A flange swing check valve

Abstract

The utility model relates to a flange swing type check valve in the field of check valve, including valve body, valve cover and valve clapper, the inside of valve body forms the flow channel of leading through, the both ends of flow channel form the flow inlet and flow outlet respectively, the valve clapper rotatablely installs in the flow channel through the rotator, the inside of flow channel is connected with the valve seat, the end of valve seat is provided with the docking end of ladder type, the outside of docking end is sleeved with sealing element, the surface of valve clapper is provided with the connecting end of buckling and pairing with docking end, the inside of connecting end forms the recess, the bottom wall of recess is provided with first magnetic attraction structure, the inner wall of through -hole is connected with the second magnetic attraction structure of magnetic attraction position limiting with magnetic attraction structure, the utility model discloses further enhance the sealing property that valve clapper and valve seat form sealing pair through the joint action of buckling and pairing structure cooperation magnetic attraction position limiting of docking end and connecting end, ensure the stability and reliability of sealing, reduce the medium leakage risk of the sealing failure, guarantee system high -efficient stable operation.

Description

Technical Field

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

[0002] Valves are control components in fluid transport systems, with functions such as shut-off, regulation, flow diversion, backflow prevention, pressure stabilization, flow splitting, or overflow pressure relief. Flanged swing check valves, as a type of fluid control device, have a wide range of applications, including but not limited to industrial pipeline systems in petroleum, chemical, power, water treatment, and urban pipe networks. They are primarily used to prevent equipment damage, system malfunctions, or safety accidents caused by backflow of the medium.

[0003] Traditional flanged swing check valves typically consist of a valve body, valve disc, pivot, valve seat, and flange connection assembly. The valve body connects to the piping system at both ends via flanges, forming a media flow channel internally. The valve disc is hinged to the valve body via the pivot and can rotate around its axis to open and close. The valve seat is located within the valve body's flow channel, forming a sealing pair with the valve disc's sealing surface. When the media flows forward, the valve disc is pushed open by the media pressure, allowing the media to pass through. When the media stops flowing or shows a backflow tendency, the valve disc quickly returns to its seat under its own weight, spring force, or reverse media pressure, forming a tight seal with the valve seat and blocking the backflow path of the media.

[0004] However, existing flanged swing check valves still have certain shortcomings in sealing performance. Specifically, under low-pressure or low-differential-pressure conditions, the medium pressure may be insufficient to overcome the weight of the valve disc, frictional resistance, and residual medium inertia, causing the valve disc to fail to fully conform to the valve seat, thus creating a risk of incomplete sealing. Secondly, existing sealing structures are relatively simple, with traditional designs often employing metal-to-metal hard seals. Under prolonged scouring by the medium, the sealing surface is easily worn, affecting the sealing pair formed between the valve disc and valve seat, shortening the valve's service life, and potentially leading to medium leakage, reduced system efficiency, or even safety accidents due to seal failure. Therefore, there is an urgent need for a flanged swing check valve with high sealing performance and reliable sealing. Utility Model Content

[0005] The purpose of this utility model is to solve the above-mentioned defects and provide a flange swing check valve to solve the technical problem in the background art of how to improve the sealing performance between the valve disc and the valve seat of the flange swing check valve to ensure its reliability and service life.

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

[0007] A flanged swing check valve includes a valve body, a valve cover mounted on the valve body, and a valve disc mounted within the valve body. The valve body has an internal flow channel with an inlet and an outlet at each end. The valve disc is rotatably mounted within the flow channel via a rotating component. A valve seat is connected to the inside of the flow channel and mounted within the flow channel near the inlet via a connecting component. The valve seat has a through hole communicating with the flow channel. The end of the valve seat has a stepped mating end extending towards the valve disc. A sealing element is fitted on the outer side. The valve disc can be adjusted relative to the valve seat by a rotating element. The surface of the valve disc has a connecting end that engages with the mating end. A groove is formed inside the connecting end. A first magnetic attraction structure is provided on the bottom wall of the groove. A second magnetic attraction structure is connected to the inner wall of the through hole and magnetically limits the magnetic attraction structure. This allows the valve disc to form a sealing pair by mating with the mating end and cover the through hole. The rotation of the rotating element allows the valve disc to control the opening and closing of the through hole, thus isolating the inlet and outlet.

