High pressure resistant triple offset sealing butterfly valve
By using a separate valve seat, multi-layer composite sealing surface, and triple eccentric structure, the high-pressure resistant triple eccentric sealing butterfly valve solves the problems of difficult maintenance of the sealing surface, insufficient sealing performance, and poor operational stability of existing butterfly valves. It achieves zero leakage and long service life sealing performance under high pressure, reduces maintenance costs, and extends service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YONGJIA SHUANGGONG VALVE MFG CO LTD
- Filing Date
- 2025-07-24
- Publication Date
- 2026-06-26
AI Technical Summary
Existing butterfly valves suffer from problems such as difficult maintenance of sealing surfaces, insufficient sealing performance, poor operational stability, and easy leakage under high pressure. In particular, they have a short service life and high maintenance costs in high-pressure and particulate media environments.
This high-pressure resistant triple-eccentric sealing butterfly valve features a split seat structure, multi-layer composite sealing surface design, and triple eccentric structure. Combined with an A105 forged steel valve body and worm gear assembly, the butterfly plate and valve seat only contact each other when closed. It is normalized by A105 steel forging, achieving a grain size of ASTM 5 and a tensile strength ≥485MPa. It also features an optimized stuffing box design and an integral forged reinforcing rib structure.
It achieves convenient replacement of sealing surfaces, reduces maintenance costs by 50%, improves sealing performance, reduces leakage rate to 10-6cc/sec, extends service life by 3-5 times, increases burst pressure to 25MPa, improves operational stability, and extends maintenance cycle to 8000 hours.
Smart Images
Figure CN224414380U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of butterfly valve technology, specifically to a high-pressure resistant triple eccentric sealing butterfly valve. Background Technology
[0002] Butterfly valves, as a widely used fluid control device, are extensively used in petrochemical, natural gas, and power industries due to their compact structure, simple operation, and excellent sealing performance. Their working principle involves controlling the flow and interruption of fluid flow by rotating a butterfly plate. The butterfly plate rotates within the valve body, achieving a seal through a tight fit with the valve seat. Depending on the eccentric structure, butterfly valves can be divided into double-eccentric butterfly valves and triple-eccentric butterfly valves. Double-eccentric butterfly valves reduce friction during opening and closing and improve sealing performance through radial offset between the valve shaft and the center of the butterfly plate, and axial offset between the valve shaft and the pipeline centerline. Triple-eccentric butterfly valves further enhance sealing performance and service life by adding an angular offset to the butterfly plate sealing surface.
[0003] Currently, the most common butterfly valves on the market are double-eccentric butterfly valves and triple-eccentric butterfly valves, which are used in different application areas. However, in actual use, existing butterfly valves have some shortcomings that urgently need to be addressed:
[0004] Sealing surface maintenance is difficult:
[0005] The one-piece design means that the entire valve must be replaced after the sealing surface wears down, resulting in high maintenance costs (a single maintenance cost accounts for about 60% of the total cost).
[0006] API 598 testing shows that the average service life of the sealing surface of traditional structure valves is only 2,000-3,000 hours, and even shorter in particulate media.
[0007] Insufficient high-pressure sealing performance:
[0008] Conventional double-eccentric structures have a leakage rate exceeding 10% at pressures above 10 MPa. -4 cc / sec (ISO 15848-1B level).
[0009] ASME B16.34 testing shows that the burst pressure of valves of Class 900 and above is generally below 20 MPa.
[0010] Poor operational stability:
[0011] The valve stem torque increases sharply with increasing pressure (reaching over 150 N·m at 15 MPa).
[0012] Insufficient machining precision in a triple-eccentric structure can cause jamming during the opening and closing process (industry average failure rate 12%). Utility Model Content
[0013] The purpose of this invention is to provide a high-pressure resistant triple eccentric sealing butterfly valve to solve the problems mentioned in the background art.
[0014] To achieve the above objectives, this utility model provides the following technical solution:
[0015] A high-pressure resistant triple eccentric sealing butterfly valve includes a valve body, a butterfly plate, a valve shaft, a valve seat, and a valve seat ring. The valve seat is located on one side of the butterfly plate, separate from the valve body, and is fixed to the valve body by valve seat ring screws. A bracket is fixedly installed on the top of the valve body, and a worm gear assembly is fixedly installed on the top of the bracket. The valve shaft is installed on the worm gear assembly and rotates with the worm gear assembly.
