Ball valve with large exhaust drift diameter

Abstract

The invention discloses a large-exhaust-drift-diameter ball valve, and belongs to the field of ball valves.The ball valve body comprises a valve body, an outer valve top is fixedly installed at the top of the valve body, a valve element is rotationally arranged in the valve body, the outer surface of the valve element is fixedly sleeved with a valve seat, the outer surface of the valve element is fixedly connected with a valve rod, and the top of the valve rod penetrates through the outer valve top to be fixedly connected with a valve deck; the inner wall of the outer valve top is fixedly sleeved with an inner valve top. Through the arrangement of the outer packing ring, the inner packing ring and the macromolecular water-absorbing expansion material, when the ball valve is aged and leaks water after being used and abraded for a long time, the macromolecular water-absorbing expansion material in the inner packing ring absorbs water, and the macromolecular water-absorbing expansion material expands in the ring groove, so that the pressure of the inner packing ring and the outer packing ring is increased; the aged and shrunk filler body can play a sealing role again, even if the ball valve leaks water, the ball valve can be continuously used for a period of time, resource waste is avoided, and enough time can be provided for workers to reflect and overhaul.

Description

Technical Field

[0001] The invention relates to the field of ball valves, and more particularly to a ball valve with a large exhaust diameter. Background Art

[0002] Ball valve is a common type of valve, and its main feature is that it uses a rotating ball to control the flow of fluid. This valve is usually used to open or close the fluid channel, rather than to adjust the flow or pressure. The advantages of ball valve include simple structure, easy operation, good sealing performance, etc., so it is widely used in industrial and civil fields.

[0003] When industrial finished products are prepared, due to the large preparation volume and the large number of materials used, large exhaust diameter ball valves are often used to input or output water flow. Due to the long-term use of the ball valve, the valve core used to control the flow of water rotates repeatedly, and the valve seat is partially worn, which will cause a gap between the valve core and the valve body. As a result, when water flows through the large exhaust diameter ball valve inside the valve body, the water flows through the gap between the valve core and the valve body into the stuffing box. Due to the large exhaust diameter ball valve The internal water flow rate is large and the flow rate is fast, the water flow will generate a large pressure inside the ball valve. The water flow entering the stuffing box will cause pressure on the material in the stuffing box for a long time. The material in the stuffing box is under pressure for a long time. With the aging of the internal material of the stuffing box, the material inside the stuffing box will be compressed, resulting in a reduction in its volume, and the sealing performance will decrease accordingly, resulting in partial leakage of the valve stem. Summary of the invention

[0004] In view of the problems existing in the prior art, the object of the present invention is to provide a large exhaust diameter ball valve.

[0005] To solve the above problems, the present invention adopts the following technical solutions.

[0006] A large exhaust diameter ball valve, the ball valve body includes a valve body, an outer valve top is fixedly installed on the top of the valve body, a valve core is rotatably arranged inside the valve body, the outer surface of the valve core is fixedly sleeved with a valve seat, the outer surface of the valve core is fixedly connected to a valve stem, the top of the valve stem passes through the outer valve top and is fixedly connected to the valve cover, the inner wall of the outer valve top is fixedly sleeved with an inner valve top, the valve stem is rotatably sleeved on the inner wall of the inner valve top, a stuffing box is opened on the inner wall of the inner valve top, a stuffing body is fixedly installed in the stuffing box, the stuffing body is used to prevent fluid from leaking through the valve stem, the stuffing body includes an outer stuffing ring fixedly installed on the inner wall of the stuffing box, an inner stuffing ring is fixedly connected to the outer stuffing ring, the inner stuffing ring can expand after absorbing water inside, and the outer stuffing ring is used in conjunction with the inner stuffing ring.

[0007] Furthermore, an annular groove is provided inside the inner packing ring, and the interior of the annular groove is filled with a polymer water-absorbing expansion material. An expansion groove is provided inside one end of the outer packing ring close to the inner packing ring, and the expansion groove is the same size as the annular groove and is interconnected. The inner wall and outer wall of the outer packing ring are fixedly connected to the inner wall and outer wall of the inner packing ring, and the inner wall and outer wall of the outer packing ring close to one end of the inner packing ring are provided with multiple groups of flow channels.

