Dual anti-rotation bellows regulator valve

Abstract

This utility model relates to a bellows regulating valve with double anti-rotation protection. The upper end of the bellows is welded to a flange plate, and the lower end is welded to an adapter. A first guide sleeve is provided on the upper side of the flange plate. The upper side of the adapter has a first threaded hole for threaded connection of the lower end of the valve stem. The valve stem has an anti-rotation guide part, and the first guide sleeve has an anti-rotation guide hole. The anti-rotation guide part is disposed within the anti-rotation guide hole. The lower end of the adapter is threadedly connected to an extension rod, and the lower end of the extension rod is threadedly connected to the valve core. A second guide sleeve is fitted outside the extension rod. The inner hole of the second guide sleeve has an anti-rotation axial groove, and the side wall of the extension rod has an anti-rotation guide protrusion disposed within the anti-rotation axial groove. The first and second anti-rotation protection structures work together to form a double anti-rotation protection structure, preventing bellows breakage. The double anti-rotation protection complements each other and also avoids the problem of easy wear and failure of the anti-rotation guide part and anti-rotation guide hole on the valve stem if they are used alone.

Description

Technical Field

[0001] This utility model relates to a bellows regulating valve. Background Technology

[0002] In petrochemical, coal chemical, and nuclear power industries, control valves have long faced the severe challenges of operating under high temperatures, highly corrosive media, and particulate matter. While traditional bellows control valves effectively solve the problem of media leakage at the valve stem, significant technical defects remain in practical applications. For example, under high-speed media impact, circumferential torsional stress is easily generated, leading to stress concentration at the bellows spiral weld, especially prone to fatigue fracture under frequent opening and closing conditions. Furthermore, in typical applications such as ammonia synthesis plants, traditional bellows control valves have short mean time between failures (MTBF), and each maintenance requires complete replacement of the bellows assembly. This problem severely restricts the reliability of bellows control valves in critical process units and significantly increases equipment maintenance costs. Utility Model Content

[0003] In view of the technical problems existing in the background art, the present invention aims to provide a bellows regulating valve with dual anti-rotation.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a double anti-rotation bellows regulating valve, comprising a bellows, a flange plate, a first guide sleeve, an adapter, an extension rod, a second guide sleeve, and a valve core disposed in the valve, characterized in that: the upper end of the bellows is welded to the flange plate, the flange plate has a through hole, the first guide sleeve is disposed on the upper side of the flange plate, the lower end of the bellows is welded to the adapter, the upper side of the adapter has a first threaded hole for threaded connection of the lower end of the valve stem, the valve stem has an anti-rotation guide part, the first guide sleeve has an anti-rotation guide hole, the anti-rotation guide part is disposed in the anti-rotation guide hole, the lower end of the adapter is threadedly connected to the extension rod, the lower end of the extension rod is threadedly connected to the valve core, the second guide sleeve is disposed outside the extension rod, the inner hole of the second guide sleeve has an anti-rotation axial groove, the side wall of the extension rod has an anti-rotation guide protrusion, the anti-rotation guide protrusion is disposed in the anti-rotation axial groove.

[0005] The following optimizations or supplementary explanations can be made to the above technical solutions.

[0006] For example, the anti-rotation guide hole is a regular hexagonal hole, and the anti-rotation guide part is set as a regular hexagonal prism segment on the valve stem.

[0007] The anti-rotation guide protrusion is set on the outer side wall of the extension rod; for example, the outer side wall of the extension rod is provided with a screw hole, and the anti-rotation guide protrusion is set with a set screw, which is connected to the screw hole.

[0008] In addition, the valve core includes a connected body and a guide shaft. The body is located at the lower end of the guide shaft. The valve also has a valve cage with a bushing on the valve cage and the guide shaft is disposed in the bushing.

[0009] In addition, the upper end of the extension rod is provided with a second threaded hole for the adapter to be threaded, and the upper end of the valve core is provided with a third threaded hole for the extension rod to be threaded; the third threaded hole is located at the upper end of the guide shaft.

[0010] This includes a valve body, an upper valve cover, and a lower valve cover. The upper valve cover is connected to the valve body, and the lower valve cover is connected to the upper valve cover. The first guide sleeve and flange plate are located between the small valve cover and the upper valve cover, and the second guide sleeve is located at the lower port of the upper valve cover.

[0011] For example, the second guide sleeve is welded to the lower port of the upper valve cover.

