Screw thread check valve

Abstract

The utility model relates to the technical field of mechanical valves, and discloses a screw thread check valve. Comprising a valve body, a valve clack and a valve cover, the top of the valve body is slidably connected with the valve cover, the valve clack is arranged in the valve body and used for preventing media from flowing back, the valve cover is used for opening or closing the valve body, the bottom of the valve clack is fixedly connected with one end of a first connecting block, and the other end of the first connecting block is fixedly connected with one end of a second connecting block; the other end of the second connecting block is fixedly connected with a sealing block, a first sealing ring is embedded in the top of the sealing block, a second sealing ring is embedded in the bottom of the sealing block, the valve body comprises a first protruding block and a second protruding block, the second protruding block is longer than the first protruding block, the first sealing ring is attached to the wall face of the first protruding block, and the second sealing ring is attached to the wall face of the second protruding block. The first sealing ring is used for sealing a gap between the first protruding block and the top of the sealing block, and the second sealing ring is used for sealing a gap between the second protruding block and the bottom of the sealing block. The utility model has the characteristic of preventing backflow.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical valves, and particularly relates to a threaded check valve. Background Technique

[0002] A threaded check valve is a one-way control device used in pipelines. The threaded check valve automatically opens and closes the valve flap relying on the flow of the medium itself, preventing the reverse flow of the medium. However, the threaded check valve in the prior art still has disadvantages in actual use. The threaded check valve is prone to the phenomenon of reduced sealing performance in high-pressure or long-term working environments. The wear of the sealing surface, the increase in the gap between the valve flap and the valve body, etc. will lead to poor sealing performance, resulting in problems such as medium leakage. In addition, the threaded check valve is prone to corrosion at the opening and closing connection of the valve flap and the valve body, reducing the service life of the valve flap. Secondly, the installation and maintenance of the threaded check valve are relatively cumbersome. Especially after long-term operation, the internal components of the threaded check valve are prone to failure, and its internal structure is relatively closed, making it difficult to disassemble and replace components. The existing threaded check valves have deficiencies in terms of sealing performance, corrosion resistance, maintenance convenience, and reliability.

[0003] Therefore, it is necessary to design a threaded check valve to solve the problems existing in the current technology. Content of the Utility Model

[0004] In view of this, the utility model provides a threaded check valve, aiming to solve the problems of insufficient sealing performance, corrosion resistance, maintenance convenience, and reliability of the existing threaded check valves.

[0005] The utility model provides a threaded check valve, comprising: a valve body, a valve flap, and a valve cover;

[0006] The valve cover is slidably connected to the top of the valve body, a valve flap is arranged inside the valve body, the valve flap is used to prevent the reverse flow of the medium, and the valve cover is used to open or close the valve body;

[0007] One end of a first connecting block is fixedly connected to the bottom of the valve flap, one end of a second connecting block is fixedly connected to the other end of the first connecting block, and one end of a sealing block is fixedly connected to the other end of the second connecting block;

[0008] A first sealing ring is embedded in the top of the sealing block, and a second sealing ring is embedded in the bottom of the sealing block;

[0009] The valve body comprises: a first convex block and a second convex block;

[0010] The length of the second convex block is longer than that of the first convex block;

[0011] The first sealing ring fits the wall surface of the first convex block, and the second sealing ring fits the wall surface of the second convex block;

[0012] The first sealing ring is used to seal the gap between the first bump and the top of the sealing block, and the second sealing ring is used to seal the gap between the second bump and the bottom of the sealing block.

[0013] Further, the screw check valve includes:

[0014] A first channel is provided inside the valve body, and the first channel is used to convey the medium;

[0015] A second channel is provided inside the valve body, and the second channel is used to connect to other pipes to discharge the medium, and the first channel is provided with threads.

[0016] Further, the screw check valve includes:

[0017] A first opening is provided at the threaded portion at the bottom of the first channel;

[0018] A second opening is provided in the second channel.

