High-pressure regulating valve with excellent sealing performance

Abstract

The utility model discloses a high-pressure regulating valve with excellent sealing performance, which belongs to the technical field of high-pressure air supply regulation and comprises a valve body, a sealing component, a valve cage, a valve component, a filler component, a sealing heat dissipation component and an execution component are mounted on the valve body, and the valve component for controlling fluid circulation is mounted at the lower end of the execution component. The sealing assembly, the valve cage, the valve assembly, the packing assembly and the sealing heat dissipation assembly are located on the inner side of the valve body. The valve cage comprises a valve cage bottom piece, a plurality of valve cage middle pieces, a valve cage upper cover and a valve cage gland. By means of the mode, through the arrangement of the valve cage middle piece, fluid scouring and cavitation erosion are relieved, and the service life of equipment is prolonged; through the arrangement of the inclined surface of the self-sealing ring and the elastic strain groove, the sealing effect of the self-sealing ring can be improved when the stuffing box receives pressure, and leakage of fluid is avoided; through the arrangement of the filler box, the filler gasket, the filler and the filler pressing sleeve, the heat transfer efficiency is improved, and the heat dissipation effect is improved through the cooperation of the cooling fins.

Description

Technical Field

[0001] The utility model relates to the technical field of high-pressure gas supply regulation, in particular to a high-pressure regulating valve with excellent sealing performance. Background Art

[0002] The steam turbine high-pressure gas supply station is an important facility that provides high-pressure gas to the steam turbine. In order to ensure that the gas pressure entering the steam turbine is within the safe and designed operating range, a high-pressure regulating valve is usually used to control the gas flow and pressure, which is crucial to improving the efficiency of the equipment and protecting the system.

[0003] For example, Chinese patent application CN115823265A discloses an electric high-pressure water supply regulating valve, including a valve body, the transmission rod is rotatably mounted on the valve cover, the valve sleeve seat is threadedly mounted on the threaded rod, the bottom of the valve sleeve seat is fixedly mounted with a valve core by a fixing screw, the upper surface of the valve body is fixedly connected with a fixed disk, the valve cover is fixedly mounted on the fixed disk by a fixing screw, a transmission mechanism is provided on the valve cover, the driving mechanism includes a transmission rod, the transmission rod is rotatably mounted on the valve cover, the lower end of the transmission rod is fixedly connected with a first mounting disk, the first mounting disk is fixedly mounted with a second mounting disk by a threaded column and a locking nut, the bottom of the second mounting disk is fixedly connected with a threaded rod, the valve sleeve seat is threadedly mounted on the threaded rod, the valve core is fixedly mounted on the bottom of the valve sleeve seat by a fixing screw, and the surface of the valve sleeve seat is in contact with the inner wall of the valve body.

[0004] However, when the electric high-pressure water supply regulating valve is used, the scouring and cavitation of the valve core by the fluid in a high-pressure environment will cause damage to the valve core, reducing the service life of the valve. In addition, the sealing effect is poor, the structure is too simple, and the heat dissipation effect is poor.

[0005] Based on this, the utility model designs a high-pressure regulating valve with excellent sealing performance to solve the above problems. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the prior art, the utility model provides a high-pressure regulating valve with excellent sealing performance.

[0007] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A high-pressure regulating valve with excellent sealing performance, comprising a valve body,

[0009] The valve body is equipped with a sealing assembly for sealing, a valve cage for reducing pressure, a valve assembly for controlling fluid flow, a packing assembly for supporting and fixing, a sealing and heat dissipation assembly for sealing and heat dissipation, and an actuator for controlling operation. The valve assembly for controlling fluid flow is installed at the lower end of the actuator. The sealing assembly, valve cage, valve assembly, packing assembly and sealing and heat dissipation assembly are located inside the valve body. The upper end of the sealing assembly is connected to the valve cage and the valve assembly. The valve cage is located outside the lower end of the valve assembly. The packing assembly is located outside the upper end of the valve assembly. The sealing and heat dissipation assembly is connected to the packing assembly. An air inlet and an air outlet are provided on the inside of the valve body.

