High-density medium control valve

Abstract

The utility model discloses a high-density medium control valve, which relates to the field of cut-off devices, and comprises a shell, three openings are arranged on the surface of the shell, the shell is of a hollow structure, a flow channel inside the shell is used for high-density media to flow, and the openings on two sides of the shell are respectively an inlet and an outlet; the top cover is communicated with the opening in the middle of the shell, and the top cover is of a tubular structure; the opening and closing element is arranged in an inner cavity of the top cover, the outer wall of the opening and closing element is of a coaxial cylindrical structure, the opening and closing element is of a hollow structure, hydraulic oil is arranged in an inner cavity of the opening and closing element, a piston is arranged between the hydraulic oil and the high-density medium, and an oil injection hole and a plug are arranged on the side, away from the piston, of the opening and closing element; and the driving mechanism is connected with the opening and closing element and used for driving the opening and closing element to reciprocate along the axis of the top cover. According to the high-density medium control valve, through the built-in piston and the hydraulic oil filling cavity, the working pressure load generated when the opening and closing element moves is effectively eliminated, and the reliability is improved.

Description

Technical Field

[0001] This utility model relates to the field of shut-off device technology, and more specifically, to a high-density media control valve. Background Technology

[0002] A cutting-off device is a device used to cut off fluids (such as liquids, gases, etc.) or solid materials, and is widely used in industrial production, machining, energy transmission and other fields.

[0003] Currently, various types of shut-off devices are used in industrial applications, including ball valves, gate valves, wedge gate valves, and knife gate valves.

[0004] Cut-off devices have a wide range of applications, and their design and working principle vary depending on the specific application scenario. However, their core function is to reliably cut off fluids or materials, ensuring system safety and production efficiency.

[0005] For existing valves, the bottom opening and closing element contains a piston structure with a through hole and threaded plug. This component directly contacts the working medium, which may lead to plug failure and internal liquid leakage. Simultaneously, the spring connecting the piston and the support ring, a critical connecting component within the opening and closing element, suffers from insufficient structural strength and is prone to connection failure; furthermore, the piston stroke lacks a mechanical limit device, posing a risk of structural damage during valve operation. In addition, the conical valve seat is continuously eroded by the working medium, accelerating the wear of the sealing surface and resulting in a significant decrease in sealing performance.

[0006] In conclusion, improving the reliability of the cutting device is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0007] In view of this, the purpose of this utility model is to provide a high-density medium control valve. The valve's opening and closing element is provided with hydraulic oil in its inner cavity. The pressure of the high-density medium on the piston can be buffered by the hydraulic oil, which can eliminate the working pressure load when the opening and closing element moves. The oil injection hole is located on the side of the opening and closing element away from the piston to prevent the plug from failing.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A high-density media control valve, comprising:

[0010] The shell has three openings on its surface. The shell is a hollow structure and its internal flow channel is used for the flow of high-density media. The openings on both sides of the shell are the inlet and the outlet, respectively.

[0011] The top cover is connected to the opening in the middle of the housing, and the top cover is a tubular structure.

[0012] An opening and closing element is provided in the inner cavity of the top cover. The outer wall of the opening and closing element is a coaxial cylindrical structure. The opening and closing element is a hollow structure. The inner cavity of the opening and closing element is filled with hydraulic oil. A piston is provided between the hydraulic oil and the high-density medium. The opening and closing element is provided with an oil injection hole and a plug on the side away from the piston.

[0013] A drive mechanism is connected to the opening and closing element, and the drive mechanism is used to drive the opening and closing element to reciprocate along the axis of the top cover.

[0014] Preferably, the opening and closing element includes an upper cylindrical section and a lower cylindrical section. The inner diameter of the upper cylindrical section is 0.9 to 1.1 times the outer diameter of the lower cylindrical section. The upper cylindrical section is provided with a top flange, and the lower cylindrical section is provided with the piston. The top flange is connected to the driving mechanism.

[0015] Preferably, a fixed inner flange is provided inside the connection between the upper cylindrical section and the lower cylindrical section, a fifth sealing element is provided between the inner flange and the upper cylindrical section, the hydraulic oil is provided between the piston and the inner flange, the oil injection hole is located in the middle of the inner flange, and a removable plug is provided at the oil injection hole.

[0016] Preferably, the inner flange is provided with a guide seat facing the piston, the guide seat is provided with a fixed bushing connected to the piston, and an elastic element is provided between the fixed bushing and the guide seat.

