Corrosion-resistant valve for offshore petroleum transportation pipeline

Abstract

The utility model relates to the technical field of valves, in particular to a corrosion-resistant valve for an offshore petroleum transportation pipeline, which comprises a valve body and a rotary self-locking mechanism matched with the valve body for use, an O-shaped ball valve is rotatably connected to the middle of the valve body, a first pressure relief groove is arranged on the surface of one side of the middle of the O-shaped ball valve, and a second pressure relief groove is arranged on the surface of the other side of the middle of the O-shaped ball valve. A first pressure relief groove is formed in the top end of the valve body, a first pressure relief cover is slidably connected into the first pressure relief groove, a rotary self-locking mechanism used for opening and closing is arranged at the top end of the valve body, a pressure relief mechanism used for pressure relief is arranged in the O-shaped ball valve, and a protection mechanism used for protecting the O-shaped ball valve is arranged in the O-shaped ball valve. According to the device, pressure relief can be conducted on petroleum liquid, the pressure in a petroleum pipeline is reduced, impact force and pressure borne by the device are reduced, then the device is protected, faults of a whole fluid conveying system can be avoided, normal operation of the production process is guaranteed, and economic losses caused to users are reduced.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a corrosion-resistant valve for marine oil transportation pipelines. Background Technology

[0002] Submarine pipelines are pipelines laid on the seabed to transport oil and gas. As the "main artery" of marine oil transportation, the safe operation of submarine oil pipelines is of paramount importance. Corrosion-resistant valves are installed at different locations on the submarine pipeline, such as the starting point, ending point, branch points, and intermediate maintenance sections. The corrosion resistance requirements of corrosion-resistant valves installed at different locations are different.

[0003] All components of the corrosion-resistant valve undergo electroplating, forming a functional coating on the surface of each part. The valve is manufactured using arc additive manufacturing technology. Arc additive manufacturing, as an existing technology, involves heating a wire, stirring and flowing the molten pool locally, layer-by-layer deposition, cooling and solidification, continuous hot-cold cycles between layers, and mutual influence between different formation stages. Essentially, it is a weld structure, whose microstructure and properties are primarily determined by the wire material and the manufacturing process. These properties can be controlled by adjusting the heating and cooling rates, and further regulated by the process and subsequent heat treatment. Selecting or developing appropriate wires based on application requirements, and planning the additive manufacturing and heat treatment processes, can jointly regulate the microstructure and properties.

[0004] Traditional corrosion-resistant valves are not well-suited to handle water hammer effects, especially when liquids are transported over long distances. In severe cases, this can damage pipelines or corrosion-resistant valves, leading to malfunctions in the entire fluid transport system, disrupting normal production processes, and causing economic losses. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of the aforementioned background technology by proposing a corrosion-resistant valve for marine oil transportation pipelines.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a corrosion-resistant valve for marine oil transportation pipelines, comprising a valve body and a rotating self-locking mechanism used in conjunction with the valve body, wherein an O-type ball valve is rotatably connected to the middle of the valve body, a first pressure relief groove is provided on one side of the middle of the O-type ball valve, a first pressure relief cover is slidably connected inside the first pressure relief groove, a rotating self-locking mechanism for opening and closing is provided at the top of the valve body, a pressure relief mechanism for pressure relief is provided inside the O-type ball valve, and a protective mechanism for protecting the O-type ball valve is provided inside the O-type ball valve.

[0007] Preferably, the rotary self-locking mechanism includes a flange, a fixed sealing cover, a power transmission box, a fixed shaft, a valve stem, a worm gear, a worm, and a turntable. Flanges are fixedly connected to both ends of the valve body, a fixed sealing cover is fixedly connected to the top of the valve body, and a power transmission box is fixedly connected to the top of the fixed sealing cover. A fixed shaft is fixedly connected to the bottom of the O-type ball valve, and the fixed shaft is rotatably connected to the inner wall of the bottom of the valve body. A valve stem is fixedly connected to the top of the O-type ball valve, and the top of the valve stem passes through the fixed sealing cover and is connected to the inner wall of the top of the power transmission box via a bearing. A worm gear is fixedly connected to the top of the valve stem. A worm is connected inside the power transmission box via a bearing, and one end of the worm extends to the outside of the power transmission box. The worm meshes with the worm gear, and a turntable is fixedly connected to one end of the worm. This allows the user to easily open and close the device while also enabling self-locking.

