Butterfly valve

Abstract

The invention relates to the technical field of valves, in particular to a butterfly valve. Comprising a valve body provided with a channel internally provided with a butterfly plate; the valve rod penetrates through the valve body and is connected with the butterfly plate; the valve seat is located between the butterfly plate and the side wall of the channel, and a gap is formed between the valve seat and the side wall of the channel; the piston ring is located on the valve seat, and when the butterfly valve is in a closed state, the butterfly plate abuts against the piston ring; and the pressing ring is suitable for pressing and fixing the valve seat and the piston ring on the valve body. In the assembly process, the valve seat can be adjusted in a self-adaptive mode through the gap between the valve seat and the side wall of the channel, the valve seat is completely matched with the butterfly plate, and the contact face of the piston ring and the butterfly plate is evenly stressed by one circle. And then the pressing ring is connected to the valve body, and the valve seat and the piston ring are fixed.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and particularly to a butterfly valve. Background Art

[0002] A butterfly valve, also called a flap valve, is a simple-structured regulating valve. A butterfly valve used for on-off control of a medium in a low-pressure pipeline refers to a valve in which a closing member (valve flap or butterfly plate) is a disc and rotates around a valve shaft to achieve opening and closing.

[0003] In the existing butterfly valve, the piston ring is in close contact with the side wall of the valve body passage. When the butterfly plate has an installation deviation, the acting force between the butterfly plate and the piston ring is uneven, resulting in a reduction in the blocking effect of the butterfly valve. Summary of the Invention

[0004] In view of this, the present invention provides a butterfly valve to solve the problem that the blocking effect of the butterfly valve is reduced due to the installation deviation of the butterfly plate.

[0005] The present invention provides a butterfly valve, including:

[0006] A valve body having a passage with a butterfly plate disposed therein;

[0007] A valve stem passing through the valve body and connected to the butterfly plate;

[0008] A valve seat located between the butterfly plate and the side wall of the passage and having a gap with the side wall of the passage;

[0009] A piston ring located on the valve seat, and the butterfly plate abuts against the piston ring when the butterfly valve is in a closed state;

[0010] A pressing ring adapted to press and fix the valve seat and the piston ring on the valve body.

[0011] In this application, during assembly, the valve seat can be adaptively adjusted through the gap with the side wall of the passage to be completely fitted with the butterfly plate, so that the contact surface between the piston ring and the butterfly plate is uniformly stressed around. Then, the pressing ring is connected to the valve body to fix the valve seat and the piston ring.

[0012] In an optional embodiment, the piston ring is pressed between the valve seat and the pressing ring. When the pressing ring is connected to the valve body, it can press and fix the valve seat and the piston ring.

[0013] In an alternative embodiment, the piston ring includes a C-shaped portion and an arm connected to the C-shaped portion. The arm extends out of the valve seat, and when the butterfly valve is in the closed state, the arm abuts against the butterfly plate. The arm extends out of the valve seat, and when the butterfly valve is in the closed state, the extending portion of the arm can abut against the butterfly plate. When a fluid medium passes through the channel, the opening of the C-shaped portion faces the direction of the fluid medium. The fluid medium exerts a force on the extending portion of the arm, causing the C-shaped portion to deform in the direction towards the butterfly plate, enhancing the abutting force between the extending portion of the arm and the bottom plate, and increasing the blocking effect of the butterfly plate.

[0014] In an alternative embodiment, the valve seat includes a first valve seat and a second valve seat. The first valve seat and the pressing ring are respectively located on both sides of the second valve seat.

[0015] In an alternative embodiment, the piston ring includes a first piston ring and a second piston ring. The first piston ring is pressed between the first valve seat and the second valve seat, and the second piston ring is pressed between the second valve seat and the pressing ring. When the pressing ring is fixed on the valve body, it can successively press and fix the first valve seat, the second valve seat, the first piston ring, and the second piston ring on the valve body, and at the same time make the whole composed of the valve seat and the piston ring produce a seal between the valve body. When a seal is formed due to the abutment between the butterfly plate and the piston ring, the channel is blocked.

[0016] In an alternative embodiment, the C-shaped portion of the first piston ring faces a first direction, and the C-shaped portion of the second piston ring faces a second direction. The second direction is the direction from the first piston ring to the second piston ring, and the first direction and the second direction are opposite. When the direction of the fluid medium is the second direction, the fluid medium can exert a force on the extending portion of the arm of the first piston ring, causing the C-shaped portion of the first piston ring to deform, so that an abutting force occurs between the extending portion of the arm of the first piston ring and the butterfly plate, enabling the butterfly plate to block the channel.

