Marine external high-pressure stop check valve

Abstract

The invention relates to the field of check valves, in particular to a marine external high-pressure stop check valve which comprises a driving mechanism used for operating and controlling plugging and dredging of a medium. The cut-off mechanism is used for blocking and dredging a medium, and the driving mechanism is arranged on the cut-off mechanism; the flow control mechanism is used for carrying out flow control treatment on the introduced cut-off, and the flow control mechanism is arranged in the cut-off mechanism; according to the external high-pressure stop check valve for the ship, the curved surface part of the bottom of the bottom curved handle and the diagonal line of the rhombic disc are collinear, the other parts of the bottom end of the bottom curved handle are all vertical faces, and therefore under the action of the bottom curved handle, the bottom curved handle can be fixed to the rhombic disc, and the bottom curved handle is fixed to the rhombic disc. And the rhombic disc is locked by the bottom curved handle, so that the rhombic disc is prevented from transversely deflecting, and the transition rod stably moves downwards or upwards.

Description

Technical Field

[0001] The invention relates to the technical field of check valves, in particular to a marine external high-pressure stop check valve. Background Art

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

[0003] Existing stop check valves have the following problems: rust, welding slag, solid particles, etc. in the medium are stuck between the valve core and the valve seat, causing the valve core to be unable to fall into place, or the valve stem to be stuck and unable to rotate; the valve core will be impacted by the medium after it stops, causing friction between the operating rod and the rod sleeve, and in severe cases, causing wear on the threads. Summary of the Invention

[0004] The present invention provides a marine external high-pressure stop check valve to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: a marine external high-pressure stop check valve, comprising a driving mechanism for controlling the blocking and unblocking of a medium; A cut-off mechanism for sealing and unblocking the medium, wherein the driving mechanism is arranged on the cut-off mechanism; A flow control mechanism for controlling the flow of the cutoff valve, the flow control mechanism being arranged inside the cutoff mechanism; The driving mechanism includes a flange, a support frame is fixedly mounted 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 an operator to seal and dredge the medium, and is internally connected to the threaded rod through a coupling.

[0006] Preferably, an inner connecting rod is inserted into the central portion of the threaded rod, a sleeve plate is fixedly connected to the top of the inner connecting rod, and a square plate is fixedly connected to the bottom of the sleeve plate away from one end of the inner connecting rod.

[0007] Preferably, the inner end of the threaded rod is extruded and adapted with a bearing, a transition rod is fixedly installed on the outer side of the bearing, L-shaped arc grooves are opened on both sides of the transition rod, wherein the two L-shaped arc grooves are arranged in a centrally symmetrical form, and the inner sliding of the L-shaped arc groove is adapted with a slider.

[0008] Preferably, one end of the slider away from the L-shaped arc groove is fixedly connected to a diamond-shaped disk, the diamond-shaped disk is rotatably mounted on the flange, and a bottom curved handle is inserted on the outer side of the diamond-shaped disk; One side of the bottom of the bottom curved handle has a curved surface, and a No. 1 limit seat is squeezed and adapted at the bottom thereof, and the No. 1 limit seat is fixedly mounted on the outer side of the flange; One side of the bottom curved surface of the bottom curved handle faces away from or toward the transition rod, so as to limit the position of the diamond-shaped disk.

[0009] Preferably, a No. 2 limit seat is fixedly connected to the outer side of the flange, wherein the No. 2 limit seat is embedded and matched with the bottom curved handle driven and deflected by the diamond-shaped disk, and is used for limiting the transition rod and the threaded rod.

[0010] Preferably, the shut-off mechanism comprises a valve body, the top of the valve body is connected to the flange via a fastener, a valve core is slidably adapted inside the valve body, and the top of the valve core is fixedly connected to the transition rod; The valve core is used to dredge and cut off the medium.

