Angle type labyrinth sleeve adjusting valve suitable for high pressure and various medium states

Abstract

The invention relates to an angle type labyrinth sleeve adjusting valve structure suitable for high pressure and various medium states. Most of the existing multi-stage pressure reducing valves adopt a structure that a regulating valve is connected in series with a multi-stage throttling orifice plate, the regulating precision of the valves is not ideal basically, and the regulating range is usually small. The labyrinth disc assembly is installed on a valve seat, the sleeve is placed downwards along the inner wall of the labyrinth disc assembly, the inner wall of the lower end of the sleeve is matched with the outer wall of the upper end of the valve seat, the sleeve compresses the upper plane of the labyrinth disc assembly, and a valve rod is screwed into a thread at the upper end of a valve element assembly. The small holes distributed in the side wall of the sleeve are divided into three layers, the lowermost layer is dense holes, the middle layer is sparse holes, and the uppermost layer is large holes. The purpose of pressure reduction can be achieved through step-by-step pressure reduction, the opening degree of the valve is adjusted in one valve, the overall adjusting precision of the valve is improved, the adjustable range of the valve is widened, and good sealing performance is achieved.

Description

Technical Field

[0001] This invention relates to the field of fluid control equipment technology, specifically to an angle labyrinth sleeve regulating valve structure suitable for high pressure and various media conditions. Background Technology

[0002] As a crucial component for pressure and flow control in thermal power plants, regulating valves are increasingly important due to the continuous development of the market and the ongoing improvements in the processes of thermal power plants. This has led to a growing demand for fluids with high pressure and temperature parameters, multiple operating conditions, and diverse media.

[0003] For high-pressure operating conditions, conventional valves often employ a multi-stage orifice plate structure in series with a regulating valve. The orifice plate works in conjunction with the regulating valve to achieve pressure reduction. However, this design typically only regulates a single operating condition, and its flow characteristic curve often exhibits a non-linear distribution within the 30% to 70% opening range. If the user adjusts the operating conditions, the valve often experiences adjustment errors and parameter unadjustability due to the non-adjustability of the orifice plate.

[0004] If a valve core and sleeve structure is used alone to regulate operating parameters, traditional control valves (such as single-seat control valves, sleeve control valves, and V-ball valves) often experience cavitation and erosion at the sealing surface when the pressure difference across the valve exceeds 5 MPa. This damages and causes material loss at the sealing surface, affecting the overall service life of the valve. Especially for high-pressure liquid media, the valve's throttling effect often leads to a sharp increase in flow velocity, causing the downstream pressure to fall below the fluid's saturated vapor pressure. The liquid will then flash vapor due to the sudden pressure drop, creating a two-phase flow. If the bubbles in this two-phase flow burst, the kinetic energy generated in a very short time will impact the metal surfaces of the valve core, seat, and body, damaging them. Ultimately, this results in a leaky seal, valve body damage, or leakage, requiring the valve to be scrapped or shut down for repair.

[0005] Meanwhile, most control valves on the market are only designed to regulate fluids in a single state (such as liquid and gas). If the state of the medium changes, such as from gas to liquid, saturated, or two-phase flow, conventional control valves will be difficult to use, and in severe cases, they may even damage the valve core, valve seat, and other sealing components.

[0006] The existing technology has the following problems: 1. The problem of regulating valve precision caused by high pressure parameters: Most existing multi-stage pressure reducing valves adopt a multi-stage orifice plate structure with regulating valves in series. Due to the non-adjustability of the orifice plate, the regulating precision of the valve is generally not ideal, the regulating range is often small, and it is difficult to achieve precise regulation of working conditions and use multiple working conditions.

[0007] 2. Problems such as excessive medium flow rate, excessive kinetic energy, and cavitation caused by excessive pressure drop of valve: Although single-stage pressure reduction of conventional valves can improve the regulation accuracy, it will also cause problems such as excessive medium flow rate and excessive kinetic energy due to excessive pressure drop of valve. If the medium is liquid, it will also cause impact on the valve itself due to flashing and cavitation.

