ball valve

Abstract

The utility model provides a kind of ball valve.The ball valve includes: valve body, is equipped with valve cavity;Two bonnet assemblies are respectively connected in the two sides of valve body, and bonnet assembly has overflow passage;Valve core, valve core has central through-hole, and valve core is rotatably installed in valve cavity, to change the position of central through-hole to control the connection and disconnection of two overflow passages;Wherein, any one bonnet assembly of two bonnet assemblies is equipped with pressure relief passage, and the valve cavity space between valve body and valve core is communicated with the overflow passage on the bonnet assembly where pressure relief passage is located by pressure relief passage, to discharge refrigerant in valve cavity space to outside valve body.The technical scheme of the utility model solves the problem that the cavity of the ball valve in the prior art is bulged due to the pressure rise caused by the residual refrigerant.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and more specifically, to a ball valve. Background Technology

[0002] Ball valves, as a common fluid control valve, are widely used in various piping systems in industry, commerce, and residential applications, especially in air conditioning, refrigeration, and HVAC systems, to control the flow of refrigerants or other fluids. Ball valves generally employ bidirectional sealing, meaning that sealing structures are installed on both sides of the ball valve to ensure effective fluid containment when the valve is closed.

[0003] However, when the ball valve is closed, and the valve cavity is in a sealed state, a certain amount of refrigerant remains inside the valve body. When the ambient temperature rises, the refrigerant remaining inside the valve body will expand due to heat, causing the internal pressure of the valve body to rise. Since the valve body wall is relatively thin, this usually leads to the valve body bulging and deforming, making it difficult to turn the valve core again and causing the valve core to get stuck inside the valve body. This will affect the normal operation and service life of the ball valve. Utility Model Content

[0004] The main purpose of this invention is to provide a ball valve to solve the problem of bulging of the cavity caused by refrigerant residue pressure rise in existing ball valves.

[0005] To achieve the above objectives, this utility model provides a ball valve, comprising: a valve body having a valve cavity; two valve cover assemblies respectively connected to both sides of the valve body, each valve cover assembly having a flow passage; and a valve core having a central through hole, the valve core being rotatably mounted in the valve cavity to control the connection and disconnection of the two flow passages by changing the position of the central through hole; wherein, either of the two valve cover assemblies is provided with a pressure relief channel, and the valve cavity space between the valve body and the valve core is connected to the flow passage on the valve cover assembly where the pressure relief channel is located through the pressure relief channel to discharge the refrigerant in the valve cavity space to the valve body.

[0006] Furthermore, the valve cover assembly includes a valve cover and a seal. The valve cover is connected to the valve body, and the seal is located between the valve cover and the valve core. The two valve cover assemblies are a first valve cover assembly and a second valve cover assembly, respectively. At least one of the valve cover and the seal of the first valve cover assembly is provided with a pressure relief channel. The seal of the second valve cover assembly is in sealing cooperation with the valve core and the valve cover of the second valve cover assembly, respectively.

[0007] Furthermore, the sealing element of the first valve cover assembly has a pressure relief groove on the wall surface that mates with the valve core. The pressure relief groove extends from one side of the sealing element to the other side of the sealing element to form at least a partial pressure relief channel.

[0008] Furthermore, the surface of the valve core that mates with the seal has a notch, the position of which corresponds to the pressure relief groove, and the notch and the pressure relief groove together form a pressure relief channel.

[0009] Furthermore, the seal has a mating hole and a flow passage communicating with the mating hole. The inner wall surface of the mating hole mates with the valve core and is provided with a pressure relief groove. The pressure relief groove extends from the end face of the seal facing the valve core to the inner wall surface of the flow passage.

[0010] Furthermore, a pressure relief groove is provided between the seal of the first valve cover assembly and the valve cover, and the pressure relief groove connects the valve cavity space with the flow passage on the valve cover assembly where the pressure relief channel is located.

