Butterfly valve

Abstract

The utility model relates to valve technical field discloses a butterfly valve, including valve body, valve rod is set up in the valve body along the axial penetration, butterfly plate frame is fixedly set up on the valve rod and rotates along with valve rod, sealing ring is fixedly set up on butterfly plate frame, and sealing ring is suitable for forming sealing structure with the sealing surface of valve body, deformation compensation subassembly is set up between sealing ring and valve body along the axial direction of valve rod, and deformation compensation subassembly is suitable for limiting sealing ring in the first direction when the axial displacement of valve rod occurs by heating, set up deformation compensation subassembly along the axial direction of valve rod between sealing ring and valve body, effectively solved the problem that the current high temperature butterfly valve generates the axial displacement because of the elongation of valve rod by heating under the working condition above 400 DEG C, and then leads to the uneven force of sealing ring or the clearance and causes the valve leakage.

Description

Technical Field

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

[0002] High-temperature butterfly valves, as crucial control devices in industrial applications for handling high-temperature conditions, primarily consist of a valve stem, sealing ring, butterfly plate holder, and valve body. In high-temperature environments, the valve stem must withstand continuous high temperatures while simultaneously working in conjunction with the sealing ring fixed to the butterfly plate holder to ensure the valve's sealing performance. To adapt to operational requirements under varying temperature conditions, the industry typically considers the thermal expansion characteristics of the valve stem, designing specific structures to allow for axial movement space to compensate for dimensional changes caused by thermal deformation. Traditional fixed limiting structures are used to restrict valve stem displacement, preventing it from detaching from the valve body and ensuring the safe operation of the equipment foundation.

[0003] However, in practical applications, especially when the operating temperature exceeds 400℃, the valve stem is prone to thermal elongation in high-temperature environments. This axial thermal deformation is directly transmitted to the sealing ring, resulting in uneven stress on the sealing surface or the formation of gaps, which ultimately leads to internal leakage of the valve and limits the upper limit of the operating temperature and sealing reliability of high-temperature butterfly valves. Utility Model Content

[0004] This utility model provides a butterfly valve to solve the problem of internal leakage in existing high-temperature butterfly valves when operating at temperatures above 400°C, caused by uneven stress or gaps on the sealing surface due to thermal expansion of the valve stem.

[0005] This utility model provides a butterfly valve, comprising: Valve body; A valve stem, which is axially inserted into the valve body; The butterfly plate frame is fixedly mounted on the valve stem and rotates with the valve stem; A sealing ring is fixedly mounted on the butterfly plate frame, and the sealing ring is adapted to form a sealing structure with the sealing surface of the valve body; A deformation compensation component is disposed along the axial direction of the valve stem between the sealing ring and the valve body. The deformation compensation component is adapted to limit the sealing ring in a first direction when the valve stem undergoes axial displacement due to heat.

[0006] Optionally, a valve cover is connected to the valve body by fasteners. One end of the deformation compensation component abuts against the valve cover, and the other end abuts against the sealing ring. When the valve stem is heated and undergoes axial displacement, the deformation compensation component generates compensation forces in a first direction and a second direction. The compensation force in the second direction is adapted to act on the valve cover to enhance the preload of the fasteners, and the compensation force in the first direction is adapted to act on the sealing ring to prevent its axial movement.

[0007] Optionally, the deformation compensation assembly includes a thrust pad, an elastic element, and a limiting sleeve sequentially sleeved on the valve stem along a first direction. The end of the thrust pad opposite to the elastic element is connected to the valve cover, and the end of the limiting sleeve opposite to the elastic element abuts against the sealing ring.

[0008] Optionally, the elastic element is a disc spring.

[0009] Optionally, the valve may further include an anti-blowout component disposed at the end of the valve stem exposed in the valve body, the anti-blowout component being adapted to limit the axial displacement of the valve stem.

[0010] Optionally, the valve stem is recessed on the side peripheral surface of the valve body to form an annular groove, and the anti-blowout assembly includes: An annular limiting member is partially disposed in the annular groove and partially protrudes out of the annular groove, and there is a first gap between the annular limiting member and the annular groove in the axial direction of the valve body. A fixing member is provided on the valve body or a bracket fixedly connected to the valve body. The fixing member has a limiting part protruding toward the annular limiting member. The limiting part is axially opposite to the outwardly protruding part of the annular limiting member, and there is a second gap between the two. The first gap and the second gap together constitute the allowable axial movement range of the valve stem. The limiting part is adapted to abut against the annular limiting member when the valve stem moves to the limit position to prevent the valve stem from dislodging from the valve body.

