Bottom-mounted nested high-temperature dustproof ball valve

Abstract

The utility model discloses a bottom-mounted nesting high-temperature dustproof ball valve which comprises a valve body, a valve rod, a ball body and a nesting assembly arranged between the valve body and the ball body, the nesting assembly is provided with a first corrugated pipe at the joint of the ball body and the valve body, one end of the first corrugated pipe is fixed with the nesting assembly, and a valve seat is fixed at the other end of the first corrugated pipe. The nesting assembly is provided with dustproof rings on the connecting face of the nesting assembly and the valve body and the connecting face of the nesting assembly and the ball body, a valve port is formed in the bottom of the valve body, the nesting assembly, the valve rod and the ball body are all installed in the valve body from the valve port, a valve cover is arranged at the valve port in a matched mode, and a second corrugated pipe is arranged between the top of the ball body and the valve body. The two ends of the second corrugated pipe abut against the ball body and the valve body respectively. By means of innovative dynamic sealing compensation, multi-stage dustproof layout and bottom-mounted maintenance design, sealing reliability, environmental adaptability and operation convenience are comprehensively improved, and the sealing device is suitable for harsh working conditions such as petroleum, chemical engineering and electric power and has remarkable technical advantages and application value.

Description

Technical Field

[0001] This utility model relates to a bottom-mounted nested high-temperature dustproof ball valve. Background Technology

[0002] Traditional ball valves are prone to problems such as sealing failure, rapid seat wear, and poor dustproof performance under high temperature and high pressure environments. Current technologies use hard seals or packing seals for some ball valves, but these are insufficient to simultaneously meet the requirements of high-temperature expansion compensation and dustproofing, and their complex structure makes maintenance inconvenient. Furthermore, the valve stem is susceptible to intrusion of external particles, leading to jamming and affecting service life. Utility Model Content

[0003] To address the aforementioned problems, this utility model provides a bottom-mounted nested high-temperature dustproof ball valve. By integrating a bellows, valve seat, dustproof ring, and spring through a nested assembly, redundant sealing is formed, significantly improving pressure resistance and high-temperature adaptability, and effectively solving the problems pointed out in the background art.

[0004] The technical solution adopted in this utility model is:

[0005] A bottom-mounted nested high-temperature dustproof ball valve includes a valve body, a valve stem, and a ball, as well as a nested assembly disposed between the valve body and the ball. The nested assembly has a first bellows at the connection between the ball and the valve body. One end of the first bellows is fixed to the nested assembly, and the other end is fixed to a valve seat. The nested assembly has dustproof rings on the connection surface between the nested assembly and the valve body, and on the connection surface between the nested assembly and the ball. The bottom of the valve body has a valve port. The nested assembly, valve stem, and ball are all inserted into the valve body through the valve port. A valve cover is matched at the valve port. A second bellows is disposed between the top of the ball and the valve body, and the two ends of the second bellows rest on the ball and the valve body, respectively.

[0006] Preferably, a locating pin is provided between the top of the nested assembly and the valve body.

[0007] Preferably, a spring is provided between the bottom of the nested assembly and the valve cover, with the two ends of the spring pressing against the nested assembly and the valve cover respectively.

[0008] Preferably, the valve cover is fixed to the valve body by bolts.

[0009] Preferably, the valve stem is provided with an upper cover at an external position of the valve body, and a low-leakage packing is provided between the upper cover and the valve stem.

[0010] Preferably, the top cover is fixed to the valve body by bolts.

[0011] Preferably, the ball is welded to the valve seat with hard alloy.

[0012] Preferably, the valve stem is provided with an anti-blowout structure.

[0013] Preferably, the anti-blowout structure is a limiting boss, which is located at the lower part of the valve stem and inside the valve body cavity.

[0014] This utility model comprehensively improves sealing reliability, environmental adaptability, and ease of operation through innovative dynamic sealing compensation, multi-level dustproof layout, and bottom-mounted maintenance design. It is suitable for harsh working conditions such as petroleum, chemical, and power industries, and has significant technical advantages and application value.

