Multi-stage depressurization regulating valve

Abstract

The utility model provides a multistage depressurization regulating valve which comprises a valve body, a valve cover, a valve seat, a valve element and a valve sleeve. The valve body is provided with a cavity, a first channel and a second channel, the first channel is connected to the lower portion of the cavity, and the second channel is connected to the side wall of the cavity. The valve cover is hermetically connected with the top of the valve body; the valve seat is installed in the first channel in a sealed mode, a pressure adjusting hole is formed in the valve seat in the axis direction, and a plurality of annular grooves are formed in the inner wall of the pressure adjusting hole at intervals in the axis direction. The valve sleeve is installed between the valve cover and the valve seat, the valve sleeve is provided with a sliding hole and a plurality of overflowing windows, the sliding hole is formed in the axis direction of the valve sleeve, and the overflowing windows are arranged in the circumferential direction of a valve cover shaft; the valve element is installed in the sliding hole in a sliding mode, a pressure adjusting section is arranged at the bottom of the valve element and is a trapezoidal frustum, and the outer wall of the pressure adjusting section can be attached to the pressure adjusting hole in a sealed mode. Only the valve seat, the valve sleeve and the valve element are arranged in the multi-stage pressure reduction regulating valve and are all of simple cylindrical or cylindrical structures, machining is easy, cost is low, and maintenance and replacement are convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a multi-stage pressure-reducing regulating valve. Background Art

[0002] With the development of modern industry, in pursuit of higher product quality and lower energy consumption, the operating pressure of many process flows is gradually increasing, so the application scope of high-pressure regulating valves is becoming wider and wider. At the same time, the performance requirements for high-pressure regulating valves are also getting higher and higher, requiring stable performance, simple structure, low cost, etc. In order to avoid cavitation in the valve, the high-pressure regulating valve needs to effectively achieve multi-stage pressure reduction.

[0003] In the prior art, the following regulating valves are proposed:

[0004] The invention patent with the patent publication number CN103542115A proposes an axial flow multi-stage pressure-reducing regulating valve. The gear transmission design effectively converts the angular displacement of the drive shaft into the linear displacement of the valve core. The action is smooth and gapless transmission can be achieved. The angular stroke actuator can be used to drive the valve, which reduces the installation height of the valve and saves space. The cascade valve core structure has a high flow capacity and complete anti-cavitation ability, and the cascade valve core can be designed into different throttling stages according to different pressure differences, effectively reducing the scouring damage of the fluid to the valve core surface.

[0005] The invention patent with the patent publication number CN115560084A proposes a high-pressure, low-noise multi-stage pressure-reducing regulating valve. The multi-layer cylinder is sleeved on the outer surface of the threaded valve stem, and the small holes are evenly distributed on the outer surface of the multi-layer cylinder. The multi-layer cylinder adopts a three-layer cylinder structure with three-layer distribution, which can buffer and reduce pressure in stages.

[0006] Patent CN115451137A proposes a labyrinth regulating valve, which is provided with a multi-layer cylindrical labyrinth core package. When the control opening of the regulating valve gradually increases and the medium flow through the regulating valve gradually increases, the single-layer cylindrical labyrinth core packages slide and contract one by one, so that as the flow increases, the number of working labyrinth core packages decreases, thereby reducing the obstruction of the labyrinth core package to the medium and avoiding excessive pressure difference between the inlet and outlet of the control valve.

[0007] The regulating valves mentioned in the above patents can effectively achieve multi-stage pressure reduction and avoid cavitation in the valve. However, the regulating valves of the above structures have many internal parts and are very complex in structure, which makes processing difficult, costly, and inconvenient to repair and replace. Utility Model Content

[0008] In view of this, the utility model proposes a multi-stage step-down regulating valve to solve the technical problems proposed in the above background technology that the valve has many internal parts and a very complex structure, is difficult to process, has high cost, and is inconvenient to repair and replace.

[0009] The technical solution of the utility model is achieved in this way:

[0010] The utility model provides a multi-stage pressure-reducing regulating valve, comprising a valve body, a valve cover, a valve seat, a valve core and a valve sleeve, wherein:

[0011] The valve body is provided with a cavity, a first channel and a second channel, the first channel is connected to the bottom of the cavity, and the second channel is connected to the side wall of the cavity;

[0012] The valve cover is sealed and connected to the top of the valve body;

[0013] The valve seat is sealed and installed in the first channel. The valve seat is provided with a pressure regulating hole along the axial direction. The pressure regulating hole is a tapered hole and the diameter of the top of the pressure regulating hole is the largest. A plurality of annular grooves are provided on the inner wall of the pressure regulating hole at intervals along the axial direction.