[0008] Furthermore, the inner wall and the outer wall of the outer packing ring can seal the flow channel after being squeezed by the internal material of the expansion groove, and the material of the outer packing ring and the inner packing ring is PTFE.

[0009] Furthermore, two outer packing rings are provided and are symmetrically arranged in an upper and lower manner, the annular grooves are respectively located at the upper and lower ends of the inner packing ring, and an inner packing ring is fixedly connected between the two outer packing rings.

[0010] Furthermore, the outer packing ring separates the inner wall and the outer wall into multiple groups of protrusions through multiple groups of flow channels, and multiple groups of positioning blocks are fixedly installed on the outer surface of one end of the outer packing ring close to the inner packing ring. Multiple groups of positioning grooves are symmetrically opened at the upper and lower ends of the inner packing ring, and each group of positioning grooves is used in conjunction with a positioning block. The number of the positioning blocks can be the same as the number of protrusions.

[0011] Furthermore, an annular sliding cavity is provided inside the inner valve top, and an alarm component used in conjunction with the packing body is arranged inside the annular sliding cavity. The alarm component includes a slider slidably arranged inside the annular sliding cavity. A notch is provided on the inner wall of the inner valve top, and the annular sliding cavity is connected with the stuffing box through the notch. A top block is arranged in the notch, and the top block is used in conjunction with the slider. A first thrust spring is fixedly provided on the top of the top block, and the top of the first thrust spring is fixedly connected to the inner wall of the annular sliding cavity. The top of the top block is also fixedly connected to a long rod.

[0012] Furthermore, the long rod passes through the inner valve top from bottom to top and is fixedly connected to the alarm ring, the alarm ring is located at the top of the inner valve top, the alarm ring can be moved upward and out of the inner valve top, the top of the alarm ring is evenly distributed with three primary colors, and can produce a white visual effect when rotating.

[0013] Furthermore, a limit groove is provided inside the outer valve top, and a disassembly and assembly component is arranged in the limit groove, and the disassembly and assembly component is used in conjunction with a long rod, and the disassembly and assembly component includes a first limit plate slidably arranged in the limit groove, and a rectangular groove is provided inside the inner valve top, and the rectangular groove is located above the annular sliding cavity, and a second limit plate is slidably arranged in the rectangular groove, and the second limit plate is fixedly connected to the long rod, and a contraction groove is provided inside the second limit plate, and the first limit plate can slide into the contraction groove, and a second thrust spring is fixedly connected to the inner wall of the contraction groove, and the first limit plate is slidably arranged in the contraction groove through the second thrust spring, and the first limit plate is designed with a rounded corner on one side close to the inner wall of the limit groove.

[0014] Furthermore, the friction between the outer wall of the inner valve top and the inner wall of the outer valve top is smaller than the friction between the packing body and the valve stem after deformation, the annular sliding cavity has a guiding function for the upward and downward movement of the slider, and the top block is made of polyurethane.

[0015] Furthermore, the sliding block is tilted at one end close to the top block, the top of the top block is fixedly connected to the inner wall of the slot, the bottom of the top block is movably connected to the inner wall of the slot, the bottom of the top block is protruding, and the protruding part of the top block is tilted.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention arranges an outer packing ring, an inner packing ring and a high molecular water-absorbing expansion material. When the ball valve is worn out after long-term use and ages and leaks, the high molecular water-absorbing expansion material in the inner packing ring absorbs moisture and expands in the ring groove, thereby increasing the pressure of the inner packing ring and the outer packing ring, so that the aged and shrunk packing body can play a sealing role again. Even if the ball valve leaks, it can continue to be used for a period of time, avoiding waste of resources and allowing enough time for staff to report and carry out maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 It is a front cross-sectional view of the internal structure of the ball valve body of the present invention;

[0020] Figure 3 For the present invention Figure 2 A magnified view of the structure at A;

[0021] Figure 4 It is a side sectional view of the internal structure of the valve body of the present invention;

[0022] Figure 5 For the present invention Figure 4 A magnified view of the structure at B in FIG.

[0023] Figure 6 It is a front cross-sectional view of the internal structure of the valve body of the present invention;

[0024] Figure 7 For the present invention Figure 6 A magnified view of the structure at C in FIG.

