A new type of hard seal jacketed three-way floating ball valve

Abstract

The present application relates to the field of valve technology, and more particularly to a novel hard-sealed jacketed three-way floating ball valve. The ball valve comprises a valve body and three valve cover bodies connected thereto. The valve body and the valve cover bodies are respectively provided with a valve body jacket and a valve cover jacket, and form a valve body insulation medium passage and a valve cover insulation medium passage. An exchange passage is provided between the valve cover insulation medium passage and the valve body insulation medium passage, which together constitute an insulation system having an insulation medium inlet and outlet. In addition, the valve cover jacket covers the neck section of the valve cover body, and the valve body jacket covers the rest of the valve body. A ball and an L-shaped flow channel are provided in the valve body, and a graphite gasket and a disc spring are provided between the ball and the valve cover body to ensure good sealing performance. The present application achieves the effect of improving the insulation effect and sealing performance of the valve and extending its service life.

Description

Technical Field

[0001] The present application relates to the field of ball valves, and in particular to a novel hard-sealed jacketed three-way floating ball valve. Background Art

[0002] A ball valve is a valve whose opening and closing parts are driven by the valve stem and rotate around the axis of the valve stem. It is mainly used to cut off or connect the medium in the pipeline, and can also be used for fluid regulation and control. In actual application scenarios, some fluid media (such as melamine, BPA chemicals, asphalt, etc.) have high requirements for the working environment temperature (≥280C°), and crystallization or solidification is not allowed. Therefore, under the working conditions of such fluid media, the outside of the ball valve needs to be pretended to be a jacket for heat preservation.

[0003] The jacket in the related art is usually of a fully enclosed type, which is used to cover various parts of the valve body to achieve the desired heat preservation / cold preservation effect.

[0004] With respect to the above-mentioned related technologies, the inventor believes that there are the following defects: the fully enclosed jacket is not convenient for repairing the valve body or performing daily maintenance and replacement of accessories. The arrangement of the valve structure can only be removed after the jacket is destroyed, and then repairs can be performed. After the repairs are completed, the entire new jacket must be replaced and re-welded, which is inconvenient and needs to be improved. Summary of the invention

[0005] In order to improve the convenience of valve body maintenance, the present application provides a new hard-sealed jacketed three-way floating ball valve.

[0006] The present application provides a new type of hard-sealed jacketed three-way floating ball valve adopts the following technical solution: A new type of hard-sealed jacketed three-way floating ball valve comprises a valve body and three valve cover bodies connected to the valve body, the valve body is provided with a valve body jacket, the valve cover body is provided with a valve cover jacket, a valve body insulation medium passage is provided between the valve body jacket and the valve body, a valve cover insulation medium passage is provided between the valve cover jacket and the valve cover body, an exchange passage is provided between the valve cover insulation medium passage and the valve body insulation medium passage, the valve body insulation medium passage, the valve cover insulation medium passage and the exchange passage form an insulation system, and the insulation system has an insulation medium inlet and an insulation medium outlet.

[0007] By adopting the above technical solution, a split jacket design is realized, so that the structure of each part can be removed without destroying the jacket, which is convenient for maintenance personnel to clearly understand the structure of the ball valve. At the same time, during actual maintenance, only the corresponding valve cover jacket or valve body jacket needs to be removed for the part that needs maintenance, without the need for overall disassembly, which is more convenient to operate. In addition, by using the insulation medium to flow in the insulation system for active heat exchange, the ball valve can be heated, insulated and cooled to better meet the requirements of different working conditions.

[0008] Preferably, the valve cover jacket covers the neck section of the valve cover body, and the cross-section of the valve cover heat-insulating medium passage is annular.

[0009] By adopting the above technical solution, the valve cover jacket covers the neck section of the valve cover body, making the insulation effect of the valve cover body more uniform and stable. At the same time, the cross-section of the valve cover insulation medium passage is designed to be annular, which further improves the heat transfer efficiency of the insulation medium during the circulation process, ensures that the temperature distribution of the valve cover body is more uniform, and effectively prevents the problem of medium crystallization or solidification caused by local low temperature.

