All-welded butterfly valve

Abstract

The invention discloses an all-welded butterfly valve and belongs to the technical field of butterfly valves, the all-welded butterfly valve comprises a butterfly valve body and an execution valve seat mounted at the upper end of the butterfly valve body, a positioning block is mounted in the middle of the lower end of the butterfly valve body, a valve plate body is mounted in the butterfly valve body, and a driving valve rod is inserted into the middle of the valve plate body; the upper end of the driving valve rod is connected with a driving component in the execution valve seat, and a sealing ring sleeve is installed in the circumferential direction of the valve plate body and used for guaranteeing the sealing performance between the valve plate body and the butterfly valve body. According to the all-welded butterfly valve, through the arrangement of the split type driving valve rod, the sealing ring sleeve in the circumferential direction of the valve plate body can be firstly deflated when the upper valve rod rotates, the fitting degree between the sealing ring sleeve and the inner wall of the valve body is reduced, the sealing rubber sleeve does not generate large-degree friction with the inner wall of the valve body when rotating, and the service life of the sealing rubber sleeve is prolonged; and the energy consumption required for opening the valve plate body is reduced.

Description

Technical Field

[0001] This invention relates to the field of butterfly valve technology, specifically to a fully welded butterfly valve. Background Technology

[0002] The butterfly valve is a key and widely used industrial fluid control device. The valve body of the butterfly valve has a disc-shaped valve disc fixed to a valve stem. By rotating the valve stem, the disc can rotate in the valve seat like butterfly wings, thereby controlling the flow of fluid.

[0003] For example, Chinese patent CN217842712U, entitled "Anti-Leakage Electric Butterfly Valve," published on November 18, 2022, includes a valve body and a valve seat centrally located at the top of the valve body. A valve stem is rotatably mounted inside the valve seat, and a handwheel is fixedly mounted at the top of the valve stem. A closing mechanism for sealing the valve body is movably mounted at one end of the valve stem extending into the valve body, and the bottom end of the valve stem is rotatably connected to the bottom end of the valve body. The closing mechanism includes a sleeve, with a through hole centrally located at the top of the sleeve for detachable installation of the valve stem. Both sides of the sleeve are constructed with butterfly plates, and both sides of the outer edge of the butterfly plates are provided with arc-shaped grooves. Arc-shaped sealing strips are fixedly bonded to both arc-shaped grooves. Arc-shaped grooves are centrally located on both sides of the inner edge of the valve body, and arc-shaped sealing strips are fixedly provided in both arc-shaped grooves.

[0004] The existing technologies mentioned above have the following technical problems: In order to ensure the sealing between the valve plate and the valve body, existing butterfly valves usually wrap a rubber sealing ring around the circumference of the valve body. However, the rubber sealing ring itself is not adjustable. Since the rubber sealing ring needs to play a sealing role, it must be tightly fitted to the valve body. After the valve plate is rotated open, the tightly fitted rubber sealing ring is prone to a large degree of friction with the valve body. With long-term use, the sealing ring is prone to rapid wear. At the same time, because the rubber sealing ring needs to be tightly fitted to the valve body, the frictional resistance between the two is large, which requires greater energy consumption when operating with manual, electric or pneumatic actuators.

[0005] Therefore, we propose a fully welded butterfly valve to solve the problems mentioned above. Summary of the Invention

[0006] The purpose of this invention is to provide a fully welded butterfly valve to solve the problem mentioned in the background art. Currently, existing butterfly valves on the market typically use a rubber sealing ring wrapped around the circumference of the valve body to ensure a tight seal between the valve plate and the valve body. However, the rubber sealing ring itself is not adjustable. Because the rubber sealing ring needs to perform a sealing function, it must be tightly fitted to the valve body. This tight fit leads to significant friction between the rubber sealing ring and the valve body after the valve plate is rotated open. Over time, this can cause rapid wear of the sealing ring. Furthermore, because the rubber sealing ring needs to be tightly fitted to the valve body, the frictional resistance between them is high, requiring greater energy consumption when operated manually, electrically, or pneumatically.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a fully welded butterfly valve, comprising a butterfly valve body and an actuator valve seat installed on the upper end of the butterfly valve body. A positioning block is installed in the middle of the lower end of the butterfly valve body. A valve plate body is installed inside the butterfly valve body. A drive valve stem is inserted into the middle of the valve plate body, and the upper end of the drive valve stem is connected to a drive component in the actuator valve seat. A sealing ring is installed circumferentially on the valve plate body. The sealing ring is used to ensure the sealing between the valve plate body and the butterfly valve body. The drive valve stem includes an upper valve stem and a lower valve stem, and the lower valve stem is fixed to the valve plate body. An inflation component is installed between the upper valve stem and the lower valve stem. The inflation component is used to control the expansion and contraction of the sealing ring.

