Butterfly valve

Abstract

The utility model discloses a butterfly valve, which belongs to the technical field of valves and comprises a valve body, a valve rod, a packing box and a sealing and supporting assembly. The valve plate is arranged in the center of the valve body, the valve rod is arranged in the valve body and connected with the valve plate, and one end of the valve rod penetrates through the end of the valve body. The number of the packing boxes is two, the two packing boxes are symmetrically arranged at the two ends of the valve body, the packing boxes are located between the valve body and the valve rod, and a mounting cavity is formed between the inner wall of each packing box and the outer wall of the valve rod; the number of the sealing and supporting assemblies is two, and the two sealing and supporting assemblies are symmetrically arranged in a mounting cavity formed by the two packing boxes correspondingly. At least part of the packing box is exposed out of the valve body and is detachably connected with the valve body; according to the butterfly valve, spare parts at the two ends of the valve body are consistent in structure, the service life is prolonged, meanwhile, the internal sealing and supporting assembly is easy to disassemble and replace, and the maintenance difficulty is greatly reduced.

Description

Technical Field

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

[0002] A butterfly valve is a type of valve widely used in industrial pipeline systems. Its valve plate is installed in the center of the valve body, and the rotation axis of the valve plate is perpendicular to the pipeline axis. The valve plate is rotated by the valve stem, so that the valve plate can be rotated from a direction perpendicular to the pipeline to a direction parallel to the pipeline, thereby realizing the change of the valve from a fully closed state to a fully open state.

[0003] Most butterfly valves on the market currently have the following structure: the upper structure consists of a packing plate, packing, and an upper bushing, while the lower structure consists of a lower bushing and a bottom end cap. With prolonged use, the upper and lower structures of these existing butterfly valve structures are prone to varying degrees of wear, resulting in a relatively short valve lifespan. Furthermore, due to the limited space, disassembling and replacing spare parts such as packing and bushings is extremely inconvenient, hindering valve inspection and maintenance. Utility Model Content

[0004] This application aims to provide a butterfly valve that solves the problems of short valve life and difficulty in inspection and maintenance in the prior art.

[0005] A butterfly valve includes: a valve body, a valve plate, a valve stem, a packing box, and a sealing and support assembly; the valve plate is disposed at the center of the valve body, the valve stem is disposed inside the valve body and connected to the valve plate, and one end of the valve stem passes through the end of the valve body; the number of packing boxes is set to two, and the two packing boxes are symmetrically disposed at both ends of the valve body, the packing boxes are located between the valve body and the valve stem, and an installation cavity is formed between the inner wall of the packing box and the outer wall of the valve stem; the number of sealing and support assemblies is set to two sets, and the two sets of sealing and support assemblies are respectively disposed in the installation cavity formed by the two packing boxes and are symmetrically disposed; at least a portion of the packing box is exposed outside the valve body and is detachably connected to the valve body.

[0006] Optionally, the sealing and support assembly includes a bushing, a support bearing, and packing; the packing box includes a shaft sleeve and a flanged structure, the shaft sleeve is fitted between the valve body and the valve stem, and the mounting cavity is formed between the inner wall of the shaft sleeve and the outer wall of the valve stem; the flanged structure is disposed at the end of the shaft sleeve and extends radially outward from the shaft sleeve; the flanged structure is located outside the valve body and is detachably connected to the valve body; along the axial direction of the valve stem, from the middle of the valve stem to the end of the valve stem, the bushing, the support bearing, and the packing are sequentially installed in the mounting cavity.

[0007] Optionally, a spacer is provided between the packing and the supporting bearing.

[0008] Optionally, the butterfly valve further includes a sealing ring disposed on the side of the packing box facing the middle of the valve stem, the sealing ring tightly filling the space between the valve stem and the valve body.

[0009] Optionally, the sealing ring has one or more bolt holes on the side facing the end of the valve stem.