[0010] Preferably, the three valve cover bodies are respectively connected in sequence to three sequentially connected outer surfaces of the valve body, a valve stem is connected to another outer surface of the valve body, the valve body jacket covers the remaining two outer surfaces of the valve body, and the cross-section of the valve body insulation medium passage is L-shaped.

[0011] By adopting the above technical solution, the internal structure of the valve body is complex and there are many accessories. It is the place where maintenance and replacement of accessories are mainly required. Therefore, the valve body is installed in a "semi-wrapped" manner. Among the remaining four outer surfaces, three outer surfaces can be insulated by heat exchange through the valve cover insulation medium passage. The last outer surface is where the valve stem is located, which is often installed on other equipment and structural surfaces. Therefore, this outer surface belongs to the "inside" side and is not easily affected by the external ambient temperature. Therefore, although the present application adopts a "semi-wrapped" method for the valve body, the ball valve as a whole can still be in a better insulation state.

[0012] Preferably, the thermal insulation system is provided with a reserved hole, and a plug is detachably connected in the reserved hole.

[0013] By adopting the above technical solution, the reserved hole design of the insulation system allows operators to easily check, replace and maintain the temperature and insulation medium in the insulation system without removing the entire jacket. This design not only improves the convenience of repair and maintenance, but also reduces the risk of damage caused by frequent disassembly and assembly of the jacket, and extends the service life of the equipment. Specifically, the detachable plug design in the reserved hole ensures the sealing and reliability of the insulation system, while facilitating quick opening and closing, improving operating efficiency.

[0014] Preferably, a sphere is arranged inside the valve body, an L-shaped flow channel is arranged inside the sphere to communicate with two of the three valve cover bodies, a graphite gasket is arranged at one end of the valve cover body facing the sphere, the graphite gasket is against the sphere, a disc spring is arranged between the valve cover body and the graphite gasket, and a graphite gasket is arranged between the disc spring and the graphite gasket.

[0015] By adopting the above technical solution, the L-shaped flow channel set inside the ball body is connected to two of the three valve cover bodies, realizing the effective circulation and control of the fluid inside the ball valve. At the same time, the graphite gasket set at one end of the valve cover body facing the ball body abuts against the ball body, ensuring the sealing performance of the fluid channel. Furthermore, the disc spring and graphite gasket set between the valve cover body and the graphite gasket enhance the preload force of the graphite gasket, thereby improving the sealing reliability and service life.

[0016] Preferably, the valve body is provided with a valve hole, a valve stem is provided in the valve hole, the valve stem is connected to the ball through a thrust pad, and a packing group is provided between the valve stem and the valve hole.

[0017] By adopting the above technical solution, the valve hole and valve stem set inside the valve body are connected to the ball through the thrust pad, which not only improves the connection stability between the ball and the valve stem, but also ensures that the ball can rotate smoothly in the valve body, thereby improving the operating performance of the ball valve. At the same time, the packing set set between the valve stem and the valve hole effectively prevents external impurities from entering the valve body, ensuring the sealing performance and service life of the ball valve.

[0018] Preferably, the valve body is connected to a bracket, the bracket is provided with a pressure plate, the pressure plate is provided with a pressure hole for the valve stem to pass through, the valve stem is abutted against the pressure hole, a spring washer is provided between the pressure plate and the valve body, and the pressure plate and the valve body are connected via a clamping mechanism.

[0019] By adopting the above technical scheme, the valve body is connected to the bracket, the bracket is provided with a pressure plate, the pressure plate is provided with a pressure hole for the valve stem to pass through, the valve stem is abutted against the pressure hole, a spring washer is provided between the pressure plate and the valve body, and the pressure plate and the valve body are connected by a clamping mechanism, so that the connection state between the valve stem, thrust pad and ball is more stable, thereby improving the overall reliability and service life of the ball valve.

[0020] Preferably, the bracket is provided with a coupling, and the coupling is connected to the valve stem.

[0021] By adopting the above technical solution, the bracket is provided with a coupling, and the coupling is connected to the valve stem, thereby realizing an effective connection between the valve stem and the drive device, improving the transmission efficiency and stability, and ensuring the operational reliability and service life of the ball valve.

