A forming method for a fully lined fluorine self-acting micro-pressure regulating valve

Abstract

The present invention relates to the technical field of regulating valve production, and discloses a forming method for a fully fluorine-lined self-acting micro-pressure regulating valve, which includes the following steps: S1: Provide a metal valve body. The metal valve body is made of a high-pressure-resistant material and has a preset micro-pressure regulating structure. The fluoroplastic powder is evenly attached to the surface of the metal valve body by electrostatic spraying and melted layer by layer, effectively avoiding the generation of weak areas, significantly improving the sealing performance and corrosion resistance of the valve under micro-pressure regulation conditions, and thus enhancing the overall performance of the valve. During the forming process, the surface pretreatment process combines ultrasonic cleaning and chemical polishing, which not only effectively removes the fine particles and oil stains on the metal surface, but also improves the adhesion between the fluoroplastic and the metal surface. The good adhesion ensures the stability of the fluorine-lined layer during use and extends the service life of the valve.

Description

Technical Field

[0001] The present invention relates to the technical field of regulating valve production, and in particular to a forming method for a fully fluorine-lined self-acting micro-pressure regulating valve. Background Art

[0002] A fully fluorine-lined self-acting micro-pressure regulating valve is a regulating valve used in the industrial field, especially in working conditions with high requirements for medium corrosion resistance, such as chemical industry and pharmaceuticals. Through a self-acting structural design, this type of regulating valve can automatically adjust the micro-pressure in the system without an external power source to ensure the stability of fluid pressure. Due to its simple operation and the absence of an external control system, it has been widely used in the micro-pressure regulation and control of gases and liquids.

[0003] However, in the actual use process, the existing micro-pressure regulating valves have certain deficiencies in terms of corrosion resistance, sealing performance, and adjustment accuracy. Especially when dealing with highly corrosive media, the service life and stability of the valves often cannot meet the actual requirements. Therefore, a new forming method is needed to improve the overall performance and reliability of the valves. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the present invention provides a forming method for a fully fluorine-lined self-acting micro-pressure regulating valve, which solves the problems that the existing micro-pressure regulating valves have certain deficiencies in terms of corrosion resistance, sealing performance, and adjustment accuracy, especially when dealing with highly corrosive media, the service life and stability of the valves often cannot meet the actual requirements.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: A forming method for a fully fluorine-lined self-acting micro-pressure regulating valve, comprising the following steps:

[0006] S1: Provide a metal valve body, which is made of a high-pressure-resistant material and has a preset micro-pressure adjustment structure;

[0007] S2: Perform surface pretreatment on the metal valve body, including ultrasonic cleaning and chemical polishing of the inner cavity of the valve body to enhance the adhesion between the fluoroplastic and the metal surface;

[0008] S3: Preheat the metal valve body to a temperature range of 200 °C to 250 °C;

[0009] S4: Perform fluorine lining operation on the inner surface of the preheated metal valve body through a multi-layer progressive fluorine lining process, and the multi-layer progressive fluorine lining process includes electrostatic spraying of fluoroplastic powder and multiple meltings until the designed thickness is reached;

[0010] S5: Control the cooling process using pulse cooling technology to avoid the generation of internal stress in the fluoroplastic layer;

[0011] S6: Assemble the valve assembly, including key components such as the adjustment structure, sealing device, and micro-pressure adjustment device, to ensure coordination with the forming process of the fluorine-lined layer to form a complete micro-pressure regulating valve structure;

[0012] S7: Conduct performance tests on the formed regulating valve, including corrosion resistance, airtightness, and adjustment accuracy tests, to ensure stable operation under micro-pressure conditions.

[0013] Preferably, the multi-layer progressive fluorine-lining process uses electrostatic spraying to evenly attach fluoroplastic powder to the metal surface through electric field force to form a fluorine-lined layer.

[0014] Preferably, the material of the fluorine-lined layer is polytetrafluoroethylene, and its spraying thickness is controlled between 0.1 mm and 0.2 mm.

[0015] Preferably, the pulse cooling technology controls the flow rate and temperature of the cooling medium in sections to maintain a low internal stress during the cooling process.

