Ball valve with valve rod blow-out prevention structure

Abstract

A ball valve with a valve rod blow-out prevention structure comprises a valve body, a valve ball and a valve rod, a valve cavity is formed in the valve body, the valve ball is arranged in the valve cavity, one end of the valve rod extends into the valve cavity to be connected with the valve ball, a valve rod gland is arranged on the valve body, a valve rod positioning end is arranged on the valve rod gland, and the valve rod positioning end is connected with the valve rod. The valve rod is provided with a valve rod pressing part corresponding to the valve rod positioning end, the valve rod positioning end presses the valve rod pressing part to limit the upper position and the lower position of the valve rod in the valve body, and the valve rod pressing cover is provided with the valve rod positioning end used for pressing the valve cover pressing part, so that the valve rod can be effectively prevented from being accidentally blown out of the valve body under the high-pressure or abnormal working condition; and the overall stability and safety of the ball valve are enhanced.

Description

Technical Field

[0001] This utility model relates to the field of ball valve technology, and specifically to a ball valve with a stem anti-blowout structure. Background Technology

[0002] In existing technologies, ball valves, as key components of fluid control, are widely used in various fields such as petroleum, chemical, water treatment, and construction. Under conditions of high pressure, high temperature, or when the fluid contains corrosive substances, the sealing performance and structural stability of ball valves are particularly important. However, traditional ball valves often experience a series of problems during long-term use due to unreasonable valve stem design, such as valve stem loosening and blow-out, which in turn affects the overall sealing effect and safety of the ball valve. Summary of the Invention

[0003] In view of this, the present invention provides a ball valve with a stem anti-blowout structure.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A ball valve with a stem anti-blowout structure includes a valve body, a valve ball, and a valve stem. A valve cavity is formed within the valve body, and the valve ball is disposed within the valve cavity. One end of the valve stem extends into the valve cavity and connects to the valve ball. A valve stem cap is disposed on the valve body, and a valve stem positioning end is disposed on the valve stem cap. A valve stem pressing part is disposed on the valve stem corresponding to the valve stem positioning end. The valve stem positioning end presses against the valve stem pressing part to limit the vertical position of the valve stem within the valve body.

[0006] Preferably, the top of the valve body protrudes to form a valve stem guide end, and a guide groove communicating with the valve cavity is formed on the valve stem guide end. One end of the valve stem passes through the guide groove and extends into the valve cavity to connect with the valve ball. The valve stem gland is disposed on the valve stem guide end. The valve stem gland has a body part, a valve body connecting part, and an upper sealing part. The valve body connecting part is disposed on the bottom end of the body part away from the valve stem central axis. The valve body connecting part is fixedly connected to the valve stem guide end. The valve stem positioning end is formed by protruding from the bottom end of the body part near the valve stem central axis, and the valve stem positioning end extends toward the valve stem pressing part and presses against the valve stem pressing part.

[0007] Preferably, the valve stem has a connecting end and a driving end, the driving end being formed by protruding from the top center of the connecting end, the outer diameter of the connecting end being larger than the outer diameter of the driving end, the connecting end and the driving end forming a stepped structure, and the valve stem pressing part being a horizontal stepped surface on the stepped structure.

[0008] Preferably, the upper sealing part is formed by protruding from the top of the body part toward the valve stem, and a sealing groove is formed between the upper sealing part, the body part, and the valve stem pressing part. The valve stem passes through the sealing groove and extends into the valve cavity, and a sealing packing is provided between the part of the valve stem located in the sealing groove and the groove wall of the sealing groove.

[0009] Preferably, an annular groove is formed between the valve stem positioning end and the valve stem, and an annular wear-resistant plate is provided in the annular groove.

[0010] Preferably, the valve body includes a left valve body and a right valve body, which are welded together and fixed together, and the valve stem guide end protrudes from the top of the right valve body.

[0011] Preferably, valve body sealing grooves and valve stem sealing grooves are respectively provided on the groove wall of the guide groove and the portion of the valve stem located in the guide groove. Several valve body sealing grooves and valve stem sealing grooves are provided at equal intervals, and the valve body sealing grooves and valve stem sealing grooves are arranged alternately.

[0012] The beneficial effects of this utility model are as follows: by setting a valve stem positioning end on the valve stem gland for pressing the valve cover crimping part, it can effectively prevent the valve stem from being accidentally blown out of the valve body under high pressure or abnormal working conditions, thereby enhancing the overall stability and safety of the ball valve. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Appendix Figure 1 This is a schematic diagram of a ball valve structure;

[0015] Appendix Figure 2 For the appendix Figure 1 Enlarged view of point A in the middle. 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. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] The present invention will now be further described with reference to the accompanying drawings.

