An internally threaded swing check valve

Abstract

The utility model relates to a kind of inner thread swing check valve in check valve field, including valve body, the valve cover being set on valve body and the valve clack being set in valve body, the inside of valve body is formed with the flow channel of through, valve clack is rotatably installed in flow channel by rotating part, the inside of flow channel is connected with valve seat, rotating part includes connecting shaft and swing bar, connecting hole for being used to wear connecting shaft is formed on valve body, swing bar is connected with valve clack by mounting portion at another end, the side surface of valve clack close to valve seat is equipped with sealing groove, sealing boss is formed on valve seat close to valve clack, and the surface of sealing plane is attached with buffer gasket, the inner wall of through-hole is equipped with magnetic attraction part, the inside of sealing groove is provided with magnetic attraction block, the utility model can apply damping to the opening and closing of valve clack by damping gasket, when valve clack rotates and is close to valve seat, the magnetic attraction auxiliary sealing of magnetic attraction block and magnetic attraction part is passed through, further improve the sealing property of valve clack and valve seat, guarantee the stability and reliability of sealing.

Description

Technical Field

[0001] This utility model relates to the field of check valves, specifically to an internally threaded swing check valve. Background Technology

[0002] Valves are control components in fluid transport systems, possessing functions such as shut-off, regulation, flow guidance, backflow prevention, pressure stabilization, diversion, and overflow / pressure relief. Internal threaded swing check valves, as a type of fluid control device, have wide applications, including but not limited to industrial pipeline systems in petroleum, chemical, power, water treatment, and urban pipe networks. They achieve forward flow and reverse shut-off of the medium through the opening / closing of the valve disc around its rotating axis, serving as crucial protective components to ensure the safe operation of pipeline systems and prevent backflow that could damage equipment.

[0003] As a subtype of swing check valve, the internally threaded swing check valve uses an internally threaded connection for quick assembly with pipelines, featuring a compact structure and convenient installation. Its typical structure includes: a valve body with an internally threaded interface, a valve disc hinged to the valve body via a rotating shaft, an annular valve seat located within the valve body's flow channel, and a limiting structure to restrict the valve disc's opening angle. The valve disc opens around the rotating shaft under forward medium pressure and closes under reverse medium pressure through its own weight or spring force, achieving a sealing fit with the valve seat.

[0004] However, existing internal thread swing check valves still have certain technical defects in practical applications: First, during the closing process, the valve disc rapidly impacts the valve seat sealing surface due to inertia, generating high-frequency impact noise and causing valve body vibration. This not only affects the operational stability of the equipment, but also poses safety hazards such as loosening of the connecting threads and seal failure due to long-term vibration. Second, the addition of a rotating shaft damper to alleviate the impact problem often results in poor sealing performance. The damping structure's control over the valve disc closing speed can easily lead to contact misalignment between the valve disc and the valve seat, causing localized stress concentration or insufficient contact on the sealing surface, thus affecting sealing stability and reliability. Therefore, there is an urgent need for an internal thread swing check valve that can reduce noise and achieve high sealing performance. Utility Model Content

[0005] The purpose of this utility model is to solve the above-mentioned defects and provide an internal thread swing check valve to solve the technical problem of how to reduce noise when the valve disc is closed and ensure the sealing stability and reliability of the valve disc closure in the background art.