[0017] In an alternative embodiment, a limit sleeve is sleeved on the valve stem, and the limit sleeve is located between the butterfly plate and the side wall of the channel. The butterfly plate is connected to the valve stem and can rotate with the rotation of the valve stem. The limit sleeve is located between the butterfly plate and the side wall of the channel and can limit the butterfly plate on the axis of the valve stem.

[0018] In an alternative embodiment, a gasket is provided on the side wall of the first valve seat close to the valve stem.

[0019] In an alternative embodiment, a bearing is provided between the valve stem and the valve body, enabling the valve stem and the valve body to be rotatably connected.

[0020] In an alternative embodiment, an actuator is further included, which is adapted to drive the valve stem. Description of the Drawings

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 Structural schematic diagram of an embodiment of the present invention;

[0023] Figure 2 Partial enlarged schematic diagram of part A in an embodiment of the present invention;

[0024] Figure 3 Structural schematic diagram of the piston ring in an embodiment of the present invention.

[0025] Explanation of reference numerals:

[0026] 1. Valve body; 2. Butterfly plate; 3. Channel; 4. Valve stem; 5. Pressure ring; 6. C-shaped part; 7. First support arm; 8. Second support arm; 9. First valve seat; 10. Second valve seat; 11. First piston ring; 12. Second piston ring; 13. Limit sleeve; 14. Gasket; 15. Bearing. Specific embodiments

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0028] The existing double-eccentric butterfly valve piston rings mostly adopt the structure of split rings, studs, and pressure rings to hold against the valve seat. The structure is relatively complex and requires double nuts for loosening prevention. To simplify the valve structure, in this application, bolts are used to fix the pressure ring to press the piston ring, and the end flange gasket is relied on to press the tail of the bolt for loosening prevention.

[0029] The following will describe the embodiments of the present invention in conjunction with Figures 1 to 3 , the embodiments of the present invention will be described.

[0030] According to an embodiment of the present invention, as Figure 1 shown, a butterfly valve is provided, including:

[0031] A valve body 1 having a channel 3 with a butterfly plate 2 disposed therein;

[0032] The valve stem 4 penetrates through the valve body 1 and is connected to the butterfly plate 2; the valve stem 4 can penetrate through the two side walls of the channel 3 and is rotatably connected to the valve body 1. A sealing member can be provided at one end of the valve stem 4 so that the sealing member seals the end of the valve stem 4 and the valve body 1, and an actuator can be provided at the other end of the valve stem 4.

[0033] The valve seat is located between the butterfly plate 2 and the side wall of the channel 3 and has a gap with the side wall of the channel 3;

[0034] The piston ring is located on the valve seat, and when the butterfly valve is in the closed state, the butterfly plate 2 abuts against the piston ring;

[0035] The pressing ring 5 is adapted to press and fix the valve seat and the piston ring on the valve body 1.

[0036] The butterfly plate 2 can be disc-shaped or eccentric disc-shaped, and the valve seat can be annular.

[0037] A stepped surface can be provided on the inner side wall of the channel 3. The valve seat has a gap with the stepped surface in the axial direction of the valve stem 4. The pressing ring 5 is detachably connected to the stepped surface away from the valve stem 4. The pressing ring 5 can be pressed on the stepped surface and is connected to the stepped surface of the valve body 1 through screws. When the screws are detached from the valve body 1, the valve seat can be adjusted. The valve seat is located at the stepped surface between the valve stem 4 and the pressing ring 5.

[0038] In the present application, during assembly, the valve seat can be adaptively adjusted through the gap with the side wall of the channel 3 to perfectly fit with the butterfly plate 2, so that the contact surface of the piston ring with the butterfly plate 2 is uniformly stressed around the circumference. Then, the pressing ring 5 is connected to the valve body 1 to fix the valve seat and the piston ring.