[0019] Further, the valve body further includes:

[0020] A support block, an inclined groove, a slide rail and a groove;

[0021] The support blocks are provided on both sides of the top of the valve body;

[0022] The inclined grooves are provided on both sides of the valve body;

[0023] The slide rails are provided on both sides inside the valve body;

[0024] The groove is provided at the bottom of the valve body.

[0025] Further, the valve cover further includes:

[0026] A pressing block and a sliding block;

[0027] The pressing blocks are provided on both sides of the valve cover, and the sliding blocks are provided on both sides of the valve cover;

[0028] The pressing blocks are symmetrically distributed with respect to the valve cover, and the sliding blocks are symmetrically distributed with respect to the valve cover.

[0029] Further, the screw check valve includes:

[0030] The support block is embedded with a gasket, the top of the gasket and the top of the support block are on the same horizontal plane, the top of the gasket fits against the pressing block, and the top of the support block fits against the pressing block;

[0031] A third bump is further provided inside the valve body, and the top of the third bump fits against the bottom of the valve cover.

[0032] Further, the valve body further includes: a pressure block;

[0033] The pressure block is placed between the slide rail and the third convex block. The pressure block is fixedly connected to the slide rail and is symmetrically distributed about the valve body.

[0034] Further, the screw check valve includes:

[0035] The top of the valve flap is fixedly connected to a rotating shaft. The top of the first connecting block is fixedly connected to the rotating shaft. The rotating shaft fits against the inner wall of the valve body and rotates inside the valve body.

[0036] Compared with the prior art, the sealing blocks of the valve flap are respectively embedded in the first sealing ring and the second sealing ring. The first sealing ring fits against the wall surface of the first convex block, and the second sealing ring fits against the wall surface of the second convex block. The length of the second convex block is longer than that of the first convex block, effectively utilizing the self-weight of the valve flap to prevent fluid leakage, ensuring that the valve flap can be immediately closed when the medium flows backward, thereby preventing the fluid from flowing back. Protected by the first sealing ring and the second sealing ring, the valve flap can be firmly pressed against the sealing position under the action of the reverse flow pressure, avoiding the problem of medium backflow caused by poor sealing, and enhancing the stability and reliability of the valve flap during operation. The embedded placement of the first sealing ring and the second sealing ring avoids them from being directly impacted or rubbed, thereby extending the service life of the first sealing ring and the second sealing ring. While reducing the maintenance frequency and cost, it also improves the continuous stability of the sealing effect. The multi-level connection structure provides higher stability. The hierarchical connection of the connecting blocks reduces the shaking of the valve flap during the opening or closing process, ensuring that the valve flap can maintain a good sealing contact state when subjected to pressure, and avoiding sealing failure or instability caused by shaking. The top of the valve body is slidably connected to the valve cover, facilitating the opening or closing operation of the valve cover, and making it easier to disassemble and install the valve body when maintenance or cleaning is required. The cooperation among the valve body, the valve flap, and the valve cover not only ensures the sealing effect under high-pressure conditions but also reduces the deformation under the action of impact force, enhancing the pressure resistance and impact resistance of the valve flap, thereby ensuring stable operation in harsh working environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0038] Figure 1 It is a schematic structural diagram of a front view cross-section of a screw check valve provided by an embodiment of the present invention;

[0039] Figure 2 Schematic structural diagram of the valve flap provided by the embodiment of the present utility model;

[0040] Figure 3 Schematic structural diagram of the front view section of the valve body provided by the embodiment of the present utility model;

[0041] Figure 4 Schematic structural diagram of the front view section of the valve cover provided by the embodiment of the present utility model.

