A large-diameter emergency shut-off valve

Abstract

The present invention belongs to the field of valve technology and provides a large-caliber emergency shut-off valve, comprising a middle body and two groups of side bodies, wherein the two groups of side bodies are distributed on both sides of the middle body and are coaxially connected to the middle body, a valve stem is rotatably mounted on the side wall of the middle body, the valve stem is distributed along the radial direction of the middle body and passes through the side wall of the middle body, a sphere with a through hole in the middle is fixedly mounted on one end of the valve stem located in the middle body, the center of the sphere is located at the intersection of the middle body and the axis of the valve stem, a valve seat is provided at one end connected to the middle body, and the valve seat and the sphere are used in conjunction. Compared with the prior art, the beneficial effects of the present invention are as follows: when the liquid flows, it drives the cleaning strip to rotate, and the impurities on the surface of the sphere are scraped and cleaned by the first mounting ring and the cleaning strip, thereby cleaning the impurities on the surface of the sphere, ensuring that the surface of the sphere that is about to contact the valve seat can be cleaned, and ensuring the smoothness of the surface of the sphere when it contacts the valve seat.

Description

Technical Field

[0001] The invention belongs to the technical field of valves, and in particular relates to a large-caliber emergency shut-off valve. Background Art

[0002] In industrial production and fluid delivery systems, emergency shut-off valves play a vital role. When an emergency occurs, it is necessary to be able to quickly and reliably cut off the flow of fluid to prevent the occurrence and expansion of accidents.

[0003] There are many types of emergency shut-off valves on the market, but there are still some shortcomings in large-caliber application scenarios. The seals in existing valves mostly use hard seals between the ball and the valve seat and use springs to compress the sealing surface between the ball and the valve seat. During use, small particles of impurities will be carried in the liquid, and the liquid is always in contact with the surface of the ball. Therefore, the impurities carried in the liquid may adhere to the surface of the ball and enter the contact surface between the ball and the valve seat. When the ball rotates, the impurities will cause the contact surface between the ball and the valve seat to wear more severely, thereby reducing the sealing effect of the valve. Summary of the Invention

[0004] The purpose of the present invention is to provide a large-caliber emergency shut-off valve, aiming to solve the technical problem in the prior art that impurities enter the contact surface between the ball and the valve seat, resulting in a decrease in the sealing effect of the valve.

[0005] The present invention is achieved in this way: a large-caliber emergency shut-off valve comprises a middle body and two groups of side bodies, the two groups of side bodies are distributed on both sides of the middle body and the side bodies are coaxially connected to the middle body, a valve stem is rotatably mounted on the side wall of the middle body, the valve stem is distributed along the radial direction of the middle body and passes through the side wall of the middle body, one end of the valve stem located in the middle body is fixedly mounted with a sphere with a through hole in the middle, the center of the sphere is located at the intersection of the middle body and the axis of the valve stem, a valve seat is provided at one end where the side body is connected to the middle body, the valve seat and the sphere are used in conjunction, a first mounting ring is rotatably mounted in the valve seat, one end face of the first mounting ring is in contact with the surface of the sphere, a driving blade is fixedly mounted on the first mounting ring, an adapter sleeve is fixedly mounted on the outer side surface of the middle body, the valve stem is located in the adapter sleeve, and an execution module for driving the valve stem to rotate is provided at the end of the adapter sleeve away from the middle body.

[0006] Further technical solution: A bottom plate is provided in the middle of the middle body, a fixed shaft is fixedly installed on the bottom plate, the fixed shaft is coaxially arranged with the valve stem, the fixed shaft extends into the middle body and is rotatably connected to the ball.

[0007] Further technical solution: the valve seat is an annular structure and is coaxially arranged with the side body, and when the side body and the middle body are connected, the valve seat contacts the surface of the sphere.

[0008] Further technical solution: Multiple groups of cleaning strips are fixedly installed in the first mounting ring. The cleaning strips are arc-shaped and fit the surface of the sphere. The multiple groups of cleaning strips are distributed in a circular array around the axis of the first mounting ring.

[0009] Further technical solution: The drive blades are provided in multiple groups and are distributed in a circular array around the axis of the first mounting ring. A coaxially distributed connecting rod is provided in the middle of the first mounting ring. The connecting rod is fixedly connected to multiple groups of cleaning strips and drive blades, and the end of the connecting rod away from the sphere is a conical structure.