[0016] Preferably, the cooling medium is a combination of gas cooling and liquid cooling, and the flow rate and temperature of the cooling medium are adjusted according to the material of the metal valve body.

[0017] Preferably, in the surface pretreatment step of the metal valve body, a combined process of ultrasonic cleaning and chemical polishing is used to remove fine particles and oil stains on the metal surface.

[0018] Preferably, the solvent used for chemical polishing is an acidic or alkaline solution.

[0019] Preferably, the preheating step is carried out by far-infrared heating or resistance heating to make the surface of the metal valve body reach the required temperature, so that the fluoroplastic powder can be evenly melted and attached on the metal surface.

[0020] Preferably, the melting operation during the fluorine-lining process is through layer-by-layer heating and cooling cycles, and partial cooling is carried out after each layer of fluoroplastic is melted to reduce stress accumulation between layers.

[0021] Preferably, after the fluorine-lining operation is completed, the entire valve surface is subjected to corrosion resistance tests and high-temperature tests.

[0022] Beneficial effects

[0023] The present invention provides a forming method for a fully fluorine-lined self-acting micro-pressure regulating valve. Compared with the prior art, it has the following beneficial effects:

[0024] The present invention provides a forming method for a fully fluorine-lined self-acting micro-pressure regulating valve. By means of electrostatic spraying, fluoroplastic powder is evenly adhered to the surface of the metal valve body and melted layer by layer, effectively avoiding the generation of weak areas, significantly improving the sealing performance and corrosion resistance of the valve under micro-pressure regulation conditions, and thus enhancing the overall performance of the valve. During the forming process, the surface pretreatment process combines ultrasonic cleaning and chemical polishing, which not only effectively removes the fine particles and oil stains on the metal surface but also improves the adhesion between the fluoroplastic and the metal surface. The good adhesion ensures the stability of the fluorine-lined layer during use and extends the service life of the valve. In addition, after this pretreatment step, the corrosion resistance of the valve against various corrosive media is further improved. During the cooling process, the present invention adopts pulse cooling technology to effectively control the flow rate and temperature of the cooling medium, thereby avoiding the problems of cracking or peeling of the fluorine-lined layer caused by excessive temperature difference. This technological innovation not only improves the integrity and consistency of the fluorine-lined layer but also reduces the failure risk caused by the accumulation of internal stress, laying a solid foundation for the long-term stable operation of the valve. In the performance test after forming, the present invention covers a comprehensive evaluation of corrosion resistance, airtightness, and adjustment accuracy. Through a strict test process, it ensures the stable operation of the valve under micro-pressure conditions and meets the requirements of different application fields, especially in the micro-pressure regulation of highly corrosive media such as in the chemical and pharmaceutical industries. Finally, the optimization of the overall process significantly improves the working stability and reliability of the valve. The preheating step using far-infrared or resistance heating ensures the uniform melting of the fluoroplastic powder, thereby effectively improving the overall performance of the valve. This series of process improvements not only achieve a major breakthrough in technology for the forming method of the fully fluorine-lined self-acting micro-pressure regulating valve but also provide a more efficient and safe micro-pressure regulation solution for related industries. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG. 1 is a schematic flow chart of the steps of a forming method for a fully fluorine-lined self-acting micro-pressure regulating valve proposed by the present invention;

[0026] FIG. 2 is a schematic flow chart of fluorine lining of a forming method for a fully fluorine-lined self-acting micro-pressure regulating valve proposed by the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] Please refer to FIGS. 1-2. The present invention provides a technical solution, which specifically includes the following embodiments:

[0029] Embodiment:

[0030] A forming method for a fully lined fluorine self-acting micro-pressure regulating valve includes the following steps:

[0031] S1: Provide a metal valve body. The metal valve body is made of high-pressure-resistant materials and has a preset micro-pressure regulating structure. The metal valve body is the basic component of the regulating valve, and its main function is to withstand the pressure during operation and maintain the stability of fluid passage. The metal valve body needs to be made of high-pressure-resistant materials, such as metal materials like stainless steel and carbon steel, which have high mechanical strength and corrosion resistance. When designing the metal valve body, it is necessary to ensure that the preset micro-pressure regulating structure meets the usage requirements, such as the shape of the valve chamber, the layout of the channels, and the accuracy of the sealing surface, so that the subsequent regulating function can operate normally;

