Valve seat and double-eccentric butterfly valve

By designing valve seats of the first and second sealing parts with different extrusion deformation variables, the problem of large valve design torque and limited application scope in the prior art is solved, and adaptability and standardized production under different sealing pressures are achieved.

CN222836271UActive Publication Date: 2025-05-06NEWAY VALVE (SUZHOU) CO LTD
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Patent Information

Application Number
CN202421944869.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-08-12
Publication Date
2025-05-06
Estimated Expiration
2034-08-12

AI Technical Summary

Technical Problem

In the prior art, conventional valve designs are often in a state of high extrusion, resulting in large torque, wide application area, but not suitable for situations where sealing pressure is required, resulting in multiple sets of designs that are not conducive to standardization and batching.

Method used

A valve seat is designed, including a skeleton and a flexible seal, the seal includes a first sealing part and a second sealing part. The extrusion deformation of the first sealing part is smaller than that of the second sealing part, and different sealing pressure conditions are adapted to the sealing part by replacing the sealing part.

Benefits of technology

It is realized that appropriate sealing parts are replaced under different sealing pressures to control torque and sealing pressure, expand the scope of application of the valve seat, reduce multiple designs, and promote standardized and mass production.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a valve seat and a double eccentric butterfly valve, the valve seat comprises a framework and a flexible sealing element, the flexible sealing element wraps the outer side of the framework, and the flexible sealing element comprises a first sealing part and a second sealing part; and the extrusion deformation quantity of the first sealing part is smaller than that of the second sealing part. The flexible sealing piece is provided with the first sealing part and the second sealing part, and the extrusion deformation quantity of the first sealing part is smaller than that of the second sealing part. When high sealing pressure is needed in use, the second sealing part is used for sealing, and due to extrusion sealing, the extrusion amount determines the torque of the valve and the sealing pressure borne by the valve, namely the larger the extrusion amount is, the higher the sealing pressure borne by the valve is, and the sealing effect is better. Therefore, the second sealing part is used for sealing, and the requirement for high sealing pressure can be met. And when the sealing pressure needs to be low, the first sealing part is used for sealing, so that the application range of the valve seat is wider.
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Description

Technical Field

[0001] The utility model relates to the technical field of oil refining and chemical industry valves, in particular to a valve seat and a double eccentric butterfly valve. Background Art

[0002] Double eccentric butterfly valve, that is, the valve disc sealing surface has an eccentricity to the left and right and up and down relative to the valve disc rotation axis. In this way, the valve disc sealing surface can be completely separated from the vulcanized valve seat after the valve disc is opened, reducing friction and increasing the life of the valve seat.

[0003] The sealing principle of the valve seat and the valve disc sealing surface is extrusion sealing, that is, after the valve disc sealing surface contacts the vulcanized valve seat, the valve disc sealing surface squeezes the vulcanized valve seat sealing surface, that is, there is a certain amount of extrusion, so as to achieve sealing. Because it is an extrusion seal, the extrusion amount determines the torque of the valve and the sealing pressure that the valve bears. That is, the greater the extrusion amount, the higher the sealing pressure that the valve can withstand, but at this time the torque becomes relatively larger. On the contrary, the smaller the extrusion amount, the smaller the sealing pressure that the valve can withstand, and the smaller the torque.

[0004] Conventional valve designs are often designed for a high extrusion volume. This way, the valve has a wide range of applications and covers a wide pressure range, but the torque is large. If the required pressure is not high and the torque needs to be controlled, it is often only possible to replace the valve seat with a small extrusion volume. This results in multiple sets of designs, which is not conducive to standardization and mass production. Utility Model Content

[0005] Therefore, the technical problem to be solved by the utility model is that the conventional valve design in the prior art is often designed for a high extrusion volume. In this way, the valve has a wide range of applicability and covers a wide pressure range, but the torque is large. If the required pressure is not high and the torque needs to be controlled, it is often necessary to replace the valve seat with a small extrusion volume. This results in multiple sets of designs, which is not conducive to standardization and mass production.

[0006] To this end, the utility model provides a valve seat, comprising:

[0007] skeleton;

[0008] A flexible sealing member wrapped around the outside of the frame, wherein the flexible sealing member comprises a first sealing portion and a second sealing portion;

[0009] Wherein, the extrusion deformation amount of the first sealing part is smaller than the extrusion deformation amount of the second sealing part.

[0010] Optionally, the first sealing portion is connected to the second sealing portion, and an included angle a between the first sealing portion and the valve seat axis is greater than an included angle b between the second sealing portion and the valve seat axis.

