High seal internal thread stop valve

Abstract

The utility model relates to a high sealing internal thread stop valve in the field of stop valve, including valve body and valve cover, the inside of valve body is provided with flow channel, the inside of flow channel forms has stop structure, is provided with through -hole on stop structure, the valve cover is detachably connected with the valve flap through the valve rod, and the end of valve rod is provided with the connecting end, and the connecting end holds the seal cover and is connected, the outer surface of valve flap forms first sealing surface, second sealing surface and third sealing surface, the surface of stop structure is provided with sealing recess, and the edge of seal cover forms the sealing protrusion of with sealing recess and inserts the assembly pair, the utility model discloses through first sealing surface, second sealing surface and third sealing surface three -fold sealing on the valve flap, increase effective sealing area and strengthen the leakproofness, and through sealing recess and sealing protrusion form the assembly pair of inserting, build second sealing barrier at the junction of valve cover and stop structure, further reduce the clearance leakage of medium from the sealed contact surface, improve the reliability of sealing.

Description

Technical Field

[0001] This utility model relates to the field of gate valves, specifically to a high-sealing internal thread gate valve. Background Technology

[0002] Gate valves, as key control devices that achieve fluid cutoff or regulation through the raising and lowering of the valve disc, are widely used in pipeline systems and are fundamental components in the field of fluid control. Their core function is to use the valve stem to drive the valve disc to form a sealing fit with the valve seat, blocking the flow of media and ensuring the safe operation of the system and leak-free media transmission. Internally threaded gate valves, as a subtype of gate valves, offer advantages in space-constrained pipeline layouts and frequent disassembly and maintenance scenarios due to their internal thread connection (threads machined on the inner wall of the valve body for direct screwing to externally threaded pipe fittings), enabling rapid installation and a compact structure.

[0003] The basic structure of an internally threaded gate valve typically consists of a valve body, valve cover, valve stem, valve disc, valve seat, and sealing packing. The valve body has an internal flow channel; the valve cover is fixed to the valve body with bolts, forming a chamber to accommodate the valve stem; the valve stem passes through the valve cover, with a handle or drive device at the top and a fixed connection to the valve disc at the bottom; the valve disc moves axially along the flow channel under the axial drive of the valve stem, and its sealing surface fits against the sealing surface of the valve seat to form a hard seal, blocking the flow of media; the valve stem and valve cover are sealed with packing to prevent media leakage along the valve stem.

[0004] However, existing internal thread gate valves still have certain defects. Among them, the valve disc often adopts a simple inverted conical structure, and the contact between its outer surface and the sealing surface of the valve seat through hole is a line contact or a small area surface contact. The uneven distribution of the contact surface leads to a poor sealing effect, affecting the sealing performance and reliability of the gate valve. In addition, traditional valve discs and valve stems are mostly rigidly connected. Existing valve discs generally use rigid contact sealing. Long-term high-frequency opening and closing will aggravate the wear of the valve disc and affect the sealing effect. At the same time, the existing valve stem and valve disc are installed with a snap-fit ​​rigid connection, making it difficult to disassemble and replace the valve disc, which affects the use. Therefore, there is an urgent need for an internal thread gate valve with high sealing performance and convenient valve disc disassembly and replacement. Utility Model Content

[0005] The purpose of this utility model is to solve the above-mentioned defects and provide a high-sealing internal thread gate valve to solve the technical problem in the background art of how to improve the sealing performance of the gate valve and the convenient disassembly and replacement of the valve disc, thereby enhancing the performance.