[0010] Optionally, both ends of the valve body are provided with packing clamping members, which are connected to the valve body and abut against the packing.

[0011] Optionally, the packing clamping component includes a packing plate and a packing ring. The packing ring is disposed at one end of the packing plate facing the valve body, and an elastic element is disposed between the packing plate and the packing ring. The packing plate is bolted to the valve body, the elastic element is pressed against the packing plate and the packing ring, and the end of the packing ring away from the packing plate presses against the packing.

[0012] Optionally, the elastic element includes a disc spring.

[0013] Beneficial effects:

[0014] The butterfly valve described in this application includes: a valve body, a valve plate, a valve stem, a packing box, and a sealing and support assembly; the valve plate is disposed at the center of the valve body, the valve stem is disposed inside the valve body and connected to the valve plate, and one end of the valve stem passes through the end of the valve body; the number of packing boxes is set to two, and the two packing boxes are symmetrically disposed at both ends of the valve body, the packing boxes are located between the valve body and the valve stem, and an installation cavity is formed between the inner wall of the packing box and the outer wall of the valve stem; the number of sealing and support assemblies is set to two sets, and the two sets of sealing and support assemblies are respectively disposed in the installation cavity formed by the two packing boxes and are symmetrically disposed; at least a portion of the packing box is exposed outside the valve body and is detachably connected to the valve body. In this application, two stuffing boxes and two sets of sealing and support components are symmetrically arranged, and the spare parts at both ends of the valve have the same structure. On the one hand, this reduces the processing difficulty and helps to ensure consistent processing accuracy. On the other hand, it can reduce the difference in the degree of wear of the valve structure at both ends during subsequent use, thereby improving the overall service life of the valve. In addition, with the stuffing box, the internal packing, bushing and other sealing and support components are very easy to disassemble and replace, which reduces the difficulty of valve inspection and maintenance and improves replacement efficiency. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of a butterfly valve according to an embodiment of this application;

[0017] Figure 2 This is a schematic diagram of the structure of the first end of a butterfly valve according to an embodiment of this application;

[0018] Figure 3 This is a schematic diagram of the structure of the second end of a butterfly valve according to an embodiment of this application.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1. Valve body; 2. Valve plate; 3. Valve stem; 4. Stuffing box; 4a. Upper stuffing box; 4b. Lower stuffing box; 5. Sealing and support assembly; 5a. Upper sealing and support assembly; 5b. Lower sealing and support assembly; 51a. Upper bushing; 51b. Lower bushing; 52a. Upper support bearing; 52b. Lower support bearing; 53a. Upper packing; 53b. Lower packing; 6. Separator gasket; 7. Sealing ring; 7a. Upper sealing ring; 7b. Lower sealing ring; 8. Packing clamping component; 8a. Upper packing clamping component; 8b. Lower packing clamping component; 81a. Upper packing pressure plate; 81b. Lower packing pressure plate; 82a. Upper packing pressure ring; 82b. Lower packing pressure ring; 83a. Upper elastic element; 83b. Lower elastic element. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] In related technologies, butterfly valves are widely used in industrial pipeline systems. The valve plate is installed at the center of the valve body, and the rotation axis of the valve plate is perpendicular to the pipeline axis. The valve plate is rotated by the valve stem, so that the valve plate can be rotated from a direction perpendicular to the pipeline to a direction parallel to the pipeline, thereby realizing the change of the valve from a fully closed state to a fully open state.

[0023] Most butterfly valves on the market currently have the following structure: the upper structure consists of a packing plate, packing, and an upper bushing, while the lower structure consists of a lower bushing and a bottom end cap. Due to the inconsistency in the structure of the spare parts at both ends of the valve, existing butterfly valves are prone to varying degrees of wear in both the upper and lower structures after long-term use, resulting in a relatively short valve lifespan. Furthermore, the narrow space between the valve body and stem makes disassembly and replacement of spare parts such as packing and bushings very inconvenient, hindering valve inspection and maintenance.