[0011] Furthermore, the pressure relief groove includes a first groove and a second groove communicating with the first groove. Along the axial direction of the seal, the first groove penetrates the seal, and along the radial direction of the seal, the second groove penetrates the seal. The first groove communicates with the valve cavity space, and the second groove communicates with the flow passage of the valve cover of the first valve cover assembly.

[0012] Furthermore, the pressure relief groove is an arc-shaped groove.

[0013] Furthermore, the valve cover includes a mounting hole and a flow hole communicating with the mounting hole. The inner diameter of the mounting hole is larger than the inner diameter of the flow hole. The mounting hole is used to install a seal and cooperates with the seal. The valve cover of the first valve cover assembly is provided with a pressure relief channel. The pressure relief channel extends from the end face of the valve cover toward the valve cavity space and penetrates to the inner wall surface of the flow hole.

[0014] Furthermore, the mounting hole of the valve cover of the first valve cover assembly is provided with a pressure relief groove on the wall surface that mates with the seal. The pressure relief groove includes a third groove and a fourth groove communicating with the third groove. The third groove is located on the circumferential inner wall of the mounting hole and extends axially along the mounting hole to the end face of the valve cover facing the valve cavity space. The fourth groove is located on the stepped surface between the mounting hole and the flow hole and extends radially along the mounting hole to the inner wall surface of the flow hole.

[0015] Furthermore, there is one pressure relief channel; or, there are multiple pressure relief channels, which are arranged at circumferential intervals along the valve cover assembly.

[0016] By applying the technical solution of this utility model, and by setting a pressure relief channel, when the ball valve is closed, the residual refrigerant in the valve cavity can enter the flow channel on the valve cover assembly through the pressure relief channel, thereby discharging the refrigerant to the outside of the valve body. This solves the problem of increased internal pressure in the valve cavity due to refrigerant residue when the ball valve is closed, effectively preventing the valve body from bulging. This avoids valve body deformation, thus preventing the valve core from becoming stuck in the valve body due to difficulty in rotating it again, and consequently, avoiding affecting the normal operation and service life of the ball valve. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0018] Figure 1 A schematic diagram of one embodiment of the ball valve of this utility model is shown;

[0019] Figure 2 It shows Figure 1 Side view of the ball valve;

[0020] Figure 3 It shows Figure 1 A cross-sectional view of a ball valve;

[0021] Figure 4 It shows Figure 3 A partial enlarged view of the ball valve;

[0022] Figure 5 It shows Figure 1 A schematic diagram of the structure of the seal of the first valve seat assembly of a ball valve;

[0023] Figure 6 A partial view of another embodiment of the ball valve of this utility model is shown;

[0024] Figure 7 A schematic diagram of another embodiment of the seal of the first valve seat assembly of the ball valve of this utility model is shown;

[0025] Figure 8 Cross-sectional views of some further embodiments of the ball valve of this utility model are shown;

[0026] Figure 9 It shows Figure 8 A partial enlarged view of the ball valve;

[0027] Figure 10 It shows Figure 8 A schematic diagram of the valve seat structure of the first valve seat assembly of a ball valve;

[0028] Figure 11 It shows Figure 5 A cross-sectional view of the seal;

[0029] Figure 12 It shows Figure 7 A cross-sectional view of the seal;

[0030] Figure 13 It shows Figure 10 A cross-sectional view of the valve seat.

