Three-eccentric butterfly valve with axial force balance

Abstract

The utility model relates to valve technical field provides a three eccentric butterfly valve with axial force balance, including valve body, valve stem, valve seat, dish plate and bottom cover, the valve stem is along the radial setting in the valve body in the valve body, the bottom cover sets up in the bottom of valve body, the side of valve body is along the circumference of valve body and is seted up with first installation groove, the valve seat sets up in first installation groove, is seted up with second installation groove on the valve body, the dish plate includes first partial and second partial, first partial and second partial part are arranged in first installation groove and second installation groove, first partial and second partial part are connected through the connecting piece between first partial and second partial, the pressing plate is provided in first installation groove, one side of pressing plate and first partial abut, the other side and valve seat abut, the side of pressing plate close to valve seat is provided with first slope, is provided with second slope on valve seat, first slope and second slope mutually adapt abut, the utility model discloses can cope with large diameter high pressure application environment, avoid frequent replacement maintenance, improve production efficiency, reduce production maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and more specifically, to a triple eccentric butterfly valve with axial force balance. Background Technology

[0002] The content in this section only provides background information related to this utility model and may not constitute prior art.

[0003] An eccentric butterfly valve is a high-performance butterfly valve that achieves optimized sealing and operation through an eccentric structure, namely, eccentric valve stem, eccentric valve seat, or eccentric conical sealing surface. This structure allows the valve to form a metal-to-metal sealing contact when closed, thereby achieving near-zero leakage under high temperature and high pressure conditions. At the same time, it can effectively reduce friction and wear during opening, extending the valve's lifespan.

[0004] In a typical eccentric butterfly valve, the valve plate center is offset from the pipe center and the valve stem center. However, its sealing pair is usually in a positive cone or near-positive cone contact. When the valve is closed, the valve plate is pushed downstream of the valve seat under the action of fluid pressure, generating a significant axial force pointing downstream. This force is entirely borne by the thrust bearing of the valve stem and the valve body bearing seat. Since the bearing seat cannot effectively cope with the huge axial thrust, ordinary eccentric butterfly valves are usually only suitable for medium and low pressure applications, such as PN16 and PN25, and are difficult to cope with high pressure applications. At the same time, for large-diameter valves, the axial force increases exponentially with the square of the area, and ordinary designs cannot withstand it for a long time. After a short period of operation, the entire valve must be replaced, which seriously affects normal production efficiency and increases maintenance costs. Utility Model Content

[0005] To address the aforementioned technical problems, the purpose of this utility model is to provide a triple eccentric butterfly valve with axial force balance, which can cope with large-diameter high-pressure application environments, avoid frequent replacement and maintenance, improve production efficiency, and reduce production and maintenance costs.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] A triple eccentric butterfly valve with axial force balance includes a valve body, a valve stem, a valve seat, a disc, and a bottom cover. The valve stem is radially disposed within the valve body, and the bottom cover is disposed at the bottom of the valve body. A first mounting groove is formed on one side of the valve body along its circumference, and the valve seat is disposed within the first mounting groove. A second mounting groove is formed on the side of the valve body away from the first mounting groove. The disc includes a first portion and a second portion, which are disposed within the first and second mounting grooves and connected by a connector. A pressure plate is disposed within the first mounting groove, with one side of the pressure plate abutting against the first portion and the other side abutting against the valve seat. A first inclined surface is provided on the side of the pressure plate near the valve seat, and a second inclined surface is provided on the valve seat. The first and second inclined surfaces are mutually adapted and abut against each other.

[0008] In some possible embodiments, an abutment ring is fixedly provided on the peripheral wall of the first portion along the circumferential direction of the first portion. The outer side wall of the abutment ring is used to abut against the valve seat. A first sealing groove is formed between the abutment ring, the pressure plate and the valve seat. A first sealing assembly is provided in the first sealing groove. The first sealing assembly is used to seal the gap between the first portion, the pressure plate and the valve seat.

[0009] In some possible embodiments, the first sealing assembly includes a multi-level seal and a disc seal, the abutment ring having a receiving groove on the side away from the second portion, the disc seal being embedded in the receiving groove, the multi-level seal being disposed in a first sealing groove, and the side of the multi-level seal away from the first portion abutting against the valve seat.

[0010] In some possible embodiments, the pressure plate has a third inclined surface on the side away from the first portion.

[0011] In some possible embodiments, the multi-layer seal is made of 316+ flexible graphite.

[0012] In some possible embodiments, the valve stem passes through the valve body radially, the first portion and the second portion are located on both sides of the valve stem, the connector is a connecting bolt, the second portion has a first connecting hole, the first connecting holes are evenly distributed around the second portion, each first connecting hole is provided with a connector, and the first portion has a second connecting hole for threaded connection of the connector.

