Butterfly valve

Abstract

The present application relates to butterfly valve technical field, specifically to a kind of butterfly valve.The butterfly valve, including: valve body, valve body includes medium passage, rotatable butterfly plate is in medium passage;Anti-corrosion structure, anti-corrosion structure covers the inner wall of medium passage, anti-corrosion structure has the first sealing portion protruding towards butterfly plate, the first sealing portion has elasticity, the first sealing portion is in contact with butterfly plate, annular elastic member is set in the first sealing portion, elastic member is provided with multiple interval setting cut groove, adjacent cut groove is structured as spring piece, spring piece provides elastic driving force for the first sealing portion.The first sealing portion has better elasticity, can be more effectively in contact with butterfly plate, improve sealing performance, at the same time, since elastic member is divided into multiple spring pieces, reduce overall stiffness, improve elasticity, ensure that good rebound effect can be maintained after long time use, avoid the sealing leakage problem caused by rubber long time under pressure and unable to rebound.

Description

Technical Field

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

[0002] In some highly corrosive operating conditions, the medium passing through the valve is highly corrosive. Therefore, the valve body requires high corrosion resistance and must be made of highly corrosion-resistant materials, which increases the valve cost. To save costs, the valve body is usually treated with rubber vulcanization to prevent the medium from directly contacting the valve body. This allows the valve body to be made of ordinary materials while still meeting the requirements of the operating conditions.

[0003] However, due to the softness of rubber, a large amount of compression is usually required to achieve the sealing pressure with the butterfly plate. In this case, when the butterfly plate closes or opens, a larger portion cuts into the rubber, resulting in a larger torque. Especially when the medium is gas or similar dry dust, the valve may fail to close or the closing torque may be too large. In addition, if the valve is in the closed state for a long time, that is, the butterfly plate compresses the rubber for a long time, the rubber may have difficulty rebounding, which may lead to sealing leakage. Summary of the Invention

[0004] In view of this, the present invention provides a butterfly valve to solve the problem that a large portion of the rubber is cut into, resulting in a large torque, which easily leads to the valve being unable to close or having an excessive closing torque. Furthermore, if the valve is in a closed state for a long time, that is, the butterfly plate presses the rubber for a long time, the rubber may not be able to rebound, thus causing sealing leakage.

[0005] This invention provides a butterfly valve, comprising:

[0006] A valve body, the valve body including a medium channel, the medium channel having a rotatable butterfly plate;

[0007] The anti-corrosion structure covers the inner wall of the medium channel. The anti-corrosion structure has a first sealing part protruding towards the butterfly plate. The first sealing part is elastic and abuts against the butterfly plate. An annular elastic element is provided in the first sealing part. The elastic element has multiple spaced grooves. Adjacent grooves are configured with spring pieces. The spring pieces provide elastic driving force for the first sealing part.

[0008] Beneficial effects:

[0009] In the butterfly valve provided by the present invention, the first sealing part has better elasticity and can more effectively abut against the butterfly plate, thereby improving the sealing performance. At the same time, since the elastic element is divided into multiple spring pieces, the overall stiffness is reduced and the elasticity is improved, ensuring that it can still maintain a good rebound effect after long-term use, and avoiding the sealing leakage problem caused by the rubber being unable to rebound due to prolonged pressure.

[0010] In one optional embodiment, the inner wall of the medium channel is provided with an annular mounting position, and the elastic element is disposed within the annular mounting position.

[0011] Beneficial effects:

[0012] By positioning the root of the elastic element within the annular mounting position, the installation of the elastic element is made more stable. Simultaneously, the annular mounting position provides a certain degree of restraint for the elastic element, preventing it from shifting or falling off during stress, further improving the stability and sealing performance of the butterfly valve. Furthermore, the elastic element is designed in a seesaw manner, allowing it to deform more significantly under stress, thus providing greater elasticity and ensuring a tight fit between the first sealing part and the butterfly plate, improving the sealing effect.

[0013] In one optional embodiment, the elastic element is composed of multiple elastic segments, which are disposed within the annular mounting position and connected end to end to form the elastic element.