[0031] The above figures include the following reference numerals:

[0032] 10. Valve body; 11. Valve cavity space; 20. Valve cover assembly; 21. Flow passage; 22. Valve cover; 221. Mounting hole; 222. Flow hole; 23. Seal; 231. Mating hole; 232. Flow hole; 30. Valve core; 40. Pressure relief passage; 41. First groove; 42. Second groove; 43. Third groove; 44. Fourth groove; 50. Valve stem assembly; 71. First connecting pipe; 72. Second connecting pipe. Detailed Implementation

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0034] like Figures 1 to 10 As shown, an embodiment of this utility model provides a ball valve, including: a valve body 10 with a valve cavity; two valve cover assemblies 20 respectively connected to both sides of the valve body 10, each valve cover assembly 20 having a flow passage 21; a valve core 30 having a central through hole, the valve core 30 being rotatably mounted in the valve cavity to change the position of the central through hole to control the connection and disconnection of the two flow passages 21; wherein, either of the two valve cover assemblies 20 is provided with a pressure relief channel 40, and the valve cavity space 11 between the valve body 10 and the valve core 30 is connected to the flow passage 21 on the valve cover assembly 20 where the pressure relief channel 40 is located through the pressure relief channel 40, so as to discharge the refrigerant in the valve cavity space 11 to the outside of the valve body 10.

[0035] In the above technical solution, by setting a pressure relief channel 40, when the ball valve is closed, the residual refrigerant in the valve cavity space 11 can enter the flow passage 21 on the valve cover assembly 20 through the pressure relief channel 40, thereby discharging the refrigerant to the outside of the valve body 10. This solves the problem of increased internal pressure in the valve cavity space 11 due to refrigerant residue when the ball valve is closed, effectively preventing the valve body 10 from bulging. This avoids deformation of the valve body 10, thus preventing the valve core from becoming stuck in the valve body due to difficulty in rotating the valve core again, and thus avoiding affecting the normal operation and service life of the ball valve.

[0036] It should be noted that one of the two valve cover assemblies 20 is provided with a pressure relief channel 40, and the other valve cover assembly 20 is sealed with the valve core 30. When the ball valve is closed, the ball valve can be sealed on one side to disconnect the two flow channels 21.

[0037] In some embodiments, the valve core 30 is spherical. When the ball valve is in the open state, both ends of the central through hole are connected to the flow channel 21. When the ball valve is in the closed state, both ends of the central through hole are not connected to the flow channel 21, that is, the axis of the central through hole is perpendicular to the axis of the flow channel 21. At this time, the ball valve is in the closed state.

[0038] like Figures 1 to 10 As shown, in some embodiments, the valve cover assembly 20 includes a valve cover 22 and a seal 23. The valve cover 22 is connected to the valve body 10, and the seal 23 is located between the valve cover 22 and the valve core 30. The two valve cover assemblies 20 are a first valve cover assembly and a second valve cover assembly, respectively. At least one of the valve cover 22 and the seal 23 of the first valve cover assembly is provided with a pressure relief channel 40. The seal 23 of the second valve cover assembly is in sealing cooperation with the valve core 30 and the valve cover 22 of the second valve cover assembly, respectively.

[0039] In the above technical solution, by distinguishing the functions of the two valve cover assemblies 20—one serving as the carrier of the pressure relief channel 40, and the other maintaining its original sealing performance—the one-way pressure relief capability of the ball valve can be achieved. Specifically, when the ball valve is in the closed state, refrigerant remains in the valve cavity. Through the pressure relief channel 40 on the first valve cover assembly, the refrigerant can be guided to the outside, preventing excessive internal pressure. This not only solves the pressure problem caused by refrigerant residue but also maintains the sealing characteristics of the ball valve.

[0040] In some embodiments, the seal 23 is an annular sealing gasket.

[0041] In some embodiments, the ball valve further includes a first connecting pipe 71 and a second connecting pipe 72. The first connecting pipe 71 is connected to the valve cover 22 of the first valve cover assembly, and the second connecting pipe 72 is connected to the valve cover 22 of the second valve cover assembly. The interiors of the first connecting pipe 71 and the second connecting pipe 72 are respectively connected to two flow passages 21, and the residual refrigerant in the valve cavity space 11 can be discharged through the pressure relief passage 40 on the first valve cover assembly and the first connecting pipe 71.