[0024] In view of this, this application proposes a butterfly valve.

[0025] See Figure 1 A butterfly valve includes: a valve body 1, a valve plate 2, a valve stem 3, a packing box 4, and a sealing and support assembly 5; the valve plate 2 is disposed at the center of the valve body 1, the valve stem 3 is disposed inside the valve body 1 and connected to the valve plate 2, and one end of the valve stem 3 penetrates through the end of the valve body 1; the number of packing boxes 4 is set to two, and the two packing boxes 4 are symmetrically disposed at both ends of the valve body 1, the packing boxes 4 are located between the valve body 1 and the valve stem 3, and an installation cavity is formed between the inner wall of the packing box 4 and the outer wall of the valve stem 3; the number of sealing and support assemblies 5 is set to two sets, and the two sets of sealing and support assemblies 5 are respectively disposed in the installation cavity formed by the two packing boxes 4 and are symmetrically disposed; at least a portion of the packing box 4 is exposed outside the valve body 1 and is detachably connected to the valve body 1.

[0026] Specifically, the valve plate 2 of the butterfly valve is located at the center of the valve body 1 and is generally circular in shape. The valve stem 3 is installed inside the valve body 1 along the radial direction of the valve plate 2. The valve stem 3 is connected to the valve plate 2. One end of the valve stem 3 extends through the end of the valve body 1 to connect to the actuator. The actuator can drive the valve stem 3 to rotate around its axis, thereby driving the valve plate 2 to rotate, and finally realizing the opening or closing of the valve.

[0027] There are two packing boxes 4: an upper packing box 4a and a lower packing box 4b. The upper and lower packing boxes 4a and 4b have identical structures and are symmetrically arranged at both ends of the valve body 1. The packing box 4 is located between the valve body 1 and the valve stem 3. A gap exists between the inner wall of the packing box 4 and the outer wall of the valve stem 3, forming a mounting cavity for installing the sealing and support assembly 5. Two sets of sealing and support assemblies 5 are also provided, installed in the mounting cavities formed by the upper and lower packing boxes 4a and 4b respectively. Both sets of sealing and support assemblies 5 also have identical structures and are symmetrically arranged. Therefore, the spare parts structure at both ends of the valve, i.e. Figure 1The spare parts structures at the top and bottom of the valve shown are completely identical. On the one hand, during the manufacturing stage, the identical spare parts structure and machining reference points reduce the difficulty of machining, ensuring machining accuracy and thus extending the valve's service life. On the other hand, during subsequent use, because the spare parts structures at both ends of the valve are identical, the wear levels of the spare parts at both ends tend to be consistent, preventing situations where excessive wear differences at both ends could affect normal use, effectively extending the valve's service life.

[0028] Since both the sealing and support components 5 are installed in the packing box 4, and at least a portion of the structure of the packing box 4 is exposed outside the valve body 1, and the packing box 4 and the valve body 1 are detachably connected, when it is necessary to disassemble or replace the internal sealing and support components 5, the packing box 4 can be removed from the valve body 1 by operating from outside the valve body 1, thus bringing the sealing and support components 5 out of the valve body 1 at the same time, and then the sealing and support components 5 can be removed from the packing box 4. Similarly, during installation, it is only necessary to first install the sealing and support components 5 into the packing box 4, and then install the packing box 4 onto the valve body 1. Compared with the conventional butterfly valve structure, this embodiment eliminates the inconvenience of operating in a narrow space when replacing spare parts such as packing and bushings, and the disassembly and replacement operations are simple and convenient, greatly reducing the difficulty of valve inspection and maintenance and improving replacement efficiency.

