High-pressure fully welded ball valve with anti-erosion rotary seat structure

Abstract

This application relates to the field of ball valves, specifically disclosing a high-pressure fully welded ball valve with an anti-erosion rotary valve seat structure. It includes a valve body, a valve seat, and a ball. A valve cavity is formed within the valve body, and the ball is rotatably disposed within the valve cavity. The application also includes a rotating mechanism, which comprises an active component mounted on the ball and multiple pins. The active component includes a paddle and an elastic element. The pins are mounted on the valve seat and are spaced apart around the valve seat axis. The valve seat is rotatably disposed within the valve cavity around its own axial direction. One end of the paddle is rotatably mounted on the ball, and the other end is movable and used to abut against any of the pins. The elastic element drives the paddle to reset. This application has the effect of reducing the production cost of ball valves with adjustable valve seat rotation.

Description

Technical Field

[0001] This application relates to the field of ball valves, and in particular to a high-pressure fully welded ball valve with an anti-erosion rotary valve seat structure. Background Technology

[0002] High-pressure fully welded ball valves are used in many applications where leakage is not permissible due to their excellent sealing performance, such as the transmission of flammable and explosive media, urban underground pipelines, direct-buried long-distance pipelines, and compressor stations.

[0003] All ball valves share a drawback during opening and closing: when the valve is nearing full closure or just opening, the narrowest point of the valve seat is subjected to high-speed erosion by the medium, making this area the most severely worn part of the valve seat and easily becoming the starting point for leakage in most ball valves. For non-fully welded ball valves, damaged valve seats can be disassembled and replaced, while fully welded ball valves do not allow for seat replacement. The service life of the valve seat directly affects the service life of the fully welded ball valve.

[0004] In related technologies, a ratchet-like structure is set on the valve seat and a pawl-like structure is set on the ball, so that the rotation of the ball can drive the rotation of the valve seat to adjust the narrow point position of the valve seat. However, the integration of the ratchet and pawl mechanism into the ball valve has a complex manufacturing process, resulting in high cost of the ball valve, and needs to be improved. Summary of the Invention

[0005] To reduce the production cost of ball valves with adjustable valve seat rotation, this application provides a high-pressure fully welded ball valve with an anti-erosion rotary valve seat structure.

[0006] This application provides a high-pressure, fully welded ball valve with an anti-erosion rotary valve seat structure, employing the following technical solution:

[0007] A high-pressure fully welded ball valve with an anti-erosion rotary valve seat structure includes a valve body, a valve seat, and a ball. A valve cavity is formed within the valve body, and the ball is rotatably disposed within the valve cavity. The valve valve also includes a rotating mechanism, which comprises an active component mounted on the ball and multiple pins. The active component includes a paddle block and an elastic element. The pins are mounted on the valve seat and are spaced apart around the valve seat axis. The valve seat is rotatably disposed within the valve cavity around its own axial direction. One end of the paddle block is rotatably mounted on the ball, and the other end of the paddle block is movable and used to abut against any of the pins. The elastic element is used to drive the paddle block to reset.

[0008] By adopting the above technical solution, the ball rotates when the ball valve is opened and closed. Taking the example of the lever driving the valve seat to rotate via the pin when the ball valve is closed, the ball rotates and drives the active component to rotate together. The lever rotates until its end extends between two adjacent pins. As the ball continues to rotate, the lever rotates until its end presses against one of the pins and drives the valve seat to rotate via the pin. The lever pushes the valve seat to rotate via the pin. Reversing the ball, the lever rotates until it contacts the next pin. As the ball continues to reverse, the lever rotates relative to the ball, compressing and storing energy in the elastic element until the lever separates from the pin. At this time, the elastic element releases energy and drives the lever to reset. By setting the orientation of the lever, the force direction of the lever when it pushes the pin to rotate can be made perpendicular to its own rotation axis. In this way, when the ball drives the pin to rotate via the lever, the lever is difficult to rotate relative to the ball. When the pin and the block collide during the ball's reversal, conventional sealing elements such as sealing rings need to be installed on the valve seat. The sealing elements provide a large frictional force, and the elastic force of the elastic element alone is insufficient to overcome the frictional force provided by the sealing elements. This allows the block to rotate while the valve seat remains stationary during the ball's reversal.