[0008] Preferably, the valve plate body has a plurality of reinforcing ribs evenly distributed on it, the reinforcing ribs are made of steel, and the reinforcing ribs and the valve plate body are welded together.

[0009] By adopting the above technical solution and strengthening the uniform distribution of ribs on the valve plate body, the strength of the valve plate body inside the butterfly valve body can be improved.

[0010] Preferably, the upper valve stem is rotatable on the lower valve stem, and the lower end of the lower valve stem is inserted into the interior of the positioning block, allowing the lower valve stem to rotate on the positioning block.

[0011] By adopting the above technical solution, the operation of the inflation component can be controlled by the rotation of the upper valve stem on the lower valve stem.

[0012] Preferably, the inflation component includes a power block fixed to the lower end of the upper valve stem, and the power block is located in a docking groove opened at the upper end of the lower valve stem. A limit stop is fixed inside the docking groove. A movable disc is fixed to the lower end of the power block, and a transmission rod is fixed to the middle of the lower end of the movable disc. A compression block is installed on the lower side of the transmission rod, and an adjusting pressure plate is provided below the compression block. A pressure receiving block is fixed to the upper end of the adjusting pressure plate, and the adjusting pressure plate is connected to the lower valve stem through an auxiliary spring. A main rubber sleeve is provided at the lower end of the adjusting pressure plate, and the main rubber sleeve is installed on the support plate.

[0013] By adopting the above technical solution, the upper valve stem can drive the power block to rotate in the docking groove inside the lower valve stem when it rotates. After the power block contacts the limit stop in the docking groove, the rotation of the power block can drive the lower valve stem to rotate synchronously by the limit stop.

[0014] Preferably, the power block at the lower end of the upper valve stem and the limiting block in the lower valve stem docking groove are in a non-contact state in the initial state, and the movable disc at the lower end of the power block can rotate on the lower valve stem.

[0015] By adopting the above technical solution, the lower movable disc can be rotated synchronously by the rotation of the power block on the lower valve stem.

[0016] Preferably, the surface contours of the pressing block at the lower end of the transmission rod and the pressure block above the adjusting pressure plate are both set to arc shape, and the adjusting pressure plate forms an elastic telescopic structure through an auxiliary spring and a lower valve rod.

[0017] By adopting the above technical solution, when the extrusion block rotates with the transmission rod and comes into contact with the pressure block on the adjusting pressure plate, it can extrude downward pressure on the pressure block, causing the pressure block to drive the adjusting pressure plate to move downward synchronously.

[0018] Preferably, the lower end of the adjusting pressure plate does not contact the upper surface of the main rubber sleeve in the initial state, and both the main rubber sleeve and the sealing ring sleeve are hollow structures. Both the main rubber sleeve and the sealing ring sleeve are made of elastic rubber material, and the airflow inside the main rubber sleeve can enter the interior of the sealing ring sleeve through the air supply pipe.

[0019] By adopting the above technical solution, when the adjusting pressure plate moves downward, it can squeeze the sealing ring sleeve, so that the airflow inside the sealing ring sleeve can enter the interior of the sealing ring sleeve through the air supply pipe.

[0020] Preferably, the main rubber sleeve and the support plate are fixedly connected, and the support plate can slide inside the lower valve stem. A support column is fixed at the lower end of the support plate, and an adjustment rod is inserted into the support column.

[0021] By adopting the above technical solution, the support plate at the upper end of the support column can be moved synchronously by the movement of the support column inside the lower valve stem. The movement of the support plate can be used to adjust the distance between the main rubber sleeve and the adjusting pressure plate.