[0014] The valve sleeve is installed in the cavity and is located between the valve cover and the valve seat. The valve sleeve is provided with a sliding hole and a plurality of flow windows. The sliding hole is arranged along the axial direction of the valve sleeve. The plurality of flow windows are arranged along the circumferential direction of the valve cover axis. The flow windows are used to connect the sliding hole and the second channel.

[0015] The valve core is slidably installed in the sliding hole. A pressure regulating section is provided at the bottom of the valve core. The pressure regulating section is a trapezoidal frustum, and the outer wall of the pressure regulating section can be sealed and fitted with the pressure regulating hole.

[0016] On the basis of the above technical solution, preferably, the valve core also includes a sliding section and a transition section; the sliding section is slidably installed in the sliding hole and can expose the flow window; the transition section is respectively connected to the sliding section and the pressure regulating section.

[0017] On the basis of the above technical solution, preferably, the valve core further includes a top segment, the top segment is arranged below the pressure regulating segment, and the top segment is a frustum.

[0018] On the basis of the above technical solution, preferably, the valve cover is provided with a first sealing hole and a first mounting hole in sequence from top to bottom along the axial direction, and the diameter of the sealing hole is larger than the diameter of the mounting hole;

[0019] The multi-stage step-down regulating valve also includes a gland, a first sealing ring and a valve stem; the gland is connected to the valve cover and partially extends into the first sealing hole, and a fixing hole is provided on the gland; the first sealing ring is sealingly arranged between the bottom surface of the gland and the bottom of the first sealing hole; the valve stem is connected to the fixing hole and passes through the first mounting hole to be connected to the sliding section.

[0020] On the basis of the above technical solution, preferably, the multi-stage pressure-reducing regulating valve further includes a hand wheel, a threaded section is provided on the top of the valve stem, and the hand wheel is connected to the threaded section.

[0021] On the basis of the above technical solution, preferably, a second sealing hole and a second mounting hole are provided at the top of the cavity, and the second sealing hole is located above the second mounting hole; a first sealing section and a first mounting section are provided at the top of the outer wall of the valve cover, and the first sealing section is installed in the second sealing hole, and the first mounting section is installed in the second mounting hole;

[0022] The multi-stage pressure-reducing regulating valve further includes a second sealing ring, which is sealingly installed between the bottom surface of the first sealing section and the bottom of the second sealing hole.

[0023] On the basis of the above technical solution, preferably, the valve sleeve is nested and installed between the inner wall of the second installation hole and the first installation section;

[0024] One end surface of the second sealing ring seals against the bottom surface of the first sealing section, and the other end surface seals against the bottom of the second sealing hole and the end surface of the valve sleeve.

[0025] On the basis of the above technical solution, preferably, the top of the first channel is provided with a third sealing hole and a third mounting hole in sequence from top to bottom, and the diameter of the third sealing hole is larger than the diameter of the third mounting hole; the top of the valve seat is provided with a second sealing section and a second mounting section, the second sealing section is provided in the third sealing hole, and the second mounting section is provided in the third mounting hole;

[0026] The multi-stage pressure-reducing regulating valve further includes a third sealing ring, and the third sealing ring is sealingly arranged between the bottom surface of the second sealing section and the bottom of the third sealing hole.

[0027] On the basis of the above technical solution, preferably, the spacing between adjacent annular grooves of the plurality of annular grooves is the same.

[0028] On the basis of the above technical solution, preferably, the widths of the plurality of annular grooves are the same.

[0029] The multi-stage pressure-reducing regulating valve of the utility model has the following beneficial effects compared with the prior art:

[0030] (1) The valve core is slidably installed in the sliding hole, a pressure regulating section is arranged at the bottom of the valve core, the pressure regulating section is a trapezoidal cone, and the outer wall of the pressure regulating section can be sealed and fitted with the pressure regulating hole, a plurality of annular grooves are arranged at intervals along the axial direction on the inner wall of the pressure regulating hole, the diameters of the plurality of annular grooves decrease from bottom to top, and the plurality of annular grooves can gradually reduce the pressure of the medium to avoid cavitation and harmful noise, and when necessary, the outer wall of the pressure regulating section is sealed and fitted with the pressure regulating hole to effectively cut off the medium; the internal parts of the valve only include the valve seat, the valve sleeve and the valve core, and all of them are simple cylindrical or cylindrical structures, which are simple to process, low in cost, and easy to repair and replace;