[0029] Optionally, the sealing and support assembly 5 includes a bushing, a support bearing, and packing; the packing box 4 includes a shaft sleeve and a flange structure, the shaft sleeve is fitted between the valve body 1 and the valve stem 3, and the mounting cavity is formed between the inner wall of the shaft sleeve and the outer wall of the valve stem 3; the flange structure is disposed at the end of the shaft sleeve and extends radially outward from the shaft sleeve; the flange structure is located outside the valve body 1 and is detachably connected to the valve body 1; along the axial direction of the valve stem 3, from the middle of the valve stem 3 to the end of the valve stem 3, the bushing, the support bearing, and the packing are sequentially installed in the mounting cavity.

[0030] Specifically, Figure 2 The internal structure of the first end (i.e., the upper part of the butterfly valve) is shown. Figure 3 The internal structure of the second end (i.e., the lower part of the butterfly valve) of the butterfly valve is shown.

[0031] See Figure 2The upper stuffing box 4a includes a shaft sleeve and a flanged structure. The shaft sleeve is fitted between the valve body 1 and the valve stem 3 and is coaxial with the valve stem 3. The flanged structure is located at the upper end of the shaft sleeve and extends radially outward from the shaft sleeve. Due to the flanged structure, when the upper stuffing box 4a is installed on the upper part of the valve body 1, the shaft sleeve extends into the valve body 1, while the lower end face of the flanged structure abuts against the upper end face of the valve body 1, thus placing the flanged structure outside the valve body 1. The flanged structure is detachably connected to the valve body 1, allowing for easy operation outside the valve body 1 when disassembling the upper stuffing box 4a. See also Figure 3 The lower stuffing box 4b is arranged symmetrically with the upper stuffing box 4a at the lower part of the valve body 1. The structure of the lower stuffing box 4b is the same as that of the upper stuffing box 4a, so it will not be described in detail here.

[0032] The two sets of sealing and support assemblies 5 are the upper sealing and support assembly 5a and the lower sealing and support assembly 5b. See also... Figure 2 The upper sealing and support assembly 5a includes an upper bushing 51a, an upper support bearing 52a, and an upper packing 53a. An upper mounting cavity is formed between the inner wall of the shaft cylinder of the upper packing box 4a and the outer wall of the valve stem 3. The upper bushing 51a, the upper support bearing 52a, and the upper packing 53a are installed in the upper mounting cavity from bottom to top. Specifically, the upper mounting cavity can be divided into a first sub-cavity and a second sub-cavity. The first sub-cavity is used to install the upper bushing 51a, whose shape and size are adapted to the upper bushing 51a. The upper bushing 51a isolates the valve stem 3 and the valve body 1, reducing friction between the valve stem 3 and the valve body 1 during rotation, reducing wear, and preventing impurities and dust in the medium from entering the gap between the valve stem 3 and the valve body 1. The second sub-cavity is used to install the upper support bearing 52a and the upper packing 53a, whose shape and size are adapted to the upper support bearing 52a. The upper support bearing 52a provides radial and axial support for the valve stem 3, and also reduces friction between the valve stem 3 and the valve body 1 during valve operation, helping to improve the valve's wear resistance and pressure bearing capacity. The upper packing 53a is installed on top of the upper support bearing 52a and is usually made of soft material. It plays a sealing role, preventing the medium from leaking from the gap between the valve stem 3 and the valve body 1, ensuring the valve's sealing performance.

[0033] See Figure 3The lower sealing and support assembly 5b is arranged symmetrically with the upper sealing and support assembly 5a at the lower part of the valve body 1. Specifically, the lower sealing and support assembly 5b includes a lower bushing 51b, a lower support bearing 52b, and a lower packing 53b. A lower mounting cavity is formed between the inner wall of the shaft section of the lower packing box 4b and the outer wall of the valve stem 3. The lower bushing 51b, the lower support bearing 52b, and the lower packing 53b are installed sequentially from top to bottom within the lower mounting cavity. The lower mounting cavity also includes a first sub-cavity and a second sub-cavity. The first sub-cavity is used to install the lower bushing 51b, and the second sub-cavity is used to install the lower support bearing 52b and the lower packing 53b.