[0011] Optionally, the thickness of the first sealing portion is smaller than the thickness of the second sealing portion.

[0012] Optionally, the flexible seal is vulcanized rubber.

[0013] Optionally, the skeleton is annular, and the first sealing portion and the second sealing portion are located on an inner ring of the skeleton.

[0014] Optionally, the skeleton is provided with positive and negative countersunk holes.

[0015] A double eccentric butterfly valve, comprising:

[0016] Valve body;

[0017] A valve stem, one end of which is inserted in the valve body;

[0018] A valve flap is disposed in the valve body and fixed to the valve stem, and a sealing surface is provided on the valve flap;

[0019] The valve seat is fixed to the valve body, and the first sealing portion or the second sealing portion on the flexible sealing member of the valve seat is suitable for abutting against the sealing surface on the valve disc.

[0020] Optionally, the valve seat has a first sealing state and a second sealing state;

[0021] In the first sealing state, the first sealing portion abuts against the valve flap;

[0022] In the second sealing state, the second sealing portion abuts against the valve flap;

[0023] The elastic deformation amount of the first sealing portion is smaller than the elastic deformation amount of the second sealing portion.

[0024] Optionally, the valve seat has a first mounting surface and a second mounting surface, and the first mounting surface and the second mounting surface are arranged opposite to each other;

[0025] The first mounting surface is connected to the valve body, and the valve seat is in a first sealing state;

[0026] The second mounting surface is connected to the valve body, and the valve seat is in a second sealing state.

[0027] A double eccentric butterfly valve, comprising:

[0028] a valve body having a sealing surface disposed thereon;

[0029] A valve stem, one end of which is inserted in the valve body;

[0030] A valve disc, disposed in the valve body and fixed to the valve stem;

[0031] The valve seat is fixed to the valve flap, and the first sealing portion or the second sealing portion on the flexible sealing member of the valve seat is suitable for abutting against the sealing surface on the valve body.

[0032] The valve seat and double eccentric butterfly valve provided by the utility model have the following advantages:

[0033] 1. The utility model provides a valve seat, including a frame and a flexible seal, wherein the flexible seal is wrapped around the outside of the frame, and the flexible seal includes a first sealing part and a second sealing part; the extrusion deformation amount of the first sealing part is smaller than the extrusion deformation amount of the second sealing part.

[0034] The valve seat of this structure has a first sealing part and a second sealing part by setting a flexible sealing member, and the extrusion deformation of the first sealing part is smaller than the extrusion deformation of the second sealing part. When a high sealing pressure is required during use, the second sealing part is used for sealing. Since it is an extrusion seal, the extrusion amount determines the torque of the valve and the sealing pressure that the valve bears, that is, the greater the extrusion amount, the higher the sealing pressure that the valve can withstand. Therefore, using the second sealing part for sealing can meet the situation where a high sealing pressure is required. On the contrary, when a low sealing pressure is required, the first sealing part is used for sealing, so that the valve seat has a wider range of applications.

[0035] 2. The utility model provides a valve seat, wherein the first sealing portion is connected to the second sealing portion, and an angle a between the first sealing portion and the valve seat axis is greater than an angle b between the second sealing portion and the valve seat axis.

[0036] The valve seat of this structure can realize the difference in the amount of extrusion deformation of the first sealing portion and the second sealing portion by utilizing the difference in the angle between the sealing portion and the axis of the valve seat when used for sealing.

[0037] 3. The utility model provides a double eccentric butterfly valve, comprising a valve body, a valve stem, a valve disc and the valve seat in Example 1, wherein the lower end of the valve stem is inserted in the valve body; the valve disc is arranged in the valve body and fixed to the valve stem, a sealing surface is provided on the valve disc, the valve seat is fixed to the valve body, and the first sealing portion or the second sealing portion on the flexible sealing member of the valve seat is suitable for abutting against the sealing surface on the valve disc.

