Butterfly valve with high reverse sealing performance
By combining bushing design and deep groove ball bearings, the problem of poor sealing performance of butterfly valves under reverse high pressure was solved, achieving a butterfly valve design with high reverse sealing performance and low torque loss.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WUXI BAONIU VALVE IND CO LTD
- Filing Date
- 2025-05-21
- Publication Date
- 2026-05-12
AI Technical Summary
Existing triple-eccentric metal-sealed butterfly valves have poor sealing performance under reverse high pressure conditions, making it difficult to meet leakage level requirements, and the deformation of the valve stem leads to significant torque loss.
The bushing design reduces the direct contact area between the medium and the valve stem, while the use of deep groove ball bearings increases the stress points. The bushing and valve stem are made of forged stainless steel, and the combination of packing groove and packing achieves a seal, reducing valve stem deformation.
It improves reverse sealing performance, reduces torque loss caused by valve stem deformation, ensures proper sealing surface fit, and reduces leakage.
Smart Images
Figure CN224229274U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of valve technology and relates to a butterfly valve with high reverse sealing performance. Background Technology
[0002] Butterfly valves have seen rapid development in the valve industry in recent years due to their convenient and rapid opening and closing, labor-saving operation, low fluid resistance, and easy installation. Butterfly valves have a wide range of applications, controlling the flow of various types of fluids such as air, water, steam, various corrosive media, slurry, oil, and liquid metals. In pipelines, they primarily function as shut-off and throttling devices. With the application of high-temperature resistant, low-temperature resistant, strong corrosion resistant, strong erosion resistant, and high-strength alloy materials in butterfly valves, they have found widespread use in industrial fields requiring high and low temperatures, strong erosion, and long service life. Existing triple-eccentric metal-sealed butterfly valves typically exhibit good sealing performance during forward flow, but under reverse high pressure conditions, their sealing performance is poor, making it difficult to meet leakage level requirements. Summary of the Invention
[0003] The purpose of this invention is to provide a butterfly valve with high reverse sealing performance, which can solve the above-mentioned problems and reduce the torque loss caused by valve stem deformation.
[0004] According to the technical solution provided by this utility model: a butterfly valve with high reverse sealing performance includes a valve body, a medium hole in the middle of the valve body, valve body holes on both sides of the medium hole, a bracket installed on the side of the valve body, and a bracket hole in the bracket. A valve stem is rotatably installed in the medium hole, valve body hole, and bracket hole. A gasket, a first bushing, a valve plate, a second bushing, and a bearing are sequentially fitted on the valve stem. The first bushing and the second bushing are respectively located in the valve body holes on both sides, the bearing is located in the bracket hole, the valve plate is located in the medium hole, a pressure ring is installed on the outside of the valve plate, and a sealing ring is press-fitted between the valve plate and the pressure ring. A sealing boss adapted to the sealing ring is provided in the valve body. An inner packing is installed between the first bushing, the second bushing, and the valve stem, and an outer packing is installed between the first bushing and the valve body.
[0005] As a further improvement of this utility model, the valve plate is fixedly connected to the valve stem by a pin.
[0006] As a further improvement of this utility model, a retaining plate is installed at the end of the valve stem, and the retaining plate, the gasket, the first bushing, and the valve plate abut against each other axially.
[0007] As a further improvement of this utility model, the inner circumference of the first bushing and the second bushing is provided with a first packing groove, and the outer packing is located between the first bushing and the valve body.
[0008] As a further improvement of this utility model, the first bushing, valve stem, and second bushing are made of forged stainless steel.
[0009] As a further improvement of this utility model, the bearing is a deep groove ball bearing.
[0010] As a further improvement of this utility model, a second bushing, radial packing, pressure sleeve, and pressure block are sequentially fitted on the valve stem; the pressure block is located inside the bracket, and the bolt passes through the pressure block and the bracket and is screwed into the valve body, and the valve body, the second bushing, the radial packing, the pressure sleeve, and the pressure block abut against each other in sequence.
[0011] As a further improvement of this utility model, the bracket is provided with a bearing groove, the bearing is located in the bearing groove, and the bearing pressure plate is installed on the side of the bearing groove by bolts, and the bearing groove and the bearing pressure plate abut against both sides of the outer ring of the bearing.