[0010] Further technical solution: A third rotating shaft is rotatably installed in the middle body, the axis of the third rotating shaft is parallel to the straight line of the middle body, the third rotating shaft is close to the side wall of the middle body, and the third rotating shaft is rotatably connected to the first mounting rings on both sides.

[0011] Further technical solution: A groove is provided on the inner side surface of the side body, and a first rotating shaft is rotatably installed in the groove. The first rotating shaft is distributed along the radial direction of the side body, and a first bevel gear is fixedly installed on the end of the first rotating shaft. The first bevel gear is engaged with a bevel gear ring fixedly installed on the first mounting ring. The bevel gear ring and the first mounting ring are coaxially arranged, and the first rotating shaft is rotatably connected to the third rotating shaft.

[0012] Further technical solution: The end face of the side body located in the middle body is rotatably installed with a second rotating shaft, the second rotating shaft is parallel to the third rotating shaft and the second rotating shaft extends into the groove, the second rotating shaft and the first rotating shaft are distributed in the same plane, and the end of the second rotating shaft located in the groove is fixedly installed with a third bevel gear, the third bevel gear is meshed with the second bevel gear fixedly installed on the first rotating shaft, and the end of the second rotating shaft away from the first rotating shaft is fixedly installed with a first transmission gear, the first transmission gear is meshed with the second transmission gear fixedly installed on the third rotating shaft.

[0013] Further technical solution: A second mounting ring is rotatably mounted on the valve seat, the second mounting ring is coaxially arranged with the valve seat, the second mounting ring is located in the space surrounded by the middle body, the valve seat, the side body and the sphere, a cleaning ring is fixedly mounted on the second mounting ring, the cleaning ring contacts the surface of the sphere, a transmission gear ring is fixedly mounted on the second mounting ring, and the transmission gear ring is engaged with the first transmission gear.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. After the ball is turned on, the liquid will push the first mounting ring to rotate through the driving blades when it flows, and the first mounting ring will drive the cleaning strip to rotate when it rotates. When the ball is stationary, the first mounting ring and the cleaning strip will rub against the surface of the ball when they rotate, thereby scraping off the impurities adhering to the surface of the ball. The scraped impurities can be discharged with the movement of the liquid. At the same time, when the ball, the first mounting ring and the cleaning strip rotate at the same time, their rotation direction is different from the rotation direction of the first mounting ring and the cleaning strip. The impurities on the surface of the ball will not only be affected by the force along the rotation direction of the ball, but also by the force in the rotation direction of the first mounting ring and the cleaning strip. Under the action of forces in different directions, the cleaning efficiency of impurities on the surface of the ball is further improved. As a result, when the first mounting ring does not rotate, the impurities on the surface of the sphere are actively cleaned, thereby reducing the accumulation of impurities on the surface of the sphere. When the sphere rotates, the surface of the sphere can also move relative to the first mounting ring and the cleaning strip. The first mounting ring and the cleaning strip can also scrape and clean the impurities on the surface of the sphere, thereby realizing passive cleaning of impurities on the surface of the sphere, ensuring that the surface of the sphere that is about to contact the valve seat can be cleaned, ensuring the smoothness of the sphere surface when in contact with the valve seat, avoiding impurities on the contact surface between the sphere and the valve seat and causing wear, and the first mounting ring can block the side of the contact surface between the sphere and the valve seat, reducing the probability of impurities approaching the contact surface between the sphere and the valve seat, thereby ensuring the sealing effect of the valve.

[0016] 2. The first mounting rings in the side bodies on both sides are connected through the third rotating shaft, so that the first mounting rings on both sides of the middle body can rotate synchronously, avoiding the first mounting rings on the side from being unable to rotate stably when the water flow is relatively small, and realizing continuous and active cleaning of the surfaces on both sides of the sphere during the water flow process, further improving the cleaning effect of the sphere.