[0011] Optionally, valve covers are provided on both sides of the valve body, and there are two deformation compensation components, which are symmetrically arranged on the valve stem along the axial direction of the valve stem.

[0012] Optionally, a gasket is also provided at the connection between the valve cover and the valve body.

[0013] Optionally, the valve cover is provided with heat sinks.

[0014] Optionally, a stuffing box is formed inside the valve cover, and valve stem packing is disposed inside the stuffing box and surrounds the valve stem; And / or, the valve stem is rotatably connected to the valve body via a bearing.

[0015] Beneficial effects: The butterfly valve provided by this utility model includes a valve body and a valve stem, which is axially disposed in the valve body; A butterfly plate holder is fixedly mounted on the valve stem and rotates with the valve stem; a sealing ring is fixedly mounted on the butterfly plate holder, and the sealing ring is adapted to form a sealing structure with the sealing surface of the valve body; a deformation compensation component is disposed along the axial direction of the valve stem between the sealing ring and the valve body, and the deformation compensation component is adapted to limit the sealing ring in a first direction when the valve stem undergoes axial displacement due to heat.

[0016] The butterfly valve provided by this utility model effectively solves the problem of axial displacement caused by the elongation of the valve stem due to heat in existing high-temperature butterfly valves at temperatures above 400℃, which leads to uneven stress on the sealing ring or gaps and internal leakage. The deformation compensation component can precisely limit the sealing ring in the first direction when the valve stem undergoes axial displacement due to heat. This avoids the defects of traditional fixed limiting structures that cannot adapt to thermal deformation, and ensures a stable fit between the sealing ring and the valve body sealing surface. This improves the sealing reliability of the high-temperature butterfly valve under ultra-high temperature conditions, and breaks through the upper limit of the operating temperature of traditional high-temperature butterfly valves, thus expanding its application scenarios in the industrial high-temperature field. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a cross-sectional schematic diagram of a butterfly valve according to an embodiment of the present utility model; Figure 2 for Figure 1 A magnified view of a portion of point A in the middle; Figure 3 This is an enlarged cross-sectional view of the end of the valve stem exposed on the valve body in an embodiment of this utility model.

[0019] Explanation of reference numerals in the attached figures: 1. Valve body; 11. Valve cover; 12. Gasket; 13. Valve stem packing; 14. Bearing; 2. Valve stem; 21. Annular groove; 3. Butterfly plate frame; 4. Sealing ring; 5. Deformation compensation assembly; 51. Thrust pad; 52. Elastic element; 53. Limiting sleeve; 6. Anti-blowout assembly; 61. Annular limiting element; 62. Fixing element. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] The following is combined Figures 1 to 3 The following describes embodiments of the present invention.

[0022] According to an embodiment of the present invention, a butterfly valve is provided, comprising: Valve body 1; Valve stem 2, which is axially inserted into valve body 1; The butterfly plate frame 3 is fixedly mounted on the valve stem 2 and rotates with the valve stem 2; The sealing ring 4 is fixedly mounted on the butterfly plate frame 3, and the sealing ring 4 is adapted to form a sealing structure with the sealing surface of the valve body 1; The deformation compensation component 5 is disposed along the axial direction of the valve stem 2 between the sealing ring 4 and the valve body 1. The deformation compensation component 5 is adapted to limit the sealing ring 4 in the first direction when the valve stem 2 undergoes axial displacement due to heat.

[0023] The butterfly valve provided by this utility model effectively solves the problem of uneven force on the sealing ring 4 or gaps in the valve body 1 caused by the axial displacement of the valve stem 2 due to thermal expansion of the valve stem 2 under operating conditions above 400℃, which leads to internal leakage of the valve. The deformation compensation component 5 can accurately limit the sealing ring 4 in the first direction when the valve stem 2 undergoes axial displacement due to heat. This avoids the defect of traditional fixed limiting structure being unable to adapt to thermal deformation and can always ensure stable contact between the sealing ring 4 and the sealing surface of the valve body 1. This improves the sealing reliability of the high-temperature butterfly valve under ultra-high temperature conditions and breaks through the upper limit of the operating temperature of traditional high-temperature butterfly valves, thus broadening the application scenarios in the industrial high-temperature field.

