Labyrinth pressure reducing valve

Abstract

The present application relates to a kind of labyrinth pressure reducing valve, including valve body assembly, valve seat assembly and valve core assembly;The valve body assembly has input and output;The valve seat assembly is between the input and the output, and cooperate with the valve core assembly to realize the conduction or interruption of the input and the output;The valve seat assembly is detachably connected with the valve body assembly;It also includes the labyrinth assembly arranged downstream of the valve seat assembly, the labyrinth assembly has first abutment surface and second abutment surface arranged oppositely, the first abutment surface is in abutment with the valve body assembly, and the second abutment surface is in abutment with the valve seat assembly, with the advantages of facilitating disassembly and overhaul and stable installation.

Description

Technical Field

[0001] This invention relates to the technical field of pressure reducing valves, and in particular to a labyrinth-type pressure reducing valve. Background Technology

[0002] Labyrinth pressure reducing valves are often used to cope with extreme pressure differential conditions to achieve smooth fluid pressure reduction. For example, they are often used in the main steam system of power plant turbines, important systems of nuclear power plants, and key pressure reduction links of large chemical plants. The accuracy and stability of labyrinth pressure reducing valve control affect the safety and efficiency of the entire system.

[0003] Existing labyrinth pressure reducing valves include a valve body, valve seat, valve core, and labyrinth assembly. The valve body, valve seat, and valve core work together to achieve the on / off switching of the labyrinth pressure reducing valve. The labyrinth assembly consumes the fluid's pressure and energy step by step through multi-stage, meandering flow channels, thereby achieving a smooth pressure reduction. For example, the pre-opening angle-type medium-temperature and medium-pressure desuperheating and pressure reducing valve disclosed in Chinese Patent Publication No. CN209115746U achieves fluid pressure reduction by setting an inner throttling sleeve, a middle throttling sleeve, and an outer throttling sleeve with throttling orifices outside the outlet channel, as well as the throttling cavity formed between the inner throttling sleeve, the middle throttling sleeve, and the outer throttling sleeve.

[0004] When high-speed fluid flows through the inner, middle, and outer throttling sleeves, it generates significant impact, causing erosion and wear, especially on the inner throttling sleeve. Furthermore, when the fluid is liquid, the pressure changes drastically as it flows through these sleeves, causing rapid formation and collapse of air bubbles, resulting in strong localized shock waves. These tiny explosions continuously peel away material from the surface, leading to cavitation damage. Since the inner throttling sleeve is integrally formed with the valve body, it, along with the surrounding middle and outer throttling sleeves, becomes difficult to maintain. When the inner throttling sleeve is damaged, both the valve body and the inner throttling sleeve must be replaced simultaneously, requiring the disassembly and reassembly of all components mounted on the valve body, further increasing maintenance difficulty and cost. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defects in the prior art, thereby providing a labyrinth-type pressure reducing valve.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A labyrinth-type pressure reducing valve includes a valve body assembly, a valve seat assembly, and a valve core assembly;

[0008] The valve body assembly has an input section and an output section;

[0009] The valve seat assembly is located between the input section and the output section, and cooperates with the valve core assembly to enable or disable the input section and the output section;

[0010] The valve seat assembly is detachably connected to the valve body assembly;

[0011] It also includes a labyrinthine component disposed downstream of the valve seat assembly, the labyrinthine component having a first abutting surface and a second abutting surface disposed opposite to each other, the first abutting surface abutting against the valve body assembly, and the second abutting surface abutting against the valve seat assembly.

[0012] Preferably, the valve body assembly includes a first step and a second step;

[0013] The labyrinthine assembly is sealed and pressed against the first step by the valve seat assembly;

[0014] The labyrinth pressure reducing valve also includes a fixing component connected to the valve body assembly and sealingly presses the valve seat assembly against the second step of the valve body assembly.

[0015] Preferably, it further includes a high-temperature and high-pressure resistant seal, which is located between the second contact surface of the labyrinth assembly and the valve seat assembly;

[0016] and / or;

[0017] It also includes a sealing ring, which is pressed between the valve body assembly and the valve seat assembly;

[0018] and / or;

[0019] It also includes a porous sleeve, which is inserted upstream of the valve seat assembly and forms a radial limiting connection with the valve seat assembly. The radially inner side of the porous sleeve forms an operating cavity that surrounds the valve core assembly, and a portion of the outer wall surface of the valve core assembly abuts against the inner wall surface of the porous sleeve.