[0032] S2: Perform surface pretreatment on the metal valve body, including ultrasonic cleaning and chemical polishing of the inner cavity of the valve body to enhance the adhesion between the fluoroplastic and the metal surface. In order to enhance the adhesion between the fluoroplastic and the metal valve body, strict surface pretreatment of the inner cavity of the valve body must be carried out. First, use ultrasonic cleaning technology to remove impurities, oil stains, and fine particles attached to the metal surface to ensure the surface is clean. Ultrasonic cleaning uses the action of high-frequency sound waves in the liquid to cause strong cavitation effects in the liquid, peeling off the contaminants attached to the surface. Subsequently, perform chemical polishing, using acidic or alkaline solutions to further clean and smooth the metal surface. This step improves the adhesion force of the contact surface between the fluoroplastic and the metal, ensuring that the subsequent fluorine-lined layer is more stable and durable;

[0033] S3: Preheat the metal valve body to a temperature range of 200 °C to 250 °C. Before performing the fluorine-lining operation, the metal valve body must be preheated to a temperature range of 200 °C to 250 °C. The purpose of this step is to make the metal valve body reach a temperature matching that of the melting of the fluoroplastic powder, so as to ensure that the fluoroplastic powder can be evenly melted and adhered to the metal surface. The preheating can be carried out by far-infrared heating or resistance heating methods. It is necessary to strictly control the temperature to avoid too high or too low temperature, which will affect the subsequent fluorine-lining effect;

[0034] S4: Perform fluorine lining operation on the inner surface of the preheated metal valve body through a multi-layer progressive fluorine lining process. The multi-layer progressive fluorine lining process includes electrostatic spraying of fluoroplastic powder and multiple fusions until the thickness reaches the design requirement. On the inner surface of the preheated metal valve body, perform fluorine lining operation using the multi-layer progressive fluorine lining process. This process evenly attaches the fluoroplastic powder to the metal surface through electrostatic spraying, and uses the electric field force to make the fluoroplastic powder adsorb to the preheated metal surface. After each layer of fluoroplastic powder is fused, multiple repeated operations are required until the fluorine lining layer reaches the design requirement thickness. Compared with one-time spraying, the multi-layer spraying process can effectively avoid the appearance of bubbles, voids or weak areas on the surface, ensure that the fluorine lining layer on the entire inner surface of the valve body is uniform and dense, and improve the corrosion resistance of the valve;

[0035] S5: Adopt pulse cooling technology to control the cooling process to avoid the generation of internal stress in the fluoroplastic layer. After the fluorine lining operation is completed, the metal valve body and the fluoroplastic lining need to be cooled. In order to avoid the generation of internal stress in the fluoroplastic layer during the cooling process, pulse cooling technology is adopted. This technology controls the flow rate and temperature of the cooling medium in sections, so that the metal valve body cools down gradually, avoiding the accumulation of internal stress and the cracking of the fluorine lining layer caused by too rapid temperature change. The cooling medium can be gas or liquid, and the cooling method is adjusted according to the material of the metal valve body and the working environment to ensure uniform and stable cooling;

[0036] S6: Assemble the valve components, including key components such as the adjustment structure, sealing device and micro-pressure adjustment device, to ensure that they match the forming process of the fluorine lining layer to form a complete micro-pressure regulating valve structure. After cooling, assemble all the valve components. Including seals, micro-pressure adjustment devices, etc. After assembly, perform performance tests on the regulating valve, including corrosion resistance tests, airtightness tests, high-temperature performance tests, etc., to ensure that the valve can work normally in the designed working environment and can maintain a stable regulating function under corrosive media, micro-pressure environment and high-temperature conditions;

[0037] S7: Perform performance tests on the formed regulating valve, including corrosion resistance, airtightness and adjustment accuracy tests, to ensure stable operation under micro-pressure conditions;

[0038] The multi-layer progressive fluorine lining process uses electrostatic spraying method to evenly attach the fluoroplastic powder to the metal surface through the electric field force to form a fluorine lining layer; Electrostatic spraying is an advanced spraying technology that evenly adsorbs the charged fluoroplastic powder on the surface of the metal valve body through the electric field force. The electrostatic spraying process can make the fluoroplastic powder form a uniform coating on the metal surface and can cover the inner cavity and surface of complex shapes. Under the action of the electric field force, the powder material can adhere more closely to the metal surface, avoiding the powder accumulation or unevenness in the traditional spraying method.