[0008] Furthermore, as described above, the valve body has an internal fitting portion for mating and installing a valve seat. The valve seat is mated and inserted into the fitting portion. The mating end includes a mating portion, a first sealing protrusion, and a second sealing protrusion. The cross-sections of the mating portion, the first sealing protrusion, and the second sealing protrusion are arranged in a stepped manner. The first sealing protrusion and the second sealing protrusion have a first sealing groove and a second sealing groove for mating, holding, and installing a sealing element.

[0009] The design employs a stepped distribution of the mating section and first / second sealing protrusions, combined with the mating and interlocking installation of the first / second sealing grooves, forming a multi-level sealing barrier. When the medium pressure is insufficient, the first sealing protrusion and the first sealing ring make initial contact to form a primary seal, while the second sealing protrusion and the second sealing ring provide secondary sealing compensation. This effectively solves the defect of easy leakage from a single sealing surface under low pressure differential. At the same time, the double sealing groove structure can disperse the scouring force of the medium and delay the wear of the seals.

[0010] Furthermore, as described above, the sealing element includes a first sealing ring and a second sealing ring, which are paired and sleeved on the mating end, and are respectively paired and engaged with the first sealing groove and the second sealing groove.

[0011] A pairing structure is adopted, in which the first and second sealing rings are respectively held in the first and second sealing grooves, forming a double sealing defense. The double sealing rings compensate for the sealing gap through elastic deformation when the medium pressure fluctuates, improving sealing reliability under low-pressure conditions. At the same time, the double-sealing structure reduces the direct erosion of a single sealing surface by the medium, lowering the wear rate. Combined with the stepped mating ends and connection ends, it enhances the wear resistance of the sealing pair, effectively solving the problems of easy wear and short lifespan of traditional hard seals.

[0012] Meanwhile, the sealing ring is installed on the sealing groove of the valve seat by clamping, so that the corresponding sealing ring can be regularly maintained and replaced according to the working frequency of the check valve, so as to ensure the sealing performance and reliability of the valve disc and the valve seat.

[0013] Furthermore, as described above, the inner wall of the groove is formed with a first retaining portion and a second retaining portion that are respectively paired with the first sealing protrusion and the second sealing protrusion. The first retaining portion and the second retaining portion are respectively provided with a first sealing portion and a second sealing portion that make sealing contact with the first sealing ring and the second sealing ring.

[0014] The inner wall of the groove is provided with a first retaining part and a second retaining part, and matching first and second sealing protrusions at their mating ends. These, in conjunction with the first and second sealing parts and the double sealing rings, achieve precise alignment of the sealing surfaces during valve disc oscillation and closure through the combined effects of physical limiting by the retaining parts and elastic contact of the sealing parts. Simultaneously, the contact surface between the sealing parts and the sealing rings is optimized to reduce the wear rate of the sealing surface, improving the sealing reliability and service life of the sealing pair under frequent opening and closing conditions.

[0015] Further, as described above, the first magnetic attraction structure is composed of a ring magnet, which is installed in pairs on the bottom wall of the groove. The second magnetic attraction structure is composed of multiple magnet blocks, which are installed in a circumferentially spaced array on the inner wall of the through hole. The ends of the magnet blocks near the valve disc form a magnetic attraction part that is magnetically paired with the ring magnet.

[0016] The design of the annular magnet and the circumferential array of magnet blocks on the inner wall of the through hole generates an axial magnetic attraction force when the valve disc closes, assisting the medium pressure in pushing the valve disc tightly against the valve seat. This magnetic attraction structure can provide additional closing force under low-pressure conditions, ensuring full contact between the bottom wall of the groove at the valve disc connection end and the mating end, solving the problem of poor sealing caused by insufficient medium pressure, improving sealing reliability, and extending the service life of the sealing pair.

[0017] Furthermore, the inner wall of the flow channel is formed with raised flow-guiding protrusions, which extend in a streamlined shape from the end of the flow channel near the inlet to the outlet.

[0018] The inner wall of the flow channel features streamlined, extending guide protrusions that optimize the medium flow path and reduce fluid turbulence and pressure loss. This design guides the medium to flow smoothly through the inlet via the streamlined structure, reducing the impact force on the valve disc and minimizing the risk of abnormal valve opening. Simultaneously, the guide protrusions reduce medium retention at the sealing surface, lowering the erosion wear rate and improving the overall sealing performance and service life of the valve.

[0019] Furthermore, as described above, a connecting post is formed on the side of the valve disc, and the rotating component includes a rotating shaft and a hinge rod. The rotating shaft is paired and connected to the valve body, one end of the hinge rod is paired and installed with the rotating shaft through a hinge hole, and the other end of the hinge rod is paired and connected to the connecting post through a connecting hole.