[0042] In the figure: 1. Valve body; 2. Valve cover; 3. Valve flap; 4. First channel; 5. Second channel; 6. Gasket; 7. First opening; 8. Thread; 9. Second opening; 10. Rotating shaft; 11. First connecting block; 12. Second connecting block; 13. Sealing block; 14. First sealing ring; 15. Second sealing ring; 100. Support block; 101. Inclined groove; 102. Slide rail; 103. First convex block; 104. Second convex block; 105. Groove; 106. Third convex block; 107. Pressure block; 200. Compression block; 201. Sliding tightening block. Specific embodiments

[0043] The following combines the accompanying drawings and embodiments to further describe in detail the specific embodiments of the present utility model. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0044] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "front", "left", "right", "vertical", "horizontal", "front", "front", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0045] The terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0046] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0047] Referring to Figures 1-3 As shown, this embodiment provides a threaded check valve, including: a valve body 1, a valve flap 3, and a valve cover 2. The valve cover 2 is slidably connected to the top of the valve body 1. A valve flap 3 is arranged inside the valve body 1. The valve flap 3 is used to prevent the backflow of the medium. The valve cover 2 is used to open or close the valve body 1. One end of a first connection block 11 is fixedly connected to the bottom of the valve flap 3. The other end of the first connection block 11 is fixedly connected to one end of a second connection block 12. The other end of the second connection block 12 is fixedly connected to a sealing block 13. A first sealing ring 14 is embedded in the top of the sealing block 13. A second sealing ring 15 is embedded in the bottom of the sealing block 13. The valve body 1 includes: a first convex block 103 and a second convex block 104. The length of the second convex block 104 is longer than that of the first convex block 103. The first sealing ring 14 fits the wall surface of the first convex block 103. The second sealing ring 15 fits the wall surface of the second convex block 104. The first sealing ring 14 is used to seal the gap between the first convex block 103 and the top of the sealing block 13. The second sealing ring 15 is used to seal the gap between the second convex block 104 and the bottom of the sealing block 13.

[0048] Specifically, the valve body 1 is the housing of the screw check valve, which is connected to the valve cover 2. The interior of the valve body 1 has a passage that allows the medium to flow through. The passage not only supports the flow of the medium but also ensures that the valve flap 3 can open and close inside the valve body 1 without obstruction. The valve cover 2 is a detachable component that is connected to the top of the valve body 1 and is used to conveniently open or close the valve body 1, facilitating the inspection and replacement of the valve flap 3 and other sealing components. The sliding connection between the valve body 1 and the valve cover 2 enables the valve cover 2 to be flexibly detached when needed, facilitating daily maintenance. The valve flap 3 is installed inside the valve body 1 and serves to prevent the reverse flow of the medium. The valve flap 3 can open under sufficient medium pressure and quickly close when the medium flows back, ensuring the sealing effect. One end of the bottom of the valve flap 3 is fixedly connected to one end of the first connecting block 11, and the other end of the first connecting block 11 is fixedly connected to one end of the second connecting block 12. The first connecting block 11 and the second connecting block 12 not only improve the stability of the opening and closing of the valve flap 3 but also effectively transmit the pressure of the medium flow, enhancing the smoothness of the opening and closing of the valve flap 3. The other end of the second connecting block 12 is fixedly connected to the sealing block 13, enabling the opening and closing movement of the valve flap 3 to be transmitted to the sealing components. The top and bottom of the sealing block 13 are respectively embedded with a first sealing ring 14 and a second sealing ring 15. The first sealing ring 14 fits against the first convex block 103 of the valve body 1 for sealing the top of the valve body 1, and the second sealing ring 15 fits against the second convex block 104 of the valve body 1 to enhance the bottom sealing. The first sealing ring 14 and the second sealing ring 15 can completely contact the first convex block 103 and the second convex block 104 when the valve flap 3 is closed, effectively preventing the backflow of the medium.