[0038] The double eccentric butterfly valve of this structure has a valve seat with a first sealing part or a second sealing part, and the amount of extrusion deformation of the first sealing part caused by the sealing surface on the valve disc is smaller than the amount of extrusion deformation of the second sealing part caused by the sealing surface on the valve disc. Therefore, when facing different sealing pressure conditions, the first sealing part or the second sealing part can be replaced to abut the sealing surface on the valve disc, thereby improving the scope of application. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 This is a schematic structural view of the valve seat provided in Example 1 of the utility model;

[0041] Figure 2 for Figure 1 A magnified view of the structure at the center circle B;

[0042] Figure 3 This is a schematic diagram of the sealing structure of the second sealing portion in the valve seat provided in Example 1 of the utility model;

[0043] Figure 4 This is a schematic diagram of the sealing structure of the first sealing portion in the valve seat provided in Example 1 of the utility model;

[0044] Figure 5 This is a schematic structural view of a double eccentric butterfly valve provided in Example 2 of the utility model;

[0045] Figure 6 This is a schematic structural view of the double eccentric butterfly valve provided in Example 3 of the utility model.

[0046] Description of reference numerals:

[0047] 1- Skeleton;

[0048] 2- Flexible seal;

[0049] 3- first sealing part;

[0050] 4- second sealing part;

[0051] 5-valve body;

[0052] 6-valve stem;

[0053] 7-valve disc;

[0054] 8- Sealing surface. DETAILED DESCRIPTION

[0055] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0056] In the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, the technical features involved in the different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0057] Example 1

[0058] This embodiment provides a valve seat, such as Figures 1 to 4 As shown, it includes a skeleton 1 and a flexible seal 2, wherein the flexible seal 2 is wrapped around the outside of the skeleton 1, and the flexible seal 2 includes a first sealing portion 3 and a second sealing portion 4; the extrusion deformation amount of the first sealing portion 3 is smaller than the extrusion deformation amount of the second sealing portion 4.

[0059] In the above structure, the flexible seal 2 has a first sealing portion 3 and a second sealing portion 4, and the first sealing portion 3 is subjected to a smaller extrusion deformation than the second sealing portion 4. Figure 3 As shown, the second sealing part 4 is used for sealing. Since it is an extrusion seal, the extrusion amount determines the torque of the valve and the sealing pressure that the valve bears. That is, the greater the extrusion amount, the higher the sealing pressure that the valve can withstand. Therefore, the use of the second sealing part 4 for sealing can meet the situation where a high sealing pressure is required. On the contrary, when a low sealing pressure is required, such as Figure 4 As shown, the first sealing portion 3 is used for sealing, so that the valve seat has a wider application range.

[0060] Specifically, Figure 2 As shown, the first sealing part 3 and the second sealing part 4 are connected, and the angle a between the first sealing part 3 and the valve seat axis is greater than the angle b between the second sealing part 4 and the valve seat axis. This structural design can achieve the difference in the amount of extrusion deformation of the first sealing part 3 and the second sealing part 4 by utilizing the difference in the angle between the sealing part and the valve seat axis when the seal is used.

[0061] Furthermore, the thickness of the first sealing part 3 is smaller than that of the second sealing part 4 , the flexible sealing element 2 is made of vulcanized rubber, the skeleton 1 is annular, and the first sealing part 3 and the second sealing part 4 are located on the inner circle of the skeleton 1 .

[0062] In this embodiment, the skeleton 1 is provided with positive and negative countersunk holes, and the countersunk holes are evenly distributed so that the valve seat can be installed on the valve body 5 in both positive and negative directions.

[0063] The valve seat provided in this embodiment is configured such that the included angle a between the first sealing portion 3 and the valve seat axis is larger than the included angle b between the second sealing portion 4 and the valve seat axis, thereby achieving that the extrusion deformation amount of the first sealing portion 3 is smaller than the extrusion deformation amount of the second sealing portion 4, thereby providing an applicable range of the valve seat.

[0064] Example 2

[0065] This embodiment provides a double eccentric butterfly valve, such as Figure 5 As shown, it includes a valve body 5, a valve stem 6, a valve flap 7 and the valve seat in Example 1, the lower end of the valve stem 6 is inserted in the valve body 5; the valve flap 7 is arranged in the valve body 5 and fixed to the valve stem 6, the valve flap 7 is provided with a sealing surface 8, the valve seat is fixed to the valve body 5, and the first sealing portion 3 or the second sealing portion 4 on the valve seat flexible seal 2 is suitable for abutting against the sealing surface 8 on the valve flap 7.

[0066] In this embodiment, the valve seat has a first sealing state and a second sealing state. In the first sealing state, Figure 4 As shown, the first sealing portion 3 abuts against the valve flap 7; in the second sealing state, as shown Figure 3 As shown, the second sealing portion 4 abuts against the valve flap 7 , and the elastic deformation of the first sealing portion 3 is smaller than that of the second sealing portion 4 .