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

[0007] A threaded swing check valve includes a valve body, a valve cover mounted on the valve body, and a valve disc mounted inside the valve body. The valve body has an internal flow channel. The valve disc is rotatably mounted within the flow channel via a rotating component, and can control the interruption or opening of the flow channel. A valve seat is connected inside the flow channel, and the valve seat has a through hole communicating with the flow channel. The rotating component includes a connecting shaft and a rocker arm. The valve body has a connecting hole for the connecting shaft to pass through. The flow channel has a mounting groove, with positioning portions at both ends. One end of the rocker arm has a rotating portion, which is paired and passes through the mounting groove. The rotating portion is hinged to the rotating shaft via a rotating hole, allowing the rocker arm to pass through... The rotating part can rotate around the pivot. A damping pad is provided between the side of the rotating part and the positioning part. The other end of the rocker arm is connected to the valve disc through the mounting part. A sealing groove is provided on the side of the valve disc near the valve seat. A sealing plane is provided on the side of the valve seat near the valve disc. A sealing boss that matches the sealing groove is formed on the sealing plane. A buffer pad is attached to the surface of the sealing plane. Multiple circumferentially evenly distributed magnetic parts are provided on the inner wall of the through hole. A magnetic block that matches and magnetically connects with the magnetic part is provided on the inner side of the sealing groove. Damping can be applied to the opening and closing of the valve disc through the damping pad. When the valve disc rotates and approaches the valve seat, the magnetic block and the magnetic part assist in sealing.

[0008] Furthermore, as described above, the valve body has a first connecting end and a second connecting end formed at both ends, and the first connecting end and the second connecting end are provided with a threaded structure inside.

[0009] The internal thread structure of the first and second connecting ends enhances the mechanical connection strength between the valve body and the pipeline. The internal thread connection method enables rapid assembly with the pipeline, featuring a compact structure and convenient installation.

[0010] Furthermore, as described above, one end of the connecting hole communicates with the mounting groove, and the other end of the connecting hole passes through the valve body and communicates with the outside. The side of the valve body is provided with a sealing bolt that is sealed to the connecting hole.

[0011] The connection hole is connected to the outside and sealed with sealing bolts to form a sealing barrier, ensuring the overall sealing performance and operational stability of the valve body.

[0012] Furthermore, as described above, multiple damping pads are provided, such that the multiple damping pads are symmetrically arranged on both sides of the rotating part.

[0013] Multiple damping pads are symmetrically distributed on both sides of the rotating part. By balancing the damping torque, the valve disc rotation trajectory is balanced, eliminating the valve disc offset tendency caused by uneven resistance on one side. This ensures that the sealing surface and valve seat are precisely aligned when the valve disc is closed, avoiding local stress concentration. At the same time, the damping provided by the damping pads can slow down the valve disc closing speed, transforming inertial impact into gradual contact, significantly reducing impact noise and vibration amplitude.

[0014] Furthermore, as described above, the flow channel is provided with a connecting part for mating and installing valve seats. The valve seats are mated and installed on the connecting part, and the through hole of the valve seat communicates with the flow channel. The sealing boss is provided as an annular protrusion on the sealing plane, and the outer side of the sealing boss is formed with an inclined sealing slope. The interior of the sealing groove is provided with a connecting slope that contacts the sealing slope.

[0015] A dedicated connection part is set in the flow channel to accurately position the valve seat, and the through hole connects with the flow channel to ensure the efficiency of medium flow. The inclined connection surface of the annular sealing boss and the sealing groove forms a double inclined sealing structure. By increasing the effective sealing area, the contact pressure is dispersed. With the guiding effect of the conical sealing boss, the valve disc gradually fits along the inclined surface during the closing process, reducing sudden contact impact. At the same time, the inclined sealing surface can compensate for machining errors, ensure uniform contact of the sealing surface around the entire circumference, and improve sealing reliability.

[0016] Furthermore, as described above, the sealing boss is tapered.

[0017] The tapered boss design utilizes geometric guiding characteristics to guide the sealing surface to automatically align in the initial stage of valve disc closure, avoiding localized contact of the sealing surface caused by angular deviation; it enhances the fit of the sealing surface and improves sealing stability.

[0018] Furthermore, as described above, a raised positioning seat is provided in the sealing groove, and a positioning groove for pairing magnetic parts is provided on the positioning seat. The magnetic blocks are paired and installed in the positioning groove, so that the magnetic parts can pass through the positioning groove and magnetically connect with the magnetic blocks.