[0025] Figure 8 An exploded view of the filler body of the present invention;

[0026] Fig. 9 For the present invention Figure 6 A magnified view of the structure at D in FIG.

[0027] Fig.10 For the present invention Figure 6 Enlarged view of the structure at E in FIG.

[0028] Description of the numbers in the figure:

[0029] 1. Ball valve body; 2. Inner valve top; 3. Stuffing box; 4. Stuffing body; 5. Alarm assembly; 6. Disassembly assembly; 7. Alarm ring; 11. Valve body; 12. Outer valve top; 13. Valve stem; 14. Valve core; 15. Valve cover; 16. Valve seat; 21. Ring sliding cavity; 22. Notch; 23. Rectangular groove; 41. Outer packing ring; 42. Inner packing ring; 51. Top block; 52. Slider; 53. First thrust spring; 54. Long rod; 61. First limit plate; 62. Second limit plate; 63. Second thrust spring; 121. Limit groove; 411. Ring groove; 412. Positioning groove; 421. Expansion groove; 422. Flow channel; 423. Positioning block; 621. Contraction groove. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0031] See also Figures 1 to 10A large exhaust diameter ball valve, the ball valve body 1 includes a valve body 11, an outer valve top 12 is fixedly installed on the top of the valve body 11, a valve core 14 is rotatably arranged inside the valve body 11, the outer surface of the valve core 14 is fixedly sleeved with a valve seat 16, the outer surface of the valve core 14 is fixedly connected to a valve stem 13, the top of the valve stem 13 passes through the outer valve top 12 and is fixedly connected to a valve cover 15, the inner wall of the outer valve top 12 is fixedly sleeved with an inner valve top 2, the valve stem 13 is rotatably sleeved on the inner wall of the inner valve top 2, a stuffing box 3 is opened on the inner wall of the inner valve top 2, a stuffing box 3 is fixedly installed with a stuffing body 4, the stuffing body 4 is used to prevent the fluid from leaking through the valve stem 13, the stuffing body 4 includes an outer stuffing ring 41 fixedly installed on the inner wall of the stuffing box 3, an inner stuffing ring 42 is fixedly connected to the outer stuffing ring 41, the inner stuffing ring 42 can expand after absorbing water inside, and the outer stuffing ring 41 is used in conjunction with the inner stuffing ring 42.

[0032] An annular groove 411 is provided inside the inner packing ring 42, and the interior of the annular groove 411 is filled with a polymer water-absorbing expansion material. An expansion groove 421 is provided inside the end of the outer packing ring 41 close to the inner packing ring 42. The expansion groove 421 is the same size as the annular groove 411 and is interconnected. The inner wall and outer wall of the outer packing ring 41 are fixedly connected to the inner wall and outer wall of the inner packing ring 42, and the inner wall and outer wall of the outer packing ring 41 close to the end of the inner packing ring 42 are provided with multiple groups of flow channels 422.

[0033] The ball valve body 1 is used for a long time, and the material inside the stuffing box 3 is aged and shrunk. At the same time, the valve seat 16 is worn for a long time, resulting in that when the water inside the valve body 11 flows through the gap between the valve seat 16 and the valve body 11 and enters the stuffing box 3, the water will first contact the stuffing body 4 in the stuffing box 3, enter the expansion groove 421 through the flow channel 422 on the outer stuffing ring 41 and fill the expansion groove 421, until the water contacts the material in the annular groove 411 and begins to absorb moisture, the polymer water-absorbing material will quickly absorb the moisture in the annular groove 411 and the expansion groove 421, and then expand and squeeze the inner and outer walls of the outer stuffing ring 41 and the inner stuffing ring 42, thereby increasing the pressure between the inner walls of the inner stuffing ring 42 and the outer stuffing ring 41 and the outer surface of the valve stem 13, and the pressure between the outer walls of the outer stuffing ring 41 and the inner stuffing ring 42 and the inner wall of the inner valve top 2 will also increase, so that the aged and shrunk stuffing body 4 can play a sealing role again, even if the ball valve leaks, it can continue to be used for a period of time, avoiding waste of resources, and allowing enough time for staff to report and carry out maintenance.

