Jacket heat preservation flange type high-temperature and high-pressure two-way hard sealing ball valve

Abstract

A jacket heat preservation flange type high-temperature and high-pressure two-way hard sealing ball valve comprises a valve body, a valve cover, a valve rod, a ball body, a heat preservation jacket, a heat preservation fluid inlet flange and a heat preservation fluid outlet flange, and the heat preservation fluid inlet flange and the heat preservation fluid outlet flange are arranged on the heat preservation jacket. The inlet channel is provided with an inlet valve seat assembly used for being sealed with the ball body, the outlet channel is provided with an outlet valve seat assembly used for being sealed with the ball body, the inlet valve seat assembly comprises a floating valve seat, and the floating valve seat is sleeved with an elastic piece. The elastic piece is used for pushing the floating valve seat to be in sealed connection with the valve body and the ball body, and a T-shaped gap is formed between the elastic piece and the valve body; the outlet valve seat assembly comprises a fixed valve seat, and hard alloy is overlaid on two contact end faces C and D of the fixed valve seat and the valve cover and is ground to form 100% matching faces.

Description

Technical Field

[0001] The utility model relates to a jacket-insulated flange type high-temperature and high-pressure bi-directional hard-sealed ball valve, belonging to the field of valves. Background Art

[0002] Due to its wear resistance, scratch resistance and self-cleaning characteristics, the metal hard-sealed ball valve is particularly suitable for working conditions of high temperature, high temperature and media containing solid particles. However, for media such as sulfur recovery, slurry oil, liquid sulfur and heat transfer oil that are prone to crystallization, coking and condensation, once the body cavity of the valve body cannot be insulated and crystals or caking and coking are formed, even a hard-sealed ball valve cannot completely eliminate the influence of crystals and caking.

[0003] To solve this problem, in previous similar working conditions, such as soft-sealed ball valves, a steam insulation jacket layer was often added outside the shell. However, the general steam insulation is generally within 120~200°C, which is obviously insufficient for high-temperature media such as slurry oil and liquid sulfur. It is not conducive to the sealing and long-term use of the valve. Content of the Utility Model

[0004] The purpose of the utility model is to overcome the disadvantages and deficiencies existing in the prior art, and to provide a jacket-insulated flange type high-temperature and high-pressure bi-directional hard-sealed ball valve.

[0005] A jacketed insulation flange type high-temperature and high-pressure bi-directional hard-sealed ball valve, comprising a valve body, a valve cover, a valve stem, a ball, a thermal insulation jacket, a thermal insulation fluid inlet flange and a thermal insulation fluid outlet flange arranged on the thermal insulation jacket. An inlet channel and an outlet channel are arranged in the valve body. An inlet valve seat assembly for sealing with the ball is arranged in the inlet channel, and an outlet valve seat assembly for sealing with the ball is arranged in the outlet channel. The inlet valve seat assembly includes a floating valve seat, and an elastic member is sleeved on the floating valve seat. The elastic member is used to push the floating valve seat to be hermetically connected with the valve body and the ball, and a T-shaped gap is arranged between the elastic member and the valve body. The outlet valve seat assembly includes a fixed valve seat, and hard alloy is surfacing-welded on the two contact end faces C and D of the fixed valve seat and the valve cover and ground to form a 100% matching surface. The thermal insulation fluid inlet flange and the thermal insulation fluid outlet flange are respectively connected with external high-temperature thermal insulation medium pipelines, so as to keep the medium in the valve body in a flowing state all the time. In the utility model, a thermal insulation jacket is arranged outside the valve body and the valve cover, and is connected with external high-temperature thermal insulation medium pipelines (such as a heat-conducting oil system) through the thermal insulation fluid inlet flange and the outlet flange, so that a high-temperature thermal insulation medium forms a continuous circulation in the jacket, ensuring that the valve body cavity is always in a constant high-temperature state, thereby effectively avoiding the problems of condensation, deposition and blockage of easily crystallized and coking media such as liquid sulfur and slurry in the valve cavity, and ensuring the normal opening and closing of the valve and the reliability of long-term operation. Compared with the traditional steam jacket (the temperature is only 120-200 °C), the utility model can achieve a thermal insulation effect above 350 °C, meeting the use requirements under harsh high-temperature and high-pressure working conditions. The inlet end adopts a floating valve seat structure, and an elastic member is arranged to push the valve seat to seal with the ball. A T-shaped gap is arranged between the elastic element and the valve body, so that the valve seat can be micro-moved to fit the ball, and good sealing performance can be maintained under the condition of bi-directional flow, enhancing the bi-directional sealing ability and anti-scouring performance of the ball valve. The outlet valve seat adopts a fixed structure, and hard alloy is surfacing-welded on the two end faces (C and D) in contact with the valve cover and then precisely ground to form a 100% matching surface, further improving the sealing reliability and wear resistance, and being applicable to high-temperature and high-pressure solid particle-containing media.