[0019] The magnetic pairing design of the positioning seat and positioning groove provides auxiliary guiding force when the valve disc approaches the valve seat through the precise magnetic connection between the magnetic part and the magnetic block, ensuring that the valve disc and the valve seat sealing surface are accurately aligned and eliminating insufficient contact caused by rotational deviation. The magnetic auxiliary force provides closing force at the end of the closing process, slowing down the impact speed and reducing impact noise. At the same time, the magnetic part and magnetic block further enhance the sealing surface contact pressure of the valve disc and the valve seat, ensuring the sealing effect. Thus, when the valve disc applies damping to reduce the closing impact, it can further assist the valve disc and the valve seat in closing and sealing.

[0020] Furthermore, as described above, a mounting post is formed on the side of the valve disc, and a mounting hole for the mounting post is provided on the mounting part, so that the valve disc passes through the mounting post and is locked in the mounting hole by a nut.

[0021] The valve disc side mounting post and the nut locking structure of the mounting part form a rigid connection node, which enhances the mechanical connection strength between the valve disc and the rocker arm, reduces the loosening of the connection caused by media impact or vibration, and ensures the rotational stability of the valve disc.

[0022] Furthermore, as described above, the valve disc has a plurality of honeycomb-shaped holes inside.

[0023] The honeycomb-shaped perforation design inside the valve disc reduces the closing inertial force by reducing the valve disc's mass, thereby reducing the speed and force of the valve disc impacting the valve seat and reducing impact noise and vibration from a dynamic perspective. The honeycomb structure also enhances the valve disc's impact resistance, improves the valve disc's structural durability under high-frequency vibration conditions, and ensures long-term sealing reliability.

[0024] The beneficial effects of this utility model are as follows: The damping pads generate damping force during the valve disc's rotation and closure, effectively reducing the impact speed of the valve disc on the valve seat seal due to inertia or during closure, thus reducing high-frequency impact noise and valve body vibration amplitude, and improving equipment operational stability. The mating and fitting of the sealing boss and sealing groove on the sealing plane, along with the buffer pad attached to the sealing plane surface, form a sealing guarantee. The embedding of the sealing boss into the sealing groove enhances the sealing surface fit. Simultaneously, the buffer pad absorbs residual impact energy from the valve disc and compensates for the sealing surface, ensuring full contact of the sealing surface in the closed state, improving sealing reliability. Furthermore, the magnetic attraction parts evenly distributed circumferentially on the inner wall of the through hole and the magnetic attraction blocks on the inner side of the sealing groove generate guiding force when the valve disc approaches the valve seat, ensuring precise and controllable valve disc rotation trajectory. This avoids the valve disc and valve seat contact offset problem caused by traditional damping structures, further ensuring full contact between the valve disc and valve seat sealing surfaces, guaranteeing sealing stability and reliability. Attached Figure Description

[0025] Figure 1 This is a perspective view of this embodiment;

[0026] Figure 2 This is a cross-sectional view of this embodiment;

[0027] Figure 3 This is a schematic diagram of the internal structure of this embodiment;

[0028] Figure 4 This is a magnified view of a portion of A in Figure 3;

[0029] Figure 5 This is a schematic diagram of the first direction structure of the valve disc and valve seat in this embodiment;

[0030] Figure 6 This is a schematic diagram of the second-direction structure of the valve disc and valve seat in this embodiment;

[0031] Figure 7 This is a cross-sectional view of the valve disc and valve seat in a sealed state in this embodiment.