[0034] like Figures 4 to 8 As shown, the inner wall and the outer wall of the outer packing ring 41 can seal the flow channel 422 after being squeezed by the internal material of the expansion groove 421. The material of the outer packing ring 41 and the inner packing ring 42 is PTFE.

[0035] When the internal material of the stuffing box 3 ages and shrinks, water will flow into the expansion groove 421 through the flow channel 422 on the outer stuffing ring 41, and contact the water-absorbing expansion material in the annular groove 411. The water-absorbing expansion material expands to expand the annular groove 411 and the expansion groove 421. Under the limiting effect of the outer wall of the valve stem 13 and the inner wall of the inner valve top 2, the water-absorbing expansion material expands and squeezes the inner and outer walls of the inner stuffing ring 42 and the outer stuffing ring 41. Since the inner and outer walls of the outer stuffing ring 41 are squeezed by the internal material of the expansion groove 421, the flow channel 422 can be sealed. At this time, the inner and outer stuffing rings 42 and the outer stuffing rings 41 are closed. The inner and outer walls are deformed, the flow channel 422 is sealed, and the entire packing body 4 achieves a sealing effect. At the same time, after the flow channel 422 is sealed, it is prevented from continuing to flow through the flow channel 422 into the annular groove 411 and the expansion groove 421, so that the water-absorbing expansion material in the annular groove 411 and the expansion groove 421 absorbs water excessively and expands too much in volume, resulting in excessive pressure between the inner walls of the annular groove 411 and the expansion groove 421 and the outer wall of the valve stem 13 and the inner wall of the inner valve top 2, damaging the inner and outer walls of the inner packing ring 42 and the outer packing ring 41, thereby preventing the pressure of the packing body 4 in the stuffing box 3 from being too high and affecting the sealing effect of the packing body 4.

[0036] like Figures 4 to 8 As shown, two outer packing rings 41 are provided and are symmetrically arranged in an upper and lower manner. The annular grooves 411 are respectively located at the upper and lower ends of the inner packing ring 42 , and an inner packing ring 42 is fixedly connected between the two outer packing rings 41 .

[0037] The outer packing ring 41 separates the inner wall and the outer wall into multiple groups of protrusions through multiple groups of flow channels 422. Multiple groups of positioning blocks 423 are fixedly installed on the outer surface of one end of the outer packing ring 41 close to the inner packing ring 42. Multiple groups of positioning grooves 412 are symmetrically provided at the upper and lower ends of the inner packing ring 42. Each group of positioning grooves 412 is used in conjunction with a positioning block 423. The number of positioning blocks 423 can be the same as the number of protrusions.

[0038] The leakage degree at the valve stem 13 can be judged by the packing body 4. If the part of the outer packing ring 41 at the bottom with the flow channel 422 expands, the annular groove 411 at the lower end of the inner packing ring 42 expands, then it is only necessary to separate the outer packing ring 41 and the inner packing ring 42, and then use a wooden board to scrape a circle in the annular groove 411 at the lower end of the inner packing ring 42, clean the material that absorbs moisture and expands, replace it with a new material, and then take out the new outer packing ring 41, align the positioning block 423 with the positioning groove 412, press the outer packing ring 41 and the inner packing ring 42, and the outer packing ring 41 and the inner packing ring 42 can be replaced;

[0039] If it is observed that both the upper and lower ends of the inner packing ring 42 are expanded, it means that the water-absorbing expansion material in the annular groove 411 at the lower end of the inner packing ring 42 has lost its function and the annular groove 411 at the lower end of the inner packing ring 42 has been damaged. At this time, the entire packing body 4 needs to be replaced. It can be determined that the part of the packing body 4 that needs to be replaced can avoid unnecessary waste, reduce costs, and the method of replacing the packing body 4 is simpler and more convenient.