[0008] Preferably, the pressure relief mechanism includes a second pressure relief groove, a pressure relief hole, a second pressure relief cover, a sliding connecting rod, a first spring, and a sealing sleeve. The second pressure relief groove is formed on the surface of the other side of the middle portion of the O-type ball valve. The second pressure relief cover is slidably connected inside the second pressure relief groove. Pressure relief holes are evenly distributed on the inner wall of the O-type ball valve, and one end of each pressure relief hole is connected to the second pressure relief groove. A sliding connecting rod is slidably connected to the middle portion of the O-type ball valve, and both ends of the sliding connecting rod are fixedly connected to the first pressure relief cover and the second pressure relief cover, respectively. A first spring is fixedly connected to one side of the first pressure relief cover, and one end of the first spring is fixedly connected to the inner wall of the first pressure relief groove. A sealing sleeve is provided on the outer side of the first spring, and both ends of the sealing sleeve are fixedly connected to the first pressure relief cover and the first pressure relief groove, respectively. This mechanism can automatically relieve pressure in the pipeline, thereby protecting the device.

[0009] Preferably, the first spring is located on the surface of the sliding link, and the sides of the first pressure relief cover and the second pressure relief cover that are far apart from each other are both arc surfaces that are adapted to the surface of the O-type ball valve. The arc surfaces of the first pressure relief cover and the second pressure relief cover can facilitate the rotation of the O-type ball valve inside the valve body and avoid affecting the rotation of the O-type ball valve.

[0010] Preferably, the protective mechanism includes a sliding sleeve, a limiting slide rod, a second spring, a first oil drain hole, a first oil drain plate, a first support rod, a second oil drain hole, a second oil drain plate, and a second support rod. A sliding sleeve is uniformly fixedly connected to one end of the first pressure relief groove. A limiting slide rod is slidably connected to one end of each sliding sleeve, and one end of each limiting slide rod is fixedly connected to one side of the first pressure relief cover. A second spring is fixedly connected to the other end of each limiting slide rod, and one end of each second spring is fixedly connected to the inner wall of the sliding sleeve. First oil drain holes are uniformly formed on the surface of the first pressure relief cover. One end of each oil drain hole is slidably connected to a first oil drain plate. A first support rod is uniformly fixedly connected to one side of each first oil drain plate, and one end of each first support rod is fixedly connected to the inner wall of the first pressure relief groove. A second oil drain hole is uniformly opened on the inner wall of the first pressure relief groove. A second oil drain plate is slidably connected inside each second oil drain hole. A second support rod is uniformly fixedly connected to one side of each second oil drain plate, and one end of each second support rod is fixedly connected to one side of the first pressure relief cover. This can further protect the device and thus further improve the safety of the device in use.

[0011] Preferably, the surface of the first oil drain plate away from the first pressure relief groove is an arc surface that matches the surface of the first pressure relief cover, which can ensure the normal rotation of the O-type ball valve and avoid affecting the rotation of the O-type ball valve.

[0012] Preferably, the surface of the second drain plate away from the first pressure relief cover is an arc surface that matches the inner wall of the O-type ball valve, ensuring that the petroleum liquid can pass through the O-type ball valve normally.

[0013] Preferably, the first drain hole and the second drain hole are interleaved, and the first drain plate and the second drain plate are also interleaved, which can ensure that the first pressure relief cover is subjected to uniform force, and that the petroleum liquid passes through the first drain hole and the second drain hole in a uniform and dispersed manner.

[0014] Equipped with a valve stem, worm gear, worm, and turntable, this device allows for easy opening and closing by the user. When the device is closed, the molten petroleum liquid impacts the O-type ball valve and the first pressure relief cover. This causes the first pressure relief cover to move the second pressure relief cover via a sliding connecting rod. The first and second springs are compressed, reducing some of the impact force. When the first drain plate is not inside the first drain hole, the second drain plate is not inside the second drain hole, and the second pressure relief cover is not inside the second pressure relief groove, some molten petroleum liquid passes between the first support rod and the first drain hole, then through the second drain hole and the second support rod, entering the O-type ball valve until it covers the pressure relief hole inside the O-type ball valve. The molten petroleum liquid then passes through the pressure relief hole and the second pressure relief groove, thus relieving pressure on the molten petroleum liquid, reducing the pressure inside the oil pipeline, and decreasing the impact and pressure on the device. This protects the device, preventing malfunctions in the entire fluid transport system, ensuring the normal operation of the production process, and reducing economic losses for the user. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0016] Figure 2 This is a three-dimensional cross-sectional view of the present invention;

[0017] Figure 3 This is a three-dimensional cross-sectional view of the O-type ball valve, the first pressure relief groove, and the second pressure relief groove in this utility model.