[0006] The objective of this utility model is achieved through the following means:

[0007] A high-sealing internal threaded gate valve includes a valve body and a valve cover. The valve body has an internal flow channel communicating with the outside, and inlet and outlet ports communicating with the flow channel are located on both sides of the valve body. A gate structure is formed inside the flow channel, and a through hole is provided on the gate structure to connect the inlet and outlet ports. A valve disc for sealing the through hole and isolating the flow channel is detachably connected to the valve cover via a valve stem. The valve cover has a threaded hole coaxial with the through hole. The valve stem is connected to the threaded hole via a threaded portion, allowing the valve stem to drive the valve disc to move up and down relative to the through hole. A connecting end is provided at the end of the valve stem near the flow channel, and a sealing cap is engaged with the connecting end. An internal mounting groove is provided, and a connecting post is formed in the middle of the mounting groove. The outer surface of the connecting post is provided with a threaded structure. A connecting hole for mating and passing through the connecting post is provided in the middle of the valve disc. A first sealing surface for tightly fitting with the inner wall of the through hole is formed on the outer surface of the valve disc. An inclined fitting surface is provided at the end of the through hole near the valve disc. A second sealing surface for tightly contacting the fitting surface is formed on the outer surface of the valve disc. A third sealing surface for fitting with the surface of the stop structure is formed on the valve disc. A sealing groove is provided on the surface of the stop structure. A sealing protrusion for inserting and fitting with the sealing groove is formed on the edge of the sealing cover. A clamping nut for clamping the valve disc is connected to the end of the connecting post away from the mounting groove through a threaded structure.

[0008] Furthermore, as described above, the outer side of the connecting end is provided with a snap-fit ​​groove, the surface of the sealing cover is provided with a mating protrusion, the mating protrusion is provided with a mating hole for insertion and assembly with the connecting end, and the end of the mating protrusion near the connecting end is bent to snap-fit ​​with the snap-fit ​​groove.

[0009] The valve stem and sealing cover are stably connected by a snap-fit ​​structure with a snap-fit ​​groove and a mating protrusion, ensuring the firmness and reliability of the connection between the valve stem and the sealing cover.

[0010] By setting a sealing cap to connect the valve disc, the phenomenon of wear and loosening caused by the hard connection between the valve disc and the valve stem in traditional rigid connections is avoided. At the same time, the matching connection between the connecting post of the sealing cap and the valve disc can improve the convenience of valve disc replacement and ensure the maintenance efficiency and long-term reliability of the sealing structure.

[0011] Furthermore, as described above, both ends of the valve body are provided with threaded mounting holes for connecting with pipelines, the valve cover is provided with mounting nuts, and the end of the valve stem passes through the mounting nuts and is connected to a handwheel.

[0012] The threaded mounting holes at both ends of the valve body enable standardized docking with pipelines. Combined with the design of the mounting nut and handwheel rotation, this ensures convenient installation and easy operation, reduces installation and operation difficulty, and improves efficiency.

[0013] Furthermore, as described above, a clamping washer is provided between the clamping nut and the valve disc, and the clamping washer has a sleeve hole for the connecting post to pass through. The outer diameter of both the clamping nut and the clamping washer is smaller than the inner diameter of the through hole.

[0014] The clamping gasket passes through the connecting post via the sleeve hole. With the clamping nut designed with an outer diameter smaller than the inner diameter of the through hole, it allows for smooth avoidance when the valve stem rotates and descends, preventing component jamming and reducing the risk of mechanical wear during disassembly and assembly. At the same time, the clamping gasket enhances the sealing contact between the valve disc and the connecting post and mounting groove, improving the sealing and firmness of the valve disc installation.

[0015] Furthermore, as described above, a positioning flange is formed at one end of the valve disc, the outer diameter of the positioning flange is matched with the mounting groove, a third sealing surface is formed on the surface of the positioning flange, a conical protrusion is formed on the positioning flange, a second sealing surface is formed on the outer surface of the conical protrusion, a raised sealing portion is formed at the end of the conical protrusion away from the positioning flange, and a first sealing surface is formed on the outer surface of the sealing portion.

[0016] The three-stage sealing surface design (first sealing surface, second sealing surface, and third sealing surface) of the positioning flange, tapered protrusion, and sealing part forms a three-dimensional sealing structure, which expands the contact area between the valve disc and the inner wall of the through hole, solves the problem of uneven sealing and mediocre sealing effect caused by traditional contact, and improves the sealing performance and isolation reliability of the gate valve through uniformly distributed sealing contact.