[0031] (2) The top section is arranged below the pressure regulating section. The top section is a truncated cone. The top section can buffer the flow transition of the medium, avoid the bottom surface transition of the pressure regulating section being too direct and form turbulence at the transition point, and improve the reliability and stability of the device;

[0032] (3) By arranging the spacing between adjacent annular grooves of the plurality of annular grooves to be the same, the diameter of each annular groove is controllable and known, so that the pressure drop of the medium is stable each time it passes through a layer of annular grooves, the controllability of the step-by-step pressure drop is achieved, and the stability of the device is improved;

[0033] (4) By setting the widths of the plurality of annular grooves to be the same, the pressure drop is only related to the diameter of the annular groove, and the pressure drop is stable, so that the controllability of the step-by-step pressure drop can be achieved, thereby improving the stability of the device;

[0034] (5) The first sealing ring is sealed between the bottom surface of the gland and the bottom of the first sealing hole to seal the gland and the first sealing hole, thereby preventing leakage of the medium between the gland and the valve stem and improving the reliability of the device;

[0035] (6) The second sealing ring is sealed and installed between the bottom surface of the first sealing section and the bottom of the second sealing hole to seal the valve cover and the cavity, thereby preventing the medium from leaking from the cavity at the second sealing hole and improving the reliability of the device;

[0036] (7) The third sealing ring is sealed between the bottom surface of the second sealing section and the bottom of the second mounting hole to seal the valve seat and the first channel, thereby preventing medium leakage between the first channel and the valve seat and improving the reliability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 It is a cross-sectional view of the multi-stage pressure-reducing regulating valve of the utility model;

[0039] Figure 2 It is a cross-sectional view of the valve body of the utility model;

[0040] Figure 3 It is a cross-sectional view of the valve cover of the utility model;

[0041] Figure 4 It is a cross-sectional view of the valve seat of the utility model;

[0042] Figure 5 It is a structural schematic diagram of the valve core of the utility model;

[0043] Figure 6 It is a schematic diagram of the medium flow of the multi-stage pressure-reducing regulating valve of the utility model in the working state.

[0044] Description of reference numerals: 1-valve body, 2-valve cover, 3-valve seat, 4-valve core, 5-valve sleeve, 6-pressure cover, 7-first sealing ring, 8-valve stem, 9-second sealing ring, 10-third sealing ring;

[0045] 11- cavity, 111- second sealing hole, 112- second mounting hole, 12- first channel, 121- third sealing hole, 122- third mounting hole, 13- second channel;

[0046] 21-first sealing hole, 22-first mounting hole, 23-first sealing section, 24-first mounting section;

[0047] 31-pressure regulating hole, 311-annular groove, 32-second sealing section, 33-second mounting section;

[0048] 41-pressure regulating section, 42-sliding section, 43-transition section, 44-top section;

[0049] 51-sliding hole, 52-flow window;

[0050] 61-fixing hole;

[0051] 81-Threaded segment. DETAILED DESCRIPTION

[0052] The following will be combined with the implementation of the utility model to clearly and completely describe the technical solutions in the implementation of the utility model. Obviously, the described implementation is only a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0053] Reference Figure 1-Figure 6 As shown, the embodiment of the utility model proposes a multi-stage pressure-reducing regulating valve, including a valve body 1, a valve cover 2, a valve seat 3, a valve core 4 and a valve sleeve 5, wherein:

[0054] The valve body 1 is provided with a cavity 11, a first channel 12 and a second channel 13, wherein the first channel 12 is connected to the bottom of the cavity 11, and the second channel 13 is connected to the side wall of the cavity 11;

[0055] The valve cover 2 is sealed and connected to the top of the valve body 1;

[0056] The valve seat 3 is sealed and installed in the first channel 12. The valve seat 3 is provided with a pressure regulating hole 31 along the axial direction. The pressure regulating hole 31 is a tapered hole and the diameter of the top of the pressure regulating hole 31 is the largest. A plurality of annular grooves 311 are provided on the inner wall of the pressure regulating hole 31 at intervals along the axial direction.

[0057] The valve sleeve 5 is installed in the cavity 11 and is located between the valve cover 2 and the valve seat 3. The valve sleeve 5 is provided with a sliding hole 51 and a plurality of flow windows 52. The sliding hole 51 is arranged along the axial direction of the valve sleeve 5. The plurality of flow windows 52 are arranged along the axial circumference of the valve cover 2. The flow windows 52 are used to connect the sliding hole 51 and the second channel 13.

