A marine external high-pressure shut-off check valve

Abstract

This invention relates to the field of check valves, specifically a marine external high-pressure shut-off check valve, comprising a drive mechanism for controlling the blocking and unblocking of media; a shut-off mechanism for controlling the blocking and unblocking of media, the drive mechanism being disposed on the shut-off mechanism; and a flow control mechanism for controlling the flow rate of the incoming media, the flow control mechanism being disposed within the shut-off mechanism. The drive mechanism includes a flange, the top of which is fixedly mounted with a support frame. In this marine external high-pressure shut-off check valve, the curved surface at the bottom of the bottom curved handle is collinear with the diagonal of the diamond-shaped disc, while the remaining portion at the bottom of the bottom curved handle is vertical. Therefore, under the action of the bottom curved handle, the diamond-shaped disc is locked by the bottom curved handle, preventing lateral deflection, thereby allowing the transition rod to move stably downwards or upwards.

Description

Technical Field

[0001] This invention relates to the field of check valve technology, specifically a marine external high-pressure shut-off check valve. Background Technology

[0002] A gate check valve is a multi-purpose valve that combines the functions of a gate valve and a check valve. Its structure is similar to a gate valve, but the valve stem and valve disc are not fixedly connected. When the valve stem descends and presses the valve disc firmly against the valve seat, it functions as a gate valve; when the valve stem rises, it functions as a check valve. In pipelines where both gate valves (or globe valves) and check valves are required (such as at the outlet of a water pump), or in locations where installation space is limited (such as on ships), using a gate check valve can save on installation costs and space.

[0003] The existing shut-off check valves have the following problems: rust, welding slag, solid particles, etc. in the medium can get stuck between the valve core and the valve seat, preventing the valve core from falling into place or the valve stem from being stuck and unable to rotate; after the valve core comes to rest, it will be impacted by the medium, which will cause friction between the operating rod and the rod sleeve, and in severe cases, it will cause wear on the threads. Summary of the Invention

[0004] The present invention provides a marine external high-pressure shut-off check valve to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a marine external high-pressure shut-off check valve, including a drive mechanism for controlling the blocking and unblocking of the medium;

[0006] A stop mechanism for sealing and unblocking media, wherein the drive mechanism is disposed on the stop mechanism;

[0007] A flow control mechanism for controlling the flow of the introduced medium, the flow control mechanism being disposed within the cut-off mechanism;

[0008] The drive mechanism includes a flange, a support frame is fixedly installed on the top of the flange, an internal threaded sleeve is fixedly connected to the top of the support frame, and a threaded rod is connected to the internal thread of the internal threaded sleeve.

[0009] The valve disc is driven by an operator to block and unclog the medium, and is internally connected to the threaded rod via a coupling.

[0010] Preferably, an inner rod is inserted into the center of the threaded rod, a sleeve plate is fixedly connected to the top of the inner rod, and a square plate is fixedly connected to the bottom of the sleeve plate at the end away from the inner rod.

[0011] Preferably, the inner end of the threaded rod is fitted with a bearing, and a transition rod is fixedly installed on the outer side of the bearing. Both sides of the transition rod are provided with L-shaped arc grooves, wherein the two L-shaped arc grooves are arranged in a centrally symmetrical manner, and the inner side of the L-shaped arc groove is fitted with a slider.

[0012] Preferably, a rhomboid disk is fixedly connected to one end of the slider away from the L-shaped arc groove, the rhomboid disk is rotatably mounted on the flange, and a bottom curved handle is inserted into the outer side of the rhomboid disk;

[0013] One side of the bottom of the bottom handle is curved, and a first limiting seat is fitted to the bottom of the handle. The first limiting seat is fixedly installed on the outside of the flange.

[0014] The bottom curved surface of the handle is positioned so that one side faces away from or towards the transition rod, thereby limiting the position of the diamond-shaped disc.

[0015] Preferably, a second limiting seat is fixedly connected to the outer side of the flange, wherein the second limiting seat is fitted and matched with the bottom curved handle that is deflected by the diamond-shaped disc, and is used for limiting the transition rod and the threaded rod.