[0020] The hinged connection between the rotating shaft and the hinge rod, and the paired installation of the hinge rod and the valve disc connecting post, ensure that the valve disc can swing flexibly, avoiding poor sealing caused by transmission jamming. At the same time, the transmission structure optimizes the force distribution through the hinge point, reducing the eccentric stress during valve disc swing, lowering the wear rate of transmission components, improving transmission reliability and valve disc positioning accuracy, and enhancing the closing stability of the sealing pair.

[0021] Furthermore, as described above, the valve cover is installed on the valve body by bolts, and a limiting protrusion is formed on the inner side of the valve cover. The end of the limiting protrusion extends toward the valve disc, and a buffer pad is connected to the end of the limiting protrusion.

[0022] The inner side of the valve cover is equipped with a limiting protrusion and a buffer pad. When the valve disc is opened to its maximum position, the buffer pad absorbs the impact energy, reducing the hard collision between the valve disc and the valve cover. At the same time, the limiting protrusion precisely controls the valve disc opening stroke, avoiding abnormal wear of the sealing surface caused by over-opening, thus improving the overall reliability and service life of the valve.

[0023] The beneficial effects of this utility model are as follows: The stepped mating end of the valve seat, through a multi-stage sealing design, forms a composite sealing structure with the outer sleeve sealing element. Under low pressure or slight pressure difference conditions, the dual action of mechanical sealing and elastic sealing ensures tight contact and fit between the valve disc connection end and the mating end, solving the problem of incomplete sealing caused by insufficient pressure in traditional hard seals and improving sealing reliability. At the same time, the first magnetic attraction structure on the bottom wall of the groove and the second magnetic attraction structure on the inner wall of the through hole form a magnetic attraction limit. When the medium pressure is insufficient to drive the valve disc connection end and the valve seat mating end to fit completely, the magnetic attraction force can provide additional closing driving force to ensure tight contact between the valve disc and the valve seat, maintain effective sealing of the sealing pair, and enhance sealing performance. The interlocking and matching structure of the mating end and the connection end, together with the magnetic attraction limit, further enhances the sealing performance of the valve disc and valve seat forming a sealing pair, ensuring the stability and reliability of the seal, reducing the risk of medium leakage due to seal failure, and ensuring efficient and stable operation of the system. Attached Figure Description

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

[0025] Figure 2 This is a schematic diagram of the internal structure of this embodiment;

[0026] Figure 3 for Figure 2 A magnified view of part A in the diagram;

[0027] Figure 4 This is a schematic diagram of the valve seat and valve disc in this embodiment;

[0028] Figure 5 This is a schematic diagram showing the connection between the valve seat and the valve disc in 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-Flow inlet, 103-Flow outlet, 104-Guide protrusion;

[0032] 200-Valve cover, 201-Limit protrusion, 202-Buffer pad;

[0033] 300-Valve disc, 301-Groove, 302-First retaining part, 303-Second retaining part, 304-First sealing part, 305-Second sealing part;

[0034] 400-valve seat, 401-through hole, 402-butt joint, 403-first sealing protrusion, 404-second sealing protrusion, 405-first sealing groove, 406-second sealing groove;

[0035] 500 - First sealing ring; 600 - Second sealing ring; 700 - Ring magnet; 800 - Magnet block; 900 - Rotating shaft; 1000 - Hinge rod. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0037] In this embodiment, refer to Figures 1-6The present invention relates to a flange swing check valve, comprising a valve body 100, a valve cover 200 disposed on the valve body 100, and a valve disc 300 disposed within the valve body 100. The valve body 100 has an internally formed flow channel 101, with an inlet 102 and an outlet 103 formed at both ends of the flow channel 101. The valve disc 300 is rotatably mounted within the flow channel 101 via a rotating component. A valve seat 400 is connected internally to the flow channel 101, and is mounted internally to the flow channel 101 near the inlet 102 via a connecting component. The valve seat 400 has an internally formed through-hole 401 communicating with the flow channel 101, and a stepped mating end is provided at the end of the valve seat 400. The mating end extends towards the valve disc 300, and a sealing element is sleeved on the outer side of the mating end. The valve disc 300 can be swung and adjusted relative to the valve seat 400 by a rotating element. The surface of the valve disc 300 has a connecting end that engages with the mating end. A groove 301 is formed inside the connecting end. A first magnetic attraction structure is provided on the bottom wall of the groove. A second magnetic attraction structure is connected to the inner wall of the through hole 401 and magnetically limits the magnetic attraction structure. This allows the valve disc 300 to form a sealing pair by mating with the mating end and cover the through hole 401. The rotation of the rotating element allows the valve disc 300 to control the opening and closing of the through hole 401, thus isolating the inlet 102 and the outlet 103.