[0040] like Figure 5 , Figure 6 , Fig. 9 and Fig.10 As shown, an annular sliding cavity 21 is provided inside the inner valve top 2, and an alarm component 5 used in conjunction with the packing body 4 is arranged inside the annular sliding cavity 21. The alarm component 5 includes a slider 52 slidably arranged inside the annular sliding cavity 21. A slot 22 is provided on the inner wall of the inner valve top 2. The annular sliding cavity 21 is connected with the stuffing box 3 through the slot 22. A top block 51 is arranged in the slot 22. The top block 51 is used in conjunction with the slider 52. A first thrust spring 53 is fixedly arranged on the top of the top block 51. The top of the first thrust spring 53 is fixedly connected to the inner wall of the annular sliding cavity 21. The top of the top block 51 is also fixedly connected to a long rod 54.

[0041] The long rod 54 passes through the inner valve top 2 from bottom to top and is fixedly connected to the alarm ring 7. The alarm ring 7 is located on the top of the inner valve top 2. The alarm ring 7 can be moved upward and out of the inner valve top 2. The top of the alarm ring 7 has three primary colors evenly distributed, which can produce a white visual effect when rotating.

[0042] A limiting groove 121 is provided inside the outer valve top 12 , and a disassembly assembly 6 is arranged in the limiting groove 121 . The disassembly assembly 6 is used in conjunction with the long rod 54 .

[0043] The friction between the outer wall of the inner valve top 2 and the inner wall of the outer valve top 12 is smaller than the friction between the packing body 4 and the valve stem 13 after deformation. The annular sliding cavity 21 has a guiding function for the slider 52 to move up and down. The top block 51 is made of polyurethane.

[0044] The slider 52 is tilted at one end close to the top block 51, the top of the top block 51 is fixedly connected to the inner wall of the slot 22, the bottom of the top block 51 is movably connected to the inner wall of the slot 22, the bottom of the top block 51 is protruding, and the protruding part of the top block 51 is tilted.

[0045] The disassembly and assembly component 6 includes a first limit plate 61 slidably set in the limit groove 121, a rectangular groove 23 is opened inside the inner valve top 2, the rectangular groove 23 is located above the annular sliding cavity 21, and a second limit plate 62 is slidably set in the rectangular groove 23. The second limit plate 62 is fixedly connected to the long rod 54, and a contraction groove 621 is opened inside the second limit plate 62. The first limit plate 61 can slide into the contraction groove 621, and the inner wall of the contraction groove 621 is fixedly connected to the second thrust spring 63. The first limit plate 61 is slidably set in the contraction groove 621 through the second thrust spring 63, and the first limit plate 61 is designed with a rounded corner on one side close to the inner wall of the limit groove 121.

[0046] When water flows through the flow channel 422 into the annular groove 411 and the expansion groove 421, the water-absorbing expansion material expands. At this time, the outer packing ring 41 at the lower end expands and squeezes the top block 51. Since the top of the top block 51 is fixed on the inner wall of the notch 22, the bottom of the top block 51 is movable. At this time, the lower end of the top block 51 moves close to the slider 52 under the action of the expanded outer packing ring 41, and the protruding and inclined portion of the bottom of the top block 51 contacts the inclined portion of the bottom of the slider 52. The slider 52 moves upward under the action of the top block 51, and the long rod 54 also moves upward with the top block 51, so that the alarm ring 7 also moves upward away from the inner valve top 2 at the same time;

[0047] When the long rod 54 moves upward, it will simultaneously move the second limit plate 62 upward in the rectangular groove 23. When the second limit plate 62 moves upward, the first limit plate 61 is moved upward by the second limit plate 62. Due to the rounded corner design of the first limit plate 61, it will shrink to the shrinkage groove 621 under the action of the limit groove 121. At this time, if the valve stem 13 is rotated again, the valve stem 13 will rotate with the entire inner valve top 2, and the alarm ring 7 will also rotate. Due to the design of the top color of the alarm ring 7, when the alarm ring 7 rotates, the top color will turn white in the eyes of the observer, which plays a reminder role and can promptly remind the staff of the leakage of the valve stem 13 and the stuffing box 3, so as to avoid the leakage of the valve stem 13 and the stuffing box 3 for too long, and the temporary sealing effect of the stuffing body 4 disappears, resulting in the waste of water.

