High-pressure ball valve

Abstract

The invention relates to the technical field of high-pressure valves, in particular to a high-pressure ball valve. The high-pressure ball valve comprises a valve body, a packing box, sealing packing, a pressing ring, a valve ball, a valve seat and an elastic piece. The valve body is provided with an installation opening and a valve cavity, the stuffing box is matched with a positioning groove of the valve body through a positioning face, and sealing performance is ensured. The sealing filler is in a conical ring shape and is fixed and compressed by the compression ring, so that the valve rod is effectively sealed; the valve ball is provided with a non-coaxial pressure relief hole, so that the safety is improved; the valve seat is embedded in the valve cavity in a sliding mode and keeps making close contact with the valve ball through the elastic piece, and the sealing performance is enhanced. Meanwhile, the valve ball is further provided with a pressure relief hole, pressure is relieved in advance in the opening process, and deformation of a ball opening of the valve ball is avoided; when the ball valve is opened, pressure inside and outside the valve ball is balanced, and deformation of the valve ball is avoided. According to the high-pressure ball valve, the technical effect of improving the sealing performance and safety of the high-pressure ball valve is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of high-pressure valves, and in particular to a high-pressure ball valve. Background Art

[0002] High-pressure ball valves play a vital role in oil and gas extraction and transportation systems, especially under high-pressure environments. Due to their advantages of rapid opening and closing and high pressure resistance, these valves have gradually replaced traditional gate valves and stop valves in many special working conditions and have been widely used. However, with the continuous expansion of application scenarios and the improvement of technical requirements, the design of high-pressure ball valves faces more complex challenges.

[0003] In order to cope with these challenges, various solutions have been proposed in the prior art. For example, one common method is to set multiple sealing rings on the ball to enhance its sealing performance; another method is to improve the pressure resistance and durability of the ball by optimizing the material selection and manufacturing process of the ball; in addition, there is also the improvement of the valve structure design, such as adjusting the position and shape of the valve seat, to improve the working performance of the valve. Although these methods can solve the problem to a certain extent, they still have shortcomings in certain situations.

[0004] Although the above methods can improve the reliability and service life of high-pressure ball valves to a certain extent, they do not completely solve the reliability problem of the connection between the stuffing box and the valve body. In particular, when the valve is opened or closed, the torque will be transmitted to the stuffing box, causing the stuffing box to rotate due to the torque, thereby affecting the sealing effect between the stuffing box and the valve body, and may cause the risk of bolt breakage. Summary of the invention

[0005] In order to improve the reliability of the connection between the stuffing box and the valve body, the present application provides a high-pressure ball valve.

[0006] The high-pressure ball valve provided in this application adopts the following technical solution: A high-pressure ball valve comprises a valve body and a stuffing box. The valve body is provided with an installation opening, and the installation opening is used for the valve stem to be rotatably inserted. The stuffing box is provided with a mounting hole, the stuffing box is used to be sleeved outside the valve stem, and the mounting hole is used to communicate with the mounting port. The outer surface of the valve body is provided with a positioning groove. A positioning surface is provided on the outer surface of the stuffing box, and the positioning surface is used to fit to the groove wall of the positioning groove. At least two points on the positioning surface have different distances from the axis of the mounting hole.

[0007] By adopting the above technical solution, the connection structure between the valve body and the stuffing box is made more reliable.

[0008] Specifically, when the valve is opened or closed, the torque of the valve will be transmitted from the actuator to the stuffing box. When designing a ball valve, cylindrical pins are usually used to position the stuffing box and the valve body to prevent the stuffing box from rotating. However, due to the limitation of the design space, the cylindrical pin cannot be designed to be too large, so in actual working conditions, the cylindrical pin often breaks during the valve opening and closing process. In serious cases, when the cylindrical pin breaks and loses its limiting function, the bolt is directly sheared and breaks, resulting in the serious consequence of the valve stem flying out.