[0039] In an alternative embodiment, the piston ring is pressed between the valve seat and the pressing ring 5. When the pressing ring 5 is connected to the valve body 1, it can press and fix the valve seat and the piston ring. By clamping the piston ring between the valve seat and the pressing ring 5 and using the fixed connection between the pressing ring 5 and the valve body 1, the stability of the overall structure is achieved. The complex fastening structure in the traditional butterfly valve (such as split rings, studs and double-nut lock designs) is simplified. The direct pressing method of the pressing ring 5 not only reduces the number of parts but also reduces the assembly steps, thus significantly reducing the manufacturing cost and assembly time. In addition, through the uniform pressure distribution of the pressing ring 5, the contact surface between the piston ring and the valve seat can achieve full-circumference sealing, avoiding seal failure caused by local stress concentration. This design is especially suitable for high-temperature or high-pressure working conditions, because the rigid fixation of the pressing ring 5 can resist deformation caused by thermal expansion or medium pressure, ensuring long-term seal reliability. At the same time, the self-adaptive gap adjustment function allows the valve seat to automatically center during assembly, further improving the sealing surface fit and reducing the dependence on manual adjustment.

[0040] In an alternative embodiment, the piston ring includes a C-shaped portion 6 and arms connected to the C-shaped portion 6. The arms extend out of the valve seat, and when the butterfly valve is in the closed state, the arms abut against the butterfly plate 2. The arms extend out of the valve seat, and when the butterfly valve is in the closed state, the extended portions of the arms can abut against the butterfly plate 2. When a fluid medium passes through the channel 3, the opening of the C-shaped portion 6 faces the direction of the incoming fluid medium. The fluid medium exerts a force on the extended portions of the arms, causing the C-shaped portion 6 to deform in the direction towards the butterfly plate 2, enhancing the abutting force between the extended portions of the arms and the bottom plate, and increasing the blocking effect of the butterfly plate 2.

[0041] Specifically, as Figure 3 shown, the arms include a first arm 7 and a second arm 8. The first arm 7 extends between the valve seat and the compression ring 5, and the second arm 8 extends out of the valve seat.

[0042] When the butterfly valve is closed, the extended portions of the arms directly abut against the butterfly plate 2, and the opening direction of the C-shaped portion 6 is consistent with the direction of the incoming fluid. Under the action of the medium pressure, the C-shaped portion 6 undergoes elastic deformation in the direction towards the butterfly plate 2, thereby increasing the contact force between the arms and the butterfly plate 2 and forming a dynamically enhanced sealing effect. This design solves the problem of insufficient sealing force of traditional butterfly valves under low-pressure or small pressure difference conditions. In addition, the elastic deformation of the C-shaped portion 6 can compensate for the increase in the sealing surface gap caused by temperature changes or mechanical wear, extending the service life of the valve. The extended structure of the arms can also disperse the fluid impact force and reduce local wear, especially suitable for working conditions with particulate or high-flow-rate media. Overall, this design realizes passive pressure-driven sealing without additional mechanical devices, significantly improving the sealing reliability and working condition adaptability.

[0043] In an alternative embodiment, as Figure 2 shown, the valve seat includes a first valve seat 9 and a second valve seat 10. The first valve seat 9 and the compression ring 5 are respectively located on both sides of the second valve seat 10.

[0044] In an alternative embodiment, as Figure 2 shown, the piston ring includes a first piston ring 11 and a second piston ring 12. The first piston ring 11 is pressed between the first valve seat 9 and the second valve seat 10, and the second piston ring 12 is pressed between the second valve seat 10 and the compression ring 5. When the compression ring 5 is fixed on the valve body 1, it can successively press and fix the first valve seat 9, the second valve seat 10, the first piston ring 11, and the second piston ring 12 on the valve body 1, and at the same time cause the overall formed by the valve seat and the piston ring to seal against the valve body 1. When sealing is achieved due to the abutment between the butterfly plate 2 and the piston ring, the channel 3 is blocked. The contact surface between the second arms 8 of the first piston ring 11 and the second piston ring 12 and the butterfly plate 2 can be an inclined surface, that is, the first piston ring 11, the second piston ring 12, and the butterfly plate 2 are matching conical bodies.

[0045] Specifically, the first valve seat 9 and the second valve seat 10 are in contact with each other and can form a first cavity for accommodating the first piston ring 11, and the first piston ring 11 is pressed in the first cavity. The second valve seat 10 and the pressure ring 5 are in contact with each other and can form a second cavity for accommodating the second piston ring 12, and the second piston ring 12 is pressed in the second cavity. The first arm 7 of the first piston ring 11 is located between the first valve seat 9 and the second valve seat 10, and the first arm 7 of the second piston ring 12 is located between the second valve seat 10 and the pressure ring 5.

