Horizontal valve packing seal dynamic torque testing device

Abstract

A horizontal valve packing seal dynamic torque testing device belongs to the field of valve performance testing, adopts a horizontal arrangement mode, and comprises a sealing system, a power part, a measuring part and a connection transmission part. The sealing system comprises a valve body, a fixing plate, a stuffing box, a sliding bearing sleeve, a space ring, stuffing, a valve rod and a gland, the power part mainly comprises a motor, the measurement part mainly comprises a dynamic torque sensor, and the connection transmission part mainly comprises couplings, bearings, corresponding bearing supports and a change-over valve rod. When a dynamic torque test is carried out, the motor transmits power to the power end of the dynamic torque sensor through the change-over valve rod to drive the valve rod to rotate; friction torque is generated between the valve rod and the filler in the rotating process and is measured through the dynamic torque sensor. The device can truly simulate the working state of the horizontal valve, can achieve high-precision dynamic torque measurement, is high in adaptability, is compatible with various filler types, has an efficient and adjustable simulation function, and can effectively prolong the service life.

Description

Technical Field

[0001] This invention belongs to the field of valve performance testing and relates to a horizontal valve packing seal dynamic torque testing device. Background Technology

[0002] In industrial production, valves, as key components of fluid control systems, are widely used in various fields such as petrochemicals, power generation, metallurgy, water supply and drainage, and pharmaceuticals. Horizontal valves, in particular, often face complex operating conditions due to their unique structure and operating environment. These valves typically need to operate under high pressure, high temperature, or corrosive media, and the performance of the packing seal system is especially crucial to the valve's stability and safety.

[0003] Packing seals, as a traditional method of valve sealing, remain widely used in various fields due to their excellent wear resistance, pressure resistance, and adaptability. However, in practical applications, the performance of packing seals is affected by multiple factors, with torque being a key one. Excessive torque can cause valve opening and closing sluggishness. Currently, although some packing seal torque testing equipment exists, most have shortcomings. Existing testing devices typically fail to fully simulate the various operating conditions valves may encounter in actual use, especially the operating environment of horizontal valves. Furthermore, existing equipment struggles to accurately test dynamic torque at different speeds under actual operating conditions and cannot adapt to packing seal systems of different sizes and structures. Therefore, an ideal testing scheme for the dynamic testing of horizontal valve packing seals remains lacking. Specifically, the existing technical problems include:

[0004] (1) Lack of simulation of real working conditions: Existing testing devices are often arranged vertically or in other ways that do not conform to actual usage, and cannot realistically simulate the actual working conditions of horizontal valves. The rotation mode, friction force, and dynamic response of horizontal valves during operation are often different from other types of valves. Therefore, if the design of the testing device cannot simulate the actual working conditions of horizontal valves, its test results may not accurately reflect the performance of the packing seal system under real working conditions.

[0005] (2) Insufficient dynamic torque measurement: Current testing equipment mainly focuses on static testing or simplified dynamic testing, which cannot comprehensively evaluate the dynamic performance of valve packing seal system under different speeds and operating conditions. Especially during the valve opening and closing process, the dynamic torque generated by the packing seal changes with the speed. Existing equipment has difficulty capturing multiple dynamic information such as torque, angle, and rotation speed at the same time, resulting in the inability to accurately evaluate the performance of the sealing system under different operating conditions.

[0006] (3) Poor adaptability: Different types of valve packing seal systems have different structures and dimensions, and existing testing equipment often cannot adapt to various types of packing as needed. For example, some devices have a narrow adjustment range for the size of the stuffing box, the length of the spacer ring, and the packing clamping force, making it difficult to test packings with different structures or sizes. Therefore, existing equipment is not adaptable to a wide range of valve packing seal systems. Summary of the Invention

[0007] To address the problems existing in the prior art, this invention provides a horizontal valve packing seal dynamic torque testing device, which can test the torque generated by a horizontally installed valve packing seal system. Specifically, the technical problems it solves include:

[0008] (1) At present, most valves are installed horizontally in the pipeline system. By arranging them horizontally, the actual working state of valves installed horizontally can be simulated, and the packing torque can be measured.