[0011] Preferably, the outer side of the valve core is fixedly connected to a leak-proof ring, and the outer side of the leak-proof ring is sleeved with a sleeve ring, wherein the number of sleeve rings is several and they are sleeved together in sequence, and the sleeve ring at the top is fixedly connected to the inner wall of the valve body; The leak-proof sticking ring and the sleeve ring are used to block the flow of the medium that partially overflows during the downward movement of the valve core.

[0012] Preferably, the interior of the valve core is plugged into the inner connecting rod, and a tough clamp is fixedly connected to the inner wall of the valve core, wherein the number of the tough clamps is several; The outer side of the inner connecting rod is provided with a plurality of grooves, and the grooves are fitted with the tough clamp to limit and position the inner connecting rod.

[0013] Preferably, a 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; The guide groove is used to reduce the direct erosion of the medium on the sealing surface, while the sealing ring is used to block the medium.

[0014] Preferably, a bottom connecting column is fixedly installed at the bottom of the valve core, a connecting strip is fixedly connected to the outer side of the bottom connecting column, and a double-sided scraper is fixedly connected to the end of the connecting strip away from the bottom connecting column, wherein the upper and lower surfaces of the double-sided scraper are both blade-shaped and are used to clean impurities remaining on the inner wall of the valve body due to the flushing of the medium.

[0015] Preferably, one end of the double-sided scraper close to the connecting strip is fixedly connected to a traction ring, wherein the traction ring is set below the connecting strip, and one end of the traction ring away from the double-sided scraper is threadedly connected to a filter basket; The traction ring is used to guide and pull the scraped impurities, and the impurities are collected and processed by the filter basket.

[0016] Preferably, the flow control mechanism includes a support shaft seat, 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; A through hole is provided on the top of the valve body, and the through hole is slidably fitted with the square plate, and the bottom end of the square plate is squeezed and fitted with the flow control plate.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. Move the slider to the top of the L-shaped arc groove, and then manually rotate the diamond disk counterclockwise so that it will move the slider along the groove body at the top of the L-shaped arc groove to the other end. At this time, the slider will limit the transition rod that has moved down to the maximum distance, thereby pre-limiting the transition rod.

[0018] 2. When the threaded rod moves upward with the transition rod to the limit position, the slider will be in the groove at the bottom of the L-shaped arc groove. Then, the diamond 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 pre-limit the rising transition rod.

[0019] 3. The curved portion at the bottom of the bottom curved handle is collinear with the diagonal of the diamond disk, while the rest of the bottom end of the bottom curved handle is a vertical surface. Therefore, under the action of the bottom curved handle, the diamond disk is locked by the bottom curved handle to prevent it from lateral deflection, thereby allowing the transition rod to move downward or upward stably.

[0020] 4. The double-sided scraper will move downward through the connecting strip, thereby scraping off the medium that has previously flowed on the inner wall of the valve body. At the same time, it can also remove impurities with a certain viscosity in the medium. In addition, it can also prevent the sealing ring from being damaged by friction with impurities, resulting in a gap between the valve core and the valve body, which makes it impossible to block the medium.

[0021] 5. The square plate passes through the perforation and squeezes the flow control plate downward. The squeezed flow control plate deflects downward with the fixed axis inside the support shaft seat as the fulcrum, stretching the return spring. The downward deflection of the flow control plate reduces the flow area of ​​the valve body's liquid inlet and indirectly reduces the medium flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The figure is a schematic diagram of the external structure of a marine external high-pressure stop check valve according to the present invention.

[0023] Figure 2 It is a schematic cross-sectional structural diagram of the present invention as a whole.

[0024] Figure 3 Schematic diagram of the structure of the driving mechanism of the present invention.

[0025] Figure 4 It is a schematic cross-sectional structural diagram of the first component of the driving mechanism of the present invention.

[0026] Figure 5 It is a schematic cross-sectional structural diagram of the driving mechanism of the present invention.