[0015] The beneficial effects of this utility model are:

[0016] 1. Multi-layer dynamic sealing performance:

[0017] This ball valve adopts a nested component to integrate the valve seat and bellows, forming a redundant sealing structure. At room temperature, the valve seat provides initial sealing force through the pre-tightening deformation of the bellows. Under high temperature conditions, the bellows expands due to heat, pushing the valve seat to further compress the ball, realizing dynamic sealing compensation. This design effectively solves the problem of sealing failure caused by uneven material expansion at high temperatures in traditional hard seals, and significantly improves the sealing reliability under high temperature and high pressure environments.

[0018] 2. Systematic dustproof design:

[0019] Double dustproof valve stem: The valve stem is equipped with a double barrier structure of bellows and dustproof ring. The bellows isolates external dust, and the dustproof ring further prevents particulate matter from entering along the valve stem gap, ensuring smooth switching operation;

[0020] Multi-level dustproof layout: Dustproof rings are provided on the contact surfaces between the nested components and the valve body and ball to prevent dust or slurry in the medium from entering the sealing area. Experimental data shows that this design can reduce particulate matter intrusion by more than 90% and greatly extend the service life of the valve seat and ball sealing surfaces.

[0021] 3. High temperature and high pressure resistance and wear resistance:

[0022] Hard alloy sealing surface: The ball and valve seat are overlaid with a hard alloy layer with a Rockwell hardness of HRC60 or higher. The wear resistance is 3 times higher than that of ordinary sealing surfaces, making it suitable for high temperature and strong corrosive media conditions.

[0023] Nested components enhance pressure resistance: The nested components are fixed to the valve body by positioning pins, forming a compact multi-layer structure with a pressure resistance rating of up to Class 1500, which is 30% higher than that of traditional ball valves. It is suitable for high-pressure pipeline systems in petroleum, chemical and other industries.

[0024] 4. Convenient maintenance and stability:

[0025] Bottom-mounted stem design: The stem is installed from below and equipped with a blow-out prevention structure and positioning pin, which supports online replacement of low-leakage packing without disassembling the valve, reducing maintenance time by more than 50%;

[0026] Anti-rotational vibration: The nested components are locked to the valve body by positioning pins to prevent component displacement caused by vibration during opening and closing, thus ensuring the long-term operational stability of the valve;

[0027] 5. Improved overall service life:

[0028] Through multiple technical optimizations such as dust prevention, wear resistance, and dynamic sealing compensation, this ball valve has a service life that is more than twice that of traditional ball valves under high temperature and high pressure conditions, and the maintenance cycle is greatly extended, significantly reducing the user's operation and maintenance costs. Attached Figure Description

[0029] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0030] Figure 2 for Figure 1 Enlarged view of part A. Detailed Implementation

[0031] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0032] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0033] Furthermore, in the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" 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, unless otherwise expressly defined.

[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 according to the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0038] like Figure 1-2 As shown, a bottom-mounted nested high-temperature dustproof ball valve includes a valve body 1, a valve stem 2, and a ball 3, as well as a nested assembly 4 disposed between the valve body 1 and the ball 3. The nested assembly 4 has a first bellows 5 at the connection between the ball 3 and the valve body 1. One end of the first bellows 5 is fixed to the nested assembly 4, and the other end is fixed to a valve seat 6. The nested assembly 4 has dustproof rings 7 on the connection surface between the nested assembly 4 and the valve body 1, and on the connection surface between the nested assembly 4 and the ball 3. The bottom of the valve body 1 has a valve port. The nested assembly 4, the valve stem 2, and the ball 3 are all inserted into the valve body 1 through the valve port. A valve cover 8 is matched at the valve port. A second bellows 9 is disposed between the top of the ball 3 and the valve body 1. The two ends of the second bellows 9 rest on the ball 3 and the valve body 1, respectively.

[0039] A positioning pin 10 is provided between the top of the nested component 4 and the valve body 1.

[0040] A spring 11 is provided between the bottom of the nested component 4 and the valve cover 8, with the two ends of the spring 11 pressing against the nested component 4 and the valve cover 8 respectively.

[0041] The valve cover 8 is fixed to the valve body 1 by bolts.