[0006] Preferably, mating surfaces A and B in the shape of 30° conical surfaces are respectively arranged on the floating valve seat and the valve body for forming a matching seal connection, and hard alloy is surfacing-welded on the mating surfaces A and B. The sealing surface forms a 30° angle with the center line, so as to ensure that a smaller valve seat thrust can ensure a matching seal with the valve body mating surface. At the same time, since the leaf spring not only pushes the floating valve seat towards the ball to make the floating valve seat at the inlet end always fit with the ball, on the other hand, the elastic member also applies pressure to the sealing ring through the pressing plate to promote the sealing at the back of the valve seat. In addition, hard alloy is surfacing-welded on the 30° conical surfaces of the valve seat and the valve body to further promote the long-term stable and reliable seal. The elastic member can be selected from a spring, a leaf spring or a disc spring.

[0007] Furthermore, a sealing ring and a pressing plate are sleeved outside the floating valve seat. The pressing plate is used to abut against the elastic member to form a limit. A first step is provided on the floating valve seat, and an anti-sand ring for forming a sealed connection with the valve body is provided on the first step. One end of the pressing plate abuts against the elastic member, playing a limiting role to prevent the axial displacement of the elastic member from affecting the pre-tightening force of the valve seat. The anti-sand ring is used to block solid particles from entering the sealing mating surface between the valve seat and the valve body, preventing particle jamming, scratching the sealing surface or causing leakage, thereby effectively improving the operation reliability and sealing life of the valve under the working conditions of solid particle-containing media (such as slurry, residue oil, etc.).

[0008] Preferably, a limiting groove is provided on the fixed valve seat. The fixed valve seat is fixedly connected to the valve cover bolt through a limiting plate, and the limiting plate is reinforced by spot welding after being fixedly connected to the bolt. This structure realizes the precise positioning and axial limitation of the fixed valve seat under high-temperature and high-pressure working conditions on the one hand, preventing the axial displacement or loosening of the valve seat caused by thermal expansion and contraction or medium erosion, and ensuring that its sealing end face and the sphere always maintain a high degree of coincidence; on the other hand, the spot welding reinforcement measure provides a secondary fixing means, enabling the valve seat to still maintain a stable structure and reliable sealing under long-term, strong impact or frequent opening and closing conditions, effectively improving the operation life and safety of the whole valve.

[0009] Preferably, the valve stem and the sphere are fixedly matched through a flat tenon and a flat hole. A gland fixedly connected to the valve body is sleeved outside the valve stem. Packing is provided inside the gland. The valve stem is provided with upper and lower positioning ring surfaces E and F at the contact with the valve body. The diameters of the two positioning ring surfaces are larger than the diameter of the packing cooperating with the valve stem. A gland is provided outside the valve stem, and sealing packing is filled inside the gland to prevent the medium from leaking; at the same time, the valve stem is provided with upper and lower positioning ring surfaces E and F at the contact with the valve body, and their diameters are larger than the diameter of the packing cooperating part, which can form a reliable axial limitation and radial guiding structure, enhancing the stability and concentricity of the valve stem during the opening and closing process, effectively reducing the problems of valve stem shaking or packing loosening caused by temperature changes or pressure loads, prolonging the packing seal life and preventing leakage.

[0010] Furthermore, a friction plate is provided at the end of the upper positioning ring surface E, and the friction plate is arranged between the gland and the upper positioning ring surface E. The friction plate is arranged between the large end face of the valve stem and the lower end face of the gland, so that the large end face of the valve stem will not directly contact and rub against the large end face of the gland.

[0011] Furthermore, a bracket is installed on the gland, and the bracket is used to connect with the actuator. Separating the valve stem sealing gland and the actuator mounting bracket not only facilitates installation and adjustment, but also effectively avoids the direct action of the actuator load on the gland and the packing seal area, thereby preventing the gland from deforming, the packing from loosening or the valve stem from jamming due to the installation stress at the driving end.