[0010] The valve cage includes a valve cage bottom plate, multiple valve cage middle plates, a valve cage upper cover and a valve cage pressure cover. The valve cage bottom plate is installed on the upper end of the sealing assembly. Multiple valve cage middle plates are stacked and fixedly installed on the upper end of the valve cage bottom plate in sequence. The upper end of the topmost valve cage middle plate is fixedly installed with a valve cage upper cover. The inner side of the valve cage middle plate is connected to the valve assembly, the outer side of the valve cage upper cover is in contact with the inner wall of the valve body, the upper end of the valve cage upper cover is fixedly connected to the valve cage pressure cover, the valve cage pressure cover is fixedly connected to the valve body, and the upper end of the valve cage pressure cover is connected to the packing assembly.

[0011] Furthermore, a plurality of concentric annular grooves are formed on the inner side of the middle plate of the cage, and two adjacent annular grooves are connected via radial grooves, and the radial grooves of the outer ring and the inner ring are respectively connected to the air inlet and the air outlet.

[0012] Furthermore, the sealing assembly includes a valve seat self-sealing ring and a valve seat. The valve seat is abuttingly connected and arranged at the inner air outlet of the valve body. The valve seat self-sealing ring is embedded in the connection between the lower end of the valve seat and the valve body. The upper end of the valve seat is fixedly connected to the valve cage bottom plate, and the inner side of the valve seat is connected to the valve assembly.

[0013] Furthermore, the outer side of the lower end of the valve seat is inclined, the outer diameter of the valve seat gradually decreases from top to bottom, and the valve seat is inclined from the inner side of the sealing ring to match the inclined surface of the valve seat.

[0014] Furthermore, the valve assembly includes a valve disc, a valve stem and a nut. The lower end of the valve stem passes through the upper end of the valve disc. The lower end of the valve stem is provided with a thread for use with the nut. The nut is located at the top inside the valve disc and is threadedly connected to the valve stem to fix the valve disc and the valve stem. The lower end of the valve disc is in contact with the valve seat self-sealing ring, the outer side of the valve disc is in contact with the middle piece of the valve cage, and the upper end of the valve stem is connected to the packing assembly and the actuator assembly.

[0015] Furthermore, the packing assembly includes a stuffing box, a packing gasket, a packing, a packing pressure plate seat, a packing pressure sleeve, a packing pressure plate and a plurality of first bolts, the lower end of the stuffing box is disc-shaped, the upper end of the stuffing box is cylindrical, the outer side of the lower end of the stuffing box is in contact with the valve body, the lower end of the stuffing box is in friction with the valve cage pressure cover, the outer side of the stuffing box is connected to the sealing and heat dissipation component, the inner side of the stuffing box is slidingly connected to the valve stem, the packing gasket and the packing are embedded between the inner side of the upper end of the stuffing box and the valve stem from bottom to top, the outer side of the upper end of the stuffing box is fixedly connected to the packing pressure plate seat, the packing pressure plate seat sleeve is arranged on the outer side of the valve stem, the upper end of the packing pressure plate seat is in friction with the packing pressure plate, the lower end of the packing pressure plate seat is in friction with the packing, the packing pressure plate seat and the packing pressure plate are fixedly connected by a plurality of first bolts, the lower end of the packing pressure plate seat is connected to the sealing and heat dissipation component, and the inner side of the packing pressure plate is in contact with the valve stem.

[0016] Furthermore, the sealing and heat dissipation assembly includes a self-sealing ring, six open rings, a heat sink, a second bolt and a cover plate. The self-sealing ring is embedded between the lower end of the stuffing box and the valve body. The upper end of the self-sealing ring is in contact with the six open rings. The inner and outer sides of the six open rings are respectively in contact with the side wall of the lower end of the stuffing box and the inner wall of the valve body. The upper end of the six open rings is in contact with the cover plate. The cover plate and the lower end of the stuffing box are fixedly connected by multiple second bolts. The heat sink is mounted on the outer side of the upper end of the stuffing box, and the upper end of the heat sink is in contact with the stuffing pressure plate seat.

[0017] Furthermore, the inner side of the lower end of the self-sealing ring is inclined, the inner diameter of the self-sealing ring gradually decreases from bottom to top, an elastic strain groove is opened on the outer side of the middle section of the self-sealing ring, the outer side of the lower end of the stuffing box is inclined to match the inclined surface of the self-sealing ring, and multiple groups of disc-shaped heat dissipation plates are arranged on the outer side of the heat sink.