[0009] (2) The dynamic torque of the valve at different speeds can be measured by the dynamic torque sensor and its built-in angle sensor, and the relationship between the valve rotation angle and torque can be obtained. The number of valve rotations can also be recorded.

[0010] (3) By adjusting the axial length of the spacer ring, it can be adapted to fillers with different structures and sizes.

[0011] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0012] A horizontal valve packing seal dynamic torque testing device is disclosed. The device is arranged horizontally, with the valve placed horizontally and the valve stem extending horizontally. The testing device mainly includes a sealing system, a power unit, a measurement unit, and a connection and transmission unit. The sealing system includes a valve body 1, a fixing plate 19, a stuffing box 3, a sliding bearing sleeve 21, a spacer 22, packing 23, a valve stem 7, and a gland 4. Pipe interfaces 2 are connected to both sides of the valve body 1, allowing for pressurization of the valve body 1. The bottom of the valve body 1 is connected to the fixing plate 19 by bolts. The stuffing box 3 is designed based on common sealing stuffing box structures, consisting of a top cylinder and a rear flange structure. It has a through cavity divided into two sections: one section near the top cylinder has a smaller inner diameter and is mainly used to house the sliding bearing sleeve 21; the other section has a relatively larger inner diameter and is mainly used to house the spacer 22 and packing 23. When the stuffing box 3 is arranged horizontally, its top cylindrical end is welded to the valve body 1, and its flange end is connected to the gland 4 via studs 6 and nuts 5. The sliding bearing sleeve 21 provides radial support for the valve stem 7, bearing the radial load generated by the valve stem 7 during operation, ensuring its smooth rotation and reducing vibration and sway. The spacer 22 is located between the sliding bearing sleeve 21 and the packing 23, which not only has an isolation effect but also provides axial support for the packing 23 when the gland 4 applies pressure to it. The packing 23 fills the annular gap between the valve stem 7 and the inner cavity of the stuffing box 3. By pre-tightening the studs 6 and nuts 5, the gland 4 presses the packing 23 axially, causing the packing 23 to deform radially, thereby enhancing its fit with the valve stem 7 and the inner cavity of the stuffing box 3, forming a tight contact, and thus achieving a sealing effect.

[0013] The power unit of the device mainly includes a motor 17 and a motor bracket 18 connected to it, which mainly provides power to the system.

[0014] The measuring part of the device mainly includes a dynamic torque sensor 11 and a bracket 12 connected to it, which mainly measures information such as dynamic torque.

[0015] The connection and transmission part of the device mainly includes various couplings, various bearings and corresponding bearing supports, as well as the conversion valve stem 20, which mainly serves the function of connection and transmission.

[0016] The valve stem 7 consists of two cylindrical sections. One cylindrical section, with a larger diameter, is mainly installed in the internal cavity of the stuffing box 3 and connected to the valve body 1. The other cylindrical section, with a smaller diameter, is connected sequentially to the first bearing 8 and the first coupling 10, and then connected to the load end of the dynamic torque sensor 11 via the first coupling 10. The first bearing 8 provides radial support for the valve stem 7 and is connected to the first bearing bracket 9 by bolts. The first bearing bracket 9 is connected to the fixing plate 19 by bolts.

[0017] The dynamic torque sensor 11 is connected to the bracket 12 by bolts, and the bracket 12 is connected to the fixing plate 19 by bolts. The dynamic torque sensor 11 mainly includes a load end and a power end, wherein the load end is used to connect to the components on the valve sealing packing system side, and the power end is used to connect to the components on the motor side. Here, the power end of the dynamic torque sensor 11 is connected to the switching valve stem 20 through the second coupling 13. The second bearing 14 provides radial support for the switching valve stem 20. The second bearing 14 is connected to the second bearing bracket 15 by bolts, and the second bearing bracket 15 is connected to the fixing plate 19 by bolts.