[0049] It can be understood that the valve flap 3 uses its own weight to squeeze the first sealing ring 14 and the second sealing ring 15, causing the first convex block 103 to fit against the first sealing ring 14 and the second convex block 104 to fit against the second sealing ring 15, achieving the sealing of the valve flap 3. The first sealing ring 14 and the second sealing ring 15 are made of fluororubber, which has excellent corrosion resistance to many chemical substances, especially strong acids, strong alkalis, oils, fuels, and solvents. It is almost unaffected by hydrocarbon, aromatic, and olefinic chemical substances. Moreover, fluororubber has excellent oil resistance and fuel resistance and can resist the erosion of various lubricating oils, hydraulic oils, gasoline, and diesel fuel. It can maintain its physical properties unchanged during the transportation of media such as oils. Compared with other sealing materials, the molecular structure of fluororubber is very stable and is not easily affected by ultraviolet rays to cause cracking and aging. Moreover, fluororubber has high mechanical strength and moderate elasticity. Fluororubber is not easily deformed by the pressure generated by the medium flow and can still provide a lasting sealing effect under high-pressure conditions. The length of the second convex block 104 is longer than that of the first convex block 103, causing the valve flap 3 to have a certain inclination angle when closed, facilitating the valve flap 3 to use its own weight to squeeze the first sealing ring 14 and the second sealing ring 15 and enhancing the sealing effect.

[0050] In some examples of the present application, a threaded check valve includes: a first channel 4 is opened inside a valve body 1, the first channel 4 is used for conveying a medium, a second channel 5 is opened inside the valve body 1, the second channel 5 is used for connecting other pipes to discharge the medium, and a thread 8 is provided on the first channel.

[0051] It can be understood that the valve body 1 undertakes the guidance and control of the medium flow, and a first channel 4 is opened inside it for conveying the medium. A thread 8 is provided on the wall surface of the first channel 4, and its thread 8 structure is used to enhance the connection strength between the valve body 1 and other connecting pipes, ensuring a tight sealing effect during connection, effectively avoiding connection looseness caused by changes in medium pressure, and ensuring the reliability of the valve body 1 under different conditions. The second channel 5 in the threaded check valve is used to discharge the medium in a timely manner. When the medium impacts the valve flap 3 and enters the inside of the valve body 1, the medium begins to accumulate inside the valve body 1. When the accumulation reaches a certain level, the medium is discharged from the valve body 1 through the pipe connected to the second channel 5. In addition, the second channel 5 can also play a role in pressure relief. When abnormal pressure appears inside the valve body 1, the excess medium can be released to a safe area through the second channel 5, thereby reducing the load on the valve body 1 and protecting the threaded check valve. The second channel 5 provides convenience for daily maintenance and operation. When cleaning or inspecting the valve body 1, the residual medium inside the valve body 1 can be quickly discharged through the second channel 5, facilitating the inspection of the condition of the valve body 1 or its cleaning.

[0052] In some examples of the present application, a threaded check valve includes: a first opening 7 is provided at the threaded 8 at the bottom of the first channel 4, and a second opening 9 is provided in the second channel 5.

[0053] It can be understood that providing the first opening 7 at the bottom thread 8 can reduce the difficulty of alignment when installing or disassembling other connecting pipes and the valve body 1. In addition, the first opening 7 can disperse stress and reduce local stress concentration. Especially in the case of a pressure difference, the first opening 7 improves the overall strength of the first channel 4 and extends the service life of the first channel 4. In addition, the first opening 7 makes it easier for cleaning tools or maintenance tools to enter the inside of the first channel 4, thus facilitating the cleaning of foreign objects, lubrication, or repair. The first channel 4 not only bears the medium flow but also provides an effective anti-leakage function for the threaded check valve to ensure the overall sealing performance. A second opening 9 is provided in the second channel 5. The second opening 9 can reduce the difficulty of alignment when installing or disassembling other connecting pipes and the valve body 1.

[0054] In some examples of the present application, the valve body 1 further includes: a support block 100, an inclined groove 101, a slide rail 102, and a groove 105. Support blocks 100 are provided on both sides of the top of the valve body 1, inclined grooves 101 are opened on both sides of the valve body 1, slide rails 102 are provided on both sides inside the valve body 1, and a groove 105 is opened at the bottom of the valve body 1.