[0058] The valve core 4 is slidably installed in the sliding hole 51 . A pressure regulating section 41 is provided at the bottom of the valve core 4 . The pressure regulating section 41 is a trapezoidal frustum, and the outer wall of the pressure regulating section 41 can be sealed and fitted with the pressure regulating hole 31 .

[0059] The multi-stage step-down regulating valve proposed in this embodiment is slidably installed in the sliding hole 51 by the valve core 4. A pressure regulating section 41 is provided at the bottom of the valve core 4. The pressure regulating section 41 is a trapezoidal cone, and the outer wall of the pressure regulating section 41 can be sealed and fitted with the pressure regulating hole 31. A plurality of annular grooves 311 are arranged at intervals along the axial direction on the inner wall of the pressure regulating hole 31. The diameters of the plurality of annular grooves 311 decrease from bottom to top. When the valve core 4 slides to a gap with the pressure regulating hole 31, after the medium enters from the first channel 12, After the medium is gradually depressurized through a plurality of annular grooves 311, it enters the second channel 13 and flows out through the sliding hole 51 and the flow window 52. The multi-stage step-down regulating valve can achieve step-by-step depressurization of the medium to avoid cavitation and harmful noise. When necessary, the medium can be effectively cut off by sealing the outer wall of the pressure regulating section 41 with the pressure regulating hole 31. The internal parts of the valve only include the valve seat 3, the valve sleeve 5 and the valve core 4, and all of them are simple cylindrical or cylindrical structures, which are simple to process, low in cost, and easy to repair and replace.

[0060] In some embodiments, the valve core 4 further includes a sliding section 42 and a transition section 43; the sliding section 42 is slidably installed in the sliding hole 51 and can expose the flow window 52; the transition section 43 is respectively connected to the sliding section 42 and the pressure regulating section 41. The sliding section 42 is slidably installed in the sliding hole 51, and the sliding section 42 can always expose the flow window 52 without affecting the flow of the medium. Through the sliding of the sliding section 42, the gap between the pressure regulating section 41 and the pressure regulating hole 31 is adjusted, thereby adjusting the opening of the valve; the transition section 43 is respectively connected to the sliding section 42 and the pressure regulating section 41, so that the diameter of the sliding hole 51 is larger than the diameter of the top of the regulating hole. When the liquid enters the sliding hole 51 with a large diameter from the regulating hole with a small diameter, the pressure will not increase, thereby ensuring the pressure reduction effect.

[0061] In some embodiments, the valve core 4 further includes a top section 44, which is disposed below the pressure regulating section 41 and is a truncated cone. The top section 44 is disposed below the pressure regulating section 41 and is a truncated cone, and the top section 44 can buffer the flow of the medium, thereby preventing the bottom surface of the pressure regulating section 41 from transitioning directly and forming turbulence at the transition point, thereby improving the reliability and stability of the device.

[0062] In some embodiments, the valve cover 2 is provided with a first sealing hole 21 and a first mounting hole 22 in sequence from top to bottom along the axial direction, and the diameter of the sealing hole is larger than the diameter of the mounting hole; the multi-stage step-down regulating valve also includes a gland 6, a first sealing ring 7 and a valve stem 8; the gland 6 is connected to the valve cover 2 and partially extends into the first sealing hole 21, and a fixing hole 61 is provided on the gland 6; the first sealing ring 7 is sealingly arranged between the bottom surface of the gland 6 and the bottom of the first sealing hole 21; the valve stem 8 is connected to the fixing hole 61 and passes through the first mounting hole 22 to connect with the sliding section 42. The first sealing ring 7 is sealingly arranged between the bottom surface of the gland 6 and the bottom of the first sealing hole 21, so as to seal the gland 6 and the first sealing hole 21, thereby avoiding leakage of the medium between the gland 6 and the valve stem 8 and improving the reliability of the device.

[0063] In some embodiments, the multi-stage step-down regulating valve further includes a hand wheel, a threaded section 81 is provided on the top of the valve stem 8, and the hand wheel is connected to the threaded section 81. The hand wheel is connected to the threaded section 81 and then fixed by bolts, and the valve stem 8 is raised and lowered by rotating the hand wheel, thereby driving the valve core 4 to rise and fall, which is convenient for adjustment and improves the convenience of the device.

