A replaceable valve seat tool

Abstract

The application relates to a replaceable valve seat tool and relates to the technical field of fluid control component assembly and maintenance tools, and comprises a valve body, a valve seat body, a valve seat necking tool and a valve seat taking-out tool. The application is characterized in that the valve seat body is tightly combined with the valve body through interference fit, the annular flange is limited in position through cooperation with the limiting step of the pressing sleeve, the scale line of the positioning ring, the spherical sealing surface of the valve seat body and the conical sealing ring of the valve body, and the elastic sealing ring on the annular flange. When installation, the valve seat body is tightly combined with the valve body through interference fit, and the annular flange is limited in position through cooperation with the limiting step to limit axial displacement; the scale line of the positioning ring ensures that the height difference between the top of the valve seat body and the sealing surface of the valve body is accurately controllable; the spherical sealing surface and the conical sealing ring form linear contact sealing, and the elastic sealing ring is matched with the end face of the valve body port to form a multiple sealing structure; and the problem of leakage rate fluctuation caused by inaccurate height difference control of traditional tools is solved.

Description

Technical Field

[0001] This application relates to the field of tooling technology for assembling and repairing fluid control components, and in particular to a tooling with a replaceable valve seat. Background Technology

[0002] In fluid control systems of the semiconductor and photovoltaic industries, diaphragm valves are widely used as core components for flow control of gases and corrosive media. As a critical sealing element of the valve, the valve seat is subject to long-term fluid erosion, wear, particulate matter compression, and corrosion, making it prone to pitting and defects, leading to decreased sealing performance. In existing technologies, valve seats are typically pressed into the valve body using a constricting tool (as described in patent CN114643306B) and fixed by deformation. However, this method has the following drawbacks: high leakage risk, as traditional tooling relies solely on mechanical deformation to fix the valve seat, making it difficult to accurately control the height difference between the valve seat and the valve body sealing surface, resulting in fluctuations in fluid leakage rate; high maintenance costs, as the entire valve body must be scrapped after the valve seat wears out, and replacement requires various specialized tools, occupying a large space and being cumbersome; and low assembly efficiency, as existing tooling cannot simultaneously achieve rapid installation and removal of the valve seat, especially in space-constrained environments such as semiconductor cleanrooms, where frequent valve seat replacements can easily cause secondary contamination. Therefore, this paper proposes a tooling solution with a replaceable valve seat. Utility Model Content

[0003] The purpose of this application is to provide a tooling with a replaceable valve seat, which has the advantages of precise control of sealing height, reduced leakage risk, easy replacement of valve seat, and improved operation convenience.

[0004] The tooling for a replaceable valve seat provided in this application adopts the following technical solution: it includes a valve body, a valve seat body, a valve seat closing tooling, and a valve seat removal tooling. The outer periphery of the valve seat body forms an interference fit with the inner wall of the valve seat mounting hole of the valve body, and the top of the valve seat body is provided with an annular flange. The valve seat closing tooling includes a clamping sleeve and a positioning ring. The inner wall of the clamping sleeve is provided with a limiting step that matches the annular flange. The positioning ring is fitted on the outer side of the clamping sleeve and can slide axially. The valve seat removal tooling includes a pull rod and an expansion head. The expansion head is conical and can be moved axially by the pull rod to open the inner wall of the valve seat body. By adopting the above technical solution, the valve seat is securely installed without loosening through the interference fit between the valve seat body and the valve body and the fit between the annular flange and the limiting step of the clamping sleeve; the axial sliding design of the positioning ring provides a basis for height adjustment; the conical expansion head can open the inner wall of the valve seat through the pull rod drive, so as to realize the valve seat can be disassembled separately without scrapping the valve body, reducing maintenance costs, while meeting the core functional requirement of replaceable valve seat.

[0005] Preferably, the valve seat mounting hole of the valve body is provided with a depth positioning groove at the bottom, and the bottom of the valve seat body is provided with a positioning protrusion that cooperates with the depth positioning groove.

[0006] By adopting the above technical solution, the deep positioning groove of the valve body cooperates with the positioning protrusion of the valve seat body to achieve precise radial positioning during valve seat installation, avoid misalignment of the sealing surface caused by installation offset, reduce leakage risk, and improve assembly consistency.

[0007] Preferably, the positioning ring of the valve seat closing tool is provided with scale lines on its outer circumference to accurately control the height difference between the top of the valve seat body and the valve body sealing surface.

