High pressure self-sealing forged steel globe valve

Abstract

The application relates to the technical field of forged steel stop valves, in particular to a high-pressure self-sealing forged steel stop valve, which is characterized in that a threaded rod is rotatably arranged in the upper shell and the lower shell, an upper sliding plate and a lower sliding plate are threadedly installed on the threaded rod, an upper connecting column is fixedly installed at the bottom of the upper sliding plate, and a lower connecting column is fixedly installed at the top of the lower sliding plate; a first circular ring is arranged at the bottom of the upper connecting column, a circular groove matched with the first circular ring is arranged at the top of the lower connecting column, and an L-shaped circular hole is arranged in the circular groove; a through hole is arranged at the top of the lower shell and is communicated with one side of an outlet pipe of the lower shell; through the cooperation of the upper and lower connecting columns and the L-shaped flow guide hole in the opposite movement, the self-cleaning of a sealing surface and the automatic discharge of residual medium are realized, the sealing failure caused by the residual medium under high-pressure working conditions is effectively avoided, and the sealing reliability and the service life of the valve are improved.

Description

Technical Field

[0001] This application relates to the technical field of forged steel gate valves, and in particular to a high-pressure self-sealing forged steel gate valve. Background Technology

[0002] A forged steel globe valve is a shut-off valve that opens and closes by moving a valve disc along the centerline of the valve seat. The change in the valve seat opening is directly proportional to the valve disc stroke. Pressure ratings range from ANSI Class 150LB to 2500LB, and nominal diameters range from DN10 to 500 (NPS 1 / 2 to 36). This valve offers various connection methods including flange, butt welding, threaded, and socket welding. The bonnet design includes bolted, welded, and pressure-self-tightening types. Its sealing surface utilizes Stellite cobalt-based hard alloy overlay welding, featuring reliable shut-off and low wear. It is suitable for water, steam, oil, and corrosive media, with an operating temperature range of -29℃ to 550℃. Valve body materials include various forged steels such as A105 and F304. Actuation methods include manual, pneumatic, and electric operation. Installation requires a strength test of 1.5 times the nominal pressure and a tightness test of 1.1 times the nominal pressure. Maintenance must be performed with the valve closed to ensure proper lubrication. It is widely used in petrochemical, power, urban heating and other fields, and is especially suitable for pipeline media control under high temperature and high pressure conditions.

[0003] In existing forged steel gate valves, media or impurities can easily remain between the sealing surfaces during the valve closing process. Especially under high pressure, the residue may be squeezed and cause wear, corrosion or blockage of the sealing surfaces, affecting the sealing effect, or even causing valve leakage and shortening the service life. Utility Model Content

[0004] To address the problems mentioned in the background section, this application provides a high-pressure self-sealing forged steel gate valve.

[0005] This application provides a high-pressure self-sealing forged steel gate valve, which adopts the following technical solution: it includes an upper shell and a lower shell, and a threaded rod is rotatably arranged inside the upper shell and the lower shell. An upper sliding plate and a lower sliding plate are threadedly installed on the threaded rod. An upper connecting column is fixedly installed at the bottom of the upper sliding plate, and a lower connecting column is fixedly installed at the top of the lower sliding plate.

[0006] The bottom of the upper connecting column is provided with a first ring, and the top of the lower connecting column is provided with a circular groove that matches the first ring. An L-shaped circular hole is provided inside the circular groove.

[0007] The top of the lower shell has a through hole, which is connected to the outlet pipe side of the lower shell.

[0008] Optionally, the upper and lower shells are cylindrical, and a semi-circular groove is provided on the inner side of the bottom of the upper shell, with the semi-circular groove located on the outlet side.

[0009] Optionally, the threaded rod is rotatably disposed within the side walls of the upper and lower shells.

[0010] Optionally, the sliding plate consists of a disc and a slider, and the upper and lower shells have grooves inside that cooperate with the slider.

[0011] Optionally, a second ring is provided on the lower connecting post.

[0012] Optionally, the through hole is only provided on the outlet side.