[0008] 3. How to achieve multi-condition regulation using a single valve for fluids in various media states: Existing valve designs are mostly designed for fluids in a single media state. If the fluid state changes, the original valve often becomes difficult to regulate. In particular, when the media state changes from gaseous to liquid, the valve often experiences cavitation due to excessive pressure drop at a single liquid stage. Summary of the Invention

[0009] To address the problems existing in the prior art, this invention provides an angle labyrinth sleeve regulating valve structure suitable for high pressure and various media conditions. It can achieve pressure reduction by gradually reducing pressure, allowing the valve opening adjustment to be achieved within a single valve, thereby improving the overall regulating accuracy and adjustable range of the valve, and providing good sealing performance.

[0010] The present invention adopts the following technical solution: an angle labyrinth sleeve regulating valve suitable for high pressure and various media states, comprising a valve body, a valve seat, a valve stem, a valve core assembly, a labyrinth disc assembly, and a sleeve, characterized in that the labyrinth disc assembly is installed on the valve seat, the sleeve is placed downward along the inner wall of the labyrinth disc assembly, the lower inner wall of the sleeve mates with the upper outer wall of the valve seat, the sleeve presses against the upper plane of the labyrinth disc assembly, the valve stem is screwed into the upper thread of the valve core assembly, so that the two form an assembly that is installed into the valve along the inner wall of the sleeve, and the small holes distributed on the side wall of the sleeve are divided into 3 layers, the bottom layer is dense holes, the middle layer is sparse holes, and the top layer is large holes.

[0011] Preferably, the valve seat is a cage-type valve seat, and the valve seat is located at the valve outlet.

[0012] Preferably, the lower end of the valve seat is provided with a valve cage, and the surface of the valve cage has small holes.

[0013] Preferably, a metal C-ring is provided within the sealing groove of the valve core assembly. This metal C-ring is composed of an open circular shell with a hollow energy storage cavity inside. This invention innovatively introduces a metal elastic sealing ring with a "C"-shaped cross-section, and uses a valve core gland to axially limit its movement to prevent rolling. This unique structure allows it to generate a uniform and continuous elastic rebound force like a spring when axially compressed.

[0014] Preferably, the base material of the C-ring is made of a nickel-based high-temperature alloy, Inconel 718. This material has excellent high-temperature strength, creep resistance, and relaxation resistance, ensuring that the sealing ring maintains its mechanical properties and elasticity even under extreme high-temperature conditions far exceeding 250°C (e.g., up to 550°C or even higher).

[0015] Preferably, the C-ring has a silver-plated layer on the outside of the base material. This innovatively abandons the non-metallic materials indispensable in traditional Class V seals, employing an all-metallic material system of "nickel-based high-temperature alloy (such as Inconel 718) as the C-ring base + metallic silver (Ag) as the surface plating." This material combination achieves a synergistic effect: the Inconel 718 base ensures that the sealing ring maintains excellent mechanical strength and elastic resilience at temperatures of 550°C and even higher, providing a "rigid skeleton" for the seal; while the surface silver plating acts as a soft, solid filling medium, perfectly conforming to the sealing surface at the microscopic level, achieving an initial sealing effect of "softness overcoming rigidity."

[0016] Preferably, the maze disc assembly is composed of multiple sets of stacked maze unit components, with spacer discs between adjacent maze unit components, and positioning holes provided on each maze unit component, with cylindrical pins passing through the positioning holes.

[0017] Preferably, the maze unit component includes an inner disc, and outer discs are respectively provided on the upper and lower surfaces of the inner disc, with different flow channel structures designed for the inner and outer discs.

[0018] Preferably, a first metal spiral wound gasket is included, which is placed at the bottom seal of the valve body, and the valve seat presses the first metal spiral wound gasket.

[0019] Preferably, a second metal spiral wound pad is provided on the upper surface of the sleeve, and the second metal spiral wound pad is pressed by a compensation block. A third metal spiral wound pad is then installed on the upper surface of the compensation block.

[0020] Preferably, a valve cover is provided on the third metal spiral wound pad, and the valve body and the valve cover are connected by bolt fasteners.

[0021] The beneficial effects of this invention are as follows: 1. Suitable for high pressure differential media: The valve adopts a labyrinth disc structure design. The complex flow channel design of the disc ensures a high pressure drop while gradually reducing the pressure of the fluid, effectively reducing the cavitation and cavitation problems caused by single-stage pressure reduction in traditional control valves.