[0020] Preferably, the high-temperature and high-pressure resistant sealing element is configured as a metal C-shaped sealing ring, the second abutment surface is partially recessed to form an annular groove, and the metal C-shaped sealing ring is partially located within the annular groove;

[0021] And / or,

[0022] The sealing ring is configured as an elastic sealing ring;

[0023] And / or,

[0024] The high-temperature and high-pressure resistant seal is located radially inside the sealing ring.

[0025] Preferably, the valve seat assembly includes a first surface and a second surface, the first surface facing the second abutment surface and the second surface facing the fixing assembly;

[0026] The fixing component includes a pressure ring and a first double-waisted self-locking washer;

[0027] The pressure ring is threadedly connected to the threaded hole on the valve body assembly to press the first double-waist self-locking washer onto the second surface.

[0028] Preferably, the second surface is recessed away from the fixed component to form a groove;

[0029] The fixing assembly also includes a locking bolt, a locking nut, a second double-waisted self-locking washer, and a third double-waisted self-locking washer;

[0030] The locking bolt passes through the locking nut, the second double-waisted self-locking washer, the pressure ring, and the third double-waisted self-locking washer in sequence to extend into the recess;

[0031] The locking bolt is threadedly connected to the pressure ring, and the locking bolt presses the third double-waist self-locking washer into the groove.

[0032] The locking bolt is also threadedly connected to the locking nut, and the locking nut presses the second double-waisted self-locking washer onto the pressure ring.

[0033] Preferably, the valve body assembly further includes a third step, the third step having a predetermined distance from the end of the threaded hole near the second surface.

[0034] Preferably, the labyrinth assembly includes a sleeve, a labyrinth unit, and a pressure cap;

[0035] The sleeve is provided with a first abutting surface and a second abutting surface;

[0036] The end of the sleeve away from the first abutment surface and the second abutment surface is detachably connected to the pressure cap to confine the labyrinth unit to the outer periphery of the sleeve.

[0037] Preferably, the maze unit comprises a plurality of maze-shaped disks;

[0038] Several of the labyrinth-shaped discs are stacked along the axial direction of the sleeve to form a labyrinth flow channel.

[0039] Preferably, the sleeve is provided with a lifting hole, and the lifting hole is formed on the second abutment surface.

[0040] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0041] The present invention provides a labyrinth-type pressure reducing valve. During the process of the valve seat assembly and the valve core assembly cooperating to control the opening or closing of the input and output parts, a certain amount of collision will occur between them. At the same time, when the fluid flows through the valve seat assembly, it may cause certain erosion or cavitation, thereby affecting the sealing performance of the valve seat assembly and affecting the accuracy and stability of the labyrinth-type pressure reducing valve. However, by detachably connecting the valve seat assembly and the valve body assembly, it is convenient to inspect and maintain the valve seat assembly. Similarly, as the main structure for pressure reduction, the labyrinth component is also susceptible to fluid impact. The large pressure difference when fluid flows through the labyrinth component can easily lead to cavitation. Therefore, the design of the labyrinth component's first contact surface abutting against the valve body assembly and the second contact surface abutting against the valve seat assembly serves two purposes. First, it facilitates disassembly and maintenance of the labyrinth component while ensuring its installation stability. This prevents the labyrinth component from shaking and colliding with the valve seat assembly or valve core assembly during fluid impact, thus avoiding damage to these components and preventing noise generation. Second, when the labyrinth component is subjected to fluid forces, the action and reaction forces at the contact point between the labyrinth component and the valve seat assembly (i.e., the second contact surface) can cancel each other out. This prevents the fluid forces from being directly transmitted to the valve seat assembly, ensuring the stability of both components. Attached Figure Description

[0042] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the labyrinth-type pressure reducing valve provided by the present invention.

[0044] Figure 2 for Figure 1 A cross-sectional diagram.

[0045] Figure 3 for Figure 2 An enlarged view of position D1 in the middle.

[0046] Figure 4 for Figure 2 An enlarged view of position D2 in the middle.

[0047] Figure 5 for Figure 2 Enlarged diagram of position D3 in the middle.

