Reactor outlet high pressure differential control valve

Abstract

The utility model provides a reactor export high pressure difference governing valve relates to governing valve technical field, including valve cover, valve seat and valve rod, be equipped with installation cavity in the valve cover, the inside installation of installation cavity has the casing and two sealing structures, and is fixed through the compaction of gland, install support on the gland, the part of valve rod is located outside passes through gland and is connected with gland screw thread, two sealing structures are located two ends of casing respectively, and are as upper sealing piece and lower sealing piece of valve rod, valve rod passes through casing inner chamber and extends to valve seat, adopts WC hard alloy through adopting valve seat, adopts dual phase steel material to valve rod, and carries out three section processing, solved the governing valve that is used for the present chemical industry related reactor export, because the pressure difference of valve inlet and outlet is bigger, and the medium temperature of reactor is high and the flow rate is fast, the problem that the valve rod and valve seat sealing surface are washed seriously, has promoted the use effect and the service life of reactor export high pressure difference governing valve.

Description

Technical Field

[0001] This utility model relates to the field of regulating valve technology, specifically to a high pressure differential regulating valve at the reactor outlet. Background Technology

[0002] Control valves are devices used to control parameters such as fluid flow and pressure, and are widely used in fields such as chemical engineering.

[0003] However, control valves used at the outlet of chemical reactors suffer from short service life due to the large pressure difference between the valve inlet and outlet, the high temperature and high flow rate of the reactor medium, which severely erodes the sealing surfaces of the valve stem and seat. Utility Model Content

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this utility model provides a high pressure differential regulating valve for reactor outlets, which solves the problem of severe erosion of the valve stem and valve seat sealing surfaces caused by the large pressure differential between the valve inlet and outlet, as well as the high temperature and high flow rate of the reactor medium.

[0005] (II) Technical Solution To achieve the above objectives, this utility model provides the following technical solution: In this utility model, the reactor outlet high pressure differential regulating valve includes a valve cover, a valve seat, and a valve stem; The valve cover has an installation cavity; The mounting cavity is equipped with a sleeve and two sealing structures, which are then pressed and fixed by a pressure cap. A bracket is installed on the gland, and the outer portion of the valve stem passes through the gland and is threadedly connected to the gland. The two sealing structures are located at both ends of the sleeve, and serve as the upper and lower sealing elements of the valve stem; The valve stem passes through the inner cavity of the sleeve and extends into the valve seat, and is used to open and close the flow inlet and flow outlet on the valve seat; The valve seat is made of WC hard alloy material; The valve stem is made of duplex steel and includes an actuator, a sealing part, and the valve interior. Among them, the surface of the transmission part is carburized, the surface of the sealing part is chrome-plated, and the inner surface of the valve is sprayed with tungsten carbide.

[0006] Furthermore, an oil injection valve is installed on the valve cover; The oil injection valve is connected to the mounting cavity through a flow groove; The sleeve has a through hole that communicates with the flow groove; A gap is formed between the outer wall of the valve stem and the inner wall of the sleeve.

[0007] Furthermore, the flow channel includes flow section one, flow section two, and flow section three; The second flow section is used to connect the first flow section and the third flow section; Among them, flow section two and flow section one form a three-way pipe, and flow section two and flow section three form a three-way pipe; Both the opening end of the second flow section and the opening end of the third flow section are provided with plugs.

[0008] Furthermore, the valve seat and valve cover are detachably and fixedly connected.

[0009] Furthermore, each of the sealing structures includes packing and two gaskets, with the two gaskets located at both ends of the packing, respectively; The filler is a flexible graphite ring.

[0010] Furthermore, a handwheel is installed at the end of the valve stem away from the valve cover.

[0011] (III) Beneficial Effects This invention provides a reactor outlet high pressure differential regulating valve. Compared with the prior art, it has the following advantages: By using WC hard alloy for the valve seat and duplex steel for the valve stem, and performing three-stage treatments—carburizing the transmission part to improve surface hardness, chrome plating the sealing part to enhance corrosion resistance, and spraying tungsten carbide inside the valve to resist erosion—this solves the problem of severe erosion of the valve stem and seat sealing surfaces caused by the large pressure difference between the valve inlet and outlet, and the high temperature and high flow rate of the reactor medium, which is currently used in regulating valves at the outlet of chemical reactors. This improves the performance and service life of the high pressure differential regulating valve at the reactor outlet. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of a reactor outlet high pressure differential regulating valve; Figure 2 This is a schematic diagram of the oil injection channel structure of a reactor outlet high pressure differential regulating valve.

