Regulating valve

Abstract

The utility model relates to the technical field of flow control valves, and discloses a regulating valve which comprises a valve body, a first valve core, a second valve core and a third valve core, and the valve body is provided with an upper runner, a first cavity and a lower runner which are communicated in sequence; the upper valve cover is connected with the upper end of the valve body; the valve inner part comprises a valve cage, the valve cage is fixedly designed in the first cavity, the valve cage is provided with a second cavity, and the second cavity is communicated with the upper flow channel and the lower flow channel; the valve seat is detachably connected to the bottom of the second cavity; the upper end of the valve rod penetrates through the middle part of the upper valve cover; the valve element is arranged in the second cavity in a rotatable mode and located between the valve seat and the valve rod. The valve seat is arranged at the bottom of the second cavity in the valve cage, the valve seat can be directly taken out after the upper valve cover is opened, and the valve seat can be taken out without detaching the valve cage, so that the valve seat can be easily taken out and replaced.

Description

Technical Field

[0001] The utility model relates to the technical field of flow control valves, in particular to a regulating valve. Background Art

[0002] As the most important link in automatic control, the reliability and regulation accuracy of a regulating valve affect the safety and quality of the automatic operation of the system. Under the harsh working conditions of high pressure difference in the continuous blowdown system of a power plant boiler drum, the service life of the regulating valve in the harsh environment of high temperature and high pressure difference is very short. On the one hand, at the throttle orifice of the regulating valve, the medium flows at a high speed with strong kinetic energy, which can quickly erode streamlined fine grooves on the valve core and valve seat. Especially at a small opening degree, the throttle gap is small, the throttle speed reaches the maximum value, and the huge erosion effect will damage the surface passivation film of the passivated metal and prevent its re-passivation, resulting in a sharp increase in the corrosion rate. On the other hand, when the medium flows through the throttle orifice, its speed increases sharply and the pressure drops sharply. When the pressure is lower than the saturated vapor pressure, the liquid will flash into gas, forming a two-phase flow of gas and liquid. The gas entraps the unvaporized liquid droplets and impacts the valve core at an extremely high speed, causing great damage to the valve core. When the gas-liquid flow passes through the throttle orifice, the speed gradually decreases and the pressure gradually recovers. When the pressure is greater than the saturated vapor pressure, the bubbles burst, and the surrounding liquid fills the space occupied by the bubbles at a very high speed, resulting in a violent impact inside the liquid, causing honeycomb-shaped pits on the surface of the valve core, and finally leading to serious erosion and blowout damage of the valve core and valve seat, and serious internal leakage during operation, etc., and it is necessary to frequently replace the valve core and valve seat components.

[0003] The existing regulating valve adopts a structural form in which the upper valve cover presses the valve cage, and the valve seat is further pressed below the valve cage. Since the valve seat is arranged below the bottom of the valve cage, when replacing the valve seat component, it is necessary to take out the valve cage and then take out the valve seat for replacement. Due to the large volume of the valve cage and the difficulty in grasping it, the valve cage is prone to being knocked and damaged during the removal process, and the process of replacing the valve seat is quite troublesome. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to solve the problem that when the valve seat is worn and needs to be replaced, it is necessary to take out the valve cage, and the process of replacing the valve seat is troublesome.

[0005] To solve the above technical problems, the present utility model provides a regulating valve, comprising: a valve body provided with an upstream flow channel, a first cavity, and a downstream flow channel that are connected in sequence; an upper valve cover connected to the upper end of the valve body; and a valve internals located at the first cavity. Wherein, the valve internals include: a valve cage fixedly designed within the first cavity, the valve cage having a second cavity that communicates with the upstream flow channel and the downstream flow channel respectively; a valve seat detachably connected to the bottom of the second cavity; a valve stem, the upper end of which passes through the middle of the upper valve cover; and a valve core rotatably disposed within the second cavity and located between the valve seat and the valve stem, the diameter of the valve seat being less than or equal to the diameter of the valve core, and by rotating the valve core, the flow rates of the upstream flow channel and the downstream flow channel are adjusted.