[0017] Preferably, the piston has a fixing plate on its surface, a through hole in the middle of the fixing plate, a fixing bushing passing through the through hole, and a groove for installing a fourth seal on the outer periphery of the piston, the fourth seal being located between the piston and the fixing plate.

[0018] Preferably, the top cover has a top cover flange on the side opposite to the housing, the top cover flange is detachably connected to the end face flange, and the end face flange is connected to the inner flange through a support member.

[0019] Preferably, the drive mechanism includes a valve stem and a handwheel. The valve stem is fixedly connected to the upper cylindrical section through the top flange. The top flange is provided with a threaded hole, and the outer periphery of the valve stem is provided with an external thread corresponding to the threaded hole.

[0020] Preferably, the flow channel is provided with a hollow positioning bushing, the top of the hollow positioning bushing is provided with a perforation, the side of the hollow positioning bushing is provided with an inlet hole, the bottom of the hollow positioning bushing is a spherical section, the spherical section is provided with a spherical valve seat, the inner circumference of the top perforation of the hollow positioning bushing is provided with an annular upper inner cavity, the outer circumference is provided with an annular upper outer cavity, the upper inner cavity is provided with a first sealing element, and the upper outer cavity is provided with a second sealing element.

[0021] Preferably, the flow channel is provided with an inner flange, and a third sealing element is provided between the hollow positioning bushing and the inner flange.

[0022] Preferably, the connection between the top cover and the housing is provided with a top cover flange, and the inner circumference of the top cover flange is provided with an annular protrusion, which is used to press the hollow positioning bushing.

[0023] This utility model provides a high-density medium control valve. The valve housing has three openings, with the two ends being the inlet and outlet, respectively. A top cover is provided at the middle opening, and an opening / closing element is provided inside the top cover. The opening / closing element is connected to a drive mechanism, which can drive the opening / closing element to reciprocate along the axis of the top cover to realize the opening or closing of the valve. Hydraulic oil is provided in the inner cavity of the opening / closing element. A piston is provided between the hydraulic oil and the high-density medium in the housing. An oil injection hole and a plug are provided on the side of the opening / closing element away from the piston. Hydraulic oil can be injected into the opening / closing element through the oil injection hole. During the flow of the high-density medium in the flow channel, the pressure of the high-density medium acts on the surface of the piston, and the force is transmitted to the inner end face of the opening / closing element through the hydraulic oil, thereby avoiding piston damage and failure and improving structural reliability. In addition, since the oil injection hole and the plug are located on the side of the opening / closing element away from the piston, they are not affected by the high-density medium, which can improve the reliability of the structure. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0025] Figure 1 This is a cross-sectional view of the high-density media control valve provided by this utility model in the open state.

[0026] Figure 2 This is a cross-sectional view of the high-density media control valve provided by this utility model in the closed state;

[0027] Figure 3 This is a cross-sectional view of the upper cylindrical segment and the lower cylindrical segment provided by this utility model;

[0028] Figure 4 This is a cross-sectional view of the opening and closing element provided by this utility model;

[0029] Figure 5 This is a schematic diagram of the hollow positioning bushing provided by this utility model.

[0030] Figure label:

[0031] 1-Housing; 2-Inlet; 3-Outlet; 4-Opening / closing element; 5-Upper cylindrical section; 6-Lower cylindrical section; 7-Top flange; 8-Valve stem; 9-Handwheel; 10-Flow channel; 11-Hollow positioning bushing; 12-Inlet hole; 13-Spherical section; 14-Upper inner cavity; 15-First seal; 16-Second seal; 17-Upper outer cavity; 18-Top cover flange; 19-Top cover; 20-Inner flange; 21-Third seal; 22-Piston; 23-Fourth seal; 24-Fixed bushing; 25-Elastic element; 26-Inner flange; 27-Fifth seal; 28-Support element; 29-End face flange; 30-Top cover upper flange; 31-Oil injection hole; 32-Plug; 33-Hydraulic oil; 34-Spherical valve seat. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] The core of this utility model is to provide a high-density medium control valve. The valve's opening and closing element is equipped with hydraulic oil, and the oil injection hole is located on the side of the opening and closing element away from the piston. The hydraulic oil can apply the pressure of the high-density medium to the surface of the piston and transmit the force to the inner end face of the opening and closing element, thereby avoiding piston damage and failure and improving structural reliability.