[0018] The switching valve stem 20 is a short cylindrical rod. The middle part of the rod is installed in the second bearing 14. Its two ends are connected to the power end of the dynamic torque sensor 11 and the motor 17 through the second coupling 13 and the third coupling 16, respectively. The motor 17 is connected to the motor bracket 18 by bolts, and the motor bracket 18 is connected to the fixing plate 19 by bolts.

[0019] The motor 17 drives the valve stem 7 to rotate via the third coupling 16, the switching valve stem 20, the second coupling 13, the dynamic torque sensor 11, and the first coupling 10. Since the valve stem 7 passes through the stuffing box 3, and the packing 23 fills the annular space between the valve stem 7 and the inner cavity of the stuffing box 3, tightly wrapping the valve stem in a ring shape, frictional torque is generated between the valve stem 7 and the packing 23 when the valve stem 7 rotates. This frictional torque can be measured by the dynamic torque sensor 11. By adjusting the power of the motor 17, the output speed of the motor 17 can be adjusted, thereby simulating the opening and closing speeds of different valves.

[0020] Furthermore, the dynamic torque sensor 11 has a built-in angle sensor. Driven by the motor 17, the dynamic torque sensor 11 rotates coaxially with the valve stem 7, and can measure the valve stem torque, rotation angle, rotation speed, and number of rotations in real time.

[0021] Furthermore, the spacer 22 determines the position of the packing 23 within the stuffing box 3, serving as an axial positioning element and isolating the packing 23 from the sliding bearing sleeve 21, ensuring the stability and reliability of the entire sealing structure. In addition, different types of packing 23 may have different physical properties such as compressibility and thickness. By replacing spacers 22 of different thicknesses or structural forms, the space within the stuffing box 3 can be adjusted to accommodate packing 23 of varying thicknesses, ensuring appropriate compression after installation and achieving a good sealing effect. This also allows for torque testing of various types of packing 23.

[0022] The process of using this invention is as follows:

[0023] The horizontal valve packing seal dynamic torque testing device provided by this invention mainly includes a sealing system, a power unit, a measurement unit, and a connection and transmission unit. During dynamic torque testing, the motor 17 of the power unit transmits power to the switching valve stem 20 mounted on the second bearing 14 via a third coupling 16. The switching valve stem 20 then transmits power to the power end of the dynamic torque sensor 11 via a second coupling 13. Through the internal structure of the sensor, power is further transmitted to the valve stem 7 at its load end via a first coupling 10, thereby driving the valve stem 7 to rotate. During rotation, the valve stem 7 generates frictional torque with the packing 23, which can be measured by the dynamic torque sensor 11. Furthermore, by adjusting the power of the motor 17, the output speed of the motor 17 can be adjusted, thereby simulating the opening and closing speeds of different valves and obtaining dynamic torque information under different operating conditions.

[0024] The horizontal valve packing seal dynamic torque testing device provided by this invention has significant advantages over existing technologies in several aspects, mainly reflected in the following aspects:

[0025] (1) This invention can realistically simulate the working state of horizontal valves: This invention adopts a horizontal arrangement, which effectively simulates the state of valves in actual working environments. Currently, most industrial valves are installed on horizontal pipelines during actual operation, with the valve stem and valve body passage in a horizontal direction. The rotation of the valve stem is around a horizontal axis. This horizontal arrangement can restore the actual working state of the valve, eliminate test interference caused by gravity and installation direction, and ensure that the contact state between the packing and the valve stem, the force distribution, and the medium action are consistent with reality. It can realistically reproduce the actual working conditions of horizontal valves under high pressure, high temperature, or corrosive media, thereby providing more accurate and reliable test results. This advantage can ensure that the dynamic performance of the packing sealing system under real working conditions is fully evaluated, avoiding the errors caused by the discrepancy between the test environment and the actual working state in the prior art.

