A sealing control valve suitable for high temperature working conditions

Abstract

This invention relates to a sealing regulating valve suitable for high-temperature operating conditions in the field of valve technology. The sealing regulating valve includes a body structure and a drive structure. The body structure includes a valve body, valve seat, valve core, valve cover, flow equalization shroud, and lower valve stem. The drive structure includes a support frame, a drive actuator module, and a manual drive module. This invention's sealing regulating valve solves the leakage problem caused by thermal deformation, aging, and creep of the seals in high-temperature environments through an innovatively designed high-temperature resistant composite sealing system. Specific designs have been made for the valve body, valve stem, and sealing mechanism, optimizing the thermal compensation design of the sealing structure. A reliable manual unlocking and drive interface is specifically provided in the drive structure, allowing operators to manually open the valve on-site even in the event of complete failure of the power source or actuator.

Description

Technical Field

[0001] This invention relates to the field of valve technology, specifically a sealing regulating valve suitable for high-temperature operating conditions. Background Technology

[0002] High-temperature control valves are widely used in petrochemical, power, and metallurgical industries, and their performance directly affects the safety and operating efficiency of the system. Existing high-temperature control valves, in long-term practical application, mainly suffer from the following four prominent technical shortcomings: 1. The sealing structure has poor high-temperature reliability and a high risk of leakage; To achieve good shut-off performance, conventional control valves often use soft sealing materials such as polytetrafluoroethylene (PTFE). However, in continuous high-temperature environments above 300°C, PTFE seals are prone to thermal deformation, aging, and carbonization, causing a rapid decrease in sealing pressure and resulting in media leakage, failing to meet emission standards under harsh operating conditions.

[0003] 2. The thermal expansion adaptation design is inadequate, resulting in both valve stem jamming and uncontrolled sealing gaps. Traditional high-temperature control valve designs do not fully consider the differences in the thermal expansion coefficients of key components such as the valve body, valve stem, and sealing components. When the valve is heated from room temperature to high temperature and operated for a long time, the mismatch in the expansion of the components can lead to a series of negative effects: on the one hand, the seals may be deformed or even extruded due to unexpected compression, or the clearance may increase abnormally, resulting in seal failure; on the other hand, the clearance between the valve stem and the guide sleeve may become smaller, making it prone to jamming and sluggish operation, which seriously affects the regulation accuracy and emergency shut-off function.

[0004] 3. The sealing structure has a short lifespan and high maintenance costs; Due to inherent deficiencies in sealing reliability and thermal expansion adaptability, the seals and sealing surfaces of existing high-temperature valves are subjected to severe friction and deformation cycles, resulting in poor reliability and a significantly shortened service life. Users are forced to frequently shut down equipment to replace seals, grind sealing surfaces, or perform overall valve overhauls. This not only leads to frequent replacements of vulnerable parts such as seals and high consumption of spare parts, but also results in persistently high maintenance costs due to unplanned downtime.

[0005] 4. Lack of manual emergency operation in case of drive failure, making repair and replacement difficult; In the event of a power failure or drive malfunction in the actuator of an existing high-temperature control valve, there is often a lack of reliable manual unlocking and drive interfaces, causing the valve to remain in the faulty position and unable to open or close actively. This could lead to safety accidents in emergency situations. Furthermore, replacing vulnerable internal parts of the valve is cumbersome, requiring the disassembly of numerous related components, which is time-consuming and can easily damage the sealing surface during maintenance, further increasing maintenance difficulty and downtime losses.

[0006] Therefore, we propose a sealing regulating valve suitable for high-temperature operating conditions. Summary of the Invention