[0022] 2. Applicable to various fluid media: The multi-layered arrangement of the labyrinth discs and the corresponding orifice distribution on the sleeve allow the valve to adjust for various fluid conditions, meeting diverse on-site user needs. Simultaneously, the continuity of the sleeve orifices ensures the continuity of valve operation, enabling the valve to adjust for multiple conditions. This design improves the valve's applicability and adjustment accuracy.

[0023] 3. Reduce damage to the valve body from cavitation conditions: The cage-like structure of the valve seat protects the valve body while reducing the generation of fluid turbulence. It also ensures that the parts directly eroded by bubbles generated by flash evaporation of the liquid medium are the valve seat, rather than other internal components of the valve. The valve seat has lower processing costs and is easier to replace. This extends the overall service life of the control valve and provides convenience for subsequent maintenance and repair.

[0024] 4. The elastic deformation of the metal C-ring and the surface sealing effect of the silver plating layer can stably control the leakage level of the control valve to Class V or higher throughout the entire operating temperature range, filling the performance gap between high temperature and ultra-low leakage in existing technologies.

[0025] illustrate Figure 1 This is a valve assembly diagram of the present invention.

[0026] Figure 2 This is a schematic diagram of a set of maze unit components of the present invention.

[0027] Figure 3 This is a schematic diagram of the structure of the labyrinth disc assembly of the present invention.

[0028] Figure 4 This is a schematic diagram of the disk flow channel of the present invention.

[0029] Figure 5 This is a schematic diagram of the overall structure of the maze disc assembly.

[0030] Figure 6 This is a schematic diagram of the maze sleeve structure.

[0031] Figure 7 This is a schematic diagram of the maze disc assembly and the maze sleeve.

[0032] Figure 8 This is a schematic diagram of a cage-type valve seat.

[0033] Figure 9 This is a schematic diagram of the installation of a metal C-ring.

[0034] In the diagram: 101. Valve body; 102. Valve seat; 103. First spiral wound gasket; 104. Sleeve; 105. Valve core assembly; 106. Second spiral wound gasket; 107. Compensating block; 108. Third spiral wound gasket; 109. Valve cover; 110. Valve stem; 200. Labyrinth disc assembly; 201. Bottom ring of the disc; 202. Top ring of the disc; 203. Outer disc; 204. Inner disc; 205. Spacer disc; 206. Another section of the outer disc; 207. Another section of the inner disc; 208. Cylindrical pin; 300. C-ring. Detailed Implementation

[0035] The present invention will be further described below with reference to specific embodiments.

[0036] like Figure 1 As shown, this invention discloses an angle labyrinth sleeve regulating valve suitable for high pressure and various media states, comprising a valve body 101, a valve seat 102, a valve stem 110, a valve core assembly 105, a labyrinth disc assembly 200, and a sleeve 104. The labyrinth disc assembly 200 is mounted on the valve seat 102. The sleeve 104 is placed downward along the inner wall of the labyrinth disc assembly 200. The lower inner wall of the sleeve 104 mates with the upper outer wall of the valve seat 102. The sleeve 104 presses against the upper plane of the labyrinth disc assembly 200. The valve stem 110 is screwed into the upper thread of the valve core assembly 105, so that the two form an assembly that is installed into the valve along the inner wall of the sleeve 104. The small holes distributed on the side wall of the sleeve are divided into three layers: the bottom layer is densely packed holes, the middle layer is sparsely packed holes, and the top layer is large holes.

[0037] In this embodiment, a multi-layered labyrinth-type disc assembly is used inside the valve to gradually reduce the pressure of the fluid to achieve the purpose of pressure reduction; at the same time, it is combined with a multi-layered perforated sleeve, so that the valve opening adjustment can be achieved in one valve, improving the overall adjustment accuracy and adjustable range of the valve; a cage structure is designed at the valve seat to cope with the impact of high-velocity media after pressure reduction and protect downstream equipment.

[0038] The technical solution of this invention is achieved through the following methods: The flow channel design shape and pressure reduction stages of the labyrinth disc are adjusted to accommodate different parameters and variations. The final labyrinth disc assembly consists of multiple stacked discs with different flow channel structures to adapt to fluids under varying pressure parameters and conditions. The sleeve openings are matched to the labyrinth disc flow channels, and small holes of different sizes and numbers are arranged according to different flow channel designs, with transition areas left between holes to improve the continuous adjustability of the valve and increase its adjustment accuracy. The valve seat is changed from a straight-through structure to a cage-type structure design, with small holes on the inner wall of the cage to disperse the medium into multiple fine streams while withstanding its scouring, thereby reducing the impact of the medium on downstream equipment and improving the overall service life of the equipment.