[0038] The valve body 100 has an internal fitting portion for mating and installing the valve seat 400. The valve seat 400 is mated and inserted into the fitting portion. The mating end includes a mating portion 402, a first sealing protrusion 403 and a second sealing protrusion 404. The cross-sections of the mating portion 402, the first sealing protrusion 403 and the second sealing protrusion 404 are arranged in a stepped manner. The first sealing protrusion 403 and the second sealing protrusion 404 have a first sealing groove 405 and a second sealing groove 406 for mating and holding the sealing element.

[0039] The stepped design, consisting of the mating part 402 and the first / second sealing protrusions 404, combined with the mating and snap-fit ​​installation of the first / second sealing grooves 406, forms a multi-level sealing barrier. When the medium pressure is insufficient, the first sealing protrusion 403 and the first sealing ring 500 first contact to form a primary seal, while the second sealing protrusion 404 and the second sealing ring 600 provide secondary sealing compensation. This effectively solves the defect of easy leakage from a single sealing surface under low pressure differential. At the same time, the double sealing groove structure can disperse the scouring force of the medium and delay the wear of the seals.

[0040] The sealing element includes a first sealing ring 500 and a second sealing ring 600. The first sealing ring 500 and the second sealing ring 600 are paired and sleeved on the mating end, and the first sealing ring 500 and the second sealing ring 600 are respectively paired and locked with the first sealing groove 405 and the second sealing groove 406.

[0041] A pairing structure is adopted, in which the first sealing ring 500 and the second sealing ring 600 are respectively engaged in the first sealing groove 405 and the second sealing groove 406, forming a double sealing defense. The double sealing rings compensate for the sealing gap through elastic deformation when the medium pressure fluctuates, improving the sealing reliability under low-pressure conditions. At the same time, the double sealing structure reduces the direct erosion of the single sealing surface by the medium, lowering the wear rate. Combined with the stepped mating end and connecting end pairing, it enhances the wear resistance of the sealing pair, effectively solving the problems of easy wear and short service life of traditional hard seals.

[0042] Meanwhile, the sealing ring is installed on the sealing groove of the valve seat 400 by clamping, so that the corresponding sealing ring can be regularly maintained and replaced according to the working frequency of the check valve, so as to ensure the sealing performance and reliability of the valve disc 300 and the valve seat 400.

[0043] The inner wall of the groove 301 is formed with a first retaining portion 302 and a second retaining portion 303 that are respectively paired with the first sealing protrusion 403 and the second sealing protrusion 404. The first retaining portion 302 and the second retaining portion 303 are respectively provided with a first sealing portion 304 and a second sealing portion 305 that make sealing contact with the first sealing ring 500 and the second sealing ring 600.

[0044] The inner wall of the groove is provided with a first retaining part 302 and a second retaining part 303, which match the first sealing protrusion 403 and the second sealing protrusion 404 at the mating end. These, along with the first sealing part 304 and the second sealing part 305, form a sealing contact with the double sealing rings. Through the combined effect of the physical limiting action of the retaining parts and the elastic contact of the sealing parts, precise alignment of the sealing surfaces is achieved when the valve disc 300 swings and closes. Simultaneously, the contact surface between the sealing parts and the sealing rings is optimized to reduce the wear rate of the sealing surface, thereby improving the sealing reliability and service life of the sealing pair under frequent opening and closing conditions.

[0045] The first magnetic attraction structure is composed of annular magnets 700, which are paired and installed on the bottom wall of the groove 301. The second magnetic attraction structure is composed of multiple magnet blocks 800, which are arranged in a circumferentially spaced array on the inner wall of the through hole 401. The ends of the magnet blocks 800 near the valve disc 300 form magnetic attraction parts that are magnetically paired with the annular magnets 700.

[0046] The design of the annular magnet 700 and the circumferential array of magnet blocks 800 on the inner wall of the through hole 401 generates an axial magnetic attraction force when the valve disc 300 is closed, which assists the medium pressure in pushing the valve disc 300 to adhere tightly to the valve seat 400. This magnetic attraction structure can provide additional closing force under low-pressure conditions, ensuring full contact between the bottom wall of the groove at the connecting end of the valve disc 300 and the mating end, solving the problem of poor sealing caused by insufficient medium pressure, improving sealing reliability, and extending the service life of the sealing pair.

