Anti-stuck ball valve seat

Abstract

The utility model discloses a kind of anti-jamming ball valve seat, relate to ball valve technical field.The valve seat is set on the annular mounting seat of valve body, its sealing surface cooperates with ball core, and elastic member provides pre-tightening force.Its improvement is that: anti-shaking ring installation groove is set in valve seat outer peripheral wall, and anti-shaking ring is nested fixed in groove;Valve seat outer diameter is less than the first annular expansion compensation space formed by annular mounting seat inner diameter;Anti-shaking ring outer peripheral wall is attached with annular mounting seat inner peripheral wall, and the second annular expansion compensation space is formed between its inner peripheral wall and installation groove groove bottom;Anti-shaking ring is equipped with the sealing groove of embedded elastic sealing ring.This utility model restricts valve seat normality shaking by anti-shaking ring, absorbs high-temperature expansion using double annular expansion compensation space, effectively solve the technical problem that valve seat is anti-jamming and stable, especially applicable to high-temperature medium pipeline.

Description

Technical Field

[0001] This utility model relates to the field of ball valve technology, specifically to an anti-jamming ball valve seat, which is mainly used in industrial pipelines for high-temperature media. Background Technology

[0002] Ball valves, due to their rapid opening and closing and reliable sealing, have become a key component in the field of fluid control. To ensure sealing performance, these ball valves often employ a floating seat structure, and rely on spring preload to keep the seat pressed against the ball, thereby adapting to pressure fluctuations and wear compensation.

[0003] However, under high-temperature conditions, the valve seat material expands due to heat. If the fit between the valve seat and the mounting groove on the valve body is too tight, it is prone to jamming due to space constraints caused by volume expansion at high temperatures. Once jamming occurs, the valve seat will lose its radial floating ability, which not only prevents the spring preload from being effectively transmitted to the sealing surface and causes leakage, but also significantly increases the operating torque of the valve stem driving the ball rotation, and in severe cases, even causes the valve to fail to open and close normally. To alleviate valve seat jamming at high temperatures, the current common practice is to leave a certain fit clearance between the valve seat and the mounting groove. However, if this clearance is designed only to accommodate thermal expansion, it is difficult to ensure the stability of the valve seat under different operating conditions: when the clearance is insufficient, the high-temperature jamming problem still exists; when the clearance is too large, the valve seat is prone to radial wobbling under normal conditions, which not only disrupts the uniform contact of the sealing surface and affects the sealing effect, but may also cause uneven wear or even premature failure of the valve seat due to long-term vibration or fluid impact. Therefore, it is urgent to improve the existing technology to solve the balance problem between valve seat jamming due to thermal expansion and instability due to excessive clearance in high-temperature ball valves. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide an anti-jamming ball valve seat, solving the technical problems that the existing ball valve seat is prone to jamming due to thermal expansion at high temperatures and is prone to instability due to excessive clearance under normal conditions.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An anti-jamming ball valve seat includes a valve body, a ball core, a valve seat, and an elastic element. The valve body has an annular mounting seat on the side near the ball core, and the valve seat is mounted on the annular mounting seat. The valve seat has a sealing surface on the side near the ball core, which cooperates with the ball core to form a seal. One end of the elastic element abuts against the valve seat, and the other end abuts against the valve body to provide a preload force to the valve seat towards the ball core. An annular anti-sway ring mounting groove is formed on the outer peripheral wall of the valve seat, and an anti-sway ring is nested and fixed within the groove. The outer diameter of the valve seat is smaller than the inner diameter of the annular mounting seat, and a first annular expansion compensation space is formed between the outer peripheral wall of the valve seat and the inner peripheral wall of the annular mounting seat. The outer peripheral wall of the anti-sway ring fits against the inner peripheral wall of the annular mounting seat, and a gap exists between the inner peripheral wall of the anti-sway ring and the bottom of the anti-sway ring mounting groove, forming a second annular expansion compensation space. At least one sealing groove is provided on the anti-sway ring, and an elastic sealing ring is embedded within the sealing groove.

[0006] Furthermore, the sealing groove includes a first sealing groove formed on the inner peripheral wall of the anti-sway ring.

[0007] Furthermore, the sealing groove also includes a second sealing groove formed on the upper end face and / or lower end face of the anti-sway ring.

[0008] Preferably, the elastic element is a butterfly spring, which includes a first butterfly spring and a second butterfly spring; one end of the first butterfly spring abuts against the bottom of the valve seat and the other end abuts against the valve body; a protrusion is provided on the outer side of the valve seat, and one end of the second butterfly spring abuts against the valve body and the other end abuts against the protrusion.