[0027] Figure 6 It is a schematic cross-sectional structural diagram of the second component of the driving mechanism of the present invention.

[0028] Figure 7 It is a structural schematic diagram of the cut-off mechanism of the present invention.

[0029] Figure 8 It is a partial cross-sectional structural schematic diagram of the cut-off mechanism of the present invention.

[0030] Figure 9 It is an enlarged structural diagram of some components of the cut-off mechanism of the present invention.

[0031] Figure 10 It is a schematic cross-sectional structural diagram of the cut-off mechanism of the present invention.

[0032] Figure 11 It is a schematic cross-sectional structural diagram of the flow control mechanism of the present invention.

[0033] In the figure: 1. driving mechanism; 2. shut-off mechanism; 3. flow control mechanism; 11. flange; 12. supporting 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-shaped disc; 104. bottom curved handle; 105. No. 1 limit seat; 106. No. 2 limit seat; 21. valve body; 22. valve core; 23. leak-proof ring; 24. sleeve ring; 25. toughness clamp; 26. guide groove; 27. sealing ring; 28. bottom connecting column; 29. ​​connecting strip; 20. double-sided scraper; 201. traction ring; 202. filter basket; 31. perforation; 32. support shaft seat; 33. flow control plate; 34. return spring. DETAILED DESCRIPTION

[0034] The present invention is further described below in conjunction with 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 noted that the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0035] See also Figures 1 to 11 , the present invention provides a technical solution: Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 As shown, it includes a driving mechanism 1 for controlling the blocking and unblocking of the medium; A cut-off mechanism 2 for sealing and unblocking the medium, wherein the driving mechanism 1 is arranged on the cut-off mechanism 2; The flow control mechanism 3 is used for controlling the flow of the incoming cutoff, and the flow control mechanism 3 is arranged in the cutoff mechanism 2.

[0036] The driving mechanism 1 includes a flange 11, a support frame 12 is fixedly mounted 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; The valve disc 15 is driven by the operator to block and dredge the medium, and is internally connected to the threaded rod 14 through a coupling; An inner connecting 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 connecting rod 16. A square plate 18 is fixedly connected to the bottom of the sleeve plate 17 away from the end of the inner connecting rod 16. The inner end of the threaded rod 14 is extruded with a bearing 19, and a transition rod 10 is fixedly installed on the outer side of the bearing 19. L-shaped arc grooves 101 are opened on both sides of the transition rod 10, wherein the two L-shaped arc grooves 101 are arranged in a centrally symmetrical form, and a slider 102 is slidably adapted inside the L-shaped arc grooves 101; The end of the slider 102 away from the L-shaped arc groove 101 is fixedly connected to a diamond disk 103, which is rotatably mounted on the flange 11, and a bottom crank handle 104 is inserted on the outer side of the diamond disk 103; by rotating the valve disc 15 forward, the threaded rod 14 connected to it through the coupling will move downward along the internal threaded sleeve 13, wherein the support frame 12 is used to support the internal threaded sleeve 13 and stabilize the entire device, and then the transition rod 10 connected to the threaded rod 14 through the bearing 19 will move downward accordingly, wherein the transition rod 10 An L-shaped arc groove 101 is provided on the surface of the rod 10. Therefore, as the transition rod 10 moves downward, the slider 102 slidingly adapted inside the L-shaped arc groove 101 will slide relatively until the slider 102 moves to the top of the L-shaped arc groove 101. Then, the diamond disk 103 is manually rotated counterclockwise so that it will carry the slider 102 along the groove body 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 down to the maximum distance, thereby playing a role in pre-limiting the transition rod 10.

[0037] Similarly, when the threaded rod 14 moves upward with the transition rod 10 to the extreme position, the slider 102 will be in the groove body 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 groove body at the bottom of the L-shaped arc groove 101, so as to pre-limit the rising transition rod 10.

