Butterfly valve capable of being installed stably

Abstract

The utility model belongs to the field of valves, particularly relates to a stably-mounted butterfly valve, and aims to solve the problems of failure risk of packing seal, insufficient mechanical structure stability, poor mounting redundancy of a sealing component, weak anti-drop capability of a sealing ring and influence on fluid control precision in the prior art. The utility model provides the following scheme: the butterfly valve comprises a valve body, and a through valve rod mounting hole is formed in the top of the valve body; the valve rod is rotationally mounted in the valve rod mounting hole, and the outer wall of the valve rod is fixedly sleeved with a butterfly plate through a positioning pin; the upper shaft sleeve and the lower shaft sleeve are arranged on the outer wall of the valve rod in a sleeved mode and located at the top and the bottom of the valve body respectively, in order to guarantee the stability of the filler pressing plate, the two protective shells are moved to the two sides of the filler pressing plate from the two sides, the filler pressing plate is sealed and covered, the filler pressing plate can be prevented from shaking, then the steel plate support is installed, and therefore the filler pressing plate is prevented from shaking. And the limiting groove is clamped with the two limiting blocks, so that the protective shells can be limited, the two protective shells are prevented from loosening, and then the mounting stability of the filler pressing plate can be guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a butterfly valve that is securely installed. Background Technology

[0002] In the field of industrial fluid control, butterfly valves are widely used in industries such as petroleum, chemical, power, and water treatment due to their advantages such as compact structure, rapid opening and closing, and excellent regulating performance. However, traditional butterfly valves often face the following technical challenges during long-term operation:

[0003] Packing seal failure risk: The dynamic seal between the valve stem and the valve body is prone to leakage due to medium corrosion, high pressure impact or packing aging. Especially under high temperature, high pressure or strong corrosive conditions, the reduction of packing preload will directly threaten the reliability of valve sealing.

[0004] Insufficient mechanical structural stability: When the packing plate is directly fixed by bolts, it is easily loosened by vibration or thermal stress, which can lead to valve stem misalignment, increased wear on the sealing surface, and even serious accidents such as valve stem breakage.

[0005] Poor installation redundancy of sealing components: In the existing technology, the packing seal and valve body sealing components are mostly independent modules, lacking a coordinated anti-loosening design, which leads to valve maintenance requiring multiple disassembly and assembly, resulting in low efficiency and easy introduction of secondary leakage risk.

[0006] The sealing ring has weak resistance to detachment: the butterfly plate sealing ring is prone to detachment due to medium erosion or deformation under high pressure differential or frequent opening and closing, causing the valve body and butterfly plate to fail to seal, affecting the accuracy of fluid control.

[0007] To address the aforementioned issues, this application proposes a robustly installed butterfly valve that systematically solves the reliability bottleneck of traditional butterfly valves through innovative sealing components, stabilizing components, and a sealing ring anti-detachment structure design. Utility Model Content

[0008] The purpose of this invention is to address the risks of packing seal failure in existing technologies: the dynamic seal between the valve stem and body is prone to leakage due to media corrosion, high-pressure impact, or packing aging, especially under high temperature, high pressure, or highly corrosive conditions, where the decrease in packing preload directly threatens the reliability of the valve seal. Insufficient mechanical structural stability: when the packing pressure plate is directly fixed with bolts, it is easily loosened by vibration or thermal stress, leading to valve stem misalignment, accelerated wear of the sealing surface, and even serious accidents such as valve stem breakage. Poor installation redundancy of sealing components: in existing technologies, the packing seal and valve body sealing components are mostly independent modules, lacking a coordinated anti-loosening design, resulting in repeated disassembly and assembly for valve maintenance, which is inefficient and easily introduces the risk of secondary leakage. Weak resistance to seal detachment: the butterfly plate seal ring is prone to detachment due to media erosion or deformation under high pressure differential or frequent opening and closing, causing valve body and butterfly plate seal failure and affecting fluid control accuracy. Therefore, this invention proposes a robustly installed butterfly valve.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A securely mounted butterfly valve includes a valve body with a through-hole for mounting the valve stem at the top.

[0011] The valve stem is rotatably installed in the valve stem mounting hole, and its outer wall is fixedly fitted with a butterfly plate by a positioning pin.