[0064] In some embodiments, the top of the cavity 11 is provided with a second sealing hole 111 and a second mounting hole 112, and the second sealing hole 111 is located above the second mounting hole 112; the top of the outer wall of the valve cover 2 is provided with a first sealing section 23 and a first mounting section 24, the first sealing section 23 is installed in the second sealing hole 111, and the first mounting section 24 is installed in the second mounting hole 112; the multi-stage step-down regulating valve also includes a second sealing ring 9, and the second sealing ring 9 is sealingly installed between the bottom surface of the first sealing section 23 and the bottom of the second sealing hole 111. The second sealing ring 9 is sealingly installed between the bottom surface of the first sealing section 23 and the bottom of the second sealing hole 111, so as to seal the valve cover 2 and the cavity 11, avoid leakage of the medium in the cavity 11 at the second sealing hole 111, and improve the reliability of the device.

[0065] In some embodiments, the valve sleeve 5 is nested and installed between the inner wall of the second mounting hole 112 and the first mounting section 24; one end face of the second sealing ring 9 is sealed against the bottom face of the first sealing section 23, and the other end face is sealed against the bottom of the second sealing hole 111 and the end face of the valve sleeve 5. The valve sleeve 5 is nested and installed between the inner wall of the second mounting hole 112 and the first mounting section 24, so that they are conveniently positioned and installed with each other. The other end face of the second sealing ring 9 is sealed against the bottom of the second sealing hole 111 and the end face of the valve sleeve 5, so that the valve cover 2, the valve sleeve 5 and the cavity 11 are sealed, so as to avoid leakage of the medium in the cavity 11 at the second sealing hole 111, and improve the reliability of the device.

[0066] In some embodiments, the top of the first channel 12 is provided with a third sealing hole 121 and a third mounting hole 122 in order from top to bottom, and the diameter of the third sealing hole 121 is larger than the diameter of the third mounting hole 122; the top of the valve seat 3 is provided with a second sealing section 32 and a second mounting section 33, the second sealing section 32 is arranged in the third sealing hole 121, and the second mounting section 33 is arranged in the third mounting hole 122; the multi-stage step-down regulating valve also includes a third sealing ring 10, and the third sealing ring 10 is sealingly arranged between the bottom surface of the second sealing section 32 and the bottom of the third sealing hole 121. The third sealing ring 10 is sealingly arranged between the bottom surface of the second sealing section 32 and the bottom of the third sealing hole 121, so as to seal between the valve seat 3 and the first channel 12, avoid leakage of the medium between the first channel 12 and the valve seat 3, and improve the reliability of the device.

[0067] In some embodiments, the spacing between adjacent annular grooves 311 of the plurality of annular grooves 311 is the same. By setting the spacing between adjacent annular grooves 311 of the plurality of annular grooves 311 to be the same, the diameter of each annular groove 311 is controllable and known, so that the pressure drop of the medium is stable each time it passes through a layer of annular grooves 311, the controllability of the step-by-step pressure drop is achieved, and the stability of the device is improved.

[0068] On the basis of the above technical solution, preferably, the widths of the plurality of annular grooves 311 are the same. By setting the widths of the plurality of annular grooves 311 to be the same, the pressure drop is only related to the diameter of the annular groove 311, and the pressure drop is stable, and the controllability of the step-by-step pressure drop can be achieved, thereby improving the stability of the device.