[0014] Figure label: 1. Valve cover; 10. Mounting cavity; 11. Flow groove; 111. Flow section one; 112. Flow section two; 113. Flow section three; 12. Plug; 2. Valve seat; 20. Flow inlet; 21. Flow outlet; 3. Gland; 4. Sleeve; 40. Through hole; 41. Clearance; 5. Oil injection valve; 6. Sealing structure; 7. Bracket; 8. Valve stem; 80. Actuation and transmission part; 81. Sealing part; 82. Valve interior; 9. Handwheel. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model are described clearly and completely. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0016] This application provides a reactor outlet high pressure differential regulating valve, which solves the problem of severe erosion of the valve stem and seat sealing surfaces caused by the large pressure difference between the valve inlet and outlet, the high temperature and high flow rate of the reactor medium, and the current regulating valves used at the outlet of chemical reactors. This improves the performance and service life of the reactor outlet high pressure differential regulating valve.

[0017] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0018] like Figure 1 As shown, a reactor outlet high pressure differential regulating valve includes a valve cover 1, a valve seat 2, and a valve stem 8; The valve cover 1 is provided with a mounting cavity 10; The mounting cavity 10 is equipped with a sleeve 4 and two sealing structures 6, which are then pressed and fixed by a pressure cap 3. A bracket 7 is installed on the pressure cover 3, and the outer portion of the valve stem 8 passes through the pressure cover 3 and is threadedly connected to the pressure cover 3. The two sealing structures 6 are located at both ends of the sleeve 4, and serve as the upper and lower sealing elements of the valve stem 8; The valve stem 8 passes through the inner cavity of the sleeve 4 and extends into the valve seat 2, and is used to open and close the flow inlet 20 and flow outlet 21 on the valve seat 2; The valve seat 2 is made of WC hard alloy material; The valve stem 8 is made of 2205 duplex steel and includes an actuator 80, a sealing part 81 and a valve interior 82. Among them, the surface of the transmission part 80 is carburized, the surface of the sealing part 81 is chrome-plated, and the surface of the valve interior 82 is sprayed with tungsten carbide.

[0019] It should be noted that when valve stem 8 closes flow inlet 20 and flow outlet 21: The actuator 80 is located outside the valve cover 1, the sealing part 81 is located inside the valve cover 1 and between the two sealing structures 6, and the valve interior 82 is partly located inside the valve cover 1 and partly located inside the valve seat 2.

[0020] By using WC hard alloy (temperature resistance ≥300℃, hardness HRA90+) for valve seat 2 and 2205 duplex steel (high temperature resistance, corrosion resistance) for valve stem 8, the core problem of the original valve being "not resistant to erosion and easy to wear" under multi-component media at 260~270℃ is solved. Furthermore, the valve stem 8 is made of 2205 duplex steel and undergoes three-stage treatment: the first stage (actuator 80) is carburized to improve surface hardness, the second stage (sealing part 81) is chrome-plated to enhance corrosion resistance, and the third stage (valve interior 82) is sprayed with tungsten carbide to resist erosion. This solves the problem of severe erosion of the valve stem 8 and valve seat 2 sealing surfaces caused by the large pressure difference between the valve inlet and outlet, the high temperature of the reactor medium, and the fast flow rate. This improves the performance and service life of the high pressure differential control valve at the reactor outlet. It also solves the problem that the valve stem 8 and valve seat 2 are prone to deformation, peeling of the surface hardened layer or fatigue cracks under the combined action of thermal stress and mechanical stress, which aggravates sealing failure and component damage.

[0021] In practical applications, the valve seat 2 and the valve cover 1 are detachably and fixedly connected, for example, by means of bolts, and the valve stem 8 part at the connection between the valve seat 2 and the valve cover 1 is sealed by a sealing gasket, and the connection between the valve cover 1 and the valve seat 2 is sealed by a metal spiral wound gasket (316 + flexible graphite). After the gland 3 is embedded into the mounting cavity 10 and compacted against the sealing structure 6, the gland 3 and the valve cover 1 are fixed by bolts and nuts.