[0039] 1. Structural features of labyrinth disks: The complex flow channel design of the disks can divide the fluid into multiple thin streams, and reduce the kinetic energy by dividing the single energy into multiple small flow streams; at the same time, the pressure reduction of the fluid in the disks is not achieved all at once, but gradually. The steady pressure reduction can significantly reduce the generation and collapse of bubbles, and reduce the occurrence of cavitation conditions.

[0040] 2. Structural features of the sleeve: The small holes in the sleeve further disperse energy, reducing noise generated when the medium flows through the valve internals. Simultaneously, the transition area between the small holes ensures the continuity of area changes during valve adjustment, allowing flow and pressure regulation to be performed within a single valve, reducing the impact of other components and thus achieving precise flow and pressure regulation.

[0041] 3. Structural Features of the Valve Seat: The cage-like design of the valve seat prevents downstream steam from directly contacting downstream components, instead allowing it to primarily impact the inner wall of the valve seat. The medium then passes through small holes in the valve seat, dispersing the large flow rate into multiple smaller flow rates, reducing direct scouring of subsequent pipelines. Simultaneously, the rectifying effect of the small holes reduces turbulence and vortex generation. Furthermore, the valve seat surface undergoes corresponding hardening treatments, such as nitriding and heat treatment, improving its erosion resistance and service life.

[0042] Specifically, it also includes a first metal spiral wound gasket, the first metal spiral wound gasket 103 is placed at the bottom sealing part of the valve body 101, and the valve seat 102 presses the first metal spiral wound gasket 103.

[0043] Specifically, a second metal spiral wound pad 106 is provided on the upper surface of the sleeve, and the second metal spiral wound pad 106 is pressed by a compensation block 107. A third metal spiral wound pad 108 is then installed on the upper surface of the compensation block 107.

[0044] Specifically, a valve cover is provided on the third metal spiral wound pad 108, and the valve body and the valve cover 109 are connected by bolt fasteners.

[0045] like Figure 2 As shown, the maze disc assembly is composed of multiple stacked maze unit components. The maze discs are divided into three types: inner discs, outer discs, and spacer discs. In use, the maze unit assembly consists of two outer discs, one inner disc, and one spacer disc. Each maze unit component is provided with positioning holes, and cylindrical pins pass through the positioning holes. Outer discs are respectively provided on the upper and lower surfaces of the inner discs, and the flow channel structures of the inner and outer discs are designed differently.

[0046] like Figures 3-5 As shown, the assembly steps for the maze disc assembly are as follows: 1. Place the bottom ring 201 of the disc on a pressure plate, and then insert the cylindrical pin 208.

[0047] 2. Place one outer disk 203, one inner disk 204 and another outer disk 203 into the cylindrical pin in sequence and stack them. Then place one spacer disk 205 in the stack to form the first maze unit group.

[0048] 3. Repeat step 2 to place the required maze unit components to form the first section.

[0049] 4. Then, place one outer disk 206, one inner disk 207, and another outer disk 206 into the cylindrical pin and stack them. Then, place one spacer disk 205 into the cylinder to form the second maze unit group.

[0050] 5. Repeat step 4 to place the required maze unit components. Note that the last group of unit components does not need the isolation plate 205 on top, forming the second segment.

[0051] 6. Place the top ring 202 of the disc on top.

[0052] 7. Press the entire maze assembly firmly with a special pressure plate and weld it with welding wire.

[0053] 8. After welding is completed, remove the clamping tool, grind the welded area smooth, and complete the component installation.

[0054] The labyrinth disc itself has a complex flow channel structure, which causes the fluid to change its flow direction multiple times. While hindering fluid flow, it also cancels out fluid pressure, further reducing the fluid pressure. When the fluid undergoes pressure reduction within the labyrinth disc, the pressure decrease is not a one-time event; it is achieved through multiple turns and collisions, gradually reducing the fluid's energy and pressure. This pressure reduction method divides the high pressure differential into multiple smaller pressure differentials, improving the pressure recovery coefficient of the control valve. This ensures that the valve outlet pressure remains stable above the fluid's saturated vapor pressure, effectively reducing cavitation and cavitation problems caused by single-stage pressure reduction in traditional control valves.