[0055] It can be understood that a support block 100 is provided on each side of the top of the valve body 1. The support block 100 not only enhances the overall stability of the valve body 1, but also provides an important supporting role for the valve body 1 to bear the load above. The support block 100 can resist the pressure and external force generated in the working state, thereby avoiding the risk of deformation or instability of the valve body 1, making the valve body 1 more stable during operation. The inclined grooves 101 are distributed on both sides of the valve body 1 to reduce the self-weight of the valve body 1. While maintaining the balance of the medium flow pressure, it prevents the connecting pipes from being damaged due to the self-weight of the valve body 1. The slide rail 102 inside the valve body 1 provides a sliding path for the valve cover 2, ensuring that the valve cover 2 can slide smoothly along the direction of the slide rail 102, reducing the wear on the valve body 1, and thus extending the service life of the valve body 1. In addition, the valve cover 2 can be opened smoothly through the slide rail 102, facilitating the maintenance of the internal components of the valve body 1. The groove 105 is provided at the bottom of the valve body 1 to store the medium that is not discharged in time, preventing the backflow of the medium and further enhancing the stability of the valve body 1.

[0056] Refer to Figure 4 As shown, in some examples of the present application, the valve cover 2 further includes: a pressing block 200 and a sliding and tightening block 201. The pressing blocks 200 are provided on both sides of the valve cover 2, and the sliding and tightening blocks 201 are provided on both sides of the valve cover 2. The pressing blocks 200 are symmetrically distributed with respect to the valve cover 2, and the sliding and tightening blocks 201 are symmetrically distributed with respect to the valve cover 2.

[0057] It can be understood that both the pressing block 200 and the sliding and tightening block 201 are symmetrically distributed on both sides of the valve cover 2. The pressing block 200 improves the pressing effect of the valve cover 2 in the working state. The symmetrical distribution of the pressing blocks 200 on both sides of the valve cover 2 enables them to apply the pressing force evenly, ensuring that the valve cover 2 and the valve body 1 are not affected by external pressure, guaranteeing the pressing effect, and avoiding the phenomenon of offset or deformation caused by excessive force on one side. When the valve body 1 bears the high pressure of the medium, any slight offset may lead to a decrease in the sealing performance of the screw check valve or an increase in the leakage risk. Secondly, the valve cover 2 is also provided with sliding and tightening blocks 201. The sliding and tightening blocks 201 are also symmetrically distributed on both sides of the valve cover 2. The function of the sliding and tightening blocks 201 is to provide guiding and fixing functions, enabling the valve cover 2 to slide smoothly to the correct position during installation or use, thereby simplifying the operation process and reducing the installation difficulty. The symmetrical distribution of the sliding and tightening blocks 201 helps the valve cover 2 not to offset or get stuck during the sliding process, improving the smoothness of the operation and the sealing performance of the valve cover 2.

[0058] In some examples of the present application, the threaded check valve includes: a gasket 6 embedded in the support block 100, the top of the gasket 6 and the top of the support block 100 are located in the same horizontal plane, the top of the gasket 6 fits the clamping block 200, the top of the support block 100 fits the clamping block 200, and a third protrusion 106 is also provided inside the valve body 1, and the top of the third protrusion 106 fits the bottom of the valve cover 2.

[0059] It can be understood that the support block 100 and the gasket 6 work together to bear the pressure of the valve cover 2. The support block 100 is located at the top of the valve body 1, providing strong support for the sealing and stability of the valve cover 2. The gasket 6 is embedded in the support block 100. The gasket 6 embedded in the support block 100 fits the clamping block 200, which is conducive to the valve cover 2 forming a reliable sealing state during the opening and closing process. The clamping block 200 is located above the gasket 6 and the support block 100, so that the valve cover 2 can maintain its internal stability in the closed state. The embedded gasket 6 reduces the risk of misalignment or displacement of the valve cover 2 during installation and operation, and prevents the sealing failure of the valve cover 2 due to changes in the internal pressure of the valve body 1, thereby ensuring that the valve cover 2 will not deform or wear during long-term use. The third protrusion 106 inside the valve body 1 further increases the structural stability of the valve cover 2. The third protrusion 106 not only provides support and fixation but also effectively absorbs the stress generated by pressure fluctuations within the valve cover 2, ensuring that stress is properly distributed during the opening and closing of the valve cover 2, thereby preventing deformation or damage to the valve cover 2. The synergistic effect of the support block 100, gasket 6, pressure block 200, third protrusion 106, and valve cover 2 ensures the threaded check valve's durability and reliability. This multi-layered support structure enhances the sealing performance of the valve cover 2 in various media environments.