[0013] In summary, this application includes the following beneficial technical effects:

[0014] This invention achieves self-cleaning of the sealing surface and automatic discharge of residual media by cooperating with the upper and lower connecting columns moving in opposite directions and the L-shaped guide channel. This effectively avoids the sealing failure caused by residual media under high pressure conditions, and improves the sealing reliability and service life of the valve.

[0015] This utility model features a structure that drives the upper and lower sliding plates to move synchronously through a bidirectional threaded rod. It can achieve rapid opening and closing and multiple sealing without external power or control system. It has a compact structure, is easy to operate, and is suitable for automatic flow control in high temperature and high pressure environments. It has good engineering applicability and safety. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the front in an embodiment of this application;

[0017] Figure 2 This is a schematic diagram of the lower connecting column structure in an embodiment of this application;

[0018] Figure 3 This is a schematic diagram of the threaded rod structure in an embodiment of this application;

[0019] Figure 4 This is a schematic diagram of the lower shell structure in an embodiment of this application.

[0020] Reference numerals: 11. Upper shell; 12. Lower shell; 13. Threaded rod; 14. Upper sliding plate; 15. Lower sliding plate; 16. Upper connecting post; 17. Lower connecting post; 18. First ring; 19. Circular groove; 21. L-shaped circular hole; 22. Semi-arc groove; 23. Second ring; 24. Through hole. Detailed Implementation

[0021] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0022] This application discloses a high-pressure self-sealing forged steel gate valve. For example... Figures 1 to 4As shown, a high-pressure self-sealing forged steel gate valve includes an upper shell 11 and a lower shell 12. When the valve needs to be closed, the threaded rod 13 installed inside the upper shell 11 and the lower shell 12 is rotated. The threaded rod 13 causes the sliding plates installed inside the upper shell 11 and the lower shell 12 to gradually converge towards the center. The sliding plate inside the upper shell 11 will drive the upper connecting column 16 to move from top to bottom, and the sliding plate inside the lower shell 12 will drive the lower connecting column 17 to move from bottom to top. The first ring 18 on the upper connecting column 16 will gradually insert into the circular groove 19 of the lower connecting column 17, and the second ring 23 installed on the lower connecting column 17 will also gradually approach the side wall of the second ring 23. When the bottom of the upper connecting column 16 and the top of the lower connecting column 17 are in contact, a sealed space will be formed. At this time, the interiors of the upper shell 11 and the lower shell 12 will be filled by the upper connecting column 16 and the lower connecting column 17, respectively.

[0023] Both the upper shell 11 and the lower shell 12 are cylindrical with hollow interiors. The hollow part is a cylinder, and a semi-circular groove 22 is provided on the inner side of the bottom of the upper shell 11. The semi-circular groove 22 is located on the outlet tube side.

[0024] The threaded rod 13 is rotatably disposed inside the lower shell 12. The threaded rod 13 is inserted inside the lower shell 12. Similar to the upper shell 11, it is rotated by the bearing on the side wall. The bearing has a matching thread inside, so there will be no leakage. The threaded rod 13 is rotatably disposed inside the upper connecting post 16 and the lower connecting post 17.

[0025] The sliding plate consists of a disc and a slider. The slider is located on both sides of the disc, and corresponding grooves are provided inside the upper shell 11 and the lower shell 12, so that the sliding plate can only move up and down and cannot rotate.

[0026] When the first ring 18 at the bottom of the upper connecting column 16 is inserted into the groove 19 of the lower connecting column 17, the material being transported inside will enter the groove 19 during use. Therefore, when the first ring 18 is inserted into the groove 19, the material inside will be discharged through the L-shaped hole 21 inside the groove 19 and directly discharged into the lower shell 12. The top of the lower shell 12 is also provided with a through hole 24. As the sliding plate 15 moves upward, the material inside will gradually be discharged from the through hole 24 into the outlet pipe, thus realizing the self-sealing function of the device.

[0027] The through hole 24 is only provided on the outlet side, while the inlet side is sealed. When the upper shell 11 and the lower shell 12 are closed, the through hole 24 will not be blocked, and material can continue to be discharged outward.