[0034] The structure and function of the lower bushing 51b, lower support bearing 52b, and lower packing 53b are the same as the corresponding parts in the upper sealing and support assembly 5a, and will not be described in detail here. In practical applications, identical parts in the two sets of sealing and support assemblies 5 are selected with exactly the same model or material to ensure that the spare parts structure at both ends of the valve body 1 is completely consistent, thereby ensuring machining accuracy, improving the versatility and adaptability of spare parts, and ensuring the service life of the valve.

[0035] Optionally, a spacer 6 is provided between the packing and the supporting bearing.

[0036] Specifically, a spacer 6 is provided between the upper packing 53a and the upper support bearing 52a, and between the lower packing 53b and the lower support bearing 52b. By providing the spacer 6, direct contact between the packing and the support bearing can be prevented, thereby reducing friction and extending the service life of the support bearing.

[0037] Optionally, the butterfly valve further includes a sealing ring 7, which is disposed on the side of the packing box 4 facing the middle of the valve stem 3, and the sealing ring 7 tightly fills the space between the valve stem 3 and the valve body 1.

[0038] Specifically, a sealing ring 7 is also provided between the valve body 1 and the valve stem 3. To ensure that the spare parts at both ends of the valve body 1 have consistent structures, two sets of sealing rings 7 are provided: an upper sealing ring 7a and a lower sealing ring 7b. See also Figure 2 The upper sealing ring 7a is located at the lower end of the upper stuffing box 4a. The inner side of the upper sealing ring 7a is tightly fitted with the outer wall of the upper end of the valve stem 3, and the outer side of the upper sealing ring 7a is tightly fitted with the inner wall of the upper end of the valve body 1. Thus, the upper sealing ring 7a tightly fills the gap between the upper end of the valve body 1 and the upper end of the valve stem 3, which can prevent impurities and dust in the medium from entering from the upper gap, further improving the sealing performance of the valve.

[0039] See Figure 3The lower sealing ring 7b is symmetrically arranged at the lower end of the valve body 1 with the upper sealing ring 7a, located at the upper end of the lower packing box 4b. The inner side of the lower sealing ring 7b is tightly fitted with the outer wall of the lower end of the valve stem 3, and the outer side of the lower sealing ring 7b is tightly fitted with the inner wall of the lower end of the valve body 1. Thus, the lower sealing ring 7b tightly fills the gap between the lower end of the valve body 1 and the lower end of the valve stem 3, preventing impurities and dust in the medium from entering from the lower gap, and further improving the sealing performance of the valve.

[0040] In this embodiment, the number of upper sealing ring 7a and lower sealing ring 7b is set to one. In other embodiments, the number of sealing rings 7 can be increased according to actual sealing requirements, and the number of upper sealing ring 7a and lower sealing ring 7b remains the same.

[0041] Optionally, the sealing ring 7 has one or more bolt holes on the side facing the end of the valve stem 3.

[0042] Specifically, since the sealing ring 7 is installed in the gap between the valve stem 3 and the valve body 1, the space is very small. To further facilitate the disassembly of the sealing ring 7, multiple bolt holes are provided on the side of the sealing ring 7 facing the end of the valve stem 3. Specifically, the bolt holes of the upper sealing ring 7a are located on its upper side. When it is necessary to disassemble the upper sealing ring 7a, first remove the upper packing box 4a, then use a tool to screw bolts into the bolt holes of the upper sealing ring 7a. The bottom of the bolt connects with the upper sealing ring 7a through the thread engagement with the bolt hole. Finally, by dragging the bolt outward, the upper sealing ring 7a can be brought out to the outside of the valve body 1, thus achieving the disassembly of the upper sealing ring 7a. The bolt holes of the lower sealing ring 7b are located on its lower side. Its disassembly process is similar to that of the upper sealing ring 7a, and will not be described in detail here.

