Integrated welded bellows regulating valve

Abstract

This utility model relates to the field of bellows control valve technology, and in particular to an integrated welded bellows control valve, comprising a valve body with a flow channel, a matching valve seat and valve core on the flow channel, a valve stem on the valve core, a bellows, an upper valve cover support ring, and a connecting pipe. One end of the connecting pipe is welded to the valve body, and the other end of the connecting pipe is fixedly connected to the upper valve cover. The support ring is sealed between the other end of the connecting pipe and the upper valve cover. In use, this integrated welded bellows control valve replaces the original separate bellows seal with a seal between the integrated welded bellows connecting pipe and the upper valve cover, a seal between the upper valve cover and the valve stem, and a welded seal between the connecting pipe and the valve body. This multi-seal structure greatly reduces the possibility of media leakage. Simultaneously, the anti-rotation mechanism between the valve core and the valve body further stabilizes the valve structure, thereby improving the valve's sealing performance and safety reliability.

Description

Technical Field

[0001] This utility model relates to the field of bellows regulating valve technology, and in particular to an integrated welded bellows regulating valve. Background Technology

[0002] Traditional bellows control valves mostly employ a split structure, where the bellows section and valve body flange are mechanically assembled via threaded connections or bolt press-fit. While this structure meets basic sealing requirements for conventional operating conditions to a certain extent, it has drawbacks when handling special media. Micrometer-level gaps exist at the mechanical connection surfaces, making them highly susceptible to seepage and leakage when the medium consists of small molecules. Particularly when handling flammable, explosive, highly toxic, corrosive, or radioactive media, leakage and contact with air can easily lead to explosions and other serious safety accidents. To address this challenge and improve the valve's sealing performance and reliability, this paper proposes an integrated welded bellows control valve. Utility Model Content

[0003] The technical problem this utility model aims to solve is: Traditional bellows valves often employ a split structure, where the bellows section and valve body flange are mechanically assembled via threaded connections or bolt press-fitting. This results in micron-level assembly gaps at the mechanical connection surfaces, making them prone to leakage when the medium is a small molecule substance. Especially when handling flammable, explosive, highly toxic, corrosive, or radioactive media, leakage and contact with air can easily lead to explosions and other serious safety accidents. Therefore, this invention provides an integrated welded bellows regulating valve.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: an integrated welded bellows regulating valve, including a valve body, a flow channel provided on the valve body, a matching valve seat and valve core provided on the flow channel, a valve stem provided on the valve core, a bellows, an upper valve cover support ring, and a connecting pipe. One end of the connecting pipe is welded to the valve body, and the other end of the connecting pipe is fixedly connected to the upper valve cover. The support ring is sealed between the other end of the connecting pipe and the upper valve cover. The end of the valve stem away from the valve core passes through the connecting pipe and the upper valve cover in sequence and protrudes from the upper valve cover. A sealing packing is provided between the upper valve cover and the valve stem. A pressure plate for pressing the sealing packing is provided on the upper valve cover. The bellows is sleeved on the valve stem. One end of the bellows is fixedly connected to the support ring, and the other end of the bellows is fixed to the valve stem. An anti-rotation mechanism for preventing the valve core from rotating is provided between the valve core and the valve body. Compared to existing technologies, this solution replaces the original separate bellows seal with a seal between the connecting pipe and the upper valve cover, a seal between the upper valve cover and the valve stem, and a welded seal between the connecting pipe and the valve body. This multi-seal structure greatly reduces the possibility of media leakage. At the same time, the anti-rotation mechanism between the valve core and the valve body makes the valve structure more stable, thereby improving the valve's sealing performance and safety reliability.

[0005] To achieve a seal between the connecting pipe and the upper valve cover, in some preferred embodiments, sealing gaskets are provided between the support ring and the connecting pipe, and between the support ring and the upper valve cover. By providing sealing gaskets between the support ring and the connecting pipe and the upper valve cover at both ends, a seal between the connecting pipe and the upper valve cover is ensured.

[0006] In order to fix the lower end of the bellows to the valve stem, in some preferred embodiments, a fixing seat is fixedly connected to the valve stem, the fixing seat is located inside the connecting pipe, and the other end of the bellows is fixedly connected to the fixing seat.

[0007] In some preferred embodiments, the upper end of the bellows is fixed to the support ring by welding, and the lower end of the bellows is fixed to the fixing seat by welding.

[0008] To implement the anti-rotation mechanism, in some preferred embodiments, the anti-rotation mechanism includes an anti-rotation pin, which is fixedly installed on the valve core along a direction perpendicular to the valve core's displacement path. A limiting groove is formed on the valve body along the displacement direction of the anti-rotation pin, and one end of the anti-rotation pin is located within the limiting groove. The anti-rotation of the valve core is achieved through the cooperation between the anti-rotation pin on the valve core and the limiting groove on the valve body.

[0009] In some preferred embodiments, one end of the anti-rotation pin is threaded onto the valve core.