[0018] Furthermore, the actuator assembly includes a bracket and an electric actuator, the bracket is fixedly mounted on the upper end of the valve body, the electric actuator is fixedly mounted on the upper end of the bracket, and the output end of the electric actuator is fixedly connected to the valve stem facing downward.

[0019] Compared with the existing technology, the utility model has the following beneficial effects: 1. The arrangement of the valve cage plate forms a circular flow when the fluid passes through, thereby reducing pressure, slowing down fluid erosion and cavitation, and improving the service life of the equipment;

[0020] 2. The inclined surface of the self-sealing ring and the setting of the elastic strain groove can improve the sealing effect of the self-sealing ring when the stuffing box is under pressure, thus avoiding fluid leakage;

[0021] 3. The heat transfer efficiency is improved by setting the stuffing box, stuffing gasket, stuffing and stuffing sleeve, and the heat dissipation effect is improved by coordinating with the setting of the heat sink. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0023] Figure 1 This is a three-dimensional diagram of a high-pressure regulating valve with excellent sealing performance according to the present utility model;

[0024] Figure 2 This is a front view of a high-pressure regulating valve with excellent sealing performance according to the present utility model;

[0025] Figure 3 This is a left view of a high-pressure regulating valve with excellent sealing performance according to the utility model;

[0026] Figure 4 Along Figure 3 A three-dimensional image with a portion cut away in the AA direction;

[0027] Figure 5 Figure 4 Enlarged view of point B in the middle;

[0028] Figure 6 A three-dimensional diagram of the middle piece of the cage of the present invention.

[0029] The numbers in the figure represent:

[0030] 1. Valve body; 2. Sealing assembly; 21. Valve seat self-sealing ring; 22. Valve seat; 3. Valve cage; 31. Valve cage bottom plate; 32. Valve cage middle plate; 33. Valve cage upper cover; 34. Valve cage gland; 4. Valve assembly; 41. Valve disc; 42. Valve stem; 43. Nut; 5. Packing assembly; 51. Stuffing box; 52. Packing gasket; 53. Packing; 54. Packing pressure plate seat; 55. Packing sleeve; 56. Packing pressure plate; 57. First bolt; 6. Sealing heat dissipation assembly; 61. Self-sealing ring; 62. Six-open ring; 63. Heat sink; 64. Second bolt; 65. Cover plate; 7. Actuator assembly; 71. Bracket; 72. Electric actuator DETAILED DESCRIPTION

[0031] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0032] The terms “left,” “right,” “front,” “back,” “up,” and “down” mentioned in the following description are oriented in the viewing direction of the front view.

[0033] Example 1: In some embodiments, please refer to the accompanying drawings of the specification. Figures 1-6 , a high-pressure regulating valve with excellent sealing performance, comprising a valve body 1,

[0034] The valve body 1 is equipped with a sealing assembly 2 for sealing, a cage 3 for reducing pressure, a valve assembly 4 for controlling fluid circulation, a packing assembly 5 for supporting and fixing, a sealing and heat dissipation assembly 6 for sealing and heat dissipation, and an actuator 7 for controlling operation. The valve assembly 4 for controlling fluid circulation is installed at the lower end of the actuator 7. The sealing assembly 2, the cage 3, the valve assembly 4, the packing assembly 5 and the sealing and heat dissipation assembly 6 are located on the inner side of the valve body 1. The upper end of the sealing assembly 2 is connected to the cage 3 and the valve assembly 4. The cage 3 is located on the outer side of the lower end of the valve assembly 4. The packing assembly 5 is located on the outer side of the upper end of the valve assembly 4. The sealing and heat dissipation assembly 6 is connected to the packing assembly 5. An air inlet and an air outlet are opened on the inner side of the valve body 1.