[0016] Preferably, the shut-off mechanism includes a valve body, the top of which is connected to the flange by fasteners, and a valve core is slidably fitted inside the valve body, the top of which is fixedly connected to the transition rod.

[0017] The valve core is used for unblocking and intercepting the flow of the medium.

[0018] Preferably, a leak-proof sealing ring is fixedly connected to the outer side of the valve core, and a connecting ring is sleeved on the outer side of the leak-proof sealing ring. The number of connecting rings is several, and they are sleeved together in sequence. The uppermost connecting ring is fixedly connected to the inner wall of the valve body.

[0019] The anti-leakage ring and the sleeve ring are used to block the flow of some of the medium that overflows during the downward movement of the valve core.

[0020] Preferably, the valve core is inserted into the inner connecting rod, and the inner wall of the valve core is fixedly connected with a flexible clamp, wherein the number of flexible clamps is several.

[0021] The inner connecting rod has several grooves on its outer side, and the grooves fit into the flexible locking head to limit and position the inner connecting rod.

[0022] Preferably, a flow guide groove is provided on the outer side of the valve core, and a sealing ring is extruded and adapted on the outer side of the valve core;

[0023] The guide groove is used to reduce the direct scouring of the sealing surface by the medium, while the sealing ring provides a barrier to the medium.

[0024] Preferably, a bottom connecting post is fixedly installed at the bottom of the valve core, and a connecting strip is fixedly connected to the outer side of the bottom connecting post. A double-sided scraper is fixedly connected to the end of the connecting strip away from the bottom connecting post. The upper and lower sides of the double-sided scraper are both blade-shaped and are used to clean the impurities left on the inner wall of the valve body by the medium flushing.

[0025] Preferably, a traction ring is fixedly connected to one end of the double-sided scraper near the connecting strip, wherein the traction ring is located below the connecting strip, and a filter basket is threadedly connected to the other end of the traction ring away from the double-sided scraper.

[0026] The traction ring is used to guide and pull the scraped impurities, which are then collected and processed by the filter basket.

[0027] Preferably, the flow control mechanism includes a support shaft seat, and a flow control plate is rotatably mounted inside the support shaft seat via a fixed shaft. A return spring is fixedly connected to the top of the flow control plate, and the top end of the return spring is fixedly connected to the inner wall of the valve body.

[0028] The valve body has a perforation at the top, which is slidably adapted to the square plate, and the bottom end of the square plate is pressed and adapted to the flow control plate.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] 1. Move the slider to the top of the L-shaped groove, then manually rotate the diamond-shaped disk counterclockwise. This will cause the slider to move along the top of the L-shaped groove to the other end. At this point, the slider will limit the transition rod that has moved to its maximum distance, thus providing a pre-limiting effect for the transition rod.

[0031] 2. When the threaded rod moves upward to the limit position with the transition rod, the slider will be in the groove at the bottom of the L-shaped arc groove. Then, the diamond-shaped disk is rotated counterclockwise, and the slider will move to the other end of the groove at the bottom of the L-shaped arc groove, so as to perform a pre-limiting treatment on the transition rod after it rises.

[0032] 3. The curved part at the bottom of the bottom bend handle is collinear with the diagonal of the diamond-shaped disc, while the rest of the bottom of the bottom bend handle is a vertical surface. Therefore, under the action of the bottom bend handle, the diamond-shaped disc is locked by the bottom bend handle to prevent it from deflecting laterally, thereby allowing the transition rod to move stably downward or upward.

[0033] 4. The connecting strip will move the double-sided scraper downwards, thereby scraping off the medium that has previously flowed on the inner wall of the valve body. It can also remove impurities with a certain degree of viscosity in the medium. In addition, it can prevent the sealing ring from being damaged by friction with impurities, which would cause gaps between the valve core and the valve body and prevent the medium from being blocked.

[0034] 5. A square plate passes through the perforation and presses the flow control plate downward. The pressed flow control plate will deflect downward around the fixed shaft inside the support seat and stretch the return spring. The downward deflection of the flow control plate reduces the flow area of ​​the valve body inlet and indirectly reduces the flow rate of the medium. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the external structure of a marine external high-pressure shut-off check valve according to the present invention.