[0034] It should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", and "rear" is based on the orientation or positional relationship shown in the accompanying drawings and is only for the purpose of facilitating the description of this application and simplifying the description. It is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0035] This application provides a high-density media control valve, comprising: a housing 1, a top cover 19, an opening and closing element 4, and a drive mechanism;

[0036] The shell 1 has three openings on its surface. The shell 1 is a hollow structure and its internal flow channel 10 is used for the flow of high-density medium. The openings on both sides of the shell 1 are the inlet 2 and the outlet 3, respectively.

[0037] The top cover 19 is connected to the opening in the middle of the housing 1, and the top cover 19 is a tubular structure;

[0038] The opening and closing element 4 is located in the inner cavity of the top cover 19. The outer wall of the opening and closing element 4 is a coaxial cylindrical structure. The opening and closing element 4 is a hollow structure. The inner cavity of the opening and closing element 4 is provided with hydraulic oil 33. A piston 22 is provided between the hydraulic oil 33 and the high-density medium. The opening and closing element 4 is provided with an oil injection hole 31 and a plug 32 on the side away from the piston 22.

[0039] The drive mechanism is connected to the opening and closing element 4 and is used to drive the opening and closing element 4 to reciprocate along the axis of the top cover 19.

[0040] For details, please refer to the appendix. Figure 1 With appendix Figure 2 The interior of the housing 1 has a roughly Z-shaped flow channel 10. Besides the inlet 2 and outlet 3 at both ends of the flow channel 10, a third opening is located in the middle of the housing 1. A top cover 19 is mounted on this middle opening. The top cover 19 is a tubular structure with its central axis aligned vertically. An opening / closing element 4 is located inside the top cover 19. A drive mechanism connected to the opening / closing element 4 is located above it. The drive mechanism can move the opening / closing element 4 vertically. When the drive mechanism moves the opening / closing element 4 downwards until it contacts the inner cavity of the housing 1, it can cut off the flow of the high-density medium in the flow channel 10. Conversely, when the drive mechanism moves the opening / closing element 4 upwards, it can... The flow channel 10 is used to facilitate the flow of high-density media. In addition, a piston 22 is provided below the opening and closing element 4, and hydraulic oil 33 is provided in the inner cavity of the opening and closing element 4. An oil injection hole 31 and a plug 32 are provided in the middle of the opening and closing element 4. Hydraulic oil can be introduced into the opening and closing element 4 through the oil injection hole 31. After the oil injection is completed, the oil injection hole 31 can be closed through the plug 32. During the flow of high-density media in the flow channel 10, the pressure on the piston 22 can be distributed to the inner cavity of the opening and closing element 4 through the hydraulic oil 33. In addition, since the oil injection hole 31 is not provided on the piston 22, the high-density media will not come into contact with the plug 32, preventing the plug from failing and thus improving the reliability of the structure.

[0041] Based on the above embodiments, the opening and closing element 4 includes an upper cylindrical section 5 and a lower cylindrical section 6. The inner diameter of the upper cylindrical section 5 is 0.9 to 1.1 times the outer diameter of the lower cylindrical section 6. The upper cylindrical section 5 is provided with a top flange 7, and the lower cylindrical section 6 is provided with a piston 22. The top flange 7 is connected to the drive mechanism.

[0042] Specifically, the opening and closing element 4 is divided into upper and lower sections, namely, an upper cylindrical section 5 and a lower cylindrical section 6. Both the upper cylindrical section 5 and the lower cylindrical section 6 are tubular structures and are fixedly connected. The inner diameter of the upper cylindrical section 5 is 0.9 to 1.1 times the outer diameter of the lower cylindrical section 6, and it is necessary to ensure that the outer diameter of the upper cylindrical section 5 is larger than the outer diameter of the lower cylindrical section 6 so that a limiting part can be formed on the outer periphery of the opening and closing element 4. A top flange 7 is also provided above the opening and closing element 4. Please refer to the appendix. Figure 3The top flange 7 is bolted to the upper cylindrical section 5, and the drive mechanism can move the opening and closing element 4 in the vertical direction by driving the top flange 7.

[0043] Based on the above embodiment, a fixed inner flange 26 is provided inside the connection between the upper cylindrical section 5 and the lower cylindrical section 6. A fifth sealing element 27 is provided between the inner flange 26 and the upper cylindrical section 5. Hydraulic oil 33 is provided between the piston 22 and the inner flange 26. An oil injection hole 31 is provided in the middle of the inner flange 26. A removable plug 32 is provided at the oil injection hole 31.