[0017] 3. When the second shaft rotates, the second mounting ring is driven to rotate through the meshing transmission gear ring and the first transmission gear. The cleaning ring can continuously clean the surface of the ball close to the valve seat. The cleaning ring cooperates with the first mounting ring to ensure that the surface of the ball in contact with the valve seat is cleaned during subsequent rotation, further reducing the wear of the ball and the valve seat and improving the sealing effect of the valve. At the same time, the cleaning ring can also block the other side of the contact surface between the ball and the valve seat, reducing the probability of impurities approaching the contact surface between the ball and the valve seat, thereby ensuring the sealing effect of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is a schematic diagram of the explosion structure of the present invention.

[0020] Figure 3 Schematic diagram of the explosion structure of the valve seat in the present invention.

[0021] Figure 4 It is a schematic diagram of the first plane cross-sectional structure in the present invention.

[0022] Figure 5 for Figure 4 Schematic diagram of the enlarged A1 region.

[0023] Figure 6 It is a schematic cross-sectional structural diagram of the second plane in the present invention.

[0024] Figure 7 for Figure 6 A magnified schematic diagram of the A2 region in the middle.

[0025] In the accompanying drawings: 1. middle body; 2. adapter sleeve; 3. execution module; 4. ball; 5. valve stem; 6. bottom plate; 7. fixed shaft; 8. side body; 9. valve seat; 10. first mounting ring; 11. conical gear ring; 12. cleaning strip; 13. drive blade; 14. second mounting ring; 15. cleaning ring; 16. transmission gear ring; 17. groove; 18. first rotating shaft; 19. first bevel gear; 20. second bevel gear; 21. third bevel gear; 22. second rotating shaft; 23. first transmission gear; 24. third rotating shaft; 25. second transmission gear. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0028] like Figure 1-Figure 7The figure shows a large-caliber emergency shut-off valve provided by the present invention, comprising a middle body 1 and two groups of side bodies 8. The two groups of side bodies 8 are distributed on both sides of the middle body 1 and the side bodies 8 are coaxially connected to the middle body 1. The side bodies 8 are fixedly connected to the middle body 1 by multiple groups of fixing screws. A valve stem 5 is rotatably installed on the side wall of the middle body 1. The valve stem 5 is distributed along the radial direction of the middle body 1 and passes through the side wall of the middle body 1. One end of the valve stem 5 located in the middle body 1 is fixedly installed with a ball 4 with a through hole in the middle. The center of the ball 4 is located at the intersection of the axes of the middle body 1 and the valve stem 5. A bottom plate 6 is provided in the middle of the middle body 1. A fixed shaft 7 is fixedly installed on the bottom plate 6. The fixed shaft 7 is coaxially arranged with the valve stem 5. The fixed shaft 7 extends into the middle body 1 and is rotatably connected to the ball 4. A valve seat 9 is provided at one end of the side body 8 connected to the middle body 1. The valve seat 9 cooperates with the ball 4. The valve seat 9 is an annular structure and is coaxially arranged with the side body 8. The side body 8 is completely connected to the middle body 1. When the valve seat 9 is formed, it contacts the surface of the ball 4. A first mounting ring 10 is rotatably installed in the valve seat 9. One end face of the first mounting ring 10 contacts the surface of the ball 4. A driving blade 13 is fixedly installed on the first mounting ring 10. Multiple groups of cleaning strips 12 are fixedly installed in the first mounting ring 10. The cleaning strips 12 are arc-shaped and fit the surface of the ball 4. The multiple groups of cleaning strips 12 are distributed in a circular array around the axis of the first mounting ring 10. There are multiple groups of driving blades 13 and they are distributed in a circular array around the axis of the first mounting ring 10. A coaxially distributed connecting rod is provided in the middle of the first mounting ring 10. The connecting rod is fixedly connected to the multiple groups of cleaning strips 12 and the driving blades 13. The end of the connecting rod away from the ball 4 is a conical structure. An adapter sleeve 2 is fixedly installed on the outer side of the middle body 1. The valve stem 5 is located in the adapter sleeve 2. The end of the adapter sleeve 2 away from the middle body 1 is provided with an execution module 3 that drives the valve stem 5 to rotate.