[0009] In the technical solution of the present application, the positioning groove on the outer surface of the valve body cooperates with the positioning surface on the outer surface of the stuffing box to ensure that the stuffing box will not rotate when subjected to torque, thus avoiding the problem of easy breakage of traditional cylindrical pins. At the same time, this design also prevents the risk of seal failure caused by the rotation of the stuffing box and the risk of bolts breaking due to shear force, thereby improving the overall safety and service life of the valve.

[0010] Preferably, it also includes a sealing filler, The sealing filler is in a cone ring shape and is used for sealing between the outer peripheral surface of the valve stem and the inner peripheral surface of the mounting hole.

[0011] By adopting the above technical solution, the valve stem seal adopts a conical ring-shaped sealing packing, which can deform when subjected to pressure, so that the inner side of the sealing packing fits more closely to the outer peripheral surface of the valve stem, and the outer side of the sealing packing fits more closely to the inner peripheral surface of the stuffing box. Even if the sealing packing is worn due to frequent switching of the valve stem, the sealing packing can still maintain effective sealing of the valve stem under the action of pressure, thereby realizing the automatic compensation function of the sealing packing and effectively preventing the leakage of the valve stem caused by the wear of the sealing packing.

[0012] Preferably, it also includes a pressure ring, The small diameter end of the sealing packing faces the inside of the valve body. The pressure ring is connected to the stuffing box, and is used to be sleeved outside the valve stem, and is used to abut against the large diameter end of the sealing stuffing.

[0013] By adopting the above technical solution, the compression ring can effectively fix and compress the sealing packing, ensuring that the sealing packing forms a reliable seal between the outer circumference of the valve stem and the inner circumference of the mounting hole. The compression ring is used to apply pressure to the sealing packing. The conical design of the sealing packing enables it to better fit the valve stem and the stuffing box under pressure, realize self-compensation function, and prevent leakage caused by wear. In addition, the design of the compression ring is also convenient for maintenance and replacement of the sealing packing, which improves the service life and reliability of the high-pressure ball valve.

[0014] Preferably, the bolt passes through the compression ring and is threadedly connected to the stuffing box. The pressure ring is used for extruding the sealing filler.

[0015] By adopting the above technical solution, the bolt passes through the compression ring and is threadedly connected to the stuffing box, ensuring that the compression ring can be firmly fixed on the stuffing box. At the same time, the compression ring can effectively squeeze the sealing packing, making it fit tightly against the valve stem and the inner wall of the stuffing box, improving the sealing performance and preventing leakage caused by packing wear.

[0016] Preferably, the pressure ring comprises a ring plate and a sleeve. The bolts pass through the ring plate and are threadedly connected to the stuffing box. One end of the sleeve is used to extrude the sealing filler. The other end of the sleeve is set as a spherical surface, and the ring plate is fitted on the spherical surface.

[0017] By adopting the above technical solution, the special structural design of the pressure ring can ensure the effective compression and self-adjustment of the sealing packing. Specifically: the spherical design allows a certain range of motion between the ring plate and the sleeve, which helps to have a slight offset between the ring plate and the sleeve during the process of tightening the bolts to compress the sealing packing, and can also maintain the compression of the sealing packing, and can continuously provide a stable pre-tightening force during the opening and closing process of the valve, prevent leakage caused by packing wear, and improve the reliability and safety of the valve.

[0018] Preferably, it also includes a valve ball, The valve body is provided with a valve cavity, and the valve ball is located in the valve cavity. The valve ball is provided with a flow channel, and a pressure relief hole is provided on the inner circumference of the flow channel, and the pressure relief hole penetrates to the outer surface of the valve ball. The connecting line L between the center A of the opening of the pressure relief hole on the outer surface of the valve ball and the center O of the valve ball is The connecting line L and the axis of the flow channel do not coincide with each other.

