Automatic centering frictionless radial hard sealing multi-way valve

Abstract

The application discloses an automatic centering frictionless radial hard sealing multi-way valve, which comprises a valve body, a radial driving device, a valve clapper, a valve seat and a valve seat support ring. The valve body is provided with a radial flow channel, the valve seat support ring is arranged in the flow channel and is used for mounting the valve seat, the valve seat is matched with the valve clapper to realize sealing, the valve clapper is mounted on the radial driving device in the valve body, and the valve seat and the valve seat support ring are in contact with each other in a conical surface and an arc surface mode. When the valve clapper is driven by the radial driving device to press the valve seat, the valve seat is slightly adjusted to ensure that the valve clapper is attached to realize hard sealing. The valve seat and the valve seat support ring are provided with the conical surface and the arc surface structure, so that the valve seat forms a universal joint structure, the sealing failure problem caused by assembly errors or working condition deformation in the traditional fixed mounting mode is solved, the rotary error can be automatically adapted during hard sealing contact to realize good attachment, and the sealing reliability is improved.

Description

Technical Field

[0001] This invention belongs to the technical field of multi-way valves for oil and gas extraction, specifically relating to an automatic centering frictionless radial hard-seal multi-way valve. Background Technology

[0002] High-pressure oil and gas production and transportation metering multi-way valves are crucial equipment for wellhead metering in oil and gas fields. They can replace multi-valve groups for well selection, reducing construction costs and floor space requirements. Due to their compact structure and simple operation, they are particularly suitable for multi-well rotation metering on offshore platforms. Multi-way valves are used for wellhead pipeline metering and are the first critical piece of equipment after raw gas and crude oil enter the surface. Operating under harsh conditions such as high pressure, corrosiveness, sand and gravel content, and condensate oil, they require high levels of safety, sealing, and stability. A low-maintenance multi-way valve is essential for stable oil and gas production.

[0003] Currently, both domestic and international manufacturers produce multi-way valves with radial and axial sealing structures, but soft seals are the dominant type. Soft-seal valve seats are easily worn away by sand and gravel entrained in the medium during use, leading to leakage. Hard-seal valve seats are more stable in the long term, but due to manufacturing difficulties, hard seal technology is currently only used in axial sealing structures; it has not yet been adopted for radial sealing structures. Currently, hard-seal valve seats are mainly used in axial sealing structures, but axial sealing valve seats are larger than radial sealing valve seats, causing inconvenience in installation, transportation, and operation.

[0004] Meanwhile, in all currently applied multi-way valves, the valve disc rotates while remaining in contact with the valve seat during well switching. During rotation, impurities such as sand and gravel in the medium cause significant wear on the sealing surface, leading to seal failure and a short valve disc lifespan. Summary of the Invention

[0005] To overcome the aforementioned shortcomings, the inventors of this invention, through long-term exploration, experimentation, and continuous innovation, have proposed an automatic centering frictionless radial hard-seal multi-way valve. The valve seat and valve seat support ring employ a conical and arc-shaped surface structure, forming a universal joint structure. This solves the problem of sealing failure caused by assembly errors or deformation under working conditions in traditional fixed installation methods. During hard seal contact, it can automatically adapt to rotational errors to achieve good fit and improve sealing reliability.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: An automatic centering frictionless radial hard-seal multi-way valve is provided, comprising a valve body, a radial drive device, a valve disc, a valve seat, and a valve seat support ring. The valve body has a radial flow channel, and a valve seat support ring is disposed within the flow channel. The valve seat support ring is used to install the valve seat. The valve seat and the valve disc cooperate to achieve a seal. The valve disc is installed on the radial drive device inside the valve body. The valve seat and the valve seat support ring are in contact with a conical and arc-shaped surface, so that when the valve disc is driven by the radial drive device to press against the valve seat, the valve seat micro-adjustment position ensures close contact with the valve disc to achieve a hard seal.