[0048] Explanation of reference numerals in the attached figures:

[0049] 1. Valve body assembly; 101. First step; 102. Second step; 103. Third step; 11. Input section; 12. Output section; 13. Threaded hole; 2. Valve seat assembly; 20. Multi-hole sleeve; 201. First surface; 202. Second surface; 21. Communicating channel; 3. Valve core assembly; 4. Labyrinth assembly; 401. First abutment surface; 402. Second abutment surface; 41. Sleeve; 411. Lifting hole; 42. Labyrinth unit; 43. Pressure cap; 5. Fixing assembly; 51. Pressure ring; 52. First double-waisted self-locking washer; 53. Locking bolt; 54. Locking nut; 55. Second double-waisted self-locking washer; 56. Third double-waisted self-locking washer; 6. High temperature and high pressure resistant seal; 7. Sealing ring; 8. Annular groove; 9. Sink. Detailed Implementation

[0050] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0051] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0052] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0053] See Figures 1 to 5 This invention provides a labyrinth-type pressure reducing valve, including a valve body assembly 1, a valve seat assembly 2, and a valve core assembly 3. The valve body assembly 1 has an input section 11 and an output section 12. The valve seat assembly 2 is located between the input section 11 and the output section 12 and cooperates with the valve core assembly 3 to enable or disable the connection between the input section 11 and the output section 12.

[0054] Specifically, the input section 11 is configured as a fluid input chamber with an inlet, and the output section 12 is a fluid output chamber with an outlet. The valve seat assembly 2 has a connecting channel 21, one end of which connects to the fluid input chamber, and the other end connects to the fluid output chamber. The valve core assembly 3 is installed inside the fluid input chamber and can move within it. When the valve core assembly 3 moves to abut against the valve seat assembly 2, it can block the connection between the fluid input chamber and the connecting channel 21, thereby cutting off the connection between the input section 11 and the output section 12. When the valve core assembly 3 moves to separate from the valve seat assembly 2, it can connect the fluid input chamber and the connecting channel 21, thereby enabling the connection between the input section 11 and the output section 12.

[0055] It is worth noting that the valve core assembly 3 can adopt the valve core structure in the existing pressure reducing valve, such as a combination structure of valve core, valve stem and drive structure, or it can be set as a pilot balanced valve core, which can realize the conduction and cut-off of the input part 11 and the output part 12.

[0056] See Figures 1 to 5 The valve seat assembly 2 is detachably connected to the valve body assembly 1.

[0057] It is easy to understand that, during the process of the valve seat assembly 2 and the valve core assembly 3 cooperating to control the opening or closing of the input part 11 and the output part 12, a certain amount of collision will occur between them. At the same time, when the fluid flows through the valve seat assembly 2, it may cause certain erosion or cavitation, which will affect the sealing performance of the valve seat assembly 2 and affect the accuracy and stability of the labyrinth pressure reducing valve. The valve seat assembly 2 is detachably connected to the valve body assembly 1, which facilitates the inspection and maintenance of the valve seat assembly 2.

[0058] Furthermore, the labyrinth pressure reducing valve also includes a labyrinth component 4 disposed downstream of the valve seat assembly 2. The labyrinth component 4 has a first abutment surface 401 and a second abutment surface 402 disposed opposite to each other. The first abutment surface 401 abuts against the valve body assembly 1, and the second abutment surface 402 abuts against the valve seat assembly 2.

[0059] Similarly, as the main structure for pressure reduction, the labyrinth component 4 is also susceptible to fluid impact. When the fluid flows through the labyrinth component 4, the pressure difference is large, which can easily lead to cavitation. Therefore, the arrangement of the first contact surface 401 of the labyrinth component 4 abutting against the valve body component 1 and the second contact surface 402 abutting against the valve seat component 2 serves two purposes. First, it facilitates the disassembly and maintenance of the labyrinth component 4. Simultaneously, it ensures the stability of the labyrinth component 4 installation, preventing it from shaking during fluid impact and colliding with the valve seat component 2 or valve core component 3, thus avoiding damage to the valve core component 3, valve seat component 2, and labyrinth component 4, and preventing noise generation. Second, when the labyrinth component 4 is subjected to fluid force, the action and reaction forces at the contact point between the labyrinth component 4 and the valve seat component 2 (i.e., the position of the second contact surface 402) can cancel each other out. This prevents the force of the labyrinth component 4 from being directly transmitted to the valve seat component 2 when subjected to fluid force, ensuring the stability of both components.

[0060] It is worth noting that "opposite setting" means that the first abutment surface 401 and the second abutment surface 402 are parallel to each other, and the force applied by the valve seat assembly 2 to the first abutment surface 401 is opposite in direction to the force applied by the valve seat assembly 2 to the second abutment surface 402.