[0013] In some possible embodiments, a second sealing groove is provided on the side wall of the valve body, the second sealing groove is connected to the first mounting groove, a sealing ring is fixedly provided on the valve seat, the sealing ring is disposed in the second sealing groove, the diameter of the sealing ring is larger than that of the valve seat, and a second sealing assembly is provided in the second sealing groove, the second sealing assembly is used to seal the gap between the sealing ring and the valve body.

[0014] In some possible embodiments, the second sealing assembly includes a sealing block and a valve seat sealing ring. The sealing block is fixedly disposed on the sealing ring and disposed in the second sealing groove. The valve seat sealing ring is disposed in the second sealing groove, with one side of the valve seat sealing ring abutting against the sealing block and the other side abutting against the inner wall of the second sealing groove.

[0015] In summary, the technical solution of this utility model embodiment has at least the following advantages and beneficial effects:

[0016] 1. By setting a pressure plate and valve seat with mutually compatible first and second inclined surfaces, when the valve is closed and subjected to medium pressure, the axial force acting on the disc plate can be decomposed into a positive pressure perpendicular to the inclined surface, thereby generating a reverse force to offset part of the axial thrust, which greatly reduces the net axial load that the valve stem and bearing need to bear, enabling the valve to be stably applied to harsh working conditions with higher pressure levels and large diameters, breaking through the application pressure limitations of traditional eccentric butterfly valves;

[0017] 2. The disc plate is designed as a first part and a second part fixed by a connector, and a first sealing groove is formed between the abutment ring, the pressure plate and the valve seat. It has built-in multi-level seals and disc plate seals. This split structure is easy to process and assemble. The multi-seal system composed of metal seals and soft packing can provide redundant sealing protection under high pressure, achieve zero leakage of metal to metal main seal, and compensate for micro-unevenness with flexible seals, which significantly improves the reliability and service life of the sealing pair.

[0018] 3. The sealing ring on the valve seat cooperates with the second sealing groove on the valve body, and a second sealing assembly consisting of a sealing block and a valve seat sealing ring is set therein. This creates a robust sealing barrier at the static connection between the valve seat and the valve body, effectively preventing leakage of the medium from the outside of the valve seat and between the valve body mounting groove. This enhances the integrity of the overall pressure-bearing boundary of the valve, and is especially suitable for corrosive and hazardous media conditions.

[0019] 4. The split disc design and the use of connecting bolts make core components such as disc seals and valve seats easy to inspect and replace. When the sealing surface is worn, there is no need to replace the entire valve or perform large-scale cutting and welding. Local repairs or component replacements can be performed. The modular design greatly simplifies the maintenance process, shortens downtime, and thus effectively reduces long-term operation and maintenance costs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0021] Figure 2 for Figure 1 AA section view in the middle;

[0022] Figure 3 for Figure 2 Enlarged view of part A in the image.

[0023] Icons: 1. Valve body; 11. Second sealing groove; 12. Second sealing assembly; 121. Sealing block; 122. Valve seat sealing ring; 2. Valve stem; 3. Valve seat; 31. Second inclined surface; 32. Sealing ring; 4. Disc; 41. First section; 42. Second section; 43. Connector; 44. Abutment ring; 45. First sealing groove; 46. Receiving groove; 47. First connecting hole; 48. Second connecting hole; 5. Bottom cover; 6. First mounting groove; 7. Second mounting groove; 8. Pressure plate; 81. First inclined surface; 82. Third inclined surface; 9. First sealing assembly; 91. Multi-level seal; 92. Disc seal. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] The following is for reference Figures 1 to 3 The present invention will be described in further detail below.

[0026] Reference Figure 1 , Figure 2 and Figure 3 A triple eccentric butterfly valve with axial force balance is characterized by comprising a valve body 1, a valve stem 2, a valve seat 3, a disc 4, and a bottom cover 5.

[0027] Among them, the valve body 1, as the main pressure-bearing component and structural foundation of the valve, is preferably made of WCB carbon steel, CF8 stainless steel or higher grade duplex stainless steel by casting or forging to ensure that it has sufficient mechanical strength, good pressure resistance and excellent resistance to media corrosion, and can adapt to the complex working conditions in the fields of petrochemical, power system and other fields.

[0028] Reference Figure 1 and Figure 2 The valve stem 2 is arranged radially inside the valve body 1. The valve stem 2 is a key moving part that transmits torque and realizes the opening and closing of the disc 4. Its material should be selected from materials with high strength, high hardness and excellent corrosion resistance, such as 17-4PH precipitation hardening stainless steel, to ensure its reliability under long-term torsional load and media corrosion.