[0019] By adopting the above technical solution, the valve ball is one of the key components of the ball valve. If the ball valve is deformed due to the fluid pressure, the valve will leak. In particular, for the valve ball of the high-pressure ball valve, the pressure-bearing wall thickness of the valve ball will become thinner and thinner (determined by the formation of the valve ball) during the process from the fully closed state of the valve to the gradually opened state of the valve. When the valve seat sealing surface reaches the ball mouth but has not yet separated from the ball mouth, the valve is still in the closed state. At this time, the ball mouth of the valve ball is very easy to deform due to the increasingly thin pressure-bearing wall thickness, thereby causing the valve seal to leak due to the deformation of the valve ball. At the same time, when the valve is in the fully open state, the valve ball is equivalent to a pressure vessel with uneven wall thickness. The valve ball of the high-pressure ball valve is now subjected to the huge liquid pressure in the pipeline. The valve ball will be deformed or there is a huge risk of deformation due to the huge liquid pressure.

[0020] In the technical solution of the present application, when the ball valve is in the closed state, the pressure relief hole is outside the sealing area, so it will not affect the seal. When the ball valve is in the process of gradually opening the valve from the fully closed state, the pressure relief hole will pass over the valve seat sealing surface before the valve seat sealing surface reaches the ball mouth to produce pressure relief in advance, thereby avoiding the risk of deformation of the ball mouth due to high pressure on the valve ball and protecting the valve ball. At the same time, when the valve is in the fully open state, the pressure will be transmitted to the outside of the valve ball through the pressure relief hole, so that the entire valve ball is surrounded by pressure, so that no matter how high the pressure is, the valve ball is always in a pressure balance state and will not be deformed.

[0021] Preferably, a vertical plane S coincident with the spherical center O and perpendicular to the axis of the flow channel, The distance between the vertical plane S and the center A is greater than the radius of the flow channel.

[0022] By adopting the above technical solution, when the ball valve is in the closed state, the pressure relief hole is located outside the sealing area to avoid affecting the sealing.

[0023] Preferably, it also includes a valve seat and an elastic member, The valve seat is cylindrical or annular, and is slidably embedded in the valve cavity. The outer peripheral surface of the valve seat is used for sliding sealing with the valve body, and the valve seat is used to fit to the valve ball. The elastic member is connected between the valve seat and the valve body, and the elastic member enables the valve seat to have a tendency to approach the spherical center O.

[0024] By adopting the above technical solution, the valve seat can always maintain good contact with the valve ball.

[0025] In addition, the torque of the valve is not only related to the diameter of the valve, but also closely related to the pressure of the valve. The higher the pressure, the greater the torque. In particular, some valves in key positions need to be equipped with gas-liquid actuators for emergency shut-off. If the valve torque is too large, the valve must be matched with a gas-liquid actuator with a large torque. This means that the greater the valve torque, the more expensive the overall price of the valve equipped with the gas-liquid actuator, which often results in the price of the gas-liquid actuator being much higher than the price of the valve itself. Therefore, if the operating torque of the valve can be reduced, the gas-liquid actuator can be equipped with a smaller operating torque specification, and the overall cost of the entire gas-liquid ball valve will be greatly reduced.

[0026] In the technical solution of the present application, when the valve is in a fully open state, the force exerted by the valve seat on the ball comes from the medium pressure F1 generated by the fluid pressure of the medium on the valve seat, the low-pressure sealing pre-tightening force Fs generated by the elastic member on the valve seat, and the reverse thrust F2 of the medium on the valve seat generated by the pressure inlet of the pressure relief hole, that is, F=F1+Fs-F2, so that the torque of the valve of the present application when it is closed will be greatly reduced, and then a gas-liquid linkage actuator with relatively small torque can be selected, thereby greatly reducing the cost.

[0027] Preferably, a through hole is provided on the outer peripheral surface of the valve seat, and the other end of the through hole is connected to the valve cavity.

[0028] By adopting the above technical solution, a through hole is provided on the outer peripheral surface of the valve seat, and the other end of the through hole is connected to the valve cavity, so that the pressure in the contact area between the valve seat and the valve ball can be released in time during the valve opening process, reducing the impact of the high-pressure medium on the valve seat, and improving the service life and sealing performance of the valve seat. At the same time, the design of the through hole helps to maintain the pressure balance between the valve seat and the valve body, prevents the valve seat from being deformed due to excessive local pressure, and further enhances the reliability and stability of the valve.