[0055] Multi-layer design of labyrinth discs: The flow channels of labyrinth discs are designed based on conventional calculations and fluid simulations. By combining different labyrinth discs, the flow channel length, different pressure reduction stages, and different pressure drops can be adjusted to obtain different flow characteristic curves, so as to meet different process requirements or on-site modification requirements and meet the needs of the site.

[0056] The labyrinth disc consists of two sets of discs with different flow channel designs. When a liquid medium is passed through, the pressure of the fluid is mainly reduced by the lower labyrinth disc; when a gas medium is passed through, the pressure of the fluid is mainly reduced by the upper labyrinth disc. The combination of the two meets the field requirements for adjusting various flow conditions and fluid states.

[0057] like Figure 6 As shown, small holes are distributed on the side wall of the sleeve. The main function of these holes is similar to that of the labyrinth sleeve assembly: to throttle, reduce noise, and reduce pressure on the fluid inside the control valve by diverting the fluid flow. Unlike traditional sleeves with holes of equal size, the holes on the side wall of this control valve sleeve are of varying sizes, arranged in three layers: a dense layer of holes at the bottom, a sparse layer of holes in the middle, and a large layer of holes at the top. This design is intended to work in conjunction with the aforementioned labyrinth disc assembly. The first labyrinth disc works with the dense holes at the bottom of the sleeve; due to the incompressible nature of the fluid, the dense hole distribution achieves better pressure reduction and noise reduction. The second labyrinth disc works with the sparse holes in the middle layer of the sleeve; due to the compressibility of the gas medium, the sleeve also undertakes a pressure reduction effect, hence the smaller hole area enhances the valve's pressure reduction effect. The large hole at the top of the labyrinth sleeve aims to minimize the pressure difference across the control valve when it is fully open, thereby maximizing the valve's maximum flow capacity.

[0058] like Figure 7 As shown, traditional labyrinth disc structures typically consist only of a labyrinth disc assembly and a valve core. When regulating flow, the valve's flow characteristic curve is mostly linear, and due to the thickness of the discs themselves, dead zones often occur during regulation, resulting in less than ideal regulation effects. Compared to traditional structures, this regulating valve assembles the labyrinth disc assembly and labyrinth sleeve together during regulation. The spacer discs within the labyrinth disc assembly correspond to the small holes on the labyrinth sleeve, providing a sealing effect and preventing steam cross-flow between discs that could reduce regulation accuracy. The valve core is installed inside the sleeve, and the maximum flow area of ​​the labyrinth sleeve assembly and sleeve is controlled by the valve core. Because there is a transition area between the small holes in each layer of the sleeve, and because the flow channels of each group of discs in the labyrinth disc assembly correspond to the small holes on the sleeve, the area increase of the labyrinth disc assembly and sleeve is continuous during the valve core's regulation process. This eliminates the influence of valve dead zones and improves overall regulation accuracy.

[0059] like Figure 8 As shown, the main function of the cage-type valve seat in this control valve is to protect the valve body and flow channel. The design of this valve seat ensures that the high-speed fluid generated after pressure reduction does not directly impinge on the valve's inner wall. Instead, it diverts the fluid through small holes in the inner wall of the valve cage, protecting the valve body and reducing turbulent flow. Furthermore, it ensures that the components directly impinged by bubbles generated by flash evaporation are the valve seat, not other internal valve components. This results in lower manufacturing costs and easier replacement of the valve seat, extending the overall service life of the control valve and facilitating subsequent maintenance and repair.

[0060] The working principle of this invention is as follows: 1) Initial sealing in the closed state: When the valve is closed, the valve core is pressed tightly against the valve seat, forming the first metal hard seal; the metal C-ring, due to elastic deformation, forms a second elastic sealing surface with the inclined surface of the sleeve. The two work together to ensure the tightness of the valve when closed.

[0061] 2) First pressure reduction process: When the valve is running, the medium enters the regulating valve body through the valve inlet, and first enters the labyrinth disc assembly through the small holes on the outside of the labyrinth disc assembly. The flow channels distributed inside the labyrinth disc assembly will cause the fluid to change the flow direction multiple times, thereby playing the role of reducing the pressure of the fluid.

