A type of ultra-high pressure shut-off valve

Abstract

This utility model relates to the field of valve technology, and more particularly to an ultra-high pressure shut-off valve. The utility model includes a test flange and a valve body. A connecting pipe is mounted on the top of the test flange, a lens gasket is mounted between the test flange and the connecting pipe, a valve seat sleeve is mounted above the connecting pipe, a guide bushing is mounted on the inner side of the valve body, a valve stem is slidably connected to the inner side of the guide bushing, and a packing sleeve is fixed to the inner side of the valve body. A packing assembly is located at the bottom end of the packing sleeve. This utility model provides an ultra-high pressure shut-off valve that uses a hydraulic cylinder as a power source to generate a thrust of 630 kN under 16 MPa hydraulic pressure, which is transmitted to the gland nut through a connecting disc and an elastic pin. The gland nut is connected to the guide bushing via a bracket, forming a rigid transmission chain that drives the valve stem to move linearly. This design utilizes the constant force characteristics of the hydraulic system to ensure stable opening and closing of the valve stem under high-pressure fluid conditions.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to an ultra-high pressure shut-off valve. Background Technology

[0002] In fields such as ultra-high voltage power transmission and high-pressure chemical fluid transportation, gate valves are key devices for controlling the flow of fluids.

[0003] When using the above technology, the following technical problems were found in the existing technology: At present, the shut-off valves used in high-pressure fluid control systems generally have problems such as insufficient sealing performance and limited structural strength. Especially in the 0MPa level ultra-high pressure environment of the connection plate, the valve seat, valve core and connecting parts of traditional valves are prone to deformation, leakage or even failure, resulting in reduced system safety and reliability.

[0004] In the existing technology, the sealing structure and pressure-bearing component design of valves are difficult to meet the long-term stable operation requirements under ultra-high pressure conditions. Therefore, there is an urgent need to develop an ultra-high pressure shut-off valve with high strength and high sealing performance. To this end, we have designed an ultra-high pressure shut-off valve to provide another technical solution to the above-mentioned technical problems. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] An ultra-high pressure shut-off valve includes a test flange and a valve body. A connecting pipe is fitted to the top of the test flange, and a lens gasket is fitted between the test flange and the connecting pipe. A valve seat sleeve is fitted above the connecting pipe. A guide bushing is fitted inside the valve body, and a valve stem is slidably connected to the inner side of the guide bushing. A packing sleeve is fixed inside the valve body, and a packing assembly is provided at the bottom of the packing sleeve. The bottom of the packing sleeve is connected to the valve body via a cylindrical pin. A gland nut is fitted to the top of the packing sleeve, and a bracket is fitted to the outer side of the packing sleeve. The guide bushing and the bracket are connected via an internal hexagonal set screw A, and the bracket is connected to the gland nut via a resilient pin.

[0007] In a preferred embodiment of the ultra-high pressure shut-off valve provided by this utility model, a hexagonal head bolt is connected to the outside of the valve body, a gland flange is fitted to the outside of the connecting pipe, and a metal hollow O-ring A, a valve seat sleeve, and a valve seat A are fitted between the gland flange and the valve body.

[0008] In a preferred embodiment of the ultra-high pressure shut-off valve provided by this utility model, a threaded flange is fitted at the bottom of the outer side of the connecting pipe, a fully threaded stud A is fitted between the test flange and the threaded flange, and the top of the connecting pipe is assembled with the valve body through a fully threaded stud B and a gland flange.

[0009] In a preferred embodiment of the ultra-high pressure shut-off valve provided by this utility model, an internally threaded round pin is fitted at the top of the bracket, a connecting plate is fixed at the top of the bracket, an external oil cylinder is fitted at the top of the connecting plate, and the connecting plate and the external oil cylinder are connected by a hexagonal nut B.

[0010] In a preferred embodiment of the ultra-high pressure shut-off valve provided by this utility model, an internal hexagonal set screw B is fitted on the inner side of one of the connecting discs, and one end of the internal hexagonal set screw B is connected to the bracket.

[0011] In a preferred embodiment of the ultra-high pressure shut-off valve provided by this utility model, the bracket includes a shaft retaining ring, a retaining ring, a washer A, a spherical washer, a ball sleeve, a ball top, a connecting sleeve, a ball cap, a washer B, and a locking nut. The top of the valve stem is provided with a shaft retaining ring, a retaining ring, a washer A, a spherical washer, a ball sleeve, a ball top, a connecting sleeve, a ball cap, a washer B, and a locking nut between the top of the valve stem and the external oil cylinder.