[0006] Further, a plurality of perforated partitions are provided inside the valve cage, the aperture of the perforated partitions matching the diameter of the valve core, and valve core through slots are provided on both sides of the valve core at regular intervals, and the valve core through slots are located between two adjacent perforated partitions.

[0007] Further, the groove wall of the valve core through slot includes a first groove wall and a second groove wall, both ends of the first groove wall being connected to the second groove wall and the bottom of the valve core through slot respectively, and the angle formed by the first groove wall and the bottom of the valve core through slot being greater than the angle of the second groove wall.

[0008] Further, the valve core through slot includes a first through slot and a second through slot, the first through slot and the second through slot being arranged alternately along the length direction of the valve core, and the bottom of the first through slot being perpendicular to the bottom of the second through slot.

[0009] Further, the angle formed by the first groove wall and the bottom of the valve core through slot is greater than or equal to 30° and less than or equal to 60°, and the angle formed by the second groove wall and the bottom of the valve core through slot is greater than or equal to 10° and less than 30°.

[0010] Further, the intersection line of the second groove wall and the side surface of the valve core is arc-shaped.

[0011] Further, one end of the valve core is rotatably connected to the valve seat through a concave cavity, and the other end of the valve core is connected to the bottom end of the valve stem through a pin.

[0012] Further, the valve seat is arranged at the bottom of the second cavity through bolt connection or snap connection, or the valve seat is clamped between the valve cage and the valve core.

[0013] Further, a chamfer is provided on the inner wall of the downstream channel, and the chamfer is located directly below the second cavity.

[0014] Further, a first sealing portion is provided between the upper end of the valve element and the inner diameter of the valve cage, and a second sealing portion is provided between the upper end of the upper valve cover and the valve stem.

[0015] Compared with the prior art, the regulating valve provided by the embodiment of the present invention has the beneficial effect that: by arranging the valve seat at the bottom of the second cavity in the valve cage, when maintenance or replacement of the valve seat is required, the maintenance personnel can directly take out the valve element and the valve seat after opening the upper valve cover of the extrusion valve cage, so that the valve seat can be easily taken out and replaced. It is not necessary to disassemble the valve cage to take out the valve seat, which makes the valve seat easy to take out and replace, saving maintenance time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a cross-sectional view of the regulating valve provided by the present invention;

[0017] Figure 2 is a three-dimensional view of the valve element of the regulating valve provided by the present invention;

[0018] Figure 3 is a cross-sectional view of the valve element through groove of the regulating valve provided by the present invention.

[0019] Among them, the corresponding relationship between the reference numerals and the component names is as follows:

[0020] 1. Valve body; 101. Upstream channel; 102. Downstream channel; 103. First cavity;

[0021] 2. Upper valve cover;

[0022] 3. Valve internals; 31. Valve cage; 311. Hole partition plate; 32. Valve element; 321. First groove wall; 322. Second groove wall; 33. Valve stem; 34. Valve seat; 301. Second cavity; 302. Valve element through groove; 303. First through groove; 304. Second through groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following further describes in detail the specific embodiments of the present invention in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention. It should be noted that: unless otherwise specifically stated, the relative arrangements and numerical values of the components and steps described in these embodiments do not limit the scope of the present invention.

[0024] The description of at least one exemplary embodiment below is actually only illustrative and in no way limits the present invention and its application or use.

[0025] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be considered as part of the specification.

[0026] In all examples shown and discussed herein, any specific values should be construed as merely exemplary and not as a limitation. Thus, other examples of the exemplary embodiments may have different values.

[0027] It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

[0028] As Figures 1 to 3 shown, an embodiment of the present utility model discloses a regulating valve, including: a valve body 1, an upper valve cover 2, and an inner valve member 3.