[0046] In an alternative embodiment, the C-shaped portion 6 of the first piston ring 11 faces the first direction, the C-shaped portion 6 of the second piston ring 12 faces the second direction, the second direction is the direction from the first piston ring 11 to the second piston ring 12, and the first direction and the second direction are opposite. When the fluid medium comes from the second direction, the fluid medium can exert a force on the arm extension of the first piston ring 11, and the C-shaped portion 6 of the first piston ring 11 deforms, so that a contact force occurs between the arm extension of the first piston ring 11 and the butterfly plate 2, so that the butterfly plate 2 blocks the channel 3.

[0047] Specifically, as Figure 2 shown, the first valve seat 9 is arranged on the left side of the second valve seat 10, the pressure ring 5 is arranged on the right side of the second valve seat 10, the first cavity is located at the inner ring position of the first valve seat 9 and the second valve seat 10, and the second cavity is located at the inner ring position of the second valve body 1 and the pressure ring 5.

[0048] The first valve seat 9, the second valve seat 10 and the double piston rings arranged in reverse (the C-shaped portion 6 of the first piston ring 11 faces the first direction, and the C-shaped portion 6 of the second piston ring 12 faces the second direction) form a two-way full-pressure sealing structure. When the fluid flows in from the second direction, the C-shaped portion 6 of the first piston ring 11 deforms under the medium pressure, enhancing the contact force between the arm and the butterfly plate 2; conversely, when the fluid flows in the reverse direction, the second piston ring 12 also plays the same role. This two-way self-adaptive sealing design enables the butterfly valve to achieve high sealing performance under both forward and reverse medium flows, breaking through the application limitations of traditional single-direction sealing butterfly valves. At the same time, the double-valve-seat layered compression and fixation structure sequentially compresses the first valve seat 9, the second valve seat 10 and the piston rings through the pressure ring 5 to form a multi-layer sealing barrier, further improving the leakage protection level.

[0049] In an alternative embodiment, a limit sleeve 13 is sleeved on the valve stem 4, and the limit sleeve 13 is located between the butterfly plate 2 and the side wall of the channel 3. The butterfly plate 2 is connected to the valve stem 4 and can rotate with the rotation of the valve stem 4. The limit sleeve 13 is located between the butterfly plate 2 and the side wall of the channel 3 and can limit the butterfly plate 2 on the axis of the valve stem 4.

[0050] The limit sleeve 13 is installed on the valve stem 4 and is located between the butterfly plate 2 and the side wall of the channel 3. Its main function is to restrict the axial displacement of the butterfly plate 2. When the valve is frequently opened and closed or subjected to high-pressure impacts, the butterfly plate 2 may undergo axial displacement due to inertia or medium pressure, resulting in misalignment of the sealing surface or wear of the valve stem 4. The limit sleeve 13 restricts the butterfly plate 2 to a fixed position through rigid support, ensuring that its rotation center always coincides with the axis of the valve stem 4, thereby maintaining uniform contact of the sealing surface. In addition, the limit sleeve 13 can also absorb part of the vibration energy, reduce the mechanical fatigue of the valve stem 4 and the bearing 15, and extend the service life of key components. This design is particularly suitable for high-frequency operation or high-vibration environments (such as pumping stations, compressor systems), significantly improving the stability and durability of the valve.

[0051] In an alternative embodiment, a gasket 14 is provided on the side wall of the first valve seat 9 close to the valve stem 4.

[0052] The gasket 14 is located on the side wall of the first valve seat 9 close to the valve stem 4, and its functions include sealing compensation and stress buffering. During valve assembly or operation, there may be small gaps between the valve seat and the valve body 1 due to machining errors or thermal expansion. The elastic deformation of the gasket 14 can fill these gaps to prevent medium leakage. At the same time, the gasket 14 can also absorb the mechanical stress transmitted by the vibration of the valve stem 4 or the fluctuation of the medium pressure, avoiding wear caused by direct contact between the valve seat and the valve body 1. This design is particularly suitable for working conditions with large temperature differences (such as steam systems), maintaining long-term sealing performance through elastic compensation and reducing the frequency of shutdown maintenance.

[0053] In an alternative embodiment, a bearing 15 is provided between the valve stem 4 and the valve body 1, enabling the valve stem 4 and the valve body 1 to be rotatably connected.

[0054] The gasket 14 is annular, and the limit sleeve 13 abuts against the bearing 15 and the inner side wall of the channel 3 respectively, so as to limit the bearing 15 when limiting the butterfly plate 2.