[0007] A further preferred embodiment of the automatic centering frictionless radial hard-seal multi-way valve according to the present invention is as follows: at the contact position between the valve seat and the valve seat support ring, the valve seat support ring has a conical surface structure and the valve seat has a convex arc surface structure; at the contact position between the valve seat and the valve seat support ring, the valve seat support ring has a concave arc surface structure and the valve seat has a convex arc surface structure.

[0008] A further preferred technical solution of the automatic centering frictionless radial hard seal multi-way valve according to the present invention is: the valve seat support ring is a conical surface with a taper range of 20°-160°, and the arc of the convex arc surface of the valve seat is in the range of 0.52-2.79.

[0009] A further preferred embodiment of the automatic centering frictionless radial hard-seal multi-way valve according to the present invention is as follows: the radial drive device includes a return spring, a piston cover, a piston, a shaft, and a rotating component. The piston is installed in a piston hole inside the rotating component to form a hydraulic chamber. The piston hole opening is closed by the piston cover. A return spring is provided between the piston and the piston cover. The shaft is connected to the other side of the piston. The shaft passes through the bottom of the piston hole and is connected to the valve disc at its end.

[0010] A further preferred embodiment of the automatic centering frictionless radial hard-seal multi-way valve according to the present invention is as follows: the hydraulic chamber is connected to the flow channel, the flow channel includes a first transverse flow channel on the rotating part and a vertical flow channel that coincides with the axis of the first rotating shaft, and an annular flow divider hole is provided at the upper end of the vertical flow channel, the annular flow divider hole being connected to the pipeline of the external hydraulic mechanism.

[0011] A further preferred embodiment of the automatic centering frictionless radial hard-seal multi-way valve according to the present invention is as follows: the rotating component includes a rotating arm and a valve disc sleeve, the valve disc sleeve is disposed between the valve disc and the rotating arm, the valve disc is slidably installed in the valve disc sleeve and a valve disc sealing structure is provided at the contact position; the rotating arm includes a main body and a first rotating shaft connected above the main body and a second rotating shaft connected below the main body, the first rotating shaft and the second rotating shaft being located on the same axis.

[0012] A further preferred embodiment of the automatic centering frictionless radial hard-seal multi-way valve according to the present invention is as follows: the upper end of the first rotating shaft passes through the valve cover and connects to the valve stem, and then connects to the rotation drive device; the valve cover seals the valve body; and a tapered roller bearing is provided at the contact position between the first rotating shaft and the valve cover.

[0013] A further preferred embodiment of the automatic centering frictionless radial hard-seal multi-way valve according to the present invention is that the sealing structure includes two support rings disposed in the groove of the valve disc sleeve and a double rubber ring structure between the two support rings.

[0014] A further preferred embodiment of the automatic centering frictionless radial hard-seal multi-way valve according to the present invention is that both the valve disc and the valve seat are made of hard alloy.

[0015] A further preferred technical solution of the automatic centering frictionless radial hard-seal multi-way valve according to the present invention is: the valve seat and the valve seat support ring are in contact with a conical surface and an arc-shaped surface to form a universal joint structure. When there is an error in the rotation of the valve disc, the valve seat rotates to mate with the valve disc to achieve complete sealing surface fit.

[0016] Compared with the prior art, the technical solution of the present invention has the following advantages / benefits:

[0017] 1. It solves the problem of needing multiple valve groups to repeatedly switch flow to achieve rotating metering at the wellhead during oil and natural gas extraction. It is simple to operate, has a compact structure, occupies little space, and has obvious cost-effectiveness advantages.

[0018] 2. The valve seat adopts a conical and arc-shaped surface structure between the valve seat and the valve seat support ring, which makes the valve seat form a universal joint structure and give it micro-movement capability. This solves the problem of sealing failure caused by assembly errors or deformation under working conditions in traditional fixed installation methods. When the hard seal is in contact, it can automatically adapt to rotation errors to achieve good fit and improve sealing reliability.