[0022] Preferably, a metal spiral wound gasket is provided between the valve body and the valve cover body.

[0023] By adopting the above technical solution, the provision of the metal spiral wound gasket enhances the sealing performance between the valve body and the valve cover body, effectively prevents leakage of high-temperature media, and improves the overall reliability and safety of the ball valve.

[0024] Preferably, a guide plate is disposed around the outer side of the valve cover body, the guide plate is located inside the valve cover heat preservation medium passage, and the guide plate width is smaller than the thickness of the valve cover heat preservation medium passage.

[0025] By adopting the above technical solution, the setting of the guide plate allows the insulation medium to flow in the insulation medium passage of the valve cover, and a part of it moves along the spiral direction of the guide plate, which prolongs the flow path of the insulation medium, increases the contact time between the insulation medium and the valve cover body, and improves the insulation effect. At the same time, the water flow disturbance generated when the two insulation media with different flow directions converge further promotes the uniform distribution and circulation of the insulation medium, reduces the generation of dead corners, and ensures that the insulation effect in the insulation medium passage of the entire valve cover is more uniform and stable.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. The split jacket design allows the structure of each part of the ball valve to be cleared without destroying the jacket, making it easier for maintenance personnel to clearly understand the structure of the ball valve, thus improving the convenience and efficiency of maintenance; 2. During actual maintenance, only the valve cover jacket or valve body jacket needs to be removed, without the need to disassemble the traditional integrated jacket as a whole, which simplifies the maintenance steps and reduces maintenance time and cost; 3. Active heat exchange can be performed by utilizing the flow of the insulation medium in the insulation system to achieve heating, insulation and cooling of the ball valve, and the required working conditions can be accurately controlled, thereby improving the reliability and stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the structure of an embodiment of the present application; Figure 2 This is a structural schematic diagram for illustrating the connection relationship between the valve body insulation medium passage and the valve cover insulation medium passage in the embodiment of the present application; Figure 3 A top view of an embodiment of the present application; Figure 4 for Figure 3 Cross-sectional view along AA direction; Figure 5 for Figure 3 Cross-sectional view along direction BB; Figure 6 This is a structural schematic diagram for illustrating the connection relationship between the guide plate and the valve cover body in the embodiment of the present application; Figure 7 It is a structural schematic diagram used to reflect the connection relationship between the spoiler strip and the valve body in the embodiment of the present application.

[0028] In the figure: 1. Valve body; 11. Valve body jacket; 12. Valve body insulation medium passage; 13. Reserved hole; 14. Plug; 15. Ball; 16. Metal spiral wound gasket; 2. Valve cover body; 21. Valve cover jacket; 22. Valve cover insulation medium passage; 23. Graphite gasket; 24. Disc spring; 25. Graphite gasket; 3. Exchange passage; 31. Insulation medium inlet; 32. Insulation medium outlet; 4. Valve stem; 40. Valve hole; 41. Thrust pad; 42. Packing group; 5. Bracket; 51. Pressing plate; 52. Pressing hole; 53. Spring washer; 54. Pressing mechanism; 6. Guide vane; 7. Spoiler strip; 71. Spoiler hole. DETAILED DESCRIPTION

[0029] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the present invention. The described embodiments are only possible technical implementations of the present invention, not all possible implementations. Those skilled in the art can completely combine the embodiments of the present invention to obtain other embodiments without creative work, and these embodiments are also within the scope of protection of the present invention.

[0030] The inventor of this application found that the fully enclosed jacket in the prior art is not convenient for repairing the valve body or performing daily maintenance and replacement of accessories. The jacket must be destroyed to clear the arrangement of the valve structure, and then repair and replace the entire new jacket for re-welding, which is inconvenient. For this reason, this application mainly adopts the following split jacket setting to achieve the effect of improving the convenience of maintenance. The following is a further detailed description of this application.

[0031] Reference Figure 1 The novel hard-sealed jacketed three-way floating ball valve provided in the embodiment of the present application comprises a valve body 1 and three valve cover bodies 2 connected to the valve body 1. The top surface and one of the side surfaces of the valve body 1 are provided with a valve body jacket 11, and the valve body jacket 11 is L-shaped. The valve cover body 2 is provided with a valve cover jacket 21, and the valve cover jacket 21 is sleeved to the outside of the valve cover body 2.