[0029] Among them, the valve body is provided with an upstream flow channel 101, a first cavity 103, and a downstream flow channel 102 that are connected in sequence; the upper valve cover 2 is connected to the upper end of the valve body 1; the inner valve member 3 is located at the first cavity 103; the inner valve member 3 includes: a valve cage 31, the valve cage 31 is fixedly designed in the first cavity 103, the valve cage 31 is provided with a second cavity 301, and the second cavity 301 is respectively communicated with the upstream flow channel 101 and the downstream flow channel 102; a valve seat 34, the valve seat 34 is detachably connected to the bottom of the second cavity 301; a valve stem 33, the upper end of the valve stem 33 passes through the middle of the upper valve cover 2; a valve core 32, the valve core 32 is rotatably arranged in the second cavity 301 and is located between the valve seat 34 and the valve stem 33, and the diameter of the valve seat 34 is less than or equal to the diameter of the valve core 32. By rotating the valve core 32, the flow rates of the upstream flow channel 101 and the downstream flow channel 102 are adjusted.

[0030] For the regulating valve of the present application, by arranging the valve seat 34 at the bottom of the second cavity 301, when maintenance or replacement of the valve seat 34 is required, maintenance personnel can directly remove the valve core 32 and the valve seat 34 after opening the upper valve cover 2 that presses the valve cage 31, so that the valve seat 34 can be easily removed and replaced, and the valve seat 34 can be removed without disassembling the valve cage 31, saving maintenance time and cost.

[0031] Since the valve seat 34 is easy to replace, it can quickly respond to the damage or replacement need of the valve seat 34, effectively reducing the downtime during maintenance, contributing to the stable continuous operation of industrial equipment and improving production efficiency. By regularly replacing the valve seat 34, the normal operation state and performance stability of the regulating valve are maintained. The easy replacement of the valve seat 34 can also reduce the leakage risk caused by the wear or damage of the valve seat 34, enhancing the sealing performance and reliability of the regulating valve; at the same time, it enables maintenance personnel to more conveniently access the interior of the regulating valve to perform repair and maintenance tasks, and the simplified maintenance process helps improve work efficiency and operation safety.

[0032] By arranging the valve seat 34 at the bottom of the second cavity 301, the upper valve cover 2 presses the valve cage 31, the valve cage 31 abuts against the bottom of the first cavity 103, and the valve seat 34 is arranged between the valve cage 31 and the valve core 32. Compared with the existing structural design in which the valve cage 31 presses the valve seat 34, the installation method of the valve seat 34 in this application makes the maintenance more convenient. When the valve seat 34 needs to be replaced, only the valve seat 34 component needs to be taken out, without moving the entire valve cage 31, greatly reducing the complexity and risk of maintenance operations.

[0033] Specifically, a flange is provided at the lower end of the upper valve cover 2, and the upper valve cover 2 is connected to the upper end of the valve body 1 through the flange. One end of the valve core 32 is rotationally connected to the valve seat 34 through a concave cavity, and the other end of the valve core 32 is connected to the bottom end of the valve rod 33 through a pin.

[0034] As Figure 1 shown, in an alternative embodiment of the utility model, a plurality of perforated partitions 311 are arranged inside the valve cage 31. The aperture diameter of the perforated partitions 311 matches the diameter of the valve core 32. Valve core through grooves 302 are provided on both sides of the valve core 32 at regular intervals, and the valve core through grooves 302 are located between two adjacent perforated partitions 311.