[0038] One side of the bottom of the bottom curved handle 104 has a curved surface, and a No. 1 limit seat 105 is squeezed and adapted at the bottom thereof, and the No. 1 limit seat 105 is fixedly mounted on the outer side of the flange 11; The diamond disk 103 is limited by pointing one side of the bottom curved surface of the bottom curved handle 104 toward the transition rod 10; when the slider 102 is in the longitudinal groove body of the L-shaped arc groove 101, the bottom curved handle 104 is passed through the No. 1 limit seat 105, and the bottom curved handle 104 is rotated ninety degrees counterclockwise or clockwise, so that the curved surface part of the bottom of the bottom curved handle 104 is collinear with the diagonal line of the diamond disk 103, and the rest of the bottom end of the bottom curved handle 104 is a vertical surface. Therefore, under the action of the bottom curved handle 104, the diamond disk 103 is locked by the bottom curved handle 104 to prevent it from lateral deflection, thereby allowing the transition rod 10 to move downward or upward stably.

[0039] A second limit seat 106 is fixedly connected to the outer side of the flange 11. The second limit seat 106 is fitted with the bottom curved handle 104, which is driven by the diamond-shaped disk 103 to deflect, and is used to limit the transition rod 10 and the threaded rod 14. Similarly, when the diamond-shaped 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 the top of the second limit seat 106. At the same time, the structural characteristics of the bottom curved handle 104 are used to limit and lock the diamond-shaped disk 103, and at the same time, the transition rod 10 is also limited and locked, thereby limiting the transition rod 10 and increasing its stability. In order to change the bottom curved handle 104 from the No. 1 limit seat 105 to the No. 2 limit seat 106, the curved surface part of its bottom needs to be perpendicular to the diagonal of the diamond disk 103, and the curved surface part is facing the No. 2 limit seat 106. Through the counterclockwise rotation of the diamond disk 103, the curved surface part of the bottom of the bottom curved handle 104 will squeeze the No. 1 limit seat 105 and extend upward, and then along the top of the No. 1 limit seat 105 and the No. 2 limit seat 106, and finally fit together with the No. 2 limit seat 106. After fitting, the curved surface part of the bottom of the bottom curved handle 104 needs to be collinear with the diagonal of the diamond disk 103.

[0040] 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 the valve body 21 is connected to the flange 11 by fasteners, the interior of the valve body 21 is slidably adapted to be fitted with a valve core 22, and the top of the valve core 22 is fixedly connected to the transition rod 10; The valve core 22 is used to dredge and intercept the medium; The outer side of the valve core 22 is fixedly connected to a leak-proof ring 23, and the outer side of the leak-proof ring 23 is sleeved with a sleeve ring 24, wherein the number of sleeve rings 24 is several, and they are sleeved together in sequence, and the sleeve ring 24 at the top is fixedly connected to the inner wall of the valve body 21; The anti-leakage ring 23 and the sleeve ring 24 are used to block the medium that partially overflows during the downward movement of the valve core 22; The interior of the valve core 22 is plugged into the inner connecting rod 16, and a flexible clamp 25 is fixedly connected to the inner wall of the valve core 22, wherein the number of the flexible clamp 25 is several; The outer side of the inner connecting rod 16 is provided with a plurality of grooves, and the grooves are fitted with the tough clamp 25 to limit and position the inner connecting rod 16; A guide groove 26 is provided on the outside of the valve core 22, and a sealing ring 27 is squeezed and adapted on the outside of the valve core 22; The guide groove 26 is used to reduce the direct erosion of the medium on the sealing surface, while the sealing ring 27 is used to block the medium; A bottom connecting column 28 is fixedly installed at the bottom of the valve core 22, and a connecting strip 29 is fixedly connected to the outer side of the bottom connecting column 28. The threaded rod 14 drives the transition rod 10 to move downward, so that the valve core 22 fixedly installed at the bottom of the transition rod 10 will move downward along the inner wall of the valve body 21 until the flow opening at the center of the valve body 21 is blocked. In addition, the bottom connecting column 28 fixedly connected to the bottom of the valve core 22 will also move downward with the connecting strip 29, and then the connecting strip 29 will move downward with the double-sided scraper 20, thereby scraping the medium that has previously flowed on the inner wall of the valve body 21, and at the same time, it can also remove impurities with a certain viscosity in the medium. In addition, it also avoids the friction between the sealing ring 27 and the impurities and causes damage, resulting in a gap between the valve core 22 and the valve body 21, which makes it impossible to block the medium. The end of the connecting strip 29 away from the bottom connecting post 28 is fixedly connected to a double-sided scraper 20, wherein the upper and lower surfaces of the double-sided scraper 20 are both blade-shaped and are used to clean the impurities remaining on the inner wall of the valve body 21 after the medium is flushed; One end of the double-sided scraper 20 close to the connecting bar 29 is fixedly connected to a traction ring piece 201, wherein the traction ring piece 201 is set below the connecting bar 29, and the end of the traction ring piece 201 away from the double-sided scraper 20 is threadedly connected to a filter basket 202; when the double-sided scraper 20 moves downward, it will scrape off impurities downward and discharge the impurities from the bottom of the valve body 21, and when the double-sided scraper 20 moves upward, the impurities will enter the filter basket 202 along the top of the double-sided scraper 20 and along the traction ring piece 201, wherein the filter basket 202 is detachable, thereby filtering and collecting impurities.