[0032] The reference numerals in the figure are as follows:

[0033] 10-Valve body, 11-Flow channel, 12-First connection end, 13-Second connection end, 14-Threaded structure, 15-Mounting groove, 16-Positioning part;

[0034] 20-Valve cover;

[0035] 30-Valve disc, 31-Sealing groove, 32-Connecting bevel, 33-Positioning seat, 34-Positioning groove, 35-Mounting post, 36-Honeycomb hole;

[0036] 40-Valve seat, 41-Through hole, 42-Sealing plane, 43-Sealing boss, 44-Magnetic suction part, 45-Sealing bevel;

[0037] 50 - Connecting shaft;

[0038] 60-Swing arm, 61-Rotating part, 62-Rotating hole, 63-Mounting part, 64-Mounting hole;

[0039] 70 - Damping pad; 80 - Buffer pad; 90 - Magnetic block; 100 - Nut. Detailed Implementation

[0040] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0041] 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.

[0042] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "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.

[0043] In this embodiment, refer to Figures 1-7The present invention relates to an internally threaded swing check valve, comprising a valve body 10, a valve cover 20 disposed on the valve body 10, and a valve disc 30 disposed within the valve body 10. The valve body 10 has an internally formed flow channel 11. The valve disc 30 is rotatably mounted within the flow channel 11 via a rotating component, and can control the interruption or opening of the flow channel 11. A valve seat 40 is connected internally to the flow channel 11, and the valve seat 40 has a through hole 41 communicating with the flow channel 11. The rotating component includes a connecting shaft 50 and a rocker arm 60. The valve body 10 has a connecting hole for the connecting shaft 50 to pass through. The flow channel 11 has an internally formed mounting groove 15, with positioning portions 16 formed at both ends. One end of the rocker arm 60 has a rotating portion 61, which is paired and passes through the mounting groove 15, and is hinged to the rotating shaft via a rotating hole 62. The rocker arm 60 can rotate around the pivot through the rotating hole 62. A damping pad 70 is provided between the side of the rotating part 61 and the positioning part 16. The other end of the rocker arm 60 is connected to the valve disc 30 through the mounting part 63. A sealing groove 31 is provided on the side of the valve disc 30 near the valve seat 40. A sealing plane 42 is provided on the side of the valve seat 40 near the valve disc 30. A sealing boss 43 matching the sealing groove 31 is formed on the sealing plane 42. A buffer pad 80 is attached to the surface of the sealing plane 42. Four magnetic suction parts 44 are provided on the inner wall of the through hole 41. A magnetic suction block 90 matching and magnetically connected to the magnetic part is provided on the inner side of the sealing groove 31. The damping pad 70 can apply damping to the opening and closing of the valve disc 30. When the valve disc 30 rotates and approaches the valve seat 40, the magnetic suction block 90 and the magnetic suction part 44 assist in sealing.

[0044] The valve body 10 has a first connecting end 12 and a second connecting end 13 formed at both ends, and the first connecting end 12 and the second connecting end 13 are provided with a threaded structure 14 inside.

[0045] The internal thread structure 14 of the first connecting end 12 and the second connecting end 13 enhances the mechanical connection strength between the valve body 10 and the pipeline. The internal thread connection method enables rapid assembly with the pipeline, which features a compact structure and convenient installation.

[0046] One end of the connecting hole is connected to the mounting groove 15, and the other end of the connecting hole passes through the valve body 10 and is connected to the outside. The side of the valve body 10 is provided with a sealing bolt that is sealed to the connecting hole.

[0047] The connection hole is connected to the outside and sealed with sealing bolts to form a sealing barrier, ensuring the overall sealing performance and operational stability of the valve body 10.

[0048] Specifically, the connecting hole extends through the valve body 10, allowing the connecting shaft 50 to pass through the connecting hole, and both ends of the connecting hole are connected to sealing bolts.

[0049] Four damping pads 70 are provided, and the four damping pads 70 are symmetrically arranged on both sides of the rotating part 61.

[0050] Multiple damping pads 70 are symmetrically distributed on both sides of the rotating part 61. By balancing the damping torque, the rotation trajectory of the valve disc 30 is balanced, eliminating the tendency of the valve disc 30 to deviate caused by uneven resistance on one side. This ensures that the sealing surface of the valve disc 30 is precisely aligned with the valve seat 40 when the valve disc 30 is closed, avoiding local stress concentration. At the same time, the damping provided by the damping pads 70 can slow down the closing speed of the valve disc 30, transforming the inertial impact into a gradual contact, and significantly reducing impact noise and vibration amplitude.