[0017] Furthermore, as described above, the sealing protrusion is arranged around the edge of the sealing cover and extends towards the surface of the stop structure. The mounting groove is provided on the sealing cover, and the valve disc is paired with the mounting groove through the positioning flange. The height of the sealing protrusion is greater than the height of the positioning flange, so that the end of the sealing protrusion is paired with the sealing groove for insertion.

[0018] The annular sealing protrusion on the edge of the sealing cap and the sealing groove on the surface of the stop structure are fitted together to form an annular sealing barrier, which enhances the sealing stability between the sealing cap and the stop structure and prevents fluid from leaking from the sealing cap through the valve disc. At the same time, the height design of the sealing protrusion ensures a tight fit with the sealing groove, improving the overall sealing durability and reliability.

[0019] Furthermore, as described above, the inner wall and the mating surface of the through hole are arranged in a trapezoidal shape with the cross-section of the upper surface of the stop structure.

[0020] The trapezoidal cross-section structure of the inner wall of the through hole and the contact surface, along with the upper surface of the stop structure, forms a complementary sealing surface with the conical protrusion of the valve disc, thereby forming a trapezoidal seal, enhancing the sealing performance of the sealing contact, and improving the sealing effect.

[0021] Furthermore, as described above, the cut-off structure includes a lower water-blocking part, an upper water-blocking part, and a cut-off part. The lower water-blocking part protrudes towards the valve stem and is formed on the bottom wall of the flow channel. The upper water-blocking part protrudes towards the bottom wall of the flow channel. The cut-off part connects the lower water-blocking part and the upper water-blocking part, and the cut-off part is horizontally arranged.

[0022] The segmented structure of the lower water-blocking section, the upper water-blocking section, and the horizontal stop section enhances the structural strength and stability of the stop valve. The horizontal stop section provides a uniform sealing reference surface, which effectively matches the multi-stage sealing surface of the valve disc, improving sealing reliability and stop-blocking effect, and solving the sealing failure problem caused by traditional single-point sealing.

[0023] The beneficial effects of this utility model are as follows: A triple seal is achieved through the close contact between the first sealing surface on the valve disc and the inner wall of the through hole, the surface contact between the second sealing surface and the contact surface, and the contact between the third sealing surface and the upper surface of the stop structure. This achieves multi-directional contact of the sealing surfaces, reduces single-point wear, increases the effective sealing area, and reduces the risk of media penetration. Furthermore, the sealing groove on the surface of the stop structure and the sealing protrusion on the edge of the sealing cover form an insert fitting, creating a second sealing barrier at the connection between the valve cover and the stop structure. This further reduces media leakage from the gaps in the sealing contact surfaces, significantly improving the sealing reliability and durability of the stop isolation. It solves the problem of poor sealing effect of the traditional simple inverted conical valve disc sealing surface, improving high-sealing performance. The valve stem connection end is connected to the sealing cover by a clamping mechanism, and the connecting column passes through the valve disc connection hole, with the threaded locking connection of the pressure nut forming a detachable structure. This ensures a stable connection between the valve disc and the valve stem while allowing for quick separation of the valve disc by removing the pressure nut, enabling convenient disassembly and replacement of the valve disc, thereby enhancing the performance. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of this embodiment;

[0025] Figure 2 This is a cross-sectional view of this embodiment;

[0026] Figure 3 This is a schematic diagram of the internal structure of this embodiment;

[0027] Figure 4 for Figure 3 A magnified view of part A in the diagram;

[0028] Figure 5 This is a structural breakdown diagram of this embodiment;

[0029] Figure 6 for Figure 5 A magnified view of part B in the diagram;

[0030] The reference numerals in the figure are as follows:

[0031] 100-Valve body, 101-Flow channel, 102-Through hole, 103-Mating surface, 104-Sealing groove, 105-Lower water baffle, 106-Upper water baffle, 107-Stop part, 108-Threaded mounting hole;

[0032] 200 - Valve cover, 201 - Threaded hole;