[0048] It should be noted that: the valve stem 13 and the valve cover 15 are fixedly connected by screw thread connection, and can be fixedly connected by screws by opening a threaded hole at the center of the valve cover 15 and the valve stem 13. Due to the principle of color retention, and the color after the fusion of the three primary colors is white, the alarm ring 7 rotates, and the top color is white in the eyes of the observer. Even if the rotation speed is too slow, the top color of the alarm ring 7 is not white, it can still be judged whether the alarm component 5 is working by whether the alarm ring 7 extends from the inner valve top 2. At the same time, the colored alarm ring 7 can make it more convenient for the staff to observe the rotation of the alarm ring 7;

[0049] When the alarm assembly 5 starts to work and the alarm ring 7 moves up from the inner valve top 2, the valve cover 15 can be removed from the valve stem 13, and then the alarm ring 7 can be pulled upward with both hands. Since the first limit plate 61 has shrunk into the shrinkage groove 621 at this time, the second limit plate 62 is fixed relative to the rectangular groove 23, and the inner valve top 2 will move up and out of the outer valve top 12 together with the alarm ring 7. At this time, the entire inner valve top 2 can be removed, and then the packing body 4 in the inner valve top 2 can be picked out and observed with the fingers to determine the part that needs to be replaced, and the disassembly action can be completed. The disassembly method is simple and convenient, and can solve the problem of water leakage at the valve stem 13 and the stuffing box 3 in a very short time.

[0050] Instructions for use: The ball valve body 1 is used for a long time, and the material inside the stuffing box 3 ages and shrinks. At the same time, the valve seat 16 is worn for a long time, resulting in the water flow inside the valve body 11 passing through the gap between the valve seat 16 and the valve body 11 and entering the stuffing box 3. First, the water flow will contact the stuffing body 4 in the stuffing box 3, and enter the expansion groove 421 through the flow channel 422 on the outer stuffing ring 41 and fill the expansion groove 421, until the water flow contacts the material in the annular groove 411 and begins to absorb moisture. The polymer water-absorbing material will quickly absorb the moisture in the annular groove 411 and the expansion groove 421, and then expand and squeeze the inner and outer walls of the outer stuffing ring 41 and the inner stuffing ring 42, thereby increasing the pressure between the inner walls of the inner stuffing ring 42 and the outer stuffing ring 41 and the outer surface of the valve stem 13, and the pressure between the outer walls of the outer stuffing ring 41 and the inner stuffing ring 42 and the inner wall of the inner valve top 2 will also increase, so that the aged and shrunk stuffing body 4 can play a sealing role again. Even if the ball valve leaks, it can continue to be used for a period of time, avoiding waste of resources, and having enough time for the staff to report and carry out maintenance.

[0051] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A large exhaust diameter ball valve, the ball valve body (1) comprises a valve body (11), an outer valve top (12) is fixedly mounted on the top of the valve body (11), a valve core (14) is rotatably arranged inside the valve body (11), a valve seat (16) is fixedly sleeved on the outer surface of the valve core (14), the outer surface of the valve core (14) is fixedly connected to a valve stem (13), the top of the valve stem (13) passes through the outer valve top (12) and is fixedly connected to a valve cover (15), characterized in that: The inner wall of the outer valve top (12) is fixedly sleeved with an inner valve top (2), the valve stem (13) is rotatably sleeved on the inner wall of the inner valve top (2), and a stuffing box (3) is provided on the inner wall of the inner valve top (2); A packing body (4) is fixedly installed in the packing box (3), and the packing body (4) is used to prevent fluid from leaking through the valve stem (13). The packing body (4) includes an outer packing ring (41) fixedly installed on the inner wall of the packing box (3), and an inner packing ring (42) is fixedly connected to the outer packing ring (41). The inner packing ring (42) can expand after absorbing water inside, and the outer packing ring (41) and the inner packing ring (42) are used in combination.

2. A large exhaust diameter ball valve according to claim 1, characterized in that: The inner packing ring (42) is provided with an annular groove (411) filled with a polymer water-absorbing expansion material. The outer packing ring (41) is provided with an expansion groove (421) at one end close to the inner packing ring (42). The expansion groove (421) is the same size as the annular groove (411) and is interconnected. The inner wall and the outer wall of the outer packing ring (41) are fixedly connected to the inner wall and the outer wall of the inner packing ring (42). The inner wall and the outer wall of the outer packing ring (41) at one end close to the inner packing ring (42) are provided with a plurality of flow channels (422).