[0019] 3. The use of a universal joint valve seat enables it to fit slightly, compensating for the problem of valve disc and valve seat not fitting completely due to machining errors, and solving the problem that metal-to-metal hard seal is not easy to achieve in the radial sealing structure of this type of valve.

[0020] 4. The valve adopts an embedded controller and a combined electrical and mechanical working mode. When the valve disc rotates, it can disengage from the valve seat, which solves the problem of wear on the sealing surface caused by a large amount of fine sand impurities in the oil and gas produced at the wellhead. It can also achieve good sealing during long-term operation, ensuring the accuracy of wellhead metering and extending the maintenance cycle of the valve from 2-3 years to more than 5 years.

[0021] 5. The torque is generated only by the frictional force between the plug neck and the packing and the medium pressure. There is no large frictional torque of the hard-seal valve seat and the medium force of the valve seat. The smaller torque can also realize the swing arm movement, which can realize the miniaturization of electric actuators and reduce the on-site operating power. Its rotation torque is only 10%-20% of that of other multi-way valves. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a cross-sectional view of an automatic centering frictionless radial hard-seal multi-way valve according to the present invention.

[0024] Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle.

[0025] Figure 3 yes Figure 1 A magnified view of a section at point B.

[0026] The following are the labels in the diagram: 1. Valve body 2. Valve stem 3. Radial drive device 31. Return spring 32. Piston cover 33. Piston 34. Shaft 35. Rotating component 351. Rotating arm 3511. Main body 3512. First rotating shaft 3513. Second rotating shaft 3514. Piston hole 3515. Hydraulic chamber 352. Valve disc sleeve 353. Valve disc sealing structure 4. Valve disc 5. Valve seat 6. Valve seat support ring 7. Valve cover 8. Flow channel 81. First transverse flow channel 82. Vertical flow channel 83. Annular diverter hole 84. Second transverse flow channel. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions in the embodiments of this invention are described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of this invention, not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention. Therefore, the detailed description of the embodiments of this invention provided below is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

[0029] Example 1:

[0030] like Figures 1-3 As shown, this invention discloses an automatic centering frictionless radial hard-seal multi-way valve. It includes a valve body 1, a radial drive device 3, a valve disc 4, a valve seat 5, and a valve seat support ring 6. The valve body 1 has a radial flow channel 8, which serves as an inlet pipeline. The valve seat support ring 6 is disposed within the flow channel 8 and is used to mount the valve seat 5. The valve seat 5 and the valve disc 4 cooperate to achieve a seal. The valve disc 4 is mounted on the radial drive device 3 inside the valve body 1. The valve seat 5 and the valve seat support ring 6 have a conical and arc-shaped surface contact (the arc-shaped surface forms a structure similar to a ball head). When the valve disc 4 is driven by the radial drive device 3 to press against the valve seat 5, the valve seat 5 rotates to engage with the valve disc 4 to ensure a tight fit and achieve a seal. This rotation adaptation process is actually a micro-adjustment of the position, achieving adaptive rotation adjustment of the valve seat 5 position and engagement with the valve disc 4. It is not actually a strict rotation process, but includes changes in angle and automatic adjustment of the contact position. The conical and arc-shaped contact structure continuously and dynamically compensates for minor offsets during the expansion and contraction clamping process after the valve disc 4 has rotated, ensuring that the sealing surface is always in an ideal contact state, significantly improving the sealing stability and consistency under long-term operation. At the same time, this dynamic compensation mechanism effectively reduces the impact of assembly tolerances on sealing performance, lowers the machining accuracy requirements, further enhances the consistency and reliability of mass production, and ensures that the sealing performance meets the Class V sealing requirements of ANSI FCI70.2.

[0031] At the contact point between valve seat 5 and valve seat support ring 6, valve seat support ring 6 has a conical structure and valve seat 5 has a convex arc-shaped structure. The fit between the conical and arc-shaped surfaces not only guides valve seat 5 to self-adaptively rotate and center during the clamping process, but also achieves uniform distribution of contact stress through precise matching of curvature radii, avoiding micro-cracks or wear caused by local overload, and also ensuring the self-sealing between the two parts to prevent media leakage along the mating surface.