[0024] Furthermore, a valve cover 11 is connected to the valve body 1 by fasteners. One end of the deformation compensation component 5 abuts against the valve cover 11, and the other end abuts against the sealing ring 4. When the valve stem 2 is heated and undergoes axial displacement, the deformation compensation component 5 generates compensation forces in the first direction and the second direction. The compensation force in the second direction is suitable for acting on the valve cover 11 to enhance the preload of the fasteners, and the compensation force in the first direction is suitable for acting on the sealing ring 4 to prevent its axial movement.

[0025] In a straightforward manner, the deformation compensation component 5 abuts against the valve cover 11 and the sealing ring 4 at both ends, respectively. When the valve stem 2 is heated and undergoes axial displacement, the deformation compensation component 5 can simultaneously generate compensation forces in the first and second directions. The compensation force in the first direction can directly act on the sealing ring 4, effectively preventing the sealing ring 4 from moving axially with the valve stem 2, ensuring that the sealing ring 4 always maintains a precise fit with the sealing surface of the valve body 1, further enhancing the sealing stability of the valve under high-temperature conditions, and avoiding internal leakage caused by gaps due to the displacement of the sealing ring 4. The compensation force in the second direction can act on the valve cover 11, and transmit the force to the fasteners through the valve cover 11, thereby enhancing the pre-tightening force of the fasteners, preventing the fasteners from loosening due to the high-temperature environment, ensuring the stability of the connection structure between the valve body 1 and the valve cover 11, avoiding damage to the overall sealing system due to loose connection, and improving the structural reliability and long-term operational stability of the butterfly valve under ultra-high temperature conditions.

[0026] Furthermore, the deformation compensation assembly 5 includes a thrust pad 51, an elastic element 52, and a limiting sleeve 53 sequentially sleeved on the valve stem 2 along the first direction. The end of the thrust pad 51 facing away from the elastic element 52 is connected to the valve cover 11, and the end of the limiting sleeve 53 facing away from the elastic element 52 abuts against the sealing ring 4.

[0027] In a straightforward manner, the deformation compensation component 5, with its structure consisting of a thrust pad 51, an elastic element 52, and a limiting sleeve 53 sequentially mounted along the first direction, allows the limiting sleeve 53 to directly transmit axial force to the elastic element 52 when the valve stem 2 is thermally displaced. The elastic element 52 then generates a compensation force through deformation, which is then stabilized onto the valve cover 11 via the thrust pad 51. This ensures that the bidirectional compensation force is efficiently and without loss applied to the target area, preventing the sealing or fastener pre-tightening effect from being affected by force transmission deviation. On the other hand, the modular component assembly facilitates assembly and subsequent maintenance. The thrust pad 51 reduces direct wear between the elastic element 52 and the valve cover 11, the limiting sleeve 53 accurately positions the force exerted by the elastic element 52 on the sealing ring 4, and the elastic element 52 can flexibly adapt to different degrees of thermal deformation through its own deformation. The synergy of these three components ensures the stability of the compensation function and extends the overall service life of the component.

[0028] In an alternative embodiment, the deformation compensation component 5 can be an integrated compensation sleeve. The integrated compensation sleeve has a reserved elastic deformation cavity inside, which is filled with an elastic material (such as high-temperature resistant rubber or metal spring sheet). One end of the compensation sleeve directly abuts against the valve cover 11, and the other end abuts against the sealing ring 4. The bidirectional compensation force output is achieved through the deformation of the internal elastic material, simplifying the assembly steps. In addition, a wear-resistant coating (such as a ceramic coating) can be added to the contact surface between the thrust pad 51 and the valve cover 11 to further reduce the wear of components caused by long-term friction and improve the compatibility and durability of the component.

[0029] Furthermore, the elastic element 52 is a disc spring.

[0030] Specifically, when the elastic element 52 is a disc spring, considering the different requirements for the magnitude of the compensation force and the deformation stroke under different working conditions, a single disc spring can be replaced with a disc spring group composed of multiple disc springs. By adjusting the number of disc springs (such as 2-5 pieces) or adopting different combination methods such as stacking or mating, the stacking combination can improve the load-bearing capacity of the disc spring group, which is suitable for scenarios where the valve stem 2 has a large amount of thermal deformation and requires a larger compensation force; the mating combination can increase the deformation stroke of the disc spring group, which is suitable for working conditions with a wide range of thermal deformation fluctuations. At the same time, the disc spring group as a whole still maintains the structure of being sleeved along the axial direction of the valve stem 2. One end is connected to the valve cover 11 through the thrust pad 51, and the other end is abutted against the sealing ring 4 through the limiting sleeve 53, ensuring a stable force transmission path.