[0043] Optionally, both ends of the valve body 1 are provided with packing clamping members 8, which are connected to the valve body 1 and abut against the packing.

[0044] Specifically, both ends of the valve body 1 are provided with packing clamping parts 8. The upper packing clamping part 8a is provided at the upper end of the valve body 1 and is connected to the upper end of the valve body 1 to cooperate in clamping the upper packing 53a. The lower packing clamping part 8b is provided at the lower end of the valve body 1 and is connected to the lower end of the valve body 1 to cooperate in clamping the lower packing 53b.

[0045] Optionally, the packing clamping member 8 includes a packing pressure plate and a packing pressure ring. The packing pressure ring is disposed at one end of the packing pressure plate facing the valve body 1. An elastic element is disposed between the packing pressure plate and the packing pressure ring. The packing pressure plate is bolted to the valve body 1. The elastic element is pressed against the packing pressure plate and the packing pressure ring. The end of the packing pressure ring away from the packing pressure plate is pressed against the packing.

[0046] For details, see Figure 2 The upper packing clamping component 8a includes an upper packing pressure plate 81a and an upper packing pressure ring 82a. The upper packing pressure plate 81a is located at the upper end of the upper packing pressure ring 82a. An upper elastic component 83a is provided between the upper packing pressure plate 81a and the upper packing pressure ring 82a. The upper packing pressure plate 81a is bolted to the upper end of the valve body 1. The upper elastic component 83a is pressed between the upper packing pressure plate 81a and the upper packing pressure ring 82a. The lower end of the upper packing pressure ring 82a presses against the upper packing 53a to ensure the sealing performance of the upper packing 53a.

[0047] See Figure 3 The lower packing clamping component 8b includes a lower packing pressure plate 81b and a lower packing pressure ring 82b. The lower packing pressure plate 81b is located at the lower end of the lower packing pressure ring 82b. A lower elastic component 83b is provided between the lower packing pressure plate 81b and the lower packing pressure ring 82b. The lower packing pressure plate 81b is bolted to the lower end of the valve body 1. The lower elastic component 83b is pressed between the lower packing pressure plate 81b and the lower packing pressure ring 82b. The upper end of the lower packing pressure ring 82b presses against the lower packing 53b to ensure the sealing performance of the lower packing 53b.

[0048] Because of the upper elastic element 83a and the lower elastic element 83b, both the upper packing ring 82a and the lower packing ring 82b have a small amount of axial movement. This means that even if the upper packing 53a or the lower packing 53b loosens or wears out during subsequent use, the packing rings can still tighten the packing under the elastic force of the corresponding elastic elements, ensuring sealing performance. Therefore, by incorporating elastic elements, the automatic adjustment capability of the packing clamping element 8 for the packing seal is improved.

[0049] Optionally, in this embodiment, both the upper elastic element 83a and the lower elastic element 83b can be disc springs.

[0050] In this embodiment, since the upper end of the valve stem 3 needs to extend through the valve body 1 to connect with the actuator, a through hole is provided in the upper packing clamping member 8a at the location corresponding to the valve stem 3 to ensure that the upper end of the valve stem 3 can pass through. Specifically, through holes are provided in the middle of the upper packing pressure plate 81a and the upper elastic member 83a, and the diameter of the through hole and the inner diameter of the upper packing pressure ring 82a are adapted to the outer diameter of the upper end of the valve stem 3. Since the lower end of the valve stem 3 does not need to extend beyond the valve body 1 to connect with the external mechanism, a through hole is not required in the lower packing clamping member 8b.

[0051] The butterfly valve described in this application embodiment can be installed horizontally or vertically. The installation process for the spare parts at both ends of the valve is the same. Taking one end as an example, first install the sealing ring 7, then sequentially install the bushing, support bearing, and packing into the packing box 4. Next, install the assembled packing box 4 into the valve body 1, and finally install the packing clamping member 8 to compress the packing with the packing ring. When disassembly is required, first remove the packing clamping member 8, then remove the packing box 4 from the valve body 1 and sequentially remove the packing, support bearing, and bushing from the packing box 4. Finally, remove the sealing ring 7 from the valve body 1.