[0012] For example, the lower end of the upper valve cover is set as a stepped hole, and the lower end of the second guide sleeve is welded to the inner wall of the stepped hole.

[0013] The first guide sleeve and flange plate are sandwiched between the small valve cover and the upper valve cover.

[0014] In addition, sealing gaskets are respectively installed between the small valve cover and the first guide sleeve, between the first guide sleeve and the flange plate, and between the flange plate and the upper valve cover. The beneficial effects of this utility model are as follows: In this double anti-rotation bellows control valve, the first and second anti-rotation protection structures work together to form an upper and lower double anti-rotation protection structure, preventing bellows breakage (especially at the weld seam between the lower port and the adapter). The double anti-rotation protection complements each other and also avoids the problem of wear and failure of the anti-rotation guide part and anti-rotation guide hole on the valve stem if they are used alone. The addition of an extended rod makes the valve stem relatively shorter than that of a bellows control valve of the same specification, making concentricity easier to ensure and reducing the difficulty of valve stem processing. This double anti-rotation bellows control valve has an upper and lower double anti-rotation structure to prevent bellows breakage (especially at its lower port connection), improving valve quality, and shortening the relative length of the valve stem reduces the difficulty of manufacturing and processing, and better ensures the concentricity of the valve stem. Attached Figure Description

[0015] The following description, in conjunction with the accompanying drawings, details the embodiments and working principles of this utility model.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 for Figure 1 A magnified view of A in the middle.

[0018] Figure 3 for Figure 2 A cross-sectional view of the BB of the middle valve stem.

[0019] Figure 4 for Figure 1 A magnified view of C.

[0020] Figure 5 This utility model Figure 1 The structural diagram of the extended rod shows that the whole structure is a rotating body.

[0021] Figure 6 This utility model Figure 1 A schematic diagram of the structure of the first guide sleeve.

[0022] Figure 7 for Figure 6 Top view.

[0023] In the picture: 1. First guide sleeve; 10. Anti-rotation guide hole; 2. Second guide sleeve; 20. Anti-rotation axial groove; 3. Flange plate; 30. Through hole; 4. Corrugated pipe; 5. Adapter; 6. Extension rod; 60. Anti-rotation guide protrusion; 61. Screw hole; 7. Valve core; 70. Body; 71. Guide shaft; 8. Valve stem; 80. Anti-rotation guide; 9. Valve cage; 90. Bushing; 100. Valve body; 101. Upper valve cover; 102. Small valve cover; 103. Sealing gasket. 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 of the present utility model. Obviously, the described embodiments are only some embodiments of the implementation of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0025] Referring to the accompanying drawings, the double anti-rotation bellows regulating valve in this embodiment includes a bellows 4, a flange 3, a first guide sleeve 1, an adapter 5, an extension rod 6, a second guide sleeve 2, and a valve core 7, all disposed within the valve. The upper end of the bellows 4 is welded to the flange 3, which has a through hole 30 for the valve stem 8 to pass through and be installed. The first guide sleeve 1 is located on the upper side of the flange 3. The lower end of the bellows 4 is welded to the adapter 5, which has a first threaded hole on its upper side for threaded connection of the lower end of the valve stem 8. The valve also includes a valve stem 8, which has an anti-rotation guide portion 80. The first guide sleeve 1 has an anti-rotation guide hole 10, with the anti-rotation guide portion 80 positioned within the anti-rotation guide hole 10, forming a first layer of anti-rotation protection structure. The valve stem 8 moves up and down (along its axial direction). During operation, the adapter 5 will be raised and lowered, and the bellows 4 will also extend and retract. The valve stem 8, with its anti-rotation guide part 80 cooperating with the anti-rotation guide hole 10 (of the first guide sleeve 1), not only guides its raising and lowering to ensure stable operation, but also plays an anti-rotation role. The adapter 5 is also protected against rotation along with the valve stem 8, avoiding the problem of stress concentration in the bellows 4 (especially at the lower weld) caused by circumferential torsional stress due to medium impact (such as the adapter 5), and avoiding fatigue caused by this problem leading to the breakage of the bellows 4 (especially under frequent opening and closing conditions). Additionally, the lower end of the adapter 5 is threadedly connected to the extension rod 6, and the lower end of the extension rod 6 is threadedly connected to the valve core 7. The adapter 5 will drive the valve core 7 (lifting and lowering) through the extension rod 6. The second guide sleeve 2 is fitted outside the extension rod 6, and the extension rod 6 is guided within the inner hole of the second guide sleeve 2, making its lifting and lowering more stable. Furthermore, the inner hole of the second guide sleeve 2 is provided with an anti-rotation axial groove 20, and the side wall of the extension rod 6 is provided with an anti-rotation guide protrusion 60, which is disposed within the anti-rotation axial groove 20. In addition to serving as a guide for lifting (i.e., axial direction) within the anti-rotation axial groove 20, the extension rod 6 can also form a second anti-rotation protection structure. The extension rod 6, guided by its anti-rotation guide protrusion 60 within the anti-rotation axial groove 20, not only guides the lifting of the extension rod 6 for stable operation but also plays an anti-rotation role. This avoids the problem of stress concentration in the bellows 4 (especially at the lower weld) caused by circumferential torsional stress due to media impact, and prevents fatigue-induced fracture of the bellows 4 due to this problem (especially under frequent opening and closing conditions).