[0031] Furthermore, it also includes an anti-blowout component 6, which is disposed at the end of the valve stem 2 exposed outside the valve body 1, and the anti-blowout component 6 is adapted to limit the displacement of the valve stem 2 in the axial direction.

[0032] As is easily understood, the end of the valve stem 2 exposed above the valve body 1 is provided with an anti-blowout component 6. This component can directly limit the axial displacement of the valve stem 2. Especially under ultra-high temperature conditions, even if the valve stem 2 has a large axial elongation tendency due to thermal expansion, the anti-blowout component 6 can also avoid the risk of excessive displacement of the valve stem 2 or even detachment from the valve body 1 through physical limiting, thus fundamentally ensuring the safety of equipment operation and making up for the shortcomings of traditional fixed limiting structures in adaptability at high temperatures.

[0033] Furthermore, the valve stem 2 is recessed on the side circumferential surface of the valve body 1 to form an annular groove 21, and the anti-blowout assembly 6 includes: The annular limiting member 61 is partially disposed in the annular groove 21 and partially protrudes out of the annular groove 21, and there is a first gap between the annular limiting member 61 and the annular groove 21 in the axial direction of the valve body 1. The fixing member 62 is disposed on the valve body 1 or the bracket fixedly connected to the valve body 1. The fixing member 62 has a limiting part protruding toward the annular limiting member 61. The limiting part is axially opposite to the outward protruding part of the annular limiting member 61, and there is a second gap between the two. The first gap and the second gap together constitute the allowable axial movement range of the valve stem 2. The limiting part is adapted to abut against the annular limiting member 61 when the valve stem 2 moves to the limit position to prevent the valve stem 2 from falling out of the valve body 1.

[0034] It should be noted that in this embodiment, the annular limiting member 61 is composed of two semi-annular clamps. The inner side of the clamps is provided with a protrusion that matches the annular groove 21. During assembly, the two clamps are fastened in the groove and secured with bolts. The semi-annular clamps are easier to assemble and disassemble after the valve stem 2 is installed, reducing maintenance difficulty.

[0035] In an optional embodiment, the fastener 62 can be configured as an annular flange structure. The annular flange is fixed to the end of the valve body 1 by bolts. Multiple protrusions are evenly arranged circumferentially on the inner side of the flange as limiting parts. The multiple limiting parts and the outward protrusion of the annular limiting part 61 form multiple points of contact. Compared with a single limiting part, it can disperse the force during limiting and avoid local stress concentration that could lead to component damage. In addition, if it is necessary to improve high temperature adaptability, both the annular limiting part 61 and the limiting part can be made of high temperature alloy material, and a nitrided layer can be sprayed on the contact surface of the two to enhance wear resistance and high temperature oxidation resistance, and adapt to higher temperature working environments.

[0036] In a straightforward manner, the annular limiting member 61 is partially embedded in the annular groove 21 of the valve stem 2, with a first gap maintained between them. A second gap is maintained between the limiting part of the fixing member 62 and the protruding part of the annular limiting member 61. Together, they constitute a reasonable range for the axial movement of the valve stem 2. This provides necessary space for the valve stem 2 to undergo thermal expansion and deformation at high temperatures, preventing damage to the valve stem 2 or valve body 1 due to rigidity. Furthermore, when the valve stem 2 reaches its displacement limit, precise limiting is achieved through the contact between the limiting part and the annular limiting member 61, effectively preventing the valve stem 2 from detaching from the valve body 1 and ensuring safe equipment operation. The component structure is simple and flexible in assembly. The fixing member 62 can be installed on the valve body 1 or a matching bracket according to actual needs, adapting to different valve body 1 structural designs. The interlocking installation of the annular limiting member 61 also ensures a stable connection with the valve stem 2, preventing loosening and failure during long-term use, further improving the reliability of the component.

[0037] Furthermore, valve covers 11 are provided on both sides of the valve body 1, and there are two deformation compensation components 5, which are symmetrically arranged on the valve stem 2 along the axial direction of the valve stem 2.