[0016] The butterfly plate has a three-eccentric structure, including a first eccentricity, a second eccentricity and a third eccentricity. The first eccentricity is a radial offset of 80±2mm between the valve shaft centerline and the butterfly plate centerline. The second eccentricity is an axial offset of 12±0.5mm between the valve shaft centerline and the pipeline centerline. The third eccentricity is an inclination angle of 9°±0.3° between the butterfly plate sealing surface and the pipeline centerline.
[0017] Furthermore, the valve body is an integral forged structure made of A105 forged steel after normalizing and tempering treatment. The valve body has ASME B16.25 standard butt welding bevels at both ends, and the wall thickness of the valve body is ≥50mm.
[0018] Furthermore, the butterfly plate adopts an A105 forged steel base, and its sealing surface has a multi-layer composite structure, including a 304 stainless steel base and a Stellite 6 alloy layer overlaid on the surface, with a flexible graphite ring embedded at the edge of the sealing surface.
[0019] Furthermore, the butterfly plate and valve shaft are located inside the valve body, and the butterfly plate and valve seat only come into contact during the opening and closing process when fully closed.
[0020] Furthermore, a stuffing box is provided at the top of the valve body, and the stuffing box contains, from top to bottom, a stuffing plate, a stuffing sleeve and a packing, the packing being made of flexible graphite material.
[0021] Furthermore, the inner wall of the packing pressure plate is provided with a 15°±1° conical surface, which matches the outer cone of the packing sleeve. The bottom of the packing sleeve is provided with a 0.5mm thick anti-extrusion ring, and the inner diameter and the gap between the valve shaft are ≤0.03mm.
[0022] Furthermore, the flange neck of the valve body is provided with annular reinforcing ribs. The height of the reinforcing ribs is 1.2 times the wall thickness of the valve body, and the width is 0.8 times the wall thickness. The reinforcing ribs and the valve body are formed by integral forging.
[0023] The beneficial effects of this utility model are as follows:
[0024] 1. This utility model utilizes a separate valve seat structure (the valve seat is separated from the valve body and fixed by a valve seat ring) to facilitate sealing surface replacement and reduce maintenance costs by 50%. Simultaneously, the triple eccentric structure (80±2mm radial offset, 12±0.5mm axial offset, 9°±0.3° tilt angle) combined with the Stellite 6 alloy sealing layer achieves zero leakage (≤10) at a working pressure of 15MPa. -6 (cc / sec). The self-sealing design ensures a tighter seal as the medium pressure increases, with a burst pressure of up to 25MPa (verified by API 598 testing), demonstrating excellent high-pressure sealing performance.
[0025] 2. The valve body of this utility model is made of A105 forged steel, which undergoes normalizing and tempering treatment, achieving a grain size of ASTM grade 5 and a tensile strength ≥485MPa. The multi-layer composite sealing structure (304 stainless steel + Stellite 6 + flexible graphite) extends the sealing surface lifespan by 3-5 times compared to ordinary butterfly valves. The design that the butterfly plate and valve seat only contact each other when closed reduces friction and wear by 90%, significantly extending service life.
[0026] 3. This utility model reduces the replacement time of the sealing surface by 70% through the detachable valve seat design. The optimized design of the stuffing box (15° conical pressure plate + 0.5mm anti-extrusion ring) extends the packing maintenance cycle to 8000 hours. The integral forged reinforcing rib structure avoids stress concentration, extends the service life of the valve body, and provides excellent maintenance convenience. Attached Figure Description
[0027] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0028] Figure 2 This is a cross-sectional structural diagram of the valve body of this utility model;
[0029] Figure 3 This is a utility model Figure 2 Enlarged view of point A in the middle;
[0030] Figure 4 This is a utility model Figure 2 Enlarged view of point B in the middle.
[0031] Reference numerals in the attached drawings: 1. Valve body; 2. Butterfly plate; 3. Valve shaft; 4. Valve seat; 5. Valve seat ring; 6. Bracket; 7. Worm gear assembly; 8. Stuffing box; 801. Stuffing pressure plate; 802. Stuffing sleeve; 803. Stuffing. Detailed Implementation
[0032] 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.
[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0035] In the above description of this utility model, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0036] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.
[0037] Figures 1-4 This is the preferred embodiment of the present invention, which is described below in conjunction with... Figures 1-4 The present invention will be further described below.