[0012] In a preferred embodiment of the ultra-high pressure shut-off valve provided by this utility model, a connecting sleeve is slidably connected to the top of the valve stem, the bottom end of the connecting sleeve is connected to a retaining ring, the bottom end of the connecting sleeve is connected to a bracket by a retaining ring, a washer A, a spherical washer, a ball sleeve, a ball cap and a washer B are assembled on the inner side of the connecting sleeve, and a locking nut is assembled on the top of the connecting sleeve.

[0013] It is clear without a doubt that the technical solution described above in this application can solve the technical problem that this application aims to address.

[0014] At the same time, through the above technical solutions, this utility model has at least the following beneficial effects:

[0015] This utility model provides an ultra-high pressure shut-off valve that, through static sealing components such as lens gaskets and hollow metal O-rings A, combined with dynamic sealing designs of packing assemblies and spherical sealing assemblies (ball sleeves, ball tops, etc.), forms a multi-protection system of "flange sealing, valve stem sealing, and transmission component sealing," which can withstand ultra-high pressure fluid pressure of 350MPa and significantly improves sealing reliability.

[0016] Fluid pressure is uniformly transmitted through the closed path of valve seat, packing sleeve, valve body and flange, and driving load is transmitted through the rigid transmission chain of cylinder, connecting plate, bracket and valve stem, avoiding local stress concentration and enhancing the overall structural strength.

[0017] The hydraulic cylinder provides a constant thrust of 630KN, and the valve stem is opened and closed smoothly through the hydraulic system. This overcomes the problems of high opening and closing resistance and lag in traditional mechanical drives under high pressure, and improves control accuracy. The precise design of 22mm stroke ensures that the valve stem opens and closes in place, avoiding sealing failure or fluid throttling loss due to stroke error. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the internal structure of the bracket of this utility model;

[0021] Figure 3 This is a schematic diagram of the structure between the guide bushing and the bracket of this utility model;

[0022] Figure 4 This is a schematic diagram of the internal structure of the valve body of this utility model.

[0023] In the diagram: 1. Test flange; 2. Lens gasket; 3. Threaded flange; 4. Fully threaded stud A; 5. Hex head bolt; 6. Connecting pipe; 7. Fully threaded stud B; 8. Hex nut B; 9. Gland flange; 10. Hollow metal O-ring A; 11. Valve seat sleeve; 12. Valve seat A; 13. Valve body; 14. Guide bushing; 15. Valve stem; 16. Packing assembly; 17. Cylindrical pin; 18. Packing sleeve; 19. Gland nut; 20. Socket head cap set screw A; 21. Elastic pin; 22. Shaft retaining ring; 23. Snap ring; 24. Washer A; 25. Spherical washer; 26. Ball sleeve; 27. Ball top; 28. Connecting sleeve; 29. ​​Ball cap; 30. Washer B; 31. Lock nut; 32. Internally threaded round pin; 33. Socket head cap set screw B; 34. Bracket; 35. Connecting plate. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0025] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0026] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] Example 1: Please refer to Figures 1-4 A high-pressure shut-off valve includes a test flange 1 and a valve body 13. A connecting pipe 6 is mounted on the top of the test flange 1, and a lens gasket 2 is mounted between the test flange 1 and the connecting pipe 6. A valve seat sleeve 11 is mounted above the connecting pipe 6. A guide bushing 14 is mounted on the inner side of the valve body 13. A valve stem 15 is slidably connected to the inner side of the guide bushing 14. A packing sleeve 18 is fixed on the inner side of the valve body 13. A packing assembly 16 is provided at the bottom of the packing sleeve 18. The bottom of the packing sleeve 18 is connected to the valve body 13 through a cylindrical pin 17. A gland nut 19 is mounted on the top of the packing sleeve 18. A bracket 34 is mounted on the outer side of the packing sleeve 18. The guide bushing 14 and the bracket 34 are connected by an internal hexagon set screw A20. The bracket 34 is connected to the gland nut 19 through an elastic pin 21.

[0029] The test flange 1 and the connecting pipe 6 are sealed with a lens gasket 2. The lens gasket 2 is plastically deformed by the preload of the fully threaded stud A4, filling the gap between the contact surfaces.