[0007] The present invention mainly addresses the technical problems existing in the prior art and provides a sealing regulating valve suitable for high-temperature operating conditions.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A sealing regulating valve suitable for high-temperature operating conditions, the sealing regulating valve includes a body structure and a drive structure. The body structure includes a valve body, a valve seat, a valve core, a valve cover, a flow equalization shroud, and a lower valve stem. The drive structure includes a support frame, a drive actuator module, and a manual drive module. The valve body is provided with a valve seat inside, and a valve seat gasket is provided between the two. A liftable valve core is provided at the center of the valve seat. A flow equalization shroud is fitted on the outside of the valve core. A lower valve stem is provided inside the valve core. A valve core cover is fixedly connected at the contact position between the valve core and the flow equalization shroud. A metal sealing ring is provided below the valve core cover. The bottom end of the lower valve stem is fixedly connected to the center of the valve core. A valve cover is fixedly connected to the top of the valve body by fasteners. A valve cover gasket is provided at the sealing position between the valve cover and the flow equalization shroud and the top of the valve body. The valve cover is provided with a quick-release valve cover sealing structure at the top center. The valve cover sealing structure includes a quick-release ring, a packing base, packing, a disc spring, and a gland. The packing base, packing, and disc spring are placed inside the quick-release ring in sequence from low to high, and then pressed together by the gland. A sealing gasket is provided between the quick-release ring and the valve cover. The bottom end of the support frame is fixedly connected to the valve cover by fasteners. The drive actuator module is fixed to the top of the support frame, and the manual drive module is fixed to the side of the support frame. The drive actuator module includes a liftable upper valve stem. The bottom end of the upper valve stem is provided with a rotatably connected pull cylinder, and the top end of the lower valve stem is inserted into the cavity inside the pull cylinder. The manual drive module includes a horizontally moving push block, a locking block, and a vertically moving pressure cylinder. The pressure cylinder presses against the pressure cap. When the push block moves away from the lower valve stem, the locking block can pull the lower valve stem upward, and the pressure cylinder rises away from the pressure cap. When the push block approaches the lower valve stem, the locking block retracts and moves away, and the pressure cylinder presses against the pressure cap.

[0009] Preferably, the valve seat is made of cobalt-based hard alloy, and the hard alloy is welded onto the surface of the valve seat, and the bottom outer edge of the valve core has a chamfer.

[0010] Preferably, the metal sealing ring is made of Inconel 718 precipitation-hardening nickel-chromium-iron alloy.

[0011] Preferably, the lower valve stem drives the valve core to move up and down synchronously. The lower half of the lower valve stem is provided with a guide bar on its side, the upper half of the lower valve stem is provided with a first guide wheel that is rotatably connected, and the top of the lower valve stem is provided with a first guide post that is fixedly connected. The bottom of the flow equalization shroud is pressed on the valve seat, the valve cover is pressed against the flow equalization shroud and the top of the valve body, and the valve cover is provided with an internal valve guide block. The guide bar slides directionally along the internal valve guide block.

[0012] Preferably, the disc spring elastically deforms to compensate for the thermal expansion difference between the valve stem and the valve cover, the packing uses double-layer flexible graphite packing, and the gland is pre-tightened with constant force.

[0013] Preferably, the support frame is provided with a scale and a guide frame that are fixedly connected inside. The guide frame is provided with a through guide groove inside. The upper valve stem is provided with a pointer that is fixedly connected to the side. When the upper valve stem moves, the pointer changes the reading on the scale.

[0014] Preferably, the pull cylinder has an internal cavity, and the side of the cavity has an axially arranged L-shaped guide groove. The L-shaped guide groove is divided into a vertical groove and a horizontal groove. The pull cylinder has a slidingly fitted pressure ring and a fixedly connected locking groove on its exterior. A spring is provided between the pressure ring and the top of the pull cylinder. The pressure ring has an axially arranged locking tongue. The number of locking grooves is the same as the number of locking tongues. The first guide post is inserted into the horizontal groove of the L-shaped guide groove, and the locking tongue will lock in the horizontal groove. The upper valve rod pulls the lower valve rod synchronously up and down through the pull cylinder.

[0015] Preferably, the manual drive module includes a mounting bracket, inside which is a threaded push rod. One end of the push rod is fixedly connected to a turntable, and the other end is a push block. When the push rod rotates and moves, it drives the push block to move laterally in sync. Above the push block is a movable locking block, and below the push block is a pressure cylinder. An elastic push rod is provided between the push block and the pressure cylinder. Inside the elastic push rod is a pressure vessel and a pressure sensor. When the extension and retraction length of the elastic push rod changes, the pressure sensor changes the pressure value in real time. A fixed push rod is provided between the push block and the locking block.

[0016] Preferably, the pressure cylinder has a cavity inside, and a through hole is provided at the top of the cavity. The cavity of the pressure cylinder presses against the upper end of the pressure cap, and the lower valve rod passes through the through hole.