[0008] By adopting the above technical solution, the scale lines on the outer periphery of the positioning ring can accurately control the height difference between the top of the valve seat body and the valve body sealing surface, avoiding sealing failure caused by height deviation, reducing leakage rate fluctuations, ensuring stable fluid flow, and meeting the precision control needs of the semiconductor and photovoltaic industries.

[0009] Preferably, the expansion head surface of the valve seat removal tool is provided with anti-slip teeth.

[0010] By adopting the above technical solution, the anti-slip teeth on the surface of the expansion head enhance the friction with the inner wall of the valve seat body, preventing slippage during disassembly, making the opening operation more labor-saving and efficient, and improving the convenience of valve seat replacement, especially suitable for cleanroom scenarios with limited space.

[0011] Preferably, the valve seat body is made of tungsten carbide coated stainless steel with an ultra-high surface roughness, which can meet the low leakage requirements in precision sealing scenarios.

[0012] By adopting the above technical solutions, the valve seat body is made of tungsten carbide coated stainless steel, which improves its resistance to erosion and corrosion and extends its service life; the ultra-high smoothness surface reduces fluid flow resistance and enhances the sealing surface fit, meeting the low leakage requirements in precision sealing scenarios.

[0013] Preferably, the valve body and the valve seat body have a tight fit, and the sealing surface of the valve seat body is designed with a spherical surface, forming a line contact seal with the conical sealing ring of the valve body.

[0014] By adopting the above technical solutions, the tight fit between the valve body and the valve seat further enhances installation stability. The line contact design between the spherical sealing surface and the conical sealing ring improves sealing accuracy, reduces media leakage paths, adapts to high-pressure and corrosive media environments, and enhances sealing reliability.

[0015] Preferably, the clamping sleeve of the valve seat closing tool is provided with an axial slider on its outer periphery, and the inner wall of the positioning ring is provided with a guide groove that cooperates with the slider. The guide groove can slide along the slider to limit the circumferential rotation of the positioning ring.

[0016] By adopting the above technical solution, the axial slider of the clamping sleeve cooperates with the guide groove of the positioning ring to restrict the circumferential rotation of the positioning ring, ensuring that the scale line is always aligned with the reference, avoiding height control errors caused by the positioning ring offset during operation, and improving installation accuracy and efficiency.

[0017] Preferably, the valve seat body has an annular groove on its annular flange, and an elastic sealing ring is embedded in the annular groove. After the valve seat body is installed, the elastic sealing ring forms a sealing contact with the end face of the valve body.

[0018] By adopting the above technical solution, the annular groove of the annular flange and the elastic sealing ring form an auxiliary seal with the end face of the valve body port, and together with the spherical line contact seal, they form a double sealing structure, which further reduces the risk of leakage, adapts to harsh sealing scenarios, and enhances the environmental adaptability of the tooling.

[0019] In summary, this application includes at least one of the following beneficial technical effects: 1. This tooling for a replaceable valve seat utilizes an interference fit between the valve seat body and the valve body, a limiting step fit between the annular flange and the clamping sleeve, a scale line on the positioning ring, a spherical sealing surface of the valve seat body and a conical sealing ring of the valve body, and an elastic sealing ring on the annular flange. During installation, the valve seat body is tightly fitted to the valve body through the interference fit, and the annular flange and the limiting step fit restrict axial displacement. The scale line on the positioning ring ensures precise control of the height difference between the top of the valve seat body and the sealing surface of the valve body. The spherical sealing surface and the conical sealing ring form a line contact seal, which, combined with the fit between the elastic sealing ring and the end face of the valve body port, forms a multi-seal structure. This solves the leakage rate fluctuation problem caused by inaccurate height difference control in traditional tooling. The design can withstand long-term erosion by gases and corrosive media, significantly improving sealing stability. It features a detachable design with an expansion head and anti-slip teeth for removing the valve seat, and the valve seat body is separated from the valve body. When the valve seat body needs replacement due to wear or corrosion, a pull rod drives the conical expansion head into the inner cavity of the valve seat body. The anti-slip teeth enhance friction, opening the inner wall of the valve seat body to overcome interference fit resistance, allowing the valve seat body to be removed separately from the valve body. After replacing the new valve seat body, the installation process can be repeated. This avoids the problem of having to scrap the entire valve body when the valve seat is damaged, as in existing technologies. Only the valve seat body needs to be replaced to restore valve function, significantly reducing maintenance costs. It is especially suitable for the long-term use of high-value valve bodies in the semiconductor and photovoltaic industries.