[0014] Beneficial effects:

[0015] Dividing the elastic element into multiple elastic segments facilitates its installation into the valve body. Furthermore, the interconnected segments form a complete elastic element, ensuring its integrity and continuity. This multi-segment design allows for more even stress distribution under load, preventing stress concentration that could lead to damage or failure, thus improving the butterfly valve's stability and service life. Each segment can independently provide elastic force, ensuring more even stress distribution on the first sealing part when compressed by the butterfly plate, thereby enhancing sealing performance.

[0016] In one alternative implementation, the plurality of elastic segments include a pair of first segments and a pair of second segments, wherein the length of the first segment is greater than that of the second segment, and both ends of the first segment are respectively connected to one end of the pair of second segments.

[0017] Beneficial effects:

[0018] The second segment is longer than the first, a design that allows for a more rational stress distribution within the elastic element under load. Its longer length also provides greater deformation space, enabling better energy absorption and storage when the flap closes. Furthermore, the second segment serves as a connector and support, ensuring the overall stability and reliability of the elastic element.

[0019] In one optional embodiment, the valve body further includes a sealing sleeve, a valve stem is rotatably disposed within the sealing sleeve, a sealing structure is provided between the sealing sleeve and the valve stem, a locking structure is fitted on the sealing sleeve, and an anti-corrosion structure is disposed on the outer periphery of the sealing sleeve, with the locking structure and the anti-corrosion structure tightly fitted together.

[0020] Beneficial effects:

[0021] The locking structure and the anti-corrosion structure fit together tightly, which can limit the anti-corrosion structure and prevent it from falling off, thus further improving the sealing performance of the butterfly valve. In this embodiment, the locking structure and the anti-corrosion structure are installed by an interference fit, that is, the inner diameter of the locking structure is slightly smaller than the outer diameter of the anti-corrosion structure. During installation, the locking structure is forcibly fitted onto the outer circumference of the anti-corrosion structure, so that an interference fit is generated between the locking structure and the anti-corrosion structure, thereby achieving a tight fit effect.

[0022] In one optional embodiment, the valve body is provided with a sealing groove along the outer periphery of the sealing sleeve, the anti-corrosion structure has a second sealing part disposed in the sealing groove, the second sealing part applies an inward pressing force to the sealing sleeve, and the locking structure is tightly fitted with the second sealing part.

[0023] Beneficial effects:

[0024] The second sealing part applies an inward compressive force to the sealing sleeve, allowing the anti-corrosion structure to more tightly grip the sealing sleeve, thus improving the sealing performance between the sealing sleeve and the valve body. Simultaneously, the locking structure is fitted around the outer periphery of the anti-corrosion structure and fits tightly with the second sealing part, further limiting the anti-corrosion structure and preventing it from detaching, ensuring the stability and sealing performance of the butterfly valve. The second sealing part not only improves the sealing performance but also enhances the butterfly valve's corrosion resistance, extending its service life.

[0025] In one alternative embodiment, the second sealing portion has a protrusion extending out of the sealing groove, and the locking structure has a locking groove that matches the outer contour of the protrusion, the locking groove being tightly fitted with the protrusion.

[0026] Beneficial effects:

[0027] The engagement between the protrusion and the locking groove ensures a more secure fit of the locking structure onto the outer periphery of the corrosion-resistant structure, preventing loosening or detachment under stress. This tight fit further enhances the butterfly valve's stability and sealing performance. Furthermore, the engagement provides guidance, ensuring the locking structure is accurately fitted onto the outer periphery of the corrosion-resistant structure during installation, avoiding any reduction in sealing performance due to installation deviations.

[0028] In one optional embodiment, the outer diameter of the protrusion gradually decreases from the bottom to the top, the outer diameter surface of the protrusion is an inclined surface, and the inner diameter surface of the protrusion is in close contact with the outer diameter surface of the sealing sleeve.

[0029] Beneficial effects:

[0030] The outer diameter surface of the protrusion is inclined, which can form a larger contact area with the groove wall of the locking groove, improving the stability and sealing of the fit. At the same time, the tight fit between the inner diameter surface of the protrusion and the outer diameter surface of the sealing sleeve further enhances the connection strength between the anti-corrosion structure and the sealing sleeve, avoiding the problem of media leakage caused by poor connection.

[0031] In one alternative embodiment, the sealing structure includes a plurality of O-rings spaced apart from each other.