[0041] The traction ring 201 is used to guide and pull the scraped impurities, and the impurities are collected and processed by the filter basket 202.

[0042] The flow control mechanism 3 includes a support shaft seat 32, inside which a flow control plate 33 is rotatably mounted via a fixed axis. A return spring 34 is fixedly connected to the top of the flow control plate 33, and the top end of the return spring 34 is fixedly connected to the inner wall of the valve body 21. The top of the valve body 21 is provided with a through-hole 31, which slides into the square plate 18, and the bottom of the square plate 18 is pressed into the flow control plate 33. When the operator needs to control the flow of the medium, he or she only needs to press the sleeve plate 17 downward, causing the inner connecting rod 16 and the square plate 18 connected to the bottom thereof to move downward. The inner connecting rod 16 extends further into the interior of the valve core 22 and engages with the flexible clamp 25, which has a certain degree of flexibility. At the same time, the square plate 18 passes through the through-hole 31 and squeezes the flow control plate 33 downward. The squeezed flow control plate 33 deflects downward with the fixed axis inside the support shaft seat 32 as the fulcrum, stretching the return spring 34. The downward deflection of the flow control plate 33 reduces the flow area of ​​the liquid inlet of the valve body 21, thereby indirectly reducing the flow of the medium. The inner connecting rod 16 and the square plate 18 complement each other. The inner connecting rod 16 is clamped by the flexible clamping head 25 so that the inner connecting rod 16 can stably squeeze and deflect the flow control plate 33 .

[0043] When the present invention is in use: first, the valve disc 15 is rotated forward, so that the threaded rod 14 connected to it through a coupling will move downward along the internal threaded sleeve 13, and then the transition rod 10 connected to the threaded rod 14 through the bearing 19 will move downward accordingly, wherein the surface of the transition rod 10 is provided with an L-shaped arc groove 101, so as the transition rod 10 moves downward, the slider 102 slidingly adapted inside the L-shaped arc groove 101 will slide relative to each other until the slider 102 moves to the top of the L-shaped arc groove 101, and then the diamond disc 103 is manually rotated counterclockwise so that it will carry the slider 102 along the groove body at the top of the L-shaped arc groove 101 to the other end, and at this time the slider 102 will limit the transition rod 10 that has moved down to the maximum distance. Similarly, when the threaded rod 14 moves upward with the transition rod 10 to the extreme position, the slider 102 will be in the groove body 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 groove body at the bottom of the L-shaped arc groove 101 to pre-limit the rising transition rod 10.