[0052] The butterfly valve described in this application adopts two stuffing boxes and two sets of sealing and support components symmetrically arranged. The spare parts at both ends of the valve have the same structure, which reduces the processing difficulty and helps to ensure consistent processing accuracy. On the other hand, it can reduce the difference in the degree of wear of the valve structure at both ends during subsequent use, thereby improving the overall service life of the valve. In addition, with the stuffing box setting, the internal packing, bushing and other sealing and support components are very easy to disassemble and replace, which greatly reduces the difficulty of valve inspection and maintenance and improves the efficiency of spare parts replacement.

[0053] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0054] It should also be noted that, in this document, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations, nor should they be construed as indicating or implying relative importance. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements, but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. In the absence of further restrictions, an element defined by the phrase "includes a..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes the element.

[0055] The technical solutions provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand this application, and the content of this specification should not be construed as a limitation of this application. Furthermore, for those skilled in the art, there will be different forms of changes in the specific implementation methods and application scope based on this application. It is neither necessary nor possible to exhaustively list all implementation methods here, and obvious changes or modifications derived therefrom are still within the protection scope of this application.

Claims

1. A butterfly valve, characterized in that, include: Valve body, valve plate, valve stem, stuffing box, sealing and support components; The valve plate is located at the center of the valve body, the valve stem is located inside the valve body and connected to the valve plate, and one end of the valve stem passes through the end of the valve body; The number of packing boxes is set to two, and the two packing boxes are symmetrically arranged at both ends of the valve body. The packing boxes are located between the valve body and the valve stem, and an installation cavity is formed between the inner wall of the packing box and the outer wall of the valve stem. The number of the sealing and support components is set to two sets, and the two sets of sealing and support components are respectively arranged in the mounting cavity formed by the two packing boxes and are symmetrically arranged; At least a portion of the packing box is exposed to the outside of the valve body and is detachably connected to the valve body.

2. The butterfly valve according to claim 1, characterized in that: The sealing and support assembly includes a bushing, a support bearing, and packing. The stuffing box includes a cylindrical section and a flanged structure. The cylindrical section is fitted between the valve body and the valve stem, and the mounting cavity is formed between the inner wall of the cylindrical section and the outer wall of the valve stem. The flanged structure is disposed at the end of the cylindrical section and extends radially outward from the cylindrical section. The flanged structure is located outside the valve body and is detachably connected to the valve body. Along the axial direction of the valve stem, from the middle of the valve stem to the end of the valve stem, the bushing, the support bearing, and the packing are sequentially installed in the mounting cavity.

3. The butterfly valve according to claim 2, characterized in that: A spacer is provided between the packing and the supporting bearing.

4. The butterfly valve according to claim 2, characterized in that: It also includes a sealing ring disposed on the side of the packing box facing the middle of the valve stem, the sealing ring tightly filling the space between the valve stem and the valve body.

5. The butterfly valve according to claim 4, characterized in that: The sealing ring has one or more bolt holes on the side facing the end of the valve stem.

6. The butterfly valve according to claim 2, characterized in that: Both ends of the valve body are provided with packing clamping members, which are connected to the valve body and abut against the packing.

7. The butterfly valve according to claim 6, characterized in that: The packing clamping component includes a packing plate and a packing ring. The packing ring is disposed at one end of the packing plate facing the valve body, and an elastic element is disposed between the packing plate and the packing ring. The packing pressure plate is bolted to the valve body, the elastic element is pressed between the packing pressure plate and the packing pressure ring, and the end of the packing pressure ring away from the packing pressure plate is pressed against the packing.

8. The butterfly valve according to claim 7, characterized in that: The elastic element includes a disc spring.

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