[0061] See Figures 1 to 5 The valve body assembly 1 includes a first step 101 and a second step 102; the labyrinth assembly 4 is sealed and pressed against the first step 101 by the valve seat assembly 2; the labyrinth pressure reducing valve also includes a fixing assembly 5, which is connected to the valve body assembly 1 and seals and presses the valve seat assembly 2 against the second step 102 of the valve body assembly 1.

[0062] Specifically, when the fixing component 5 is connected to the valve body assembly 1, it can apply a pushing force to the valve seat assembly 2, causing the valve seat assembly 2 to abut tightly against the second step 102 of the valve body assembly 1. This ensures the stable installation of the valve seat assembly 2 and increases the sealing performance between the valve seat assembly 2 and the valve body assembly 1. Simultaneously, the valve seat assembly 2 can further push the labyrinth assembly 4 against the first step 101 of the valve body assembly 1, increasing the stable installation of the labyrinth assembly and its sealing performance with the valve body assembly 1. When the fixing component 5 is removed from the valve body assembly 1, the valve seat assembly 2 and the labyrinth assembly 4 are no longer subjected to compressive force, thus facilitating their disassembly. In other words, the fixing component 5 achieves both stable installation and sealing performance between the valve body assembly 1, the valve seat assembly 2, and the labyrinth assembly 4, while also facilitating the assembly and disassembly of the valve seat assembly 2 and the labyrinth assembly 4.

[0063] It is worth noting that since the second step 102 is formed on the valve body assembly 1, the valve body assembly 1 has two inner wall surfaces with different diameters and a stepped surface corresponding to the position of the second step 102. Correspondingly, the valve seat assembly 2 can also form a stepped structure corresponding to the second step 102, so that when the valve seat assembly 2 is pressed onto the second step 102, the valve body assembly 1 can simultaneously achieve axial and radial limiting of the valve seat assembly 2, preventing the valve seat assembly 2 from wobbling in the axial and radial directions and ensuring the stability of the valve seat assembly 2 installation. Similarly, the upper end of the labyrinth component 4 can also form a stepped structure corresponding to the first step 101, so that when the labyrinth component 4 is pressed onto the first step 101, the valve body assembly 1 can achieve axial and radial limiting of the labyrinth component 4, preventing the labyrinth component 4 from wobbling in the axial and radial directions and ensuring the stability of the labyrinth component 4 installation.

[0064] It should be understood that the outer diameter of the first step 101 is equal to the inner diameter of the second step 102, which facilitates the sequential installation of the labyrinth assembly 4 and the valve seat assembly 2.

[0065] Furthermore, the valve port at the upper end of the valve seat assembly 2 is pressed against a porous sleeve 20 (its hole diagram is not shown), and the porous sleeve 20 is inserted upstream of the valve seat assembly 2, forming a radial limiting connection with the valve seat assembly 2. Simultaneously, the radially inner side of the porous sleeve 20 forms the operating cavity of the valve core assembly 3 (the valve core assembly 3 abuts against the inner wall of the operating cavity). This arrangement, on the one hand, enables the valve seat assembly 2 and the valve core assembly 3 to be aligned (i.e., their central axes coincide) using the porous sleeve 20, ensuring a sealing effect between the valve seat assembly 2 and the valve core assembly 3; on the other hand, the porous sleeve 20 can buffer the high-temperature, high-pressure fluid input from the input section 11, preventing it from directly impacting the valve core assembly 3.

[0066] Furthermore, when the high-pressure fluid enters the connecting channel 21 through the porous sleeve 20 and the narrow channel between the valve seat assembly 2 and the valve core assembly 3, the first and most significant pressure drop occurs. At this time, the fluid velocity is extremely high, and cavitation (cavitation) and loud noise are easily generated. The labyrinth assembly 4 is located downstream of the valve seat assembly 2. This arrangement allows the fluid to first pass through the connecting channel 21 of the valve seat assembly 2 and then immediately enter the labyrinth assembly 4. When the fluid flows through the labyrinth assembly 4 (specifically, the labyrinth flow channel formed on its labyrinth unit 42), it constantly changes direction and collides with each other, converting energy into heat energy, thereby effectively consuming energy, significantly reducing flow velocity, noise and vibration, and thus greatly mitigating cavitation damage to the valve body assembly 1 and downstream pipelines.

