temperature wear-resistant ball valve according to claim 4, characterized in that: After the valve body (25) and the valve cover (26) are installed, a wedge-shaped sealing cavity (27) is provided between the valve body (25) and the valve cover (26), a wedge-shaped sealing gasket (28) is provided in the wedge-shaped sealing cavity (27), a first inclined surface (29), a second inclined surface (30), a third inclined surface (31) and a fourth inclined surface (32) are provided on the wedge-shaped sealing gasket (28), a first sealing inclined surface (33) is provided at a portion of the valve body (25) corresponding to the portion of the wedge-shaped sealing cavity (27), and a first sealing inclined surface (33) is provided at a portion of the valve cover (26) corresponding to the portion of the wedge-shaped sealing cavity (27). A second sealing bevel (34) is provided at a position, the first bevel (29) and the second bevel (30) of the wedge-shaped sealing gasket (28) are tightly matched with the first sealing bevel (33) on the valve body (25), the third bevel (31) and the fourth bevel (32) of the wedge-shaped sealing gasket (28) are tightly matched with the second sealing bevel (34) on the valve cover (26), and a first space (35), a second space (36) and a third space (37) are formed between the valve body (25), the valve cover (26) and the wedge-shaped sealing gasket (28).

6. The ultra-high pressure and high temperature wear-resistant ball valve according to claim 4, characterized in that: The inlet valve seat assembly (9) includes an inlet valve seat (38) and a leaf spring (39); a first mounting groove (40) is provided at a position of the inner end of the valve body (25) corresponding to the inlet flow channel (5); the leaf spring (39) and the inlet valve seat (38) are arranged in the first mounting groove (40); a sharp edge at one end of the leaf spring (39) is tightly fitted with the inlet valve seat (38); two sharp edges at the other end of the leaf spring (39) are tightly fitted with the inner end surface and the inner circular surface of the first mounting groove (40), respectively, so that a sealed independent chamber (41) is formed between the leaf spring (39) and the inlet valve seat (38).

7. The ultra-high pressure and high temperature wear-resistant ball valve according to claim 6, characterized in that: The outlet valve seat assembly (10) includes a fixed valve seat (42), a limiting pressure plate (43) and a second screw (44); the valve cover (26) is provided with a second mounting groove (45) at a position corresponding to the inner end of the outlet flow channel (6); the limiting pressure plate (43) is locked and connected to the inner end of the valve cover (26) by the second screw (44); the limiting pressure plate (43) presses the fixed valve seat (42) in the second mounting groove (45); and the inner end of the fixed valve seat (42) is provided with a first boss surface (46); the inner end surface of the second mounting groove (45) is provided with a second boss surface (47) that is tightly abutted against the first boss surface (46).

8. The ultra-high pressure and high temperature wear-resistant ball valve according to claim 7, characterized in that: The sealing surfaces of the ball (3), the inlet valve seat (38) and the fixed valve seat (42) are all provided with a wear-resistant layer.

9. The ultra-high pressure and high temperature wear-resistant ball valve according to claim 4, characterized in that: It also includes an upper sealing assembly (48) for sealing the gap between the valve body (25) and the valve stem (2), the upper sealing assembly (48) including a packing pressure plate (49), a packing sleeve (50) and an upper packing (51), the valve body (25) corresponding to the outer end of the upper shaft hole (7) is provided with a packing cavity (52) which is coaxial with the valve stem (2), the packing pressure plate (49) is locked and connected to the valve body (25) through a fastener (53), the packing pressure plate (49) is pressed on the packing sleeve (50), so that the packing sleeve (50) presses the upper packing (51) into the packing cavity (52).

10. The ultra-high pressure and high temperature wear-resistant ball valve according to claim 1, characterized in that: The valve stem (2) is provided with a limit flange (54) extending toward the periphery at a position disposed in the valve cavity (4), and the valve body (1) is provided with a limit step (55) for constituting an upper stroke limit for the limit flange (54) on the valve stem (2) at a position corresponding to the inner end of the upper shaft hole (7), and a friction pad (56) is provided between the limit flange (54) and the limit step (55).

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