[0009] This design allows the valve seat to rotate by opening and closing the ball valve, enabling adjustment of the narrowest point of the valve seat and effectively extending its service life, thus extending the service life of the all-welded ball valve. Furthermore, in some applications, harmful deposits may accumulate on the valve seat, causing it to jam or fail to seal properly; rotating the valve seat can break down or prevent the accumulation of foreign matter.

[0010] Compared to using a ratchet and pawl structure to rotate the valve seat, the ratchet needs to be integrally molded onto the valve seat. This presents two main challenges: firstly, the manufacturing process is more complex; secondly, to ensure the ball valve's lifespan, both the ratchet and pawl must be made of wear-resistant alloy steel, which in turn requires the valve seat, also made of wear-resistant alloy steel, significantly increasing material costs. In this application, the valve seat of the ball valve can still be made of the same material as the valve body, requiring only the pin and lever to be made of wear-resistant alloy steel. The pin is inserted by drilling a hole in the valve body, simplifying the manufacturing process and greatly reducing material costs.

[0011] Optionally, a mounting groove is formed on the outer surface of the sphere, the active component is disposed in the mounting groove, the movable end of the lever can extend out of the mounting groove, and the elastic element is used to drive the movable end of the lever to return to the outside of the mounting groove.

[0012] By adopting the above technical solution, compared with setting an additional structure on the ball for mounting the active component, the active component is mounted by opening a mounting slot. Firstly, the machining on the ball is simple, and there is no need to add an extension structure on the valve seat for mounting the pin. Secondly, the structure is more compact.

[0013] Optionally, one of the groove walls of the mounting groove is a stop wall, one end of the toggle block is a limiting end, the distance between the stop wall and the rotation axis of the toggle block is less than the distance between the limiting end and the rotation axis of the toggle block, and the stop wall is located on the rotation path of the limiting end.

[0014] By adopting the above technical solution, when the ball rotates to the point where the lever block contacts the pin and drives the valve seat to rotate, the lever block rotates slightly during the contact process with the pin, and the limiting end contacts the anti-rotation wall, thus limiting the lever block's continued rotation. Compared to using an elastic element to ensure that the lever block's force direction is perpendicular to its own rotation axis each time it resets, the setting of the limiting end and the anti-rotation wall makes it easier to limit the rotation of the lever block when it applies force to the lever. Moreover, when the elastic element resets the lever block, the limiting end and the anti-rotation wall can also limit the lever block's excessive rotation, that is, ensure that the lever block resets to the same position, improving the reliability of the rotating mechanism.

[0015] Optionally, a limiting groove is provided at the end of the lever, so that the limiting groove is used for the insertion of the lever pin.

[0016] By adopting the above technical solution, compared with the direct contact between the push block and the pin, when the push block pushes the pin, the pin is inserted into the groove, which can effectively limit the relative sliding between the push block and the pin, that is, effectively ensure that the push block can continuously and stably apply force to the pin, and further improve the reliability of the rotating mechanism.

[0017] Optionally, a deformation groove is formed on the surface of the push block, and the elastic element is disposed in the deformation groove. One end of the elastic element extends out of the deformation groove and is used to abut against the ball.

[0018] By adopting the above technical solution, the deformation groove guides the elastic deformation of the elastic element, which not only expands the expansion space of the elastic element in a narrow space and improves the overall compactness of the active component, but also guides the elastic deformation of the elastic element to ensure that the elastic element applies a stable force to the lever.

[0019] Optionally, the valve seat is provided with an adjusting bearing.

[0020] By adopting the above technical solution, compared with the valve seat rotating directly in the valve cavity, the adjusting bearing can reduce the main friction force of the valve seat during rotation, which helps the lever to drive the valve seat to rotate through the lever pin.

[0021] Optionally, the adjusting bearing includes a first bearing seat, a second bearing seat, a steel ball disposed between the first bearing seat and the second bearing seat, and a disc spring disposed between the second bearing seat and the valve body. The first bearing seat is disposed on the valve seat, the disc spring abuts against both the second bearing seat and the valve body, and the disc spring applies a force to the second bearing seat in the direction of the first bearing seat.