[0012] Preferably, a middle flange gasket for pressure test and inspection before welding is provided between the valve body and the valve cover. This ensures the effective detection of the sealing performance of the internal sealing pair and the passage before leaving the factory. After confirming the reliability of the structure and sealing, welding is carried out, greatly improving the first-pass rate of overall assembly, sealing reliability and the standardization degree of manufacturing process.

[0013] Preferably, the heat preservation jacket is fixedly connected to the outside of the valve body and the valve cover. A flow channel for the flow of heat preservation medium is arranged in the heat preservation jacket, and an excretion plug is connected to the flow channel. The flow channel is used for the circulating flow of heat-conducting oil or other heat preservation media to ensure that the valve body always maintains a high temperature state, effectively preventing the valve cavity from being blocked by easily crystallized and coagulated media. The excretion plug is used to quickly empty the residual heat preservation medium inside the jacket during maintenance or medium replacement, preventing the accumulation of thermal stress and material deposition, and improving the safety and maintainability of system operation.

[0014] Further, the heat preservation medium is heat-conducting oil or other media with a working temperature above 350 °C.

[0015] The beneficial effects of the present utility model are as follows: The present utility model sets a heat preservation jacket outside the valve body and the valve cover, and connects it to the external high-temperature heat preservation medium pipeline (such as a heat-conducting oil system) through the heat preservation fluid inlet flange and the outlet flange, so that the high-temperature heat preservation medium forms a continuous cycle in the jacket, ensuring that the valve body cavity is always in a constant high-temperature state, thus effectively avoiding the problems of condensation, deposition and blockage of easily crystallized and coking media such as liquid sulfur and slurry in the valve cavity, and ensuring the normal opening and closing of the valve and the reliability of long-term operation. Compared with the traditional steam jacket (with a temperature of only 120 - 200 °C), the present utility model can achieve a heat preservation effect above 350 °C, meeting the use requirements under harsh working conditions of high temperature and high pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, obtaining other drawings based on these drawings still belongs to the scope of the present utility model.

[0017] Figure 1 is a schematic structural diagram of the present utility model;

[0018] Figure 2 is a schematic structural diagram of the heat preservation jacket in the present utility model;

[0019] Figure 3 is Figure 1 a detailed enlarged view of the S position in

[0020] Figure 4 Yes Figure 1 is an enlarged view of the details at position Y in the figure;

[0021] In the figure, 1 is the valve body; 11 is the inlet passage; 12 is the outlet passage; 2 is the valve cover; 3 is the valve stem; 4 is the sphere; 5 is the thermal insulation jacket; 51 is the flow passage; 52 is the thermal insulation fluid inlet flange; 53 is the thermal insulation fluid outlet flange; 54 is the drain plug; 6 is the inlet valve seat assembly; 61 is the floating valve seat; 62 is the elastic member; 63 is the T-shaped gap; 64 is the sealing ring; 65 is the pressing plate; 66 is the first step; 67 is the anti-sand ring; 7 is the outlet valve seat assembly; 71 is the fixed valve seat; 72 is the limit groove; 73 is the limit plate; 8 is the gland; 81 is the packing; 82 is the friction plate; 83 is the bracket; 84 is the intermediate flange gasket. Specific embodiments

[0022] To make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0023] It should be noted that all the expressions using "first" and "second" in the embodiments of the present utility model are used to distinguish two entities or parameters with the same name but different ones. It can be seen that "first" and "second" are only for the convenience of expression and should not be construed as a limitation on the embodiments of the present utility model. This will not be elaborated one by one in the subsequent embodiments.

[0024] The directional and positional terms mentioned in the present utility model, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "top", "bottom", "side", etc., are only with reference to the directions or positions in the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding the present utility model, rather than a limitation on the protection scope of the present utility model.