[0026] (2) This invention enables high-precision dynamic torque measurement: The invention introduces a dynamic torque sensor and a built-in angle sensor, enabling real-time and accurate measurement of the dynamic torque, rotation angle, rotation speed, and number of rotations of the valve packing seal system at different speeds. Through this technology, the testing device can comprehensively record torque changes during the valve's start-up, operation, and closing processes, thereby achieving a comprehensive analysis and evaluation of the packing seal system's performance. This dynamic measurement capability is unattainable by existing technologies, greatly improving testing accuracy and reliability.

[0027] (3) This invention has strong adaptability and is compatible with various packing types: By adjusting the thickness and structure of the spacer ring, the device of this invention can be adapted to packings of different structures and sizes. Whether it is standard-sized packing or packing with special structures, it can be made compatible through simple adjustments, making the device widely applicable and able to meet the testing requirements of different valves and packing sealing systems. This advantage effectively solves the problem that existing devices cannot adapt to various packing types, and expands the application range of the device.

[0028] (4) This invention features efficient and adjustable simulation capabilities: The invention drives the valve stem to rotate via a motor, and the motor's power and output speed can be adjusted to simulate the opening and closing speeds of different valves. Users can precisely control the valve's operating speed according to different testing requirements, thereby obtaining dynamic torque data under different operating conditions. This feature allows the device to be used not only for standard testing in a laboratory environment but also to flexibly adjust testing conditions according to actual needs.

[0029] (5) Simple Device Structure and Maintenance of the Invention: The design of the invention has a high degree of structural integration. Through the optimized configuration of components such as couplings, bearings, and sensors, the device structure is simple and easy to maintain. The various components are connected through standardized interfaces, ensuring the reliability of the system and convenient maintenance. In particular, the design of core components such as valve bodies, stuffing boxes, and dynamic torque sensors takes into account long-term stability and durability during use, effectively extending the service life of the device. Attached Figure Description

[0030] Figure 1 A three-dimensional diagram of a horizontal valve packing seal dynamic torque testing device provided by the present invention;

[0031] Figure 2 This is a front view of a horizontal valve packing seal dynamic torque testing device provided by the present invention;

[0032] Figure 3 This is a top view of a horizontal valve packing seal dynamic torque testing device provided by the present invention.

[0033] Figure 4This is a cross-sectional view of the valve body and stuffing box of a horizontal valve packing seal dynamic torque testing device provided by the present invention.

[0034] Figure 5 This is a schematic diagram of the valve body structure;

[0035] Figure 6 This is a schematic diagram of the stuffing box structure;

[0036] Figure 7 This is a schematic diagram of the spacer structure;

[0037] Figure 8 This is a schematic diagram of the bearing sleeve structure;

[0038] Figure 9 This is a schematic diagram of the gland structure.

[0039] In the diagram: 1 Valve body, 2 Pipeline interface, 3 Stuffing gland, 4 Gland, 5 Nut, 6 Double-ended stud, 7 Valve stem, 8 First bearing, 9 First bearing bracket, 10 First coupling, 11 Dynamic torque sensor, 12 Bracket, 13 Second coupling, 14 Second bearing, 15 Second bearing bracket, 16 Third coupling, 17 Motor, 18 Motor bracket, 19 Fixing plate, 20 Converter valve stem, 21 Sliding bearing sleeve, 22 Spacer, 23 Packing. Detailed Implementation

[0040] The valve body 1 is the core component of this device, with pipe interfaces 2 connected to both sides. Pipe interfaces 2 are connected to an external fluid pressurization system via pipes, allowing pressure to be applied to the valve body 1. This pressurization simulates the internal fluid pressure of the valve during operation, thus more realistically reflecting the performance of the packing seal system. The bottom of the valve body 1 is bolted to a fixing plate 19, ensuring the valve body is firmly fixed and will not move during testing, guaranteeing testing accuracy and stability.