[0010] In some preferred embodiments, the valve body has a sliding hole that matches the valve core, the end of the valve core away from the valve seat is slidably disposed in the sliding hole, and the limiting groove is disposed on the inner peripheral wall of the sliding hole.

[0011] In some preferred embodiments, a first sealing ring and a second sealing ring are provided between the valve seat and the valve body. The first sealing ring is used for axial sealing between the valve core and the valve body, and the second sealing ring is used for circumferential sealing between the valve core and the valve body.

[0012] The beneficial effects of this utility model are as follows: When using the integrated welded bellows regulating valve, the original separate sealing of the bellows is replaced by sealing between the connecting pipe and the upper valve cover, between the upper valve cover and the valve stem, and a welded seal between the connecting pipe and the valve body. This multi-seal structure significantly reduces the possibility of media leakage. Simultaneously, the anti-rotation mechanism between the valve core and the valve body further stabilizes the valve structure, thereby improving its sealing performance and reliability. This avoids the problem of traditional bellows valves using a split structure, where the bellows section and valve body flange are mechanically assembled via threaded connections or bolt press-fitting. The mechanical connection surface has micron-level assembly gaps, making it prone to seepage and leakage when the medium is a small molecule substance. Especially when handling flammable, explosive, highly toxic, corrosive, or radioactive media, leakage and contact with air can easily lead to explosions and other serious safety accidents. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 yes Figure 1 A magnified view of part A in the image;

[0016] Figure 3 yes Figure 1 A magnified view of part B in the image.

[0017] In the diagram: 1. Valve body, 2. Flow channel, 3. Valve seat, 4. Valve core, 5. Valve stem, 6. Bellows, 7. Upper valve cover, 8. Support ring, 9. Connecting pipe, 10. Sealing packing, 11. Pressure plate, 12. Sealing gasket, 13. Fixed seat, 14. Anti-rotation pin, 15. Limiting groove, 16. Sliding hole, 17. First sealing ring, 18. Second sealing ring. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the embodiments:

[0019] This utility model is not limited to the following specific embodiments. Those skilled in the art can implement this utility model using various other specific embodiments based on the disclosed content. Any modifications or alterations to the design structure and concept of this utility model also fall within the protection scope of this utility model. It should be noted that, unless otherwise specified, the embodiments and features described in this utility model can be combined with each other.

[0020] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] like Figure 1-3 As shown, an integrated welded bellows regulating valve includes a valve body 1, a bellows 6, an upper valve cover 7, a support ring 8, and a connecting pipe 9. The valve body 1 has a flow channel 2, on which a matching valve seat 3 and valve core 4 are mounted. A valve stem 5 is mounted on the valve core 4. One end of the connecting pipe 9 is welded to the valve body 1, and the other end is fixedly connected to the upper valve cover 7. The support ring 8 is sealed between the other end of the connecting pipe 9 and the upper valve cover 7. The end of the valve stem 5 furthest from the valve core 4 passes through the connecting pipe 9 and the upper valve cover 7 and protrudes from the upper valve cover 7. A sealing packing 10 is provided between the upper valve cover 7 and the valve stem 5. A pressure plate 11 is provided on the upper valve cover 7 to press the sealing packing 10. The pressure plate 11 is fixed to the upper valve cover 7 by screws. The bellows 6 is sleeved on the valve stem 5. One end of the bellows 6 is fixedly connected to the support ring 8, and the other end is fixed to the valve stem 5. An anti-rotation mechanism is provided between the valve core 4 and the valve body 1 to prevent the valve core 4 from rotating.

[0023] Sealing gaskets 12 are provided between the support ring 8 and the connecting pipe 9, and between the support ring 8 and the upper valve cover 7. A first positioning groove is provided on the connecting pipe 9, and the support ring 8 is placed in the first positioning groove. A first positioning protrusion is provided at the upper end of the support ring 8. A second positioning groove matching the first positioning protrusion is provided on the upper valve cover 7. At the same time, an annular positioning protrusion is provided on the upper valve cover 7. An annular positioning groove is formed between the inner peripheral wall of the connecting pipe 9 and the first positioning protrusion. The annular positioning groove matches the annular positioning protrusion, and the annular positioning protrusion is located in the annular positioning groove.

[0024] A fixed seat 13 is fixedly connected to the valve stem 5. The fixed seat 13 is located inside the pipe 9. The other end of the bellows 6 is fixedly connected to the fixed seat 13. The upper end of the bellows 6 is fixed to the support ring 8 by welding, and the lower end of the bellows 6 is fixed to the fixed seat 13 by welding.