[0033] 300 - Valve stem, 301 - Threaded part, 302 - Connecting end;

[0034] 400-Valve disc, 401-Connecting hole, 402-First sealing surface, 403-Second sealing surface, 404-Third sealing surface, 405-Positioning flange, 406-Conical protrusion, 407-Sealing part;

[0035] 500-Sealing cap, 501-Mounting groove, 502-Connecting post, 503-Threaded structure, 504-Sealing protrusion, 505-Mating protrusion, 506-Mating hole;

[0036] 600 - Compression nut; 700 - Compression washer; 800 - Handwheel; 900 - Mounting nut. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0038] To make the technical problem to be solved, the technical solution and the beneficial effects of this utility model clearer, the following describes the solution in further detail with reference to the accompanying drawings and embodiments.

[0039] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" 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 scheme 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 application.

[0040] In this embodiment, refer to Figures 1-6The present invention relates to a high-sealing internal thread stop valve, comprising a valve body 100 and a valve cover 200. The valve body 100 has an internal flow channel 101 communicating with the outside, and inlet and outlet ports communicating with the flow channel 101 are located on both sides of the valve body 100. A stop structure is formed inside the flow channel 101, and a through hole 102 for connecting the inlet and outlet ports is provided on the stop structure. The valve cover 200 is detachably connected to a sealing element via a valve stem 300. A valve disc 400 with a through hole 102 and a flow channel 101 is isolated. A threaded hole 201 coaxially aligned with the through hole 102 is provided on the valve cover 200. A threaded portion 301 connects the valve stem 300 to the threaded hole 201, allowing the valve stem 300 to drive the valve disc 400 to move up and down relative to the through hole 102. A connecting end 302 is provided at the end of the valve stem 300 near the flow channel 101, and a sealing cap 500 is held and connected to the connecting end 302. The valve disc 400 has an internal mounting groove 501, a connecting post 502 in the middle of the mounting groove 501, a threaded structure 503 on the outer surface of the connecting post 502, a connecting hole 401 in the middle of the valve disc 400 for mating and passing through the connecting post 502, a first sealing surface 402 in the outer surface of the valve disc 400 for tightly fitting with the inner wall of the through hole 102, an inclined fitting surface 103 in the end of the through hole 102 near the valve disc 400, a second sealing surface 403 in close contact with the fitting surface 103 in the outer surface of the valve disc 400, and a third sealing surface 404 in contact with the surface of the stop structure. A sealing groove 104 is formed on the surface of the stop structure, and a sealing protrusion 504 is formed on the edge of the sealing cover 500 for insertion and fitting with the sealing groove 104. A clamping nut 600 for clamping the valve disc 400 is connected to the end of the connecting post 502 away from the mounting groove 501 through the threaded structure 503.

[0041] The outer side of the connecting end 302 is provided with a snap-fit ​​groove, and the surface of the sealing cover 500 is provided with a mating protrusion 505. The mating protrusion 505 is provided with a mating hole 506 for insertion and assembly with the connecting end 302, and the end of the mating protrusion 505 near the connecting end 302 is bent to snap-fit ​​with the snap-fit ​​groove.

[0042] The valve stem 300 and the sealing cover 500 are stably connected by the snap-fit ​​groove and the mating protrusion 505, ensuring the firmness and reliability of the connection between the valve stem 300 and the sealing cover 500.

[0043] By setting a sealing cover 500 to connect the valve disc 400, the phenomenon of wear and loosening caused by the hard connection between the valve disc 400 and the valve stem 300 during opening and closing, which is caused by the traditional rigid connection, is avoided. At the same time, the matching connection between the connecting post 502 of the sealing cover 500 and the valve disc 400 can improve the convenience of valve disc 400 replacement and ensure the maintenance efficiency and long-term reliability of the sealing structure.

[0044] Both ends of the valve body 100 are provided with threaded mounting holes 108 for connecting with pipes. The valve cover 200 is provided with mounting nuts 900. The end of the valve stem 300 passes through the mounting nuts 900 and is connected to a handwheel 800.