[0069] The working principle of the multi-stage step-down regulating valve is as follows: the valve core 4 is slidably installed in the sliding hole 51, a pressure regulating section 41 is arranged at the bottom of the valve core 4, the pressure regulating section 41 is a trapezoidal cone, and the outer wall of the pressure regulating section 41 can be sealed and fitted with the pressure regulating hole 31, a plurality of annular grooves 311 are arranged at intervals along the axial direction on the inner wall of the pressure regulating hole 31, and the diameters of the plurality of annular grooves 311 decrease from bottom to top, when the valve core 4 slides to a gap with the pressure regulating hole 31, the medium enters from the first channel 12, After the medium is gradually depressurized through a plurality of annular grooves 311, it enters the second channel 13 and flows out through the sliding hole 51 and the flow window 52. The multi-stage step-down regulating valve can achieve step-by-step depressurization of the medium to avoid cavitation and harmful noise. When necessary, the medium can be effectively cut off by sealing the outer wall of the pressure regulating section 41 with the pressure regulating hole 31. The internal parts of the valve only include the valve seat 3, the valve sleeve 5 and the valve core 4, and all of them are simple cylindrical or cylindrical structures, which are simple to process, low in cost, and easy to repair and replace.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-stage pressure reducing regulating valve, characterized in that: It includes valve body, valve cover, valve seat, valve core and valve sleeve, among which: The valve body is provided with a cavity, a first channel and a second channel, the first channel is connected to the bottom of the cavity, and the second channel is connected to the side wall of the cavity; The valve cover is sealed and connected to the top of the valve body; The valve seat is sealed and installed in the first channel. The valve seat is provided with a pressure regulating hole along the axial direction. The pressure regulating hole is a tapered hole and the diameter of the top of the pressure regulating hole is the largest. A plurality of annular grooves are provided on the inner wall of the pressure regulating hole at intervals along the axial direction. The valve sleeve is installed in the cavity and is located between the valve cover and the valve seat. The valve sleeve is provided with a sliding hole and a plurality of flow windows. The sliding hole is arranged along the axial direction of the valve sleeve. The plurality of flow windows are arranged along the circumferential direction of the valve cover axis. The flow windows are used to connect the sliding hole and the second channel. The valve core is slidably installed in the sliding hole. A pressure regulating section is provided at the bottom of the valve core. The pressure regulating section is a trapezoidal frustum, and the outer wall of the pressure regulating section can be sealed and fitted with the pressure regulating hole.

2. The multi-stage pressure reducing regulating valve according to claim 1, characterized in that: The valve core also includes a sliding section and a transition section; the sliding section is slidably installed in the sliding hole and can expose the flow window; the transition section is respectively connected to the sliding section and the pressure regulating section.

3. The multi-stage pressure reducing regulating valve according to claim 2, characterized in that: The valve core also includes a top segment, which is arranged below the pressure regulating segment and is a frustum.

4. The multi-stage pressure reducing regulating valve according to claim 2, characterized in that: The valve cover is provided with a first sealing hole and a first mounting hole in sequence from top to bottom along the axial direction, and the diameter of the sealing hole is larger than the diameter of the mounting hole; The multi-stage step-down regulating valve also includes a gland, a first sealing ring and a valve stem; the gland is connected to the valve cover and partially extends into the first sealing hole, and a fixing hole is provided on the gland; the first sealing ring is sealingly arranged between the bottom surface of the gland and the bottom of the first sealing hole; the valve stem is connected to the fixing hole and passes through the first mounting hole to be connected to the sliding section.

5. The multi-stage pressure reducing regulating valve according to claim 4, characterized in that: The multi-stage pressure-reducing regulating valve further comprises a hand wheel, a threaded section is arranged on the top of the valve stem, and the hand wheel is connected to the threaded section.

6. The multi-stage pressure reducing regulating valve according to claim 1, characterized in that: The top of the cavity is provided with a second sealing hole and a second mounting hole, and the second sealing hole is located above the second mounting hole; the top of the outer wall of the valve cover is provided with a first sealing section and a first mounting section, the first sealing section is installed in the second sealing hole, and the first mounting section is installed in the second mounting hole; The multi-stage pressure-reducing regulating valve further includes a second sealing ring, which is sealingly installed between the bottom surface of the first sealing section and the bottom of the second sealing hole.

7. The multi-stage pressure reducing regulating valve according to claim 6, characterized in that: The valve sleeve is nested and installed between the inner wall of the second installation hole and the first installation section; One end surface of the second sealing ring seals against the bottom surface of the first sealing section, and the other end surface seals against the bottom of the second sealing hole and the end surface of the valve sleeve.

8. The multi-stage pressure reducing regulating valve according to claim 7, characterized in that: The top of the first channel is provided with a third sealing hole and a third mounting hole in sequence from top to bottom, and the diameter of the third sealing hole is larger than the diameter of the third mounting hole; the top of the valve seat is provided with a second sealing section and a second mounting section, the second sealing section is provided in the third sealing hole, and the second mounting section is provided in the third mounting hole; The multi-stage pressure-reducing regulating valve further includes a third sealing ring, and the third sealing ring is sealingly arranged between the bottom surface of the second sealing section and the bottom of the third sealing hole.

9. The multi-stage pressure-reducing regulating valve according to any one of claims 1 to 8, characterized in that: The spacings between adjacent annular grooves of the plurality of annular grooves are the same.

10. The multi-stage pressure-reducing regulating valve according to any one of claims 1 to 8, characterized in that: The widths of the plurality of annular grooves are the same.

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