[0029] In actual application, this embodiment is connected to the water pipe through the side bodies 8 at both ends. When the valve needs to be opened, the valve stem 5 is driven to rotate by the actuator module 3, and the valve stem 5 drives the ball 4 to rotate, so that the through hole on the ball 4 is gradually connected to the side bodies 8. The water flow through the valve is adjusted by controlling the rotation angle of the valve stem 5. When the ball 4 rotates, its surface can slide with the valve seat 9. When the pipeline connection needs to be cut off, the valve stem 5 is driven to rotate in the opposite direction by the actuator module 3 until the surface of the ball 4 closes the valve seat 9. At this time, the pipeline connection is completely cut off. A hard seal is used between the ball 4 and the valve seat 9, and a spring is used to compress the sealing surface between the ball 4 and the valve seat 9. A combination of soft and hard seals is used between the valve seat 9 and the middle body 1, which can effectively prevent fluid leakage.

[0030] When the through hole of the sphere 4 is in a connected state with the side body 8, water flows from the side body 8 and the middle body 1. When the water flows into the first group of side bodies 8, due to the pressure in the pipeline and the setting of the rear side sphere 4, the first group of side bodies 8 is filled with liquid and the liquid has a large pressure. When the sphere 4 is rotated and opened, the liquid in the first group of side bodies 8 will flow rapidly under the action of pressure, and then the liquid will push the first mounting ring 10 to rotate through the driving blades 13 when it flows. When the first mounting ring 10 rotates, it drives the cleaning strip 12 to rotate. When the sphere 4 is stationary, the first mounting ring 10 and the cleaning strip 12 rotate and rub against the surface of the sphere 4, thereby scraping off impurities adhering to the surface of the sphere 4. The scraped impurities can be discharged with the movement of the liquid. At the same time, when the sphere 4, the first mounting ring 10, and the cleaning strip 12 rotate at the same time, their rotation direction is different from the rotation direction of the first mounting ring 10 and the cleaning strip 12. The impurities on the surface of the sphere 4 will not only be affected by the rotation direction along the rotation direction of the sphere 4 The force will also be affected by the force in the rotation direction of the first mounting ring 10 and the cleaning strip 12, which further improves the cleaning effect of impurities on the surface of the ball 4 under the action of forces in different directions. When the first mounting ring 10 does not rotate, the impurities on the surface of the ball 4 are actively cleaned, thereby reducing the accumulation of impurities on the surface of the ball 4. When the ball 4 rotates, the surface of the ball 4 can also move relative to the first mounting ring 10 and the cleaning strip 12. The first mounting ring 10 and the cleaning strip 12 can also scrape and clean the impurities on the surface of the ball 4, thereby passively cleaning the impurities on the surface of the ball 4, ensuring that the surface of the ball 4 that is about to contact the valve seat 9 can be cleaned, ensuring the smoothness of the surface of the ball 4 when in contact with the valve seat 9, avoiding impurities on the contact surface of the ball 4 and the valve seat 9 causing wear, and the first mounting ring 10 can block the side of the contact surface between the ball 4 and the valve seat 9, reducing the probability of impurities approaching the contact surface between the ball 4 and the valve seat 9, thereby ensuring the sealing effect of the valve;

[0031] When water flows through the middle body 1 and into the other set of side bodies 8 , the driving blades 13 drive the first mounting ring 10 to rotate, thereby cleaning the other side of the sphere 4 and ensuring the cleaning effect of the sphere 4 .

[0032] In one example of this embodiment, the execution module 3 can drive the valve stem 5 to rotate through a cylinder and a shift fork. Of course, it can also be an electric telescopic rod, a hydraulic cylinder and a shift fork, or other structures that can drive the valve stem 5 to rotate.

[0033] like Figure 4-Figure 7 As shown, a large-caliber emergency shut-off valve provided by the present invention has a third rotating shaft 24 rotatably installed in the middle body 1. The axis of the third rotating shaft 24 is parallel to the straight line of the middle body 1. The third rotating shaft 24 is close to the side wall of the middle body 1. The third rotating shaft 24 is rotatably connected to the first mounting rings 10 on both sides.

[0034] Specifically, a groove 17 is provided on the inner side surface of the side body 8, and a first rotating shaft 18 is rotatably installed in the groove 17. The first rotating shaft 18 is distributed along the radial direction of the side body 8. A first bevel gear 19 is fixedly installed on the end of the first rotating shaft 18. The first bevel gear 19 is engaged with a bevel gear ring 11 fixedly installed on the first mounting ring 10. The bevel gear ring 11 and the first mounting ring 10 are coaxially arranged, and the first rotating shaft 18 is rotatably connected to the third rotating shaft 24.