[0032] Beneficial effects:

[0033] The design with multiple O-rings spaced apart allows each O-ring to function independently in sealing. Even if one O-ring wears out or fails, the others can still maintain their sealing performance, thereby improving the sealing reliability and stability of the butterfly valve.

[0034] In one optional embodiment, both the end face of the sealing sleeve that contacts the butterfly plate and the end face of the butterfly plate that contacts the sealing sleeve are provided with wear-resistant structures.

[0035] Beneficial effects:

[0036] The wear-resistant structure reduces wear on the sealing sleeve and butterfly plate, extending their service life. Attached Figure Description

[0037] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0038] Figure 1This is a cross-sectional view of a butterfly valve according to an embodiment of the present invention;

[0039] Figure 2 for Figure 1 A magnified view of part A in the diagram;

[0040] Figure 3 This is a schematic diagram of the elastic element according to an embodiment of the present invention;

[0041] Figure 4 This is a schematic diagram of the elastic segment according to an embodiment of the present invention;

[0042] Figure 5 This is a schematic diagram of the locking structure according to an embodiment of the present invention.

[0043] Explanation of reference numerals in the attached figures:

[0044] 1. Valve body; 2. Medium passage; 3. Butterfly plate; 4. Corrosion-resistant structure; 401. First sealing part; 402. Second sealing part; 403. Protrusion; 5. Elastic element; 501. Groove; 502. Spring; 503. Elastic section; 5031. First section; 5032. Second section; 6. Annular mounting position; 7. Sealing sleeve; 8. Valve stem; 9. Sealing structure; 10. Locking structure; 1001. Locking groove; 11. Sealing groove; 12. Wear-resistant structure. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, 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.

[0046] The following is combined Figures 1 to 5 The following describes embodiments of the present invention.

[0047] According to an embodiment of the present invention, a butterfly valve is provided, comprising a valve body 1 and a corrosion-resistant structure 4.

[0048] Specifically, the valve body 1 includes a medium channel 2, within which a rotatable butterfly plate 3 is located. An anti-corrosion structure 4 covers the inner wall of the medium channel 2. The anti-corrosion structure 4 has a first sealing portion 401 protruding towards the butterfly plate 3. The first sealing portion 401 is elastic and abuts against the butterfly plate 3. An annular elastic element 5 is provided within the first sealing portion 401. The elastic element 5 has multiple spaced grooves 501, and adjacent grooves 501 are connected by a spring sheet 502, which provides elastic driving force to the first sealing portion 401.

[0049] In this embodiment, the butterfly valve is used in highly corrosive working conditions. The medium flowing through the butterfly valve is highly corrosive. The anti-corrosion structure 4 is made of vulcanized rubber, which covers the inner wall of the medium channel 2, thereby separating the valve body 1 from the highly corrosive medium in the medium channel 2 and preventing the medium from corroding the valve body 1. The anti-corrosion structure 4 has a first sealing part 401 protruding towards the butterfly plate 3. When the valve is in a sealed state, the first sealing part 401 is located on the periphery of the butterfly plate 3. The first sealing part 401 has elasticity and abuts against the butterfly plate 3 under the action of elasticity. An annular elastic element 5 is provided inside the first sealing part 401. The elastic element 5 has multiple spaced grooves 501. The multiple grooves 501 can divide the elastic element 5 into several spring pieces 502. Preferably, the elastic element 5 is a spring steel plate. Dividing it into spring pieces 502 can reduce the overall stiffness of the elastic element 5, improve elasticity, and ensure the rebound effect. During the process of switching the valve from the open state to the sealed state, the butterfly plate 3 rotates and squeezes the first sealing part 401, so that the first sealing part 401 abuts against the butterfly plate 3 to complete a tight fit. At the same time, a force is applied to the spring piece 502, causing the spring piece 502 to bend and store energy. During the process of switching the valve from the sealed state to the open state, the butterfly plate 3 rotates, the force applied by the butterfly plate 3 to the spring piece 502 disappears, the spring piece 502 releases its elasticity, and drives the first sealing part 401 to reset.

[0050] In the butterfly valve of this embodiment, the first sealing part 401 has better elasticity and can more effectively abut against the butterfly plate 3, thereby improving the sealing performance. At the same time, since the elastic element 5 is divided into multiple spring pieces 502, the overall rigidity is reduced and the elasticity is improved, ensuring that it can still maintain a good rebound effect after long-term use, and avoiding the sealing leakage problem caused by the rubber being unable to rebound due to prolonged pressure.