[0025] Such as Figures 1-4As shown in the figure, this is an embodiment of a jacket-insulated flanged high-temperature and high-pressure bi-directional hard-sealed ball valve of the present utility model, which includes a valve body 1, a valve cover 2, a valve stem 3, a ball 4, a thermal insulation jacket 5, a thermal insulation fluid inlet flange 52 and a thermal insulation fluid outlet flange 53 provided on the thermal insulation jacket 5. An inlet passage 11 and an outlet passage 12 are provided in the valve body 1. An inlet valve seat assembly 6 for sealing with the ball 4 is provided in the inlet passage 11, and an outlet valve seat assembly 7 for sealing with the ball 4 is provided in the outlet passage 12. The inlet valve seat assembly 6 includes a floating valve seat 61, and an elastic member 62 is sleeved on the floating valve seat 61. The elastic member 62 is used to push the floating valve seat 61 to be hermetically connected with the valve body 1 and the ball 4, and a T-shaped gap 63 is provided between the elastic member 62 and the valve body 1. The outlet valve seat assembly 7 includes a fixed valve seat 71, and hard alloy is surfacing-welded on the two contact end faces C and D of the fixed valve seat 71 and ground to form a 100% matching surface. The thermal insulation fluid inlet flange 52 and the thermal insulation fluid outlet flange 53 are respectively connected to external high-temperature thermal insulation medium pipelines, so as to keep the medium in the valve body 1 in a flowing state all the time. In the present utility model, a thermal insulation jacket 5 is arranged outside the valve body 1 and the valve cover 2, and is connected to external high-temperature thermal insulation medium pipelines (such as a heat-conducting oil system) through the thermal insulation fluid inlet flange 52 and the outlet flange, so that the high-temperature thermal insulation medium forms a continuous cycle in the jacket, ensuring that the cavity of the valve body 1 is always in a constant high-temperature state, thereby effectively avoiding the problems of condensation, deposition and blockage of easily crystallized and coking media such as liquid sulfur and slurry in the valve cavity, and ensuring the normal opening and closing of the valve and the reliability of long-term operation. Compared with the traditional steam jacket (the temperature is only 120-200 °C), the present utility model can achieve a thermal insulation effect above 350 °C, meeting the use requirements under harsh high-temperature and high-pressure working conditions. The inlet end adopts a floating valve seat structure, and an elastic member 62 is provided to push the valve seat to seal with the ball 4. A T-shaped gap 63 is provided between the elastic element and the valve body 1, enabling the valve seat to fit the ball 4 with slight movement and maintaining good sealing performance under bi-directional flow conditions, enhancing the bi-directional sealing ability and erosion resistance of the ball valve. The outlet valve seat adopts a fixed structure, and hard alloy is surfacing-welded on the two end faces (C, D) in contact with the valve cover 2 and then precisely ground to form a 100% matching surface, further improving the sealing reliability and wear resistance, and being applicable to high-temperature and high-pressure solid-particle-containing media.

[0026] The floating valve seat 61 and the valve body 1 are respectively provided with mating surfaces A and B in the form of 30° conical surfaces for forming a conforming seal connection. The mating surfaces A and B are surfacing welded with hard alloy. The seal surface forms a 30° angle with the center line to ensure a conforming seal with the mating surface of the valve body 1 with a relatively small valve seat thrust. At the same time, since the leaf spring not only pushes the floating valve seat 61 towards the sphere 4 to make the floating valve seat 61 at the inlet end always fit with the sphere 4, on the other hand, the elastic member 62 also applies pressure to the sealing ring 64 through the pressing plate 65 to promote the seal on the back of the valve seat. In addition, the 30° conical surfaces of the valve seat and the valve body 1 are both surfacing welded with hard alloy to further promote the long-term stable and reliable seal. The elastic member 62 can be selected as a spring, a leaf spring or a disc spring.

[0027] A sealing ring 64 and a pressing plate 65 are sleeved outside the floating valve seat 61. The pressing plate 65 is used for abutting against the elastic member 62 to form a limit. A first step 66 is provided on the floating valve seat 61, and an anti-sand ring 67 for forming a seal connection with the valve body 1 is provided on the first step 66. One end of the pressing plate 65 abuts against the elastic member 62 to play a limiting role and prevent the axial displacement of the elastic member 62 from affecting the valve seat pre-tightening force. The anti-sand ring 67 is used to block solid particles from entering the sealing mating surface between the valve seat and the valve body 1, prevent particle jamming, scratching of the sealing surface or causing leakage, so as to effectively improve the operation reliability and sealing life of the valve under the working conditions of media containing solid particles (such as slurry, residue oil, etc.).