[0062] 3) Secondary pressure reduction process: After passing through the labyrinth disc assembly, the fluid enters the small hole at the labyrinth sleeve and flows downstream of the valve. Because there is a valve core inside the sleeve, and only a partial gap is left between the valve core and the sleeve, the opening and closing height of the valve core determines the flow rate of the fluid flowing downstream of the valve through the sleeve. At the same time, the small hole on the sleeve also reduces the pressure of the fluid in the second stage.

[0063] 4) Flow restriction process of cage-type valve seat: After passing through the sleeve, a valve cage is provided at the lower end of the valve seat. Small holes are opened on the surface of the valve cage. When the fluid passes through the small holes on the surface of the valve cage, it will be dispersed into multiple small-flow fluids. Finally, after the valve undergoes multi-stage pressure reduction, the fluid with the specified flow rate and pressure parameters is discharged to the downstream of the system through the outlet of the regulating valve, completing the pressure reduction process of the entire regulating valve.

[0064] 5) Operating status of various fluids: ① When liquid fluid passes through, under the same flow rate conditions, the volumetric flow rate of the liquid medium is smaller. During operation, its valve opening is often smaller, and the fluid is mainly depressurized through the lower disc of the labyrinth disc assembly. Therefore, the structural design of the lower disc determines its depressurization effect on the liquid fluid. At the same time, due to the incompressible nature of liquid fluid, the matching sleeve openings are more densely spaced.

[0065] ② When a gaseous fluid passes through, under the same flow rate conditions, the volumetric flow rate of the gaseous medium is several times greater than that of the liquid, and its valve opening is often larger. Although the disc assembly consists of two or more sets of labyrinth discs, the discs that play a decisive role in reducing pressure are mainly distributed at the upper end of the disc assembly. The influence of the labyrinth disc structure design with a small opening at the lower end on its pressure reduction effect will decrease as the opening increases. At the same time, due to the compressibility of the gaseous medium, and in order to further improve the pressure reduction effect of the sleeve, the openings matching the discs are relatively sparse.

[0066] ③ When a saturated liquid fluid passes through, it often undergoes flash evaporation due to a rapid decrease in pressure, resulting in a fluid with both liquid and vapor phases. If the bubbles in the fluid further collapse, causing cavitation, it can cause significant damage to the valve body structure. Since cavitation often occurs at the valve outlet, this invention designs the valve seat as a cage-like structure, shifting the primary erosion point of the fluid from the valve outlet to the valve seat during flash evaporation. The hardening treatment of the valve seat surface also makes it more resistant to harsh operating conditions, extending its service life. Compared to the damage and replacement of the valve body, the ease of replacement and material cost of the valve seat are more acceptable.

[0067] like Figure 9 As shown, a metal C-ring is installed within the sealing groove of the valve core assembly. The metal C-ring consists of an open circular shell with a hollow energy storage cavity inside. The base material of the C-ring is a nickel-based high-temperature alloy, Inconel 718, and a silver plating layer is applied to the outside of the base material. This material maintains extremely high strength and structural stability below 700℃. Surface treatment: A layer of high-purity silver (Ag 99.9%) with a thickness of 5~10μm is electroplated onto all outer surfaces of the C-ring (i.e., the surfaces in contact with the sleeve and sealing groove). The plating layer should be uniform, dense, and free of peeling defects.

[0068] Detailed Explanation of the Working Process of Metal C-Ring Seals: 1. Initial pre-tightening: When the valve is in the open state, due to its own elasticity, the silver-plated outer surface of the C-ring 300 has made slight contact with the inner wall of the sleeve and the valve core sealing groove, forming an initial seal.

[0069] 2. Closing and Compression: When the valve begins to close, the valve stem drives the valve core to move towards the valve seat. First, the valve core contacts the mating conical surface of the sleeve, initiating axial compression of the C-ring 300.

[0070] 3. Full Positioning and Pressure Activation: When the valve is fully closed, the valve core and valve seat sealing surfaces are tightly fitted. At this time, the C-ring is compressed to the preset working position. Simultaneously, high-temperature, high-pressure steam (e.g., pressure 1.6 MPa, temperature 350°C) inside the valve rushes into the energy storage chamber inside the C-ring. The medium pressure P acts on the inner wall of the C-ring, generating an outward force, as if "opening" the C-ring, causing its silver-plated outer surface to adhere tightly to the inner wall of the sleeve with a very high sealing ratio.