[0051] In one embodiment, the inner wall of the medium channel 2 is provided with an annular mounting position 6, and the elastic element 5 is disposed in the annular mounting position 6.

[0052] Specifically, such as Figure 1 As shown, the root of the elastic element 5 is positioned within the annular mounting position 6, forming a seesaw shape. This allows the elastic force of the elastic element 5 to be large and controllable. When the valve is closed, the butterfly plate 3 pushes open the first sealing part 401, causing the spring piece 502 to bend and store energy, maintaining the sealing pressure between the first sealing part 401 and the butterfly plate 3. By positioning the root of the elastic element 5 within the annular mounting position 6, the installation of the elastic element 5 is more stable. Simultaneously, the annular mounting position 6 provides a certain limiting effect on the elastic element 5, preventing it from shifting or falling off during stress, further improving the stability and sealing performance of the butterfly valve. Furthermore, the seesaw-like arrangement of the elastic element 5 allows for greater deformation under stress, providing greater elastic force and ensuring a tight fit between the first sealing part 401 and the butterfly plate 3, thus improving the sealing effect.

[0053] In one embodiment, the elastic element 5 is composed of a plurality of elastic segments 503, which are disposed within the annular mounting position 6 and are connected end to end to form the elastic element 5.

[0054] Specifically, such as Figure 3 As shown, the elastic element 5 is divided into multiple elastic segments 503, which facilitates its installation into the valve body 1. Furthermore, the multiple elastic segments 503 are connected end-to-end to form a complete elastic element 5, ensuring its integrity and continuity. In addition, the design of multiple elastic segments 503 allows for a more even distribution of stress on the elastic element 5 under load, preventing stress concentration that could damage or cause failure, thus further improving the stability and service life of the butterfly valve. Each elastic segment 503 can independently provide elastic force, allowing the first sealing part 401 to experience more even stress when compressed by the butterfly plate 3, thereby improving sealing performance.

[0055] In one embodiment, the plurality of elastic segments 503 include a pair of first segments 5031 and a pair of second segments 5032, wherein the length of the second segments 5032 is greater than that of the first segments 5031, and both ends of the first segments 5031 are respectively connected to one end of the pair of second segments 5032.

[0056] Specifically, such as Figure 3 As shown, a pair of first segments 5031 are located on the upper and lower sides of the elastic element 5, respectively, and a pair of second segments 5032 are located on the left and right sides of the elastic element 5, respectively. The second segment 5032 is longer than the first segment 5031, a design that allows the elastic element 5 to form a more reasonable stress distribution when under force. Due to its longer length, the second segment 5032 can provide greater deformation space, thus better absorbing and storing energy when the butterfly plate 3 is closed. The second segment 5032 also serves as a connector and support, ensuring the overall stability and reliability of the elastic element 5.

[0057] In one embodiment, the valve body 1 also has a sealing sleeve 7, the valve stem 8 is rotatably disposed in the sealing sleeve 7, the sealing sleeve 7 and the valve stem 8 have a sealing structure 9, the sealing sleeve 7 is fitted with a locking structure 10, and the anti-corrosion structure 4 is disposed on the outer periphery of the sealing sleeve 7, and the locking structure 10 and the anti-corrosion structure 4 are tightly fitted together.

[0058] Specifically, such as Figure 1 and Figure 2As shown, the sealing sleeve 7 is disposed inside the valve body 1, and the sealing sleeve 7 fits tightly with the valve body 1. The valve stem 8 extends into the valve body 1 and is rotatably disposed inside the sealing sleeve 7. A sealing structure 9 is provided between the valve stem 8 and the sealing sleeve 7 to prevent the medium from entering between the valve stem 8 and the sealing sleeve 7. The anti-corrosion structure 4 is disposed on the outer periphery of the sealing sleeve 7. The anti-corrosion structure 4 applies an inward compressive force to the sealing sleeve 7 so that the anti-corrosion structure 4 holds the sealing sleeve 7 tightly, ensuring the sealing performance between the sealing sleeve 7 and the valve body 1. The locking structure 10 fits tightly with the anti-corrosion structure 4, which can limit the anti-corrosion structure 4 and prevent it from falling off, further improving the sealing performance of the butterfly valve. In this embodiment, the locking structure 10 and the anti-corrosion structure 4 are installed by an interference fit, that is, the inner diameter of the locking structure 10 is slightly smaller than the outer diameter of the anti-corrosion structure 4. During installation, the locking structure 10 is forcibly fitted onto the outer periphery of the anti-corrosion structure 4, so that an interference fit is generated between the locking structure 10 and the anti-corrosion structure 4, thereby achieving a tight fit effect.