[0028] A limit groove 72 is provided on the fixed valve seat 71. The fixed valve seat 71 is fixedly connected to the valve cover 2 by bolts through a limit plate 73, and the limit plate 73 is reinforced by spot welding after being fixedly connected to the bolts. This structure realizes the precise positioning and axial limit of the fixed valve seat 71 under high-temperature and high-pressure working conditions on the one hand, prevents the axial displacement or loosening of the valve seat caused by thermal expansion and contraction or medium erosion, and ensures that its sealing end face and the sphere 4 always maintain a high degree of conformity; on the other hand, the spot welding reinforcement measure provides a secondary fixing means, so that the valve seat can still maintain a stable structure and reliable seal under long-term, strong impact or frequent opening and closing conditions, effectively improving the operation life and safety of the whole valve.

[0029] In an embodiment of the present application, different from the above - mentioned embodiment, the valve stem 3 and the sphere 4 are fixedly matched through a flat tenon and a flat hole. A gland 8 fixedly connected to the valve body 1 is sleeved outside the valve stem 3. Packing 81 is provided inside the gland 8. The valve stem 3 is provided with upper and lower positioning ring surfaces E and F at the contact with the valve body 1. The diameters of the two positioning ring surfaces are larger than the diameter of the packing 81 cooperating with the valve stem 3. A gland 8 is provided outside the valve stem 3, and sealing packing 81 is filled inside the gland 8 to prevent the leakage of the medium. At the same time, the valve stem 3 is provided with upper and lower positioning ring surfaces E and F at the contact with the valve body 1, and their diameters are larger than the diameter of the part where the packing 81 cooperates, which can form a reliable axial limit and radial guiding structure, enhance the stability and concentricity of the valve stem 3 during the opening and closing process, effectively reduce the problems of the valve stem 3 shaking or the packing 81 loosening caused by temperature changes or pressure loads, extend the sealing life of the packing 81, and prevent leakage.

[0030] A friction plate 82 is provided at the end of the upper positioning ring surface E, and the friction plate 82 is arranged between the gland 8 and the upper positioning ring surface E. The friction plate 82 is arranged between the large end surface of the valve stem 3 and the lower end surface of the gland 8 so that the large end surface of the valve stem 3 does not directly contact and rub against the large end surface of the gland 8.

[0031] In an embodiment of the present application, different from the above - mentioned embodiment, a bracket 83 is installed on the gland 8, and the bracket 83 is used to connect with the actuator. Separating the gland 8 for sealing the valve stem 3 and the mounting bracket 83 of the actuator not only facilitates installation and adjustment, but also effectively avoids the direct action of the actuator load on the gland 8 and the sealing area of the packing 81, thereby preventing the deformation of the gland 8, the loosening of the packing 81 or the jamming of the valve stem 3 caused by the installation stress at the driving end.

[0032] A middle flange gasket 84 for pressure testing and inspection before welding is provided between the valve body 1 and the valve cover 2. It ensures that the sealing performance of the internal sealing pair and the channel can be effectively detected before leaving the factory, and welding is carried out after confirming the reliability of the structure and sealing, greatly improving the first - pass rate of the overall assembly, the sealing reliability and the standardization degree of the manufacturing process.

[0033] The heat - insulating jacket 5 is fixedly connected to the outside of the valve body 1 and the valve cover 2. A flow channel 51 for the flow of the heat - insulating medium is provided inside the heat - insulating jacket 5, and an excretion plug 54 is connected to the flow channel 51. The flow channel 51 is used for the circulating flow of heat - conducting oil or other heat - insulating media to ensure that the valve body 1 always maintains a high - temperature state, effectively preventing the crystallization - prone and solidification - prone media from blocking the valve cavity. The excretion plug 54 is used to quickly empty the residual heat - insulating medium inside the jacket during maintenance or when changing the medium, preventing the accumulation of thermal stress and the deposition of materials, and improving the safety and maintainability of the system operation.

[0034] The heat - insulating medium is heat - conducting oil or other media with a working temperature above 350 °C.

[0035] In an embodiment of the present application, different from the above embodiment, a feeding port and an exhaust port are respectively provided at both ends of the upper barrel. The feeding port is provided at the upper end, which can be directly connected to a hopper or a metering feeding device to achieve automated and continuous feeding, reducing the downtime and uneven fluctuations caused by manual feeding. The feeding rate is precisely controlled to ensure that the material has sufficient residence time in the melting section, realizing uniform melting and dispersion. The exhaust port is provided at the lower end, which can timely discharge moisture, solvent vapor and other volatiles during the extrusion process, preventing the generation of bubbles and pores in the material.