[0017] Preferably, the locking block moves laterally inside the guide frame. The locking block has a through slot inside, and inclined slots are provided on both sides of the slot. The opening of the slot is at the same height as the first guide wheel. A second guide wheel is provided on the outside of the locking block and rotates and is guided within the guide slot.

[0018] This invention provides a sealing regulating valve suitable for high-temperature operating conditions. It has the following beneficial effects: (1) The sealing regulating valve of this invention solves the leakage problem caused by thermal deformation, aging, and creep of the sealing components under high temperature environment through an innovatively designed high-temperature resistant composite sealing system. It effectively avoids the thermal decay problem of pure PTFE soft seals and overcomes the shortcomings of low precision and rapid wear of pure metal hard seals. This solution ensures that the sealing pair always maintains a stable and appropriate sealing specific pressure under alternating temperature conditions above 300℃, thereby eliminating thermal deformation leakage and rapid wear of the sealing surface from the root and significantly extending the leak-free service life of the valve.

[0019] (2) The present invention has made targeted designs for valve body, valve stem, sealing mechanism, etc., optimized the thermal compensation design of sealing structure, adapted to the thermal expansion difference under high temperature conditions, avoided excessive sealing gap or deformation of sealing parts, and ensured long-term stable sealing; effectively prevented sealing parts from failing due to abnormal compression or excessive gap, and ensured smooth operation and high sealing performance of valve throughout the entire temperature range.

[0020] (3) The present invention can maintain good working conditions during use and its service life is extended by several times compared with traditional high temperature valves. This not only directly reduces the frequency of replacement of seals and spare parts inventory, but also greatly reduces unplanned shutdowns caused by valve failures, significantly saving overall operation and maintenance costs and manpower input.

[0021] (4) The present invention has a reliable manual unlocking and driving interface specially set in the drive structure. Even if the power source or actuator fails completely, the operator can manually open the valve on site, ensuring the ability to operate safely in extreme conditions. At the same time, the modular and easy-to-disassemble structural design allows the replacement of vulnerable parts such as seals to be completed online quickly without disassembling the valve body or taking the whole machine off the production line. This greatly shortens the maintenance time, reduces the maintenance difficulty, and improves the availability of the device. Attached Figure Description

[0022] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0023] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0024] Figure 1 This is a cross-sectional view of a sealing regulating valve suitable for high-temperature operating conditions in an embodiment of the present invention. Figure 2 For the present invention Figure 1 Enlarged schematic diagram of the structure at point A in the middle; Figure 3 For the present invention Figure 1 Enlarged schematic diagram of the structure at point B; Figure 4 For the present invention Figure 1 Enlarged schematic diagram of the structure at point C; Figure 5 This is a schematic diagram of the structure of the pull cylinder in an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the manual drive module in an embodiment of the present invention; Figure 7 For the present invention Figure 1 Enlarged schematic diagram of the structure at point D; Legend: 1. Valve body; 2. Valve seat; 3. Valve core; 4. Valve cover; 5. Support frame; 6. Drive actuator module; 7. Flow equalization shroud; 8. Lower valve stem; 9. Manual drive module; 21. Hard alloy overlay; 31. Valve core gland; 32. Metal sealing ring; 41. Internal guide block; 42. Quick release ring; 43. Packing bottom gasket; 44. Packing; 45. Disc spring; 46. Gland; 51. Scale; 52. Guide frame; 61. Upper valve stem; 62. Pull cylinder; 81. Guide bar; 82. First guide wheel; 83. First guide post; 91. Mounting bracket; 92. Push rod; 93. Push block; 94. Pressure cylinder; 95. Locking block; 96. Elastic push rod; 97. Fixed push rod; 101. Valve seat gasket; 102. Valve cover gasket; 103. Sealing gasket; 521. Guide groove; 611. Pointer; 621. L-shaped guide groove; 622. Pressure ring; 623. Locking tongue; 624. Locking groove; 921. Turntable; 941. Through hole; 951. Empty groove; 952. Locking groove; 953. Second guide wheel. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Please see Figures 1 to 7As shown, this embodiment provides a sealing regulating valve suitable for high-temperature operating conditions. The sealing regulating valve includes a body structure and a drive structure. The body structure includes a valve body 1, a valve seat 2, a valve core 3, a valve cover 4, a flow equalization shroud 7, and a lower valve stem 8. A valve seat 2 is installed inside the valve body 1, with a valve seat gasket 101 between them. The valve seat 2 is made of cobalt-based hard alloy, and a hard alloy 21 (such as a cobalt-based or nickel-based alloy) is welded onto the surface of the valve seat 2 to improve wear resistance. A liftable valve core 3 is provided at the center of the valve seat 2. The bottom outer edge of the valve core 3 has a chamfer. When the valve core 3 descends to the lowest point, the bottom chamfer of the valve core 3 contacts the valve seat 2, and the two seal and isolate the valve body 1. A flow equalization cover 7 is fitted on the outside of the valve core 3, and a lower valve stem 8 is provided inside the valve core 3. A valve core cover 31 is fixedly connected to the outer side of the valve core 3 at the contact position with the flow equalization cover 7. A metal sealing ring 32 is provided below the valve core cover 31. The metal sealing ring 32 is made of precipitation hardening nickel-chromium-iron alloy of Inconel 718 (Chinese grade GH4169).