[0035] By arranging the valve core through grooves 302 between two adjacent perforated partitions 311, the valve core through grooves 302 are located in the chamber surrounded by the perforated partitions 311. By rotating the valve core 32, the flow rate of the medium flowing through the chamber surrounded by the partitions can be controlled in multiple segments. The valve core through grooves 302 in the chamber surrounded by the plurality of perforated partitions 311 continuously consume the fluid energy to reduce the flow rate, thereby reducing the pressure difference of the liquid entering and leaving each stage of the valve core through grooves 302, greatly reducing the cavitation and erosion phenomena, contributing to industrial and laboratory applications that require high-precision flow control, and ensuring stable system operation and high precision. The valve core through grooves 302 cooperating with the chamber surrounded by the perforated partitions 311 can effectively reduce the formation of turbulence and eddy currents of the medium inside the valve cage 31, thereby reducing the noise and vibration generated when the fluid passes through the regulating valve, contributing to meeting the occasions requiring quiet operation and reducing equipment vibration, and improving the comfort and safety of the working environment.

[0036] The arrangement of the perforated partition 311 not only provides support and positioning for the position of the valve core 32, but also helps to balance the force of the medium flow, reducing the unstable factors of the valve core 32 during operation. This stability improves the long-term reliability and durability of the regulating valve, reducing the frequency of maintenance and component replacement. Through the chambers formed by multiple valve core through slots 302 and multiple perforated partitions 311, the medium flow area can be increased, improving the response speed of the regulating valve, quickly responding and more precisely regulating the medium flow rate, meeting the demand of the continuous blowdown system for rapid response to flow changes, and enhancing the production efficiency and system control ability.

[0037] As Figure 1 and Figure 2 shown, in an alternative embodiment of the utility model, the groove wall of the valve core through slot 302 includes a first groove wall 321 and a second groove wall 322. Both ends of the first groove wall 321 are respectively connected to the second groove wall 322 and the bottom of the valve core through slot 302. The included angle formed by the first groove wall 321 and the bottom of the valve core through slot 302 is greater than that of the second groove wall 322.

[0038] By dividing the groove wall of the valve core through slot 302 into a first groove wall 321 and a second groove wall 322, and the inclination of the first groove wall 321 relative to the bottom of the slot is greater than that of the second groove wall 322 relative to the bottom of the slot, the flow velocity and flow direction of the medium can be effectively adjusted. The smaller inclination of the second groove wall 322 can introduce the medium fluid into the valve core through slot 302, while the larger inclination of the first groove wall 321 can more strongly slow down the flow of the medium fluid, guiding the fluid to pass through the valve core through slot 302 in a way that is more likely to slow down the flow, thereby reducing or increasing the flow velocity and pressure of the medium to meet the fluid control requirements under different operating conditions.

[0039] The setting of the inclination of the first groove wall 321 and the second groove wall 322 helps to slow down the flow velocity of the medium in the valve core through slot 302, which can reduce the impact force and pressure loss of the medium when passing through the regulating valve, reduce the vibration and noise of the pipeline system, and enhance the stability and reliability of the system. The first groove wall 321 with a larger inclination can effectively reduce the jet effect, that is, the high-speed impact effect when the medium passes through a narrow channel. This effect may cause pressure fluctuations and equipment wear. By slowing down the flow of the fluid, these problems can be effectively alleviated, and the service life of the equipment and the regulating valve can be extended. Since the flow of the medium is more finely controlled, dividing the groove wall of the valve core through slot 302 into a first groove wall 321 and a second groove wall 322 helps to improve the stability and control accuracy of the regulating valve, meet the industrial fluid control system that requires precise regulation and high performance, and ensure the reliable operation and precise operation of the system under different working conditions.

[0040] As Figure 1 and Figure 2As shown, in an alternative embodiment of the utility model, the valve core through groove 302 includes a first through groove 303 and a second through groove 304. The first through groove 303 and the second through groove 304 are arranged alternately along the length direction of the valve core 32, and the bottom of the first through groove 303 is perpendicular to the bottom of the second through groove 304.