[0042] like Figures 1 to 10 As shown, in some embodiments, there is one pressure relief channel 40; or, there are multiple pressure relief channels 40, which are arranged at circumferential intervals along the valve cover assembly 20.

[0043] The above technical solution provides a flexible pressure relief strategy by setting one or more pressure relief channels 40. Specifically, whether it is a single or multiple pressure relief channels 40, the refrigerant in the valve cavity space 11 can be guided to the outside after the ball valve is closed, preventing excessive internal pressure. Setting multiple pressure relief channels 40 can improve refrigerant discharge efficiency, and the dispersed arrangement of multiple pressure relief channels 40 can avoid the blockage risk that a single pressure relief channel 40 might cause.

[0044] In other embodiments, the number and distribution of the pressure relief channels 40 can be adjusted to accommodate ball valves of different sizes and shapes.

[0045] It should be noted that the valve cover assembly 20 has a circumferential flow passage 21.

[0046] like Figures 1 to 10 As shown, in some embodiments, the ball valve further includes a valve stem assembly 50, and the valve body 10 is also provided with an assembly hole communicating with the valve cavity. One end of the valve stem assembly 50 is connected to the valve core 30, and the other end of the valve stem assembly 50 extends out of the assembly hole. The valve stem assembly 50 is used to drive the valve core 30 to rotate.

[0047] In the above technical solution, by transmitting the rotational motion of the valve stem assembly 50 to the valve core 30, the valve core 30 rotates within the valve cavity, thereby controlling the opening and closing of the two flow channels 21.

[0048] In some embodiments, the valve stem assembly 50 includes a valve stem, a valve stem seal, a valve stem guide bushing, and an operating handle. The valve stem is used to connect the operating handle and the valve core 30. One end of the valve stem is connected to the operating handle via a thread or keyway, and the other end passes through the guide bushing at the center of the valve body 10 and engages with the drive interface of the valve core 30 to ensure smooth transmission of rotational motion. The specific structure of the valve stem assembly 50 can adopt existing technology, which will not be described in detail here.

[0049] like Figures 1 to 5 as well as Figure 11 As shown, in some embodiments of the present invention, the sealing member 23 of the first valve cover assembly has a pressure relief groove on the wall surface that mates with the valve core 30. The pressure relief groove extends from one side of the sealing member 23 to the other side of the sealing member 23 to form at least a partial pressure relief channel 40.

[0050] In the above technical solution, by opening a pressure relief groove on the wall surface where the seal 23 contacts the valve core 30, the path of refrigerant from the liquid-filled valve cavity space 11 to the outside is directly opened. When the valve core 30 rotates to the closed position, the pressure relief groove on the seal 23 becomes the outlet of the refrigerant. As the refrigerant is discharged, the internal pressure gradually decreases, so as to solve the pressure problem caused by refrigerant residue. The above structure is simple, reduces manufacturing costs, and also reduces the possibility of refrigerant residue.

[0051] In some embodiments, a pressure relief through hole can also be provided on the seal 23, which extends from one side of the seal 23 to the other side of the seal 23, thereby achieving the pressure relief function.

[0052] In one embodiment of this invention, the surface of the valve core 30 that mates with the sealing element 23 has a cutout, the position of which corresponds to the pressure relief groove. The cutout and the pressure relief groove together form a pressure relief channel 40. This increases the cross-sectional area of ​​the pressure relief channel 40, thereby improving the pressure relief speed.

[0053] Of course, in some embodiments, a pressure relief groove may be provided only on the seal of the first valve cover assembly; or, a cut may be provided only on the surface of the valve core 30 that mates with the seal 23, the cut being used to connect the valve cavity space 11 with the flow passage 21 on the valve cover assembly 20 where the pressure relief passage 40 is located.

[0054] like Figure 5 As shown, in one embodiment of the present invention, the sealing member 23 has a mating hole 231 and a flow hole 232 communicating with the mating hole 231. The inner wall surface of the mating hole 231 is mated with the valve core 30 and is provided with a pressure relief groove. The pressure relief groove extends from the end face of the sealing member 23 facing the valve core 30 to the inner wall surface of the flow hole 232.