[0018] Figure 4 This is a three-dimensional cross-sectional view of the O-type ball valve and sealing sleeve in this utility model;

[0019] Figure 5 This is a three-dimensional cross-sectional view of the first and second oil drain holes in this utility model.

[0020] Figure 6 This is a three-dimensional schematic diagram of the limiting slide bar, the first oil drain plate, and the O-type ball valve in this utility model;

[0021] Figure 7 This is a three-dimensional schematic diagram of the first pressure relief cover, pressure relief hole, and first oil drain plate in this utility model;

[0022] Figure 8 This is a three-dimensional schematic diagram of the O-type ball valve, the second pressure relief cover, and the second oil drain plate in this utility model.

[0023] In the diagram: 1. Valve body; 2. Flange; 3. Fixed sealing cover; 4. Power transmission box; 5. O-type ball valve; 6. Fixed shaft; 7. Valve stem; 8. Worm gear; 9. Worm; 10. Turntable; 11. First pressure relief groove; 12. First pressure relief cover; 13. Second pressure relief groove; 14. Pressure relief hole; 15. Second pressure relief cover; 16. Sliding connecting rod; 17. First spring; 18. Sealing sleeve; 19. Sliding sleeve; 20. Limiting slide rod; 21. Second spring; 22. First oil drain hole; 23. First oil drain plate; 24. First support rod; 25. Second oil drain hole; 26. Second oil drain plate; 27. Second support rod. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figures 1-8 One embodiment provided by this utility model:

[0026] A corrosion-resistant valve for marine oil transportation pipelines includes a valve body 1 and a rotary self-locking mechanism that works in conjunction with the valve body 1. An O-type ball valve 5 is rotatably connected to the middle of the valve body 1. A first pressure relief groove 11 is provided on one side of the middle of the O-type ball valve 5. A first pressure relief cover 12 is slidably connected inside the first pressure relief groove 11. A rotary self-locking mechanism for opening and closing is provided at the top of the valve body 1. A pressure relief mechanism for pressure relief is provided inside the O-type ball valve 5. A protective mechanism for protecting the O-type ball valve 5 is provided inside the O-type ball valve 5.

[0027] Furthermore, the rotational self-locking mechanism includes a flange 2, a fixed sealing cover 3, a power transmission box 4, a fixed shaft 6, a valve stem 7, a worm gear 8, a worm 9, and a turntable 10. Both ends of the valve body 1 are fixedly connected to the flange 2. The top of the valve body 1 is fixedly connected to the fixed sealing cover 3. The top of the fixed sealing cover 3 is fixedly connected to the power transmission box 4. The bottom end of the O-type ball valve 5 is fixedly connected to the fixed shaft 6, which is rotatably connected to the inner wall of the bottom end of the valve body 1. The top of the O-type ball valve 5 is fixedly connected to the valve stem 7, and the top of the valve stem 7 passes through the fixed sealing cover 3 and is connected to the inner wall of the top of the power transmission box 4 via a bearing. The top of the valve stem 7 is fixedly connected to the worm gear 8. The power transmission box 4... The device is internally connected to a worm gear 9 via a bearing, with one end of the worm gear 9 extending to the outside of the power transmission box 4. The worm gear 9 meshes with the worm wheel 8, and one end of the worm gear 9 is fixedly connected to a turntable 10. The user installs the device on the oil pipeline via the flange 2. The user controls the delivery and shut-off of the oil liquid through this device. The user rotates the turntable 10, which drives the worm gear 9 to rotate. The worm gear 9 drives the worm wheel 8 to rotate, which in turn drives the O-type ball valve 5 to rotate inside the valve body 1 via the valve stem 7. This allows the user to easily control the delivery of the oil pipeline. The self-locking property of the worm wheel 8 and the worm gear 9 makes it easy for the user to open and close the device, while also enabling self-locking.