[0059] In one embodiment, the valve body 1 is provided with a sealing groove 11 along the outer periphery of the sealing sleeve 7, and the anti-corrosion structure 4 has a second sealing part 402 disposed in the sealing groove 11. The second sealing part 402 applies an inward pressing force to the sealing sleeve 7, and the locking structure 10 is tightly engaged with the second sealing part 402.

[0060] Specifically, such as Figure 2 As shown, the valve body 1 has a sealing groove 11 along the outer periphery of the sealing sleeve 7. The anti-corrosion structure 4 has a second sealing part 402 extending into the sealing groove 11. The second sealing part 402 applies an inward pressing force to the sealing sleeve 7, allowing the anti-corrosion structure 4 to more tightly grip the sealing sleeve 7, thus improving the sealing performance between the sealing sleeve 7 and the valve body 1. Simultaneously, the locking structure 10 is fitted around the outer periphery of the anti-corrosion structure 4 and tightly cooperates with the second sealing part 402, further limiting the anti-corrosion structure 4 and preventing it from falling off, thus ensuring the stability and sealing performance of the butterfly valve. The second sealing part 402 not only improves the sealing performance but also enhances the corrosion resistance of the butterfly valve, extending its service life.

[0061] In one embodiment, the second sealing part 402 has a protrusion 403 extending out of the sealing groove 11, and the locking structure 10 has a locking groove 1001 that matches the outer contour of the protrusion 403, and the locking groove 1001 is in close contact with the protrusion 403.

[0062] Specifically, such as Figure 2 and Figure 5As shown, the engagement between the protrusion 403 and the locking groove 1001 allows the locking structure 10 to be more securely fitted onto the outer periphery of the anti-corrosion structure 4, preventing the locking structure 10 from loosening or falling off during stress. The tight fit between the protrusion 403 and the locking groove 1001 further improves the stability and sealing performance of the butterfly valve. Simultaneously, the engagement between the protrusion 403 and the locking groove 1001 also provides a guiding effect, allowing the locking structure 10 to be more accurately fitted onto the outer periphery of the anti-corrosion structure 4 during installation, avoiding a decrease in sealing performance due to installation deviations.

[0063] In one embodiment, the outer diameter of the protrusion 403 gradually decreases from bottom to top, the outer diameter surface of the protrusion 403 is a slope, and the inner diameter surface of the protrusion 403 is in close contact with the outer diameter surface of the sealing sleeve 7.

[0064] Specifically, such as Figure 2 and Figure 5 As shown, the protrusion 403 has a certain degree of elasticity. During installation, the locking groove 1001 provides pressure to the protrusion 403. Under the action of elasticity, the protrusion 403 fits into the locking groove 1001, thus making it easier to achieve a tight fit. When the protrusion 403 is subjected to the pressure of the locking groove 1001, it not only applies elastic force to the locking groove 1001 but also applies elastic force to the sealing sleeve 7, causing the inner diameter surface of the protrusion 403 to tightly grip the sealing sleeve 7. The outer diameter surface of the protrusion 403 is a slope, which can form a larger contact area with the groove wall of the locking groove 1001, improving the stability and sealing performance of the fit. At the same time, the tight fit between the inner diameter surface of the protrusion 403 and the outer diameter surface of the sealing sleeve 7 further enhances the connection strength between the anti-corrosion structure 4 and the sealing sleeve 7, avoiding the problem of media leakage caused by weak connection.

[0065] In one embodiment, the sealing structure 9 includes a plurality of O-rings, with adjacent O-rings spaced apart.