[0038] A high-pressure resistant triple-eccentric sealing butterfly valve includes a valve body 1, a butterfly plate 2, a valve shaft 3, a valve seat 4, and a valve seat ring 5. The valve seat 4 is located on one side of the butterfly plate 2 and is separate from the valve body 1. It is fixed to the valve body 1 by screws through the valve seat ring 5. Specifically, the valve seat 4 is installed on the valve body 1 through the valve seat ring 5 and is not integral with the valve body 1, which facilitates the later disassembly and assembly of the valve seat 4 for maintenance. A bracket 6 is fixedly installed on the top of the valve body 1, and a worm gear assembly 7 is fixedly installed on the top of the bracket 6. The valve shaft 3 is installed on the worm gear assembly 7 and rotates with the worm gear assembly 7. Specifically, the butterfly plate 2 is installed on the side of the valve shaft 3. The worm gear assembly 7 can drive the valve shaft 3 and the butterfly plate 2 to rotate. The worm gear assembly 7 is existing technology and is not the innovation direction of this application, so it will not be described in detail here.
[0039] The butterfly plate 2 has a triple eccentric structure, including a first eccentricity, a second eccentricity, and a third eccentricity. The first eccentricity is a radial offset of 80±2mm between the valve shaft 3 centerline and the butterfly plate 2 centerline; the second eccentricity is an axial offset of 12±0.5mm between the valve shaft 3 centerline and the pipeline centerline; and the third eccentricity is a 9°±0.3° inclination angle between the butterfly plate 2 sealing surface and the pipeline centerline. Specifically, this triple eccentric design ensures that the butterfly plate 2 and valve seat 4 only contact when fully closed during opening and closing, avoiding frictional wear and extending the sealing surface life by 3 to 5 times compared to ordinary butterfly valves. The eccentric structure also ensures a tighter seal (self-sealing characteristic) as the medium pressure increases.
[0040] Valve body 1 is an integral forged structure made of A105 forged steel that has undergone normalizing and tempering treatment. Both ends of valve body 1 are provided with ASME B16.25 standard butt welding bevels, and the wall thickness of valve body 1 is ≥50mm. Specifically, valve body 1, made of A105 forged steel and subjected to normalizing and tempering treatment, has a grain size of ASTM grade 5 and a tensile strength of ≥485MPa.
[0041] The butterfly plate 2 uses an A105 forged steel base, and its sealing surface has a multi-layer composite structure, including a 304 stainless steel base and a Stellite 6 alloy layer welded to the surface. The edge of the sealing surface is inlaid with a flexible graphite ring. Specifically, the multi-layer composite sealing structure (304 stainless steel + Stellite 6 + flexible graphite) makes the sealing surface life 3-5 times that of ordinary butterfly valves.
[0042] The butterfly plate 2 and valve shaft 3 are located inside the valve body 1. The butterfly plate 2 and valve seat 4 only contact each other when fully closed during the opening and closing process. Specifically, the design that the butterfly plate 2 and valve seat 4 only contact each other when closed reduces friction and wear by 90% and significantly extends service life.
[0043] The valve body 1 is equipped with a stuffing box 8 at the top. Inside the stuffing box 8, from top to bottom, there are a stuffing plate 801, a stuffing sleeve 802 and a packing 803. The packing 803 is made of flexible graphite material. Specifically, the self-sealing design makes the sealing surface fit tighter the higher the medium pressure. The burst pressure can reach 25MPa (verified by API 598 test), and the high pressure sealing performance is excellent.
[0044] The inner wall of the packing pressure plate 801 is provided with a 15°±1° conical surface, which matches the outer cone of the packing sleeve 802. The bottom of the packing sleeve 802 is provided with a 0.5mm thick anti-extrusion ring, and the gap between the inner diameter and the valve shaft 3 is ≤0.03mm. Specifically, the optimized design of the stuffing box 8 (15° conical pressure plate + 0.5mm anti-extrusion ring) extends the maintenance cycle of the packing 803 to 8000 hours.
[0045] The flange neck of valve body 1 is provided with annular reinforcing ribs. The height of the reinforcing ribs is 1.2 times the wall thickness of the valve body, and the width is 0.8 times the wall thickness. The reinforcing ribs and valve body 1 are formed by integral forging. Specifically, the reinforcing ribs strengthen the flange neck of valve body 1, thereby improving the high pressure resistance of the butterfly valve.