[0029] Reference Figure 1 and Figure 2 The bottom cover 5 is located at the bottom of the valve body 1 and is fixedly connected to the valve body 1 by bolts, which facilitates the installation and maintenance of internal components.

[0030] Reference Figure 1 and Figure 2 A first mounting groove 6 is provided on one side of the valve body 1 along the circumference of the valve body 1, and the valve seat 3 is disposed in the first mounting groove 6. A second mounting groove 7 is provided on the side of the valve body 1 away from the first mounting groove 6.

[0031] As one embodiment of this utility model, refer to Figure 2 The disc 4 includes a first part 41 and a second part 42. The first part 41 and the second part 42 are respectively disposed in the first mounting groove 6 and the second mounting groove 7. The first part 41 and the second part 42 are connected by a connector 43. A pressure plate 8 is disposed in the first mounting groove 6. One side of the pressure plate 8 abuts against the first part 41 and the other side abuts against the valve seat 3. A first inclined surface 81 is disposed on the side of the pressure plate 8 near the valve seat 3. A second inclined surface 31 is disposed on the valve seat 3. The first inclined surface 81 and the second inclined surface 31 are adapted to abut against each other.

[0032] The design of this inclined structure allows the axial force of the medium acting on the disc 4 to be decomposed into a positive pressure perpendicular to the inclined plane when the valve is closed, thereby generating a reverse force, effectively balancing the axial thrust, reducing the load on the valve stem 2 and bearings, and is suitable for high pressure conditions of PN40 and above.

[0033] Reference Figure 1 , Figure 2 and Figure 3 An abutment ring 44 is fixedly provided on the peripheral wall of the first section 41 along the circumferential direction of the first section 41. The outer side wall of the abutment ring 44 is used to abut against the valve seat 3. A first sealing groove 45 is formed between the abutment ring 44, the pressure plate 8 and the valve seat 3. A first sealing component 9 is provided in the first sealing groove 45. The first sealing component 9 is used to seal the gap between the first section 41, the pressure plate 8 and the valve seat 3.

[0034] Reference Figure 1 , Figure 2 and Figure 3 As one embodiment of the present invention, the first sealing assembly 9 includes a multi-level sealing member 91 and a disc plate 4 sealing member. A receiving groove 46 is provided on the side of the abutment ring 44 away from the second part 42. The disc plate 4 sealing member is embedded in the receiving groove 46. The multi-level sealing member 91 is disposed in the first sealing groove 45. The side of the multi-level sealing member 91 away from the first part 41 abuts against the valve seat 3.

[0035] Reference Figure 2 and Figure 3A third inclined surface 82 is provided on the side of the pressure plate 8 away from the first section 41. The third inclined surface 82 is used to further optimize the force distribution and enhance the stability of the sealing pair.

[0036] As one embodiment of this utility model, the material of the multi-level seal 91 is set as 316 + flexible graphite.

[0037] Reference Figure 2 and Figure 3 The valve stem 2 passes through the valve body 1 radially. The first part 41 and the second part 42 are respectively located on both sides of the valve stem 2. The connecting piece 43 is a connecting bolt. The second part 42 is provided with a first connecting hole 47. Multiple first connecting holes 47 are evenly provided along the circumference of the second part 42. Each first connecting hole 47 is provided with a connecting piece 43. The first part 41 is provided with a second connecting hole 48 for threaded connection of the connecting piece 43.

[0038] Reference Figure 3 A second sealing groove 11 is provided on the side wall of the valve body 1. The second sealing groove 11 is connected to the first mounting groove 6. A sealing ring 32 is fixedly provided on the valve seat 3. The sealing ring 32 is located in the second sealing groove 11. The diameter of the sealing ring 32 is larger than that of the valve seat 3. A second sealing component 12 is provided in the second sealing groove 11. The second sealing component 12 is used to close the gap between the sealing ring 32 and the valve body 1.

[0039] As one embodiment of this utility model, refer to Figure 3 The second sealing assembly 12 includes a sealing block 121 and a valve seat 3 sealing ring 122. The sealing block 121 is fixedly disposed on the sealing ring 32 and disposed in the second sealing groove 11. The valve seat 3 sealing ring 122 is disposed in the second sealing groove 11. One side of the valve seat 3 sealing ring 122 abuts against the sealing block 121, and the other side abuts against the inner wall of the second sealing groove 11.

