High-precision hard alloy wear-resistant valve ball and valve seat assembly

Abstract

The utility model provides a high-precision hard alloy wear-resistant valve ball and valve seat assembly, which belongs to the field of ball valves and comprises a valve body, a first valve seat assembly is arranged on the valve body, a compensation assembly is arranged on the first valve seat assembly, and a second valve seat assembly is arranged in the valve body. By arranging the first valve seat assembly and the compensation assembly, the valve ball is made of a high-hardness and high-strength composite material by taking tungsten carbide as a matrix and cobalt as a binder during use, the valve ball adopts an ultra-precision grinding and polishing technology, the surface roughness Ra is less than or equal to 0.1 mu m, the valve ball is a perfect ball body, and full-angle sealing is designed; abrasion resistance, corrosion resistance, high temperature resistance and high sealing performance are achieved, the long-term stable operation requirement under the extreme working condition is met, the belleville spring provides initial pre-tightening force, material expansion or shrinkage caused by temperature change is compensated, it is ensured that the contact force between the valve seat and the valve ball always meets the sealing requirement, and the service life is prolonged. By means of the design, the problem that a traditional sealing structure is prone to failure at high temperature is solved.

Description

Technical Field

[0001] This utility model relates to the field of ball valves, and more specifically, to a high-precision hard alloy wear-resistant valve ball and valve seat assembly. Background Technology

[0002] A ball valve is a valve in which the opening and closing element (ball) is driven by the valve stem and rotates around the axis of the ball valve. It can also be used for the regulation and control of fluids.

[0003] A search revealed that Chinese Patent Publication No. CN220505867U discloses "a ball valve with adjustable valve seat, comprising a valve body, valve stem, valve ball, first valve seat, and second valve seat. The valve body has a first fluid channel, the valve ball is located within the first fluid channel and fixedly connected to the valve stem, the valve ball has a second fluid channel, the valve stem is rotatably mounted on the valve body, the first valve seat is located on the left side of the valve ball, and the second valve seat is located on the right side of the valve ball. The first valve seat includes a first connecting section abutting against the upper side of the valve ball and a second connecting section abutting against the lower side of the valve ball. It also includes a first drive assembly and a second drive assembly. The first drive assembly includes a mating gear, a transmission screw, a drive gear, and a drive shaft. The valve body has a mating cavity, the drive gear meshes with the mating gear, and the first connecting section is threadedly engaged with the transmission screw. When there is a gap between the valve ball and the first valve seat, the first valve seat is brought closer to the valve ball and fitted with it by rotating the drive shaft. This is a ball valve with adjustable valve seat." However, the following defects still exist:

[0004] Existing valve balls and seats are mostly made of stainless steel or soft sealing materials, which are easily eroded and worn in media containing solid particles or with high flow rates, leading to deformation or leakage of the sealing surface. Secondly, the sealing structure of ordinary ball valves is mostly one-way metal seal or soft seal. Soft seals are prone to aging at high temperatures, and metal seals are prone to gaps due to thermal expansion, making them unsuitable for bidirectional full differential pressure conditions.

[0005] Therefore, we have made improvements and proposed a high-precision hard alloy wear-resistant valve ball and valve seat assembly. Utility Model Content

[0006] The purpose of this utility model is to address the following issues: Firstly, existing valve balls and seats are mostly made of stainless steel or soft sealing materials, which are easily eroded and worn in media containing solid particles or with high flow rates, leading to deformation or leakage of the sealing surface. Secondly, the sealing structure of ordinary ball valves is mostly one-way metal seal or soft seal. At high temperatures, soft seals are prone to aging, and metal seals are prone to gaps due to thermal expansion, making them unable to adapt to bidirectional full differential pressure conditions.

[0007] To achieve the above-mentioned objectives, this utility model provides the following technical solution:

[0008] High-precision, wear-resistant carbide valve ball and seat assembly to improve the above problems.