[0027] The bottom end of the lower valve stem 8 is fixedly connected to the inner center of the valve core 3. The lower valve stem 8 drives the valve core 3 to move up and down synchronously. The lower half of the lower valve stem 8 is provided with a guide bar 81, the upper half of the lower valve stem 8 is provided with a first guide wheel 82 that is rotatably connected, and the top of the lower valve stem 8 is provided with a first guide post 83 that is fixedly connected.

[0028] The valve body 1 has a valve cover 4 fixedly connected by fasteners at the top. The bottom of the flow equalization shroud 7 is pressed on the valve seat 2. The valve cover 4 presses against the flow equalization shroud 7 and the top of the valve body 1. A valve cover gasket 102 is provided at the sealing point between the valve cover 4, the flow equalization shroud 7 and the top of the valve body 1. The valve cover 4 has an internal valve guide block 41. The guide strip 81 slides in a direction along the internal valve guide block 41. After the valve body 1, valve seat 2, valve core 3, valve cover 4, flow equalization shroud 7 and lower valve stem 8 are assembled, the valve core 3 and lower valve stem 8 can be raised and lowered in a direction. The valve core 3 and lower valve stem 8 will not rotate. The valve cover 4 has a quick-release valve cover sealing structure at the top center. The valve cover sealing structure includes a quick-release ring 42, a packing base 43, a packing 44, a disc spring 45, and a gland 46. The packing base 43, packing 44, and disc spring 45 are placed inside the quick-release ring 42 in sequence from low to high, and then pressed by the gland 46. A sealing gasket 103 is provided between the quick-release ring 42 and the valve cover 4. The packing base 43, packing 44, and disc spring 45 play a disc spring-type thermal compensation function between the lower valve stem 8 and the valve cover 4. The elastic deformation of the disc spring 45 compensates for the thermal expansion difference between the lower valve stem 8 and the valve cover 4, avoiding jamming when the lower valve stem 8 rises and falls, and ensuring that the sealing pre-tightening force of the lower valve stem 8 is constant. The packing 44 adopts double-layer flexible graphite packing, which, together with the constant force pre-tightening of the gland 46, ensures the reliability of the packing 44 seal at high temperature and avoids leakage from the sealing regulating valve. When disassembling, replacing or maintaining, unlock the gland 46, and then use the quick-release ring 42 to remove the packing base 43, packing 44 and disc spring 45 at once, without the need to remove or replace them individually with tools.

[0029] In this embodiment, the sealing gaskets are all made of metal, which solves the leakage problem caused by thermal deformation, aging, and creep of the sealing gaskets under high temperature conditions.

[0030] The drive structure includes a support frame 5, a drive actuator module 6, and a manual drive module 9. The drive actuator module 6 can adopt a pneumatic diaphragm, electric, or hydraulic drive structure. This embodiment shows a pneumatic diaphragm actuator.

[0031] The bottom end of the support frame 5 is fixedly connected to the valve cover 4 by fasteners. The support frame 5 is equipped with a fixedly connected scale 51 and guide frame 52. The guide frame 52 is equipped with a through guide groove 521. The drive actuator module 6 is fixed to the top of the support frame 5, and the manual drive module 9 is fixed to the side of the support frame 5.