[0032] Reference Figure 2There is a valve body insulation medium passage 12 between the valve body jacket 11 and the valve body 1, there is a valve cover insulation medium passage 22 between the valve cover jacket 21 and the valve cover body 2, and an exchange passage 3 is provided between the valve cover insulation medium passage 22 and the valve body insulation medium passage 12, and the exchange passage 3 can actually be implemented by using a steel pipe. The valve body insulation medium passage 12, the valve cover insulation medium passage 22 and the exchange passage 3 form an insulation system, and the insulation system has an insulation medium inlet 31 and an insulation medium outlet 32. The ball valve is insulated by transporting the insulation medium in the insulation system. Through the split jacket setting, the structure of each part of the ball valve covered by the jacket can be removed without destroying the jacket, which is convenient for maintenance personnel to clearly understand the structure of the ball valve. In addition, during actual maintenance, only the valve cover jacket 21 or the valve body jacket 11 of the part that needs to be repaired can be disassembled, without the need to disassemble the traditional integrated jacket as a whole, which is more convenient to operate. Furthermore, active heat exchange can be performed by using the flow of the insulation medium in the insulation system to heat up, keep warm, and cool down the ball valve, and more accurately control the required working conditions.

[0033] The cross-sections of the valve body insulation medium passage 12 and the valve cover insulation medium passage 22 can be designed to be circular, rectangular or other shapes to adapt to different fluid characteristics. For example, if the insulation medium is water or steam, it can be designed to be a circular cross-section to reduce flow resistance; if the insulation medium is an oil substance, it can be designed to be a rectangular cross-section to increase the contact area. The valve body insulation medium passage 12 and the valve cover insulation medium passage 22 are connected by an exchange passage 3 to adapt to different layout requirements. The insulation medium inlet 31 and the insulation medium outlet 32 ​​can be set at any position of the valve body jacket 11 or the valve cover jacket 21. For example, the insulation medium inlet 31 can be set at the bottom of the valve cover jacket 21 on the left side of the figure, and the insulation medium outlet 32 ​​can be set at the top of the valve cover jacket 21 on the right side of the figure to fully promote the flow of the insulation medium.

[0034] The insulation system is also provided with a reserved hole 13. In this embodiment, the reserved hole 13 is provided on the valve body jacket 11, and a plug 14 is detachably connected to the reserved hole 13. The position of the reserved hole 13 can be adjusted according to actual needs. For example, it can be provided in the middle or edge of the valve body jacket 11 to facilitate observation and maintenance. The material of the plug 14 can be selected from the same material as the valve body jacket 11 to ensure good sealing performance. The plug 14 can be connected to the reserved hole 13 by means of threads or buckles, etc., for easy disassembly and installation.

[0035] A sphere 15 is arranged inside the valve body 1, and an L-shaped flow channel is arranged inside the sphere 15 to communicate with two of the three valve cover bodies 2. The end of the valve cover body 2 extends into the valve body 1, and a metal wound gasket 16 is arranged at the step of the connection position between the valve body 1 and the valve cover body 2. The material of the metal wound gasket 16 can be selected from stainless steel or carbon steel to adapt to the high temperature and high pressure working environment. The structure of the metal wound gasket 16 can be designed to be wavy or flat to meet different sealing requirements. The thickness of the metal wound gasket 16 can be adjusted according to actual needs, for example, it can be designed to be 0.5mm or 1mm to provide sufficient sealing performance.

[0036] A graphite gasket 23 is provided at one end of the valve cover body 2 facing the ball 15, and the graphite gasket 23 abuts against the ball 15. A disc spring 24 is also provided between the end of the valve cover body 2 and the graphite gasket 23, and a graphite gasket 25 is provided between the disc spring 24 and the graphite gasket 23. The selection of the graphite gasket 23 and the graphite gasket 25 can improve the sealing performance when the ball 15 and the valve cover body 2 are in communication. The material of the graphite gasket 23 and the graphite gasket 25 can be selected from high-quality flexible graphite to adapt to the working environment of high temperature and high pressure. The material of the disc spring 24 can be selected from stainless steel or alloy steel to provide sufficient elasticity and stability.