[0038] In a straightforward manner, the symmetrically distributed deformation compensation components 5 can simultaneously apply force to the sealing ring 4 from both ends of the valve stem 2, ensuring that the sealing ring 4 is subjected to uniform axial force. This avoids the sealing ring 4 tilting or uneven contact with the sealing surface of the valve body 1 due to unilateral force, further improving the sealing reliability of the valve. This is especially suitable for large-diameter butterfly valves or operating conditions with high sealing accuracy requirements. The cooperation between the valve covers 11 on both sides and the symmetrical compensation components can provide bidirectional thermal deformation compensation space for the valve stem 2. Regardless of which side the valve stem 2 elongates axially due to high temperature, the deformation compensation components 5 on the corresponding side can generate compensation force in time. This not only limits the displacement of the sealing ring 4, but also enhances the preload of the fasteners on the corresponding side through the compensation force, ensuring the stability of the connection structure on both sides of the valve body 1. This avoids stress concentration in components caused by excessive unilateral thermal deformation, extends the overall service life of the butterfly valve, and broadens its adaptability under complex high-temperature operating conditions.

[0039] Furthermore, a gasket 12 is provided at the connection between the valve cover 11 and the valve body 1.

[0040] It is easy to understand that adding a gasket 12 at the connection between the valve cover 11 and the valve body 1 can improve the sealing performance and structural protection of the connection: the gasket 12 can fill the tiny gaps between the valve cover 11 and the valve body 1 caused by machining precision or long-term use, prevent high-temperature media from leaking from the connection gaps, and form a double seal with the deformation compensation component 5, further ensuring the overall sealing reliability of the butterfly valve.

[0041] Specifically, if the operating temperature is between 400℃ and 600℃ for the butterfly valve and the medium is not highly corrosive, flexible graphite gasket 12 can be selected. It has excellent high temperature resistance (can withstand temperatures above 800℃ for the butterfly valve), good compression and rebound performance, can fit tightly to the connection surface, and has strong chemical stability, making it suitable for most industrial media. If the operating temperature exceeds 600℃ for the butterfly valve or the medium is highly corrosive (such as acid or alkali solutions), it is recommended to use metal-coated gasket 12, which has a stainless steel skeleton and is filled with high-temperature resistant insulating material (such as ceramic fiber). It has both the high strength and high temperature resistance of metal and can achieve sealing through the internal filling material, preventing corrosive media from eroding the metal connection surface.

[0042] Furthermore, the valve cover 11 is provided with heat sinks.

[0043] It is easy to understand that setting heat sinks on the valve cover 11 can effectively optimize the high-temperature adaptability of the butterfly valve. The heat sinks can increase the contact area between the valve cover 11 and the air, accelerate the heat conduction and convection heat dissipation on the surface of the valve cover 11, and dissipate the heat transferred from the high-temperature medium inside the valve body 1 to the valve cover 11 to the external environment in a timely manner, so as to avoid the valve cover 11 and surrounding components being in an ultra-high temperature state for a long time. It can also reduce the high-temperature fatigue wear of the elastic element 52 in the deformation compensation component 5, extend its service life, and thus maintain the overall operational stability of the butterfly valve.

[0044] Furthermore, a stuffing box is formed inside the valve cover 11, and the valve stem packing 13 is disposed inside the stuffing box and surrounds the valve stem 2.

[0045] It is easy to understand that setting a stuffing box inside the valve cover 11 and placing the valve stem packing 13 surrounding the valve stem 2 within it can add sealing and protection to the butterfly valve. The valve stem packing 13 can tightly fit the outer circumferential surface of the valve stem 2 and the inner wall of the stuffing box to form a radial sealing structure, effectively preventing the high-temperature medium inside the valve body 1 from leaking outward along the gap between the valve stem 2 and the valve cover 11, supplementing the sealing effect of the gasket 12 at the connection between the valve cover 11 and the valve body 1, and further improving the overall sealing reliability of the butterfly valve. The packing can play a lubricating and buffering role during the rotation and axial movement of the valve stem 2, reducing the direct friction and wear between the valve stem 2 and the valve cover 11, while preventing external dust and impurities from entering the interior of the valve body 1, protecting the valve stem 2 and internal components from contamination, extending the service life of the valve stem 2, and ensuring its flexible operation under high-temperature conditions.

[0046] Specifically, the valve stem packing 13 should be made of a material suitable for high-temperature operating conditions, with flexible graphite packing, metal-coated graphite packing, or high-temperature resistant polytetrafluoroethylene packing being preferred. Flexible graphite packing has excellent high-temperature resistance (can withstand temperatures above 800℃) and sealing performance, and a low coefficient of friction, making it suitable for long-term high-temperature cyclic operating conditions; metal-coated graphite packing, while retaining the high-temperature resistance of graphite, enhances structural strength and is suitable for high-pressure and high-temperature scenarios; the cross-sectional shape of the packing can be square, wedge-shaped, or V-shaped according to the structure of the stuffing box, and it needs to be properly tightened by the packing gland to ensure a tight fit between the packing and the valve stem 2 and the stuffing box, while avoiding excessive tightening that would increase the rotational resistance of the valve stem 2, thus achieving a balance between sealing performance and operational flexibility.