[0022] Preferably, the regulating rod and the support column are threaded together, the cross-section of the support column is set to a rectangular structure, and the support column can slide on the lower valve rod, while the regulating rod can rotate on the lower valve rod.

[0023] By adopting the above technical solution, when the control rod rotates, the threaded support column can move, and the support column with a rectangular cross-section can avoid rotating synchronously with the control rod.

[0024] Compared with the prior art, the beneficial effects of the present invention are: the fully welded butterfly valve, through the separate drive valve stem, can first de-air the sealing ring of the valve plate body in the circumferential direction when the upper valve stem rotates, reduce the fit between the sealing ring and the inner wall of the valve body, so that the sealing sleeve will not generate a large degree of friction with the inner wall of the valve body when rotating, improve the service life of the sealing sleeve, and reduce the energy consumption required to open the valve plate body. 1. Meanwhile, the butterfly plate is made of high-quality steel by welding, which is strong and lightweight. The butterfly valve body is also made by welding, which reduces the cost by half compared to the casting process. 2. The rotation of the power block can drive the movable disc to rotate synchronously. By disengaging the pressing block at the lower end of the transmission rod from the pressing block above the adjusting pressure plate, the adjusting pressure plate can release the pressure on the main rubber sleeve. At this time, the airflow inside the sealing ring sleeve flows back to the inside of the main rubber sleeve through the air supply pipe, causing the sealing ring sleeve to de-air and contract. This reduces the friction between the sealing ring sleeve and the inner wall of the valve body after the valve plate body rotates. In addition, the contracted sealing ring sleeve can also reduce the resistance between the valve plate body and the inner wall of the valve body when rotating. 3. By adjusting the rotation of the insertion rod, the threaded support column can move inside the lower valve stem. After the support column moves, it can drive the support plate and the main rubber sleeve to move synchronously, thereby adjusting the distance between the main rubber sleeve and the pressure block. This changes the compression deformation of the main rubber sleeve by the adjusting pressure plate, controls the air volume of the sealing sleeve, and achieves the purpose of adjusting the expansion size of the sealing sleeve. Attached Figure Description

[0025] Figure 1 This is a frontal perspective view of the present invention; Figure 2 This is a schematic diagram of the valve seat and valve plate body structure of the present invention; Figure 3 This is a schematic diagram of the valve plate body and reinforcing ribs of the present invention; Figure 4This is a schematic diagram of the valve plate body and sealing ring structure of the present invention; Figure 5 This is a schematic diagram of the sealing ring and gas pipeline structure of the present invention; Figure 6 This is a schematic diagram of the power block and limiting stop block structure of the present invention; Figure 7 This is a schematic diagram of the main rubber sleeve and support plate structure of the present invention; Figure 8 This is a schematic diagram of the extrusion block and the pressure-bearing block of the present invention; Figure 9 For the present invention Figure 7 Enlarged structural diagram at point A in the middle.