[0032] The actuator module 6 includes a liftable upper valve stem 61. A pointer 611 is fixedly connected to the side of the upper valve stem 61. When the upper valve stem 61 moves, the pointer 611 changes the reading on the scale 51. A pull cylinder 62 is rotatably connected to the bottom of the upper valve stem 61. The pull cylinder 62 has a cavity inside. An L-shaped guide groove 621 is axially arranged on the side of the cavity. The L-shaped guide groove 621 is divided into a vertical groove and a horizontal groove. A slidingly fitted pressure ring 622 and a fixedly connected locking groove 624 are provided on the outside of the pull cylinder 62. A spring is provided between the pressure ring 622 and the top of the pull cylinder 62. When there is no external force, the spring pushes the pressure ring 622 down. A locking tongue 623 is axially arranged on the pressure ring 622. The number of locking grooves 624 is the same as the number of locking tongues 623, and the two are on the same coaxial line. When there is no external force, the locking tongue 623 is inserted into the locking groove 624. The top of the lower valve stem 8 is inserted into the cavity inside the pull cylinder 62, the first guide post 83 is inserted into the transverse groove of the L-shaped guide groove 621, the locking tongue 623 will lock in the transverse groove, and the upper valve stem 61 pulls the lower valve stem 8 to rise and fall synchronously through the pull cylinder 62.

[0033] The manual drive module 9 includes a mounting bracket 91, inside which is a threaded push rod 92. One end of the push rod 92 is fixedly connected to a turntable 921, and the other end of the push rod 92 is connected to a push block 93. When the push rod 92 rotates and moves, it drives the push block 93 to move laterally in sync. Above the push block 93 is a movable locking block 95, and below the push block 93 is a pressure cylinder 94. Between the push block 93 and the pressure cylinder 94 is an elastic push rod 96. Inside the elastic push rod 96 is a pressure vessel and a pressure sensor. When the extension and retraction length of the elastic push rod 96 changes, the pressure sensor changes the pressure value in real time. One end of the elastic push rod 96 is rotatably connected to the push block 93, and the other end of the elastic push rod 96 is rotatably connected to the side of the pressure cylinder 94. Between the push block 93 and the locking block 95 is a fixed push rod 97. One end of the fixed push rod 97 is rotatably connected to the push block 93, and the other end of the fixed push rod 97 is rotatably connected to the locking block 95. The pressure cylinder 94 has a cavity inside, and a through hole 941 is provided at the top of the cavity. The cavity of the pressure cylinder 94 presses against the upper end of the pressure cover 46, and the lower valve rod 8 passes through the through hole 941. The locking block 95 moves laterally inside the guide frame 52. The locking block 95 has a through slot 951 inside, and inclined slots 952 are provided on both sides of the slot 951. The opening of the slot 952 is at the same height as the first guide wheel 82. The locking block 95 has a second guide wheel 953 rotatably connected to it on the outside. The second guide wheel 953 rotates and is guided in the guide groove 521. When the push block 93 moves away from the lower valve stem 8, the first guide wheel 82 enters the slot 952 as the locking block 95 moves toward the lower valve stem 8. Then, the first guide wheel 82 and the lower valve stem 8 are driven by the slot 952 to rise. The pressure cylinder 94 unlocks and disengages from the pressure cover 46. When the push block 93 approaches the lower valve stem 8, the locking block 95 retracts and moves away. The pressure cylinder 94 presses down on the pressure cover 46. When the elastic push rod 96 retracts to the specified pressure, the push block 93 stops moving.