[0026] In this double anti-rotation bellows control valve, the first and second anti-rotation protection structures work together to form an upper and lower double anti-rotation protection structure, which prevents the bellows 4 (especially at the weld between the lower end and the adapter 5) from breaking. The double anti-rotation protection complements each other and also avoids the problem that the anti-rotation guide part 80 and the anti-rotation guide hole 10 on the valve stem 8 are prone to wear and failure when used alone. The addition of the extended rod 6 makes the valve stem 8 relatively shorter and the concentricity easier to ensure compared with the bellows control valve of the same specification. The processing difficulty of the valve stem 8 is also reduced.

[0027] This double anti-rotation bellows control valve has an upper and lower double anti-rotation structure to prevent the bellows 4 (especially at its lower port connection) from breaking, thus improving the quality of the valve. It also shortens the relative length of the valve stem 8, making its manufacturing and processing more difficult, and better ensuring the concentricity of the valve stem 8.

[0028] The following optimizations or further explanations can be made based on the above embodiments.

[0029] For example, the anti-rotation guide hole 10 is usually an equilateral hole, such as a regular hexagonal hole, and the anti-rotation guide part 80 is set as a regular hexagonal prism segment on the valve stem 8. The double anti-rotation protection also makes them less prone to wear and rounding, which could lead to failure.

[0030] The anti-rotation guide protrusion 60 is set on the outer side wall of the extension rod 6. The outer side wall of the extension rod 6 is provided with a screw hole 61. The anti-rotation guide protrusion 60 is provided with a set screw, which is connected to the screw hole 61. The set screw can be an internal hexagon set screw, which facilitates the disassembly, replacement and maintenance of the anti-rotation guide protrusion 60.

[0031] The valve core 7 includes a connected body 70 and a guide shaft 71 (which can usually be an integral structure). The body 70 is located at the lower end of the guide shaft 71. The valve also has a valve cage 9, on which a bushing 90 is provided. The guide shaft 71 is disposed in the bushing 90, making the valve core 7 run more stably and less prone to shaking or vibration.

[0032] For example, the upper end of the extension rod 6 is provided with a second threaded hole for the adapter 5 to be threadedly connected, and the upper end of the valve core 7 is provided with a third threaded hole for the extension rod 6 to be threadedly connected; the third threaded hole is located at the upper end of the guide shaft part 71. For example, the external stud at the lower end of the valve stem 8 is connected to the first threaded hole of the adapter 5, the external stud at the lower end of the adapter 5 is connected to the second threaded hole of the extension rod 6, and the external stud of the extension rod 6 is connected to the third threaded hole of the valve core 7.

[0033] This double anti-rotation bellows control valve also includes a valve body 100, an upper valve cover 101, and a small valve cover 102. The upper valve cover 101 is connected to the valve body 100, and the small valve cover 102 is connected to the upper valve cover 101. Their connection is typically achieved using bolts or other fasteners for locking, a mature technology. The first guide sleeve 1 and the flange plate 3 can be positioned between the small valve cover 102 and the upper valve cover 101, while the second guide sleeve 2 is positioned at the lower end of the upper valve cover 101, resulting in a relatively reasonable structural arrangement. For example, the second guide sleeve 2 can be welded into the lower end of the upper valve cover 101; for instance, if the lower end of the upper valve cover 101 is a stepped hole, the lower end of the second guide sleeve 2 can be welded to the inner wall of this stepped hole (with a weld point at position 200). For example, the first guide sleeve 1 and the flange plate 3 are sandwiched between the small valve cover 102 and the upper valve cover 101. The first guide sleeve 1 and the flange plate 3 are directly clamped and locked together with the small valve cover 102 when connected and locked to the upper valve cover 101, which is more convenient. In addition, sealing gaskets 103 are respectively provided between the small valve cover 102 and the first guide sleeve 1, between the first guide sleeve 1 and the flange plate 3, and between the flange plate 3 and the upper valve cover 101 to increase the sealing between them and prevent leakage. Usually, an annular stepped sealing gasket 103 is provided at the circumferential edge of the end face of the first guide sleeve 1 and the flange plate 3 for easy installation.