[0028] Furthermore, the protective mechanism includes a sliding sleeve 19, a limiting slide rod 20, a second spring 21, a first oil drain hole 22, a first oil drain plate 23, a first support rod 24, a second oil drain hole 25, a second oil drain plate 26, and a second support rod 27. A sliding sleeve 19 is uniformly fixedly connected to one end of the first pressure relief groove 11. A limiting slide rod 20 is slidably connected to one end of each sliding sleeve 19, and one end of each limiting slide rod 20 is fixedly connected to one side of the first pressure relief cover 12. A second spring 21 is fixedly connected to the other end of each limiting slide rod 20, and one end of each second spring 21 is connected to the sliding sleeve 19. The inner wall of the first pressure relief cover 12 is fixedly connected to the first oil drain hole 22, and the surface of the first pressure relief cover 12 is evenly provided with first oil drain holes 22. A first oil drain plate 23 is slidably connected to one end of each first oil drain hole 22. A first support rod 24 is evenly fixedly connected to one side of each first oil drain plate 23, and one end of each first support rod 24 is fixedly connected to the inner wall of the first pressure relief groove 11. A second oil drain hole 25 is evenly provided on the inner wall of the first pressure relief groove 11. A second oil drain plate 26 is slidably connected inside each second oil drain hole 25. A second support rod 27 is evenly fixedly connected to one side of each second oil drain plate 26. One end of each of the two support rods 27 is fixedly connected to one side of the first pressure relief cover 12. Under the effect of water hammer, the petroleum liquid will impact the O-type ball valve 5 and the first pressure relief cover 12, increasing the pressure inside the oil pipeline and the pressure on this device. At this time, under the action of pressure, the first pressure relief cover 12 moves into the interior of the first pressure relief groove 11. At this time, the second spring 21 is compressed, which can reduce part of the impact force. When the first oil drain plate 23 is not inside the first oil drain hole 22, the second oil drain plate 26 is not inside the second oil drain hole 25, and the second oil drain... When the gland 15 is not inside the second pressure relief groove 13, some petroleum liquid will enter the first pressure relief groove 11 through the first oil drain hole 22 and the first support rod 24, and then enter the O-type ball valve 5 through the second oil drain hole 25 and the second support rod 27 until the petroleum liquid submerges the pressure relief hole 14 inside the O-type ball valve 5. At this time, the petroleum liquid passes through the device through the pressure relief hole 14 and the second pressure relief groove 13, thereby relieving the pressure of the petroleum liquid, further protecting the device, and further improving the safety of the device.

[0029] Furthermore, the pressure relief mechanism includes a second pressure relief groove 13, a pressure relief hole 14, a second pressure relief cover 15, a sliding connecting rod 16, a first spring 17, and a sealing sleeve 18. A second pressure relief groove 13 is formed on the surface of the other side of the middle portion of the O-type ball valve 5. The second pressure relief cover 15 is slidably connected inside the second pressure relief groove 13. Pressure relief holes 14 are evenly distributed on the inner wall of the O-type ball valve 5, and one end of each pressure relief hole 14 is connected to the second pressure relief groove 13. A sliding connecting rod 16 is slidably connected to the middle portion of the O-type ball valve 5, and both ends of the sliding connecting rod 16 are fixedly connected to the first pressure relief cover 12 and the second pressure relief cover 15, respectively. A first spring 17 is fixedly connected to one side of the first pressure relief cover 12, and one end of the first spring 17 is fixedly connected to the inner wall of the first pressure relief groove 11. A sealing sleeve 18 is provided on the outer side of the first spring 17, and both ends of the sealing sleeve 18 are fixedly connected to the first pressure relief cover 12 and the first pressure relief groove 11, respectively. When the user turns the turntable 10 to close the device, the O-type ball valve 5 rotates 90 degrees, and one end of the first pressure relief cover 12 comes into contact with the petroleum liquid. Under the effect of water hammer, the petroleum liquid will impact the O-type ball valve 5 and the first pressure relief cover 12, increasing the pressure inside the petroleum pipeline and the pressure on the device. Under the action of the pressure, the first pressure relief cover 12 moves into the first pressure relief groove 11. The first pressure relief cover 12 drives the second pressure relief cover 15 to move through the sliding connecting rod 16, causing the second pressure relief cover 15 to move out of the second pressure relief groove 13. At this time, the first spring 17 is compressed, which can reduce some of the impact force. When the petroleum liquid passes through the pressure relief hole 14 inside the O-type ball valve 5, the petroleum liquid passes through the pressure relief hole 14 and the second pressure relief groove 13 through the device, which can automatically relieve the pressure in the pipeline, thereby protecting the device.