[0041] By arranging the first through groove 303 and the second through groove 304 alternately along the length direction of the valve core 32, different pressure drops are generated at different positions in the valve core through groove 302, which can effectively control the pressure drop degree of each stage, thereby reducing the total pressure drop in the entire system. By precisely controlling the pressure drops at each stage, the occurrence of cavitation can be prevented, and the control valve and the pipeline can be protected from erosion and damage. The perpendicular arrangement of the bottoms of the first through groove 303 and the second through groove 304 helps to disperse the velocity and pressure of the fluid, reducing the erosion phenomenon that may occur under high-pressure fluid conditions. By effectively reducing the impact and high-speed flow of the fluid, the service life of the control valve and the pipeline can be extended, and the stability and reliability of the system can be improved, which is particularly suitable for working conditions with large pressure drops, such as high-pressure multi-stage systems. Through fine pressure drop control and erosion prevention measures, the valve core through groove 302 can effectively cope with these complex engineering environments and ensure the long-term stable operation of the system.

[0042] As Figure 2 and Figure 3 As shown, in an alternative embodiment of the utility model, the included angle a formed by the first groove wall 321 and the bottom of the valve core through groove 302 is greater than or equal to 30° and less than or equal to 60°, and the included angle b formed by the second groove wall 322 and the bottom of the valve core through groove 302 is greater than or equal to 10° and less than 30°.

[0043] By setting the included angle range formed by the first groove wall 321 and the bottom of the valve core through groove 302, and the included angle range formed by the second groove wall 322 and the bottom of the through groove, the flow and pressure change of the fluid can be effectively controlled, enabling the valve core 32 to smoothly adjust the medium flow rate during movement, reducing the turbulence and eddy current of the fluid in the valve core through groove 302, thereby reducing the noise and vibration of the control valve. The smaller included angle a (greater than or equal to 10° and less than 30°) of the second groove wall 322 allows the fluid to flow more smoothly in the through groove, helping to reduce the formation of pressure waves and eddy currents, and improving the accuracy and stability of fluid control. The larger included angle b (greater than or equal to 30° and less than or equal to 60°) of the first groove wall 321 can more effectively convert the fluid kinetic energy into pressure energy and reduce the wear caused by fluid inertia and friction. Through a reasonable included angle design, the friction between the medium in the valve core through groove 302 and the second groove wall 322 can be reduced, and the wear rate of the control valve components can be lowered. In addition, the included angle design can also reduce the residue of the medium on the surface of the through groove, reducing the risk of corrosion, extending the service life of the control valve, and reducing the maintenance cost.

[0044] AsFigure 1 and Figure 2 As shown in Figure 2 , in an alternative embodiment of the utility model, the intersection line between the second groove wall 322 and the side surface of the valve core 32 is arc-shaped. The arc-shaped intersection line between the second groove wall 322 and the side surface of the valve core 32 can reduce the resistance of the fluid inside the valve cage 31. Compared with a right angle or other shapes, the arc-shaped intersection line can guide the fluid through the second cavity 301 more smoothly, reduce the pressure loss. The arc-shaped intersection line can effectively reduce the stress concentration that may occur at the contact point. Compared with a sharp angle or linear contact, the arc-shaped intersection line helps to evenly distribute the stress, reducing the risk of fatigue damage to the valve core 32 under high pressure or frequent use conditions, reducing the friction and wear with the side surface of the valve core 32, and thus extending the service life of the regulating valve. This is particularly important for regulating valves that are frequently opened and closed and operate for a long time, reducing the frequency and cost of maintenance and component replacement.

[0045] In an alternative embodiment of the utility model, the valve cage 31 is provided with a plurality of diamond-shaped openings, and the plurality of diamond-shaped openings are evenly distributed on the side surface of the valve cage 31. The uniform distribution of the diamond-shaped openings can effectively improve the flow characteristics of the fluid passing through the valve cage 31, reduce the turbulence and eddy currents when the fluid passes through the regulating valve, thereby improving the stability and predictability of fluid control. The geometric shape of the diamond-shaped openings can reduce the pressure loss inside the valve cage 31 without affecting the fluid flow. The uniformly distributed diamond-shaped openings can effectively reduce the noise and vibration generated during fluid flow, reduce the noise level during system operation, and improve the comfort and safety of the operating environment. The structure of the diamond-shaped openings can reduce the wear and corrosion of the valve cage 31 components while maintaining good fluid control, help to extend the service life of the regulating valve, reduce the frequency of maintenance and component replacement, and improve the overall reliability of the regulating valve.