[0029] In summary, the present application includes at least one of the following beneficial technical effects: 1. The positioning groove on the outer surface of the valve body cooperates with the positioning surface on the outer surface of the stuffing box to ensure that the stuffing box will not rotate when subjected to torque, thus avoiding the problem of easy breakage of traditional cylindrical pins. At the same time, this design also prevents the risk of seal failure caused by the rotation of the stuffing box and the risk of bolts breaking due to shear force, thus improving the overall safety and service life of the valve. 2. The valve stem seal adopts a conical ring-shaped sealing packing, which can deform when subjected to pressure, so that the inner side of the sealing packing fits more closely to the outer peripheral surface of the valve stem, and the outer side of the sealing packing fits more closely to the inner peripheral surface of the stuffing box; even if the sealing packing is worn due to frequent switching of the valve stem, the sealing packing can still maintain effective sealing of the valve stem under the action of pressure, thereby realizing the automatic compensation function of the sealing packing and effectively preventing the leakage of the valve stem caused by the wear of the sealing packing; 3. When the ball valve is closed, the pressure relief hole is outside the sealing area, so it will not affect the sealing; when the ball valve is gradually opened from the fully closed state, the pressure relief hole will pass the valve seat sealing surface before the valve seat sealing surface reaches the ball mouth to release pressure in advance, thereby avoiding the risk of deformation of the ball mouth due to high pressure and protecting the valve ball; at the same time, when the valve is in the fully open state, the pressure will be transmitted to the outside of the valve ball through the pressure relief hole, so that the entire valve ball is surrounded by pressure, so that no matter how high the pressure is, the valve ball is always in a pressure balance state and will not be deformed; 4. When the valve is in the fully open state, the force exerted by the valve seat on the ball comes from the medium pressure F1 generated by the fluid pressure of the medium, the low-pressure sealing preload Fs generated by the elastic member, and the reverse thrust F2 of the medium on the valve seat generated by the pressure inlet of the pressure relief hole, that is, F=F1+Fs-F2, so that the torque of the valve of this application when closed will be greatly reduced, and then a gas-liquid linkage actuator with relatively small torque can be selected, thereby greatly reducing the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of a high pressure ball valve.

[0031] Figure 2 It is a schematic diagram of a high-pressure ball valve cut along the valve stem axis.

[0032] Figure 3 It is a schematic diagram of the cooperation between the pressure ring and the valve stem.

[0033] Figure 4 It is a schematic diagram of the valve body and valve ball.

[0034] Figure 5 It is a schematic diagram of the matching of the valve seat and valve ball.

[0035] Figure 6 It is a schematic diagram of Example 2.

[0036] Explanation of the reference numerals in the accompanying drawings: 1. valve body; 11. valve cavity; 12. mounting port; 13. positioning groove; 14. embedded hole; 2. stuffing box; 21. mounting hole; 22. positioning surface; 23. mounting groove; 3. sealing packing; 4. pressing ring; 41. ring plate; 42. sleeve; 5. valve ball; 51. flow channel; 52. pressure relief hole; 6. valve seat; 61. ring seat; 611. embedded groove; 612. clamping groove; 613. ring groove; 614. sealing groove; 62. matching ring; 63. sealing ring; 64. through hole; 7. elastic member; 8. magnet; 9. piston. DETAILED DESCRIPTION

[0037] The present application is further described in detail below in conjunction with the accompanying drawings.

[0038] The embodiment of the present application discloses a high-pressure ball valve.

[0039] Example 1 Reference Figure 1 The high-pressure ball valve includes a valve body 1 and a stuffing box 2.

[0040] Reference Figure 1 and Figure 2 The valve body 1 is provided with a valve cavity 11 and an installation opening 12 which are connected to each other. The installation opening 12 penetrates the outer surface of the valve body 1, and the installation opening 12 is used for the valve stem to be rotatably embedded.

[0041] The stuffing box 2 is provided with a mounting hole 21. The stuffing box 2 is used to be sleeved outside the valve stem, and the mounting hole 21 is used to communicate with the mounting port 12.