[0036] Figure 2 This is a cross-sectional view of the overall structure of the present invention.

[0037] Figure 3 This is a schematic diagram of the drive mechanism of the present invention.

[0038] Figure 4 This is a cross-sectional structural diagram of the first component of the driving mechanism of the present invention.

[0039] Figure 5 This is a cross-sectional structural schematic diagram of the driving mechanism of the present invention.

[0040] Figure 6 This is a cross-sectional structural schematic diagram of the second component of the driving mechanism of the present invention.

[0041] Figure 7 This is a schematic diagram of the structure of the stop mechanism of the present invention.

[0042] Figure 8 This is a partial cross-sectional view of the stopping mechanism of the present invention.

[0043] Figure 9 This is an enlarged structural schematic diagram of some components of the stop mechanism of the present invention.

[0044] Figure 10 This is a cross-sectional structural diagram of the stopping mechanism of the present invention.

[0045] Figure 11 This is a cross-sectional view of the flow control mechanism of the present invention.

[0046] In the diagram: 1. Drive mechanism; 2. Cut-off mechanism; 3. Flow control mechanism; 11. Flange; 12. Support frame; 13. Internal threaded sleeve; 14. Threaded rod; 15. Valve disc; 16. Internal connecting rod; 17. Sleeve plate; 18. Square plate; 19. Bearing; 10. Transition rod; 101. L-shaped arc groove; 102. Slider; 103. Diamond disc; 104. Bottom curved handle; 105. No. 1 limit seat; 106. No. 2 limit seat; 21. Valve body; 22. Valve core; 23. Leak-proof sealing ring; 24. Connecting ring; 25. Tough clamp; 26. Flow guide groove; 27. Sealing ring; 28. Bottom connecting column; 29. ​​Connecting strip; 20. Double-sided scraper; 201. Traction ring plate; 202. Filter basket; 31. Perforation; 32. Support shaft seat; 33. Flow control plate; 34. Return spring. Detailed Implementation

[0047] The present invention will now be further described with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. It should be understood that the described embodiments are merely some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0048] Please see Figures 1 to 11 The present invention provides a technical solution: such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, it includes a drive mechanism 1 for controlling the blocking and unblocking of the medium;

[0049] The stop mechanism 2 is used for blocking and unblocking the medium, and the drive mechanism 1 is installed on the stop mechanism 2;

[0050] The flow control mechanism 3 is used to control the flow of the incoming medium. The flow control mechanism 3 is located inside the cut-off mechanism 2.

[0051] The drive mechanism 1 includes a flange 11, a support frame 12 is fixedly installed on the top of the flange 11, an internal threaded sleeve 13 is fixedly connected to the top of the support frame 12, and a threaded rod 14 is connected to the internal thread of the internal threaded sleeve 13.

[0052] The valve disc 15 is driven by the operator to block and clear the medium, and is internally connected to the threaded rod 14 via a coupling;

[0053] An inner rod 16 is inserted into the center of the threaded rod 14. A sleeve plate 17 is fixedly connected to the top of the inner rod 16. A square plate 18 is fixedly connected to the bottom of the sleeve plate 17 at the end away from the inner rod 16.

[0054] The inner end of the threaded rod 14 is fitted with a bearing 19, and a transition rod 10 is fixedly installed on the outer side of the bearing 19. Both sides of the transition rod 10 are provided with L-shaped arc grooves 101, and the two L-shaped arc grooves 101 are arranged in a centrally symmetrical manner. The inner sliding adapter of the L-shaped arc groove 101 is fitted with a slider 102.

[0055] A rhomboid disc 103 is fixedly connected to the end of the slider 102 away from the L-shaped arc groove 101. The rhomboid disc 103 is rotatably mounted on the flange 11, and a bottom curved handle 104 is inserted into the outer side of the rhomboid disc 103. By rotating the valve disc 15 in the forward direction, the threaded rod 14, which is internally connected to it via a coupling, will move downwards along the internal threaded sleeve 13. The support frame 12 is used to support the internal threaded sleeve 13 and stabilize the entire device. Then, the transition rod 10, which is connected to the threaded rod 14 via a bearing 19, will move downwards accordingly. The surface of the rod 10 is provided with an L-shaped arc groove 101. Therefore, as the transition rod 10 moves downward, the slider 102, which is slidably fitted inside the L-shaped arc groove 101, will slide relative to the rod until the slider 102 moves to the top of the L-shaped arc groove 101. Then, the diamond-shaped disk 103 is manually rotated counterclockwise, so that it will move the slider 102 along the groove at the top of the L-shaped arc groove 101 to the other end. At this time, the slider 102 will limit the transition rod 10 that has moved to the maximum distance, thereby playing a pre-limiting role for the transition rod 10.