[0067] Specifically, the valve seat has a first mounting surface and a second mounting surface, the first mounting surface and the second mounting surface are arranged opposite to each other, the first mounting surface is connected to the valve body 5, and the valve seat is in a first sealing state, and the second mounting surface is connected to the valve body 5, and the valve seat is in a second sealing state.

[0068] The above structure can change the portion of the valve flap 7 that the sealing surface 8 abuts against by replacing the first mounting surface and the second mounting surface of the valve seat, thereby achieving a change between the first sealing state and the second sealing state.

[0069] The double eccentric butterfly valve provided in this embodiment has a first sealing part 3 or a second sealing part 4 as the valve seat, and the amount of extrusion deformation of the first sealing part 3 caused by the sealing surface 8 on the valve disc 7 is smaller than the amount of extrusion deformation of the second sealing part 4 caused by the sealing surface 8 on the valve disc 7. Therefore, when facing different sealing pressure conditions, the first sealing part 3 or the second sealing part 4 can be replaced to abut against the sealing surface 8 on the valve disc 7, thereby improving the scope of application.

[0070] Example 3

[0071] This embodiment provides a double eccentric butterfly valve, which is different from the double eccentric butterfly valve provided in Embodiment 2 in that:

[0072] In this embodiment, if Figure 6 As shown, a sealing surface is provided on the valve body 5, a valve flap 7 is provided in the valve body 5 and fixed to the valve stem 6; the valve seat is fixed to the valve flap 7, and the first sealing portion 3 or the second sealing portion 4 on the valve seat flexible seal 2 is suitable for abutting against the sealing surface on the valve body 5.

[0073] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A valve seat, characterized in that: include: Skeleton (1); A flexible sealing member (2) wrapped around the outside of the frame (1), wherein the flexible sealing member (2) comprises a first sealing portion (3) and a second sealing portion (4); The amount of extrusion deformation of the first sealing portion (3) is smaller than the amount of extrusion deformation of the second sealing portion (4).

2. The valve seat according to claim 1, characterized in that: The first sealing portion (3) and the second sealing portion (4) are connected, and an angle a between the first sealing portion (3) and the valve seat axis is greater than an angle b between the second sealing portion (4) and the valve seat axis.

3. The valve seat according to claim 2, characterized in that: The thickness of the first sealing portion (3) is smaller than the thickness of the second sealing portion (4).

4. The valve seat according to any one of claims 1 to 3, characterized in that: The flexible sealing element (2) is made of vulcanized rubber.

5. The valve seat according to any one of claims 1 to 3, characterized in that: The skeleton (1) is annular, and the first sealing portion (3) and the second sealing portion (4) are located on the inner ring of the skeleton (1).

6. The valve seat according to claim 5, characterized in that The frame (1) is provided with positive and negative countersunk holes.

7. A double eccentric butterfly valve, characterized in that: include: Valve body (5); A valve stem (6), one end of which is inserted into the valve body (5); A valve flap (7) is arranged in the valve body (5) and fixed to the valve stem (6), and a sealing surface (8) is provided on the valve flap (7); The valve seat according to any one of claims 1 to 6 is fixed to the valve body (5), and the first sealing portion (3) or the second sealing portion (4) on the flexible sealing member (2) in the valve seat is suitable for abutting against the sealing surface (8) on the valve flap (7).

8. The double eccentric butterfly valve according to claim 7, characterized in that: The valve seat has a first sealing state and a second sealing state; In the first sealing state, the first sealing portion (3) abuts against the valve flap (7); In the second sealing state, the second sealing portion (4) abuts against the valve flap (7); The elastic deformation amount of the first sealing portion (3) is smaller than the elastic deformation amount of the second sealing portion (4).

9. The double eccentric butterfly valve according to claim 8, characterized in that: The valve seat has a first mounting surface and a second mounting surface, and the first mounting surface and the second mounting surface are arranged opposite to each other; The first mounting surface is connected to the valve body (5), and the valve seat is in a first sealing state; The second mounting surface is connected to the valve body (5), and the valve seat is in a second sealing state.

10. A double eccentric butterfly valve, characterized in that: include: A valve body (5) having a sealing surface provided thereon; A valve stem (6), one end of which is inserted into the valve body (5); A valve flap (7) is disposed in the valve body (5) and fixed to the valve stem (6); The valve seat according to any one of claims 1 to 6 is fixed to the valve flap (7), and the first sealing portion (3) or the second sealing portion (4) on the flexible sealing member (2) in the valve seat is suitable for abutting against the sealing surface on the valve body (5).