[0018] This utility model provides the following technical solution:

[0019] As attached Figure 1-2As shown, this utility model discloses a ball valve with a stem anti-blowout structure, including a valve body 1, a valve ball 2, and a valve stem 3. A valve cavity 4 is formed within the valve body 1, and the valve ball 2 is disposed within the valve cavity 4. One end of the valve stem 3 extends into the valve cavity 4 and connects to the valve ball 2. A valve stem cap 5 is provided on the valve body 1, and a valve stem positioning end 6 is provided on the valve stem cap 5. A valve stem pressing part 7 is provided on the valve stem 3 corresponding to the valve stem positioning end 6. The valve stem positioning end 6 presses against the valve stem pressing part 7 to limit the vertical position of the valve stem 3 within the valve body 1. Specifically, in this design, by providing the valve stem positioning end 6 on the valve stem cap 5 for pressing the valve cap pressing part, it is possible to effectively prevent the valve stem 3 from being accidentally blown out of the valve body 1 under high pressure or abnormal operating conditions, thereby enhancing the overall stability and safety of the ball valve.

[0020] Furthermore, a valve stem guide end 8 protrudes from the top of the valve body 1. A guide groove 9 communicating with the valve cavity 4 is formed on the valve stem guide end 8. One end of the valve stem 3 passes through the guide groove 9 and extends into the valve cavity 4 to connect with the valve ball 2. A valve stem cap 5 is disposed on the valve stem guide end 8. The valve stem cap 5 has a body part 10, a valve body connecting part 11, and an upper sealing part 12. The valve body connecting part 11 is disposed on the bottom end of the body part 10 away from the central axis of the valve stem 3. The valve body connecting part 11 is fixedly connected to the valve stem guide end 8. A valve stem positioning end 6 protrudes from the bottom end of the body part 10 near the central axis of the valve stem 3, and the valve stem positioning end 6 extends toward the valve stem pressing part 7 and presses against the valve stem pressing part 7. Specifically, in this embodiment, the design of the valve stem guide end 8 not only provides precise guidance for the valve stem 3, ensuring its smooth and stable movement during opening and closing, but also optimizes the sealing performance between the valve stem 3 and the valve body 1 through the opening of the guide groove 9. The precise dimensions and shape of the guide groove 9, which fits tightly with the valve stem 3, effectively reduces the risk of media leakage and enhances the sealing reliability of the ball valve. The body 10, as the main body of the valve stem gland 5, bears the primary load-bearing and clamping functions. The valve body connection 11 is located on the side away from the central axis of the valve stem 3. This layout not only reduces interference with the movement of the valve stem 3 but also enhances the connection strength between the valve stem gland 5 and the valve body 1, making the entire structure more stable. The upper sealing part 12 further improves the sealing effect between the valve stem gland 5 and the valve stem guide end 8, preventing media from penetrating through tiny gaps and ensuring the sealing performance of the ball valve.

[0021] Furthermore, the valve stem 3 has a connecting end 13 and a transmission end 14. The connecting end 13 is connected to the valve ball 2, and the transmission end 14 is connected to the power mechanism 15 at the top of the valve stem 3. The transmission end 14 is formed by protruding from the center of the top of the connecting end 13. The outer diameter of the connecting end 13 is larger than the outer diameter of the transmission end 14. The connecting end 13 and the transmission end 14 form a stepped structure, and the valve stem pressing part 7 is a horizontal stepped surface on the stepped structure. Specifically, in this embodiment, the stable connection between the connecting end 13 and the valve ball 2 ensures the precise control and sealing effect of the valve ball 2 in the valve cavity 4. Its larger outer diameter not only enhances the contact area with the valve ball 2 but also improves the firmness of the connection, reducing the risk of loosening caused by fluctuations in medium pressure. The design of the transmission end 14 optimizes the connection with the top power mechanism 15. Its smaller outer diameter reduces friction with the valve stem guide end 8 and the valve stem cap 5, making the rotation of the valve stem 3 smoother and reducing operating resistance. The horizontal stepped surface on the stepped structure serves as the valve stem pressing part 7. Its flat surface not only facilitates the pressing of the valve stem positioning end 6, but also improves the contact tightness between the two, effectively preventing the valve stem 3 from axial movement under high pressure or abnormal working conditions.

[0022] Furthermore, the upper sealing part 12 protrudes from the top of the body part 10 toward the valve stem 3. A sealing groove 16 is formed between the upper sealing part 12, the body part 10, and the valve stem pressing part 7. The valve stem 3 passes through the sealing groove 16 and extends into the valve cavity 4. A sealing packing 17 is provided between the portion of the valve stem 3 located in the sealing groove 16 and the groove wall of the sealing groove 16. Specifically, in this embodiment, the structure protruding toward the valve stem 3, together with the body part 10 and the valve stem pressing part 7, constitutes a precision sealing groove 16. The high-performance sealing packing 17 filled in the sealing groove 16, such as polytetrafluoroethylene or graphite, has excellent corrosion resistance, high temperature resistance, and good sealing performance. It can maintain a stable sealing effect under extreme working conditions, effectively prevent media leakage, and improve the overall sealing performance and service life of the ball valve.