[0056] Similarly, when the threaded rod 14 moves upward to the limit position with the transition rod 10, the slider 102 will be in the groove at the bottom of the L-shaped arc groove 101. Then, the diamond disk 103 is rotated counterclockwise, and the slider 102 will move to the other end of the bottom groove of the L-shaped arc groove 101, so as to perform a pre-limiting treatment on the transition rod 10 after it rises.

[0057] One side of the bottom of the bottom of the bottom handle 104 is curved, and the bottom of the handle is fitted with a first limit seat 105, which is fixedly installed on the outside of the flange 11.

[0058] The bottom curved handle 104 is positioned so that one side of its curved surface faces away from or towards the transition rod 10, thereby limiting the movement of the rhombus-shaped disk 103. When the slider 102 is in the longitudinal groove of the L-shaped arc groove 101, the bottom curved handle 104 is passed through the first limiting seat 105 and rotated 90 degrees counterclockwise or clockwise, so that the curved surface at the bottom of the bottom curved handle 104 is collinear with the diagonal of the rhombus-shaped disk 103, while the rest of the bottom of the bottom curved handle 104 is a vertical surface. Therefore, under the action of the bottom curved handle 104, the rhombus-shaped disk 103 is locked by the bottom curved handle 104, preventing it from deflecting laterally, thereby allowing the transition rod 10 to move stably downward or upward.

[0059] A second limiting seat 106 is fixedly connected to the outer side of the flange 11. The second limiting seat 106 is fitted into the bottom curved handle 104, which is deflected by the rhomboid disc 103, and is used to limit the movement of the transition rod 10 and the threaded rod 14. Similarly, when the rhomboid disc 103 deflects counterclockwise and the slider 102 moves into the transverse groove of the L-shaped arc groove 101, the bottom curved handle 104 will move directly above the second limiting seat 106. At the same time, the structural characteristics of the bottom curved handle 104 are used to limit and lock the rhomboid disc 103, and also limit and lock the transition rod 10, thereby limiting the movement of the transition rod 10 and increasing its stability. When the bottom curved handle 104 is moved from the first limiting seat 105 to the second limiting seat 106, the curved part of its bottom surface needs to be perpendicular to the diagonal of the rhomboid disk 103, and the curved part should face the second limiting seat 106. By rotating the rhomboid disk 103 counterclockwise, the curved part of the bottom of the bottom curved handle 104 will press against the first limiting seat 105 and extend upwards. Then, along the top of the first limiting seat 105 and the second limiting seat 106, it will finally fit into the second limiting seat 106. After fitting, the curved part of the bottom of the bottom curved handle 104 should be collinear with the diagonal of the rhomboid disk 103.

[0060] like Figure 7 , Figure 8 , Figure 9 , Figure 10 and Figure 11 As shown, the shut-off mechanism 2 includes a valve body 21, the top of which is connected to the flange 11 by fasteners, and a valve core 22 is slidably fitted inside the valve body 21. The top of the valve core 22 is fixedly connected to the transition rod 10.

[0061] Valve core 22 is used for the unblocking and interception of the medium;

[0062] A leak-proof sealing ring 23 is fixedly connected to the outside of the valve core 22. A sleeve ring 24 is sleeved on the outside of the leak-proof sealing ring 23. There are several sleeve rings 24, which are sleeved together in sequence. The uppermost sleeve ring 24 is fixedly connected to the inner wall of the valve body 21.

[0063] The anti-leakage ring 23 and the sleeve ring 24 are used to block the flow of some of the medium that overflows during the downward movement of the valve core 22.