[0035] The valve cage 3 includes a valve cage bottom plate 31, multiple valve cage middle plates 32, a valve cage upper cover 33 and a valve cage pressure cover 34. The valve cage bottom plate 31 is installed on the upper end of the sealing assembly 2. Multiple valve cage middle plates 32 are stacked and fixedly installed on the upper end of the valve cage bottom plate 31 in sequence. The upper end of the top valve cage middle plate 32 is fixedly installed with a valve cage upper cover 33. The inner side of the valve cage middle plate 32 is connected to the valve assembly 4. The outer side of the valve cage upper cover 33 is in contact with the inner wall of the valve body 1. The upper end of the valve cage upper cover 33 is fixedly connected to the valve cage pressure cover 34. The valve cage pressure cover 34 is fixedly connected to the valve body 1. The upper end of the valve cage pressure cover 34 is connected to the packing assembly 5.

[0036] When the high-pressure regulating valve with excellent sealing performance is in normal use, the fluid enters through the air inlet of the valve body 1 and contacts the outer side of the valve cage middle piece 32, starting the actuator 7, and the actuator 7 drives the valve assembly 4 to operate and open. The fluid enters the inner side of the valve cage middle piece 32 through the valve cage middle piece 32 and flows out along the air outlet of the valve body 1. The fluid that leaks into the space between the valve assembly 4 and the packing assembly 5 is driven to move upward when the valve assembly 4 is in operation, exerting pressure on the packing assembly 5. The packing assembly 5 exerts pressure on the sealing heat dissipation assembly 6 to enhance the sealing effect. The generated heat is guided to the sealing heat dissipation assembly 6 through the packing assembly 5 and discharged. The arrangement of the valve cage middle piece 32 allows the fluid to form a circular flow when passing through, thereby reducing the pressure, slowing down the fluid scouring and cavitation, and improving the service life of the equipment.

[0037] Embodiment 2: In some embodiments, as Figure 4 、 Figure 5 and Figure 6As shown in FIG. 1 , as a preferred embodiment of the present invention, a plurality of concentric annular grooves are provided on the inner side of the cage middle plate 32 , and two adjacent annular grooves are connected by radial grooves, and the radial grooves of the outer ring and the inner ring are connected to the air inlet and the air outlet respectively.

[0038] The sealing assembly 2 includes a valve seat self-sealing ring 21 and a valve seat 22. The valve seat 22 is arranged at the inner air outlet of the valve body 1 in a contact connection. The valve seat self-sealing ring 21 is embedded in the connection between the lower end of the valve seat 22 and the valve body 1. The upper end of the valve seat 22 is fixedly connected to the valve cage bottom plate 31, and the inner side of the valve seat 22 is connected to the valve assembly 4.

[0039] The outer side of the lower end of the valve seat 22 is inclined, and the outer diameter of the valve seat 22 gradually decreases from top to bottom. The valve seat is inclined from the inner side of the sealing ring 21 to match the inclined surface of the valve seat 22.

[0040] The valve assembly 4 includes a valve disc 41, a valve stem 42 and a nut 43. The lower end of the valve stem 42 passes through the upper end of the valve disc 41. The lower end of the valve stem 42 is provided with a thread for matching with the nut 43. The nut 43 is located at the top inside the valve disc 41 and is threadedly connected to the valve stem 42 to fix the valve disc 41 and the valve stem 42. The lower end of the valve disc 41 is in contact with the valve seat self-sealing ring 21, the outer side of the valve disc 41 is in contact with the valve cage middle piece 32, and the upper end of the valve stem 42 is connected to the packing assembly 5 and the actuator assembly 7.

[0041] The packing assembly 5 includes a packing box 51, a packing gasket 52, a packing 53, a packing pressure plate seat 54, a packing sleeve 55, a packing pressure plate 56 and a plurality of first bolts 57. The lower end of the stuffing box 51 is disc-shaped, the upper end of the stuffing box 51 is cylindrical, the outer side of the lower end of the stuffing box 51 is in contact with the valve body 1, the lower end of the stuffing box 51 is in contact with the valve cage cover 34, the outer side of the stuffing box 51 is connected to the sealing and heat dissipation component 6, the inner side of the stuffing box 51 is in sliding connection with the valve stem 42, and the packing gasket 52 and the packing 53 are connected from bottom to The upper portion is embedded between the inner side of the upper end of the stuffing box 51 and the valve stem 42 in sequence. The outer side of the upper end of the stuffing box 51 is fixedly connected to the stuffing pressure plate seat 54. The stuffing pressure plate seat 54 is sleeved on the outer side of the valve stem 42. The upper end of the stuffing pressure plate seat 54 is in contact with the stuffing pressure plate 56. The lower end of the stuffing pressure plate seat 54 is in contact with the stuffing 53. The stuffing pressure plate seat 54 and the stuffing pressure plate 56 are fixedly connected by multiple first bolts 57. The lower end of the stuffing pressure plate seat 54 is connected to the sealing and heat dissipation assembly 6. The inner side of the stuffing pressure plate 56 is in contact with the valve stem 42.