[0044] For details, please refer to the appendix. Figure 4 An inner flange 26 is provided at the bottom of the upper cylindrical section 5. The outer diameter of the inner flange 26 is the same as the inner diameter of the upper cylindrical section 5 to prevent the inner flange 26 from falling into the lower cylindrical section 6. An oil injection hole 31 is provided in the middle of the inner flange 26. Hydraulic oil 33 can be injected between the inner flange 26 and the piston 22 through the oil injection hole 31. The plug 32 is a threaded plug. After the oil injection is completed, the threaded plug can achieve a seal between the inner flange 26 and the piston 22. A fifth sealing element 27 is provided between the inner flange 26 and the upper cylindrical section 5. The fifth sealing element 27 is used to prevent hydraulic oil leakage.

[0045] Based on the above embodiment, the inner flange 26 is provided with a guide seat facing the piston 22, the guide seat is provided with a fixed bushing 24 connected to the piston 22, and an elastic member 25 is provided between the fixed bushing 24 and the guide seat.

[0046] For details, please refer to the appendix. Figure 4 A guide seat is bolted to the inner flange 26. The guide seat is a tubular structure that extends downward. A fixing bushing 24 is provided on its inner side. The lower end of the fixing bushing 24 is fixed to the upper surface of the piston 22. An elastic element 25 is provided between the fixing bushing 24 and the guide seat. The elastic element 25 can buffer the movement of the piston 22 in the lower cylindrical section 6 to ensure structural stability.

[0047] Optionally, the elastic element 25 can be a spring.

[0048] Based on the above embodiment, the piston 22 is provided with a fixing plate on its surface, a through hole in the middle of the fixing plate, a fixing bushing 24 passing through the through hole, and a groove for installing a fourth seal 23 on the outer periphery of the piston 22. The fourth seal 23 is located between the piston 22 and the fixing plate.

[0049] Specifically, the upper surface edge of the piston 22 is provided with a groove, and the fourth seal 23 is provided in the groove. The upper surface of the piston 22 is provided with a fixing plate, and the middle of the fixing plate is provided with a through hole through which the fixing bushing 24 can pass. The fixing plate is connected to the piston 22 by bolts. The end face of the fixing bushing 24 that contacts the piston 22 is provided with a flange. The fourth seal 23 and the fixing bushing 24 can be fixed by bolts.

[0050] Based on the above embodiment, the top cover 19 is provided with a top cover flange 30 on the side opposite to the housing 1. The top cover flange 30 is detachably connected to the end face flange 29, and the end face flange 29 is connected to the inner flange 26 through the support member 28.

[0051] Specifically, the top of the top cover 19 is provided with a top cover flange 30, and the surface of the top cover 19 is fastened with an end face flange 29. The top cover flange 30 and the end face flange 29 are detachably connected by bolts. The end face flange 29 is fixedly connected to the support member 28 by bolts. The support member 28 abuts against the inner flange 26 so that the inner flange 26 can be pressed at the connection between the upper cylindrical section 5 and the lower cylindrical section 6, so that the volume of the cavity where the hydraulic oil 33 is located is relatively stable, ensuring structural stability.

[0052] Based on the above embodiment, the drive mechanism includes a valve stem 8 and a handwheel 9. The valve stem 8 is fixedly connected to the upper cylindrical section 5 through a top flange 7. The top flange 7 is provided with a threaded hole, and the outer periphery of the valve stem 8 is provided with an external thread corresponding to the threaded hole.

[0053] Specifically, the valve stem 8 has an external thread on its outer circumference, and the top flange 7 has a threaded hole in the middle. The upper end of the valve stem 8 is connected to the handwheel 9. Rotating the handwheel 9 can drive the valve stem 8 to rotate, thus driving the top flange 7 to move back and forth in the vertical direction. Similarly, it can drive the opening and closing element 4 to move in the vertical direction. The opening or closing of the opening and closing element 4 only requires the driving energy to overcome the frictional resistance of the sealing element.

[0054] Based on the above embodiment, a hollow positioning bushing 11 is provided in the flow channel 10. The top of the hollow positioning bushing 11 is provided with a perforation, and the side of the hollow positioning bushing 11 is provided with an inlet hole 12. The bottom of the hollow positioning bushing 11 is a spherical section 13. A spherical valve seat 34 is provided on the spherical section 13. The radius of the spherical valve seat 34 is R. In other words, a semicircle with a radius of R can fit exactly with the spherical valve seat 34. The inner circumference of the top perforation of the hollow positioning bushing 11 is provided with an annular upper inner cavity 14, and the outer circumference is provided with an annular upper outer cavity 17. A first sealing element 15 is provided in the upper inner cavity 14, and a second sealing element 16 is provided in the upper outer cavity 17.