[0064] The valve core 22 is inserted into the inner rod 16, and the inner wall of the valve core 22 is fixedly connected with a flexible clamp 25, wherein there are several flexible clamps 25.

[0065] The inner connecting rod 16 has several grooves on its outer side, and the grooves fit into the flexible locking head 25 to limit and position the inner connecting rod 16.

[0066] A flow guide groove 26 is provided on the outer side of the valve core 22, and a sealing ring 27 is extruded and adapted on the outer side of the valve core 22.

[0067] The guide groove 26 is used to reduce the direct scouring of the sealing surface by the medium, while the sealing ring 27 provides a barrier to the medium.

[0068] A bottom connecting post 28 is fixedly installed at the bottom of the valve core 22. A connecting strip 29 is fixedly connected to the outside of the bottom connecting post 28. The threaded rod 14 moves the transition rod 10 downward, causing the valve core 22, which is fixedly installed at the bottom of the transition rod 10, to move downward along the inner wall of the valve body 21 until the flow port at the center of the valve body 21 is blocked. In addition, the bottom connecting post 28, which is fixedly connected to the bottom of the valve core 22, also moves downward with the connecting strip 29. Subsequently, the connecting strip 29 moves downward with the double-sided scraper 20, thereby scraping off the medium that has flowed on the inner wall of the valve body 21. At the same time, it can also remove impurities with a certain degree of viscosity in the medium. In addition, it can also prevent the sealing ring 27 from being damaged due to friction with impurities, which would cause a gap between the valve core 22 and the valve body 21 and prevent the medium from being blocked. A double-sided scraper 20 is fixedly connected to one end of the connecting strip 29 away from the bottom connecting post 28. Both the upper and lower sides of the double-sided scraper 20 are blade-shaped and are used to clean the impurities left on the inner wall of the valve body 21 by the medium flushing.

[0069] A traction ring 201 is fixedly connected to one end of the double-sided scraper 20 near the connecting bar 29. The traction ring 201 is located below the connecting bar 29. A filter basket 202 is threadedly connected to the other end of the traction ring 201 away from the double-sided scraper 20. When the double-sided scraper 20 moves downward, it scrapes impurities downward and discharges them from the bottom of the valve body 21. When the double-sided scraper 20 moves upward, impurities will enter the filter basket 202 along the top of the double-sided scraper 20 and along the traction ring 201. The filter basket 202 is detachable, thus serving the function of filtering and collecting impurities.

[0070] The traction ring 201 is used to guide and pull the scraped impurities, which are then collected and processed by the filter basket 202.

[0071] The flow control mechanism 3 includes a support seat 32, and a flow control plate 33 is rotatably mounted inside the support seat 32 via a fixed shaft. A return spring 34 is fixedly connected to the top of the flow control plate 33, and the top of the return spring 34 is fixedly connected to the inner wall of the valve body 21.

[0072] The valve body 21 has a perforation 31 at its top, which slides and adapts to the square plate 18. The bottom end of the square plate 18 is pressed and adapted to the flow control plate 33. When the operator needs to control the flow of the medium, he only needs to press down on the sleeve plate 17, so that the inner rod 16 and the square plate 18 connected to its bottom will move downward. The inner rod 16 will extend into the interior of the valve core 22 and engage with the flexible clamp 25, which has a certain degree of flexibility. At the same time, the square plate 18 will pass through the perforation 31 and press down on the flow control plate 33. The compressed flow control plate 33 will deflect downward around the fixed shaft inside the support seat 32 and stretch the return spring 34. Through the downward deflection of the flow control plate 33, the flow area of ​​the liquid inlet of the valve body 21 is reduced, and the medium flow is indirectly reduced. The inner rod 16 and the square plate 18 complement each other. The inner rod 16 is also connected to the flexible clamp 25 to allow the inner rod 16 to stably squeeze and deflect the flow control plate 33.