[0067] See Figures 2 to 4The labyrinth-type pressure reducing valve also includes a high-temperature and high-pressure resistant seal 6, which is located between the second contact surface 402 of the labyrinth-type component 4 and the valve seat assembly 2. Compared with ordinary elastic sealing rings, the high-temperature and high-pressure resistant seal 6 has high-temperature and high-pressure resistance, thus preventing the seal between the second contact surface 402 of the labyrinth-type component 4 and the valve seat assembly 2 from failing under high-temperature and high-pressure environments, ensuring an effective seal between the two.

[0068] Specifically, the high-temperature and high-pressure resistant sealing element 6 is configured as a metal C-shaped sealing ring, and the second abutment surface 402 is partially recessed to form an annular groove 8, with the metal C-shaped sealing ring partially located within the annular groove 8.

[0069] It is easy to understand that the metal C-type sealing ring is designed as an annular structure with a C-shaped cross-section. Its two ends abut against the second abutment surface 402 (i.e., the inner wall of the annular groove 8 formed by the recess on the second abutment surface 402) and the downstream end face of the valve seat assembly 2 (i.e., the first surface 201), respectively, to achieve an effective seal between the two. Furthermore, the annular groove 8 can radially limit the movement of the metal C-type sealing ring, preventing seal failure.

[0070] In addition, since the metal C-type sealing ring has a certain structural strength and resilience, it can better adapt to the pressure fluctuations between the labyrinth assembly 4 and the valve seat assembly 2, ensuring the sealing performance between the valve seat assembly 2 and the labyrinth assembly 4. At the same time, it avoids the labyrinth assembly 4 being directly transmitted to the valve seat assembly 2 when subjected to fluid forces, thus affecting the stability of the valve seat assembly 2.

[0071] Furthermore, the labyrinth-type pressure reducing valve also includes a sealing ring 7, which is pressed between the valve body assembly 1 and the valve seat assembly 2. Specifically, the sealing ring 7 is configured as an elastic sealing ring; the sealing ring 7 is located between the second step 102 and the valve seat assembly 2.

[0072] It should be understood that since the labyrinth component 4 will vibrate under the action of fluid (such as steam), the high temperature and high pressure resistant seal 6 and sealing ring 7 in this solution can prevent the vibration of the labyrinth component 4 from being transmitted to the valve seat component 2, thereby ensuring the stability of the valve seat component 2.

[0073] Furthermore, the high-temperature and high-pressure resistant sealing element 6 is located on the radial inner side of the sealing ring 7, that is, the metal C-type sealing ring is located on the radial inner side of the sealing ring 7.

[0074] Furthermore, both the high-temperature and high-pressure resistant seal 6 and the sealing ring 7 are provided with one ring, and are coaxially arranged. The diameter of the high-temperature and high-pressure resistant seal 6 is smaller than the diameter of the sealing ring 7.

[0075] It is not difficult to understand that in other embodiments, the high-temperature and high-pressure resistant seal 6 and the sealing ring 7 can both be provided with multiple rings, ensuring that the innermost ring is the high-temperature and high-pressure resistant seal 6.

[0076] When the high-temperature and high-pressure resistant sealing element 6 is set as a metal C-type sealing ring, and the sealing ring 7 is set as an elastic sealing ring, the two work together, and the diameter of the metal C-type sealing ring is smaller than the diameter of the elastic sealing ring (that is, the metal C-type sealing ring is located radially inside the elastic sealing ring), which can enhance the sealing effect while ensuring the service life of the elastic sealing ring. Specifically, the high-temperature and high-pressure resistant sealing element 6 located on the inner ring can achieve inner layer sealing and also isolate the high-temperature and high-pressure environment 51 inside the labyrinth pressure reducing valve from the elastic sealing ring, ensuring the service life of the elastic sealing ring. At the same time, the elastic sealing ring located on the outer ring can further enhance the sealing effect by utilizing its own elasticity. In addition, the elastic sealing ring located on the outer ring can also reduce vibration of the valve seat assembly 2, thereby ensuring the stability of the valve seat assembly 2 installation.

[0077] See Figures 2 to 5 The valve seat assembly 2 includes a first surface 201 and a second surface 202. The first surface 201 faces the second abutment surface 402, and the second surface 202 faces the fixing assembly 5. The fixing assembly 5 includes a pressure ring 51 and a first double-push self-locking washer 52. The pressure ring 51 is threadedly connected to the threaded hole 13 on the valve body assembly 1 to press the first double-push self-locking washer 52 onto the second surface 202. The cooperation between the pressure ring 51 and the first double-push self-locking washer 52 can ensure the stability of the valve seat assembly 2 during installation.