[0025] The anti-rotation mechanism includes an anti-rotation pin 14, which is fixedly installed on the valve core 4 in a direction perpendicular to the displacement path of the valve core 4. A limiting groove 15 is formed on the valve body 1 along the displacement direction of the anti-rotation pin 14. One end of the anti-rotation pin 14 is located in the limiting groove 15, and the other end of the anti-rotation pin 14 is threaded to the valve core 4. A sliding hole 16 matching the valve core 4 is formed on the valve body 1. The end of the valve core 4 away from the valve seat 3 is slidably disposed in the sliding hole 16. The limiting groove 15 is disposed on the inner peripheral wall of the sliding hole 16.

[0026] A first sealing ring 17 and a second sealing ring 18 are provided between the valve seat 3 and the valve body 1. The first sealing ring 17 is used for axial sealing between the valve core 4 and the valve body 1, and the second sealing ring 18 is used for circumferential sealing between the valve core 4 and the valve body 1. In this embodiment, the first sealing ring 17 is a PTFE gasket 12, and the second sealing ring 18 is an O-ring. The valve seat 3 and the valve core 4 are doubly sealed using an O-ring and a PTFE gasket 12, which increases the sealing performance between the valve seat 3 and the valve body 1.

[0027] When the above-mentioned integrated welded bellows regulating valve is used, the valve body 1 and the connecting pipe 9 are welded together to reduce the deformation of the valve body 1 cavity caused by welding, increase the sealing performance of the valve body 1, and facilitate the installation of valve internals. A pin groove is made in the inner cavity of the valve body 1, and a hole is drilled on the valve core 4 to connect with the anti-rotation pin 14 to form an anti-rotation structure, so that the valve remains stable under the action of high frequency vibration for a long time and avoids twisting the bellows 6. Two large sealing gaskets 12 are installed on the upper and lower parts of the support ring 8 to ensure sealing performance. The sealing packing 10 of the upper valve cover 7 forms a multiple seal.

[0028] The above description, based on the preferred embodiments of this utility model, provides inspiration. Those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification but must be determined according to the claims.

Claims

1. An integrated welded bellows regulating valve, comprising a valve body (1), wherein a flow channel (2) is provided on the valve body (1), a matching valve seat (3) and a valve core (4) are provided on the flow channel (2), and a valve stem (5) is provided on the valve core (4), characterized in that: It also includes a bellows (6), an upper valve cover (7), a support ring (8), and a connecting pipe (9). One end of the connecting pipe (9) is welded to the valve body (1), and the other end of the connecting pipe (9) is fixedly connected to the upper valve cover (7). The support ring (8) is sealed between the other end of the connecting pipe (9) and the upper valve cover (7). The end of the valve stem (5) away from the valve core (4) passes through the connecting pipe (9) and the upper valve cover (7) in sequence and protrudes from the upper valve cover (7). A sealing packing (10) is provided between the cover (7) and the valve stem (5). A pressure plate (11) for pressing the sealing packing (10) is provided on the upper valve cover (7). The bellows (6) is sleeved on the valve stem (5). One end of the bellows (6) is fixedly connected to the support ring (8), and the other end of the bellows (6) is fixed to the valve stem (5). An anti-rotation mechanism for preventing the valve core (4) from rotating is provided between the valve core (4) and the valve body (1).

2. The integrated welded bellows regulating valve according to claim 1, characterized in that: Sealing gaskets (12) are provided between the support ring (8) and the connecting pipe (9), and between the support ring (8) and the upper valve cover (7).

3. The integrated welded bellows regulating valve according to claim 1, characterized in that: A fixed seat (13) is fixedly connected to the valve stem (5). The fixed seat (13) is located inside the pipe (9). The other end of the bellows (6) is fixedly connected to the fixed seat (13).

4. The integrated welded bellows regulating valve according to claim 3, characterized in that: The upper end of the corrugated pipe (6) is fixed to the support ring (8) by welding, and the lower end of the corrugated pipe (6) is fixed to the fixing seat (13) by welding.

5. The integrated welded bellows regulating valve according to claim 1, characterized in that: The anti-rotation mechanism includes an anti-rotation pin (14), which is fixedly installed on the valve core (4) in a direction perpendicular to the displacement path of the valve core (4). A limiting groove (15) is formed on the valve body (1) along the displacement direction of the anti-rotation pin (14), and one end of the anti-rotation pin (14) is located in the limiting groove (15).

6. The integrated welded bellows regulating valve according to claim 5, characterized in that: One end of the anti-rotation pin (14) is threaded onto the valve core (4).

7. The integrated welded bellows regulating valve according to claim 6, characterized in that: The valve body (1) has a sliding hole (16) that matches the valve core (4). The end of the valve core (4) away from the valve seat (3) is slidably disposed in the sliding hole (16). The limiting groove (15) is disposed on the inner peripheral wall of the sliding hole (16).

8. The integrated welded bellows regulating valve according to claim 1, characterized in that: A first sealing ring (17) and a second sealing ring (18) are provided between the valve seat (3) and the valve body (1). The first sealing ring (17) is used for axial sealing between the valve core (4) and the valve body (1), and the second sealing ring (18) is used for circumferential sealing between the valve core (4) and the valve body (1).

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