[0055] With the above settings, when the ball valve is closed, the refrigerant remaining in the valve cavity space 11 can flow through the pressure relief groove to the flow passage 232, and then be discharged to the outside of the valve body 10 through the flow passage 232, thereby realizing the timely release of the accumulated liquid and avoiding the valve body bulging phenomenon.

[0056] In one embodiment of the present invention, the pressure relief groove is an inclined groove extending between the radial and axial directions of the seal 23.

[0057] It should be noted that the axial direction of the seal is parallel to the extension direction of the flow channel 21, and the radial direction of the seal is perpendicular to the axial direction of the seal.

[0058] Specifically, in some other embodiments of this utility model, the location and specific structure of the pressure relief groove can be designed differently from the above-described schemes, such as... Figure 6 , Figure 7 and Figure 12 As shown, a pressure relief groove is provided between the seal 23 and the valve cover 22 of the first valve cover assembly. The pressure relief groove connects the valve cavity space 11 with the flow passage 21 on the valve cover assembly 20 where the pressure relief channel 40 is located. In this way, by providing a pressure relief groove between the seal 23 and the valve cover 22 of the first valve cover assembly, the path for refrigerant to flow from the liquid-filled valve cavity space 11 to the outside can be opened. When the valve core 30 rotates to the closed position, the pressure relief groove becomes the outlet for the refrigerant. As the refrigerant is discharged, the internal pressure gradually decreases, thereby solving the problem of valve body bulging caused by refrigerant residue.

[0059] Specifically, the sealing member 23 of the first valve cover assembly has a pressure relief groove on the wall surface that mates with the valve cover 22. The pressure relief groove extends from one side of the sealing member 23 to the other side of the sealing member 23 to form a pressure relief channel 40.

[0060] In the above technical solution, by opening a pressure relief groove on the wall surface of the seal 23 that mates with the valve cover 22, another pressure relief path can be provided. That is, when the ball valve is closed, the pressure relief groove on the seal 23 becomes the outlet of the refrigerant. As the refrigerant is discharged, the internal pressure gradually decreases, so as to solve the problem of valve body bulging caused by refrigerant residue. The above structure is simple, reduces manufacturing costs, and also reduces the possibility of refrigerant residue.

[0061] In some embodiments, the pressure relief groove may also be located on the surface of the valve cover that mates with the seal (i.e., the inner surface of the valve cover).

[0062] Of course, in some embodiments, pressure relief grooves are provided on the surface of the valve cover that mates with the seal and on the wall surface of the seal 23 that mates with the valve cover 22. In this way, the pressure relief grooves on both together form the pressure relief channel 40.

[0063] like Figure 6 and Figure 7 As shown, in some other embodiments of the present invention, the pressure relief groove includes a first groove 41 and a second groove 42 communicating with the first groove 41. Along the axial direction of the seal 23, the first groove 41 penetrates the seal 23, and along the radial direction of the seal 23, the second groove 42 penetrates the seal 23. The first groove 41 communicates with the valve cavity space 11, and the second groove 42 communicates with the flow passage 21 of the valve cover 22 of the first valve cover assembly.

[0064] In the above technical solution, the first groove 41 is responsible for drawing out the refrigerant from the valve cavity space 11, while the second groove 42 guides the refrigerant into the interior of the valve cover 22, thereby ensuring the effective discharge of the refrigerant. This avoids refrigerant residue and solves the problem of valve body bulging caused by refrigerant residue.

[0065] It should be noted that the second groove 42 is connected to the flow hole 222 of the valve cover 22.

[0066] For example, in some other embodiments of this utility model, the first groove 41 and the second groove 42 form an L-shaped pressure relief groove.

[0067] In some embodiments, the pressure relief groove may also be an arc-shaped groove.