[0042] A positioning groove 13 is provided on the outer surface of the valve body 1 , and the positioning groove 13 is connected to the installation opening 12 .

[0043] A positioning surface 22 is provided on the outer surface of the stuffing box 2 . The positioning surface 22 is used to fit to the groove wall of the positioning groove 13 . There are at least two points on the positioning surface 22 with different distances to the axis of the mounting hole 21 .

[0044] In the drawings of this embodiment: the positioning groove 13 penetrates the valve body 1 in a direction perpendicular to the axis of the installation opening 12; The positioning surface 22 is a plane, and the positioning surface 22 is parallel to the axis of the mounting hole 21 ; there are two positioning surfaces 22 , and the two positioning surfaces 22 are parallel to each other and symmetrical about the axis of the mounting hole 21 .

[0045] Reference Figure 2 and Figure 3 The inner periphery of the mounting hole 21 is coaxially provided with a mounting groove 23, and a sealing packing 3 is embedded in the mounting groove 23. The sealing packing 3 is used for sealing between the outer peripheral surface of the valve stem and the inner peripheral surface of the stuffing box 2.

[0046] The sealing packing 3 is in a cone ring shape and is used to be sleeved outside the valve stem. Meanwhile, the small diameter end of the sealing packing 3 faces the inside of the valve body 1.

[0047] The mounting groove 23 penetrates the stuffing box 2 in a direction away from the interior of the valve body 1 .

[0048] The high-pressure ball valve further comprises a pressing ring 4 , which is used to be sleeved outside the valve stem and to squeeze the large-diameter end of the sealing packing 3 .

[0049] The pressure ring 4 comprises a ring plate 41 and a sleeve 42. The ring plate 41 and the sleeve 42 are both used to be sleeved outside the valve stem.

[0050] The outer diameter of the ring plate 41 is larger than the diameter of the mounting groove 23. The bolt passes through the ring plate 41 and is threadedly connected to the stuffing box 2. One end of the sleeve 42 is coaxially embedded in the mounting groove 23, so that one end of the sleeve 42 is used to squeeze the sealing packing 3.

[0051] The other end of the sleeve 42 is configured as a spherical surface, and the ring plate 41 is fitted onto the spherical surface.

[0052] Reference Figure 4 The high pressure ball valve further comprises a valve ball 5. The valve ball 5 is rotatably embedded in the valve cavity 11.

[0053] The valve ball 5 is provided with a flow channel 51 . A pressure relief hole 52 is provided at the inner circumference of the flow channel 51 , and the pressure relief hole 52 penetrates to the outer surface of the valve ball 5 .

[0054] The line L between the center A of the opening of the pressure relief hole 52 on the outer surface of the valve ball 5 and the center O of the valve ball 5 does not coincide with the line L and the axis of the flow channel 51. The vertical plane S coincides with the center O and is perpendicular to the axis of the flow channel 51. The distance between the vertical plane S and the center A is greater than the radius of the flow channel 51.

[0055] Reference Figure 5 The high pressure ball valve also includes a valve seat 6 and an elastic member 7.

[0056] The valve seat 6 is cylindrical or annular, and is slidably embedded in the valve cavity 11. The outer peripheral surface of the valve seat 6 is used for sliding sealing with the valve body 1, and the valve seat 6 is used to fit to the valve ball 5.

[0057] The elastic member 7 is connected between the valve seat 6 and the valve body 1 , and the elastic member 7 makes the valve seat 6 have a tendency to approach the spherical center O.

[0058] In the drawings of this embodiment: the valve seat 6 includes a ring seat 61, a matching ring 62 and a sealing ring 63; the elastic member 7 includes a spring.

[0059] An embedding groove 611 is coaxially provided at the outer circumference of one end of the ring seat 61. A matching ring 62 is coaxially connected to the outer circumference of the other end of the ring seat 61, and the end surface of the matching ring 62 is used for the elastic member 7 to be squeezed.