[0026] In the diagram: 1. Butterfly valve body; 2. Actuating valve seat; 3. Positioning block; 4. Valve plate body; 5. Drive valve stem; 501. Upper valve stem; 502. Lower valve stem; 6. Sealing ring sleeve; 7. Power block; 8. Connecting groove; 9. Limit stop block; 10. Movable disc; 11. Transmission rod; 12. Extrusion block; 13. Adjusting pressure plate; 14. Pressure-bearing block; 15. Auxiliary spring; 16. Main rubber sleeve; 17. Support plate; 18. Gas supply pipe; 19. Support column; 20. Adjusting rod; 21. Reinforcing rib. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1: Please refer to Figures 1-9In existing butterfly valves, to ensure a tight seal between the valve plate and the valve body, a rubber sealing ring is typically wrapped around the circumference of the valve body. However, the rubber sealing ring itself is not adjustable. Because the rubber sealing ring needs to perform its sealing function, it must fit tightly against the valve body. This tight fit leads to significant friction between the rubber sealing ring and the valve body after the valve plate is rotated open. Over time, this causes rapid wear of the sealing ring. Furthermore, because the rubber sealing ring needs to fit tightly against the valve body, the frictional resistance between them is high, requiring greater energy consumption when operated manually, electrically, or pneumatically. To solve this technical problem, this embodiment discloses the following technical content: a fully welded butterfly valve, including a butterfly valve body. 1. An actuator valve seat 2 is installed on the upper end of the butterfly valve body 1. A positioning block 3 is installed in the middle of the lower end of the butterfly valve body 1. A valve plate body 4 is installed inside the butterfly valve body 1. A drive valve stem 5 is inserted into the middle of the valve plate body 4, and the upper end of the drive valve stem 5 is connected to the drive component in the actuator valve seat 2. A sealing ring sleeve 6 is installed circumferentially on the valve plate body 4. The sealing ring sleeve 6 is used to ensure the sealing between the valve plate body 4 and the butterfly valve body 1. The drive valve stem 5 includes an upper valve stem 501 and a lower valve stem 502, and the lower valve stem 502 is fixed to the valve plate body 4. An inflation component is installed between the upper valve stem 501 and the lower valve stem 502. The inflation component is used to control the expansion and contraction of the sealing ring sleeve 6. Multiple reinforcing ribs 21 are evenly distributed on the valve plate body 4. 1. Made of steel, with reinforcing ribs 21 and valve plate body 4 welded together. The upper valve stem 501 can rotate on the lower valve stem 502, and the lower end of the lower valve stem 502 is inserted into the positioning block 3. The lower valve stem 502 can rotate on the positioning block 3. The inflation component includes a power block 7 fixed to the lower end of the upper valve stem 501, and the power block 7 is located in the docking groove 8 opened at the upper end of the lower valve stem 502. A limit stop 9 is fixed inside the docking groove 8. A movable disc 10 is fixed to the lower end of the power block 7, and a transmission rod 11 is fixed to the middle of the lower end of the movable disc 10. A pressing block 12 is installed on the lower side of the transmission rod 11, and an adjusting pressure plate 13 is provided below the pressing block 12. A pressure receiving block 14 is fixed to the upper end of the adjusting pressure plate 13, and the adjusting pressure plate 13 is connected by... The auxiliary spring 15 and the lower valve stem 502 are interconnected. The lower end of the adjusting pressure plate 13 is provided with a main rubber sleeve 16, which is mounted on the support plate 17. The power block 7 at the lower end of the upper valve stem 501 and the limiting block 9 in the mating groove 8 of the lower valve stem 502 are in a non-contact state in the initial state. The movable disc 10 at the lower end of the power block 7 can rotate on the lower valve stem 502. The surface contours of the pressing block 12 at the lower end of the transmission rod 11 and the pressure block 14 above the adjusting pressure plate 13 are both set to arc shape. The adjusting pressure plate 13 forms an elastic telescopic structure through the auxiliary spring 15 and the lower valve stem 502. The lower end of the adjusting pressure plate 13 does not contact the upper surface of the main rubber sleeve 16 in the initial state. The interiors of the main rubber sleeve 16 and the sealing ring sleeve 6 are both set to hollow structures.Both the main rubber sleeve 16 and the sealing ring sleeve 6 are made of elastic rubber. Airflow inside the main rubber sleeve 16 can enter the interior of the sealing ring sleeve 6 through the air supply pipe 18.