[0055] Specifically, the structure of the hollow positioning bushing 11 can be found in the attached diagram. Figure 5The upper part of the valve body is provided with a perforation that can communicate with the top cover 19. The lower part is a spherical section 13 with a through hole in the middle to connect the flow channel 10. The inner circumference of the spherical section 13 is a spherical valve seat 34. The opening and closing element 4 can move downward through the upper perforation until it abuts against the spherical valve seat 34 to cut off and close the valve. The first sealing element 15 and the second sealing element 16 can prevent the high-density medium in the flow channel 10 from entering the top cover 19 and ensure the airtightness of the valve body. That is, a segmented spherical sealing structure is configured, and a reliable seal is achieved by the valve plate edge contacting the spherical surface.

[0056] Based on the above embodiment, the flow channel 10 is provided with an inner flange 20, and a third sealing element 21 is provided between the hollow positioning bushing 11 and the inner flange 20.

[0057] For details, please refer to the appendix. Figure 1 The interior of the flow channel 10 is provided with an inner flange 20 extending towards the inlet 2 and upward. A third seal 21 is provided between the hollow positioning bushing 11 and the inner flange 20 to prevent the high-density medium in the flow channel 10 from leaking from the gap between the hollow positioning bushing 11 and the housing 1.

[0058] Based on the above embodiment, the connection between the top cover 19 and the housing 1 is provided with a top cover flange 18, and the inner circumference of the top cover flange 18 is provided with an annular protrusion, which is used to press the hollow positioning bushing 11.

[0059] For details, please refer to the appendix. Figure 1 The bottom of the top cover 19 is provided with an annular protrusion. The outer diameter of the annular protrusion is the same as the diameter of the top opening of the housing 1. When the top cover 19 is installed on the top of the housing 1, the annular protrusion can press against the top of the hollow positioning bushing 11 to prevent the hollow positioning bushing 11 from shaking when the high-density medium flows, thus ensuring structural stability.

[0060] Based on this, the working principle of the valve provided in this application will be explained:

[0061] The operator injects hydraulic oil 33 into the cavity formed by the lower cylindrical section 6 of the opening / closing element 4, the piston 22, and the inner flange 26 through the oil injection hole 31. At this time, the inner flange 26 and the piston 22 must maintain a minimum distance, and the piston 22 should be at the minimum distance from the edge of the lower cylindrical section 6 of the opening / closing element 4. After the hydraulic oil 33 is filled, the oil injection hole 31 is sealed by the threaded plug 32.

[0062] When the valve is in the "open" position, the opening / closing element 4 is at its maximum stroke limit (see attached diagram). Figure 2In this context, 's' represents the working stroke of the opening / closing element 4. At this time, the working medium (a high-viscosity liquid or a liquid containing impurities) washes over the edge of the lower cylindrical section 6 of the opening / closing element 4; simultaneously, the medium pressure acts on the end face of the piston 22, and the pressure is transmitted to the inner cavity of the opening / closing element 4 through the internal hydraulic oil 33.

[0063] The opening / closing element 4 employs a hollow bushing structure consisting of two mating cylindrical sections, where the inner diameter of the upper cylindrical section 5 is approximately equal to the outer diameter of the lower cylindrical section 6. The working medium pressure acts on the end face of the lower cylindrical section 6 and the piston 22, transmitting the force to the inner end face of the opening / closing element 4 and the inner flange 26 via hydraulic oil. The force transmitted by the external medium pressure through the piston 22 achieves mechanical balance with the internal reaction force, and the sealing device between the inner flange 26 and the piston 22 ensures valve sealing. Operating the opening / closing element 4 requires only overcoming the frictional resistance of the seals and the minimum force required for component movement to close the valve.

[0064] When the valve flow path is cut off, the drive mechanism moves the opening and closing element 4 along the central axis of the top cover 19 and the hollow positioning bushing 11 until the lower cylindrical section 6 of the opening and closing element 4 forms a sealing contact with the spherical valve seat 34. During this process, based on the volume difference (pressure difference) generated by the stepped structure of the opening and closing element 4 itself, the piston 22 is displaced within the cylindrical cavity of the opening and closing element 4, and the elastic element 25 acts as a buffer during this process. At this time, the valve is in the "closed" state.