3. A large exhaust diameter ball valve according to claim 2, characterized in that: The inner wall and the outer wall of the outer packing ring (41) can seal the flow channel (422) after being squeezed by the internal material of the expansion groove (421). The material of the outer packing ring (41) and the inner packing ring (42) is PTFE.

4. A large exhaust diameter ball valve according to claim 3, characterized in that: Two outer packing rings (41) are provided and are symmetrically arranged in an upper and lower manner. The annular grooves (411) are respectively located at the upper and lower ends of the inner packing ring (42). An inner packing ring (42) is fixedly connected between the two outer packing rings (41).

5. A large exhaust diameter ball valve according to claim 4, characterized in that: The outer packing ring (41) separates the inner wall and the outer wall into a plurality of groups of protrusions through a plurality of groups of flow channels (422); a plurality of groups of positioning blocks (423) are fixedly installed on the outer surface of one end of the outer packing ring (41) close to the inner packing ring (42); a plurality of groups of positioning grooves (412) are symmetrically provided at both upper and lower ends of the inner packing ring (42); each group of positioning grooves (412) is used in conjunction with a positioning block (423); and the number of the positioning blocks (423) may be the same as the number of the protrusions.

6. A large exhaust diameter ball valve according to claim 5, characterized in that: An annular sliding cavity (21) is provided inside the inner valve top (2), and an alarm component (5) used in conjunction with a packing body (4) is arranged inside the annular sliding cavity (21). The alarm component (5) comprises a slider (52) slidably arranged inside the annular sliding cavity (21). A notch (22) is provided on the inner wall of the inner valve top (2), and the annular sliding cavity (21) is connected to the packing box (3) through the notch (22). A top block (51) is arranged in the notch (22), and the top block (51) is used in conjunction with the slider (52). A first thrust spring (53) is fixedly arranged on the top of the top block (51), and the top of the first thrust spring (53) is fixedly connected to the inner wall of the annular sliding cavity (21). The top of the top block (51) is also fixedly connected to a long rod (54).

7. A large exhaust diameter ball valve according to claim 6, characterized in that: The long rod (54) passes through the inner valve top (2) from bottom to top and is fixedly connected to the alarm ring (7). The alarm ring (7) is located on the top of the inner valve top (2). The alarm ring (7) can be moved upward and out of the inner valve top (2). The top of the alarm ring (7) is evenly distributed with three primary colors, which can produce a white visual effect when rotating.

8. A large exhaust diameter ball valve according to claim 7, characterized in that: A limiting groove (121) is provided inside the outer valve top (12), a disassembly assembly (6) is provided in the limiting groove (121), the disassembly assembly (6) is used in conjunction with the long rod (54), the disassembly assembly (6) comprises a first limiting plate (61) slidably provided in the limiting groove (121), a rectangular groove (23) is provided inside the inner valve top (2), the rectangular groove (23) is located above the annular sliding cavity (21), a second limiting plate (62) is slidably provided in the rectangular groove (23) ), the second limit plate (62) is fixedly connected to the long rod (54), a contraction groove (621) is provided inside the second limit plate (62), the first limit plate (61) can slide into the contraction groove (621), the inner wall of the contraction groove (621) is fixedly connected to the second thrust spring (63), the first limit plate (61) is slidably arranged in the contraction groove (621) through the second thrust spring (63), and the first limit plate (61) is designed with a rounded corner on one side close to the inner wall of the limit groove (121).

9. A large exhaust diameter ball valve according to claim 8, characterized in that: The friction force between the outer wall of the inner valve top (2) and the inner wall of the outer valve top (12) is smaller than the friction force between the deformed packing body (4) and the valve stem (13); the annular sliding cavity (21) has a guiding function for the upward and downward movement of the slider (52); and the top block (51) is made of polyurethane.

10. A large exhaust diameter ball valve according to claim 9, characterized in that: The sliding block (52) is tilted at one end close to the top block (51); the top of the top block (51) is fixedly connected to the inner wall of the slot (22); the bottom of the top block (51) is movably connected to the inner wall of the slot (22); the bottom of the top block (51) is protruding, and the protruding portion of the top block (51) is tilted.

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