[0022] By adopting the above technical solution, under the action of the disc spring, the second bearing seat is fixed relative to the valve body, while the first bearing seat can rotate relative to the second bearing seat. Compared to the valve seats rotating within the valve cavity and rubbing against the valve body, this arrangement effectively reduces the rotational friction of the valve seats. The disc spring applies force to the second bearing seat, allowing the second and first bearing seats to clamp the steel ball, thus ensuring that the adjusting bearing remains integrated for easy installation.

[0023] Optionally, the valve seat is slidably disposed in the valve cavity along its own axial direction, and the disc spring applies a force toward the ball to the second bearing seat.

[0024] By adopting the above technical solution, the valve seat, which is slidably installed in the valve cavity, is pressed tightly against the ball by the force applied by the disc spring, generating an initial sealing pressure, thereby ensuring sealing performance at low pressure. At high pressure, the pipeline pressure acts on the valve seat, strengthening the ball-holding seal of the valve seat, and the higher the pressure, the better the sealing performance.

[0025] Optionally, the valve body is provided with a pressure relief valve, and the valve seat is provided with a pressure relief channel, which connects the valve cavity and the pressure relief valve.

[0026] By adopting the above technical solution, the pressure relief channel and pressure relief valve enable the ball valve of this application to have a self-relieving function, that is, the pressure in the valve cavity is automatically released, which can effectively avoid dangerous pressure increases. When the pressure in the valve cavity exceeds the downstream pressure, it will push the ball of the upstream valve seat to release the pressure, thereby improving the safety and service life of the ball valve of this application.

[0027] Optionally, it also includes a valve stem rotatably mounted on the valve body, wherein a sliding bearing is provided on the valve stem.

[0028] By adopting the above technical solution, the valve stem supported by the sliding bearing can absorb the thrust generated by the pipeline pressure and prevent the friction between the ball and the valve seat from increasing. Therefore, even under full differential pressure, the operating torque remains very low.

[0029] In summary, this application includes at least one of the following beneficial technical effects:

[0030] Replacing the ratchet and pawl with a rotating mechanism can achieve valve seat rotation adjustment in the same way, extending valve seat life and thus extending the service life of the all-welded ball valve. On the other hand, the production process and material cost of the rotating mechanism are much lower than those of the ratchet and pawl structure, thereby effectively reducing the production cost of the ball valve of this application.

[0031] The anti-rotation wall, the limiting block, and the limiting groove can effectively ensure the position of the push block and the relative position of the push block and the push pin, so that the push block can stably push the push pin and improve the reliability of the rotating mechanism.

[0032] A soft seal is achieved through a disc spring and a sliding valve seat. The higher the pressure, the better the seal, effectively ensuring the sealing performance. Combined with a pressure relief channel and a pressure relief valve, self-release is achieved, ensuring safety. Attached Figure Description

[0033] Figure 1 This is a structural schematic diagram of an embodiment of this application.

[0034] Figure 2 This is a cross-sectional view of an embodiment of this application.

[0035] Figure 3 yes Figure 2 Enlarged diagram of point A in the middle.

[0036] Figure 4 This is a schematic diagram showing the structure of the valve seat in an embodiment of this application.

[0037] Figure 5 This is a schematic diagram of the structure highlighting the active component in the embodiments of this application.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. Valve body; 11. Valve cavity; 12. Pressure relief valve; 2. Ball; 21. Mounting groove; 211. Anti-rotation wall; 3. Valve stem; 31. Sliding bearing; 4. Valve seat; 41. Valve seat ring; 42. Valve seat support ring; 421. Pressure relief channel; 43. Inner sealing ring; 44. Outer sealing ring; 45. Adjusting bearing; 451. First bearing seat; 452. Second bearing seat; 453. Steel ball; 454. Disc spring; 46. Limiting pin; 5. Rotating mechanism; 51. Active component; 511. Stud pin; 512. Nut; 513. Pulley; 514. Elastic element; 515. Deformation groove; 516. Limiting groove; 517. Limiting end; 518. Reset surface; 52. Pulley. Detailed Implementation

[0040] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0041] This application discloses a high-pressure fully welded ball valve with an anti-erosion rotary valve seat structure. (Refer to...) Figure 1 , Figure 2 The high-pressure fully welded ball valve with an anti-erosion rotary valve seat structure includes a valve body 1, a ball 2, and a valve stem 3. A valve cavity 11 is formed inside the valve body 1, and the ball 2 is rotatably disposed in the valve cavity 11.