[0042] The sealing and heat dissipation assembly 6 includes a self-sealing ring 61, six open rings 62, a heat sink 63, a second bolt 64 and a cover plate 65. The self-sealing ring 61 is embedded between the lower end of the stuffing box 51 and the valve body 1. The upper end of the self-sealing ring 61 is in contact with the six open rings 62. The inner and outer sides of the six open rings 62 are in contact with the side wall of the lower end of the stuffing box 51 and the inner side wall of the valve body 1 respectively. The upper end of the six open rings 62 is in contact with the cover plate 65. The cover plate 65 and the lower end of the stuffing box 51 are fixedly connected by multiple second bolts 64. The heat sink 63 is sleeved on the outer side of the upper end of the stuffing box 51, and the upper end of the heat sink 63 is in contact with the stuffing pressure plate seat 54.

[0043] The inner side of the lower end of the self-sealing ring 61 is tilted, and the inner diameter of the self-sealing ring 61 gradually decreases from bottom to top. An elastic strain groove is opened on the outer side of the middle section of the self-sealing ring 61. The outer side of the lower end of the stuffing box 51 is tilted to match the inclined surface of the self-sealing ring 61, and multiple groups of disc-shaped heat dissipation plates are set on the outer side of the heat sink 63.

[0044] The actuator assembly 7 includes a bracket 71 and an electric actuator 72. The bracket 71 is fixedly mounted on the upper end of the valve body 1. The electric actuator 72 is fixedly mounted on the upper end of the bracket 71. The output end of the electric actuator 72 is fixedly connected to the valve stem 42 downward.

[0045] When the high-pressure regulating valve with excellent sealing performance is in normal use, the fluid enters through the air inlet of the valve body 1 and contacts the valve cage middle piece 32 and is blocked by the valve disc 41 when passing through the valve cage middle piece 32. The electric actuator 72 is started, and the electric actuator 72 drives the valve stem 42 to move upward. The valve stem 42 drives the valve disc 41 to move upward. The valve disc 41 no longer blocks the fluid, and the fluid enters the inner side of the valve cage middle piece 32 through the valve cage middle piece 32 and flows out through the air outlet of the valve body 1. The fluid that leaks between the valve disc 41 and the stuffing box 51 is driven to move upward when the valve disc 41 moves upward. The fluid applies pressure to the stuffing box 51, and the stuffing box 51 applies pressure to the self-sealing ring 61. The inclined surface between the stuffing box 51 and the self-sealing ring 61 is set so that part of the pressure is dispersed to the outside. The outward force causes the self-sealing ring 61 to deform and fit more closely with the valve body 1 and the stuffing box 51. The generated heat is conducted upward along the stuffing box 51, and when it is conducted to the heat sink 63, it is discharged through multiple heat sinks outside the heat sink 63. The stuffing box 51, the stuffing gasket 52, the stuffing 53, and the stuffing sleeve 55 accelerate heat conduction and support the valve stem 42. The stuffing pressure plate seat 54 and the stuffing pressure plate 56 are used for fixing. The inclined surface of the self-sealing ring 61 and the elastic strain groove are set, so that the stuffing box 51 can improve the sealing effect of the self-sealing ring 61 when it receives pressure, thereby avoiding fluid leakage. The setting of the stuffing box 51, the stuffing gasket 52, the stuffing 53, and the stuffing sleeve 55 improves the heat transfer efficiency, and the setting of the heat sink 63 improves the heat dissipation effect.