[0066] Specifically, such as Figure 2 As shown, the sealing structure 9 includes three O-rings, which are spaced apart from each other. The inner diameter surface of the sealing sleeve 7 has an installation groove, and the O-rings are installed within the groove. This design of multiple spaced O-rings allows each O-ring to independently provide a seal. Even if one O-ring wears or fails, the others can still maintain their sealing performance, thus improving the sealing reliability and stability of the butterfly valve. As a common sealing element, the O-ring has advantages such as simple structure, convenient installation, and good sealing effect, effectively preventing media leakage and ensuring the normal operation of the butterfly valve.

[0067] In other embodiments, the sealing structure 9 may also include a graphite ring, which is spaced apart from the O-ring.

[0068] In one embodiment, the end face of the sealing sleeve 7 that contacts the butterfly plate 3 and the end face of the butterfly plate 3 that contacts the sealing sleeve 7 are both provided with wear-resistant structures 12.

[0069] Specifically, such as Figure 2 As shown, the wear-resistant structure 12 can reduce the wear of the sealing sleeve 7 and the butterfly plate 3, and extend the service life of the sealing sleeve 7 and the butterfly plate 3. Preferably, the wear-resistant structure 12 is constructed by welding. In other optional embodiments, the wear-resistant structure 12 can be a wear-resistant metal coating, such as a metal alloy coating containing nickel-based alloys or cobalt-based alloys, or a metal-ceramic composite coating containing tungsten carbide-cobalt or chromium carbide-nickel-chromium, etc.

[0070] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A butterfly valve, characterized in that, include: Valve body (1), the valve body (1) includes a medium channel (2), the medium channel (2) has a rotatable butterfly plate (3); The anti-corrosion structure (4) covers the inner wall of the medium channel (2). The anti-corrosion structure (4) has a first sealing part (401) protruding towards the butterfly plate (3). The first sealing part (401) is elastic and abuts against the butterfly plate (3). An annular elastic element (5) is provided in the first sealing part (401). The elastic element (5) has multiple spaced grooves (501). The adjacent grooves (501) are constructed as spring pieces (502). The spring pieces (502) provide elastic driving force for the first sealing part (401). The inner wall of the medium channel (2) is provided with an annular mounting position (6), and the elastic element (5) is disposed in the annular mounting position (6); The elastic element (5) is composed of multiple elastic segments (503), which are disposed within the annular mounting position (6) and are connected end to end to form the elastic element (5). The plurality of elastic segments (503) include a pair of first segments (5031) and a pair of second segments (5032), wherein the length of the first segment (5031) is greater than that of the second segment (5032), and both ends of the first segment (5031) are respectively connected to one end of the pair of second segments (5032).

2. The butterfly valve according to claim 1, characterized in that, The valve body (1) also has a sealing sleeve (7), and the valve stem (8) is rotatably disposed in the sealing sleeve (7). There is a sealing structure (9) between the sealing sleeve (7) and the valve stem (8). A locking structure (10) is fitted on the sealing sleeve (7). The anti-corrosion structure (4) is disposed on the outer periphery of the sealing sleeve (7). The locking structure (10) and the anti-corrosion structure (4) are tightly fitted together.

3. The butterfly valve according to claim 2, characterized in that, The valve body (1) has a sealing groove (11) along the outer periphery of the sealing sleeve (7), and the anti-corrosion structure (4) has a second sealing part (402) disposed in the sealing groove (11). The second sealing part (402) applies an inward pressing force to the sealing sleeve (7), and the locking structure (10) is in close cooperation with the second sealing part (402).

4. The butterfly valve according to claim 3, characterized in that, The second sealing part (402) has a protrusion (403) extending out of the sealing groove (11), and the locking structure (10) has a locking groove (1001) that matches the outer contour of the protrusion (403), and the locking groove (1001) fits tightly with the protrusion (403).

5. The butterfly valve according to claim 4, characterized in that, The outer diameter of the protrusion (403) gradually decreases from the bottom to the top. The outer diameter surface of the protrusion (403) is an inclined surface. The inner diameter surface of the protrusion (403) is in close contact with the outer diameter surface of the sealing sleeve (7).

6. The butterfly valve according to claim 2, characterized in that, The sealing structure (9) includes a plurality of O-rings, which are spaced apart from each other.

7. The butterfly valve according to claim 2, characterized in that, The end face of the sealing sleeve (7) that contacts the butterfly plate (3) and the end face of the butterfly plate (3) that contacts the sealing sleeve (7) are both provided with wear-resistant structures (12).

Images