[0042] Reference Figure 2 The valve stem 3 is fixed to the ball 2, and one end of the valve stem 3 extends outside the valve body 1. Rotating the valve stem 3 can drive the ball 2 to rotate. A sliding bearing 31 is sleeved and fixed on the valve stem 3, which can reduce the friction force on the valve stem 3 when it rotates.

[0043] Reference Figure 2 , Figure 3 Two sets of valve seats 4 are provided in the valve cavity 11. The valve seats 4 are slidably disposed in the valve cavity 11 along their own axial direction, that is, the valve seats 4 are slidably disposed in the valve cavity 11 along the flow direction of the fluid. The valve seat 4 includes a valve seat ring 41 and a valve seat support ring 42. The valve seat ring 41 is located on the side of the valve seat support ring 42 closer to the valve stem 3.

[0044] Reference Figure 3 An inner sealing ring 43 is provided between the valve seat ring 41 and the valve seat support ring 42, and one end of the inner sealing ring 43 abuts against the ball 2. Three outer sealing rings 44 are fitted on the valve seat 4 to abut against the cavity wall of the valve cavity 11, one of which is fitted on the valve seat ring 41, and the other two are fitted on the valve seat support ring 42.

[0045] Reference Figure 3 The valve seat ring 41 is provided with an adjusting bearing 45, which includes a first bearing seat 451, a second bearing seat 452, a plurality of steel balls 453 disposed between the first bearing seat 451 and the second bearing seat 452, and a disc spring 454 disposed between the second bearing seat 452 and the valve body 1.

[0046] Reference Figure 3 The first bearing housing 451 is fixed to the valve seat ring 41 by multiple bolts. One end of the valve seat support ring 42 extends between the valve seat ring 41 and the first bearing housing 451. The valve seat support ring 42 and the valve seat ring 41 clamp the inner sealing ring 43. The inner sealing ring 43 deforms and abuts against the valve seat support ring 42 and the valve seat ring 41, and also makes the valve seat support ring 42 abut against the first bearing housing 451. This restricts the relative movement between the valve seat ring 41 and the valve seat support ring 42. Multiple limiting pins 46 are inserted between the valve seat ring 41 and the valve seat support ring 42. The valve seat ring 41 and the valve seat support ring 42 form multiple holes for the limiting pins 46 to be inserted. By inserting the limiting pins 46 into the corresponding holes, the relative rotation between the valve seat ring 41 and the valve seat support ring 42 can be restricted.

[0047] Reference Figure 3 , Figure 4 The disc spring 454 is located on the side of the second bearing seat 452 away from the first bearing seat 451. The two ends of the disc spring 454 abut against the second bearing seat 452 and the valve body 1 respectively, so as to apply a force to the second bearing seat 452 in the direction of the first bearing seat 451, thereby clamping the steel ball 453 between the second bearing seat 452 and the first bearing seat 451, and applying a force to the valve seat ring 41 and the valve seat support ring 42 through the first bearing seat 451, thereby causing the inner sealing ring 43 to abut against the ball 2.

[0048] Reference Figure 3The valve body 1 is equipped with a pressure relief valve 12 corresponding to the number of valve seats 4. A pressure relief channel 421 is provided on the valve seat support ring 42, which passes through the valve seat support ring 42. The pressure relief channel 421 connects the valve cavity 11 space between the ball 2 and the valve seat support ring 42 with the adjacent pressure relief valve 12.

[0049] Reference Figure 2 , Figure 4 The valve chamber 11 is also provided with a rotating mechanism 5 corresponding to the number of valve seats 4. Each rotating mechanism 5 is used to drive different valve seats 4 to rotate.

[0050] Reference Figure 4 , Figure 5 The rotating mechanism 5 includes an active component 51 and a plurality of pins 52. The pins 52 are fixed on the surface of the valve seat ring 41 near the valve stem 3, and the pins 52 are evenly distributed circumferentially around the axis of the valve seat ring 41. In this embodiment, the number of pins 52 is 24, that is, the angle formed by adjacent pins 52 and the axis of the valve seat ring 41 is 15 degrees.