[0078] It is worth noting that since the labyrinth component 4 will vibrate under the action of fluid (such as steam), the setting of the first double-pad self-locking washer 52 can effectively prevent the valve seat component 2 from vibrating, and thus can also effectively prevent the connection between the pressure ring 51 and the valve body component 1 from becoming loose.

[0079] Furthermore, in order to facilitate the machining of the threaded hole 13, the valve body assembly 1 also includes a third step 103, which forms a preset distance with the end of the threaded hole 13 near the second surface 202.

[0080] Furthermore, the second surface 202 is recessed away from the fixing component 5 to form a recess 9; the fixing component 5 also includes a locking bolt 53, a locking nut 54, a second double-waisted self-locking washer 55, and a third double-waisted self-locking washer 56; the locking bolt 53 passes through the locking nut 54, the second double-waisted self-locking washer 55, the pressure ring 51, and the third double-waisted self-locking washer 56 in sequence to extend into the recess 9; the locking bolt 53 is threadedly connected to the pressure ring 51, and the locking bolt 53 presses the third double-waisted self-locking washer 56 into the recess 9; the locking bolt 53 is also threadedly connected to the locking nut 54, and the locking nut 54 presses the second double-waisted self-locking washer 55 onto the pressure ring 51.

[0081] It is easy to understand that the cooperation between the second double-waisted self-locking washer 55 and the third double-waisted self-locking washer 56 can further prevent the valve seat assembly 2 from vibrating, and thus effectively prevent the pressure ring 51 from loosening.

[0082] Furthermore, the thread direction between the locking bolt 53 and the locking nut 54, and the thread direction between the locking bolt 53 and the pressure ring 51 can be set in opposite directions to further ensure the stability of the installation between the pressure ring 51, the locking bolt 53 and the locking nut 54.

[0083] Furthermore, the locking bolt 53 extends into the groove 9 provided on the second surface 202 and is threadedly connected to the pressure ring 51. This allows for adjustment of the contact force between the valve seat assembly 2 and the labyrinth assembly 4, and between the valve seat assembly 2 and the valve body assembly 1, maintaining it within a reasonable range. This prevents excessive contact force from causing vibrations of the labyrinth assembly 4 to be easily transmitted to the valve seat assembly 2, and from causing plastic deformation of the high-temperature and high-pressure resistant seal 6 and sealing ring 7, thus affecting the sealing effect. Additionally, it prevents insufficient contact force from causing sealing failure between the labyrinth assembly 4 and the valve seat assembly 2, and between the valve seat assembly 2 and the valve body assembly 1.

[0084] See Figures 2 to 5 The labyrinth assembly 4 includes a sleeve 41, a labyrinth unit 42, and a pressure cap 43. The sleeve 41 has a first abutment surface 401 and a second abutment surface 402. One end of the sleeve 41 away from the first and second abutment surfaces 401 is detachably connected to the pressure cap 43 to confine the labyrinth unit 42 to the outer periphery of the sleeve 41. This arrangement allows the labyrinth unit 42 to be removed from the sleeve 41 after the pressure cap 43 is removed, without requiring disassembly of the sleeve 41, valve seat assembly 2, valve core assembly 3, etc., thus facilitating the maintenance of the labyrinth unit 42.

[0085] It should be understood that the sleeve 41 is provided with several through holes, which are connected to the flow channel on the valve seat assembly 2, and the labyrinth unit 42 has a labyrinth flow channel that connects the through holes and the output part 12.

[0086] Furthermore, the labyrinth unit 42 includes several labyrinth-shaped discs; the several labyrinth-shaped discs are stacked along the axial direction of the sleeve 41 to form a labyrinth flow channel. This arrangement further facilitates the disassembly, inspection, and maintenance of the labyrinth unit 42 and the sleeve 41, ensuring the pressure reduction effect of the labyrinth pressure reducing valve.

[0087] Furthermore, the sleeve 41 is provided with a lifting hole 411, and the lifting hole 411 is formed on the second abutment surface 402, which facilitates the lifting and installation of the sleeve 41.