[0060] In some examples of the present application, the valve body 1 further includes: a pressure block 107 , which is placed between the slide rail 102 and the third protrusion 106 , the pressure block 107 is fixedly connected to the slide rail 102 , and the pressure block 107 is symmetrically distributed about the valve body 1 .

[0061] It is understandable that a pressure block 107 is provided inside the valve body 1. The pressure block 107 is placed between the slide rail 102 and the third protrusion 106. The pressure block 107 can effectively transmit and disperse the pressure from the outside between the slide rail 102 and the third protrusion 106, reducing the risk of deformation of the valve body 1 under high load conditions. In addition, the symmetrical distribution of the pressure blocks 107 inside the valve body 1 improves the balance of the valve body 1 when subjected to external forces. The symmetrically distributed pressure blocks 107 can make the valve body 1 bear the force evenly when the pressure increases, thereby avoiding tilting or damage caused by excessive pressure on one side. The fixed connection of the pressure block 107 prevents it from shifting during use, so that the valve body 1 has good pressure resistance and impact resistance.

[0062] In some examples of the present application, a threaded check valve includes: a rotating shaft 10 fixedly connected to the top of a valve flap 3, and a first connecting block 11 fixedly connected to the top of the rotating shaft 10. The rotating shaft 10 fits against the inner wall of the valve body 1 and rotates inside the valve body 1.

[0063] Specifically, the rotating shaft 10 can not only stably fit against the inner wall of the valve body 1 inside the valve body 1, but also smoothly rotate inside the valve body 1. The rotation of the rotating shaft 10 inside the valve body 1 ensures the flexible opening and closing of the valve flap 3 during operation. When a medium impacts the first connecting block 11, the first connecting block 11 transfers the pressure to the valve flap 3, and the pressure pushes the first sealing ring 14 and the second sealing ring 15 of the sealing block 13 away from the first convex block 103 and the second convex block 104, causing the rotating shaft 10 to drive the valve flap 3 to rotate around itself and the medium to start passing through the valve body 1. When the pressure decreases or the flow rate slows down, the medium starts to flow in the reverse direction, and the reverse valve flap 3 resets under the action of gravity. The first and second sealing rings 15 respectively press against the first and second convex blocks 104 to achieve effective sealing, thereby preventing the medium from flowing back. The rotating shaft 10 not only ensures the efficient operation of the valve flap 3, but also enhances the sealing performance and resilience of the valve flap 3.

[0064] It can be understood that the fitting of the rotating shaft 10 against the inner wall of the valve body 1 plays a role in sealing and supporting the valve flap 3. The fitting of the rotating shaft 10 against the inner wall of the valve body 1 not only effectively prevents the leakage of the internal medium, but also ensures the stability of the rotating shaft 10 inside the valve body 1, thus avoiding shaking, wear or position deviation caused by long-term operation. The valve flap 3 can operate stably under different working conditions, improving the overall reliability of the threaded check valve. The presence of the rotating shaft 10 also provides a good force support for the operation of the valve flap 3. The valve flap 3 can better withstand the impact of the medium pressure and effectively complete the opening and closing actions under different pressures, reducing the maintenance frequency and cost of the valve flap 3.