[0071] 4. Achieving a seal: In this state, the seal is achieved through a triple action: System self-tightening force: The self-tightening force generated by the medium pressure P, which increases linearly with the increase of system pressure.

[0072] Elastic base force: Stable elastic recovery force provided by the C-ring matrix of Inconel 718 material.

[0073] Microscopic sealing force: Under high pressure, the silver plating layer undergoes microscopic plastic flow, perfectly filling all microscopic unevennesses on the inner wall of the sleeve and the surface of the valve core sealing groove, forming the final dense sealing barrier.

[0074] Test results of the whole machine of the present invention: The regulating valve was installed in the flow test platform and its flow coefficient was tested in accordance with GB 30832-2014. The flow coefficient data of the valve under various opening conditions were obtained. The corresponding flow curve was plotted according to the data. The obtained curve basically matches the original design flow curve, which confirms that its structural design meets the design requirements.

[0075] It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. An angle labyrinth sleeve regulating valve suitable for high pressure and various media conditions, comprising a valve body (101), a valve seat (102), a valve stem (110), a valve core assembly, a labyrinth disc assembly, and a sleeve, characterized in that... The labyrinth disc assembly (200) is installed on the valve seat (102). The sleeve (104) is placed downward along the inner wall of the labyrinth disc assembly (200). The lower inner wall of the sleeve (104) is fitted with the upper outer wall of the valve seat (102). The sleeve (104) presses against the upper plane of the labyrinth disc assembly (200). The valve stem (110) is screwed into the upper thread of the valve core assembly (105), so that the two form an assembly that is installed into the valve along the inner wall of the sleeve (104). The small holes distributed on the side wall of the sleeve are divided into three layers: the bottom layer is dense holes, the middle layer is sparse holes, and the top layer is large holes.

2. The angle labyrinth sleeve regulating valve suitable for high pressure and various media states according to claim 1, characterized in that... The valve seat is a cage-type valve seat, which is located at the valve outlet.

3. The angle labyrinth sleeve regulating valve suitable for high pressure and various media states according to claim 2, characterized in that... The lower end of the valve seat is provided with a valve cage, and small holes are opened on the surface of the valve cage.

4. A type angle labyrinth sleeve regulating valve suitable for high pressure and various media conditions according to claims 1-3, characterized in that... A metal C-ring is provided in the sealing groove of the valve core assembly. The metal C-ring is composed of an open circular shell with a hollow energy storage cavity inside.

5. The angle labyrinth sleeve regulating valve suitable for high pressure and various media states according to claim 4, characterized in that... The base material of the C-ring is made of nickel-based high-temperature alloy Inconel 718, and the metal C-ring has a silver plating layer on the outside of the base material.

6. The angle labyrinth sleeve regulating valve suitable for high pressure and various media states according to claim 1, characterized in that... The maze disc assembly is composed of multiple sets of stacked maze unit components, with spacer discs between adjacent maze unit components, and positioning holes on each maze unit component, with cylindrical pins passing through the positioning holes.

7. The angle labyrinth sleeve regulating valve suitable for high pressure and various media states according to claim 6, characterized in that... The maze unit component includes an inner disc, and outer discs are respectively arranged on the upper and lower sides of the inner disc. The flow channel structure design of the inner disc and the outer disc is different.

8. The angle labyrinth sleeve regulating valve suitable for high pressure and various media states according to claim 7, characterized in that... Includes a first metal spiral wound gasket (103), which is placed at the bottom seal of the valve body (101), and the valve seat (102) presses the first metal spiral wound gasket (103).

9. A type angle labyrinth sleeve regulating valve suitable for high pressure and various media conditions according to claim 8, characterized in that... The upper end plane of the sleeve is provided with a second metal spiral wound pad (106), and the second metal spiral wound pad (106) is pressed by a compensation block (107). A third metal spiral wound pad (108) is then installed on the upper plane of the compensation block (107).

10. The angle labyrinth sleeve regulating valve suitable for high pressure and various media states according to claim 9, characterized in that... A valve cover is provided on the third metal spiral wound pad (108), and the valve body and the valve cover (109) are connected by bolt fasteners.

Images