[0042] The valve stem 2 is provided with an upper cover 12 on the outside of the valve body 1, and a low-leakage packing 13 is provided between the upper cover 12 and the valve stem 2.

[0043] The upper cover 12 is fixed to the valve body 1 by bolts.

[0044] The ball 3 and the valve seat 6 are welded together with hard alloy.

[0045] The valve stem 2 is provided with an anti-blowout structure.

[0046] The anti-blowout structure is a limiting boss 14, which is located at the lower part of the valve stem 2 and inside the valve body 1 cavity.

[0047] The working principle of this utility model is as follows:

[0048] Under high temperature and high pressure conditions, the valve achieves dynamic compensation of the valve seat 6, the synergistic effect of multi-level dustproof barriers and hard alloy sealing surfaces through the first bellows 5, ensuring sealing reliability and durability. The bottom-mounted valve stem design simplifies the maintenance process, the positioning pin 10 and the anti-blowout structure improve operational stability, and the multi-layer sealing and pressure-resistant design of the nested components make it perform well in harsh environments such as petroleum, chemical, and power industries, with an overall service life that is more than twice that of traditional ball valves.

[0049] Specifically as follows:

[0050] Basic opening and closing mechanism:

[0051] This ball valve controls the flow of fluid by rotating the ball 3. The ball has a through hole in the center. When the through hole is aligned with the pipeline axis, the valve is open and the medium can flow freely. Rotating the valve stem 2 causes the ball to rotate 90°. When the through hole is perpendicular to the pipeline axis, the valve is closed and the medium flow is blocked. The valve stem 2 and the ball 3 are connected by a keyway or tenon to ensure accurate and reliable transmission.

[0052] Dynamic sealing compensation mechanism:

[0053] The valve seat 6, fixed by the first bellows 5, works in conjunction with the spring 11: the valve seat 6 is pre-tightly installed between the nested assembly 1 and the ball 3 through the first bellows 5. At room temperature, the elastic deformation of the first bellows 5 provides the initial sealing force, making the valve seat 6 and the ball 3 fit tightly together; high temperature expansion automatically enhances the seal: under high temperature conditions (such as ≤600℃), the first bellows 5 expands due to heat, pushing the valve seats 6 on both sides to further compress the ball 3, forming dynamic seal compensation. This design effectively offsets the material deformation differences caused by high temperature and avoids the leakage problem caused by uneven thermal expansion of traditional hard seals.

[0054] The second bellows and spring assist in pressure balancing: the spring 11 is located at the bottom of the nested assembly 4, and the second bellows 9 is located at the top of the ball 3. The contact pressure between the valve cover 8 and the nested assembly 4, and between the ball 3 and the valve body 1 is balanced by elastic deformation, ensuring the stable fixation of the valve cover 8, the nested assembly 4, the ball 3 and the valve body 1.

[0055] Multi-level dustproof design achieves:

[0056] Dustproof valve stem: Second bellows 9 isolates external particles: The valve stem 2 is wrapped with a second bellows 9 to prevent dust and particles in the environment from entering the valve stem movement area;

[0057] Multi-level dust protection for nested components: Dust ring 7 layout on contact surface: Dust rings 7 are provided between nested component 4 and valve body 1, and between nested component 4 and ball 3, to prevent dust or slurry in the medium from entering the sealing area and avoid wear on the sealing surface.

[0058] Bellows failure protection: Even if the dust seal 7 is worn, the second bellows 9 between the ball 3 and the valve body 1 can still prevent the medium from entering, ensuring the long-term stable operation of the valve.

[0059] Maintenance advantages of bottom-mounted valve stems

[0060] Online maintenance design: The valve stem 7 adopts a bottom-mounted structure and is installed through the valve port at the bottom of the valve body. When replacing the low-leakage packing 13 or performing maintenance, only the top cover 12 and some components need to be removed, without the need to completely dismantle the valve, which greatly shortens the maintenance time (by more than 50%).

[0061] Anti-blowout structure and positioning pin: An anti-blowout structure is provided at the end of the valve stem 2 to prevent the valve stem 2 from being dislodged due to the impact of high pressure medium; the nested component 4 is fixed to the valve body 1 by the positioning pin 10 to prevent the nested component 4 from rotating or displacing due to vibration during the opening and closing process, thus ensuring operational stability.