[0012] The upper bushing and the lower bushing are respectively fitted onto the outer wall of the valve stem and located at the top and bottom of the valve body, and are used to support the rotation of the valve stem;

[0013] A sealing assembly, located above the upper bushing, includes a packing gasket, a packing body, a packing sleeve, and a packing pressure plate, which are sequentially fitted onto the outer wall of the valve stem from bottom to top. The packing pressure plate is fixed to the top of the valve body by a pressure cap bolt, and is used to achieve dynamic sealing between the valve stem and the valve body.

[0014] The stabilizing component includes two symmetrically arranged protective shells. The top of each protective shell has a clearance hole to avoid the valve stem, and the bottom inner wall is provided with a pressure block. The bottom of the pressure block abuts against the top of the packing pressure plate to limit the shaking of the packing pressure plate.

[0015] A steel plate bracket is fixedly installed on the top of the valve body by bracket bolts and fixing nuts. Limiting grooves are opened at the bottom of the two side ear plates. Limiting blocks are provided on both sides of the protective shell. The limiting blocks engage with the limiting grooves to limit the loosening of the protective shell.

[0016] Metal spiral wound gaskets are fixedly installed on both sides of the valve body by internal hex bolts to achieve a static seal between the valve body and the pipeline flange.

[0017] A sealing ring is fixedly sleeved on the outer wall of the butterfly plate and cooperates with the valve seat pressure plate on the inner wall of the valve body to achieve dynamic sealing between the butterfly plate and the valve body.

[0018] The positioning adjustment sleeve is installed on the inner wall of the valve body via an adjustment screw and is used to adjust the opening and closing stroke of the valve stem;

[0019] Rotating the valve stem causes the butterfly plate to rotate, and the sealing assembly and the sealing ring enable normal fluid transport and zero leakage. The stabilizing assembly, through a three-level protection system of the protective shell, the pressure block and the steel plate support, ensures the installation stability of the packing pressure plate and avoids leakage and loosening.

[0020] In one possible design, the packing body is made of flexible graphite or PTFE material. The rigid constraints of the packing sleeve and the packing plate enable the long-term maintenance of the dynamic sealing preload, adapting to different media characteristics.

[0021] In one possible design, the valve seat pressure plate mechanically restricts the sealing ring to the outer wall of the butterfly plate, preventing the sealing ring from shifting due to high pressure differential or high-frequency opening and closing, which is especially suitable for harsh working conditions containing particulate media.

[0022] In one possible design, both the gland bolt and the bracket bolt are secured with double nuts or thread-locking adhesive to meet the anti-loosening requirements for high-strength bolts in GB / T 3098.1 standard and are suitable for vibration conditions.

[0023] In one possible design, the sealing assembly can be pre-assembled and then installed as a whole. The protective shell and the steel plate bracket can be quickly aligned with the limiting block through the limiting groove, reducing on-site debugging time.

[0024] In one possible design, when the packing body ages, it is only necessary to loosen the gland bolts and remove the protective shell, without damaging the valve body or the valve stem structure, thus reducing maintenance costs by more than 40%.

[0025] In one possible design, the valve body is connected to the metal spiral wound gasket and the tail cap using standard flanges or threaded interfaces, which are compatible with existing industrial piping systems and reduce the difficulty of modification.

[0026] In one possible design, the opening and closing stroke of the valve stem can be precisely controlled by adjusting the axial position of the positioning adjustment sleeve by adjusting the adjusting screw, thus adapting to the output characteristics of different drive mechanisms (electric, pneumatic, manual).

[0027] In one possible design, the positioning adjustment sleeve is mechanically matched with the valve stem to prevent valve overtravel caused by abnormal control signals and to protect the sealing assembly from impact damage.

[0028] In this application, during use, the valve stem can be rotated, which can drive the butterfly plate to rotate. After the state of the butterfly plate is adjusted, the opening and closing state of the valve can be adjusted and switched to achieve normal fluid transportation. Furthermore, due to the setting of the packing body, the sealing performance of the device can be improved. The sealing performance is further improved by the sealing ring at the bottom of the device.

[0029] After installing the packing pressure plate using the gland bolts, to ensure its stability, the two protective shells are moved from both sides to the sides of the packing pressure plate. This seals the packing pressure plate, with the bottom of the pressure block pressing against the top of the packing pressure plate to prevent it from shaking. Then, the steel plate bracket is installed, with the limiting groove engaging with the two limiting blocks to limit the protective shells and prevent them from loosening, thus ensuring the stability of the packing pressure plate installation.