[0060] The gap X1 between the embedding groove 611 of the ring seat 61 and the valve cavity 11, the gap X2 between the outer circumference of the ring seat 61 and the valve cavity 11, and the gap X3 between the outer circumference of the matching ring 62 and the valve cavity 11 are: X3>X1>X2 (unit: mm).

[0061] A clamping groove 612 is coaxially arranged at the embedding groove 611, and the clamping groove 612 is used for the rubber ring to be embedded, and the rubber ring is tightly attached to the clamping groove 612 and the valve cavity 11. The rubber ring is used to provide a flexible guide for the sliding of the valve seat 6 to prevent the valve seat 6 from getting stuck.

[0062] An annular groove 613 is provided on the outer peripheral surface of the middle part of the ring seat 61 , and the annular groove 613 is used for inserting a sealing rubber ring so as to realize sliding sealing between the outer peripheral surface of the ring seat 61 and the inner wall of the valve cavity 11 by using the sealing rubber ring.

[0063] A sealing groove 614 is coaxially provided on the end surface of the ring seat 61 , and a sealing ring 63 is embedded in the sealing groove 614 . The sealing ring 63 is used to press against the valve ball 5 . It should be noted that the inner diameter of the sealing ring 63 is larger than the diameter of the flow channel 51 .

[0064] The valve seat 6 is further provided with a through hole 64, one end of which is connected to the embedding groove 611, and the other end of which is used to connect to the flow channel 51. For example, when the high-pressure ball valve is in an open state, the through hole 64 is connected to the flow channel 51.

[0065] The implementation principle of Example 1 is as follows: by providing a positioning groove 13 on the valve body 1 and a positioning surface 22 on the stuffing box 2, the stuffing box 2 is effectively prevented from rotating due to the torque when the valve is opened or closed. This design not only improves the sealing reliability of the connection between the stuffing box 2 and the valve body 1, but also reduces the risk of the bolts being subjected to shear force, thereby extending the service life of the valve.

[0066] By introducing the conical sealing packing 3 and the pressure ring 4, an efficient seal is achieved between the valve stem and the stuffing box 2. When the valve is working, the medium pressure will push the sealing packing 3 upward, so that its inner side is tightly attached to the valve stem and its outer side is tightly attached to the stuffing box 2, thus forming a double sealing effect. Even in the process of frequent opening and closing, the sealing packing 3 will automatically compensate for wear under the action of pressure to maintain continuous sealing performance.

[0067] By providing the pressure relief hole 52 on the valve ball 5, the problem of the valve ball 5 being easily deformed in a high pressure environment 4 is effectively solved. When the valve is gradually opened from a closed state, the pressure relief hole 52 will be opened in advance before the sealing surface of the valve seat 6 reaches the ball port, and the high pressure in the ball body is released in time, thereby avoiding the risk of deformation of the valve ball 5 due to excessive pressure.

[0068] By introducing the valve seat 6 and the elastic member 7, a dynamic seal between the valve seat 6 and the ball is achieved. When the valve is working, the elastic member 7 will continue to provide a certain thrust, so that the valve seat 6 is always close to the ball, thereby ensuring a good sealing effect. Even in the high-frequency opening and closing process, the valve seat 6 can quickly return to its original position under the action of the elastic member 7 and continue to maintain a sealed state.

[0069] Example 2 Reference Figure 6 The difference between this embodiment and embodiment 1 is that a magnet 8 is embedded in the valve ball 5 ; and there is a distance between the magnet 8 and the rotation axis of the valve ball 5 .

[0070] The inner wall of the valve cavity 11 is provided with an embedded hole 14, in which a piston 9 is slidably embedded. The piston 9 and the magnet 8 can be attracted by magnetic force. The piston 9 and the inner periphery of the embedded hole 14 are slidably sealed.

[0071] If necessary, a tension spring may be arranged in the embedding hole 14 , and the tension spring makes the piston 9 have a tendency to move away from the center O of the valve ball 5 .