[0065] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0066] The high-density media control valve provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A high-density media control valve, characterized in that, include: The shell (1) has three openings on its surface. The shell (1) is a hollow structure and its internal flow channel (10) is used for the flow of high-density medium. The openings on both sides of the shell (1) are the inlet (2) and the outlet (3). The top cover (19) is connected to the opening in the middle of the shell (1), and the top cover (19) is a tubular structure; The opening and closing element (4) is located in the inner cavity of the top cover (19). The outer wall of the opening and closing element (4) is a coaxial cylindrical structure. The opening and closing element (4) is a hollow structure. The inner cavity of the opening and closing element (4) is provided with hydraulic oil (33). A piston (22) is provided between the hydraulic oil (33) and the high-density medium. The opening and closing element (4) is provided with an oil injection hole (31) and a plug (32) on the side away from the piston (22). A drive mechanism is connected to the opening and closing element (4), and the drive mechanism is used to drive the opening and closing element (4) to reciprocate along the axis of the top cover (19).

2. The high-density media control valve according to claim 1, characterized in that, The opening and closing element (4) includes an upper cylindrical section (5) and a lower cylindrical section (6). The inner diameter of the upper cylindrical section (5) is 0.9 to 1.1 times the outer diameter of the lower cylindrical section (6). The upper cylindrical section (5) is provided with a top flange (7), and the lower cylindrical section (6) is provided with the piston (22). The top flange (7) is connected to the drive mechanism.

3. The high-density media control valve according to claim 2, characterized in that, A fixed inner flange (26) is provided inside the connection between the upper cylindrical section (5) and the lower cylindrical section (6). A fifth sealing element (27) is provided between the inner flange (26) and the upper cylindrical section (5). The hydraulic oil (33) is provided between the piston (22) and the inner flange (26). The oil injection hole (31) is located in the middle of the inner flange (26). A detachable plug (32) is provided at the oil injection hole (31).

4. The high-density media control valve according to claim 3, characterized in that, The inner flange (26) is provided with a guide seat facing the piston (22), and the guide seat is provided with a fixed bushing (24) connected to the piston (22), and an elastic element (25) is provided between the fixed bushing (24) and the guide seat.

5. The high-density media control valve according to claim 4, characterized in that, The piston (22) has a fixing plate on its surface, and a through hole in the middle of the fixing plate. The fixing bushing (24) passes through the through hole. The piston (22) has a groove on its outer periphery for installing a fourth seal (23). The fourth seal (23) is located between the piston (22) and the fixing plate.

6. The high-density media control valve according to claim 5, characterized in that, The top cover (19) is provided with a top cover flange (30) on the side opposite to the housing (1). The top cover flange (30) is detachably connected to the end face flange (29). The end face flange (29) is connected to the inner flange (26) through a support member (28).

7. The high-density media control valve according to claim 6, characterized in that, The drive mechanism includes a valve stem (8) and a handwheel (9). The valve stem (8) is fixedly connected to the upper cylindrical section (5) through the top flange (7). The top flange (7) is provided with a threaded hole, and the outer periphery of the valve stem (8) is provided with an external thread corresponding to the threaded hole.

8. The high-density media control valve according to any one of claims 1 to 7, characterized in that, The flow channel (10) is provided with a hollow positioning bushing (11). The top of the hollow positioning bushing (11) is provided with a perforation. The side of the hollow positioning bushing (11) is provided with an inlet hole (12). The bottom of the hollow positioning bushing (11) is a spherical section (13). A spherical valve seat (34) is provided on the spherical section (13). The inner circumference of the top perforation of the hollow positioning bushing (11) is provided with an annular upper inner cavity (14), and the outer circumference is provided with an annular upper outer cavity (17). The upper inner cavity (14) is provided with a first sealing element (15), and the upper outer cavity (17) is provided with a second sealing element (16).

9. The high-density media control valve according to claim 8, characterized in that, The flow channel (10) is provided with an inner flange (20), and a third sealing element (21) is provided between the hollow positioning bushing (11) and the inner flange (20).

10. The high-density media control valve according to claim 9, characterized in that, The connection between the top cover (19) and the housing (1) is provided with a top cover flange (18), and the inner circumference of the top cover flange (18) is provided with an annular protrusion, which is used to press the hollow positioning bushing (11).

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