[0030] A hollow metal O-ring A10 is installed between the gland flange 9 and the valve body 13. Its elastic deformation is used to compensate for small displacements under high pressure, and the sealing pressure can reach 350MPa.

[0031] The packing assembly 16 inside the packing sleeve 18 is composed of multiple layers of flexible materials such as metal spiral wound gaskets. Under the axial pressure of the gland nut 19, it forms an annular sealing band along the outer periphery of the valve stem 15 to prevent fluid leakage along the axis of the valve stem 15.

[0032] The packing sleeve 18 is fixed to the valve body 13 by the cylindrical pin 17, and the gland nut 19 is linked to the bracket by the elastic pin 21 to ensure that the packing assembly 16 is always in a pre-tight state under high pressure.

[0033] A hexagonal head bolt 5 is connected to the outside of the valve body 13, and a gland flange 9 is assembled on the outside of the connecting pipe 6. A metal hollow O-ring A10, a valve seat sleeve 11, and a valve seat A12 are assembled between the gland flange 9 and the valve body 13.

[0034] A threaded flange 3 is fitted at the bottom of the outer side of the connecting pipe 6. A fully threaded stud A4 is fitted between the test flange 1 and the threaded flange 3. The top of the connecting pipe 6 is assembled with the valve body 13 through a fully threaded stud B7 and a gland flange 9.

[0035] The top of the bracket 34 is fitted with an internally threaded pin 32. The top of the bracket 34 is fixed with a connecting plate 35. The top of the connecting plate 35 is fitted with an external hydraulic cylinder. The connecting plate 35 and the external hydraulic cylinder are connected by a hexagonal nut B8.

[0036] The hydraulic system supplies oil, and the external oil cylinder pushes the connecting plate 35, which drives the pressure cap nut 19 to move upward through the elastic pin 21. The valve stem 15 rises accordingly, and the fluid flows through the valve seat sleeve 11 channel. The pressure system is depressurized, and the valve stem 15 moves downward under the action of fluid pressure, tightly fitting with the valve seat A12 and cutting off the fluid passage.

[0037] One of the connecting discs 35 has an internal hexagon set screw B33 mounted on its inner side, and one end of the internal hexagon set screw B33 is connected to the bracket 34.

[0038] The bracket 34 includes a shaft retaining ring 22, a retaining ring 23, a washer A24, a spherical washer 25, a ball sleeve 26, a ball top 27, a connecting sleeve 28, a ball cap 29, a washer B30, and a locking nut 31. The top of the valve stem 15 is provided with a shaft retaining ring 22, a retaining ring 23, a washer A24, a spherical washer 25, a ball sleeve 26, a ball top 27, a connecting sleeve 28, a ball cap 29, a washer B30, and a locking nut 31 between the top of the valve stem 15 and the external oil cylinder.

[0039] The inner side of the connecting sleeve 28 at the top of the valve stem 15 is fitted with a ball sleeve 26, a ball top 27, and a spherical washer 25, forming a spherical contact pair. The elastic force of the spherical washer 25 ensures that the ball sleeve 26 fits tightly against the valve stem 15, allowing for slight deflection of the valve stem 15 and accommodating deformation errors under high pressure.

[0040] The retaining ring 22 and the retaining ring 23 restrict the axial displacement of the connecting sleeve 28 to ensure that the spherical sealing surface is always subjected to uniform pressure.

[0041] A connecting sleeve 28 is slidably connected to the top of the valve stem 15. The bottom end of the connecting sleeve 28 is connected to the retaining ring 23. The bottom end of the connecting sleeve 28 is connected to the bracket 34 by a retaining ring 22. The inner side of the connecting sleeve 28 is equipped with a washer A24, a spherical washer 25, a ball sleeve 26, a ball cap 29, and a washer B30. The top of the connecting sleeve 28 is equipped with a locking nut 31.

[0042] Fully threaded studs such as M48×215 and M52×370 use A193B16 high-strength material and are paired with GB / T93 elastic washers. The combined seal is formed by the bolt preload and the washer rebound force to prevent leakage in the thread gap.

[0043] The operation of the ultra-high pressure shut-off valve provided by this utility model is as follows: The hydraulic cylinder acts as a power source, generating a thrust of 630KN under 16MPa hydraulic pressure. This thrust is transmitted to the connecting plate 35 via the hexagonal nut B8 between the connecting plate 35 and the external hydraulic cylinder. The connecting plate 35 is connected to the bracket 34 via an elastic pin 21, and the bracket is then fixed to the guide bushing 14 via an internal hexagonal set screw A20. When the piston of the external hydraulic cylinder moves, the power sequentially passes through the connecting plate 35, the elastic pin 21, the bracket, and the guide bushing 14, ultimately driving the valve stem 15 to slide axially.