[0030] Beneficial effects:

[0031] Packing seal enhancement:

[0032] The composite sealing structure consists of packing gaskets, packing body, and packing gland. The packing body can be made of flexible graphite, PTFE, or other materials to adapt to different media characteristics. The packing gland achieves long-term maintenance of dynamic sealing preload through the rigid constraint of the packing pressure plate and gland bolts.

[0033] Valve body sealing redundancy design:

[0034] The valve body achieves static sealing of the flange face through metal spiral wound gaskets and internal hex bolts on both sides. Combined with the sealing ring on the outer wall of the butterfly plate and the valve seat pressure plate on the inner wall of the valve body, a double dynamic seal is formed to ensure zero leakage of the medium.

[0035] Sealing ring anti-dislodgement mechanism:

[0036] The valve seat pressure plate mechanically restricts the sealing ring to the outer wall of the butterfly plate, preventing the sealing ring from shifting due to high pressure differential or high frequency opening and closing, which is especially suitable for harsh working conditions containing particulate media.

[0037] Packing pressure plate rigidly fixed:

[0038] A three-level protection system is formed by a protective shell, pressure blocks, and steel plate supports:

[0039] Protective housing: symmetrically arranged on both sides, with a clearance hole at the top to avoid the valve stem, and a pressure block at the bottom to directly press the packing plate, eliminating the risk of lateral displacement;

[0040] The limiting groove and the limiting block engage: The limiting blocks on both sides of the protective shell are embedded in the limiting groove of the steel plate bracket to form a mechanical interlock and prevent the protective shell from loosening;

[0041] Rigid connection of steel plate bracket: The bracket bolts pass through the ear plate and are threaded to the valve body. The fixing nut is tightened to achieve rigid integration of the protective shell and the valve body.

[0042] Vibration-resistant and anti-loosening design:

[0043] Both the gland bolts and the bracket bolts are secured with double nuts or thread-locking adhesive to meet the anti-loosening requirements for high-strength bolts in GB / T 3098.1 standard and are suitable for vibration conditions.

[0044] Quick assembly of sealing components:

[0045] The packing seal module can be pre-assembled and then installed as a whole. The protective shell and steel plate bracket can be quickly aligned through the limiting groove and the limiting block, reducing on-site commissioning time.

[0046] Maintenance without disassembly:

[0047] When the packing body ages, it is only necessary to loosen the gland bolts and remove the protective shell, without damaging the valve body or valve stem structure, thus reducing maintenance costs by more than 40%.

[0048] Standardized interface design:

[0049] The valve body is connected to the metal spiral wound gasket and the tail cap using standard flanges or threaded interfaces, which are compatible with existing industrial piping systems and reduce the difficulty of modification.

[0050] By adjusting the axial position of the positioning and adjusting sleeve by adjusting the screw, the opening and closing stroke of the valve stem can be precisely controlled, adapting to the output characteristics of different drive mechanisms (electric, pneumatic, manual).

[0051] The positioning and adjusting sleeve is mechanically matched with the valve stem to prevent the valve from overtravel due to abnormal control signals and to protect the sealing components from impact damage. Attached Figure Description

[0052] Figure 1 This is a three-dimensional structural diagram of a butterfly valve that can be installed securely according to this utility model.

[0053] Figure 2 This is a schematic diagram of the main structure of a securely installed butterfly valve proposed in this utility model.

[0054] Figure 3 This is a side sectional view of a butterfly valve that is securely installed according to the present invention.

[0055] Figure 4 This is a three-dimensional structural diagram of Embodiment 2 of the butterfly valve proposed in this utility model;

[0056] Figure 5 This is an exploded view of the protective shell in Embodiment 2 of a butterfly valve with a secure installation proposed in this utility model.

[0057] In the diagram: 1. Clearance hole; 2. Tail cap; 3. Spiral wound metal gasket; 4. Valve body; 5. Lower bushing; 6. Valve seat pressure plate; 7. Sealing ring; 8. Valve stem; 9. Butterfly plate; 10. Locating pin; 11. Locating adjustment sleeve; 12. Upper bushing; 13. Packing gasket; 14. Packing body; 15. Packing sleeve; 16. Packing pressure plate; 17. Bracket bolt; 18. Steel plate bracket; 19. Hex socket head cap bolt; 20. Cover bolt; 21. Protective shell; 22. Limiting block; 23. Pressure block; 24. Fixing nut; 25. Limiting groove; 26. Ear plate. Detailed Implementation

[0058] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0059] Example 1

[0060] Reference Figure 1-5 A butterfly valve includes a valve body 4 with a through valve stem mounting hole at the top;

[0061] The valve stem 8 is rotatably installed in the valve stem mounting hole, and the butterfly plate 9 is fixedly sleeved on its outer wall by the positioning pin 10.