[0051] The flow channel 11 is provided with a connecting part for pairing and installing valve seats 40. The valve seats 40 are paired and installed on the connecting part, and the through hole 41 of the valve seats 40 communicates with the flow channel 11. The sealing boss 43 is provided in annular protrusion on the sealing plane 42. The outer side of the sealing boss 43 is formed with an inclined sealing slope 45. The sealing groove 31 is provided with a connecting slope 32 that contacts the sealing slope 45.

[0052] A dedicated connecting part is set in the flow channel 11 to precisely position the valve seat 40. The through hole 41 is connected to the flow channel 11 to ensure the efficiency of medium flow. The annular sealing boss 43 and the inclined connecting slope 32 of the sealing groove 31 form a double inclined sealing structure. By increasing the effective sealing area, the contact pressure is dispersed. With the guiding effect of the conical sealing boss 43, the valve disc 30 gradually fits along the slope during the closing process, reducing sudden contact impact. At the same time, the inclined sealing slope 45 can compensate for machining errors, ensure uniform contact of the sealing surface around the entire circumference, and improve sealing reliability.

[0053] The sealing boss 43 is tapered. The tapered boss design utilizes geometric guiding characteristics to guide the sealing surface to automatically align in the initial stage of valve disc 30 closure, avoiding local contact of the sealing surface caused by angular deviation; it enhances the sealing surface fit and improves sealing stability.

[0054] The sealing groove 31 is provided with a raised positioning seat 33. The positioning seat 33 is provided with a positioning groove 34 for matching the magnetic suction part 44. The magnetic suction block 90 is matched and installed in the positioning groove 34, so that the magnetic suction part 44 can pass through the positioning groove 34 and magnetically connect with the magnetic suction block 90.

[0055] The magnetic pairing design of the positioning seat 33 and the positioning groove 34, through the precise magnetic connection between the magnetic part 44 and the magnetic block 90, provides auxiliary guiding force when the valve disc 30 approaches the valve seat 40, ensuring that the sealing surfaces of the valve disc 30 and the valve seat 40 are precisely aligned, eliminating insufficient contact caused by rotational deviation; the magnetic auxiliary force provides closing force at the end of the closing process, slowing down the impact speed and reducing impact noise. At the same time, the magnetic part 44 and the magnetic block 90 further enhance the sealing surface contact pressure of the valve disc 30 and the valve seat 40, ensuring the sealing effect. Thus, when the valve disc 30 applies damping to reduce the closing impact, it can further assist the closing and sealing of the valve disc 30 and the valve seat 40.

[0056] The magnetic block 90 can be installed in the positioning groove 34 by means of adhesive or screws, and the magnetic block 90 and the positioning groove 34 of the valve disc 30 can be fixed in a relatively fixed manner.

[0057] Understandably, in order to ensure a tight seal between the valve disc 30 and the valve seat 40, the width of the positioning groove 34 is greater than the width of the magnetic suction part 44, so as to ensure the fit between the valve disc 30 and the valve seat 40.

[0058] The valve disc 30 has a mounting post 35 on its side. The mounting part 63 has a mounting hole 64 for the mounting post 35 to pass through, so that the valve disc 30 passes through the mounting post 35 into the mounting hole 64 and is locked by the nut 100.

[0059] The valve disc 30 is locked to the mounting post 35 on the side and the nut 100 of the mounting part 63 to form a rigid connection node, which enhances the mechanical connection strength between the valve disc 30 and the rocker arm 60, reduces the loosening of the connection caused by media impact or vibration, and ensures the rotational stability of the valve disc 30.

[0060] The valve disc 30 has several honeycomb-shaped holes 36 inside.