[0040] The implementation principle of the triple eccentric butterfly valve with axial force balance proposed in this embodiment of the invention is as follows:

[0041] By setting a pressure plate 8 and a valve seat 3 with mutually compatible first inclined surface 81 and second inclined surface 31, when the valve is closed and subjected to medium pressure, the axial force acting on the disc 4 can be decomposed into a positive pressure perpendicular to the inclined surface, thereby generating a reverse force to offset part of the axial thrust, which greatly reduces the net axial load that the valve stem 2 and bearing need to bear, enabling the valve to be stably applied to harsh working conditions with higher pressure levels and large diameters, breaking through the application pressure limitations of traditional eccentric butterfly valves.

[0042] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A triple eccentric butterfly valve with axial force balance, characterized in that: The valve body includes a valve body (1), a valve stem (2), a valve seat (3), a disc (4), and a bottom cover (5). The valve stem (2) is arranged radially within the valve body (1). The bottom cover (5) is located at the bottom of the valve body (1). A first mounting groove (6) is provided on one side of the valve body (1) along its circumference. The valve seat (3) is located within the first mounting groove (6). A second mounting groove (7) is provided on the side of the valve body (1) away from the first mounting groove (6). The disc (4) includes a first portion (41) and a second portion (42). 1) The first part (41) and the second part (42) are respectively located in the first mounting groove (6) and the second mounting groove (7). The first part (41) and the second part (42) are connected by a connector (43). A pressure plate (8) is provided in the first mounting groove (6). One side of the pressure plate (8) abuts against the first part (41) and the other side abuts against the valve seat (3). A first inclined surface (81) is provided on the side of the pressure plate (8) near the valve seat (3). A second inclined surface (31) is provided on the valve seat (3). The first inclined surface (81) and the second inclined surface (31) are adapted to abut against each other.

2. A triple eccentric butterfly valve with axial force balance according to claim 1, characterized in that: An abutment ring (44) is fixedly provided on the peripheral wall of the first part (41) along the circumferential direction of the first part (41). The outer side wall of the abutment ring (44) is used to abut against the valve seat (3). A first sealing groove (45) is formed between the abutment ring (44), the pressure plate (8) and the valve seat (3). A first sealing component (9) is provided in the first sealing groove (45). The first sealing component (9) is used to seal the gap between the first part (41), the pressure plate (8) and the valve seat (3).

3. A triple eccentric butterfly valve with axial force balance according to claim 2, characterized in that: The first sealing assembly (9) includes a multi-level seal (91) and a disc (4) seal. The abutment ring (44) has a receiving groove (46) on the side away from the second part (42). The disc (4) seal is embedded in the receiving groove (46). The multi-level seal (91) is disposed in the first sealing groove (45). The side of the multi-level seal (91) away from the first part (41) abuts against the valve seat (3).

4. A triple eccentric butterfly valve with axial force balance according to claim 2, characterized in that: The pressure plate (8) has a third inclined surface (82) on the side away from the first section (41).

5. A triple eccentric butterfly valve with axial force balance according to claim 3, characterized in that: The material of the multi-level seal (91) is set to 316+ flexible graphite.

6. A triple eccentric butterfly valve with axial force balance according to claim 1, characterized in that: The valve stem (2) passes through the valve body (1) radially. The first part (41) and the second part (42) are respectively located on both sides of the valve stem (2). The connector (43) is configured as a connecting bolt. The second part (42) is provided with a first connecting hole (47). Multiple first connecting holes (47) are evenly provided along the circumference of the second part (42). Each first connecting hole (47) is provided with a connector (43). The first part (41) is provided with a second connecting hole (48) for the connector (43) to be threaded.

7. A triple eccentric butterfly valve with axial force balance according to claim 1, characterized in that: The valve body (1) has a second sealing groove (11) on its side wall. The second sealing groove (11) is connected to the first mounting groove (6). A sealing ring (32) is fixedly provided on the valve seat (3). The sealing ring (32) is located in the second sealing groove (11). The diameter of the sealing ring (32) is larger than that of the valve seat (3). A second sealing assembly (12) is provided in the second sealing groove (11). The second sealing assembly (12) is used to close the gap between the sealing ring (32) and the valve body (1).

8. A triple eccentric butterfly valve with axial force balance according to claim 7, characterized in that: The second sealing assembly (12) includes a sealing block (121) and a valve seat (3) sealing ring (122). The sealing block (121) is fixedly disposed on the sealing ring (32). The sealing block (121) is disposed in the second sealing groove (11). The valve seat (3) sealing ring (122) is disposed in the second sealing groove (11). One side of the valve seat (3) sealing ring (122) abuts against the sealing block (121), and the other side abuts against the inner wall of the second sealing groove (11).

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