[0009] The present invention is as follows:

[0010] Includes a valve body, on which a first valve seat assembly is provided, on which a compensation assembly is provided, and inside the valve body a second valve seat assembly;

[0011] The first valve seat assembly includes a first valve groove, a first valve seat, a valve ball, and a valve stem. Two first valve grooves are formed on both sides of the valve body. Two first valve seats are installed inside the two first valve grooves. The valve ball is installed on the two first valve seats and located between the two first valve seats, and is tightly fitted with the first valve seats. The valve stem is rotatably connected to the valve body and inserted into the valve ball. The valve ball is made of a high-hardness, high-strength composite material with tungsten carbide as the matrix and cobalt as the binder. The valve ball is made of ultra-precision grinding and polishing technology, with a surface roughness Ra≤0.1μm. The valve ball is a perfect spherical design for full-angle sealing.

[0012] As a preferred technical solution of this utility model, the compensation component includes a compensation groove and a butterfly spring. The two compensation grooves are respectively opened on one side of the inside of the two first valve grooves, and the butterfly spring is installed inside the compensation groove and is tightly fitted to the first valve seat.

[0013] As a preferred technical solution of this utility model, the second valve seat assembly includes a second valve groove and a second valve seat. The two second valve grooves are opened inside the valve body on the side wall near the first valve groove, and the second valve seat is installed inside the second valve groove and is tightly fitted to the valve ball.

[0014] As a preferred technical solution of this utility model, a spring groove is provided on one side of the interior of the second valve groove, and a compensation spring is installed inside the spring groove. The compensation spring is used to cooperate with the second valve seat.

[0015] As a preferred technical solution of this utility model, the compensating spring is made of Inconel X-750 to ensure that it can provide sufficient sealing force to the second valve seat under various working conditions.

[0016] As a preferred technical solution of this utility model, both the first valve seat and the second valve seat are coated with an anti-adhesion coating to prevent medium crystallization or impurity jamming.

[0017] As a preferred technical solution of this utility model, the surface of the valve ball is coated with a hard alloy chromium carbide coating using supersonic flame spraying technology, which is used for long-term use under harsh working conditions.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] In the solution of this utility model:

[0020] 1. By setting up a first valve seat assembly and a compensation assembly, the valve ball is made of a high-hardness, high-strength composite material with tungsten carbide as the matrix and cobalt as the binder. The valve ball is made of a perfect sphere with full-angle sealing, achieving wear resistance, corrosion resistance, high temperature resistance and high sealing performance, meeting the long-term stable operation requirements under extreme conditions. The butterfly spring provides the initial preload force to compensate for the material expansion or contraction caused by temperature changes, ensuring that the contact force between the valve seat and the valve ball always meets the sealing requirements. This design avoids the problem of traditional sealing structures being prone to failure at high temperatures.

[0021] 2. By setting a second valve seat assembly, the multi-seat design can improve the sealing effect on the valve ball, thereby increasing the service life and performance of the valve ball. Attached Figure Description

[0022] Figure 1 A schematic diagram of the high-precision hard alloy wear-resistant valve ball and valve seat assembly provided by this utility model;

[0023] Figure 2 A front view of the high-precision hard alloy wear-resistant valve ball and valve seat assembly provided by this utility model;

[0024] Figure 3 The high-precision hard alloy wear-resistant valve ball and valve seat assembly provided by this utility model Figure 2 A schematic diagram of the three-dimensional cross-sectional structure at point AA;

[0025] Figure 4 A schematic diagram of the structure of the first valve seat assembly of the high-precision hard alloy wear-resistant valve ball and valve seat assembly provided by this utility model;

[0026] Figure 5 The high-precision hard alloy wear-resistant valve ball and valve seat assembly provided by this utility model Figure 4 Enlarged view of point A in the middle.

[0027] The image shows:

[0028] 1. Valve body; 2. First valve seat assembly; 3. Compensation assembly; 4. Second valve seat assembly; 201. First valve groove; 202. First valve seat; 203. Valve ball; 204. Valve stem; 301. Compensation groove; 302. Butterfly spring; 401. Second valve groove; 402. Second valve seat; 5. Spring groove; 6. Compensation spring. Detailed Implementation

[0029] 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, not all, of the embodiments of this utility model.