[0037] Reference Figure 3 , Figure 4 and Figure 5 The back of the valve body 1 is provided with a valve hole 40, in which a valve stem 4 is provided, and the valve stem 4 is connected to the ball 15 through a thrust pad 41, and a packing group 42 is provided between the valve stem 4 and the valve hole 40. The material of the valve stem 4 can be stainless steel or alloy steel to adapt to the high temperature and high pressure working environment. The material of the thrust pad 41 can be copper or aluminum alloy to provide good lubrication performance. The material of the packing group 42 can be high-quality graphite or polytetrafluoroethylene to provide good sealing performance.

[0038] The back of the valve body 1 is connected with a bracket 5, and the material of the bracket 5 can be stainless steel or carbon steel to adapt to the high temperature and high pressure working environment. A pressure plate 51 is arranged inside the bracket 5, and the material of the pressure plate 51 can be stainless steel or aluminum alloy to provide good rigidity and stability. The pressure plate 51 is provided with a pressure hole 52 for the valve stem 4 to pass through, and the inner edge of the pressure hole 52 is provided with a conical surface to abut against the convex part of the side of the valve stem 4. A spring washer 53 is arranged between the pressure plate 51 and the valve body 1, and the material of the spring washer 53 can be stainless steel or alloy steel to provide sufficient elasticity. The pressure plate 51 is connected to the valve body 1 through a clamping mechanism 54, and the clamping mechanism 54 can be made of hexagonal bolts. The hexagonal bolts cooperate with the spring washers 53 to press the pressure plate 51 against the valve stem 4, so that the connection state between the valve stem 4, the thrust pad 41, and the ball 15 is more stable.

[0039] Reference Figure 6 , a guide plate 6 is wound around the outside of the valve cover body 2, and the guide plate 6 is located inside the valve cover insulation medium passage 22 and the width of the guide plate 6 is less than the thickness of the valve cover insulation medium passage 22. The material of the guide plate 6 can be selected from stainless steel or carbon steel to adapt to the high temperature and high pressure working environment. The shape of the guide plate 6 is designed to be spiral, and the width of the guide plate 6 can be adjusted according to actual needs to provide sufficient guiding effect. The function of the guide plate 6 is to make a part of the insulation medium flow process spirally move along the winding direction of the guide plate 6, and the other part is located at the outer edge of the guide plate 6 and the valve cover insulation medium passage 22. The spirally moving fluid will drive the main flow direction of the insulation medium outside the valve cover body 2. On the one hand, the flow path is increased to make the contact time longer and the insulation effect better. On the other hand, the confluence of the two fluids will also increase the water flow disturbance in the valve cover insulation medium passage 22, so that the water flow in the corner can also better participate in the fluid circulation, reducing the probability of dead water area.

[0040] Reference Figure 7 The top outer surface of the valve body 1 is also provided with a spoiler belt 7, the end of which is fixed to the top outer surface of the valve body 1 by a support rod. The spoiler belt 7 is made of elastic material or is folded in multiple places to form an accordion shape. The spoiler belt 7 is C-shaped and surrounds the lower part of the water outlet of the top exchange passage 3. When the water flow increases, the spoiler belt 7 is stretched open, and when the water flow decreases, the spoiler belt 7 shrinks. The width of the spoiler belt 7 is less than the thickness of the valve body insulation medium passage 12, so that the unstable water flow can be used or the flow rate of the insulation medium can be directly set to a pulse type to achieve uninterrupted contraction and stretching of the spoiler belt 7, thereby increasing the turbulence in the valve body insulation medium passage 12, so that the temperature distribution is uniform everywhere. The spoiler belt 7 is also penetrated with a spoiler hole 71. When the flow rate of the insulation medium increases sharply, it is difficult to flow only by the top gap of the spoiler belt 7. The insulation medium will be sprayed from the spoiler hole 71, thereby disturbing the insulation medium farther away.