[0046] In an alternative embodiment of the utility model, a gasket of the valve body 1 is provided at the gap where the valve body 1 is connected to the upper valve cover 2. The gasket of the valve body 1 and the gasket of the upper valve cover 2 can effectively fill the connection gap and improve the sealing performance of the regulating valve. By reducing or preventing medium leakage, it helps to ensure that the upper valve cover 2 can be reliably sealed in the closed state, preventing unnecessary fluid loss or environmental pollution. The use of gaskets can reduce the direct metal contact between the valve body 1 and the upper valve cover 2, thereby reducing the friction and wear during operation, helping to extend the service life of the regulating valve, and reducing the maintenance period and repair cost. Gaskets are usually made of materials that are resistant to high temperature and corrosion, and can maintain stability and performance under extreme working conditions. This characteristic enables the regulating valve to adapt to a variety of media and working environments, improving the reliability and operating safety of the system.

[0047] The presence of the gasket simplifies the installation and maintenance processes of the valve body 1 and the upper valve cover 2. They can effectively reduce the adjustment requirements during installation and provide faster disassembly and replacement operations during maintenance, reducing downtime and improving work efficiency. By setting the gaskets for the valve body 1 and the upper valve cover 2, the regulating valve optimizes the sealing performance, reduces friction and wear, enhances the high-temperature and corrosion resistance capabilities, and simplifies the installation and maintenance processes, making it suitable for various industrial application scenarios that require efficient sealing and reliable operation.

[0048] In an alternative embodiment of the utility model, the inner wall of the downstream channel 102 is provided with a chamfer, and the chamfer is located directly below the second cavity 301. By providing the chamfer directly below the second cavity 301, the inner wall of the downstream channel 102 around the second cavity 301 can be smoothed, reducing the resistance of the fluid flowing through the downstream channel 102, which helps to improve the fluid control efficiency of the regulating valve, reduce energy loss, and at the same time reduce the noise and vibration generated during operation. The chamfer can prevent the formation of dead corners or accumulation areas around the lower part of the second cavity 301, thereby reducing the deposition and blockage of dirt or solid particles. Keeping the channel unobstructed helps to extend the service life of the regulating valve and reduce the maintenance frequency and repair costs.

[0049] The position of the chamfer ensures the stable flow of the fluid when passing through the second cavity 301, which helps to improve the control accuracy and stability of the regulating valve and helps to meet the application scenarios that require precise flow or pressure regulation. The chamfer can reduce the pressure fluctuations and impacts in the fluid control system, improve the operation reliability and safety of the regulating valve, reduce the sudden problems in the system, and protect the equipment and pipelines from damage or premature wear. By providing the chamfer on the inner wall of the downstream channel 102 and being located directly below the second cavity 301, the resistance is reduced, accumulation is avoided, the control accuracy is optimized, and the reliability is enhanced, effectively improving the performance and efficiency of the regulating valve in various industrial fluid control applications.

[0050] In an alternative embodiment of the utility model, a first sealing portion is provided between the upper end of the valve core 32 and the inner diameter of the valve cage 31, a second sealing portion is provided between the upper end of the upper valve cover 2 and the valve stem 33, and a third sealing portion is provided between the lower edge of the valve cage 31 and the bottom of the first cavity 103.