[0028] Working principle: The operator rotates the threaded rod 13, which runs vertically through the center of the valve body. This threaded rod 13 is confined within the valve body by two sets of precision bearings. Because the upper half of the threaded rod 13 is right-handed and the lower half is left-handed, forming opposite helical pairs with the threaded sleeves inside the upper and lower sliding plates 15, rotation synchronously drives the upper and lower sliding plates to move towards each other along the axial grooves on the inner wall of the valve body. The upper sliding plate 14 drives the upper connecting column 16 downwards, while the lower sliding plate 15 pushes the lower connecting column 17 upwards.

[0029] In the initial stage of the closed stroke, the flow channel remains open, and the medium flows normally. As the connecting column continues to move, when the annular groove at the top of the lower connecting column 17 begins to receive the first sealing ring at the bottom of the upper connecting column 16, the precisely fitted ring and groove begin to form the first annular labyrinth seal, significantly reducing the channel for medium leakage. As the connecting columns continue to move closer, their end faces gradually approach each other. At this point, the residual medium trapped between the end faces of the two connecting columns is compressed, and the pressure increases. This compressed medium flows through a specially designed L-shaped guide channel inside the lower connecting column 17—one end of which opens at the bottom or side wall of the annular groove, and the other end leads to the inner cavity of the lower shell 12.

[0030] Subsequently, the medium discharged into the lower shell 12 cavity flows naturally under pressure to the radial through-hole 24 located at the top of the lower shell 12 and near the outlet pipe. Since this through-hole 24 is directly connected to the outlet flow area of ​​the valve and the feed side is a completely closed structure, the removed medium flows smoothly back into the outlet pipe and merges with the main flow medium, thus achieving self-cleaning of the sealing surface. When the hardened end faces of the upper and lower connecting columns 17 finally make metal-to-metal hard contact, all residual medium has been completely eliminated, and the main flow channel is completely mechanically cut off. At this time, the tight fit between the first sealing ring and the annular groove forms a reliable secondary seal, while any gaps that may exist between the connecting column body and the valve body cavity are statically sealed by the sealing elements (such as O-rings or graphite rings) on the sliding plate, thus ultimately forming a multi-seal system that maintains zero leakage even under high pressure. The entire process of closing, slag discharge, and sealing is completed internally by the valve's mechanical structure, without relying on external power or control systems, achieving a highly efficient and reliable self-sealing function.

[0031] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-pressure self-sealing forged steel gate valve, comprising an upper shell (11) and a lower shell (12), characterized in that: The upper shell (11) and lower shell (12) are rotatably provided with threaded rods (13), and upper sliding plate (14) and lower sliding plate (15) are threaded on the threaded rod (13). The upper sliding plate (14) is fixedly installed with an upper connecting column (16) at the bottom, and the lower sliding plate (15) is fixedly installed with a lower connecting column (17) at the top. The bottom of the upper connecting post (16) is provided with a first ring (18), and the top of the lower connecting post (17) is provided with a circular groove (19) that matches the first ring (18). The inside of the circular groove (19) is provided with an L-shaped circular hole (21). The top of the lower shell (12) is provided with a through hole (24), which is connected to the outlet pipe side of the lower shell (12).

2. The high-pressure self-sealing forged steel gate valve according to claim 1, characterized in that: The upper shell (11) and the lower shell (12) are cylindrical. A semi-circular groove (22) is provided on the inner side of the bottom of the upper shell (11), and the semi-circular groove (22) is located on the outlet side.

3. The high-pressure self-sealing forged steel gate valve according to claim 1, characterized in that: The threaded rod (13) is rotatably disposed within the side walls of the upper shell (11) and the lower shell (12).

4. The high-pressure self-sealing forged steel gate valve according to claim 1, characterized in that: The sliding plate consists of a disc and a slider, and the upper shell (11) and the lower shell (12) are provided with grooves that cooperate with the slider.

5. A high-pressure self-sealing forged steel gate valve according to claim 1, characterized in that: A second ring (23) is provided on the lower connecting post (17).

6. A high-pressure self-sealing forged steel gate valve according to claim 1, characterized in that: The through hole (24) is only provided on the outlet side.

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