[0073] In use, the present invention is as follows: First, the valve disc 15 is rotated forward, causing the threaded rod 14, which is connected to it internally via a coupling, to move downward along the internal threaded sleeve 13. Then, the transition rod 10, which is connected to the threaded rod 14 via a bearing 19, moves downward accordingly. The surface of the transition rod 10 is provided with an L-shaped arc groove 101. Therefore, as the transition rod 10 moves downward, the slider 102, which is slidably fitted inside the L-shaped arc groove 101, will slide relative to the transition rod 102 until it moves to the top of the L-shaped arc groove 101. Then, the diamond disc 103 is manually rotated counterclockwise, causing it to move the slider 102 along the groove at the top of the L-shaped arc groove 101 to the other end. At this time, the slider 102 will limit the transition rod 10, which has moved to the maximum distance. Similarly, when the threaded rod 14 moves upward to the limit position with the transition rod 10, the slider 102 will be in the groove at the bottom of the L-shaped arc groove 101. Then, the diamond disk 103 is rotated counterclockwise, and the slider 102 will move to the other end of the bottom groove of the L-shaped arc groove 101 to pre-limit the rising transition rod 10.

[0074] When the slider 102 is in the longitudinal groove of the L-shaped arc groove 101, the bottom curved handle 104 is passed through the first limiting seat 105, and the bottom curved handle 104 is rotated 90 degrees counterclockwise or clockwise. This makes the curved part of the bottom of the bottom curved handle 104 collinear with the diagonal of the rhombus disk 103, while the rest of the bottom of the bottom curved handle 104 is a vertical surface. Therefore, under the action of the bottom curved handle 104, the rhombus disk 103 is locked by the bottom curved handle 104, preventing it from deflecting laterally, and allowing the transition rod 10 to move stably up and down. Similarly, when the rhombus disk 103 deflects counterclockwise and the slider 102 moves into the transverse groove of the L-shaped arc groove 101, the bottom curved handle 104 will move to directly above the second limiting seat 106. At the same time, the structural characteristics of the bottom curved handle 104 are used to limit and lock the rhombus disk 103, and also limit and lock the transition rod 10. When the bottom curved handle 104 is moved from the first limiting seat 105 to the second limiting seat 106, the curved part of its bottom surface needs to be perpendicular to the diagonal of the rhomboid disk 103, and the curved part should face the second limiting seat 106. By rotating the rhomboid disk 103 counterclockwise, the curved part of the bottom of the bottom curved handle 104 will press against the first limiting seat 105 and extend upwards. Then, along the top of the first limiting seat 105 and the second limiting seat 106, it will finally fit into the second limiting seat 106. After fitting, the curved part of the bottom of the bottom curved handle 104 should be collinear with the diagonal of the rhomboid disk 103.

[0075] The downward movement of the threaded rod 14, which carries the transition rod 10, causes the valve core 22, fixedly installed at the bottom of the transition rod 10, to move downward along the inner wall of the valve body 21 until the flow port at the center of the valve body 21 is blocked. Additionally, the bottom connecting post 28, fixedly connected to the bottom of the valve core 22, also moves downward along the connecting strip 29. Subsequently, the connecting strip 29 moves downward along the double-sided scraper 20, scraping away the previously flowing medium from the inner wall of the valve body 21. As the double-sided scraper 20 moves downward, it scrapes away impurities, causing them to discharge from the bottom of the valve body 21. Conversely, as the double-sided scraper 20 moves upward, impurities are scraped along the top of the scraper 20 and flow along the traction ring 201 into the filter basket 202.

[0076] When the operator needs to control the flow of the medium, simply press down on the sleeve plate 17, causing the inner rod 16 and the square plate 18 connected to its bottom to move downwards. The inner rod 16 will extend into the valve core 22 and engage with the flexible clamp 25, which has a certain degree of flexibility. At the same time, the square plate 18 will pass through the perforation 31 and press down on the flow control plate 33. The pressed flow control plate 33 will deflect downwards around the fixed shaft inside the support seat 32 and stretch the return spring 34.

[0077] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made by those skilled in the art based on the above concepts without creative effort shall fall within the scope of protection of the present invention.