[0012] The positive and progressive effects of this application are as follows:
[0013] ① The bushing of this utility model adopts an extended design, which reduces the direct contact area between the medium and the valve stem, reduces the deformation of the valve stem, and ensures the fit of the sealing surface.
[0014] ②This utility model reduces the deformation of the valve stem under the force of the medium by using packing, thereby achieving a seal and reducing torque.
[0015] ③ This utility model increases the stress points on the valve stem by using a deep groove ball bearing, thereby reducing the torque loss caused by valve stem deformation.
[0016] ④ The bushing and valve stem of this utility model are made of forged stainless steel, which enhances rigidity, reduces deformation under the force of the medium, and makes the sealing surface fit together to achieve reverse sealing. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation
[0018] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.
[0019] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.
[0020] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this utility model described herein. Furthermore, terms such as "comprising" and "having" mean that in addition to those already listed in "comprising" and "having," other unlisted contents may also be included; for example, a process, method, system, product, or device may include a series of steps or units, not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or devices.
[0021] Due to the angle of the drawing, some parts may not be drawn, but their positions and connections can be understood from the text descriptions.
[0022] like Figure 1 As shown, this utility model is a butterfly valve with high reverse sealing performance, including a valve body 1. The valve body 1 has a medium hole in the middle and valve body holes on both sides. A bracket 11 is installed on the side of the valve body 1, and the bracket 11 has a bracket hole. A valve stem 3 is rotatably installed in the medium hole, valve body hole, and bracket hole. A gasket 14, a first bushing 4, a valve plate 2, a second bushing 5, and a bearing 6 are sequentially fitted onto the valve stem 3. The first bushing 4 and the second bushing 5 are located in the valve body holes on both sides, the bearing 6 is located in the bracket hole, and the valve plate 2 is located in the medium hole. A pressure ring 8 is installed on the outside of the valve plate 2, and a sealing ring 7 is press-fitted between the valve plate 2 and the pressure ring 8. A sealing boss 1-1 adapted to the sealing ring 7 is provided in the valve body 1. Internal packing 9 is installed between the first bushing 4, the second bushing 5, and the valve stem 3, and external packing 10 is installed between the first bushing 4 and the valve body 1.
[0023] The valve plate 2 is fixedly connected to the valve stem 3 by a pin 12.
[0024] A retaining plate 13 is installed at the end of the valve stem 3. The retaining plate 13, gasket 14, first bushing 4, and valve plate 2 abut axially. The inner circumference of the first bushing 4 and the second bushing 5 is provided with a first packing groove for installing the inner packing 9, thereby achieving a seal between the first bushing 4, the second bushing 5, and the valve stem 3. The outer packing 10 is located between the first bushing 4 and the valve body 1, achieving an axial seal between the first bushing 4 and the valve body 1; at the same time, it reduces the displacement and deformation of the valve stem 3, allowing the sealing ring 7 to fit against the sealing boss 1-1, reducing leakage and achieving a reverse seal.
[0025] The first bushing 4, valve stem 3, and second bushing 5 are made of forged stainless steel, which enhances rigidity and reduces deformation caused by high-pressure reverse medium force.
[0026] Considering the inevitable assembly gaps during the assembly process, bearing 6 is a deep groove ball bearing, which fixes the position of valve stem 3, increases the stress points, and reduces the valve opening torque.
[0027] A second bushing 5, radial packing 15, pressure sleeve 16, and pressure block 17 are sequentially fitted onto the valve stem 3. The pressure block 17 is located inside the bracket 11. The bolt 18 passes through the pressure block 17 and the bracket 11 and is then screwed into the valve body 1. The valve body 1, the second bushing 5, the radial packing 15, the pressure sleeve 16, and the pressure block 17 abut against each other in sequence. The radial packing 15 achieves a seal between the valve body 1 and the valve stem 3, while further reducing the displacement and deformation of the valve stem 3.
[0028] The bracket 11 has a bearing groove, the bearing 6 is located in the bearing groove, and the bearing pressure plate 19 is installed on the side of the bearing groove by bolts. The bearing groove and the bearing pressure plate 19 abut against both sides of the outer ring of the bearing 6.