[0041] The stuffing box 3 consists of a top cylinder and a rear flange structure, with an internal through cavity divided into two sections. The section near the top cylinder has a smaller inner diameter and is primarily used to house the sliding bearing sleeve 21; the other section has a relatively larger inner diameter and is primarily used to house the spacer ring 22 and packing 23. When arranged horizontally, the top cylindrical end of the stuffing box 3 is welded to the valve body 1, while the flange end is connected to the gland 4 via double-ended studs 6 and nuts 5. The stuffing box 3 contains, in sequence, the sliding bearing sleeve 21, the spacer ring 22, and the packing 23. The sliding bearing sleeve 21 provides radial support for the valve stem 7, bearing the radial load generated during operation, ensuring smooth rotation, reducing vibration and sway, and effectively reducing frictional resistance. The spacer 22 is located between the sliding bearing sleeve 21 and the packing 23, not only providing isolation but also providing axial support for the packing 23 when the gland 4 applies pressure, preventing loosening or displacement of the packing 23 during use and ensuring a sealing effect. The packing 23 fills the annular gap between the valve stem 7 and the inner cavity of the stuffing box 3, forming a sealing interface that effectively prevents fluid leakage. By pre-tightening the double-ended studs 6 and nuts 5, the gland 4 axially presses the packing 23, causing radial deformation of the packing 23, thereby enhancing its fit with the valve stem 7 and the inner cavity of the stuffing box 3, forming a tight contact, and further improving the sealing effect.

[0042] The valve stem 7 consists of two cylindrical sections. One section, with a larger diameter, is mainly installed inside the stuffing box 3 and connected to the valve body 1. The other section, with a smaller diameter, is connected sequentially to the first bearing 8 and the first coupling 10, and then to the load end of the dynamic torque sensor 11 via the first coupling 10. This coupling provides a mechanical connection between the valve stem 7 and the dynamic torque sensor 11, ensuring synchronous rotation during operation. The first bearing 8 provides radial support for the valve stem 7, reducing friction and rotational errors, and ensuring smooth rotation of the valve stem. The first bearing 8 is bolted to the first bearing bracket 9, which in turn is bolted to the fixing plate 19, ensuring that the bearing and valve stem do not shift during rotation.

[0043] The dynamic torque sensor 11 is bolted to the bracket 12, which in turn is bolted to the fixing plate 19. The fixing plate 19 serves as a support component, ensuring the stability of the entire sensor system. The dynamic torque sensor 11 mainly comprises a load end and a power end. The load end connects to components on the valve sealing packing system side, while the power end connects to components on the motor side. Here, the power end of the dynamic torque sensor 11 is connected to the switching valve stem 20 via a second coupling 13, enabling the torque sensor 11 to transmit the measured torque data to the downstream measurement system. The second bearing 14 provides radial support for the switching valve stem 20, reducing errors caused by friction. The second bearing 14 is bolted to the second bearing bracket 15, ensuring smooth operation of the switching valve stem. The second bearing bracket 15 is bolted to the fixing plate 19, further enhancing the system's stability.

[0044] The switching valve stem 20 is a short cylindrical rod. The middle part of the rod is installed in the second bearing 14. Its two ends are connected to the power end of the dynamic torque sensor 11 and the motor 17 through the second coupling 13 and the third coupling 16, respectively. The motor 17 is connected to the motor bracket 18 by bolts, and the motor bracket 18 is connected to the fixing plate 19 by bolts.