[0046] The working principle and usage process of this utility model are as follows: In practical applications, the butterfly valve is installed in a fluid pipeline system. The valve body 1 is fixed at the pipeline interface. The butterfly plate 2 is connected to the worm gear assembly 7 and the drive device through the valve shaft 3 to realize rotation operation to control the flow and flow of the fluid. The three eccentric structures of the butterfly plate 2 significantly reduce the friction with the valve seat 4 during the opening and closing process, and only contact when fully closed, thereby extending the service life of the sealing surface, which is 3 to 5 times longer than that of ordinary butterfly valves. The eccentric structure makes the sealing surface fit more tightly when the medium pressure is greater (self-sealing characteristic). The valve body 1 is made of A105 forged steel and is normalized and tempered, with a grain size of ASTM grade 5 and a tensile strength of ≥485MPa. Under the action of the stuffing box 8, the high pressure resistance of the butterfly valve can be greatly improved. At the same time, the optimized design of the stuffing box (15° conical pressure plate + 0.5mm anti-extrusion ring) extends the maintenance cycle of packing 803 to 8000 hours. Furthermore, the integral forged reinforcing rib structure avoids stress concentration and extends the service life of the valve body 1.
[0047] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A high-pressure resistant triple eccentric sealing butterfly valve, comprising a valve body (1), a butterfly plate (2), a valve shaft (3), a valve seat (4), and a valve seat ring (5), characterized in that: The valve seat (4) is located on one side of the butterfly plate (2) and is separated from the valve body (1). It is fixed to the valve body (1) by the valve seat ring (5) screw. A bracket (6) is fixedly installed on the top of the valve body (1). A worm gear assembly (7) is fixedly installed on the top of the bracket (6). The valve shaft (3) is installed on the worm gear assembly (7) and rotates with the worm gear assembly (7). The butterfly plate (2) has a three-eccentric structure, including a first eccentricity, a second eccentricity and a third eccentricity. The first eccentricity is that the center line of the valve shaft (3) is radially offset from the center line of the butterfly plate (2) by 80±2mm. The second eccentricity is that the center line of the valve shaft (3) is axially offset from the center line of the pipeline by 12±0.5mm. The third eccentricity is that the sealing surface of the butterfly plate (2) is inclined at an angle of 9°±0.3° to the center line of the pipeline.
2. The high-pressure resistant triple eccentric sealing butterfly valve according to claim 1, characterized in that: The valve body (1) is an integral forged structure made of A105 forged steel after normalizing and tempering. The valve body (1) has ASME B16.25 standard butt welding bevels at both ends. The wall thickness of the valve body (1) is ≥50mm.
3. The high-pressure resistant triple eccentric sealing butterfly valve according to claim 1, characterized in that: The butterfly plate (2) is made of A105 forged steel base, and its sealing surface is a multi-layer composite structure, including a 304 stainless steel base and a Stellite 6 alloy layer overlaid on the surface, with a flexible graphite ring embedded at the edge of the sealing surface.
4. The high-pressure resistant triple eccentric sealing butterfly valve according to claim 1, characterized in that: The butterfly plate (2) and valve shaft (3) are located inside the valve body (1), and the butterfly plate (2) and valve seat (4) only contact each other when fully closed during the opening and closing process.
5. The high-pressure resistant triple eccentric sealing butterfly valve according to claim 1, characterized in that: The valve body (1) is provided with a stuffing box (8) at the top. The stuffing box (8) is provided with a stuffing plate (801), a stuffing sleeve (802) and a packing (803) from top to bottom. The packing (803) is made of flexible graphite material.
6. The high-pressure resistant triple eccentric sealing butterfly valve according to claim 5, characterized in that: The inner wall of the packing pressure plate (801) is provided with a 15°±1° conical surface, which matches the outer cone of the packing sleeve (802). The bottom of the packing sleeve (802) is provided with a 0.5mm thick anti-extrusion ring, and the gap between the inner diameter and the valve shaft (3) is ≤0.03mm.
7. The high-pressure resistant triple eccentric sealing butterfly valve according to claim 1, characterized in that: The flange neck of the valve body (1) is provided with an annular reinforcing rib. The height of the reinforcing rib is 1.2 times the wall thickness of the valve body, and the width is 0.8 times the wall thickness. The reinforcing rib and the valve body (1) are formed by integral forging process.