[0029] When the butterfly valve body 1 needs to be used, its valve plate body 4 needs to be rotated open. Then, the upper valve stem 501 is rotated by the drive component inside the actuator valve seat 2. After the upper valve stem 501 rotates, its power block 7 rotates synchronously. At this time, the power block 7 gradually disengages from the contacting limit block 9. However, the power block 7 does not drive the lower valve stem 502 to rotate synchronously using the limit block 9. After the power block 7 rotates, it can drive the transmission rod 11 to rotate through the movable plate 10. After the transmission rod 11 rotates, the pressing block 12 on its lower side disengages from the pressure block 14 on the adjusting pressure plate 13. The adjusting pressure plate 13 resets and rebounds under the action of the auxiliary spring 15. After the adjusting pressure plate 13 resets, the compression on the main rubber sleeve 16 is released. The main rubber sleeve 16 is then... After the main rubber sleeve 16 resets, the airflow inside the sealing ring sleeve 6 can flow back to the inside of the main rubber sleeve 16 through the air supply pipe 18. At this time, the sealing ring sleeve 6 is depressurized and shrinks. After the squeezing block 12 separates from the pressure block 14 on the adjusting pressure plate 13, the power block 7 re-fits with the limit block 9 on the lower valve rod 502. At this time, the power block 7 can drive the lower valve rod 502 to rotate synchronously after rotation. Since the lower valve rod 502 is fixed to the valve plate body 4, the lower valve rod 502 can drive the valve plate body 4 to rotate synchronously and open after rotation. At the same time, the sealing ring sleeve 6 has been depressurized and shrunk, thereby reducing the friction between the sealing ring sleeve 6 and the inner wall of the valve body after rotation. The shrunk sealing ring sleeve 6 can also reduce the resistance between the valve plate body 4 and the inner wall of the valve body when rotating. When the valve plate body 4 needs to be closed, the upper valve stem 501 is rotated by the internal drive component of the valve seat 2. After the upper valve stem 501 rotates, the lower valve stem 502 can be rotated by the power block 7. After the lower valve stem 502 rotates, the valve plate body 4 can seal the inside of the butterfly valve body 1. After sealing the butterfly valve body 1, the upper valve stem 501 is rotated in the opposite direction by the drive component. After the upper valve stem 501 rotates, the power block 7 at its lower end disengages from the limit block 9 on the lower valve stem 502, so it will not drive the lower valve stem 502 to rotate. When the power block 7 and the movable plate 10 rotate, the pressing block 12 on the transmission rod 11 at the lower end of the movable plate 10 can press the pressure block 14 on the adjusting pressure plate 13. At this time, the pressure block 14 can drive the regulating pressure plate 13 to move down synchronously after being pressed. After the regulating pressure plate 13 moves, it can squeeze the main rubber sleeve 16, so that the airflow inside the main rubber sleeve 16 can be squeezed out into the sealing ring sleeve 6 through the air supply pipe 18. The expansion of the sealing ring sleeve 6 after being inflated can fit together with the inner wall of the valve body, realizing the sealing between the valve plate body 4 and the butterfly valve body 1. After the squeezing block 12 squeezes the pressure block 14, the power block 7 just comes into contact with the limit block 9 on the lower valve stem 502. After the fluid enters, the fluid pressure will not push the lower valve stem 502 and the valve plate body 4 to rotate.

[0030] Example 2: The technical content disclosed in this example is a further improvement based on Example 1 described above, such as... Figure 3 and Figure 7 As shown, in order to facilitate the control of the inflation expansion of the sealing ring sleeve 6 on the edge of the valve plate body 4, the following technical contents are disclosed in this embodiment: the main rubber sleeve 16 and the support plate 17 are fixedly connected, and the support plate 17 can slide inside the lower valve stem 502. The lower end of the support plate 17 is fixed with a support column 19, and an adjustment rod 20 is inserted inside the support column 19. The adjustment rod 20 is threadedly connected to the support column 19, and the cross-section of the support column 19 is set as a rectangular structure. The support column 19 can slide on the lower valve stem 502, and the adjustment rod 20 can rotate on the lower valve stem 502.

[0031] When the expansion of the sealing ring sleeve 6 needs to be adjusted, the adjusting rod 20 on the lower valve stem 502 is rotated. Since the adjusting rod 20 and the support column 19 are threadedly connected, the rotation of the adjusting rod 20 causes the threaded support column 19 to move synchronously with the upper support plate 17. The movement of the support plate 17 causes the main rubber sleeve 16 to move synchronously. When the support plate 17 moves and the main rubber sleeve 16 on it approaches the lower end of the adjusting pressure plate 13, the downward movement of the adjusting pressure plate 13 exerts a greater squeezing force on the main rubber sleeve 16. The main rubber sleeve 16 has a larger deformation, and at this time, the main rubber sleeve 16 delivers more air to the sealing ring sleeve 6 through the air supply pipe 18. When the support plate 17 moves away from the lower end of the main rubber sleeve 16 and the adjusting pressure plate 13, the squeezing force of the adjusting pressure plate 13 on the main rubber sleeve 16 decreases after the adjusting pressure plate 13 moves downward, and the deformation of the main rubber sleeve 16 is smaller. At this time, the amount of air delivered by the main rubber sleeve 16 to the sealing ring sleeve 6 through the air supply pipe 18 is also less. Thus, the expansion size of the circumferential sealing ring sleeve 6 of the valve plate body 4 can be adjusted according to actual needs.