[0041] In other embodiments, the valve body jacket 11 and the valve cover jacket 21 can also be installed in a magnetic connection. Magnets are embedded in the inner side of the valve body jacket 11 and the valve cover jacket 21, and the fixation with the valve body 1 and the valve cover body 2 is achieved by the attraction of the magnet. The material of the magnet can be selected from neodymium iron boron or samarium cobalt to provide a strong magnetic force. The shape of the magnet can be customized according to the shape of the jacket. For example, it can be designed to be a long strip or a circle to better fit the inner wall of the jacket. The installation position of the magnet can be adjusted according to actual needs. For example, it can be evenly distributed on the inner side of the jacket to provide a uniform magnetic force distribution. The advantage of the magnetic connection is that disassembly and installation are more convenient and quick, no additional tools are required, and maintenance time and cost are reduced. Of course, this connection method is limited to non-high-pressure working scenarios.

[0042] In addition to the conventional continuous supply of fluids that have been used to achieve thermal insulation, the thermal insulation medium of the thermal insulation system can also be selected from phase change materials. Phase change materials undergo phase changes within a specific temperature range, absorbing or releasing a large amount of latent heat, thereby playing a role in thermal insulation or cooling. The selection of phase change materials can be adjusted according to actual needs, for example, paraffin, salt hydrates or organic compounds can be selected. The shape of the phase change material can be customized according to the shape of the thermal insulation medium passage, for example, it can be designed to be granular or blocky to meet different filling requirements. The filling method of the phase change material can be pre-packaged, that is, the phase change material is pre-packaged in a small bag or bottle and then placed in the thermal insulation medium passage. The filling amount of the phase change material can be adjusted according to actual needs, for example, it can be designed to account for 60% to 80% of the volume of the thermal insulation medium passage to provide sufficient phase change capacity. The advantage of phase change materials is that they can achieve long-term thermal insulation or cooling effects, reduce the need for continuous supply of thermal insulation media, and save energy and costs.

[0043] The valve body 1 and the valve cover body 2 may also be connected by a quick-connect connector. The quick-connect connector can realize the rapid disassembly and installation of the valve body 1 and the valve cover body 2, reducing maintenance time and cost. The material of the quick-connect connector can be stainless steel or carbon steel to adapt to high temperature and high pressure working environments. The structure of the quick-connect connector can be designed as a snap-on type or a threaded type to meet different connection requirements. The size of the quick-connect connector can be adjusted according to actual needs. For example, it can be designed as a standard size or a custom size to adapt to different ball valve specifications. The advantage of the quick-connect connector is that disassembly and installation are more convenient and quick, and no additional tools are required, reducing maintenance time and cost.

[0044] The sealing method of the valve body 1 and the valve cover body 2 can also adopt a double-layer sealing structure. The double-layer sealing structure includes an inner sealing ring and an outer sealing ring. The materials of the inner sealing ring and the outer sealing ring can be selected from high-quality flexible graphite or polytetrafluoroethylene to adapt to high temperature and high pressure working environments. The shapes of the inner sealing ring and the outer sealing ring can be adjusted according to actual needs. For example, they can be designed as O-type or V-type to meet different sealing requirements. The installation positions of the inner sealing ring and the outer sealing ring can be adjusted according to actual needs. For example, they can be set near the contact surface of the valve body 1 and the valve cover body 2 to provide a double sealing effect. The advantage of the double-layer sealing structure is that it can provide higher sealing performance, avoid leakage problems caused by failure of a single seal, and improve the safety and reliability of the ball valve.

[0045] The implementation principle of this embodiment is: through the split jacket setting, the ball valve covered by the jacket can be cleared of the structure of each part without destroying the jacket, which is convenient for maintenance personnel to clearly understand the structure of the ball valve. In addition, during actual maintenance, only the valve cover jacket 21 or the valve body jacket 11 of the part that needs maintenance can be disassembled, without the need to disassemble the traditional integrated jacket as a whole, which is more convenient to operate. Furthermore, active heat exchange can be carried out by using the flow of insulation medium in the insulation system to heat up, keep warm, and cool down the ball valve, and more precise control of the required working conditions can be achieved. Through these designs, the maintenance convenience and maintenance efficiency of the ball valve are improved, while ensuring a good insulation effect. Through a variety of optimization designs such as magnetic connection, phase change material, quick connect joint and double-layer sealing structure, the performance and reliability of the ball valve are further improved.