[0047] Furthermore, the valve stem 2 is rotatably connected to the valve body 1 via the bearing 14.

[0048] In a straightforward manner, the bearing 14 can convert the sliding friction between the valve stem 2 and the valve body 1 into rolling friction, reducing the frictional resistance when the two rotate relative to each other. This not only makes the rotation of the valve stem 2 easier and more flexible, reducing the load on the drive device (such as the handle or actuator), reducing energy consumption and operational difficulty, but also prevents severe wear on the mating surfaces of the valve stem 2 and the valve body 1 caused by long-term sliding friction, effectively extending the service life of the valve stem 2 and the valve body 1.

[0049] Although embodiments of the present 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 present 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 stem (2) is axially inserted into the valve body (1); The butterfly plate frame (3) is fixedly mounted on the valve stem (2) and rotates with the valve stem (2); A sealing ring (4) is fixedly mounted on the butterfly plate frame (3), and the sealing ring (4) is adapted to form a sealing structure with the sealing surface of the valve body (1); The deformation compensation component (5) is disposed along the axial direction of the valve stem (2) between the sealing ring (4) and the valve body (1). The deformation compensation component (5) is adapted to limit the sealing ring (4) in a first direction when the valve stem (2) is heated and undergoes axial displacement.

2. The butterfly valve according to claim 1, characterized in that, A valve cover (11) is connected to the valve body (1) by fasteners. One end of the deformation compensation component (5) abuts against the valve cover (11) and the other end abuts against the sealing ring (4). When the valve stem (2) is heated and undergoes axial displacement, the deformation compensation component (5) generates compensation forces in the first direction and the second direction. The compensation force in the second direction is suitable for acting on the valve cover (11) to enhance the preload of the fasteners, and the compensation force in the first direction is suitable for acting on the sealing ring (4) to prevent its axial movement.

3. The butterfly valve according to claim 2, characterized in that, The deformation compensation component (5) includes a thrust pad (51), an elastic element (52) and a limiting sleeve (53) sequentially sleeved on the valve stem (2) along the first direction. One end of the thrust pad (51) away from the elastic element (52) is connected to the valve cover (11), and one end of the limiting sleeve (53) away from the elastic element (52) abuts against the sealing ring (4).

4. The butterfly valve according to claim 3, characterized in that, The elastic element (52) is a disc spring.

5. The butterfly valve according to any one of claims 1-4, characterized in that, It also includes a blowout prevention component (6), which is disposed at the end of the valve stem (2) exposed outside the valve body (1), and the blowout prevention component (6) is adapted to limit the displacement of the valve stem (2) in the axial direction.

6. The butterfly valve according to claim 5, characterized in that, The valve stem (2) is recessed on the side circumferential surface of the valve body (1) to form an annular groove (21), and the anti-blowout assembly (6) includes: The annular limiting member (61) is partially disposed in the annular groove (21) and partially protrudes outward from the annular groove (21), and there is a first gap between the annular limiting member (61) and the annular groove (21) in the axial direction of the valve body (1); A fixing member (62) is provided on the valve body (1) or a bracket fixedly connected to the valve body (1). The fixing member (62) has a limiting part protruding toward the annular limiting member (61). The limiting part is axially opposite to the outward protruding part of the annular limiting member (61), and there is a second gap between them. The first gap and the second gap together constitute the allowable axial movement range of the valve stem (2). The limiting part is adapted to abut against the annular limiting member (61) when the valve stem (2) moves to the limit position to prevent the valve stem (2) from falling out of the valve body (1).

7. The butterfly valve according to any one of claims 2-4, characterized in that, The valve body (1) is provided with valve covers (11) on both sides, and there are two deformation compensation components (5), which are symmetrically arranged on the valve stem (2) along the axial direction of the valve stem (2).

8. The butterfly valve according to claim 7, characterized in that, A gasket (12) is also provided at the connection between the valve cover (11) and the valve body (1).

9. The butterfly valve according to claim 7, characterized in that, The valve cover (11) is provided with heat sinks.

10. The butterfly valve according to claim 7, characterized in that, A stuffing box is formed inside the valve cover (11), and the valve stem packing (13) is disposed inside the stuffing box and surrounds the valve stem (2). And / or, the valve stem (2) is rotatably connected to the valve body (1) via a bearing (14).

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