[0088] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A labyrinth pressure reducing valve characterized by, The valve body assembly (1), the valve seat assembly (2) and the valve core assembly (3); The valve body assembly (1) has an input part (11) and an output part (12); The valve seat assembly (2) is located between the input part (11) and the output part (12) and cooperates with the valve core assembly (3) to realize the conduction or interruption of the input part (11) and the output part (12); The valve seat assembly (2) is detachably connected with the valve body assembly (1); Further comprising a labyrinth assembly (4) arranged downstream of the valve seat assembly (2), the labyrinth assembly (4) has a first abutting surface (401) and a second abutting surface (402) arranged oppositely, the first abutting surface (401) abuts against the valve body assembly (1), and the second abutting surface (402) abuts against the valve seat assembly (2); The valve body assembly (1) comprises a first step (101) and a second step (102); The labyrinth assembly (4) is sealingly pressed on the first step (101) by the valve seat assembly (2); The labyrinth pressure reducing valve further comprises a fixing assembly (5) connected with the valve body assembly (1) and sealingly pressing the valve seat assembly (2) on the second step (102) of the valve body assembly (1); The valve seat assembly (2) comprises a first surface (201) and a second surface (202), the first surface (201) faces the second abutting surface (402), and the second surface (202) faces the fixing assembly (5); The fixing assembly (5) comprises a pressing ring (51) and a first double-pad self-locking gasket (52); The pressing ring (51) is threadedly connected with a threaded hole (13) on the valve body assembly (1) to press the first double-pad self-locking gasket (52) on the second surface (202).

2. A labyrinth pressure reducing valve according to claim 1, characterized in that Further comprising a high-temperature and high-pressure resistant sealing element (6) located between the second abutting surface (402) of the labyrinth assembly (4) and the valve seat assembly (2); And / or; Further comprising a sealing ring (7) pressed between the valve body assembly (1) and the valve seat assembly (2); And / or; Further comprising a porous sleeve (20) inserted upstream of the valve seat assembly (2) and radially limitedly connected with the valve seat assembly (2), the porous sleeve (20) radially internally forms an enclosed operation cavity of the valve core assembly (3), and a partial outer wall surface of the valve core assembly (3) abuts against an inner wall surface of the porous sleeve (20).

3. A labyrinth pressure reducing valve according to claim 2, characterised in that The high-temperature and high-pressure resistant sealing element (6) is a metal C-shaped sealing ring, the second abutting surface (402) is partially recessed to form an annular groove (8), and the metal C-shaped sealing ring is partially located in the annular groove (8); And / or, The sealing ring (7) is an elastic sealing ring; And / or, The high-temperature and high-pressure resistant sealing element (6) is located radially inward of the sealing ring (7).

4. A labyrinth pressure reducing valve according to claim 1, wherein The second surface (202) is recessed away from the fixing assembly (5) to form a sink (9); The fixing assembly (5) further comprises a locking bolt (53), a locking nut (54), a second double-pad self-locking washer (55) and a third double-pad self-locking washer (56); The locking bolt (53) penetrates the locking nut (54), the second double-pad self-locking washer (55), the compression ring (51) and the third double-pad self-locking washer (56) in sequence and extends into the sink (9); The locking bolt (53) is threadedly connected with the compression ring (51), and the locking bolt (53) press-bonds the third double-pad self-locking washer (56) in the sink (9); The locking bolt (53) is further threadedly connected with the locking nut (54), and the locking nut (54) press-bonds the second double-pad self-locking washer (55) on the compression ring (51).

5. A labyrinth pressure reducing valve according to claim 1, wherein The valve body assembly (1) further comprises a third step (103), and an end of the third step (103) close to the threaded hole (13) is formed with a preset interval.

6. A labyrinth pressure reducing valve according to claim 1, wherein The labyrinth assembly (4) comprises a sleeve (41), a labyrinth unit (42) and a gland (43); The sleeve (41) is provided with a first abutting surface (401) and a second abutting surface (402); One end of the sleeve (41) away from the first abutting surface (401) and the second abutting surface (402) is detachably connected with the gland (43) to limit the labyrinth unit (42) on the outer circumferential side of the sleeve (41).

7. A labyrinth pressure reducing valve according to claim 6, characterised in that The labyrinth unit (42) comprises a plurality of labyrinth discs; The plurality of labyrinth discs are arranged in axial stacking to form a labyrinth flow channel.

8. A labyrinth pressure reducing valve according to claim 6, wherein The sleeve (41) is provided with a lifting hole (411), and the lifting hole (411) is formed on the second abutting surface (402).

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