[0030] Furthermore, the first spring 17 is located on the surface of the sliding connecting rod 16. The sides of the first pressure relief cover 12 and the second pressure relief cover 15 that are away from each other are both arc surfaces adapted to the surface of the O-type ball valve 5. The arc surfaces of the first pressure relief cover 12 and the second pressure relief cover 15 facilitate the rotation of the O-type ball valve 5 inside the valve body 1, preventing the rotation of the O-type ball valve 5 from being affected. The surface of the first drain plate 23 on the side away from the first pressure relief groove 11 is also an arc surface adapted to the surface of the first pressure relief cover 12, ensuring the O-type ball valve... The normal rotation of valve 5 is ensured to avoid affecting the rotation of O-type ball valve 5. The surface of the second drain plate 26 away from the first pressure relief cover 12 is an arc surface that matches the inner wall of O-type ball valve 5, ensuring that the oil liquid passes through O-type ball valve 5 normally. The first drain hole 22 and the second drain hole 25 are distributed in a cross pattern, and the first drain plate 23 and the second drain plate 26 are also distributed in a cross pattern, which can ensure that the first pressure relief cover 12 is subjected to uniform force, and that the oil liquid passes through the first drain hole 22 and the second drain hole 25 evenly and dispersedly.

[0031] The user installs this device on the oil pipeline via flange 2. The user controls the delivery and shut-off of the oil liquid using this device. The user rotates turntable 10, which drives worm gear 9 to rotate. Worm gear 9 drives worm wheel 8 to rotate, which in turn drives O-type ball valve 5 to rotate inside valve body 1 via valve stem 7. This allows the user to easily control the delivery of oil in the pipeline. The self-locking property of worm wheel 8 and worm gear 9 allows the user to easily open the device to any position. When the user rotates turntable 10 to close the device, O-type ball valve 5 rotates 90 degrees, and one end of the first pressure relief cover 12 comes into contact with the oil liquid. Under the effect of water hammer, the oil liquid impacts O-type ball valve 5 and the first pressure relief cover 12, increasing the pressure inside the oil pipeline. This also increases the pressure on the device. Under this pressure, the first pressure relief cover 12 moves into the first pressure relief groove 11. The first pressure relief cover 12, via sliding connecting rod 16, drives the second pressure relief cover 15 to move out of the second pressure relief groove 13. When the first pressure relief cover 12 drives the limiting slide rod 20 to slide into the sliding sleeve 19, the first spring 17 and the second spring 21 are compressed, which can reduce some of the impact force. When the first oil drain plate 23 is not inside the first oil drain hole 22, the second oil drain plate 26 is not inside the second oil drain hole 25, and the second pressure relief cover 15 is not inside the second pressure relief groove 13, some petroleum liquid will enter the first pressure relief groove 11 through the first oil drain hole 22 and the first support rod 24, and then enter the O-type ball valve 5 through the second oil drain hole 25 and the second support rod 27 until the petroleum liquid submerges the pressure relief hole 14 inside the O-type ball valve 5. At this time, the petroleum liquid passes through the device through the pressure relief hole 14 and the second pressure relief groove 13, thereby relieving the pressure of the petroleum liquid, reducing the pressure inside the oil pipeline, reducing the impact force and pressure on the device, and thus protecting the device. This can prevent the failure of the entire fluid transportation system, ensure the normal operation of the production process, and reduce the economic losses caused to users.

[0032] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A corrosion-resistant valve for marine oil transportation pipelines, comprising a valve body (1) and a rotational self-locking mechanism cooperating with the valve body (1), characterized in that, The valve body (1) is rotatably connected to an O-type ball valve (5) in the middle. A first pressure relief groove (11) is provided on one side of the middle of the O-type ball valve (5). A first pressure relief cover (12) is slidably connected inside the first pressure relief groove (11). A rotational self-locking mechanism for opening and closing is provided at the top of the valve body (1). A pressure relief mechanism for pressure relief is provided inside the O-type ball valve (5). A protective mechanism for protecting the O-type ball valve (5) is provided inside the O-type ball valve (5).