[0009] Preferably, the anti-sloshing ring is made of a material with a coefficient of thermal expansion similar to that of the valve body.

[0010] The core of this utility model's anti-jamming ball valve seat lies in its ability to collaboratively solve the problems of high-temperature jamming and normal swaying by setting an anti-swaying ring and a double-annular expansion compensation space. Specifically, the valve seat forms a seal by pressing the ball core together with the pre-tightening force of an elastic element, and the anti-swaying ring is nested and fixed within the anti-swaying ring mounting groove opened on the outer peripheral wall of the valve seat; the outer diameter of the valve seat is smaller than the inner diameter of the annular mounting seat of the valve body to form a first annular expansion compensation space, and a second annular expansion compensation space is formed between the inner wall of the anti-swaying ring and the bottom of the mounting groove; a sealing groove and an elastic sealing ring are provided on the anti-swaying ring to ensure a seal.

[0011] Compared to existing technologies, this invention offers significant advantages: First, the first annular expansion compensation space provides a dedicated compensation volume for the radial expansion of the valve seat material at high temperatures, effectively preventing direct contact and compression between the outer wall of the valve seat and the inner wall of the valve body mounting groove, fundamentally preventing high-temperature jamming. Second, the outer peripheral wall of the anti-sway ring precisely matches the inner peripheral wall of the valve body mounting groove, while a second annular expansion compensation space is reserved between the anti-sway ring and the valve seat. This design not only uses the anti-sway ring to limit the radial sway of the valve seat under normal conditions, ensuring stable contact of the sealing surface, but also provides additional space for the expansion of the valve seat itself, ensuring that the valve seat will not jam even under extreme expansion. Finally, the elastic sealing ring on the anti-sway ring, especially the sealing groove structure located on the inner peripheral wall and end face, maintains a reliable static seal while allowing the valve seat to float, solving the leakage problem under large gaps. In addition, the use of double butterfly springs to provide multi-directional preload further enhances the stability and sealing follow-through of the valve seat. This invention significantly improves the reliability, sealing life, and ease of operation of the ball valve under high-temperature conditions through the synergistic effect of the above-mentioned structures. Attached Figure Description

[0012] Figure 1 A partial cross-sectional structural diagram of the anti-jamming ball valve seat provided by this utility model.

[0013] Figure 2 for Figure 1 A magnified view of a portion of region A in the middle.

[0014] Figure 3 for Figure 2 A partially enlarged schematic diagram of the anti-sway ring and valve seat in region B.

[0015] The attached icon numbers are as follows: 1. Valve body; 2. Ball core; 3. Valve seat; 31. Anti-sway ring mounting groove; 4. Elastic element; 41. First butterfly spring; 42. Second butterfly spring; 5. Anti-sway ring; 51. First sealing groove; 52. Second sealing groove; 6. First annular expansion compensation space; 7. Second annular expansion compensation space. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments 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 scope of protection of the present utility model.

[0017] In the description of this utility model, it should be noted that the terms "inner", "outer", "upper", "lower", "bottom", "top", 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.

[0018] Please refer to the following: Figures 1 to 3 This embodiment provides an anti-jamming ball valve seat, which mainly includes a valve body 1, a ball core 2, a valve seat 3, and an elastic element 4.

[0019] The valve body 1 is the main pressure-bearing component of the ball valve, and a fluid passage is formed inside it. The valve body 1 has an integrally formed or machined annular mounting seat (not shown separately in the figure) near the ball core 2. It is part of the structure of the valve body 1 and is used to install and position the valve seat 3.

[0020] The valve seat 3 is a key component for achieving ball valve sealing. It is typically made of non-metallic materials (such as PTFE, PEEK, etc.) with good sealing performance and a certain degree of elasticity. The valve seat 3 is mounted on an annular mounting seat of the valve body 1. The side of the valve seat 3 closest to the ball core 2 is machined with a precision sealing surface. This sealing surface mates with the spherical surface of the ball core 2. Under the preload provided by the elastic element 4, they tightly fit against the ball core 2, forming a dynamic sealing pair to ensure the valve's sealing performance when closed.

[0021] The elastic element 4 is installed between the valve seat 3 and the valve body 1. In this embodiment, the elastic element 4 is preferably a spring, specifically a butterfly spring. One end of the elastic element 4 abuts against the bottom of the valve seat 3, and the other end abuts against the corresponding support part of the valve body 1. The elastic element 4 is pre-compressed, thereby continuously applying a pre-tightening force towards the ball core 2 to the valve seat 3. This pre-tightening force has two main functions: first, to ensure the initial seal between the sealing surface of the valve seat 3 and the ball core 2 during the initial opening and closing of the valve or when the pressure is low; second, to push the valve seat 3 to float towards the ball core 2 to compensate for normal wear of the sealing surface of the valve seat 3, thus maintaining the sealing pressure.