[0045] Motor 17 serves as the drive source for the entire device, driving valve stem 7 to rotate via a coupling. Motor 17 controls its output speed by adjusting its power, thereby simulating the opening and closing speeds of different valves. The motor speed can be precisely adjusted according to different testing requirements, enabling the device to perform torque tests under various valve operating conditions. In this way, users can simulate the opening and closing process of valves under different operating conditions and test the dynamic performance of the packing seal system under various operating conditions. Driven by motor 17, valve stem 7 begins to rotate, generating frictional torque between it and packing 23. This frictional torque can be measured by dynamic torque sensor 11, thereby obtaining dynamic performance data about the packing seal system.

[0046] The dynamic torque sensor 11 incorporates an angle sensor, enabling real-time measurement of the torque, rotation angle, rotation speed, and number of rotations of the valve stem 7. When the motor 17 drives the valve stem 7 to rotate, the dynamic torque sensor 11 rotates synchronously with the valve stem 7. Through the angle sensor, the sensor captures the angle of valve stem rotation and records it along with the torque data, providing a complete dynamic performance curve.

[0047] By replacing the spacers 22 with different thicknesses and structural forms, various types and sizes of packing 23 can be adapted. Different types of packing will have different effects on the torque of the valve. Therefore, the spacers can be replaced according to actual needs to adapt to different types of packing sealing systems and test their dynamic torque performance under different operating conditions.

[0048] To ensure that the packing 23 maintains an effective sealing state during operation, this device uses pre-tightened double-ended studs 6 and nuts 5 to achieve the downward pressing effect of the gland 4 on the packing. Adjusting the tightening force of the nut 5 can change the degree of compression of the packing 23, thereby affecting the sealing effect of the packing. By adjusting this pressure, the sealing performance of the packing under different operating conditions can be simulated, further verifying the performance of the packing system under different pressures and temperatures.

[0049] The above embodiments are merely illustrative of the implementation methods of the present invention, but should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the protection scope of the present invention.

Claims

1. A dynamic torque testing device for horizontal valve packing seals, characterized in that, The horizontal valve packing seal dynamic torque testing device adopts a horizontal arrangement, that is, the valve is placed horizontally in the testing device and the valve stem extends in the horizontal direction; the horizontal valve packing seal dynamic torque testing device includes a sealing system, a power unit, a measurement unit and a connection and transmission unit; The sealing system includes a valve body (1), a fixing plate (19), a stuffing box (3), a sliding bearing sleeve (21), a spacer (22), packing (23), a valve stem (7), and a gland (4); The power unit includes a motor (17) and a motor bracket (18) connected thereto, which provides power; The measuring part includes a dynamic torque sensor (11) and a bracket (12) connected thereto, for measuring dynamic torque information; The connection and transmission part includes various couplings, various bearings and corresponding bearing supports, as well as a conversion valve stem (20), which plays the role of connection and transmission. The couplings include a first coupling (10), a second coupling (13), and a third coupling (16), and the bearings include a first bearing (8) and a second bearing (14). During dynamic torque testing, the motor (17) of the power unit transmits power to the switching valve stem (20) mounted on the second bearing (14) through the third coupling (16). The switching valve stem (20) then transmits power to the power end of the dynamic torque sensor (11) through the second coupling (13). Through the action of the internal structure of the sensor, the power is further transmitted to the valve stem (7) through the first coupling (10) at its load end, causing the valve stem (7) to rotate. During the rotation, the valve stem (7) generates frictional torque with the packing (23), which is measured by the dynamic torque sensor (11). By adjusting the power of the motor (17), the output speed of the motor (17) can be adjusted, thereby simulating the opening and closing speed of different valves and obtaining dynamic torque information under different working conditions.