[0044] The hydraulic cylinder thrusts the valve stem 15 upward. The connecting sleeve 28 at the top of the valve stem 15 is linked with the bracket 34 through the retaining ring 23 and the shaft retaining ring 22, which separates the valve stem 15 from the valve seat 16 and opens the fluid passage. After the hydraulic cylinder is depressurized, the valve stem 15 moves downward under the action of the fluid pressure of 350MPa. The ball top 27 and ball sleeve 26 at the top of the valve stem 15 fit tightly with the valve seat 16, blocking the fluid passage. The locking nut 31 provides preload through the washer B30 to ensure that the sealing surface pressure is greater than the fluid pressure.

[0045] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the present utility model to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An ultra-high pressure shut-off valve, characterized in that, The test flange (1) and valve body (13) are included. A connecting pipe (6) is installed at the top of the test flange (1). A lens gasket (2) is installed between the test flange (1) and the connecting pipe (6). A valve seat sleeve (11) is installed above the connecting pipe (6). A guide bushing (14) is installed on the inner side of the valve body (13). A valve stem (15) is slidably connected to the inner side of the guide bushing (14). A packing sleeve (18) is fixed on the inner side of the valve body (13). The bottom of the sleeve (18) is provided with a packing assembly (16). The bottom of the packing sleeve (18) is connected to the valve body (13) by a cylindrical pin (17). The top of the packing sleeve (18) is equipped with a gland nut (19). The outside of the packing sleeve (18) is equipped with a bracket (34). The guide bushing (14) and the bracket (34) are connected by an internal hexagon set screw A (20). The bracket (34) is connected to the gland nut (19) by an elastic pin (21).

2. The ultra-high pressure shut-off valve according to claim 1, characterized in that, The valve body (13) is connected to a hexagonal head bolt (5) on the outside, and a gland flange (9) is fitted on the outside of the connecting pipe (6). A metal hollow O-ring A (10), a valve seat sleeve (11) and a valve seat A (12) are fitted between the gland flange (9) and the valve body (13).

3. The ultra-high pressure shut-off valve according to claim 2, characterized in that, The bottom of the outer side of the connecting pipe (6) is fitted with a threaded flange (3), and a fully threaded stud A (4) is fitted between the test flange (1) and the threaded flange (3). The top of the connecting pipe (6) is assembled with the valve body (13) through a fully threaded stud B (7) and a gland flange (9).

4. The ultra-high pressure shut-off valve according to claim 2, characterized in that, The top of the bracket (34) is fitted with an internal threaded pin (32), and the top of the bracket (34) is fixed with a connecting plate (35). The top of the connecting plate (35) is fitted with an external oil cylinder, and the connecting plate (35) and the external oil cylinder are connected by a hexagonal nut B (8).

5. A high-pressure shut-off valve according to claim 4, characterized in that, One of the connecting discs (35) is fitted with an internal hexagon set screw B (33) on its inner side, one end of which is connected to the bracket (34).

6. A high-pressure shut-off valve according to claim 2, characterized in that, The bracket (34) includes a shaft retaining ring (22), a retaining ring (23), a washer A (24), a spherical washer (25), a ball sleeve (26), a ball top (27), a connecting sleeve (28), a ball cap (29), a washer B (30), and a locking nut (31). The top of the valve stem (15) is provided with a shaft retaining ring (22), a retaining ring (23), a washer A (24), a spherical washer (25), a ball sleeve (26), a ball top (27), a connecting sleeve (28), a ball cap (29), a washer B (30), and a locking nut (31) between the top of the valve stem (15) and the external cylinder.

7. A high-pressure shut-off valve according to claim 6, characterized in that, The valve stem (15) is slidably connected to a connecting sleeve (28). The bottom end of the connecting sleeve (28) is connected to a retaining ring (23). The bottom end of the connecting sleeve (28) is connected to a bracket (34) with a retaining ring (22) on the rear shaft. The inner side of the connecting sleeve (28) is equipped with a washer A (24), a spherical washer (25), a ball sleeve (26), a ball cap (29), and a washer B (30). The top end of the connecting sleeve (28) is equipped with a locking nut (31).

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