[0022] To address the issues of valve seat 3 easily jamming at high temperatures and easily wobbling under normal conditions, this invention makes key improvements to the structure of valve seat 3. Specifically, an annular anti-sway ring mounting groove 31 is formed on the outer peripheral wall of valve seat 3. An anti-sway ring 5 is nested and fixedly installed within this anti-sway ring mounting groove 31. The anti-sway ring 5 is preferably made of a metal material (e.g., stainless steel) with a coefficient of thermal expansion similar to that of valve body 1 to ensure good dimensional stability at high temperatures and to coordinate with the deformation of valve body 1.

[0023] The outer diameter of the valve seat 3 is designed to be smaller than the inner diameter of the annular mounting seat on the valve body 1, resulting in a natural annular gap between the outer peripheral wall of the valve seat 3 and the inner peripheral wall of the annular mounting seat. This gap forms the first annular expansion compensation space 6. The main function of the first annular expansion compensation space 6 is to accommodate the radial thermal expansion of the valve seat 3 material at high temperatures. When the temperature rises, the valve seat 3 expands circumferentially, and its outer peripheral wall moves outward, thereby compressing the first annular expansion compensation space 6. Due to the existence of this space, the outer peripheral surface of the valve seat 3 will not make hard contact or be squeezed with the inner wall of the annular mounting seat of the valve body 1, thus effectively preventing the valve seat 3 from getting stuck in the mounting groove due to obstructed expansion.

[0024] Meanwhile, the outer peripheral wall of the anti-sway ring 5 precisely fits against the inner peripheral wall of the annular mounting seat of the valve body 1, providing radial positioning and guidance to limit excessive swaying of the valve seat 3. A gap is reserved between the inner peripheral wall of the anti-sway ring 5 and the bottom of the anti-sway ring mounting groove 31, forming a second annular expansion compensation space 7. The second annular expansion compensation space 7 also accommodates the expansion of the valve seat 3. Even if the valve seat 3 expands due to heat to the point that the second annular expansion compensation space 7 is partially or completely compressed, the continued expansion of the valve seat 3 material will act on the anti-sway ring 5 and begin to compress the second annular expansion compensation space 7. This dual expansion compensation design greatly improves the valve seat's anti-jamming capability, ensuring that the valve seat 3 maintains the necessary radial floating freedom even under high-temperature conditions.

[0025] It should be further explained that the gap of the second annular expansion compensation space 7 is smaller than that of the first annular expansion compensation space 6. Under normal operating conditions, due to the presence of the anti-sway ring 5, even if there is a natural annular gap between the outer peripheral wall of the valve seat 3 and the inner peripheral wall of the annular mounting seat, the valve seat 3 can only sway within the gap range of the second annular expansion compensation space 7, which greatly reduces the amplitude of the valve seat swaying.

[0026] To allow valve seat floating and compensating for expansion without sacrificing sealing performance, at least one sealing groove is provided on the anti-sway ring 5, within which an elastic sealing ring (such as an O-ring) is embedded. In a preferred embodiment, the sealing groove may include a first sealing groove 51 formed on the inner peripheral wall of the anti-sway ring 5, where the embedded first elastic sealing ring directly forms a dynamic seal with the outer peripheral wall of the annular mounting seat of the valve body 1. Further, the sealing groove may also include a second sealing groove 52 formed on the upper and / or lower end faces of the anti-sway ring 5, where the embedded second elastic sealing ring forms an end face seal with the corresponding end face of the anti-sway ring mounting groove 31. These elastic sealing rings effectively prevent fluid leakage along the assembly gap between the valve seat 3 and the valve body 1.

[0027] As a further optimization of this embodiment, the elastic element 4 can specifically be a butterfly spring assembly. The butterfly spring assembly includes a first butterfly spring 41 and a second butterfly spring 42. The first butterfly spring 41 is arranged axially, with one end abutting the bottom of the valve seat 3 and the other end abutting the valve body 1, providing the main axial preload. The second butterfly spring 42 is arranged axially, and a protrusion (not shown in the figure) is provided on the outer side of the valve seat 3. One end of the second butterfly spring 42 abuts the valve body 1, and the other end abuts the protrusion. This double butterfly spring structure can enhance the preload and stabilizing effect on the valve seat 3, further suppress the abnormal displacement and vibration of the valve seat 3, and improve its sealing stability and service life under complex working conditions.