[0046] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A new type of hard-seal jacketed three-way floating ball valve, comprising a valve body (1) and three valve cover bodies (2) connected to the valve body (1), characterized in that: The valve body (1) is provided with a valve body jacket (11), and the valve cover body (2) is provided with a valve cover jacket (21). A valve body heat preservation medium passage (12) is provided between the valve body jacket (11) and the valve body (1), a valve cover heat preservation medium passage (22) is provided between the valve cover jacket (21) and the valve cover body (2), and an exchange passage (3) is provided between the valve cover heat preservation medium passage (22) and the valve body heat preservation medium passage (12). The valve body heat preservation medium passage (12), the valve cover heat preservation medium passage (22) and the exchange passage (3) form a heat preservation system, and the heat preservation system has a heat preservation medium inlet (31) and a heat preservation medium outlet (32).

2. According to claim 1, a new type of hard-sealed jacketed three-way floating ball valve is characterized by: The valve cover jacket (21) covers the neck section of the valve cover body (2), and the cross section of the valve cover heat-insulating medium passage (22) is annular.

3. According to claim 1, a new type of hard-sealed jacketed three-way floating ball valve is characterized by: The three valve cover bodies (2) are respectively connected in sequence to three outer surfaces of the valve body (1) that are connected in sequence, a valve stem (4) is connected to another outer surface of the valve body (1), the valve body jacket (11) covers the remaining two outer surfaces of the valve body (1), and the cross-section of the valve body thermal insulation medium passage (12) is L-shaped.

4. According to claim 1, a new type of hard-sealed jacketed three-way floating ball valve is characterized by: The heat preservation system is provided with a reserved hole (13), and a plug (14) is detachably connected inside the reserved hole (13).

5. According to claim 1, the new hard-seal jacketed three-way floating ball valve is characterized by: A ball (15) is arranged inside the valve body (1), and an L-shaped flow channel is arranged inside the ball (15) to communicate with two of the three valve cover bodies (2). A graphite gasket (23) is arranged at one end of the valve cover body (2) facing the ball (15), and the graphite gasket (23) abuts against the ball (15). A disc spring (24) is arranged between the valve cover body (2) and the graphite gasket (23), and a graphite gasket (25) is arranged between the disc spring (24) and the graphite gasket (23).

6. According to claim 5, a new type of hard-sealed jacketed three-way floating ball valve is characterized in that: The valve body (1) is provided with a valve hole (40), a valve stem (4) is provided in the valve hole (40), the valve stem (4) is connected to the ball (15) via a thrust pad (41), and a packing group (42) is provided between the valve stem (4) and the valve hole (40).

7. According to claim 6, a new type of hard seal jacket three-way floating ball valve is characterized by: The valve body (1) is connected to a bracket (5), the bracket (5) is provided with a pressure plate (51), the pressure plate (51) is provided with a pressure hole (52) for the valve stem (4) to pass through, the valve stem (4) is abutted against the pressure hole (52), a spring washer (53) is provided between the pressure plate (51) and the valve body (1), and the pressure plate (51) and the valve body (1) are connected via a clamping mechanism (54).

8. According to claim 7, the new hard-seal jacketed three-way floating ball valve is characterized by: The bracket (5) is provided with a coupling, and the coupling is connected to the valve stem (4).

9. According to claim 5, a new type of hard-sealed jacketed three-way floating ball valve is characterized in that: A metal spiral wound gasket (16) is provided between the valve body (1) and the valve cover body (2).

10. According to claim 1, the novel hard-seal jacketed three-way floating ball valve is characterized by: A guide plate (6) is disposed around the outside of the valve cover body (2); the guide plate (6) is located inside the valve cover heat preservation medium passage (22); and the width of the guide plate (6) is smaller than the thickness of the valve cover heat preservation medium passage (22).

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