[0034] Working principle of the invention: When in use, first connect the valve body 1 to the pipeline, using a low-inlet and high-outlet connection method. Then assemble the valve seat 2, valve core 3, valve cover 4, flow equalization cover 7, and lower valve stem 8. Fix the support frame 5 on the upper end of the valve cover 4. The drive actuator module 6 and the manual drive module 9 are fixedly connected to the support frame 5. Then, the sealing gasket 103 is placed in, and the quick-release ring 42 is inserted. The packing base gasket 43, packing 44, and disc spring 45 are placed inside the quick-release ring 42 in sequence from low to high. Then, the pressure cylinder 94 presses on the pressure cover 46. The rotating disc 921 drives the push block 93 to approach the lower valve stem 8. The elastic push rod 96 pushes the pressure cylinder 94 down to press the pressure cover 46. The pressure value of the elastic push rod 96 stops after reaching the specified value. The locking block 95 reaches the farthest distance from the lower valve stem 8. The top of the lower valve stem 8 is inserted into the pull cylinder 62. The first guide post 83 is inserted into the transverse groove of the L-shaped guide groove 621. The locking tongue 623 will lock in the transverse groove. During normal use, the drive actuator module 6 can automatically control the raising and lowering of the upper valve stem 61 according to the program settings or the pressure of the pipeline. The upper valve stem 61 pulls the lower valve stem 8 and valve core 3 to raise and lower synchronously through the pull cylinder 62, thereby controlling the opening and closing of the valve body 1. When the packing 44 needs to be replaced, rotate the turntable 921 to drive the push block 93 away from the lower valve stem 8. The push block 93 moves a distance equal to half the stroke of the push rod 92. The pressure cylinder 94 disengages from the pressure cover 46. Then lift the pressure cylinder 94 and pull out the pressure cover 46. The packing base 43, packing 44, and disc spring 45 can be removed and replaced at once through the quick release ring 42. When the drive actuator module 6 malfunctions or the main body structure needs maintenance, the sealing regulating valve cannot be used normally. The upper valve stem 61, lower valve stem 8, and valve core 3 cannot rise or fall normally. At this time, it is necessary to manually or disassemble the main body structure, pull up the pressure ring 622 and locking tongue 623, rotate the pull cylinder 62 to rotate the first guide column 83 into the vertical groove of the L-shaped guide groove 621, release the pressure ring 622, rotate the turntable 921, push the block 93 away from the lower valve stem 8, and move the locking block 95 toward the lower valve stem 8. The first guide wheel 82 enters the locking groove 952, and then the first guide wheel 82, lower valve stem 8, and valve core 3 are driven by the locking groove 952 to rise and unlock the main body structure. After the push block 93 moves to the maximum value of the push rod 92 stroke, the entire lower valve stem 8 and valve core 3 are pulled up.

[0035] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A sealing regulating valve suitable for high-temperature operating conditions, the sealing regulating valve comprising a body structure and a drive structure, characterized in that: The main body structure includes a valve body (1), a valve seat (2), a valve core (3), a valve cover (4), a flow equalization shield (7), and a lower valve stem (8). The drive structure includes a support frame (5), a drive actuator module (6), and a manual drive module (9). The valve body (1) is provided with a valve seat (2) inside, and a valve seat gasket (101) is provided between the two. A liftable valve core (3) is provided at the center of the valve seat (2). A flow equalization shroud (7) is fitted on the outside of the valve core (3). A lower valve rod (8) is provided inside the valve core (3). A valve core cover (31) is fixedly connected at the contact position between the valve core (3) and the flow equalization shroud (7). A metal sealing ring (32) is provided below the valve core cover (31). The bottom end of the lower valve rod (8) is fixedly connected to the center of the valve core (3). A valve cover (4) is fixedly connected to the top of the valve body (1) by fasteners. A valve cover gasket (102) is provided at the sealing position between the valve cover (4) and the flow equalization shroud (7) and the top of the valve body (1). The valve cover (4) is provided with a quick-release valve cover sealing structure at the top center. The valve cover sealing structure includes a quick-release ring (42), a packing base (43), a packing (44), a disc spring (45), and a pressure cap (46). The packing base (43), the packing (44), and the disc spring (45) are placed inside the quick-release ring (42) in order from low to high, and then pressed by the pressure cap (46). A sealing gasket (103) is provided between the quick-release ring (42) and the valve cover (4). The bottom end of the support frame (5) is fixedly connected to the valve cover (4) by fasteners. The drive actuator module (6) is fixed on the top of the support frame (5). The manual drive module (9) is fixed on the side of the support frame (5). The drive actuator module (6) includes a liftable upper valve rod (61). The bottom end of the upper valve rod (61) is provided with a rotatably connected pull cylinder (62). The top end of the lower valve rod (8) is inserted into the cavity inside the pull cylinder (62). The manual drive module (9) includes a horizontally moving push block (93), a locking block (95), and a vertically moving pressure cylinder (94). The pressure cylinder (94) presses against the pressure cap (46). When the push block (93) moves away from the lower valve stem (8), the locking block (95) can pull the lower valve stem (8) up, and the pressure cylinder (94) moves away from the pressure cap (46). When the push block (93) approaches the lower valve stem (8), the locking block (95) moves away, and the pressure cylinder (94) presses against the pressure cap (46).