[0028] The working principle of this utility model is briefly described as follows: At room temperature, the preload provided by the elastic element 4 (butterfly spring) ensures that the sealing surface of the valve seat 3 firmly presses against the ball core 2, forming an initial seal. At this time, the anti-sway ring 5, as the core radial positioning component, precisely fits its outer circumferential wall against the inner circumferential wall of the annular mounting seat of the valve body 1, greatly restricting the radial movement of the valve seat 3. Because the gap of the second annular expansion compensation space 7 is designed to be smaller than that of the first annular expansion compensation space 6, the radial sway of the valve seat 3 under normal conditions is strictly limited within the small gap range of the second annular expansion compensation space 7. This design effectively avoids problems such as valve seat instability and uneven wear of the sealing surface caused by excessive gaps, while ensuring that the valve seat can perform precise and minute floating compensation when subjected to fluid pressure fluctuations, maintaining uniform contact of the sealing surface and reliable sealing. The elastic sealing ring on the anti-sway ring 5 provides an effective static seal in this state, preventing media leakage.

[0029] Under high-temperature conditions, the material of valve seat 3 (such as PTFE) undergoes significant radial expansion upon heating. At this point, the advantage of the dual annular expansion compensation space becomes apparent: the expansion of valve seat 3 tends to fill and compress the first annular expansion compensation space 6 between itself and the valve body mounting groove. Due to the existence of this space, the outer peripheral wall of the expanded valve seat 3 will not immediately make hard contact with the inner wall of the annular mounting seat of valve body 1, thus avoiding direct jamming. Simultaneously, the increased temperature also causes the bottom of the anti-sway ring mounting groove 31 of valve seat 3 to expand, compressing the reserved second annular expansion compensation space 7. This process even allows the second annular expansion compensation space 7 to be completely compressed until the inner peripheral wall of the anti-sway ring 5 is completely fitted with the bottom of the anti-sway ring mounting groove 31. Even so, because the anti-sway ring 5 itself has a precise sliding fit rather than an interference fit with the valve body 1 mounting groove, the valve seat 3 as a whole can still maintain the necessary degree of freedom of movement in the radial direction without being completely jammed. During the entire heating and expansion process, the elastic sealing ring on the anti-sway ring 5 (such as the sealing ring in the first sealing groove 51) undergoes elastic deformation, continuously maintaining the dynamic sealing effect.

[0030] Therefore, this utility model solves the problems of high-temperature jamming and normal shaking through innovative anti-sloshing ring and double-ring expansion compensation space design, and realizes reliable sealing and stable operation of ball valve seat in a wide temperature range.

[0031] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A ball valve seat for preventing jamming, characterized in that, Includes valve body, ball core, valve seat, and elastic element; The valve body is provided with an annular mounting seat on the side near the ball core, and the valve seat is disposed on the annular mounting seat. The valve seat is provided with a sealing surface on the side near the ball core, and the sealing surface cooperates with the ball core to form a seal. One end of the elastic element abuts against the valve seat, and the other end abuts against the valve body to provide a preload force to the valve seat toward the ball core; An annular anti-sway ring mounting groove is provided on the outer peripheral wall of the valve seat, and an anti-sway ring is nested and fixed in the anti-sway ring mounting groove. The outer diameter of the valve seat is smaller than the inner diameter of the annular mounting base, and a first annular expansion compensation space is formed between the outer peripheral wall of the valve seat and the inner peripheral wall of the annular mounting base. The outer peripheral wall of the anti-sway ring is in contact with the inner peripheral wall of the annular mounting base, and there is a gap between the inner peripheral wall of the anti-sway ring and the bottom of the anti-sway ring mounting groove, forming a second annular expansion compensation space. The anti-sway ring is provided with at least one sealing groove, and an elastic sealing ring is embedded in the sealing groove.

2. The anti-jamming ball valve seat according to claim 1, characterized in that, The sealing groove includes a first sealing groove formed on the inner and outer peripheral walls of the anti-sway ring.

3. The anti-jamming ball valve seat according to claim 2, characterized in that, The sealing groove also includes a second sealing groove formed on the upper and / or lower end faces of the anti-sway ring.

4. A ball valve seat for preventing jamming according to any one of claims 1 to 3, characterized in that, The elastic element is a butterfly spring, which includes a first butterfly spring and a second butterfly spring; One end of the first butterfly spring abuts against the bottom of the valve seat, and the other end abuts against the valve body; The outer surface of the valve seat is provided with a protrusion, and one end of the second butterfly spring abuts against the valve body, while the other end abuts against the protrusion.

5. A ball valve seat for preventing jamming according to any one of claims 1 to 3, characterized in that, The anti-sloshing ring is made of a material with a coefficient of thermal expansion similar to that of the valve body.

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