[0047] Specifically, under high-pressure conditions, the combined effect of medium pressure and magnetic attraction ensures a tight seal; under low-pressure conditions, the magnetic attraction compensates for insufficient medium pressure, maintaining effective contact between the sealing surfaces. This ensures a reliable barrier between the inlet 102 and the outlet 103 within the pressure range, preventing medium leakage and improving system operational safety.

[0048] The inner wall of the flow channel 101 is formed with a raised flow guide protrusion 104, which extends in a streamlined shape from one end of the flow channel 101 near the inlet 102 to the outlet 103.

[0049] The inner wall of the flow channel 101 features streamlined, extending guide protrusions 104 to optimize the medium flow path and reduce fluid turbulence and pressure loss. This design guides the medium to flow smoothly through the inlet 102 via the streamlined structure, reducing the impact force on the valve disc 300 and minimizing the risk of abnormal valve opening. Simultaneously, the guide protrusions 104 reduce medium retention at the sealing surface, lowering the erosion wear rate and improving the overall sealing performance and service life of the valve.

[0050] A connecting post is formed on the side of the valve disc 300. The rotating component includes a rotating shaft 900 and a hinge rod 1000. The rotating shaft 900 is paired with the valve body 100. One end of the hinge rod 1000 is paired with the rotating shaft 900 through a hinge hole, and the other end of the hinge rod is paired with the connecting post through a connecting hole.

[0051] The hinged connection between the rotating shaft 900 and the hinge rod 1000, and the mating installation of the hinge rod 1000 and the connecting post of the valve disc 300, ensure that the valve disc 300 can swing flexibly, avoiding poor sealing caused by transmission jamming. Simultaneously, the transmission structure optimizes the force distribution through the hinge point, reducing the eccentric stress during valve disc 300 swing, lowering the wear rate of transmission components, improving transmission reliability and valve disc 300 positioning accuracy, and enhancing the closing stability of the sealing pair. Specifically, when the medium flows forward, the valve disc 300 is pushed open by the medium pressure around the hinge rod 1000, at which time the through hole 401 connects with the flow channel 101, allowing the medium to pass through; when the medium stops flowing or shows a backflow tendency, the valve disc 300 quickly returns to its seat under its own weight, spring force, or reverse medium pressure, forming a seal through the tight fit between the connecting end and the mating end of the valve seat 400, blocking the backflow path of the medium.

[0052] The valve cover 200 is bolted to the valve body 100. A limiting protrusion 201 is formed on the inner side of the valve cover 200. The end of the limiting protrusion 201 extends toward the valve disc 300, and a buffer pad 202 is connected to the end of the limiting protrusion 201.

[0053] The inner side of the valve cover 200 is provided with a limiting protrusion 201 and a buffer pad 202. When the valve disc 300 is opened to its maximum position, the buffer pad 202 absorbs the impact energy, reducing the hard collision between the valve disc 300 and the valve cover 200. At the same time, the limiting protrusion 201 precisely controls the opening stroke of the valve disc 300, avoiding abnormal wear of the sealing surface caused by excessive opening, and improving the overall reliability and service life of the valve.

[0054] The specific operating principle in this embodiment is as follows:

[0055] The valve seat 400 is mated and inserted into the mounting part and fixed by welding. The mating end of the valve seat 400 forms a stepped mating part 402, a first sealing protrusion 403, and a second sealing protrusion 404. The first sealing protrusion 403 and the second sealing protrusion 404 are provided with a first sealing groove 405 and a second sealing groove 406 for mating and holding the sealing elements. The first sealing ring 500 and the second sealing ring 600 are respectively mated and installed on the first sealing groove 405 and the second sealing groove 406. The first holding part 302 and the second holding part 303 in the groove 301 are used to match the first sealing protrusion 403 and the second sealing protrusion 404 at the mating end, and can be respectively connected to the first sealing ring 500 and the second sealing protrusion 604 through the first sealing part 304 and the second sealing part 305. The sealing ring 600 makes sealing contact. Specifically, when the medium stops flowing, the valve disc 300 quickly returns to its seat under its own weight or reverse medium pressure, forming a sealing pair by tightly fitting the connecting end with the mating end of the valve seat 400, blocking the backflow path of the medium. At the same time, when the valve disc 300 swings towards the valve seat 400 around the hinge rod 1000, the first magnetic attraction structure and the second magnetic attraction structure on the inner wall of the through hole 401 form a magnetic attraction. When the medium pressure is insufficient to drive the connecting end of the valve disc 300 to fully fit with the mating end of the valve seat 400, the magnetic attraction force can provide additional closing driving force to ensure the tight contact between the valve disc 300 and the valve seat 400, thereby further ensuring the sealing contact between the mating end and the connecting end, thus maintaining the effective fit and sealing of the sealing pair to enhance the sealing performance.