[0051] The first sealing portion and the second sealing portion effectively prevent the leakage of the medium and ensure the reliable sealing of the regulating valve in the closed state. The sealing parts between the valve core 32 and the valve cage 31 and between the upper valve cover 2 and the valve stem 33 ensure that the regulating valve can work stably for a long time and reduce the leakage risk. The presence of the sealing components can reduce the direct metal contact between the valve core 32 and the valve cage 31, and between the upper valve cover 2 and the valve stem 33, thereby reducing the frictional losses during operation, helping to extend the service life of the regulating valve, and enhancing the smoothness and reliability of the operation.

[0052] The sealing component is made of corrosion-resistant materials and can resist the corrosion and chemical influence of the medium, thereby improving the durability and stability of the control valve in harsh working environments. The sealing component can make the operation of the control valve more convenient during maintenance or replacement, reducing the maintenance time and cost. By setting the first sealing part between the valve core 32 and the valve cage 31 and the second sealing part between the upper valve cover 2 and the valve stem 33, not only the sealing performance and durability of the control valve are improved, but also the operation experience and maintenance efficiency are improved, which is applicable to various industrial fluid control systems requiring high-efficiency sealing and reliable operation, such as the blowdown system of the steam drum.

[0053] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A regulating valve, characterized in that, Comprising: A valve body, which is provided with an upstream flow channel, a first cavity, and a downstream flow channel that are connected in sequence; An upper valve cover, which is connected to the upper end of the valve body; An internal valve component, which is located at the first cavity; Wherein, the internal valve component includes: A valve cage, which is fixedly designed in the first cavity, and the valve cage is provided with a second cavity, and the second cavity is respectively communicated with the upstream flow channel and the downstream flow channel; A valve seat, which is detachably connected to the bottom of the second cavity; A valve stem, the upper end of which passes through the middle of the upper valve cover; A valve core, which is rotatably arranged in the second cavity and is located between the valve seat and the valve stem, and the diameter of the valve seat is less than or equal to the diameter of the valve core. By rotating the valve core, the flow rates of the upstream flow channel and the downstream flow channel are adjusted.

2. The regulating valve according to claim 1, characterized in that, A plurality of perforated partitions are arranged inside the valve cage, the aperture of the perforated partition matches the diameter of the valve core, and valve core through grooves are provided on both sides of the valve core at certain intervals, and the valve core through grooves are located between two adjacent perforated partitions.

3. The regulating valve according to claim 2, wherein, The groove wall of the valve core through groove includes a first groove wall and a second groove wall. Both ends of the first groove wall are respectively connected to the second groove wall and the bottom of the valve core through groove, and the included angle formed by the first groove wall and the bottom of the valve core through groove is greater than the included angle of the second groove wall.

4. The regulating valve according to claim 3, characterized in that, The valve core through groove includes a first through groove and a second through groove, and the first through groove and the second through groove are arranged alternately along the length direction of the valve core, and the bottom of the first through groove is perpendicular to the bottom of the second through groove.

5. The control valve according to claim 3, characterized in that The included angle formed by the first groove wall and the bottom of the valve core through groove is greater than or equal to 30° and less than or equal to 60°, and the included angle formed by the second groove wall and the bottom of the valve core through groove is greater than or equal to 10° and less than 30°.

6. The regulating valve according to claim 3, characterized in that The intersection line of the second groove wall and the side surface of the valve core is arc-shaped.

7. The control valve according to claim 1, wherein One end of the valve core is rotatably connected to the valve seat through a concave cavity, and the other end of the valve core is connected to the bottom end of the valve stem through a pin.

8. The regulating valve according to claim 1, characterized in that, The valve seat is arranged at the bottom of the second cavity through bolt connection or snap connection, or the valve seat is clamped between the valve cage and the valve core.

9. The regulating valve according to claim 1, wherein A chamfer is arranged on the inner wall of the downstream flow channel, and the chamfer is located directly below the second cavity.

10. The regulating valve according to claim 1, characterized in that, A first sealing part is arranged between the upper end of the valve core and the inner diameter of the valve cage, and a second sealing part is arranged between the upper end of the upper valve cover and the valve stem.

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