2. A sealing regulating valve suitable for high-temperature operating conditions according to claim 1, characterized in that: The valve seat (2) is made of cobalt-based hard alloy, and hard alloy (21) is welded onto the surface of the valve seat (2). The bottom outer edge of the valve core (3) has a chamfer.

3. A sealing regulating valve suitable for high-temperature operating conditions according to claim 1, characterized in that: The metal sealing ring (32) is made of Inconel 718 precipitation-hardening nickel-chromium-iron alloy.

4. A sealing regulating valve suitable for high-temperature operating conditions according to claim 1, characterized in that: The lower valve stem (8) drives the valve core (3) to move up and down synchronously. The lower half of the lower valve stem (8) is provided with a guide strip (81) on the side. The upper half of the lower valve stem (8) is provided with a first guide wheel (82) that is rotatably connected. The top side of the lower valve stem (8) is provided with a first guide post (83) that is fixedly connected. The bottom of the flow equalization shroud (7) is pressed on the valve seat (2). The valve cover (4) presses against the flow equalization shroud (7) and the top of the valve body (1). The valve cover (4) is provided with an internal valve guide block (41). The guide strip (81) slides along the internal valve guide block (41) in a directional manner.

5. A sealing regulating valve suitable for high-temperature operating conditions according to claim 1, characterized in that: The disc spring (45) compensates for the thermal expansion difference between the valve stem (8) and the valve cover (4) by elastic deformation. The packing (44) adopts double-layer flexible graphite packing, and the gland (46) is pre-tightened with constant force.

6. A sealing regulating valve suitable for high-temperature operating conditions according to claim 1, characterized in that: The support frame (5) is provided with a fixedly connected scale (51) and guide frame (52). The guide frame (52) is provided with a through guide groove (521). The upper valve rod (61) is provided with a fixedly connected pointer (611) on its side. When the upper valve rod (61) moves, the pointer (611) changes the reading on the scale (51).

7. A sealing regulating valve suitable for high-temperature operating conditions according to claim 1, characterized in that: The pull cylinder (62) has a cavity inside, and an axially arranged L-shaped guide groove (621) is provided on the side of the cavity. The L-shaped guide groove (621) is divided into a vertical groove and a horizontal groove. The pull cylinder (62) has a slidingly fitted pressure ring (622) and a fixedly connected locking groove (624) on the outside. A spring is provided between the pressure ring (622) and the top of the pull cylinder (62). The pressure ring (622) has an axially arranged locking tongue (623). The number of locking grooves (624) is the same as the number of locking tongues (623). The first guide post (83) is inserted into the horizontal groove of the L-shaped guide groove (621). The locking tongue (623) will be locked in the horizontal groove. The upper valve rod (61) pulls the lower valve rod (8) synchronously up and down through the pull cylinder (62).

8. A sealing regulating valve suitable for high-temperature operating conditions according to claim 1, characterized in that: The manual drive module (9) includes a mounting bracket (91), inside which is a threaded push rod (92). One end of the push rod (92) is fixedly connected to a turntable (921), and the other end of the push rod (92) is provided with a push block (93). When the push rod (92) rotates and moves, it drives the push block (93) to move laterally in sync. Above the push block (93) is a movable locking block (95), and below the push block (93) is a pressure cylinder (94). Between the push block (93) and the pressure cylinder (94) is an elastic push rod (96). Inside the elastic push rod (96) is a pressure container and a pressure sensor. When the elastic push rod (96) changes its extension and retraction length, the pressure sensor changes the pressure value in real time. Between the push block (93) and the locking block (95) is a fixed push rod (97).

9. A sealing regulating valve suitable for high-temperature operating conditions according to claim 8, characterized in that: The pressure cylinder (94) has a cavity inside, and a through hole (941) is provided at the top of the cavity. The cavity of the pressure cylinder (94) presses against the upper end of the pressure cap (46), and the lower valve rod (8) passes through the through hole (941).

10. A sealing regulating valve suitable for high-temperature operating conditions according to claim 9, characterized in that: The card block (95) moves laterally inside the guide frame (52). The card block (95) has a through slot (951) inside. The slot (951) has inclined slots (952) on both sides. The opening of the slot (952) is at the same height as the first guide wheel (82). The card block (95) has a second guide wheel (953) rotatably connected to the outside of the card block (95). The second guide wheel (953) rotates and is guided in the guide groove (521).

Images