[0062] The upper bushing 12 and the lower bushing 5 are respectively sleeved on the outer wall of the valve stem 8 and located at the top and bottom of the valve body 4 to support the rotation of the valve stem 8.

[0063] The sealing assembly, located above the upper bushing 12, includes, from bottom to top, a packing gasket 13, a packing body 14, a packing sleeve 15, and a packing pressure plate 16, all sequentially fitted onto the outer wall of the valve stem 8. The packing pressure plate 16 is fixed to the top of the valve body 4 by gland bolts 20, achieving dynamic sealing between the valve stem 8 and the valve body 4. The packing body 14 is made of flexible graphite or PTFE material. The rigid constraints of the packing sleeve 15 and the packing pressure plate 16 ensure the long-term maintenance of the dynamic sealing preload, adapting to different media characteristics. Both the gland bolts 20 and the bracket bolts 17 are secured with double nuts or threadlocker to prevent loosening, meeting GB / T standards. The 3098.1 standard requires high-strength bolts to be anti-loosening, adapting to vibration conditions. The sealing components can be pre-assembled and then installed as a whole. The protective shell 21 and the steel plate bracket 18 are quickly aligned with the limiting block 22 through the limiting groove 25, reducing on-site debugging time. When the packing body 14 ages, it is only necessary to loosen the gland bolt 20 and remove the protective shell 21 without damaging the structure of the valve body 4 or valve stem 8, reducing maintenance costs by more than 40%.

[0064] The stabilizing component includes two symmetrically arranged protective shells 21. The top of the protective shell 21 has a clearance hole 1 to avoid the valve stem 8, and the bottom inner wall is provided with a pressure block 23. The bottom of the pressure block 23 abuts against the top of the packing pressure plate 16 to limit the shaking of the packing pressure plate 16.

[0065] The steel plate bracket 18 is fixedly installed on the top of the valve body 4 by bracket bolts 17 and fixing nuts 24. Limiting grooves 25 are opened at the bottom of the ear plates 26 on both sides of the bracket. Limiting blocks 22 are provided on both sides of the protective shell 21. The limiting blocks 22 engage with the limiting grooves 25 to limit the loosening of the protective shell 21.

[0066] The metal spiral wound gasket 3 is fixedly installed on both sides of the valve body 4 by internal hex bolts 19 to achieve static sealing between the valve body 4 and the pipeline flange. The connection between the valve body 4 and the metal spiral wound gasket 3 and the tail cap 2 adopts standard flange or threaded interface, which is compatible with existing industrial pipeline systems and reduces the difficulty of modification.

[0067] The sealing ring 7 is fixedly sleeved on the outer wall of the butterfly plate 9 and cooperates with the valve seat pressure plate 6 on the inner wall of the valve body 4 to achieve dynamic sealing between the butterfly plate 9 and the valve body 4.

[0068] The positioning adjustment sleeve 11 is installed on the inner wall of the valve body 4 by adjusting the screw. It is used to adjust the opening and closing stroke of the valve stem 8. By adjusting the axial position of the positioning adjustment sleeve 11 by adjusting the adjusting screw, the opening and closing stroke of the valve stem 8 can be precisely controlled, and it can be adapted to the output characteristics of different drive mechanisms such as electric, pneumatic and manual.

[0069] The rotating valve stem 8 can drive the butterfly plate 9 to rotate, and the normal delivery of fluid and zero leakage can be achieved through the sealing assembly and sealing ring 7. The stabilizing assembly ensures the installation stability of the packing pressure plate 16 through the three-level protection system of the protective shell 21, pressure block 23 and steel plate bracket 18, and avoids leakage and loosening.

[0070] This application can be used in the field of valves, or in other fields applicable to this application.

[0071] Example 2

[0072] refer to Figure 1-5 An improvement based on Example 1: A robustly installed butterfly valve, applied in the valve field, with the positioning adjustment sleeve 11 and the valve stem 8 mechanically limiting each other to prevent valve overtravel caused by abnormal control signals and protect the sealing components from impact damage.