[0032] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0033] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fully welded butterfly valve, comprising a butterfly valve body (1) and an actuator valve seat (2) mounted on the upper end of the butterfly valve body (1), wherein a positioning block (3) is mounted in the middle of the lower end of the butterfly valve body (1), a valve plate body (4) is mounted inside the butterfly valve body (1), a drive valve stem (5) is inserted into the middle of the valve plate body (4), and the upper end of the drive valve stem (5) is connected to the drive component in the actuator valve seat (2), characterized in that: A sealing ring (6) is circumferentially installed on the valve plate body (4). The sealing ring (6) is used to ensure the sealing between the valve plate body (4) and the butterfly valve body (1). The drive valve stem (5) includes an upper valve stem (501) and a lower valve stem (502). The lower valve stem (502) is fixed to the valve plate body (4). An inflation component is installed between the upper valve stem (501) and the lower valve stem (502). The inflation component is used to control the expansion and contraction of the sealing ring (6).

2. The all-welded butterfly valve according to claim 1, characterized in that: The valve plate body (4) is evenly distributed with multiple reinforcing ribs (21), which are made of steel and are welded to the valve plate body (4).

3. The all-welded butterfly valve according to claim 1, characterized in that: The upper valve stem (501) can rotate on the lower valve stem (502), and the lower end of the lower valve stem (502) is inserted into the interior of the positioning block (3), and the lower valve stem (502) can rotate on the positioning block (3).

4. The all-welded butterfly valve according to claim 1, characterized in that: The inflation component includes a power block (7) fixed to the lower end of the upper valve stem (501), and the power block (7) is located in the docking groove (8) opened at the upper end of the lower valve stem (502). The docking groove (8) is fixed with a limit stop (9). The lower end of the power block (7) is fixed with a movable disc (10), and the middle of the lower end of the movable disc (10) is fixed with a transmission rod (11). The lower side of the transmission rod (11) is equipped with a compression block (12), and an adjusting pressure plate (13) is provided below the compression block (12). The upper end of the adjusting pressure plate (13) is fixed with a pressure block (14), and the adjusting pressure plate (13) is connected to the lower valve stem (502) through an auxiliary spring (15). The lower end of the adjusting pressure plate (13) is provided with a main rubber sleeve (16), and the main rubber sleeve (16) is installed on the support plate (17).

5. A fully welded butterfly valve according to claim 4, characterized in that: The power block (7) at the lower end of the upper valve stem (501) and the limiting block (9) in the docking groove (8) of the lower valve stem (502) are in a non-contact state in the initial state, and the movable disk (10) at the lower end of the power block (7) can rotate on the lower valve stem (502).

6. A fully welded butterfly valve according to claim 5, characterized in that: The surface contours of the pressing block (12) at the lower end of the transmission rod (11) and the pressure block (14) above the adjusting pressure plate (13) are both set to arc shape, and the adjusting pressure plate (13) forms an elastic telescopic structure through the auxiliary spring (15) and the lower valve rod (502).

7. A fully welded butterfly valve according to claim 6, characterized in that: The lower end of the regulating pressure plate (13) does not contact the upper surface of the main rubber sleeve (16) in the initial state, and the interior of the main rubber sleeve (16) and the sealing ring sleeve (6) are both hollow structures. The main rubber sleeve (16) and the sealing ring sleeve (6) are both made of elastic rubber. The airflow inside the main rubber sleeve (16) can enter the interior of the sealing ring sleeve (6) through the air supply pipe (18).

8. A fully welded butterfly valve according to claim 7, characterized in that: The main rubber sleeve (16) and the support plate (17) are fixedly connected, and the support plate (17) can slide inside the lower valve stem (502). The lower end of the support plate (17) is fixed with a support column (19), and an adjustment rod (20) is inserted inside the support column (19).

9. A fully welded butterfly valve according to claim 8, characterized in that: The regulating rod (20) is threadedly connected to the support column (19), and the cross-section of the support column (19) is set as a rectangular structure. The support column (19) can slide on the lower valve rod (502), and the regulating rod (20) can rotate on the lower valve rod (502).

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