Claims

1. A double anti-rotation bellows regulating valve, comprising a bellows (4), a flange (3), a first guide sleeve (1), an adapter (5), an extension rod (6), a second guide sleeve (2), and a valve core (7) disposed in the valve, characterized in that: The upper end of the bellows (4) is welded to the flange plate (3), and the flange plate (3) is provided with a through hole (30). The upper side of the flange plate (3) is provided with a first guide sleeve (1). The lower end of the bellows (4) is welded to the adapter (5). The upper side of the adapter (5) has a first threaded hole for the lower end of the valve stem (8) to be threaded. The valve stem (8) is provided with an anti-rotation guide part (80). The first guide sleeve (1) is provided with an anti-rotation guide hole (10). The anti-rotation guide part (80) is arranged in the anti-rotation guide hole (10). The lower end of the adapter (5) is threadedly connected to the extension rod (6), and the lower end of the extension rod (6) is threadedly connected to the valve core (7). The second guide sleeve (2) is fitted outside the extension rod (6). The inner hole of the second guide sleeve (2) is provided with an anti-rotation axial groove (20), and the side wall of the extension rod (6) is provided with an anti-rotation guide protrusion (60), which is arranged in the anti-rotation axial groove (20).

2. The dual anti-rotation bellow trim valve of claim 1, wherein: The anti-rotation guide hole (10) is a regular hexagonal hole, and the anti-rotation guide part (80) is set as a regular hexagonal prism section on the valve stem (8).

3. The dual anti-rotation bellow trim valve of claim 1, wherein: The anti-rotation guide protrusion (60) is provided on the outer side wall of the extension rod (6). The outer wall of the extension rod (6) is provided with a screw hole (61), and the anti-rotation guide protrusion (60) is provided with a set screw, which is connected to the screw hole (61).

4. The dual anti-rotation bellow trim valve of claim 1, wherein: The valve core (7) includes a connected body (70) and a guide shaft (71). The body (70) is located at the lower end of the guide shaft (71). The valve also has a valve cage (9), on which a bushing (90) is provided. The guide shaft (71) is disposed in the bushing (90).

5. The dual anti-rotation bellow trim valve of claim 4, wherein: The upper end of the extension rod (6) is provided with a second threaded hole for the adapter (5) to be threaded, and the upper end of the valve core (7) is provided with a third threaded hole for the extension rod (6) to be threaded; the third threaded hole is located at the upper end of the guide shaft (71).

6. The dual anti-rotation bellow trim valve of claim 1, wherein: It also includes a valve body (100), an upper valve cover (101), and a small valve cover (102), the upper valve cover (101) being connected to the valve body (100), and the small valve cover (102) being connected to the upper valve cover (101). The first guide sleeve (1) and the flange plate (3) are arranged between the small valve cover (102) and the upper valve cover (101). The second guide sleeve (2) is located at the lower port of the upper valve cover (101).

7. The dual anti-rotation bellow trim valve of claim 6, wherein: The second guide sleeve (2) is welded to the lower port of the upper valve cover (101).

8. The bellows regulating valve with dual anti-rotation as described in claim 7, characterized in that: The lower end of the upper valve cover (101) is set as a stepped hole, and the lower end of the second guide sleeve (2) is welded to the inner wall of the stepped hole.

9. The dual anti-rotation bellow trim valve of claim 6, wherein: The first guide sleeve (1) and the flange plate (3) are sandwiched between the small valve cover (102) and the upper valve cover (101).

10. The dual anti-rotation bellow trim valve of claim 9, wherein: Sealing gaskets (103) are respectively provided between the small valve cover (102) and the first guide sleeve (1), between the first guide sleeve (1) and the flange plate (3), and between the flange plate (3) and the upper valve cover (101).

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