[0020] 2. This tooling for replaceable valve seats integrates a clamping sleeve and a positioning ring in the valve seat closing tooling, an axial slider of the clamping sleeve and a guide groove of the positioning ring, and a valve seat removal tooling. During installation, the positioning ring slides along the axial slider of the clamping sleeve, and the guide groove restricts the circumferential rotation of the positioning ring, ensuring precise alignment of the scale lines and quick height positioning. During disassembly, the conical structure of the expansion head can efficiently open the valve seat in confined spaces without complex operations, solving the problems of cumbersome operation and the need to carry multiple tools in traditional tooling, simplifying the assembly process, and adapting to space-constrained scenarios such as semiconductor cleanrooms, reducing frequent... The risk of secondary contamination during valve seat replacement is minimized. The tungsten carbide-coated stainless steel material of the valve seat body, along with the tight fit between the valve body and the seat, provides an anti-wear and anti-corrosion protective layer. The stainless steel substrate ensures structural strength. The tight fit design prevents the valve seat from loosening under long-term vibration and fluid impact, maintaining a stable fit. It can withstand highly corrosive media such as hydrofluoric acid and particulate matter compression, extending the service life of the valve seat body and making it suitable for the demanding fluid control conditions in the semiconductor and photovoltaic industries. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this application; Figure 2 This is a schematic diagram of the valve seat closing tooling and a portion of the valve body in this application. Figure 3 This is a schematic diagram of the valve seat removal tooling and a portion of the valve body in this application. Figure 4 This is a partial structural schematic diagram of the valve seat body of this application; Figure 5 This is a partial structural diagram of the valve seat closing tooling of this application; Figure 6 This is a partial structural diagram of the tooling for removing the valve seat in this application.

[0022] In the picture: 1. Valve body; 2. Valve seat body; 21. Annular flange; 211. Annular groove; 3. Valve seat closing fixture; 31. Compression sleeve; 311. Limiting step; 32. Positioning ring; 4. Valve seat removal fixture; 41. Expansion head. Detailed Implementation

[0023] The following is in conjunction with the appendix Figure 1 - Appendix Figure 6 This application will be described in further detail below.

[0024] Example 1: A tooling with a replaceable valve seat, referring to... Figure 2 , Figure 3 and Figure 4The valve body includes a valve body 1, a valve seat body 2, a valve seat closing fixture 3, and a valve seat removal fixture 4. The outer periphery of the valve seat body 2 forms an interference fit with the inner wall of the valve seat mounting hole of the valve body 1, and the top of the valve seat body 2 is provided with an annular flange 21. The valve seat closing fixture 3 includes a clamping sleeve 31 and a positioning ring 32. The inner wall of the clamping sleeve 31 is provided with a limiting step 311 that matches the annular flange 21. The positioning ring 32 is fitted onto the outer side of the clamping sleeve 31 and can slide axially. The valve seat removal fixture 4 includes a pull rod and an expansion head 41. The expansion head 41 is conical and can be axially moved by the pull rod to open the inner wall of the valve seat body 2. Through the interference fit between the valve seat body 2 and the valve body 1, and the cooperation between the annular flange 21 and the limiting step 311 of the clamping sleeve 31, the valve seat is ensured to be firmly installed and not loose. The axial sliding design of the positioning ring 32 provides a basis for height adjustment. The conical expansion head 41 can open the inner wall of the valve seat by being driven by the pull rod, so that the valve seat can be disassembled separately without scrapping the valve body 1, reducing maintenance costs, while meeting the core functional requirement of a replaceable valve seat.

[0025] Reference Figure 1 , Figure 2 and Figure 5 The valve body 1 has a deep positioning groove at the bottom of the valve seat mounting hole, and the valve seat body 2 has a positioning protrusion at the bottom that mates with the deep positioning groove. The positioning ring 32 of the valve seat closing tool 3 has scale lines on its outer circumference, which are used to precisely control the height difference between the top of the valve seat body 2 and the sealing surface of the valve body 1. The deep positioning groove of the valve body 1 and the positioning protrusion of the valve seat body 2 mate to achieve radial precision positioning of the valve seat during installation, avoid misalignment of the sealing surface caused by installation offset, reduce leakage risk, improve assembly consistency, and the scale lines on the outer circumference of the positioning ring 32 can precisely control the height difference between the top of the valve seat body 2 and the sealing surface of the valve body 1, avoid sealing failure caused by height deviation, reduce leakage rate fluctuation, ensure stable fluid flow, and meet the precision control requirements of the semiconductor and photovoltaic industries.