[0032] The radial drive device 3 includes a return spring 31, a piston cover 32, a piston 33, a shaft 34, and a rotating component 35. The piston 33 is installed in a piston hole 3514 inside the rotating component 35 to form a hydraulic chamber 3515. The opening of the piston hole 3514 is closed by the piston cover 32. A return spring 31 is provided between the piston 33 and the piston cover 32. The other side of the piston 33 is connected to the shaft 34. The shaft 34 passes through the bottom of the piston hole 3514 and is connected to the valve disc 4 at its end. In fact, the radial drive device 3 only needs to be able to drive the valve disc 4 to extend and retract. Therefore, its specific structure can be flexibly adapted according to the actual working conditions. For example, pneumatic, electric, or electromagnetic drives can be used instead of hydraulic ones. The same applies to the return mechanism. Spring clamping can be omitted, or pneumatic clamping can be used, etc. There are no restrictions here.

[0033] The rotating component 35 includes a rotating arm 351 and a valve disc sleeve 352. The valve disc 4 is disposed between the valve disc sleeve 352 and the rotating arm 351. The valve disc 4 is slidably installed in the valve disc sleeve 352 and a valve disc sealing structure 353 is provided at the contact position. The valve disc sleeve 352 and the interior of the rotating arm 351 together form a shaft mounting space. The shaft 34 is located in the shaft mounting space. In fact, the shaft mounting space also serves as the flow channel 8 of the liquid to be tested. The shaft 34 and the valve disc 4 are installed using mounting columns. The hollowed-out position between the mounting columns serves as the flow channel 8 connecting the inlet pipeline and the test pipeline at the bottom. The rotating component 35 only needs internal space to accommodate the shaft 34 and the guide channel for the movement of the shaft 34. Its structural form can be dynamically optimized according to the type of drive source. For example, it can enhance the airtightness of the airtight cavity when pneumatic, integrate limit and feedback sensors when electric, and adapt the coil layout and magnetic circuit design when electromagnetic. No restrictions are imposed here. All variations adhere to the same underlying logic and have a first rotating shaft 3512 and a second rotating shaft 3513 that are coaxial at both ends. This ensures that the rotation accuracy of the rotating component 35 in the horizontal plane is stable and controllable, and maintains the precise engagement of the sealing surface during multiple operating condition switching.

[0034] The hydraulic chamber 3515 is connected to the flow channel 8. The flow channel 8 includes a first transverse flow channel 81 on the rotating component 35 and a vertical flow channel 82 that coincides with the axis of the first rotating shaft 3512. An annular diversion hole 83 is provided at the upper end of the vertical flow channel 82. The annular diversion hole 83 is connected to the second transverse flow channel 84 on the valve cover 7, and is connected to the pipeline of the external hydraulic mechanism through the second transverse flow channel 84. Seals are provided on the upper and lower sides of the annular diversion hole 83 to prevent hydraulic oil leakage. The annular diversion hole 83 cooperates with the transverse flow channel on the side of the external valve cover 7 to realize the external communication structure with the hydraulic equipment. It should be noted that this hydraulic fluid flow channel is only a relatively good method. In actual applications, a direct-connect quick-connect interface or an embedded micro hydraulic pump module can also be used according to the system integration requirements.

[0035] The rotating arm 351 includes a main body 3511 and a first rotating shaft 3512 connected above the main body 3511 and a second rotating shaft 3513 connected below the main body 3511. The first rotating shaft 3512 and the second rotating shaft 3513 are located on the same axis. The main body 3511 is hollow inside to accommodate the shaft 34. The main body 3511 has a piston hole 3514 for mounting a piston 33. The first rotating shaft 3512 and the second rotating shaft 3513 are arranged coaxially and together form the dual-axis rotation mounting reference of the rotating component 35.