[0045] The threaded mounting holes 108 at both ends of the valve body 100 enable standardized docking with the pipeline. Combined with the rotating operation design of the mounting nut 900 and handwheel 800, the overall installation is convenient and easy to operate, reducing the difficulty of installation and operation and improving the efficiency of use.

[0046] Specifically, a packing and a packing cover are provided between the mounting nut 900 and the valve cover 200. This is a conventional sealing structure used in the connection between the mounting nut 900 and the valve cover 200 in gate valves in this field, and will not be described in detail here.

[0047] A clamping washer 700 is provided between the clamping nut 600 and the valve disc 400. The clamping washer 700 has a sleeve hole for the connecting post 502 to pass through. The outer diameter of both the clamping nut 600 and the clamping washer 700 is smaller than the inner diameter of the through hole 102.

[0048] The clamping gasket 700 passes through the connecting post 502 via the sleeve hole. It is designed to work with the clamping nut 600, whose outer diameter is smaller than the inner diameter of the through hole 102. This design allows for smooth avoidance when the valve stem 300 rotates and descends, preventing parts from jamming and reducing the risk of mechanical wear during disassembly and assembly. At the same time, the clamping gasket 700 enhances the sealing contact between the valve disc 400 and the connecting post 502 and the mounting groove 501, improving the sealing and firmness of the valve disc 400 installation.

[0049] The threaded structure 503 at the end of the connecting column 502 engages with the clamping nut 600, allowing adjustment of the clamping force on the valve disc 400 via the thread. This ensures that the valve disc 400 fits tightly against each sealing surface while adapting to sealing requirements under different working conditions, preventing sealing failure caused by overpressure or underpressure, and improving the adaptability of the sealing system.

[0050] A positioning flange 405 is formed at one end of the valve disc 400. The outer diameter of the positioning flange 405 matches the mounting groove 501. A third sealing surface 404 is formed on the surface of the positioning flange 405. A conical protrusion 406 is formed on the positioning flange 405. A second sealing surface 403 is formed on the outer surface of the conical protrusion 406. A raised sealing portion 407 is formed at the end of the conical protrusion 406 away from the positioning flange 405. A first sealing surface 402 is formed on the outer surface of the sealing portion 407.

[0051] The three-stage sealing surface design (first sealing surface 402, second sealing surface 403, and third sealing surface 404) of the positioning flange 405, tapered protrusion 406, and sealing part 407 forms a three-dimensional sealing structure, which expands the contact area between the valve disc 400 and the inner wall of the through hole 102, solves the problem of uneven sealing and general sealing effect caused by traditional contact, and improves the sealing performance and isolation reliability of the gate valve through uniformly distributed sealing contact.

[0052] The inclined contact surface 103 at the end of the through hole 102 forms a large-area surface contact with the second sealing surface 403 of the valve disc 400, which increases the effective sealing area and reduces the risk of media penetration. At the same time, the angle matching reduces frictional loss during opening and closing and extends the service life of the sealing surface.

[0053] The sealing protrusion 504 is arranged around the edge of the sealing cover 500 and extends towards the surface of the stop structure. The mounting groove 501 is provided on the sealing cover 500. The valve disc 400 is matched and installed with the mounting groove 501 through the positioning flange 405. The height of the sealing protrusion 504 is greater than the height of the positioning flange 405, so that the end of the sealing protrusion 504 is matched and inserted into the sealing groove 104.

[0054] The annular sealing protrusion 504 on the edge of the sealing cover 500 is inserted and matched with the sealing groove 104 on the surface of the stop structure to form an annular sealing barrier, which enhances the sealing stability between the sealing cover 500 and the stop structure and prevents fluid from leaking from the sealing cover 500 through the valve disc 400. At the same time, the height design of the sealing protrusion 504 ensures a tight fit with the sealing groove 104, improving the overall sealing durability and reliability.