[0026] Reference Figure 1 , Figure 3 and Figure 6 The expansion head 41 of the valve seat removal tool 4 has anti-slip serrations on its surface. The valve seat body 2 is made of tungsten carbide coated stainless steel with an ultra-high surface roughness, which can meet the low leakage requirements in precision sealing scenarios. The anti-slip serrations on the surface of the expansion head 41 enhance the friction with the inner wall of the valve seat body 2, preventing slippage during disassembly and making the opening operation more labor-saving and efficient, improving the convenience of valve seat replacement. It is especially suitable for cleanroom scenarios with limited space. The valve seat body 2 is made of tungsten carbide coated stainless steel, which improves the erosion resistance and corrosion resistance and extends the service life. The ultra-high surface roughness reduces fluid flow resistance and enhances the sealing surface fit, meeting the low leakage requirements in precision sealing scenarios.

[0027] Reference Figure 1 , Figure 4 and Figure 5The valve body 1 and valve seat body 2 have a tight fit, and the sealing surface of the valve seat body 2 adopts a spherical design, forming a line contact seal with the conical sealing ring of the valve body 1. The clamping sleeve 31 of the valve seat closing tool 3 has an axial slider on its outer periphery, and the inner wall of the positioning ring 32 has a guide groove that cooperates with the slider. The guide groove can slide along the slider to limit the circumferential rotation of the positioning ring 32. The annular flange 21 of the valve seat body 2 has an annular groove 211, and an elastic sealing ring is embedded in the annular groove 211. After the valve seat body 2 is installed, the elastic sealing ring forms a sealing contact with the end face of the valve body 1. The tight fit between the valve body 1 and the valve seat body 2 further enhances the installation stability. The line contact design between the sealing surface and the conical sealing ring improves sealing accuracy, reduces media leakage paths, adapts to high-pressure and corrosive media environments, and enhances sealing reliability. The axial slider of the clamping sleeve 31 cooperates with the guide groove of the positioning ring 32 to restrict the circumferential rotation of the positioning ring 32, ensuring that the scale line is always aligned with the reference, avoiding height control errors caused by the offset of the positioning ring 32 during operation, and improving installation accuracy and efficiency. The annular groove 211 of the annular flange 21 and the elastic sealing ring form an auxiliary seal with the end face of the valve body 1 port, which, together with the spherical line contact seal, constitutes a double sealing structure, further reducing the risk of leakage, adapting to harsh sealing scenarios, and enhancing the environmental adaptability of the tooling.

[0028] In this embodiment, through the interference fit between the valve seat body 2 and the valve body 1, the fit between the annular flange 21 and the limiting step 311 of the clamping sleeve 31, the scale lines of the positioning ring 32, the spherical sealing surface of the valve seat body 2 and the conical sealing ring of the valve body 1, and the elastic sealing ring on the annular flange 21, during installation, the valve seat body 2 is tightly connected to the valve body 1 through the interference fit, and the fit between the annular flange 21 and the limiting step 311 restricts axial displacement; the scale lines of the positioning ring 32 ensure that the height difference between the top of the valve seat body 2 and the sealing surface of the valve body 1 is accurately controllable; the spherical sealing surface and the conical sealing ring form a line contact seal, which, together with the fit between the elastic sealing ring and the end face of the valve body 1, forms a multi-seal structure; this solves the problem of leakage rate fluctuation caused by inaccurate height difference control in traditional tooling, and the multi-seal structure... The sealing design can withstand long-term erosion by gases and corrosive media, significantly improving sealing stability. The valve seat removal tool 4 features an expansion head 41 and anti-slip teeth, and the valve seat body 2 is separable from the valve body 1. When the valve seat body 2 needs replacement due to wear or corrosion, the tapered expansion head 41 is driven by a pull rod to insert into the inner cavity of the valve seat body 2. The anti-slip teeth enhance friction, opening the inner wall of the valve seat body 2 to overcome interference fit resistance, allowing the valve seat body 2 to be removed separately from the valve body 1. After replacing the new valve seat body 2, the installation process can be repeated, avoiding the problem in existing technologies where the entire valve body 1 needs to be scrapped after the valve seat is damaged. Only the valve seat body 2 needs to be replaced to restore valve function, significantly reducing maintenance costs. This is especially suitable for the long-term use of high-value valve bodies 1 in the semiconductor and photovoltaic industries.