[0068] In further embodiments of this utility model, the location and specific structure of the pressure relief channel 40 under different design schemes are also provided. Specifically, for example... Figures 8 to 10 as well as Figure 13As shown, the valve cover 22 includes a mounting hole 221 and a flow hole 222 communicating with the mounting hole 221. The inner diameter of the mounting hole 221 is larger than the inner diameter of the flow hole 222. The mounting hole 221 is used to install the seal 23 and cooperates with the seal 23. The valve cover 22 of the first valve cover assembly is provided with a pressure relief channel 40. The pressure relief channel 40 extends from the end face of the valve cover 22 toward the valve cavity space 11 and penetrates to the inner wall surface of the flow hole 222. The seal 23 is not provided with a pressure relief channel 40.

[0069] In the above technical solution, when the ball valve is closed and there is residual refrigerant inside, the residual refrigerant can flow from the valve cavity space 11 into the flow hole 222 through the pressure relief channel 40 on the end face of the valve cover 22 of the first valve cover assembly toward the valve cavity space 11, thereby being discharged to the outside of the valve body 10. This ensures that even in the closed state, the valve cavity space 11 can be connected to the external environment through the pressure relief channel 40 on the valve cover 22, so as to discharge the residual refrigerant and thus avoid the occurrence of valve body bulging.

[0070] like Figure 9 and Figure 10 As shown, in some other embodiments of the present invention, a pressure relief groove is provided on the wall surface of the mounting hole 221 of the valve cover 22 of the first valve cover assembly that mates with the seal 23. The pressure relief groove includes a third groove 43 and a fourth groove 44 communicating with the third groove 43. The third groove 43 is located on the circumferential inner wall of the mounting hole 221 and extends axially along the mounting hole 221 to the end face of the valve cover 22 facing the valve cavity space 11. The fourth groove 44 is located on the stepped surface between the mounting hole 221 and the flow hole 222 and extends radially along the mounting hole 221 to the inner wall surface of the flow hole 222.

[0071] In the above technical solution, the third groove 43 receives refrigerant from the valve cavity space 11, and the fourth groove 44 guides the refrigerant from the third groove 43 to the flow hole 222, which can ensure the smooth discharge of refrigerant. It can also ensure that even in the closed state, the valve cavity space 11 can be connected to the external environment through the pressure relief channel 40 on the valve cover 22, so as to discharge residual refrigerant and thus avoid the occurrence of valve body bulging.

[0072] In some embodiments, the pressure relief channel 40 may also be a pressure relief through hole provided on the valve cover 22.

[0073] In some embodiments, pressure relief grooves may be provided on both the valve cover 22 and the seal 23 to achieve a dual pressure relief effect.

[0074] As can be seen from the above description, the above embodiments of this utility model achieve the following technical effects: By setting a pressure relief channel, when the ball valve is closed, the residual refrigerant in the valve cavity space can enter the flow channel on the valve cover assembly through the pressure relief channel, thereby discharging the refrigerant to the outside of the valve body. This solves the problem of increased internal pressure in the valve cavity space due to refrigerant residue when the ball valve is closed, effectively preventing the valve body from bulging. This avoids deformation of the valve body, thus preventing the valve core from becoming stuck in the valve body due to difficulty in rotating the valve core again, and thus avoiding affecting the normal operation and service life of the ball valve.

[0075] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A ball valve, characterized in that include: The valve body (10) is provided with a valve cavity; Two valve cover assemblies (20) are respectively connected to both sides of the valve body (10), and the valve cover assembly (20) has a flow passage (21); The valve core (30) has a central through hole and is rotatably mounted in the valve cavity to change the position of the central through hole to control the connection and disconnection of the two flow channels (21); In this embodiment, either of the two valve cover assemblies (20) is provided with a pressure relief channel (40), and the valve cavity space (11) between the valve body (10) and the valve core (30) is connected to the flow passage (21) on the valve cover assembly (20) where the pressure relief channel (40) is located through the pressure relief channel (40) so as to discharge the refrigerant in the valve cavity space (11) to the outside of the valve body (10).