[0055] The inner wall of the through hole 102 and the mating surface 103 are trapezoidal in cross-section with the upper surface of the stop structure. The trapezoidal cross-section of the inner wall of the through hole 102 and the mating surface 103 with the upper surface of the stop structure forms a complementary sealing surface with the conical protrusion 406 of the valve disc 400, thereby forming a trapezoidal seal, enhancing the sealing performance of the sealing contact, and improving the sealing effect.

[0056] The cut-off structure includes a lower water-blocking part 105, an upper water-blocking part 106, and a cut-off part 107. The lower water-blocking part 105 protrudes towards the valve stem 300 and is formed on the bottom wall of the flow channel 101. The upper water-blocking part 106 protrudes towards the bottom wall of the flow channel 101. The cut-off part 107 is connected between the lower water-blocking part 105 and the upper water-blocking part 106, and the cut-off part 107 is horizontally arranged.

[0057] The segmented structure of the lower water-blocking part 105, the upper water-blocking part 106, and the horizontal stop part 107 enhances the structural strength and stability of the stop valve. The horizontal stop part 107 provides a uniform sealing reference surface, which effectively matches the valve disc's more than 400 sealing surfaces, improving sealing reliability and stop-blocking effect, and solving the sealing failure problem caused by traditional single-point sealing.

[0058] The specific operating principle of this utility model is as follows:

[0059] The sealing cap 500 is paired with the connecting end 302 of the valve stem 300. The valve disc 400 is paired with the connecting post 502 through the connecting hole 401. A clamping washer 700 is inserted through the connecting post 502. The clamping nut 600 is threadedly connected to the threaded structure 503. The clamping nut 600 can lock the valve disc through the clamping washer 700. The threaded part 301 of the valve stem 300 is threadedly connected to the threaded hole 201 of the valve cover 200. The valve cover 200 is threadedly connected to the valve body 100. The connecting end 302 of the valve stem 300 drives the sealing cap 500, clamping nut 600, clamping washer 700 and valve disc 400 to pass through the inside of the flow channel 101. The exposed end of the valve stem 300 is connected to the handwheel 800. The rotation of the handwheel 800 can drive the valve stem 300 to lift and lower, controlling the opening and closing of the shut-off valve.

[0060] When the valve stem 300 moves the sealing cover 500 closer to the through hole 102 on the stop portion 107, a triple seal is achieved through the tight fit between the first sealing surface 402 on the valve disc 400 and the inner wall of the through hole 102, the surface contact between the second sealing surface 403 and the mating surface 103, and the fit between the third sealing surface 404 and the upper surface of the stop structure. This achieves multi-directional contact of the sealing surfaces, reduces single-point wear, increases the effective sealing area, and reduces the risk of media penetration. Furthermore, the sealing groove 104 on the upper surface of the stop portion 107 and the sealing protrusion 504 on the edge of the sealing cover 500 form an insertion fit, creating a second sealing barrier at the connection between the valve cover 200 and the stop structure. This further reduces media leakage from the gaps in the sealing contact surfaces, significantly improving the sealing reliability and durability of the stop isolation. This solves the problem of poor sealing effect of the traditional simple inverted conical valve disc 400 sealing surface, and improves high sealing performance.

[0061] When the valve disc needs to be replaced due to wear of the sealing surface caused by long-term opening and closing, the valve stem 300 connecting end 302 is connected to the sealing cover 500 by a clamping connection. The connecting column 502 passes through the valve disc 400 connecting hole 401, the pressure washer 700, and the pressure nut 600 to form a threaded locking connection, forming a detachable structure. This ensures a stable connection between the valve disc 400 and the valve stem 300, and also allows for quick separation of the valve disc 400 by removing the pressure nut 600. After the valve cover 200 is disassembled from the valve body 100 by threading, and the valve stem 300 is disassembled from the valve cover 200, the pressure nut 600 is loosened to tighten the valve disc, realizing convenient disassembly and replacement of the valve disc 400, thereby enhancing the performance.

[0062] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the present utility model without departing from the scope of the present utility model shall fall within the scope of the present utility model.