[0051] Reference Figure 4 , Figure 5 The active component 51 can rotate the ball 2 to push the pin 52 to rotate, thereby rotating the valve seat 4. The outer surface of the ball 2 has mounting slots 21 corresponding to the number of active components 51. The two mounting slots 21 are evenly distributed circumferentially around the rotation axis of the ball 2, and each active component 51 is respectively set in a different mounting slot 21.

[0052] Reference Figure 4 , Figure 5 The active component 51 includes a stud pin 511, a nut 512, a lever 513, and an elastic element 514. The stud pin 511 passes through one end of the lever 513 and is threaded onto the ball 2. The nut 512 is threaded onto the stud pin 511. The lever 513 is limited within the mounting groove 21 by the groove wall of the mounting groove 21 and the nut 512. One end of the lever 513 is rotatably mounted on the stud pin 511, and the other end of the lever 513 is movable and can rotate until its movable end extends out of the mounting groove 21. The movable end of the lever 513 is used to abut against any of the lever pins 52 in the same rotating mechanism 5.

[0053] Reference Figure 5A deformation groove 515 is formed on the surface of the lever 513, and an elastic element 514 is disposed within the deformation groove 515. In this embodiment, the elastic element 514 is a spring sheet, one end of which is fixed to the lever 513 by a bolt, and the other end of which extends out of the deformation groove 515 and abuts against the wall of the mounting groove 21. When compressed, the elastic element 514 can retract back into the deformation groove 515. In other embodiments, the elastic element 514 can also be a spring or the like, as long as it can drive the movable end of the lever 513 to return to the outside of the mounting groove 21.

[0054] Reference Figure 4 , Figure 5 A limiting groove 516 is provided on the movable end of the lever 513 for the insertion of the lever pin 52. The end of the lever 513 away from its movable end is a limiting end 517, and the lever 513 can rotate until the limiting end 517 abuts against one of the groove walls of the mounting groove 21. The groove wall in the mounting groove 21 that abuts against the limiting end 517 is a rotation wall 211. The distance between the rotation wall 211 and the rotation axis of the lever 513 is less than the distance between the rotation axis of the limiting end 517 and the lever 513, and the rotation wall 211 is located on the rotation path of the limiting end 517. When the limiting end 517 abuts against the rotation wall 211, the movable end of the lever 513 is outside the mounting groove 21.

[0055] Reference Figure 4 , Figure 5 When the lever 513 is not in contact with the pin 52, under the action of the elastic element 514, the retaining end 517 of the lever 513 is pressed against the anti-rotation wall 211 to keep the end of the lever 513 extending out of the mounting groove 21. The surface facing the adjacent valve seat 4 between the movable end and the retaining end 517 of the lever 513 is the reset surface 518, which is used to abut against the pin 52.

[0056] The implementation principle of the all-welded ball valve with an anti-erosion rotary valve seat 4 structure in this application embodiment is as follows: When the ball valve is closed, the valve stem 3 drives the ball 2 to rotate, and the ball 2 drives the two sets of active components 51 to rotate. The lever 513 rotates between two adjacent lever pins 52 on the inner valve body 1. As the ball 2 continues to rotate, one of the lever pins 52 inserts into the limiting groove 516 and abuts against the lever 513. The lever 513 drives the valve seat 4 to rotate through the lever pin 52. The limiting end 517 and the anti-rotation wall 211 restrict the rotation of the lever 513 relative to the ball 2.

[0057] When the ball valve of this application is opened, the reset surface 518 presses against the pin 52, and the lever 513 rotates until its movable end retracts into the mounting groove 21, compressing the elastic element 514. Under the action of each outer sealing ring 44, the valve seat 4 will not rotate due to the rotation of the lever 513 and the force applied to the lever 513 by the elastic element 514. As the ball 2 rotates until the lever 513 separates from the pin 52, under the action of the elastic element 514, the lever 513 rotates again until the limit end 517 abuts against the anti-rotation wall 211, and the movable end of the lever 513 extends out of the mounting groove 21.

[0058] As the valve is continuously opened and closed, the valve seat 4 can be rotated and adjusted, thereby adjusting the sealing surfaces of different parts of the valve seat 4 to the narrow point, so that the wear of the narrow point is evenly distributed across the entire sealing surface.