[0036] The above-disclosed are only the preferred embodiments of the present invention, and of course, they cannot be used to limit the scope of the rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

[0037] Although the present invention has been described with reference to several specific embodiments, it should be understood that the present invention is not limited to the specific embodiments disclosed. The present invention aims to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A jacket-insulated flanged high-temperature and high-pressure bi-directional hard-sealed ball valve, characterized in that: It includes a valve body, a valve cover, a valve stem, a sphere, a thermal insulation jacket, a thermal insulation fluid inlet flange and a thermal insulation fluid outlet flange provided on the thermal insulation jacket. An inlet passage and an outlet passage are provided in the valve body. The inlet passage is provided with an inlet valve seat assembly for sealing with the sphere, and the outlet passage is provided with an outlet valve seat assembly for sealing with the sphere. The inlet valve seat assembly includes a floating valve seat, and an elastic member is sleeved on the floating valve seat. The elastic member is used to push the floating valve seat to be hermetically connected with the valve body and the sphere, and a T-shaped gap is provided between the elastic member and the valve body. The outlet valve seat assembly includes a fixed valve seat. Both contact end faces C and D of the fixed valve seat and the valve cover are surfacing welded with hard alloy and ground to form a 100% matching surface. The thermal insulation fluid inlet flange and the thermal insulation fluid outlet flange are respectively connected to external high-temperature thermal insulation medium pipelines, so as to keep the medium in the valve body in a flowing state all the time.

2. The jacket-insulated flanged high-temperature and high-pressure bi-directional hard-sealed ball valve according to claim 1, characterized in that: The floating valve seat and the valve body are respectively provided with mating surfaces A and B in the shape of a 30° conical surface for forming a matching seal connection, and the mating surfaces A and B are surfacing welded with hard alloy.

3. The jacket-insulated flange-type high-temperature and high-pressure bi-directional hard-sealed ball valve according to claim 1, characterized in that: A sealing ring and a pressing plate are further sleeved outside the floating valve seat. The pressing plate is used to abut against the elastic member to form a limit. A first step is provided on the floating valve seat, and an anti-sand ring for forming a seal connection with the valve body is provided on the first step.

4. The jacket-insulated flange type high-temperature and high-pressure bi-directional hard-sealed ball valve according to claim 1, wherein: A limiting groove is provided on the fixed valve seat. The fixed valve seat is fixedly connected to the valve cover by a limiting plate and bolts. After the limiting plate is fixedly connected to the bolts, it is strengthened by spot welding.

5. The jacket-insulated flange-type high-temperature and high-pressure bi-directional hard-sealed ball valve according to claim 1, characterized in that: The valve stem and the sphere are fixedly matched through a flat tenon and a flat hole. A gland fixedly connected to the valve body is sleeved outside the valve stem. Packing is provided in the gland. Upper and lower positioning ring surfaces E and F are provided at the contact part of the valve stem and the valve body. The diameters of the two positioning ring surfaces are larger than the diameter of the packing cooperating with the valve stem.

6. The jacket-insulated flanged high-temperature and high-pressure bi-directional hard-sealed ball valve according to claim 5, wherein: A friction plate is provided at the end of the upper positioning ring surface E, and the friction plate is provided between the gland and the upper positioning ring surface E.

7. The jacket-insulated flanged high-temperature and high-pressure bi-directional hard-sealed ball valve according to claim 5, characterized in that: A bracket is installed on the gland, and the bracket is used to connect with an actuator.

8. The jacket-insulated flanged high-temperature and high-pressure bi-directional hard-sealed ball valve according to claim 1, characterized in that: A middle flange gasket for pressure test and inspection before welding is provided between the valve body and the valve cover.

9. The jacket-insulated flange-type high-temperature and high-pressure bi-directional hard-sealed ball valve according to claim 1, wherein: The thermal insulation jacket is fixedly connected to the outside of the valve body and the valve cover. A flow channel for the flow of the thermal insulation medium is provided in the thermal insulation jacket, and a drain plug is connected to the flow channel.

10. The jacket-insulated flange-type high-temperature and high-pressure bi-directional hard-sealed ball valve according to claim 9, wherein: The thermal insulation medium is heat-conducting oil or other media with a working temperature above 350 °C.

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