2. A corrosion-resistant valve for marine oil transportation pipelines according to claim 1, characterized in that: The rotating self-locking mechanism includes a flange (2), a fixed sealing cover (3), a power transmission box (4), a fixed shaft (6), a valve stem (7), a worm gear (8), a worm (9), and a turntable (10). Both ends of the valve body (1) are fixedly connected to the flange (2). The top of the valve body (1) is fixedly connected to the fixed sealing cover (3). The top of the fixed sealing cover (3) is fixedly connected to the power transmission box (4). The bottom end of the O-type ball valve (5) is fixedly connected to the fixed shaft (6), and the fixed shaft (6) is connected to the bottom end of the valve body (1). The inner wall is rotatably connected. The top of the O-type ball valve (5) is fixedly connected to the valve stem (7), and the top of the valve stem (7) passes through the fixed sealing cover (3) and is connected to the inner wall of the top of the power transmission box (4) through the bearing. The top of the valve stem (7) is fixedly connected to the worm wheel (8). The inside of the power transmission box (4) is connected to the worm (9) through the bearing, and one end of the worm (9) extends to the outside of the power transmission box (4). The worm (9) meshes with the worm wheel (8), and one end of the worm (9) is fixedly connected to the turntable (10).

3. A corrosion-resistant valve for marine oil transportation pipelines according to claim 1, characterized in that: The pressure relief mechanism includes a second pressure relief groove (13), a pressure relief hole (14), a second pressure relief cover (15), a sliding connecting rod (16), a first spring (17), and a sealing sleeve (18). A second pressure relief groove (13) is provided on the surface of the other side of the middle portion of the O-type ball valve (5). A second pressure relief cover (15) is slidably connected inside the second pressure relief groove (13). Pressure relief holes (14) are evenly distributed on the inner wall of the O-type ball valve (5), and one end of each pressure relief hole (14) is connected to the second pressure relief groove (13). 5) has a sliding connecting rod (16) in the middle, and both ends of the sliding connecting rod (16) are fixedly connected to the first pressure relief cover (12) and the second pressure relief cover (15) respectively. A first spring (17) is fixedly connected to one side of the first pressure relief cover (12), and one end of the first spring (17) is fixedly connected to the inner wall of the first pressure relief groove (11). A sealing sleeve (18) is provided on the outside of the first spring (17), and both ends of the sealing sleeve (18) are fixedly connected to the first pressure relief cover (12) and the first pressure relief groove (11) respectively.

4. A corrosion-resistant valve for marine oil transportation pipelines according to claim 3, characterized in that: The first spring (17) is located on the surface of the sliding link (16), and the first pressure relief cover (12) and the second pressure relief cover (15) are both arc surfaces that are compatible with the surface of the O-type ball valve (5) on the side that is far away from each other.

5. A corrosion-resistant valve for marine oil transportation pipelines according to claim 1, characterized in that: The protective mechanism includes a sliding sleeve (19), a limiting slide rod (20), a second spring (21), a first oil drain hole (22), a first oil drain plate (23), a first support rod (24), a second oil drain hole (25), a second oil drain plate (26), and a second support rod (27). A sliding sleeve (19) is uniformly fixedly connected to one end of the first pressure relief groove (11). A limiting slide rod (20) is slidably connected to one end of each sliding sleeve (19), and one end of each limiting slide rod (20) is fixedly connected to one side of the first pressure relief cover (12). A second spring (21) is fixedly connected to the other end of each limiting slide rod (20), and one end of each second spring (21) is fixedly connected to the inner wall of the sliding sleeve (19). The surface of the pressure cap (12) is uniformly provided with first oil drain holes (22). One end of each first oil drain hole (22) is slidably connected to a first oil drain plate (23). One side of each first oil drain plate (23) is uniformly fixedly connected to a first support rod (24). One end of each first support rod (24) is fixedly connected to the inner wall of the first pressure relief groove (11). The inner wall of the first pressure relief groove (11) is uniformly provided with second oil drain holes (25). The inside of each second oil drain hole (25) is slidably connected to a second oil drain plate (26). One side of each second oil drain plate (26) is uniformly fixedly connected to a second support rod (27). One end of each second support rod (27) is fixedly connected to one side of the first pressure relief cap (12).

6. A corrosion-resistant valve for marine oil transportation pipelines according to claim 5, characterized in that: The surface of the first oil drain plate (23) away from the first pressure relief groove (11) is an arc surface that matches the surface of the first pressure relief cover (12).

7. A corrosion-resistant valve for marine oil transportation pipelines according to claim 5, characterized in that: The surface of the second drain plate (26) away from the first pressure relief cover (12) is an arc surface that is adapted to the inner wall of the O-type ball valve (5).

8. A corrosion-resistant valve for marine oil transportation pipelines according to claim 5, characterized in that: The first oil drain hole (22) and the second oil drain hole (25) are intersected, and the first oil drain plate (23) and the second oil drain plate (26) are also intersected.

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