[0039] The material of the fluorine lining layer is polytetrafluoroethylene, and its spraying thickness is controlled between 0.1 mm and 0.2 mm; polytetrafluoroethylene has excellent corrosion resistance and high-temperature resistance, and is commonly used in occasions such as chemical industry and pharmaceuticals that require corrosion protection. The thickness of the fluorine lining layer is crucial. Controlling it within the range of 0.1 mm to 0.2 mm can ensure that the fluoroplastics have sufficient protection, and at the same time will not affect the micro-pressure regulation function of the metal valve body. Too thick or too thin a coating may cause performance problems. Therefore, strict thickness control is the key to ensuring product quality.

[0040] The pulse cooling technology controls the flow rate and temperature of the cooling medium in stages, maintaining a relatively low internal stress during the cooling process; the temperature change during the cooling process directly affects the internal stress accumulation of the fluorine lining layer. The pulse cooling technology controls the temperature and flow rate of the cooling medium in stages, making the temperature difference change between the metal valve body and the fluorine lining layer stable. This can prevent stress concentration and cracking of the fluoroplastic layer caused by rapid cooling. The staged control of cooling can also reduce the tension between materials with different thermal expansion coefficients, making the entire fluorine lining layer more stable.

[0041] The cooling medium is a combination of gas cooling and liquid cooling. The flow rate and temperature of the cooling medium are adjusted according to the material of the metal valve body; according to the material characteristics of the metal valve body, a suitable cooling medium is selected to cool it down. Gas cooling can quickly remove heat and is suitable for mild cooling; liquid cooling is suitable for a more precise and uniform cooling process. Through the combination of the two, an ideal cooling effect can be achieved while maintaining the controllability of the cooling speed, preventing local stress or thermal deformation during the cooling process.

[0042] In the surface pretreatment step of the metal valve body, a combined process of ultrasonic cleaning and chemical polishing is used to remove the fine particles and oil stains on the metal surface; ultrasonic cleaning can efficiently remove the fine particles, oil stains and oxides attached to the metal surface through the cavitation effect generated by acoustic oscillation in the liquid. Chemical polishing further makes the metal surface smoother, providing a good foundation suitable for the adhesion of fluoroplastics. Through the combination of these two processes, the surface treatment effect of the metal valve body is better, and the bonding force between the fluoroplastics and the metal is stronger, avoiding the risk of coating peeling off.

[0043] The solvent used for chemical polishing is an acidic or alkaline solution; according to the characteristics of different metal materials, chemical polishing can be carried out using an acidic or alkaline solution. Acidic solutions are suitable for treating corrosion-resistant materials such as stainless steel, while alkaline solutions are suitable for aluminum or other non-ferrous metal materials. Through chemical polishing, the surface roughness of the metal is greatly reduced, achieving the effects of enhancing the adhesion of fluoroplastics and reducing micro-cracks.

[0044] The preheating step adopted uses far-infrared heating or resistance heating to bring the surface temperature of the metal valve body to the required temperature, so that the fluoroplastic powder can be evenly melted and adhered on the metal surface; the preheating is to make the surface temperature of the metal valve body reach the temperature range suitable for the melting of the fluoroplastic powder. Both far-infrared heating and resistance heating can evenly transfer heat to the metal surface, ensuring that the fluoroplastic powder can be evenly melted and adhered to the metal surface. Far-infrared heating has the characteristics of strong penetration and fast heating, and is suitable for larger metal structures, while resistance heating has better temperature control accuracy and is suitable for small valve bodies with complex shapes.

[0045] During the fluorine lining process, the melting operation is carried out through a cycle of layer-by-layer heating and cooling. After each layer of fluoroplastic is melted, partial cooling is performed to reduce the stress accumulation between layers; during the fluorine lining process, after each layer of fluoroplastic powder is melted, partial cooling will be carried out, and then the heating and melting of the next layer will be carried out. This cyclic process of layered melting and cooling can effectively reduce the stress accumulation between layers and prevent the cracking or separation of the fluorine lining layer caused by differences in thermal expansion coefficients or uneven cooling.