[0059] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-pressure fully welded ball valve with an anti-erosion rotary valve seat structure, comprising a valve body (1), a valve seat (4), and a ball (2), wherein a valve cavity (11) is formed within the valve body (1), and the ball (2) is rotatably disposed within the valve cavity (11), characterized in that: It also includes a rotating mechanism (5), which includes an active component (51) and a plurality of pins (52) disposed on the ball (2). The active component (51) includes a paddle (513) and an elastic element (514). The pins (52) are disposed on the valve seat (4) and each pin (52) is arranged at intervals around the axis of the valve seat (4). The valve seat (4) is rotatably disposed in the valve cavity (11) around its own axis. One end of the paddle (513) is rotatably disposed on the ball (2). The other end of the paddle (513) is movable and used to abut against any pin (52). The elastic element (514) is used to drive the paddle (513) to reset. The outer surface of the sphere (2) is provided with a mounting groove (21), the active component (51) is disposed in the mounting groove (21), the movable end of the toggle block (513) can extend out of the mounting groove (21), and the elastic element (514) is used to drive the movable end of the toggle block (513) to return to the outside of the mounting groove (21). One of the groove walls of the mounting groove (21) is a stop wall (211), one end of the lever (513) is a limiting end (517), the distance between the rotation axis of the stop wall (211) and the lever (513) is less than the distance between the rotation axis of the limiting end (517) and the lever (513), and the stop wall (211) is located on the rotation path of the limiting end (517). An adjusting bearing (45) is provided on the valve seat (4); The adjusting bearing (45) includes a first bearing seat (451), a second bearing seat (452), a steel ball (453) disposed between the first bearing seat (451) and the second bearing seat (452), and a disc spring (454) disposed between the second bearing seat (452) and the valve body (1). The first bearing seat (451) is disposed on the valve seat (4). The disc spring (454) abuts against both the second bearing seat (452) and the valve body (1), and the disc spring (454) applies a force to the second bearing seat (452) in the direction of the first bearing seat (451). The valve seat (4) includes a valve seat ring (41) and a valve seat support ring (42). An inner sealing ring (43) is provided between the valve seat ring (41) and the valve seat support ring (42). A first bearing seat (451) is fixed to the valve seat ring (41) by multiple bolts. One end of the valve seat support ring (42) extends between the valve seat ring (41) and the first bearing seat (451). The valve seat support ring (42) and the valve seat ring (41) clamp the inner sealing ring (43). The inner sealing ring (43) deforms and abuts against the valve seat support ring (42) and the valve seat ring. (41) and make the valve seat support ring (42) press against the first bearing seat (451), so as to restrict the relative movement between the valve seat ring (41) and the valve seat support ring (42); multiple limiting pins (46) are inserted between the valve seat ring (41) and the valve seat support ring (42), and multiple holes for the limiting pins (46) are formed between the valve seat ring (41) and the valve seat support ring (42). By inserting the limiting pins (46) into the corresponding holes, the relative rotation between the valve seat ring (41) and the valve seat support ring (42) can be restricted.

2. The high-pressure fully welded ball valve with an anti-erosion rotary valve seat structure according to claim 1, characterized in that: The end of the lever (513) is provided with a limiting groove (516), so the limiting groove (516) is used for the insertion of the lever (52).

3. The high-pressure fully welded ball valve with an anti-erosion rotary valve seat structure according to claim 1, characterized in that: The surface of the push block (513) is provided with a deformation groove (515), and the elastic element (514) is disposed in the deformation groove (515). One end of the elastic element (514) extends out of the deformation groove (515) and is used to abut against the ball (2).

4. The high-pressure fully welded ball valve with an anti-erosion rotary valve seat structure according to claim 1, characterized in that: The valve seat (4) is slidably disposed in the valve cavity (11) along its own axial direction, and the disc spring (454) applies a force to the second bearing seat (452) in the direction of the ball (2).

5. The high-pressure fully welded ball valve with an anti-erosion rotary valve seat structure according to claim 4, characterized in that: The valve body (1) is provided with a pressure relief valve (12), and the valve seat (4) is provided with a pressure relief channel (421), which connects the valve cavity (11) and the pressure relief valve (12).

6. The high-pressure fully welded ball valve with an anti-erosion rotary valve seat structure according to claim 1, characterized in that: It also includes a valve stem (3) rotatably mounted on the valve body (1), and a sliding bearing (31) is provided on the valve stem (3).

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