[0044] When the slider 102 is within the longitudinal groove of the L-shaped arc groove 101, the bottom curved handle 104 is passed through the first limit seat 105 and rotated 90 degrees counterclockwise or clockwise, so that the curved surface portion of the bottom of the bottom curved handle 104 is collinear with the diagonal of the diamond disk 103, while the remaining portion of the bottom end of the bottom curved handle 104 is a vertical surface. Therefore, under the action of the bottom curved handle 104, the diamond disk 103 is locked by the bottom curved handle 104, preventing it from lateral deflection and allowing the transition rod 10 to move up and down stably. Similarly, when the diamond 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 moves to the top of the second limit seat 106, and at the same time, the structural characteristics of the bottom curved handle 104 are used to limit and lock the diamond disk 103, and at the same time, the transition rod 10 is also limited and locked. In order to change the bottom curved handle 104 from the No. 1 limit seat 105 to the No. 2 limit seat 106, the curved surface part of its bottom needs to be perpendicular to the diagonal of the diamond disk 103, and the curved surface part is facing the No. 2 limit seat 106. Through the counterclockwise rotation of the diamond disk 103, the curved surface part of the bottom of the bottom curved handle 104 will squeeze the No. 1 limit seat 105 and extend upward, and then along the top of the No. 1 limit seat 105 and the No. 2 limit seat 106, and finally fit together with the No. 2 limit seat 106. After fitting, the curved surface part of the bottom of the bottom curved handle 104 needs to be collinear with the diagonal of the diamond disk 103.

[0045] As the threaded rod 14 moves the transition rod 10 downward, the valve core 22, fixed to the bottom of the transition rod 10, moves downward along the inner wall of the valve body 21 until the flow opening at the center of the valve body 21 is blocked. Furthermore, the bottom connection post 28, fixed to the bottom of the valve core 22, also moves downward, carrying the connecting bar 29. The connecting bar 29 then moves the double-sided scraper 20 downward, scraping the medium that previously flowed over the inner wall of the valve body 21. As the double-sided scraper 20 moves downward, it scrapes away impurities and discharges them outward from the bottom of the valve body 21. As the double-sided scraper 20 moves upward, the impurities flow along the top of the scraper 20 and along the traction ring 201 into the filter basket 202.

[0046] When the operator needs to control the flow of the medium, he only needs to press the sleeve plate 17 downward, so that the inner rod 16 and the square plate 18 connected to the bottom thereof will move downward, wherein the inner rod 16 will extend further into the interior of the valve core 22 and engage with the tough clamp 25, and the tough clamp 25 has a certain toughness. At the same time, the square plate 18 will pass through the perforation 31 and squeeze the flow control plate 33 downward, and the squeezed flow control plate 33 will deflect downward with the fixed axis inside the support shaft seat 32 as the fulcrum, and stretch the return spring 34 to deflect the flow control plate 33 downward.

[0047] The above embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Various changes made by ordinary technicians in this field based on the above concepts without creative work fall within the scope of protection of the present invention.

Claims

1. A marine external high-pressure stop check valve, characterized in that: include: A driving mechanism for controlling the blocking and unblocking of the medium; A cut-off mechanism for sealing and unblocking the medium, wherein the driving mechanism is arranged on the cut-off mechanism; A flow control mechanism for controlling the flow of the cutoff valve, the flow control mechanism being arranged inside the cutoff mechanism; The driving mechanism includes a flange, a support frame is fixedly mounted 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 an operator to seal and dredge the medium, and is internally connected to the threaded rod through a coupling.

2. A marine external high-pressure stop check valve according to claim 1, characterized in that: An inner connecting rod is inserted into the central portion of the threaded rod, a sleeve plate is fixedly connected to the top of the inner connecting rod, and a square plate is fixedly connected to the bottom of the sleeve plate away from one end of the inner connecting rod.