2. The horizontal valve packing seal dynamic torque testing device according to claim 1, characterized in that, In the sealing system: The valve body (1) is connected to the pipeline through the pipeline interface (2) on both sides to realize the pressurization operation of the valve body (1). The bottom of the valve body (1) is installed on the fixing plate (19). The stuffing box (3) is composed of a top cylinder and a flange structure at the tail. The sliding bearing sleeve (21), spacer (22), and packing (23) are placed inside. When the stuffing box (3) is arranged horizontally, its top cylindrical end is connected to the valve body (1), and the flange structure end is connected to the gland (4) through double-ended studs (6) and nuts (5). The sliding bearing sleeve (21) provides radial support for the valve stem (7). The packing (23) fills the annular gap between the valve stem (7) and the inner cavity of the stuffing box (3). By pre-tightening the double-ended studs (6) and nuts (5), the gland (4) presses the packing (23) axially, causing the packing (23) to undergo radial deformation, enhancing its fit with the valve stem (7) and the inner cavity of the stuffing box (3), and achieving a sealing effect.

3. The horizontal valve packing seal dynamic torque testing device according to claim 2, characterized in that, The stuffing box (3) has a through cavity inside, which is divided into two sections. The cavity with a small inner diameter near the top cylinder is used to place the sliding bearing sleeve (21); the cavity with a relatively large inner diameter is used to place the spacer (22) and the packing (23).

4. The horizontal valve packing seal dynamic torque testing device according to claim 2, characterized in that, The spacer (22) is located between the sliding bearing sleeve (21) and the packing (23), which serves as an isolation effect and can provide axial support for the packing (23) when the gland (4) applies pressure to the packing (23).

5. The horizontal valve packing seal dynamic torque testing device according to claim 1, characterized in that, The valve stem (7) consists of two cylindrical sections. One cylindrical section has a large diameter and is installed in the internal cavity of the stuffing box (3) and connected to the valve body (1). The other cylindrical section has a small diameter and is connected to the first bearing (8) and the first coupling (10) in sequence, and is connected to the load end of the dynamic torque sensor (11) through the first coupling (10). The first bearing (8) provides radial support for the valve stem (7) and is mounted on the fixed plate (19) through the first bearing bracket (9).

6. The horizontal valve packing seal dynamic torque testing device according to claim 1, characterized in that, The dynamic torque sensor (11) is connected to the bracket (12), and the bracket (12) is connected to the fixed plate (19). The dynamic torque sensor (11) includes a load end and a power end, wherein the load end is used to connect to the valve sealing packing system, and the power end is used to connect to the motor. Here, the power end is also connected to the switching valve stem (20) through the second coupling (13). The second bearing (14) provides radial support for the switching valve stem (20), and the second bearing (14) is mounted on the fixed plate (19) through the second bearing bracket (15).

7. A horizontal valve packing seal dynamic torque testing device according to claim 6, characterized in that, The dynamic torque sensor (11) has a built-in angle sensor. Driven by the motor (17), the dynamic torque sensor (11) rotates coaxially with the valve stem (7) and can measure the valve stem torque, rotation angle, rotation speed and number of rotations in real time.

8. The horizontal valve packing seal dynamic torque testing device according to claim 1, characterized in that, The switching valve stem (20) is a cylindrical rod. The middle part of the cylindrical rod is installed in the second bearing (14). Its two ends are connected to the power end of the dynamic torque sensor (11) and the motor (17) through the second coupling (13) and the third coupling (16), respectively. The motor (17) is mounted on the fixed plate (19) through the motor bracket (18).

9. The horizontal valve packing seal dynamic torque testing device according to claim 1, characterized in that, The motor (17) drives the valve stem (7) to rotate through the third coupling (16), the switching valve stem (20), the second coupling (13), the dynamic torque sensor (11), and the first coupling (10).

10. A horizontal valve packing seal dynamic torque testing device according to claim 1, characterized in that, The spacer ring (22) can determine the position of the packing (23) in the stuffing box (3), play the role of axial positioning, and can isolate the packing (23) from the sliding bearing sleeve (21); By replacing the spacers (22) of different thicknesses or structural forms, the space inside the stuffing box (3) can be adjusted to accommodate packings (23) of different thicknesses, thereby achieving a seal and enabling torque testing of various types of packings (23).

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