[0046] After the fluorine lining operation is completed, corrosion resistance testing and high-temperature testing are carried out on the entire valve surface; the last step is to conduct strict performance testing on the entire valve, especially corrosion resistance testing and high-temperature testing under harsh working conditions. These tests can simulate the actual use environment to ensure that the valve can maintain stable working performance for a long time in a corrosive medium or high-temperature environment. After passing the tests, the valve can be put into use.

[0047] During operation, the metal valve body is made of high-pressure resistant materials and undergoes pre-treatment of ultrasonic cleaning and chemical polishing to remove tiny particles and oil stains on the inner surface, thereby enhancing the adhesion between the fluoroplastics and the metal surface. The pre-treated metal valve body is heated to an appropriate temperature range of 200 °C to 250 °C to prepare for the subsequent fluorine lining process. During the fluorine lining process, a multi-layer progressive fluorine lining process is adopted. The fluoroplastic powder is evenly adhered to the inner surface of the metal valve body by electrostatic spraying. The electrostatic spraying method utilizes the action of the electric field force to enable the fluoroplastic powder to evenly cover the metal surface, avoiding the uneven thickness and the generation of weak areas of the fluorine lining layer. Through layer-by-layer heating and melting, each layer of fluoroplastics is partially cooled after melting, reducing the accumulation of internal stress between the layers, thereby enhancing the stability and durability of the fluorine lining layer. To further optimize the cooling process, the present invention adopts a pulse cooling technique. By segmentally controlling the flow rate and temperature of the cooling medium, it is ensured that no excessive temperature gradient occurs during the cooling of the fluoroplastics, avoiding the accumulation of internal stress or the cracking of the fluorine lining layer caused by rapid cooling. The cooling medium can be selected as a combination of gas cooling and liquid cooling according to the material of the metal valve body and is precisely adjusted, thereby effectively reducing the stress that may occur during the cooling process. After the fluorine lining process is completed, the entire valve undergoes corrosion resistance testing and high-temperature testing to ensure the performance stability and reliability under extreme working conditions. This forming method not only improves the corrosion resistance of the valve but also enhances the accuracy and stability of micro-pressure regulation, and is applicable to micro-pressure regulation scenarios of corrosive media such as in the chemical industry and pharmaceuticals.

[0048] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the application shall be included within the protection scope of the present application.

Claims

1. A forming method for a fully lined fluorine self-acting micro-pressure regulating valve, characterized in that: It includes the following steps: S1: Provide a metal valve body, which is made of high-pressure resistant material and has a preset micro-pressure regulating structure; S2: Conduct surface pretreatment on the metal valve body, including ultrasonic cleaning and chemical polishing of the inner cavity of the valve body to enhance the adhesion between the fluoroplastics and the metal surface; S3: Preheat the metal valve body to a temperature range of 200°C to 250°C; S4: Conduct fluorine lining operation on the inner surface of the preheated metal valve body through a multi-layer progressive fluorine lining process, and the multi-layer progressive fluorine lining process includes electrostatic spraying of fluoroplastic powder and multiple fusions until the thickness reaches the design requirements; S5: Adopt pulse cooling technology to control the cooling process to avoid the generation of internal stress in the fluoroplastic layer; S6: Assemble the valve components, including the regulating structure, the sealing device and the micro-pressure regulating device, and ensure that they cooperate with the forming process of the fluorine lining layer to form a complete micro-pressure regulating valve structure; S7: Conduct performance tests on the formed regulating valve, including corrosion resistance, airtightness and regulation accuracy tests to ensure stable operation under micro-pressure conditions.

2. A forming method of a fully fluorine-lined self-acting micro-pressure regulating valve according to claim 1, characterized in that: The multi-layer progressive fluorine lining process adopts the electrostatic spraying method, and the fluoroplastic powder is evenly attached to the metal surface through the electric field force to form a fluorine lining layer; The material of the fluorine lining layer is polytetrafluoroethylene, and its spraying thickness is controlled between 0.1mm and 0.2mm.

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