3. A marine external high-pressure stop check valve according to claim 2, characterized in that: The inner end of the threaded rod is extruded with a bearing, and a transition rod is fixedly installed on the outer side of the bearing. L-shaped arc grooves are provided on both sides of the transition rod, wherein the two L-shaped arc grooves are arranged in a centrally symmetrical form, and the inner sliding of the L-shaped arc groove is adapted with a slider.

4. A marine external high-pressure stop check valve according to claim 3, characterized in that: The end of the slider away from the L-shaped arc groove is fixedly connected to a diamond plate, the diamond plate is rotatably mounted on the flange, and a bottom curved handle is inserted on the outer side of the diamond plate; One side of the bottom of the bottom curved handle has a curved surface, and a No. 1 limit seat is squeezed and adapted at the bottom thereof, and the No. 1 limit seat is fixedly mounted on the outer side of the flange; One side of the bottom curved surface of the bottom curved handle faces away from or toward the transition rod, so as to limit the position of the diamond-shaped disk.

5. The marine external high-pressure stop check valve according to claim 4, characterized in that: The outer side of the flange is fixedly connected with a No. 2 limit seat, wherein the No. 2 limit seat is embedded with the bottom curved handle driven and deflected by the diamond-shaped disk and is used for limiting the transition rod and the threaded rod.

6. The marine external high-pressure stop check valve according to claim 3, characterized in that: The shut-off mechanism includes a valve body, the top of which is connected to the flange via a fastener, a valve core is slidably adapted inside the valve body, and the top of the valve core is fixedly connected to the transition rod; The valve core is used to dredge and cut off the medium.

7. A marine external high-pressure stop check valve according to claim 6, characterized in that: The outer side of the valve core is fixedly connected to a leak-proof ring, and the outer side of the leak-proof ring is sleeved with a sleeve ring, wherein the number of sleeve rings is several and they are sleeved together in sequence, and the sleeve ring at the top is fixedly connected to the inner wall of the valve body; The leak-proof sticking ring and the sleeve ring are used to block the flow of the medium that partially overflows during the downward movement of the valve core.

8. The marine external high-pressure stop check valve according to claim 6, characterized in that: The interior of the valve core is plugged into the inner connecting rod, and the inner wall of the valve core is fixedly connected with a flexible clamp, wherein the number of the flexible clamps is several; The outer side of the inner connecting rod is provided with a plurality of grooves, and the grooves are fitted with the tough clamp to limit and position the inner connecting rod.

9. The marine external high-pressure stop check valve according to claim 6, characterized in that: A 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; The guide groove is used to reduce the direct erosion of the medium on the sealing surface, while the sealing ring is used to block the medium.

10. The marine external high-pressure stop check valve according to claim 6, characterized in that: A bottom connecting column is fixedly installed at the bottom of the valve core, a connecting strip is fixedly connected to the outer side of the bottom connecting column, and a double-sided scraper is fixedly connected to the end of the connecting strip away from the bottom connecting column, wherein the upper and lower surfaces of the double-sided scraper are both blade-shaped and are used to clean impurities remaining on the inner wall of the valve body due to the flushing of the medium.

11. A marine external high-pressure stop check valve according to claim 10, characterized in that: The end of the double-sided scraper close to the connecting strip is fixedly connected to a traction ring, wherein the traction ring is set below the connecting strip, and the end of the traction ring away from the double-sided scraper is threadedly connected to a filter basket; The traction ring is used to guide and pull the scraped impurities, and the impurities are collected and processed by the filter basket.

12. The marine external high-pressure stop check valve according to claim 6, characterized in that: The flow control mechanism includes a support shaft seat, 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; A through hole is provided on the top of the valve body, and the through hole is slidably fitted with the square plate, and the bottom end of the square plate is squeezed and fitted with the flow control plate.

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