[0022] like Figure 1 As shown, each of the sealing structures 6 includes packing and two gaskets, with the two gaskets located at both ends of the packing, respectively. The filler is a flexible graphite ring.

[0023] Flexible graphite packing is suitable for high temperatures of 260~270℃, enhancing sealing reliability. It also uses flexible graphite packing and adds gaskets (material S31608) to strengthen the packing strength and fixation.

[0024] like Figure 1As shown, a handwheel 9 is installed at the end of the valve stem 8 away from the valve cover 1 to better control the rotation of the valve stem 8.

[0025] Specifically, the handwheel 9 is threaded or welded to the valve stem 8.

[0026] like Figures 1-2 As shown, an oil injection valve 5 is installed on the valve cover 1; The oil injection valve 5 is connected to the mounting cavity 10 through the flow groove 11; The sleeve 4 is provided with a through hole 40 that communicates with the flow groove 11; A gap 41 is formed between the outer wall of the valve stem 8 and the inner wall of the sleeve 4.

[0027] By setting up an oil injection valve 5 and injecting lubricating oil through the oil injection valve 5, the injected lubricating oil flows through the flow groove 11 and the through hole 40 into the gap 41, lubricating the outer wall of the valve stem 8 and the inner wall of the sleeve 4, facilitating the rotation of the valve stem 8, so as to realize the smooth opening and closing operation of the valve stem 8 on the flow inlet 20 and the flow outlet 21.

[0028] like Figure 2 As shown, the flow channel 11 includes a first flow section 111, a second flow section 112, and a third flow section 113; The second flow section 112 is used to connect the first flow section 111 and the third flow section 113; Among them, the second flow section 112 and the first flow section 111 form a three-way pipe, and the second flow section 112 and the third flow section 113 form a three-way pipe; Both the opening end of the second flow section 112 and the opening end of the third flow section 113 are provided with plugs 12.

[0029] Specifically, the plug 12 is detachably and fixedly connected to the valve cover 1, for example, by a threaded connection. A sealing gasket can be provided on the plug 12 to enhance the sealing between the plug 12 and the flow groove 11.

[0030] By setting the flow channel 11 into flow section one 111, flow section two 112 and flow section three 113, while satisfying the requirement that the oil injection valve 5 injects lubricating oil into the gap 41 for lubrication, the flow channel 11 forms two open ends that communicate with the outside, thereby facilitating the cleaning of the flow channel 11.

[0031] During operation, the rotation of handwheel 9 drives the valve stem 8, which is fixedly connected to handwheel 9, to rotate. Since valve stem 8 is threadedly connected to bracket 7, valve stem 8 opens or blocks the flow channel groove formed by the flow inlet 20 and flow outlet 21 in valve seat 2 during rotation, thereby achieving flow regulation and flow. When it is necessary to lubricate the inner wall of the sleeve 4 and the valve stem 8 inside the sleeve 4, simply inject lubricating oil into the flow groove 11 through the oil injection valve 5, and then enter the gap 41 through the flow groove 11 and the through hole 40 to achieve lubrication of the inner wall of the sleeve 4 and the valve stem 8 inside the sleeve 4. When it is necessary to clean the flow channel 11, simply remove the plug 12 and inject clean water through the oil injection valve 5 to complete the cleaning of the flow channel 11.

[0032] Example: The valve has been put into trial use in sections 902 and 906 of a company's refining workshop. The invention precisely solves the long-standing pain point of "high failure rate and short service life" of existing valves. Previously, due to insufficient adaptability and durability, the valve could only operate stably for about 4 months on average before failing to work properly due to component damage. Frequent replacement and maintenance brought considerable economic pressure and maintenance burden to the production of the section. Since the valve of this application was put into use, continuous monitoring has shown that all its operating indicators have remained normal, and it has performed well in terms of media compatibility and structural stability, effectively reducing the frequency of equipment failures. From an economic perspective, the valve in this application not only reduces costs and increases efficiency, but also ensures the continuity of the workshop's production process, providing reliable equipment support for the stable operation of the refining workshop.