[0061] The honeycomb-shaped hole design inside the valve disc 30 reduces the closing inertial force by reducing the mass of the valve disc 30, thereby reducing the speed and force of the valve disc 30 hitting the valve seat 40 and reducing impact noise and vibration from a dynamic perspective. The honeycomb structure also enhances the impact resistance of the valve disc 30, improves the structural durability of the valve disc 30 under high-frequency vibration conditions, and ensures long-term sealing reliability.

[0062] The damping pad 70 generates damping force during the rotation and closing of the valve disc 30, effectively reducing the impact speed of the valve disc 30 on the valve seat 40 seal due to inertia or during closure, thus reducing high-frequency impact noise and valve body 10 vibration amplitude, and improving equipment operational stability. The mating and fitting of the sealing boss 43 and the sealing groove 31 on the sealing plane 42, together with the buffer pad 80 attached to the surface of the sealing plane 42, form a sealing guarantee. The sealing boss 43 embedded in the sealing groove 31 enhances the sealing surface fit, while the buffer pad 80 absorbs... The residual impact energy of the valve disc 30 is compensated for on the sealing surface, ensuring full contact between the sealing surfaces in the closed state and improving sealing reliability. The magnetic attraction parts 44, which are evenly distributed circumferentially on the inner wall of the through hole 41, are magnetically paired with the magnetic attraction blocks 90 on the inner side of the sealing groove 31. When the valve disc 30 approaches the valve seat 40, a guiding force is generated, ensuring that the rotation trajectory of the valve disc 30 is precise and controllable. This avoids the contact offset problem between the valve disc 30 and the valve seat 40 caused by traditional damping structures, and further ensures full contact between the sealing surfaces of the valve disc 30 and the valve seat 40, guaranteeing the stability and reliability of the seal.

[0063] The magnetic attraction of the magnetic attraction part 44 and the magnetic attraction block 90 provides auxiliary sealing force at the end of the valve disc 30 closure. The magnetic attraction ensures the final sealing contact pressure. The two work together to achieve a "soft landing" closure process, which eliminates impact noise and ensures uniform force on the sealing surface, thus solving the technical contradiction of "noise reduction" and "sealing" that are difficult to balance in traditional technology.

[0064] The specific operating principle in this embodiment is as follows:

[0065] The valve disc 30 is fitted and paired with the mounting hole 64 on the rocker arm 60 via the mounting post 35, and connected to the mounting post 35 via the nut 100, thus locking the valve disc 30 and the rocker arm 60 together. Magnetic blocks 90 are evenly distributed and fixedly connected to the positioning groove 34 of the valve disc 30, allowing the rotating part 61 of the rocker arm 60 to be fitted into the mounting groove 15. Damping pads 70 are provided on both sides of the rotating part 61. A connecting shaft 50 is connected by passing through the connecting hole, the damping pads 70, and the rotating hole 62 in sequence. The rocker arm 60 can rotate around the connecting shaft 50, thereby moving the valve disc 30 relative to the valve seat 40, closer to or further away. The damping pads 70 generate damping force during the rotation and closing of the valve disc 30, effectively reducing the impact speed of the valve disc 30 on the valve seat 40 seal due to inertia or during closing, reducing high-frequency impact noise and the vibration amplitude of the valve body 10, and improving the operational stability of the equipment.

[0066] The valve seat 40 is installed in the connecting part. The sealing boss 43 set on the sealing plane 42 and the sealing groove 31 are matched and fitted together. With the buffer gasket 80 attached to the surface of the sealing plane 42, a sealing guarantee is formed. The sealing boss 43 is embedded in the sealing groove 31 to enhance the sealing surface fit. When the valve disc 30 is closed by matching the sealing boss with the sealing groove 31, the buffer gasket 80 absorbs the residual impact energy of the valve disc 30 and compensates the sealing surface, ensuring that the sealing surface is in full contact when closed, improving the sealing reliability. In addition, the magnetic attraction part 44 evenly distributed on the inner wall of the through hole 41 is magnetically matched with the magnetic attraction block 90 on the inner side of the sealing groove 31. When the valve disc 30 approaches the valve seat 40, a guiding force is generated to ensure that the rotation trajectory of the valve disc 30 is precise and controllable. This avoids the contact offset problem between the valve disc 30 and the valve seat 40 caused by the traditional damping structure, and further ensures that the sealing surface of the valve disc 30 and the valve seat 40 are in full contact, ensuring the stability and reliability of the seal.