[0030] Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely to illustrate some embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0031] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0032] 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.

[0033] like Figure 1-5 As shown, this embodiment proposes a high-precision hard alloy wear-resistant valve ball and valve seat assembly, including a valve body 1, a first valve seat assembly 2 disposed on the valve body 1, a compensation assembly 3 disposed on the first valve seat assembly 2, and a second valve seat assembly 4 disposed inside the valve body 1.

[0034] like Figure 4 As shown, the first valve seat assembly 2 includes a first valve groove 201, a first valve seat 202, a valve ball 203, and a valve stem 204. The two first valve grooves 201 are opened on both sides inside the valve body 1. The two first valve seats 202 are installed inside the two first valve grooves 201. The valve ball 203 is installed on the two first valve seats 202 and located between the two first valve seats 202, and is tightly fitted with the first valve seats 202. The valve stem 204 is rotatably connected to the valve body 1 and inserted into the inside of the valve ball 203. The valve ball 203 is made of a high-hardness, high-strength composite material with tungsten carbide as the matrix and cobalt as the binder. The valve ball 203 is made of ultra-precision grinding and polishing technology, with a surface roughness Ra≤0.1μm. The valve ball 203 is a perfect sphere design with full-angle sealing. When in use, the valve ball 203 is made of tungsten carbide as the matrix and cobalt as the binder to form a high-hardness and high-strength composite material. The valve ball 203 adopts ultra-precision grinding and polishing technology, with a surface roughness Ra≤0.1μm. The valve ball 203 is a perfect sphere design with full-angle sealing, achieving wear resistance, corrosion resistance, high temperature resistance and high sealing performance, meeting the long-term stable operation requirements under extreme working conditions.

[0035] like Figure 5As shown, the compensation assembly 3 includes a compensation groove 301 and a butterfly spring 302. Two compensation grooves 301 are respectively formed inside one side of the two first valve grooves 201. The butterfly spring 302 is installed inside the compensation groove 301 and fits tightly against the first valve seat 202. During use, the butterfly spring 302 provides initial preload to compensate for material expansion or contraction caused by temperature changes, ensuring that the contact force between the first valve groove 201 and the valve ball 203 always meets the sealing requirements. This design avoids the problem of traditional sealing structures easily failing at high temperatures.

[0036] like Figure 5 As shown, the second valve seat assembly 4 includes a second valve groove 401 and a second valve seat 402. The two second valve grooves 401 are formed inside the valve body 1 on the side wall near the first valve groove 201. The second valve seat 402 is installed inside the second valve groove 401 and fits tightly against the valve ball 203. In use, the multi-seat design improves the sealing effect on the valve ball 203, extending its service life and performance.

[0037] like Figure 5 As shown, a spring groove 5 is provided on one side of the interior of the second valve groove 401. A compensating spring 6 is installed inside the spring groove 5. The compensating spring 6 is used in conjunction with the second valve seat 402. During use, the compensating spring 6 can provide a constant thrust to the second valve seat 402, making it tightly adhere to the valve ball 203 and ensuring the sealing level.

[0038] like Figure 5 As shown, the compensating spring 6 is made of Inconel X-750 to ensure sufficient sealing force for the second valve seat 402 under various operating conditions. Inconel X-750 material exhibits excellent fatigue resistance, radiation resistance, oxidation resistance, and corrosion resistance, maintaining stable mechanical properties within a temperature range of -253℃ to 700℃. This avoids the failure issues of traditional springs under high temperature or high pressure, ensuring the long-term stable operation of the second valve seat 402.

[0039] like Figure 4 As shown, both the first valve seat 202 and the second valve seat 402 are coated with an anti-adhesion coating to prevent media crystallization or impurity blockage. During use, the anti-adhesion coating on the first valve seat 202 and the second valve seat 402 prevents media crystallization or impurity blockage.

[0040] like Figure 4 As shown, the surface of valve ball 203 is coated with a hard alloy chromium carbide coating using supersonic flame spraying technology for long-term use under harsh conditions. During use, supersonic flame spraying technology applies wear-resistant powder to the substrate material surface at supersonic speeds, forming a highly bonded and dense coating. Chromium carbide possesses excellent wear resistance and corrosion resistance, enabling long-term use under harsh conditions.