[0056] In summary, the stepped mating end of the valve seat 400, through a multi-stage sealing design, forms a composite sealing structure with the outer sleeve sealing element. Under low-pressure or low-differential-pressure conditions, the dual action of mechanical and elastic seals ensures tight contact and fit between the valve disc 300 connection end and the mating end, solving the problem of incomplete sealing caused by insufficient pressure in traditional hard seals, thus improving sealing reliability. The interlocking and matching structure of the mating end and the connection end, combined with the magnetic limit, further enhances the sealing performance of the sealing pair formed by the valve disc 300 and the valve seat 400, ensuring the stability and reliability of the seal, reducing the risk of media leakage due to seal failure, and ensuring efficient and stable system operation.

[0057] 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 flanged 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 an inlet and an outlet are respectively formed at both ends of the flow channel, and the valve disc is rotatably mounted within the flow channel via a rotating component, characterized in that: The flow channel is internally connected to a valve seat, which is installed in the flow channel near the inlet via a connector. The valve seat has a through hole that communicates with the flow channel. The end of the valve seat has a stepped mating end that extends toward the valve disc. A sealing element is fitted on the outside of the mating end. The valve disc can be adjusted relative to the valve seat by a rotating element. The surface of the valve disc has a connecting end that engages with the mating end. The connecting end has a groove inside, and the bottom wall of the groove has a first magnetic attraction structure. The inner wall of the through hole is connected to a second magnetic attraction structure that magnetically limits the movement of the magnetic attraction structure. This allows the valve disc to form a sealing pair by mating the connecting end and the mating end, and to cover the through hole. The rotation of the rotating element allows the valve disc to control the opening and closing of the through hole, thus isolating the inlet and outlet.

2. The flange swing check valve according to claim 1, characterized in that: The valve body has an internal fitting portion for mating and installing valve seats. The valve seats are mated and inserted into the fitting portion. The mating end includes a mating portion, a first sealing protrusion and a second sealing protrusion. The cross-sections of the mating portion, the first sealing protrusion and the second sealing protrusion are arranged in a stepped manner. The first sealing protrusion and the second sealing protrusion have a first sealing groove and a second sealing groove for mating and holding the installation of the sealing element.

3. The flange swing check valve according to claim 2, characterized in that: The sealing element includes a first sealing ring and a second sealing ring, which are paired and sleeved on the mating end, and are respectively paired and engaged with the first sealing groove and the second sealing groove.

4. The flange swing check valve according to claim 3, characterized in that: The inner wall of the groove is formed with a first retaining portion and a second retaining portion that are respectively paired with the first sealing protrusion and the second sealing protrusion. The first retaining portion and the second retaining portion are respectively provided with a first sealing portion and a second sealing portion that make sealing contact with the first sealing ring and the second sealing ring.

5. The flange swing check valve according to claim 1, characterized in that: The first magnetic attraction structure is composed of a ring magnet, which is installed in pairs on the bottom wall of the groove. The second magnetic attraction structure is composed of multiple magnet blocks, which are installed in a circumferentially spaced array on the inner wall of the through hole. The ends of the magnet blocks near the valve disc form a magnetic attraction part that is magnetically paired with the ring magnet.

6. A flanged swing check valve according to any one of claims 1-5, characterized in that: The inner wall of the flow channel has raised guide protrusions that extend in a streamlined shape from the end of the flow channel near the inlet to the outlet.

7. A flange swing check valve according to any one of claims 1-5, characterized in that: A connecting post is formed on the side of the valve disc. The rotating component includes a rotating shaft and a hinge rod. The rotating shaft is paired with the valve body. One end of the hinge rod is installed with the rotating shaft through a hinge hole, and the other end of the hinge rod is paired with the connecting post through a connecting hole.

8. The flange swing check valve according to claim 7, characterized in that: The valve cover is installed on the valve body by bolts. A limit protrusion is formed on the inner side of the valve cover. The end of the limit protrusion extends toward the valve disc and a buffer pad is connected to the end of the limit protrusion.

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