[0023] Furthermore, an annular groove 18 is formed between the valve stem positioning end 6 and the valve stem 3, and an annular wear-resistant plate 19 is disposed within the annular groove 18. Specifically, in this embodiment, the annular wear-resistant plate 19 is typically made of a high-strength, high-wear-resistant material, such as hard alloy or special ceramic, which can effectively reduce the direct contact and friction between the valve stem 3 and the valve stem positioning end 6 during frequent movement, thereby avoiding positioning failure caused by long-term wear.

[0024] Furthermore, the valve body 1 includes a left valve body 20 and a right valve body 21, which are welded and fixed together, and the valve stem guide end 8 protrudes from the top of the right valve body 21.

[0025] Furthermore, valve body sealing grooves 22 and valve stem sealing grooves 23 are respectively formed on the groove wall of the guide groove 9 and the portion of the valve stem 3 located within the guide groove 9. Several valve body sealing grooves 22 and valve stem sealing grooves 23 are evenly spaced and are staggered. Specifically, in this embodiment, by forming staggered valve body sealing grooves 22 and valve stem sealing grooves 23 on the groove wall of the guide groove 9 and corresponding portions of the valve stem 3, and filling them with appropriate sealing materials, such as O-rings or elastic gaskets, the sealing effect between the valve stem 3 and the valve body 1 is further enhanced. This staggered arrangement design not only increases the number of sealing layers but also effectively reduces the risk of media penetration through the multiple sealing structure, ensuring that the sealing performance of the ball valve remains unaffected even under extreme conditions such as high pressure or high temperature.

[0026] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A ball valve with a stem anti-blowout structure, comprising a valve body, a valve ball, and a valve stem, wherein a valve cavity is formed within the valve body, the valve ball is disposed within the valve cavity, and one end of the valve stem extends into the valve cavity and connects to the valve ball, characterized in that: A valve stem cover is provided on the valve body, and a valve stem positioning end is provided on the valve stem cover. A valve stem pressing part is provided on the valve stem corresponding to the valve stem positioning end. The valve stem positioning end presses against the valve stem pressing part to limit the vertical position of the valve stem within the valve body.

2. The ball valve with a stem anti-blowout structure according to claim 1, characterized in that: The valve body has a protruding top end forming a valve stem guide end. A guide groove communicating with the valve cavity is formed on the valve stem guide end. One end of the valve stem passes through the guide groove and extends into the valve cavity to connect with the valve ball. A valve stem cap is set on the valve stem guide end. The valve stem cap has a body part, a valve body connecting part, and an upper sealing part. The valve body connecting part is located on the bottom end of the body part away from the valve stem central axis. The valve body connecting part is fixedly connected to the valve stem guide end. The valve stem positioning end is formed by protruding from the bottom end of the body part near the valve stem central axis, and the valve stem positioning end extends toward the valve stem pressing part and presses against the valve stem pressing part.

3. The ball valve with a stem anti-blowout structure according to claim 2, characterized in that: The valve stem has a connecting end and a driving end. The driving end is formed by protruding from the center of the top of the connecting end. The outer diameter of the connecting end is larger than the outer diameter of the driving end. The connecting end and the driving end form a stepped structure. The valve stem pressing part is a horizontal stepped surface on the stepped structure.

4. The ball valve with a stem anti-blowout structure according to claim 2, characterized in that: The upper sealing part is formed by protruding from the top of the body part toward the valve stem. A sealing groove is formed between the upper sealing part, the body part, and the valve stem pressing part. The valve stem passes through the sealing groove and extends into the valve cavity. Sealing packing is provided between the part of the valve stem located in the sealing groove and the groove wall of the sealing groove.

5. The ball valve with a stem anti-blowout structure according to claim 1, characterized in that: An annular groove is formed between the valve stem positioning end and the valve stem, and an annular wear-resistant plate is provided in the annular groove.

6. The ball valve with a stem anti-blowout structure according to claim 2, characterized in that: The valve body includes a left valve body and a right valve body, which are welded and fixed together, and the valve stem guide end protrudes from the top of the right valve body.

7. The ball valve with a stem anti-blowout structure according to claim 2, characterized in that: The guide groove wall and the portion of the valve stem located within the guide groove are respectively provided with valve body sealing groove and valve stem sealing groove. Several valve body sealing grooves and valve stem sealing grooves are provided at equal intervals, and the valve body sealing grooves and valve stem sealing grooves are arranged alternately.

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