[0062] Enhanced performance of carbide sealing surfaces:

[0063] Wear-resistant and high-temperature resistant design: The surfaces of ball 3 and valve seat 6 are overlaid with a hard alloy layer (such as tungsten carbide), with a Rockwell hardness of HRC60 or higher. The wear resistance is 3 times higher than that of ordinary sealing surfaces, and it can be used for a long time in high temperature (≤600℃) and strong corrosive media conditions.

[0064] Self-cleaning function of sealing surface: When the ball 3 rotates, the friction between the hard alloy layer and the valve seat 6 can scrape off the particles attached to the surface, maintain the smoothness of the sealing surface, and reduce the risk of leakage.

[0065] The resilience and stability of nested components:

[0066] Multi-layer sealing redundancy design: The nested component 4 is fully embedded in the valve body 1, forming a multi-layer sealing structure including the valve seat 6 fixed by the first bellows 5, the dustproof ring 7, etc., with a pressure resistance rating of up to Class 1500, which is 30% higher than that of traditional ball valves.

[0067] Compact structure optimization: The nested component 4 is fixed to the valve body 1 by the positioning pin 10, which reduces the internal cavity, reduces the risk of medium retention, and enhances the vibration resistance, making it suitable for high-pressure and high-frequency switching scenarios.

[0068] Finally, it should be noted that the above examples are merely specific embodiments of this utility model. Obviously, this utility model is not limited to the above embodiments and can have many variations. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of this utility model should be considered within the protection scope of this utility model.

Claims

1. A bottom-mounted nested high-temperature dustproof ball valve, characterized in that, The device includes a valve body (1), a valve stem (2), and a ball (3), as well as a nested assembly (4) disposed between the valve body (1) and the ball (3). The nested assembly (4) has a first bellows (5) at the connection between the ball (3) and the valve body (1). One end of the first bellows (5) is fixed to the nested assembly (4), and the other end is fixed to a valve seat (6). The nested assembly (4) has dustproof rings (7) on the connection surface between the nested assembly (4) and the valve body (1) and the connection surface between the nested assembly (4) and the ball (3). The bottom of the valve body (1) has a valve port. The nested assembly (4), the valve stem (2), and the ball (3) are all inserted into the valve body (1) from the valve port. A valve cover (8) is matched at the valve port. A second bellows (9) is disposed between the top of the ball (3) and the valve body (1). The two ends of the second bellows (9) are respectively pressed against the ball (3) and the valve body (1).

2. The bottom-mounted nested high-temperature dustproof ball valve according to claim 1, characterized in that, A positioning pin (10) is provided between the top of the nested component (4) and the valve body (1).

3. A lower-mounted nested high-temperature dust-proof ball valve according to claim 2, characterized in that, A spring (11) is provided between the bottom of the nested component (4) and the valve cover (8), with the two ends of the spring (11) pressing against the nested component (4) and the valve cover (8) respectively.

4. A lower-mounted nested high-temperature dust-proof ball valve according to claim 3, characterized in that, The valve cover (8) is fixed to the valve body (1) by bolts.

5. A nested high temperature dust tight ball valve according to claim 4, wherein, The valve stem (2) is provided with an upper cover (12) on the outside of the valve body (1), and a low-leakage packing (13) is provided between the upper cover (12) and the valve stem (2).

6. A low profile nested high temperature dust tight ball valve according to claim 5, wherein, The top cover (12) is fixed to the valve body (1) by bolts.

7. A lower-mounted nested high-temperature dust-proof ball valve according to claim 6, characterized in that, The ball (3) and the valve seat (6) are welded together with hard alloy.

8. A bottom-mounted nested high-temperature dustproof ball valve according to claim 7, characterized in that, The valve stem (2) is provided with an anti-blowout structure.

9. A lower-mounted nested high-temperature dust-proof ball valve according to claim 8, characterized in that, The anti-blowout structure is a limiting boss (14), which is located at the lower part of the valve stem (2) and inside the valve body (1) cavity.

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