[0035] Specifically, the end surface of the side body 8 located in the middle body 1 is rotatably installed with a second rotating shaft 22, the second rotating shaft 22 is parallel to the third rotating shaft 24 and the second rotating shaft 22 extends into the groove 17, the second rotating shaft 22 and the first rotating shaft 18 are distributed in the same plane, and the end of the second rotating shaft 22 located in the groove 17 is fixedly installed with a third bevel gear 21, the third bevel gear 21 is meshed with the second bevel gear 20 fixedly mounted on the first rotating shaft 18, and the end of the second rotating shaft 22 away from the first rotating shaft 18 is fixedly installed with a first transmission gear 23, and the first transmission gear 23 is meshed with the second transmission gear 25 fixedly mounted on the third rotating shaft 24.

[0036] In actual application of this embodiment, when the first mounting ring 10 rotates, the first rotating shaft 18 is driven to rotate through the meshing bevel gear ring 11 and the first bevel gear 19. The first rotating shaft 18 drives the second rotating shaft 22 to rotate synchronously through the meshing second bevel gear 20 and the third bevel gear 21. The second rotating shaft 22 drives the third rotating shaft 24 to rotate synchronously through the meshing first transmission gear 23 and the second transmission gear 25. The third rotating shaft 24 drives the first mounting ring 10 in the other group of side bodies 8 to rotate synchronously through the same structure on the other group of side bodies 8, so that the first mounting rings 10 on both sides of the middle body 1 can rotate synchronously, avoiding the first mounting ring 10 on the side from being unable to rotate stably when the water flow rate is relatively small, and realizing continuous and active cleaning of the surfaces on both sides of the ball 4 during the water flow process, further improving the cleaning effect of the ball 4.

[0037] like Figure 2-Figure 7 As shown, a large-caliber emergency shut-off valve provided by the present invention has a second mounting ring 14 rotatably mounted on the valve seat 9. The second mounting ring 14 is coaxially arranged with the valve seat 9 and is located in a space enclosed by the middle body 1, the valve seat 9, the side body 8 and the spherical body 4. A cleaning ring 15 is fixedly mounted on the second mounting ring 14, and the cleaning ring 15 contacts the surface of the spherical body 4. A transmission ring gear 16 is fixedly mounted on the second mounting ring 14, and the transmission ring gear 16 meshes with the first transmission gear 23.

[0038] In actual application of this embodiment, when the second rotating shaft 22 rotates, the second mounting ring 14 is driven to rotate through the meshing transmission ring 16 and the first transmission gear 23. When the second mounting ring 14 rotates, the cleaning ring 15 is driven to rotate. When the cleaning ring 15 rotates, it slides with the surface of the ball 4, so that the cleaning ring 15 can continuously clean the surface of the ball 4 close to the valve seat 9. The cleaning ring 15 cooperates with the first mounting ring 10 to ensure that the surface of the ball 4 in contact with the valve seat 9 is cleaned when the ball 4 rotates subsequently, further reducing the wear of the ball 4 and the valve seat 9 and improving the sealing effect of the valve. At the same time, the cleaning ring 15 can also block the other side of the contact surface between the ball 4 and the valve seat 9, reducing the probability of impurities approaching the contact surface between the ball 4 and the valve seat 9, thereby ensuring the sealing effect of the valve.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0040] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A large-caliber emergency shut-off valve, comprising a middle body (1) and two sets of side bodies (8), characterized in that: The two groups of side bodies (8) are distributed on both sides of the middle body (1) and the side bodies (8) are coaxially connected to the middle body (1). A valve stem (5) is rotatably installed on the side wall of the middle body (1). The valve stem (5) is distributed along the radial direction of the middle body (1) and penetrates the side wall of the middle body (1). One end of the valve stem (5) located in the middle body (1) is fixedly installed with a sphere (4) with a through hole in the middle. The center of the sphere (4) is located at the intersection of the axis of the middle body (1) and the valve stem (5). The end of the side body (8) connected to the middle body (1) is provided with a A valve seat (9) is provided, the valve seat (9) is used in conjunction with the sphere (4), a first mounting ring (10) is rotatably mounted in the valve seat (9), one end face of the first mounting ring (10) contacts the surface of the sphere (4), a driving blade (13) is fixedly mounted on the first mounting ring (10), an adapter sleeve (2) is fixedly mounted on the outer side of the middle body (1), the valve stem (5) is located in the adapter sleeve (2), and an execution module (3) for driving the valve stem (5) to rotate is provided at one end of the adapter sleeve (2) away from the middle body (1).