[0055] The introduction of the bearing 15 converts the sliding friction between the valve stem 4 and the valve body 1 into rolling friction, significantly reducing the driving torque required for valve opening and closing. Traditional butterfly valves often cause actuator overload due to excessive frictional resistance in high-temperature or high-viscosity media, while the friction-reducing characteristics of the bearing 15 effectively solve this problem. In addition, the self-lubricating design of the rolling bearing 15 (such as using graphite or PTFE materials) can adapt to high-temperature or corrosive working conditions and reduce the maintenance frequency. The precise guiding function of the bearing 15 also improves the rotation accuracy of the valve stem 4, avoiding wear of the sealing surface caused by eccentric movement of the butterfly plate 2. This technical solution not only improves the operating flexibility of the valve, but also expands its applicable temperature range (from low temperature to high temperature) to meet diverse industrial needs.

[0056] In an alternative embodiment, it further includes an actuator suitable for driving the valve stem 4. A gearbox, an electric actuator, a pneumatic actuator, an electro-hydraulic actuator, etc. can be used as the actuator for driving operation.

[0057] By supporting multiple actuator driving methods such as gearbox, electric, pneumatic, and electro-hydraulic, this butterfly valve can be flexibly adapted to different automation control systems. For example, a pneumatic actuator can be used in an explosion-proof environment, while an electric servo actuator can be used in a high-precision flow control scenario. This multi-drive compatibility reduces the user's retrofit cost and enables the valve to be quickly integrated into the existing system. In addition, the modular design of the actuator allows for later upgrade or replacement of the driving method, improving the life cycle value of the product. Combined with the bidirectional full-pressure sealing characteristics, this butterfly valve becomes an ideal choice for complex working conditions in fields such as petrochemical, power, and water treatment.

[0058] The piston ring of the present application can be self-positioned; the piston ring can be bolted and fixed through a pin shaft; it has a simple structure and low cost.

[0059] The present application is applicable to low-temperature working conditions, normal-temperature working conditions, and high-temperature working conditions.

[0060] Although the 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, Comprising: A valve body (1) having a passage (3) with a butterfly plate (2) disposed therein; A valve stem (4) passing through the valve body (1) and connected to the butterfly plate (2); A valve seat located between the butterfly plate (2) and the side wall of the passage (3), and having a gap with the side wall of the passage (3); A piston ring located on the valve seat, and the butterfly plate (2) abuts against the piston ring when the butterfly valve is in the closed state; A pressing ring (5) adapted to press and fix the valve seat and the piston ring on the valve body (1).

2. The butterfly valve according to claim 1, characterized in that, The piston ring is pressed between the valve seat and the pressing ring (5).

3. The butterfly valve according to claim 1, characterized in that, The piston ring includes a C-shaped portion (6) and a support arm connected to the C-shaped portion (6), the support arm extending out of the valve seat, and the support arm abuts against the butterfly plate (2) when the butterfly valve is in the closed state.

4. The butterfly valve according to claim 3, wherein The valve seat includes a first valve seat (9) and a second valve seat (10), and the first valve seat (9) and the pressing ring (5) are respectively located on both sides of the second valve seat (10).

5. The butterfly valve according to claim 4, characterized in that, The piston ring includes a first piston ring (11) and a second piston ring (12), the first piston ring (11) is pressed between the first valve seat (9) and the second valve seat (10), and the second piston ring (12) is pressed between the second valve seat (10) and the pressing ring (5).

6. The butterfly valve according to claim 5, characterized in that, The C-shaped portion (6) of the first piston ring (11) faces a first direction, the C-shaped portion (6) of the second piston ring (12) faces a second direction, the second direction is the direction from the first piston ring (11) to the second piston ring (12), and the first direction and the second direction are opposite.

7. The butterfly valve according to claim 1, characterized in that, A limit sleeve (13) is sleeved on the valve stem (4), and the limit sleeve (13) is located between the butterfly plate (2) and the side wall of the passage (3).

8. The butterfly valve according to claim 4, characterized in that, A gasket (14) is provided on the side wall of the first valve seat (9) close to the valve stem (4).

9. The butterfly valve according to claim 1, characterized in that, A bearing (15) is provided between the valve stem (4) and the valve body (1).

10. The butterfly valve according to claim 1, characterized in that, An actuator is further included, adapted to drive the valve stem (4).

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