[0033] In summary, compared with existing technologies, it has the following beneficial effects: 1. By using WC hard alloy (temperature resistance ≥300℃, hardness HRA90+) for valve seat 2 and 2205 duplex steel (high temperature resistance, corrosion resistance) for valve stem 8, the core problem of the original valve being "not resistant to erosion and easy to wear" under multi-component media at 260~270℃ is solved. Furthermore, the valve stem 8 is made of 2205 duplex steel and undergoes three-stage treatment: the first stage (actuator 80) is carburized to improve surface hardness; the second stage (sealing part 81) is chrome-plated to enhance corrosion resistance; and the third stage (valve interior 82) is sprayed with tungsten carbide to resist erosion. This solves the problem of severe erosion of the valve stem 8 and valve seat 2 sealing surfaces caused by the large pressure difference between the valve inlet and outlet, the high temperature of the reactor medium, and the fast flow rate. This improves the performance and service life of the high pressure differential control valve at the reactor outlet.

[0034] 2. By setting the sealing structure 6 in the form of packing and two gaskets, the sealing structure 6 limits the packing through the two gaskets, ensuring the sealing stability and sealing effect of the packing.

[0035] 3. By setting up an oil injection valve 5 and injecting lubricating oil through the oil injection valve 5, the injected lubricating oil flows through the flow groove 11 and the through hole 40 into the gap 41, lubricating the outer wall of the valve stem 8 and the inner wall of the sleeve 4, facilitating the rotation of the valve stem 8, so as to realize the smooth opening and closing operation of the valve stem 8 on the flow inlet 20 and the flow outlet 21.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0037] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A reactor outlet high pressure differential regulating valve, characterized in that, Includes valve cover (1), valve seat (2) and valve stem (8); The valve cover (1) is provided with an installation cavity (10); The mounting cavity (10) is equipped with a sleeve (4) and two sealing structures (6), which are then pressed and fixed by a pressure cap (3); A bracket (7) is installed on the pressure cap (3), and the outer part of the valve stem (8) passes through the pressure cap (3) and is threadedly connected to the pressure cap (3); Two sealing structures (6) are located at both ends of the sleeve (4) and serve as the upper and lower seals of the valve stem (8); The valve stem (8) passes through the inner cavity of the sleeve (4) and extends into the valve seat (2) for opening and closing the flow inlet (20) and flow outlet (21) on the valve seat (2); The valve seat (2) is made of WC hard alloy material; The valve stem (8) is made of (2205) duplex steel and includes an actuator (80), a sealing part (81) and a valve interior (82). Among them, the surface of the transmission part (80) is carburized, the surface of the sealing part (81) is chrome-plated, and the surface of the valve interior (82) is sprayed with tungsten carbide.

2. The reactor outlet high pressure differential regulating valve as described in claim 1, characterized in that, An oil injection valve (5) is installed on the valve cover (1); The oil injection valve (5) is connected to the mounting cavity (10) through the flow groove (11); The sleeve (4) has a through hole (40) that communicates with the flow groove (11). A gap (41) is formed between the outer wall of the valve stem (8) and the inner wall of the sleeve (4).

3. The reactor outlet high pressure differential regulating valve as described in claim 2, characterized in that, The flow channel (11) includes flow section one (111), flow section two (112) and flow section three (113). The second flow segment (112) is used to connect the first flow segment (111) and the third flow segment (113). Among them, the second flow section (112) and the first flow section (111) form a three-way pipe, and the second flow section (112) and the third flow section (113) form a three-way pipe; The opening ends of the second flow section (112) and the third flow section (113) are each provided with plugs (12).

4. The reactor outlet high pressure differential regulating valve as described in claim 1, characterized in that, The valve seat (2) and the valve cover (1) are detachably and fixedly connected.

5. The reactor outlet high pressure differential regulating valve as described in claim 1, characterized in that, Each of the sealing structures (6) includes packing and two gaskets, the two gaskets being located at both ends of the packing; The filler is a flexible graphite ring.

6. The reactor outlet high pressure differential regulating valve as described in claim 1, characterized in that, A handwheel (9) is installed at the end of the valve stem (8) away from the valve cover (1).

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