[0029] The implementation principle of this application embodiment is as follows: In the valve seat installation process, the valve seat body 2 is placed into the valve seat mounting hole of the valve body 1, so that the positioning protrusion at the bottom of the valve seat body 2 is embedded into the deep positioning groove of the valve body 1, achieving preliminary radial positioning. The clamping sleeve 31 of the valve seat closing tool 3 is fitted onto the outside of the valve seat body 2, so that the limiting step 311 on the inner wall of the clamping sleeve 31 abuts against the annular flange 21 at the top of the valve seat body 2. Simultaneously, the positioning ring 32 is fitted onto the outside of the clamping sleeve 31. The positioning ring 32 slides along the axial slider on the outer periphery of the clamping sleeve 31, passing through the inner wall of the positioning ring 32... The guide groove cooperates with the slider to restrict the circumferential rotation of the positioning ring 32, ensuring that the outer circumferential scale line is aligned with the preset reference, and precisely controlling the height difference between the top of the valve seat body 2 and the sealing surface of the valve body 1; by applying axial pressure by external force, the valve body 1 is plastically deformed at the constriction point, and the valve seat body 2 and the valve body 1 are clamped and fixed by the interference fit and tight fit relationship; at the same time, the spherical sealing surface of the valve seat body 2 and the conical sealing ring of the valve body 1 form a line contact seal, and the elastic sealing ring in the annular groove 211 on the annular flange 21 fits against the end face of the valve body 1 port, forming a double seal.

[0030] The valve seat replacement process involves disassembling the valve actuator and inserting the conical expansion head 41 of the valve seat removal tool 4 into the hollow inner cavity of the valve seat body 2. The expansion head 41 is then axially moved using a pull rod, utilizing its conical structure to open the inner wall of the valve seat body 2. The anti-slip teeth on the surface of the expansion head 41 enhance friction and prevent slippage. Continuous force is applied to overcome the interference fit resistance between the valve seat body 2 and the valve body 1, allowing it to be removed from the mounting hole. After replacing the valve seat body 2 with a new one, the above installation process is repeated to complete the replacement.

Claims

1. A tooling for a replaceable valve seat, comprising a valve body (1), a valve seat body (2), a valve seat closing tooling (3), and a valve seat removal tooling (4), characterized in that: The outer periphery of the valve seat body (2) forms an interference fit with the inner wall of the valve seat mounting hole of the valve body (1), and the top of the valve seat body (2) is provided with an annular flange (21); the valve seat closing tool (3) includes a clamping sleeve (31) and a positioning ring (32), the inner wall of the clamping sleeve (31) is provided with a limiting step (311) that matches the annular flange (21), and the positioning ring (32) is fitted on the outer side of the clamping sleeve (31) and can slide along the axial direction; the valve seat removal tool (4) includes a pull rod and an expansion head (41), the expansion head (41) is conical and can be moved axially by the pull rod to open the inner wall of the valve seat body (2).

2. The tooling for a replaceable valve seat according to claim 1, characterized in that: The valve body (1) has a deep positioning groove at the bottom of the valve seat mounting hole, and the valve seat body (2) has a positioning protrusion at the bottom that cooperates with the deep positioning groove.

3. The tooling for a replaceable valve seat according to claim 1, characterized in that: The positioning ring (32) of the valve seat closing tool (3) has scale lines on its outer periphery, which are used to precisely control the height difference between the top of the valve seat body (2) and the sealing surface of the valve body (1).

4. The tooling for a replaceable valve seat according to claim 1, characterized in that: The expansion head (41) of the valve seat removal tool (4) has anti-slip teeth on its surface.

5. The tooling for a replaceable valve seat according to claim 1, characterized in that: The valve seat body (2) is made of tungsten carbide coated stainless steel, with a surface roughness of ultra-high gloss, which can meet the low leakage requirements in precision sealing scenarios.

6. The tooling for a replaceable valve seat according to claim 1, characterized in that: The valve body (1) and the valve seat body (2) are tightly fitted, and the sealing surface of the valve seat body (2) is designed with a spherical surface, forming a line contact seal with the conical sealing ring of the valve body (1).

7. The tooling for a replaceable valve seat according to claim 3, characterized in that: The valve seat closing tool (3) has an axial slider on the outer periphery of the clamping sleeve (31), and the inner wall of the positioning ring (32) has a guide groove that cooperates with the slider. The guide groove can slide along the slider to restrict the circumferential rotation of the positioning ring (32).

8. The tooling for a replaceable valve seat according to claim 1, characterized in that: The valve seat body (2) has an annular flange (21) with an annular groove (211) embedded in the annular groove (211). After the valve seat body (2) is installed, the elastic sealing ring forms a sealing contact with the end face of the valve body (1).

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