[0073] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0074] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A securely installed butterfly valve, characterized in that, include: The valve body (4) has a through mounting hole at the top; The valve stem (8) is rotatably installed in the mounting hole, and its outer wall is fixedly fitted with a butterfly plate (9) by a positioning pin (10). The upper bushing (12) and the lower bushing (5) are respectively sleeved on the outer wall of the valve stem (8) and located at the top and bottom of the valve body (4) to support the rotation of the valve stem (8); The sealing assembly is located above the upper bushing (12) and includes a packing gasket (13), a packing body (14), a packing sleeve (15), and a packing pressure plate (16) that are sequentially fitted onto the outer wall of the valve stem (8) from bottom to top. The packing pressure plate (16) is fixed to the top of the valve body (4) by a cover bolt (20) to achieve dynamic sealing between the valve stem (8) and the valve body (4). The stabilizing component includes two symmetrically arranged protective shells (21). The protective shells (21) have a clearance hole (1) at the top to avoid the valve stem (8), and a pressure block (23) is provided on the bottom inner wall. The bottom of the pressure block (23) abuts against the top of the packing pressure plate (16) to limit the shaking of the packing pressure plate (16). A steel plate bracket (18) is fixedly installed on the top of the valve body (4) by bracket bolts (17) and fixing nuts (24). Limiting grooves (25) are opened at the bottom of the ear plates (26) on both sides. Limiting blocks (22) are provided on both sides of the protective shell (21). The limiting blocks (22) engage with the limiting grooves (25) to restrict the loosening of the protective shell (21). The positioning adjustment sleeve (11) is installed on the inner wall of the valve body (4) by adjusting the screw, and is used to adjust the opening and closing stroke of the valve stem (8).

2. The securely installed butterfly valve according to claim 1, characterized in that, The packing body (14) is made of flexible graphite or PTFE material. Through the rigid constraints of the packing sleeve (15) and the packing plate (16), the dynamic sealing pre-tightening force is maintained for a long time.

3. The securely installed butterfly valve according to claim 1, characterized in that, Also includes: Metal spiral wound gaskets (3) are fixedly installed on both sides of the valve body (4) by internal hex bolts (19) to achieve static sealing between the valve body (4) and the pipe flange; The sealing ring (7) is fixedly sleeved on the outer wall of the butterfly plate (9) and cooperates with the valve seat pressure plate (6) on the inner wall of the valve body (4) to achieve dynamic sealing between the butterfly plate (9) and the valve body (4). The valve seat pressure plate (6) mechanically limits the sealing ring (7) to the outer wall of the butterfly plate (9) to avoid displacement of the sealing ring (7) caused by high pressure difference or high frequency opening and closing.

4. The securely installed butterfly valve according to claim 1, characterized in that, Both the gland bolt (20) and the bracket bolt (17) are secured with double nuts or thread sealant to prevent loosening.

5. The securely installed butterfly valve according to claim 1, characterized in that, The sealing assembly can be pre-assembled and then installed as a whole. The protective shell (21) and the steel plate bracket (18) are quickly aligned with the limiting block (22) through the limiting groove (25), reducing on-site debugging time.

6. The securely installed butterfly valve according to claim 1, characterized in that, When the packing body (14) ages, it is only necessary to loosen the gland bolt (20) and remove the protective shell (21) without damaging the structure of the valve body (4) or the valve stem (8).

7. The securely installed butterfly valve according to claim 3, characterized in that, The valve body (4) is connected to the metal spiral wound gasket (3) and the tail cap (2) using standard flanges or threaded interfaces, which are compatible with existing industrial piping systems.

8. The securely installed butterfly valve according to claim 3, characterized in that, in, Rotating the valve stem (8) can drive the butterfly plate (9) to rotate. The normal delivery of fluid and zero leakage are achieved through the sealing assembly and the sealing ring (7). The stabilizing assembly ensures the installation stability of the packing plate (16) and avoids leakage and loosening through the three-level protection system of the protective shell (21), the pressure block (23) and the steel plate bracket (18).

9. The securely installed butterfly valve according to claim 8, characterized in that, The mechanical limiting cooperation between the positioning adjustment sleeve (11) and the valve stem (8) prevents the valve from overtravel due to abnormal control signals and protects the sealing assembly from impact damage. By adjusting the axial position of the positioning adjustment sleeve (11) by adjusting the adjusting screw, the opening and closing stroke of the valve stem (8) can be precisely controlled.

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