[0067] 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 threaded swing check valve, comprising a valve body, a valve cover disposed on the valve body, and a valve disc disposed within the valve body, wherein a flow channel is formed inside the valve body, and the valve disc is rotatably mounted within the flow channel via a rotating component, and can control the interruption or opening of the flow channel, characterized in that: A valve seat is internally connected to the flow channel. The valve seat has a through hole communicating with the flow channel. The rotating component includes a connecting shaft and a rocker arm. A connecting hole for the connecting shaft is formed on the valve body. An installation groove is provided inside the flow channel, with positioning parts at both ends. A rotating part is formed at one end of the rocker arm. The rotating parts are paired and inserted into the installation groove, and are hinged to the rotating shaft through a rotating hole, allowing the rocker arm to rotate around the rotating shaft. A damping pad is provided between the side of the rotating part and the positioning part. The other end of the rocker arm is connected to the connecting shaft through a connecting hole. The assembly is connected to the valve disc. The valve disc has a sealing groove on the side near the valve seat, and the valve seat has a sealing plane on the side near the valve disc. A sealing boss that matches the sealing groove is formed on the sealing plane, and a buffer gasket is attached to the surface of the sealing plane. The inner wall of the through hole has multiple circumferentially evenly distributed magnetic parts. The inner side of the sealing groove has a magnetic block that matches and magnetically connects with the magnetic parts. Damping gaskets can be applied to the opening and closing of the valve disc, so that when the valve disc rotates and approaches the valve seat, the magnetic attraction between the magnetic block and the magnetic parts assists in sealing.

2. The internal thread swing check valve according to claim 1, characterized in that: The valve body has a first connecting end and a second connecting end at its two ends, and the first connecting end and the second connecting end are provided with a threaded structure inside.

3. The internal thread swing check valve according to claim 1, characterized in that: One end of the connecting hole is connected to the mounting groove, and the other end of the connecting hole passes through the valve body and is connected to the outside. The side of the valve body is provided with a sealing bolt that is sealed to the connecting hole.

4. The internal thread swing check valve according to claim 3, characterized in that: Multiple damping pads are provided, and the multiple damping pads are symmetrically arranged on both sides of the rotating part.

5. The internal thread swing check valve according to claim 1, characterized in that: The flow channel is provided with a connecting part for matching and installing valve seats. The valve seats are matched and installed on the connecting part, and the through hole of the valve seat communicates with the flow channel. The sealing boss is provided as an annular protrusion on the sealing plane. The outer side of the sealing boss forms an inclined sealing slope. The interior of the sealing groove is provided with a connecting slope that contacts the sealing slope.

6. The internal thread swing check valve according to claim 5, characterized in that: The sealing boss is tapered.

7. The internal thread swing check valve according to claim 5, characterized in that: The sealing groove is provided with a raised positioning seat, and the positioning seat is provided with a positioning groove for matching magnetic parts. The magnetic blocks are matched and installed in the positioning groove, so that the magnetic parts can pass through the positioning groove and magnetically connect with the magnetic blocks.

8. A threaded swing check valve according to any one of claims 1-7, characterized in that: The valve disc has a mounting post on its side, and the mounting part has a mounting hole for the mounting post to pass through, so that the valve disc passes through the mounting post and is locked in the mounting hole by a nut.

9. A threaded swing check valve according to any one of claims 1-7, characterized in that: The valve disc has several honeycomb-shaped holes inside.

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