[0029] The inner packing 9, outer packing 10, and radial packing 15 are made of graphite packing.
[0030] The working process of this utility model is as follows:
[0031] During reverse high-pressure sealing, the pressure ring 8, sealing ring 7, first bushing 4, second bushing 5, and valve plate 2 are in direct contact with the medium and subjected to reverse medium force. Considering the existence of assembly clearance, the valve stem 3 undergoes displacement and deformation, causing the sealing ring 7 to detach from the valve body 1, resulting in leakage. The bearing 6, relying on its fitting precision, increases the stress points of the valve stem 3 and reduces the positional offset of the valve stem 3. The inner packing 9 and outer packing 10 fill the space between the first bushing 4, second bushing 5, and valve stem 3 of the valve body 1, compensating for the assembly clearance. The first bushing 4 and second bushing 5 adopt an extended design, reducing the direct contact area between the medium and the valve stem, reducing valve stem deformation, and lowering the torque loss transmitted during valve opening due to valve stem deformation, thus reducing the valve opening torque.
[0032] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of this utility model, and the utility model is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of this utility model, and these modifications and improvements are also considered to be within the protection scope of this utility model.
Claims
1. A butterfly valve with high reverse sealing performance, comprising a valve body (1), wherein the valve body (1) has a medium hole in the middle and valve body holes on both sides of the medium hole, characterized in that, A bracket (11) is installed on the side of the valve body (1). The bracket (11) has a bracket hole. The valve stem (3) is rotatably installed in the medium hole, valve body hole and bracket hole. The valve stem (3) is fitted with a gasket (14), a first bushing (4), a valve plate (2), a second bushing (5) and a bearing (6) in sequence. The first bushing (4) and the second bushing (5) are located in the valve body holes on both sides respectively. The bearing (6) is located in the bracket hole. The valve plate (2) is located in the medium hole. A pressure ring (8) is installed on the outside of the valve plate (2). A sealing ring (7) is press-fitted between the valve plate (2) and the pressure ring (8). A sealing boss (1-1) that matches the sealing ring (7) is provided in the valve body (1). An inner packing (9) is installed between the first bushing (4), the second bushing (5) and the valve stem (3). An outer packing (10) is installed between the first bushing (4) and the valve body (1).
2. The butterfly valve with high reverse sealing performance as described in claim 1, characterized in that, The valve plate (2) is fixedly connected to the valve stem (3) by a pin (12).
3. The butterfly valve with high reverse sealing performance as described in claim 1, characterized in that, A retaining plate (13) is installed at the end of the valve stem (3), and the retaining plate (13), the gasket (14), the first bushing (4), and the valve plate (2) abut against each other axially.
4. The butterfly valve with high reverse sealing performance as described in claim 1, characterized in that, The inner circumference of the first bushing (4) and the second bushing (5) is provided with a first packing groove, and the outer packing (10) is located between the first bushing (4) and the valve body (1).
5. The butterfly valve with high reverse sealing performance as described in claim 1, characterized in that, The first bushing (4), valve stem (3), and second bushing (5) are made of forged stainless steel.
6. The butterfly valve with high reverse sealing performance as described in claim 1, characterized in that, The bearing (6) is a deep groove ball bearing.
7. The butterfly valve with high reverse sealing performance as described in claim 1, characterized in that, The valve stem (3) is fitted with a second bushing (5), radial packing (15), pressure sleeve (16), and pressure block (17) in sequence. The pressure block (17) is located inside the bracket (11). The bolt (18) passes through the pressure block (17) and the bracket (11) and is screwed into the valve body (1). The valve body (1), the second bushing (5), the radial packing (15), the pressure sleeve (16), and the pressure block (17) abut against each other in sequence.
8. The butterfly valve with high reverse sealing performance as described in claim 1, characterized in that, The bracket (11) has a bearing groove, the bearing (6) is located in the bearing groove, and the bearing pressure plate (19) is installed on the side of the bearing groove by bolts. The bearing groove and the bearing pressure plate (19) abut against the two sides of the outer ring of the bearing (6).