[0041] Specifically, in use, the high-precision hard alloy wear-resistant valve ball and valve seat assembly is as follows: the valve ball 203 is made of tungsten carbide as the matrix and cobalt as the binder, forming a high-hardness, high-strength composite material. The valve ball 203 is made of ultra-precision grinding and polishing technology, with a surface roughness Ra≤0.1μm. The valve ball 203 is designed as a perfect sphere for full-angle sealing, achieving wear resistance, corrosion resistance, high temperature resistance and high sealing performance, meeting the long-term stable operation requirements under extreme working conditions. The butterfly spring 302 provides initial preload to compensate for the material expansion or contraction caused by temperature changes, ensuring that the contact force between the valve seat and the valve ball 203 always meets the sealing requirements. This design avoids the problem of traditional sealing structures being prone to failure at high temperatures.

[0042] All technical features in this embodiment can be freely combined according to actual needs.

[0043] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A high-precision hard alloy wear-resistant valve ball and valve seat assembly, comprising a valve body (1), characterized in that, The valve body (1) is provided with a first valve seat assembly (2), the first valve seat assembly (2) is provided with a compensation assembly (3), and the valve body (1) is provided with a second valve seat assembly (4). The first valve seat assembly (2) includes a first valve groove (201), a first valve seat (202), a valve ball (203), and a valve stem (204). The two first valve grooves (201) are opened on both sides inside the valve body (1). The two first valve seats (202) are installed inside the two first valve grooves (201). The valve ball (203) is installed on the two first valve seats (202) and located between the two first valve seats (202), and is tightly fitted with the first valve seats (202). The valve stem (204) is rotatably connected to the valve body (1) and inserted into the inside of the valve ball (203). The valve ball (203) is made of a composite material with tungsten carbide as the matrix and cobalt as the binder, forming a high-hardness and high-strength composite material. The valve ball (203) is made of ultra-precision grinding and polishing technology, with a surface roughness Ra≤0.1μm. The valve ball (203) is a perfect sphere design with full-angle sealing.

2. The high-precision hard alloy wear-resistant valve ball and valve seat assembly according to claim 1, characterized in that, The compensation component (3) includes a compensation groove (301) and a butterfly spring (302). The two compensation grooves (301) are respectively opened on one side of the inside of the two first valve grooves (201). The butterfly spring (302) is installed inside the compensation groove (301) and fits tightly against the first valve seat (202).

3. The high-precision hard alloy wear-resistant valve ball and valve seat assembly according to claim 1, characterized in that, The second valve seat assembly (4) includes a second valve groove (401) and a second valve seat (402). The two second valve grooves (401) are opened on the side wall of the valve body (1) near the first valve groove (201). The second valve seat (402) is installed inside the second valve groove (401) and fits tightly against the valve ball (203).

4. The high-precision hard alloy wear-resistant valve ball and valve seat assembly according to claim 3, characterized in that, A spring groove (5) is provided on one side of the interior of the second valve groove (401), and a compensation spring (6) is installed inside the spring groove (5). The compensation spring (6) is used to cooperate with the second valve seat (402).

5. A high-precision hard alloy wear-resistant valve ball and valve seat assembly according to claim 4, characterized in that, The compensating spring (6) is made of Inconel X-750 and is used to ensure that the second valve seat (402) can be provided with sufficient sealing force under various operating conditions.

6. The high-precision hard alloy wear-resistant valve ball and valve seat assembly according to claim 1, characterized in that, The surfaces of the first valve seat (202) and the second valve seat (402) are coated with an anti-adhesion coating to prevent medium crystallization or impurity jamming.

7. A high-precision hard alloy wear-resistant valve ball and valve seat assembly according to claim 1, characterized in that, The surface of the valve ball (203) is coated with a hard alloy chromium carbide coating using supersonic flame spraying technology, which is intended for long-term use under harsh working conditions.

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