2. A large-diameter emergency shut-off valve according to claim 1, characterized in that: A bottom plate (6) is provided in the middle of the middle body (1), and a fixed shaft (7) is fixedly installed on the bottom plate (6). The fixed shaft (7) and the valve stem (5) are coaxially arranged, and the fixed shaft (7) extends into the middle body (1) and is rotatably connected to the ball (4).

3. A large-diameter emergency shut-off valve according to claim 1, characterized in that: The valve seat (9) is an annular structure and is coaxially arranged with the side body (8). When the side body (8) and the middle body (1) are connected, the valve seat (9) contacts the surface of the ball (4).

4. A large-diameter emergency shut-off valve according to claim 1, characterized in that: A plurality of cleaning strips (12) are fixedly installed in the first mounting ring (10). The cleaning strips (12) are arc-shaped and fit the surface of the sphere (4). The plurality of cleaning strips (12) are distributed in a circular array around the axis of the first mounting ring (10).

5. A large-diameter emergency shut-off valve according to claim 1, characterized in that: The driving blades (13) are provided in multiple groups and are distributed in a circumferential array around the axis of the first mounting ring (10). A coaxially distributed connecting rod is provided in the middle of the first mounting ring (10). The connecting rod is fixedly connected to the multiple groups of cleaning strips (12) and the driving blades (13). The end of the connecting rod away from the sphere (4) is a conical structure.

6. A large-diameter emergency shut-off valve according to claim 5, characterized in that: A third rotating shaft (24) is rotatably mounted in the middle body (1), the axis of the third rotating shaft (24) being parallel to the straight line of the middle body (1), the third rotating shaft (24) being close to the side wall of the middle body (1), and the third rotating shaft (24) being rotatably connected to the first mounting rings (10) on both sides.

7. A large-diameter emergency shut-off valve according to claim 6, characterized in that: A groove (17) is provided on the inner side surface of the side body (8), and a first rotating shaft (18) is rotatably installed in the groove (17). The first rotating shaft (18) is distributed along the radial direction of the side body (8). A first bevel gear (19) is fixedly installed at the end of the first rotating shaft (18). The first bevel gear (19) is engaged with a bevel gear ring (11) fixedly installed on the first mounting ring (10). The bevel gear ring (11) and the first mounting ring (10) are coaxially arranged. The first rotating shaft (18) is rotatably connected to the third rotating shaft (24).

8. A large-diameter emergency shut-off valve according to claim 7, characterized in that: The end surface of the side body (8) located in the middle body (1) is rotatably mounted with a second rotating shaft (22), the second rotating shaft (22) is parallel to the third rotating shaft (24) and extends into the groove (17), the second rotating shaft (22) and the first rotating shaft (18) are distributed in the same plane, one end of the second rotating shaft (22) located in the groove (17) is fixedly mounted with a third bevel gear (21), the third bevel gear (21) is meshed with a second bevel gear (20) fixedly mounted on the first rotating shaft (18), and one end of the second rotating shaft (22) away from the first rotating shaft (18) is fixedly mounted with a first transmission gear (23), the first transmission gear (23) is meshed with a second transmission gear (25) fixedly mounted on the third rotating shaft (24).

9. A large-diameter emergency shut-off valve according to claim 8, characterized in that: A second mounting ring (14) is rotatably mounted on the valve seat (9). The second mounting ring (14) is coaxially arranged with the valve seat (9). The second mounting ring (14) is located in a space surrounded by the middle body (1), the valve seat (9), the side body (8) and the sphere (4). A cleaning ring (15) is fixedly mounted on the second mounting ring (14). The cleaning ring (15) contacts the surface of the sphere (4). A transmission gear ring (16) is fixedly mounted on the second mounting ring (14). The transmission gear ring (16) is engaged with the first transmission gear (23).

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