Claims

1. A marine external high-pressure shut-off check valve, characterized in that, include: A drive mechanism used for controlling the blocking and unblocking of media; A stop mechanism for sealing and unblocking media, wherein the drive mechanism is disposed on the stop mechanism; A flow control mechanism for controlling the flow of the introduced medium, the flow control mechanism being disposed within the cut-off mechanism; The drive mechanism includes a flange, a support frame is fixedly installed on the top of the flange, an internal threaded sleeve is fixedly connected to the top of the support frame, and a threaded rod is connected to the internal thread of the internal threaded sleeve. The valve disc is driven by the operator to block and clear the medium, and is internally connected to the threaded rod via a coupling; An inner rod is inserted into the center of the threaded rod, and a sleeve plate is fixedly connected to the top of the inner rod. A square plate is fixedly connected to the bottom of the sleeve plate at the end away from the inner rod. The inner end of the threaded rod is fitted with a bearing, and a transition rod is fixedly installed on the outer side of the bearing. Both sides of the transition rod are provided with L-shaped arc grooves, and the two L-shaped arc grooves are arranged in a centrally symmetrical manner. The inner side of the L-shaped arc groove is fitted with a slider. The shut-off mechanism includes a valve body, the top of which is connected to the flange by fasteners, and a valve core is slidably fitted inside the valve body, the top of which is fixedly connected to the transition rod. The valve core is used for the unblocking and interception of the medium; A bottom connecting post is fixedly installed at the bottom of the valve core. A connecting strip is fixedly connected to the outside of the bottom connecting post. A double-sided scraper is fixedly connected to the end of the connecting strip away from the bottom connecting post. Both the upper and lower sides of the double-sided scraper are blade-shaped and are used to clean the impurities left on the inner wall of the valve body after the medium is flushed. The flow control mechanism includes a support shaft seat, and a flow control plate is rotatably mounted inside the support shaft seat via a fixed shaft. A return spring is fixedly connected to the top of the flow control plate, and the top end of the return spring is fixedly connected to the inner wall of the valve body. The valve body has a perforation at the top, which is slidably adapted to the square plate, and the bottom end of the square plate is pressed and adapted to the flow control plate.

2. The marine external high-pressure shut-off check valve according to claim 1, characterized in that: A rhomboid disk is fixedly connected to one end of the slider away from the L-shaped arc groove. The rhomboid disk is rotatably mounted on the flange. A bottom curved handle is inserted into the outer side of the rhomboid disk. One side of the bottom of the bottom handle is curved, and a first limiting seat is fitted to the bottom of the handle. The first limiting seat is fixedly installed on the outside of the flange. The bottom curved surface of the handle is positioned so that one side faces away from or towards the transition rod, thereby limiting the position of the diamond-shaped disc.

3. A marine external high-pressure shut-off check valve according to claim 2, characterized in that: A second limiting seat is fixedly connected to the outer side of the flange. The second limiting seat is fitted to the bottom curved handle that is deflected by the diamond-shaped plate and is used to limit the movement of the transition rod and the threaded rod.

4. A marine external high-pressure shut-off check valve according to claim 1, characterized in that: A leak-proof ring is fixedly connected to the outside of the valve core. A connecting ring is sleeved on the outside of the leak-proof ring. There are several connecting rings, which are sleeved together in sequence. The uppermost connecting ring is fixedly connected to the inner wall of the valve body. The anti-leakage ring and the sleeve ring are used to block the flow of some of the medium that overflows during the downward movement of the valve core.

5. A marine external high-pressure shut-off check valve according to claim 1, characterized in that: The valve core is inserted into the inner rod, and the inner wall of the valve core is fixedly connected with a flexible clamp, wherein there are several flexible clamps. The inner connecting rod has several grooves on its outer side, and the grooves fit into the flexible locking head to limit and position the inner connecting rod.

6. A marine external high-pressure shut-off check valve according to claim 1, characterized in that: The valve core has a flow guide groove on its outer side, and a sealing ring is extruded and fitted on the outer side of the valve core. The guide groove is used to reduce the direct scouring of the sealing surface by the medium, while the sealing ring provides a barrier to the medium.

7. A marine external high-pressure shut-off check valve according to claim 1, characterized in that: A traction ring is fixedly connected to one end of the double-sided scraper near the connecting strip, wherein the traction ring is located below the connecting strip, and a filter basket is threadedly connected to the other end of the traction ring away from the double-sided scraper. The traction ring is used to guide and pull the scraped impurities, which are then collected and processed by the filter basket.

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