2. The ball valve according to claim 1, characterized in that The valve cover assembly (20) includes a valve cover (22) and a seal (23). The valve cover (22) is connected to the valve body (10). The seal (23) is located between the valve cover (22) and the valve core (30). The two valve cover assemblies (20) are a first valve cover assembly and a second valve cover assembly, respectively. At least one of the valve cover (22) and the seal (23) of the first valve cover assembly is provided with the pressure relief channel (40), and the seal (23) of the second valve cover assembly is respectively sealed to the valve core (30) and the valve cover (22) of the second valve cover assembly.

3. The ball valve of claim 2, wherein The sealing element (23) of the first valve cover assembly has a pressure relief groove on the wall surface that mates with the valve core (30). The pressure relief groove extends from one side of the sealing element (23) to the other side of the sealing element (23) to form at least a portion of the pressure relief channel (40).

4. The ball valve according to claim 3, characterized in that The valve core (30) has a cut on the surface that mates with the seal (23), the position of the cut corresponding to the pressure relief groove, and the cut and the pressure relief groove together constitute the pressure relief channel (40).

5. The ball valve of claim 3, wherein The seal (23) has a mating hole (231) and a flow hole (232) communicating with the mating hole (231). The inner wall surface of the mating hole (231) mates with the valve core (30) and is provided with the pressure relief groove. The pressure relief groove extends from the end face of the seal (23) facing the valve core (30) to the inner wall surface of the flow hole (232).

6. The ball valve of claim 2, wherein A pressure relief groove is provided between the seal (23) of the first valve cover assembly and the valve cover (22), and the pressure relief groove connects the valve cavity space (11) and the flow passage (21) on the valve cover assembly (20) where the pressure relief channel (40) is located.

7. The ball valve of claim 6, wherein The pressure relief groove includes a first groove (41) and a second groove (42) communicating with the first groove (41). Along the axial direction of the seal (23), the first groove (41) penetrates the seal (23). Along the radial direction of the seal (23), the second groove (42) penetrates the seal (23). The first groove (41) communicates with the valve cavity space (11), and the second groove (42) communicates with the flow passage (21) of the valve cover (22) of the first valve cover assembly.

8. The ball valve according to claim 6, characterized in that, The pressure relief groove is an arc-shaped groove.

9. The ball valve of claim 2, wherein, The valve cover (22) includes a mounting hole (221) and a flow hole (222) communicating with the mounting hole (221). The inner diameter of the mounting hole (221) is larger than the inner diameter of the flow hole (222). The mounting hole (221) is used to install the seal (23) and cooperates with the seal (23). The valve cover (22) of the first valve cover assembly is provided with the pressure relief channel (40). The pressure relief channel (40) extends from the end face of the valve cover (22) facing the valve cavity space (11) and penetrates to the inner wall surface of the flow hole (222).

10. The ball valve of claim 9, wherein, The mounting hole (221) of the valve cover (22) of the first valve cover assembly has a pressure relief groove on the wall surface that mates with the seal (23). The pressure relief groove includes a third groove (43) and a fourth groove (44) communicating with the third groove (43). The third groove (43) is located on the circumferential inner wall of the mounting hole (221) and extends axially along the mounting hole (221) to the end face of the valve cover (22) facing the valve cavity space (11). The fourth groove (44) is located on the stepped surface between the mounting hole (221) and the flow hole (222). The fourth groove (44) extends radially along the mounting hole (221) to the inner wall surface of the flow hole (222).

11. Ball valve according to any of claims 1 to 10, characterized in that The pressure relief channel (40) is one; or, the pressure relief channel (40) is multiple, and the multiple pressure relief channels (40) are arranged at circumferential intervals along the valve cover assembly (20).

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