[0046] Embodiment 3: In some embodiments, as Figures 1-6 As shown, as a preferred embodiment of the present invention, a method for using a high-pressure regulating valve with excellent sealing performance includes the following steps:

[0047] Step 1: The fluid enters through the air inlet of the valve body 1 and contacts the cage middle piece 32 and is blocked by the valve disc 41 when passing through the cage middle piece 32;

[0048] Step 2: Start the electric actuator 72, which drives the valve stem 42 to move upward. The valve stem 42 drives the valve disc 41 to move upward. The valve disc 41 no longer blocks the fluid. The fluid enters the inner side of the cage middle piece 32 through the cage middle piece 32 and flows out through the air outlet of the valve body 1.

[0049] Step 3: The fluid leaking between the valve disc 41 and the stuffing box 51 is driven upward when the valve disc 41 moves upward. The fluid exerts pressure on the stuffing box 51, and the stuffing box 51 exerts pressure on the self-sealing ring 61. The inclined surface between the stuffing box 51 and the self-sealing ring 61 disperses part of the pressure outward. The outward force causes the self-sealing ring 61 to deform and fit more tightly against the valve body 1 and the stuffing box 51.

[0050] Step 4: The generated heat is conducted upward along the stuffing box 51, and when it is conducted to the heat sink 63, it is discharged through multiple heat sinks outside the heat sink 63. The stuffing box 51, stuffing gasket 52, stuffing 53, and stuffing sleeve 55 accelerate heat conduction and support the valve stem 42. The stuffing pressure plate seat 54 and the stuffing pressure plate 56 are used for fixing.

[0051] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A high-pressure regulating valve with excellent sealing performance, comprising a valve body (1), characterized in that: The valve body (1) is provided with a sealing assembly (2) for sealing, a valve cage (3) for reducing pressure, a valve assembly (4) for controlling fluid circulation, a packing assembly (5) for supporting and fixing, a sealing heat dissipation assembly (6) for sealing and heat dissipation, and an actuator (7) for controlling operation. The valve assembly (4) for controlling fluid circulation is provided at the lower end of the actuator (7). The sealing assembly (2), the valve cage (3), the valve assembly (4), the packing assembly (5) and the sealing heat dissipation assembly (6) are located inside the valve body (1). The upper end of the sealing assembly (2) is connected to the valve cage (3) and the valve assembly (4). The valve cage (3) is located outside the lower end of the valve assembly (4). The packing assembly (5) is located outside the upper end of the valve assembly (4). The sealing heat dissipation assembly (6) is connected to the packing assembly (5). An air inlet and an air outlet are provided inside the valve body (1). The valve cage (3) comprises a valve cage bottom plate (31), a plurality of valve cage middle plates (32), a valve cage upper cover (33) and a valve cage pressure cover (34); the valve cage bottom plate (31) is mounted on the upper end of the sealing assembly (2); the plurality of valve cage middle plates (32) are stacked and fixedly mounted on the upper end of the valve cage bottom plate (31); the upper end of the uppermost valve cage middle plate (32) is fixedly mounted with a valve cage upper cover (33); the inner side of the valve cage middle plate (32) is connected to the valve assembly (4); the outer side of the valve cage upper cover (33) is in contact with the inner wall of the valve body (1); the upper end of the valve cage upper cover (33) is fixedly connected to the valve cage pressure cover (34); the valve cage pressure cover (34) is fixedly connected to the valve body (1); and the upper end of the valve cage pressure cover (34) is connected to the packing assembly (5).

2. The high-pressure regulating valve with excellent sealing performance according to claim 1, characterized in that: A plurality of concentric annular grooves are provided on the inner side of the valve cage middle plate (32), and two adjacent annular grooves are connected via radial grooves, and the radial grooves of the outer ring and the inner ring are respectively connected to the air inlet and the air outlet.

3. The high-pressure regulating valve with excellent sealing performance according to claim 2, characterized in that: The sealing assembly (2) includes a valve seat self-sealing ring (21) and a valve seat (22). The valve seat (22) is arranged at the inner air outlet of the valve body (1) in a contact connection. The valve seat self-sealing ring (21) is embedded in the connection between the lower end of the valve seat (22) and the valve body (1). The upper end of the valve seat (22) is fixedly connected to the valve cage bottom plate (31). The inner side of the valve seat (22) is connected to the valve assembly (4).