[0036] The upper end of the first rotating shaft 3512 passes through the valve cover 7, connects to the valve stem 2, and then connects to the rotation drive device. The valve cover 7 seals the valve body 1. A tapered roller bearing is installed at the contact position between the first rotating shaft 3512 and the valve cover 7. This bearing reduces the rotational friction of the rotating component 35 and also enables the rotating component 35 to have a self-centering function. The bearing is located at the upper end of the packing assembly of the valve stem 2 and does not contact the medium, thus avoiding medium corrosion.

[0037] The valve disc sealing structure 353 includes two support rings disposed within the groove of the valve disc sleeve 352 and a double rubber ring structure between the two support rings. Of course, this is only one sealing method that meets the usage requirements; other sealing structures that meet the requirements can also be used. Packing seals, dry gas seals, and mechanical seals are all options. The specific type should be selected based on a comprehensive assessment of the requirements. Similarly, other sealing mechanisms in this device can be selected appropriately.

[0038] Both the valve disc 4 and the valve seat 5 are made of hard alloy, forming a radial metal-to-metal hard seal. Hard alloy with stronger physical and chemical properties is overlaid on the contact surface to reduce seal wear and corrosion.

[0039] The valve seat 5 and the valve seat support ring 6 form a universal joint structure with an arc-shaped surface contact. When there is an error in the rotation of the valve disc 4, the valve seat 5 rotates to align with the valve disc 4 to achieve complete sealing surface fit, automatically compensating for deviations (including rotational deviations, machining errors, minor assembly errors, deformation, etc.) to ensure that the sealing surface is always tightly fitted. This universal joint structure also gives the valve seat 5 the ability to self-adjust micro-angle, so that the sealing surface can still maintain sealing contact and uniform pressure under thermal expansion and contraction, assembly deviations, or dynamic loads, greatly improving the long-term sealing reliability under extreme working conditions.

[0040] Technical Comparison: Currently, there are three main types of multi-way valve structures used in engineering applications: 1. Axial hard seal; 2. Axial soft seal; 3. Radial soft seal. While types 1 and 2 solve both hard and soft seat sealing issues, the need for a 90-degree rotating arm on the stopcock results in a larger valve size. Type 3 uses a radial sealing seat, which solves the problem of valve miniaturization, but the soft sealing surface is easily worn by sand and gravel, leading to high maintenance rates. Our company's multi-way valves utilize an innovative universal joint seat structure, solving the radial hard seal problem. This reduces valve size, manufacturing costs, and installation space while meeting performance requirements.

[0041] 2. This valve adopts an integrated electromechanical design, ensuring that the valve disc does not contact the valve seat during rotation, thus preventing wear on the sealing surface caused by impurities such as sand and gravel in the medium. The hard sealing surface, overlaid with cobalt-based alloy, can withstand the erosion of high-speed fluids. The valve maintains a tight seal even under long-term operation, and its low failure rate allows for on-site maintenance cycles exceeding five years. As a key piece of equipment for oil and gas extraction, it ensures the long-term stable operation of oil and gas extraction activities (offshore platforms can accept multi-way valves with soft-seal seats, but 10 sets of soft seals must be provided upon delivery for maintenance and replacement).

[0042] 3. This valve can be operated with a relatively small torque drive device, which can reduce the cost of the electric actuator and save on-site operating power.

[0043] Table 1. Comparative Data on Technical Analysis of Similar Products at Home and Abroad

[0044] As can be seen from Table 1 (Table 1 is a summary of the test report No. WFM202512168 from Zhejiang Provincial Pump and Valve Product Quality Inspection Center), the multi-way valve of the present invention has reached or exceeded the existing multi-way valves in terms of volume, sealing performance, positioning accuracy, driving torque and service life, realizing the design and manufacture of a radial hard seal multi-way valve.

[0045] Example 2:

[0046] Based on Example 1, at the contact position between the valve seat 5 and the valve seat support ring 6, the valve seat support ring has a concave arc surface structure and the valve seat has a convex arc surface structure. The concave arc surface structure and the convex arc surface structure are set in a corresponding or matching manner, so that the valve seat can adaptively adjust its position (fine adjustment) to ensure good sealing performance.