Claims

1. A high-sealing internal thread stop valve, comprising a valve body and a valve cover, wherein the valve body has an internal flow channel communicating with the outside, and inlet and outlet ports communicating with the flow channel are provided on both sides of the valve body; a stop structure is formed inside the flow channel, and a through hole for connecting the inlet and outlet ports is provided on the stop structure; characterized in that: The valve cover is detachably connected to a valve disc for sealing the through hole and isolating the flow channel via a valve stem. The valve cover has a threaded hole coaxial with the through hole. The valve stem connects to the threaded hole via a threaded portion, allowing the valve stem to drive the valve disc to move up and down relative to the through hole. A connecting end is located at the end of the valve stem near the flow channel, and a sealing cap is held in place at the connecting end. The sealing cap has an internal mounting groove, and a connecting post is formed in the center of the mounting groove. The outer surface of the connecting post has a threaded structure. A mating pass-through feature is located in the center of the valve disc. The connecting post has a connecting hole, and the outer surface of the valve disc has a first sealing surface for tightly fitting with the inner wall of the through hole. The end of the through hole near the valve disc has an inclined fitting surface. The outer surface of the valve disc has a second sealing surface that is in close contact with the fitting surface, and the valve disc has a third sealing surface that is in close contact with the surface of the stop structure. The surface of the stop structure has a sealing groove, and the edge of the sealing cover has a sealing protrusion that is inserted and fitted into the sealing groove. The end of the connecting post away from the mounting groove is connected to a clamping nut for clamping the valve disc through a threaded structure.

2. The high-sealing internal thread stop valve according to claim 1, characterized in that: The outer side of the connecting end is provided with a snap-fit ​​groove, and the surface of the sealing cover is provided with a mating protrusion. The mating protrusion is provided with a mating hole for insertion and assembly with the connecting end, and the end of the mating protrusion near the connecting end is bent to snap-fit ​​with the snap-fit ​​groove.

3. The high-sealing internal thread stop valve according to claim 1, characterized in that: Both ends of the valve body are provided with threaded mounting holes for connecting with pipelines, and the valve cover is provided with mounting nuts. The end of the valve stem passes through the mounting nuts and is connected to a handwheel.

4. The high-sealing internal thread stop valve according to claim 1, characterized in that: A clamping washer is provided between the clamping nut and the valve disc. The clamping washer has a sleeve hole for the connecting column to pass through. The outer diameter of both the clamping nut and the clamping washer is smaller than the inner diameter of the through hole.

5. The high-sealing internal thread stop valve according to claim 1, characterized in that: One end of the valve disc is formed with a positioning flange, the outer diameter of the positioning flange is matched with the mounting groove, a third sealing surface is formed on the surface of the positioning flange, a conical protrusion is formed on the positioning flange, a second sealing surface is formed on the outer surface of the conical protrusion, a raised sealing part is formed at the end of the conical protrusion away from the positioning flange, and a first sealing surface is formed on the outer surface of the sealing part.

6. The high-sealing internal thread stop valve according to claim 5, characterized in that: The sealing protrusion is arranged around the edge of the sealing cover and extends towards the surface of the stop structure. The mounting groove is provided on the sealing cover. The valve disc is installed by matching the mounting groove through the positioning flange. The height of the sealing protrusion is greater than the height of the positioning flange, so that the end of the sealing protrusion is matched and inserted into the sealing groove.

7. A high-sealing internal thread stop valve according to any one of claims 1-6, characterized in that: The inner wall and the mating surface of the through hole are trapezoidal in shape with the cross-section of the upper surface of the stop structure.

8. The high-sealing internal thread stop valve according to claim 7, characterized in that: The stop structure includes a lower water-blocking part, an upper water-blocking part, and a stop part. The lower water-blocking part protrudes towards the valve stem and is formed on the bottom wall of the flow channel. The upper water-blocking part protrudes towards the bottom wall of the flow channel. The stop part connects the lower water-blocking part and the upper water-blocking part and is horizontally positioned.

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