4. The high-pressure regulating valve with excellent sealing performance according to claim 3, characterized in that: The outer side of the lower end of the valve seat (22) is inclined, the outer diameter of the valve seat (22) gradually decreases from top to bottom, and the valve seat is inclined to match the inclined surface of the valve seat (22) from the inner side of the sealing ring (21).

5. The high-pressure regulating valve with excellent sealing performance according to claim 4, characterized in that: The valve assembly (4) includes a valve disc (41), a valve stem (42) and a nut (43). The lower end of the valve stem (42) passes through the upper end of the valve disc (41). The lower end of the valve stem (42) is provided with a thread for matching with the nut (43). The nut (43) is located at the top of the valve disc (41) and is threadedly connected to the valve stem (42) to fix the valve disc (41) and the valve stem (42). The lower end of the valve disc (41) is in contact with the valve seat self-sealing ring (21), the outer side of the valve disc (41) is in contact with the valve cage middle piece (32), and the upper end of the valve stem (42) is connected to the packing assembly (5) and the actuator assembly (7).

6. The high-pressure regulating valve with excellent sealing performance according to claim 5, characterized in that: The packing assembly (5) includes a packing box (51), a packing gasket (52), a packing (53), a packing pressure plate seat (54), a packing sleeve (55), a packing pressure plate (56) and a plurality of first bolts (57). The lower end of the packing box (51) is disc-shaped, the upper end of the packing box (51) is cylindrical, the outer side of the lower end of the packing box (51) is in contact with the valve body (1), the lower end of the packing box (51) is in contact with the valve cage pressure cover (34), the outer side of the packing box (51) is connected to the sealing heat dissipation assembly (6), the inner side of the packing box (51) is in sliding connection with the valve stem (42), the packing gasket (52) and the packing (53) are ... From bottom to top, the packing box (51) is sequentially embedded between the inner side of the upper end of the packing box (51) and the valve stem (42). The outer side of the upper end of the packing box (51) is fixedly connected to the packing pressure plate seat (54). The packing pressure plate seat (54) is sleeved on the outer side of the valve stem (42). The upper end of the packing pressure plate seat (54) is in contact with the packing pressure plate (56). The lower end of the packing pressure plate seat (54) is in contact with the packing (53). The packing pressure plate seat (54) and the packing pressure plate (56) are fixedly connected by a plurality of first bolts (57). The lower end of the packing pressure plate seat (54) is connected to the sealing heat dissipation component (6). The inner side of the packing pressure plate (56) is in contact with the valve stem (42).

7. The high-pressure regulating valve with excellent sealing performance according to claim 6, characterized in that: The sealing heat dissipation assembly (6) comprises a self-sealing ring (61), six open rings (62), a heat sink (63), a second bolt (64) and a cover plate (65). The self-sealing ring (61) is embedded between the lower end of the stuffing box (51) and the valve body (1). The upper end of the self-sealing ring (61) is in contact with the six open rings (62). The inner and outer sides of the six open rings (62) are respectively in contact with the side wall of the lower end of the stuffing box (51) and the inner side wall of the valve body (1). The upper end of the six open rings (62) is in contact with the cover plate (65). The cover plate (65) and the lower end of the stuffing box (51) are fixedly connected by a plurality of second bolts (64). The heat sink (63) is sleeved on the outer side of the upper end of the stuffing box (51). The upper end of the heat sink (63) is in contact with the stuffing pressure plate seat (54).

8. The high-pressure regulating valve with excellent sealing performance according to claim 7, characterized in that: The inner side of the lower end of the self-sealing ring (61) is inclined, and the inner diameter of the self-sealing ring (61) gradually decreases from bottom to top. An elastic strain groove is provided on the outer side of the middle section of the self-sealing ring (61). The outer side of the lower end of the stuffing box (51) is inclined to match the inclined surface of the self-sealing ring (61). Multiple groups of disc-shaped heat dissipation plates are provided on the outer side of the heat sink (63).

9. The high-pressure regulating valve with excellent sealing performance according to claim 8, characterized in that: The actuator assembly (7) comprises a bracket (71) and an electric actuator (72), wherein the bracket (71) is fixedly mounted on the upper end of the valve body (1), and the electric actuator (72) is fixedly mounted on the upper end of the bracket (71), and the output end of the electric actuator (72) is fixedly connected to the valve stem (42) facing downward.

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