[0072] The implementation principle of Example 2 is as follows: when the high-pressure ball valve is in an open state, the magnetic force between the magnet 8 and the piston 9 is the largest, and the magnetic force causes the piston 9 to move toward the valve ball 5; at this time, the volume of the portion of the embedded hole 14 connected to the valve cavity 11 is the smallest. When the high-pressure ball valve is in a closed state, the magnetic force between the magnet 8 and the piston 9 is minimum, and the piston 9 moves away from the valve ball 5; at this time, the volume of the part of the hole connected to the valve cavity 11 is the largest, so as to reduce the liquid pressure in the valve cavity 11, thereby reducing the pressure at the sealing parts such as the valve stem, which is beneficial to ensure the life of the high-pressure ball valve.

[0073] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A high pressure ball valve, characterized in that: It consists of a valve body (1) and a stuffing box (2). The valve body (1) is provided with a mounting opening (12), wherein the mounting opening (12) is used for the valve stem to be rotatably inserted therein. The stuffing box (2) is provided with a mounting hole (21), the stuffing box (2) is used to be sleeved onto the outside of the valve stem, and the mounting hole (21) is used to communicate with the mounting port (12). The outer surface of the valve body (1) is provided with a positioning groove (13). A positioning surface (22) is provided on the outer surface of the stuffing box (2), and the positioning surface (22) is used to fit onto the groove wall of the positioning groove (13). At least two points on the positioning surface (22) have different distances from the axis of the mounting hole (21).

2. The high pressure ball valve according to claim 1, characterized in that: It also includes a sealing packing (3), The sealing filler (3) is in the shape of a cone ring and is used for sealing between the outer peripheral surface of the valve stem and the inner peripheral surface of the mounting hole (21).

3. The high pressure ball valve according to claim 2, characterized in that: It also includes a pressure ring (4), The small diameter end of the sealing packing (3) faces the interior of the valve body (1). The pressure ring (4) is connected to the stuffing box (2), the pressure ring (4) is used to be sleeved outside the valve stem, and the pressure ring (4) is used to contact the large diameter end of the sealing stuffing (3).

4. The high pressure ball valve according to claim 3, characterized in that: The bolt passes through the compression ring (4) and is threadedly connected to the stuffing box (2). The pressure ring (4) is used to extrude the sealing filler (3).

5. The high pressure ball valve according to claim 4, characterized in that: The pressure ring (4) comprises a ring plate (41) and a sleeve (42). The bolts pass through the ring plate (41) and are threadedly connected to the stuffing box (2). One end of the sleeve (42) is used to extrude the sealing filler (3). The other end of the sleeve (42) is configured as a spherical surface, and the ring plate (41) fits the spherical surface.

6. The high pressure ball valve according to claim 1, characterized in that: It also includes a valve ball (5), The valve body (1) is provided with a valve cavity (11), and the valve ball (5) is located in the valve cavity (11). The valve ball (5) is provided with a flow channel (51), and a pressure relief hole (52) is provided on the inner circumferential surface of the flow channel (51). The pressure relief hole (52) penetrates to the outer surface of the valve ball (5). A line L is formed between the center A of the opening of the pressure relief hole (52) on the outer surface of the valve ball (5) and the center O of the valve ball (5). The connecting line L and the axis of the flow channel (51) do not coincide with each other.

7. The high pressure ball valve according to claim 6, characterized in that: A vertical plane S coincident with the center O of the sphere and perpendicular to the axis of the flow channel (51), The distance between the vertical plane S and the center A is greater than the radius of the flow channel (51).

8. The high pressure ball valve according to claim 6, characterized in that: It also includes a valve seat (6) and an elastic member (7), The valve seat (6) is cylindrical or annular, and is slidably embedded in the valve cavity (11). The outer peripheral surface of the valve seat (6) is used for sliding sealing with the valve body (1), and the valve seat (6) is used to fit onto the valve ball (5). The elastic member (7) is connected between the valve seat (6) and the valve body (1), and the elastic member (7) causes the valve seat (6) to have a tendency to approach the spherical center O.

9. The high pressure ball valve according to claim 8, characterized in that: A through hole (64) is provided on the outer peripheral surface of the valve seat (6), and the other end of the through hole (64) is connected to the valve cavity (11).

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