[0047] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0048] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0050] The above are merely preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be considered as limitations on the present invention, and the scope of protection of the present invention should be determined by the scope defined in the claims. For those skilled in the art, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An automatic centering frictionless radial hard-seal multi-way valve, characterized in that, The valve includes a valve body, a radial drive device, a valve disc, a valve seat, and a valve seat support ring. The valve body has a radial flow channel, and the valve seat support ring is disposed within the flow channel. The valve seat support ring is used to install the valve seat. The valve seat and the valve disc cooperate to achieve a seal. The valve disc is installed on the radial drive device inside the valve body. The valve seat and the valve seat support ring have a conical and arc-shaped contact surface, so that when the valve disc is driven by the radial drive device to press against the valve seat, the valve seat can be finely adjusted to ensure a close fit with the valve disc to achieve a hard seal.

2. The automatic centering frictionless radial hard-seal multi-way valve according to claim 1, characterized in that, At the contact point between the valve seat and the valve seat support ring, the valve seat support ring has a conical surface structure and the valve seat has a convex arc surface structure; at the contact point between the valve seat and the valve seat support ring, the valve seat support ring has a concave arc surface structure and the valve seat has a convex arc surface structure.

3. The automatic centering frictionless radial hard-seal multi-way valve according to claim 2, characterized in that, For valve seat support rings with a conical surface and a taper range of 20°-160°, the convex arc surface of the valve seat has an arc range of 0.52-2.

79.

4. The automatic centering frictionless radial hard-seal multi-way valve according to claim 1, characterized in that, The radial drive device includes a return spring, a piston cover, a piston, a shaft, and a rotating component. The piston is installed in a piston hole inside the rotating component to form a hydraulic chamber. The piston hole opening is closed by the piston cover. A return spring is provided between the piston and the piston cover. The shaft is connected to the other side of the piston. The shaft passes through the bottom of the piston hole and is connected to a valve disc at its end.

5. The automatic centering frictionless radial hard-seal multi-way valve according to claim 4, characterized in that, The hydraulic chamber is connected to the flow channel, which includes a first transverse flow channel on the rotating part and a vertical flow channel that coincides with the axis of the first rotating shaft. An annular flow divider hole is provided at the upper end of the vertical flow channel, and the annular flow divider hole is connected to the pipeline of the external hydraulic mechanism.

6. The automatic centering frictionless radial hard-seal multi-way valve according to claim 4, characterized in that, The rotating component includes a rotating arm and a valve disc sleeve. The valve disc sleeve is provided between the valve disc and the rotating arm. The valve disc is slidably installed in the valve disc sleeve and a valve disc sealing structure is provided at the contact position. The rotating arm includes a main body and a first rotating shaft connected above the main body and a second rotating shaft connected below the main body. The first rotating shaft and the second rotating shaft are located on the same axis.

7. The automatic centering frictionless radial hard-seal multi-way valve according to claim 6, characterized in that, The upper end of the first rotating shaft passes through the valve cover and connects to the valve stem before connecting to the rotation drive device. The valve cover seals the valve body, and a tapered roller bearing is installed at the contact position between the first rotating shaft and the valve cover.

8. The automatic centering frictionless radial hard-seal multi-way valve according to claim 6, characterized in that, The sealing structure includes two support rings disposed within the groove of the valve disc sleeve and a double rubber ring structure between the two support rings.

9. The automatic centering frictionless radial hard-seal multi-way valve according to claim 1, characterized in that, Both the valve disc and the valve seat are made of hard alloy.

10. The automatic centering frictionless radial hard-seal multi-way valve according to claim 1, characterized in that, The valve seat and the valve seat support ring are connected by a conical and arc-shaped surface to form a universal joint structure. When there is an error in the rotation of the valve disc, the valve seat rotates to mate with the valve disc to achieve a complete fit of the sealing surfaces.

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