[0065] In summary, the sealing blocks of the valve flap are respectively embedded with the first sealing ring and the second sealing ring, wherein the first sealing ring fits the wall surface of the first convex block, and the second sealing ring fits the wall surface of the second convex block. The length of the second convex block is longer than that of the first convex block, effectively utilizing the self-weight of the valve flap to prevent fluid leakage, ensuring that the valve flap can be immediately closed when the medium flows back, thereby preventing the fluid from flowing back. Protected by the first sealing ring and the second sealing ring, the valve flap can be firmly pressed against the sealing position under the action of the backflow pressure, avoiding the problem of medium backflow caused by poor sealing, and enhancing the stability and reliability of the valve flap during operation. The embedding placement of the first sealing ring and the second sealing ring avoids them from being directly impacted or rubbed, thereby prolonging the service life of the first sealing ring and the second sealing ring. While reducing the maintenance frequency and cost, it also improves the continuous stability of the sealing effect. The multi-level connection structure provides higher stability. The hierarchical connection of the connection blocks reduces the swaying of the valve flap during the opening or closing process, ensuring that the valve flap can maintain a good sealing contact state when subjected to pressure, and avoiding sealing failure or instability caused by swaying. The top of the valve body is slidably connected to the valve cover, facilitating the opening or closing operation of the valve cover, making it easier to disassemble and install the valve body when maintenance or cleaning is required. The cooperation among the valve body, the valve flap and the valve cover not only ensures the sealing effect under high-pressure conditions, but also reduces the deformation under the action of impact force, enhancing the pressure resistance and impact resistance of the valve flap, so as to ensure stable operation in a harsh working environment.

[0066] Those of ordinary skill in the art can understand that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A threaded check valve, characterized in that, Comprising: Valve body, valve flap and valve cover; The top of the valve body is slidably connected to the valve cover, a valve flap is arranged inside the valve body, the valve flap is used to prevent the medium from flowing back, and the valve cover is used to open or close the valve body; One end of a first connection block is fixedly connected to the bottom of the valve flap, the other end of the first connection block is fixedly connected to one end of a second connection block, and the other end of the second connection block is fixedly connected to a sealing block; A first sealing ring is embedded in the top of the sealing block, and a second sealing ring is embedded in the bottom of the sealing block; The valve body includes: a first convex block and a second convex block; The length of the second convex block is longer than that of the first convex block; The first sealing ring fits the wall surface of the first convex block, and the second sealing ring fits the wall surface of the second convex block; The first sealing ring is used to seal the gap between the first convex block and the top of the sealing block, and the second sealing ring is used to seal the gap between the second convex block and the bottom of the sealing block.

2. The threaded check valve according to claim 1, characterized in that, Comprising: A first channel is opened inside the valve body, and the first channel is used to convey the medium; A second channel is opened inside the valve body, and the second channel is used to connect other pipes to discharge the medium, and the first channel is provided with threads.

3. The threaded check valve according to claim 2, characterized in that, Comprising: A first opening is arranged at the threaded part at the bottom of the first channel; The second channel is provided with a second opening.

4. The threaded check valve according to claim 1, characterized in that, The valve body further includes: Support block, inclined groove, slide rail and groove; The support blocks are arranged on both sides of the top of the valve body; The inclined grooves are opened on both sides of the valve body; The slide rails are arranged on both sides inside the valve body; The groove is opened at the bottom of the valve body.

5. The threaded check valve according to claim 4, wherein The valve cover further includes: Pressing block and sliding block; The pressing blocks are arranged on both sides of the valve cover, and the sliding blocks are arranged on both sides of the valve cover; The pressing blocks are symmetrically distributed with respect to the valve cover, and the sliding blocks are symmetrically distributed with respect to the valve cover.

6. The threaded check valve according to claim 5, characterized in that, Comprising: A gasket is embedded in the support block, the top of the gasket and the top of the support block are on the same horizontal plane, the top of the gasket fits the pressing block, and the top of the support block fits the pressing block; A third convex block is further arranged inside the valve body, and the top of the third convex block fits the bottom of the valve cover.

7. The threaded check valve according to claim 6, characterized in that, The valve body further includes: a pressure block; The pressure block is placed between the slide rail and the third convex block, the pressure block is fixedly connected to the slide rail, and the pressure block is symmetrically distributed with respect to the valve body.

8. The threaded check valve according to claim 1, characterized in that, Comprising: The top of the valve flap is fixedly connected to a rotating shaft, the top of the first connection block is fixedly connected to the rotating shaft, the rotating shaft fits the inner wall of the valve body, and the rotating shaft rotates inside the valve body.

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