Seal face structure stable stop valve

Abstract

The utility model discloses a sealing surface structure stable stop valve, its technical scheme main points are including valve body, the valve seat of being located in the valve body, the valve core that can form hard seal with valve seat and can drive the valve rod that moves up and down of valve core, the valve core includes with the core body that the valve rod is connected, can extend into the inner chamber of valve seat and forms the hard seal with the inner wall of valve seat the column body that will core body and platform body coaxial connection, and the diameter of column body is greater than or equal to the big end diameter of platform body and less than the end face diameter of core body, the end face of core body towards valve seat is provided with the annular groove that is coaxial with column body, is provided with spring, push ring and soft sealing ring that are successively set in the outer of column body in the annular groove, and spring and push ring all are limited in the annular groove, and the soft sealing ring partially extends outside the annular groove, and through spring promotes push ring and soft sealing ring whole to make soft sealing ring and valve seat closely adhere, has solved the problem that the sealing surface of prior art is easy to be worn and broken and causes the problem of not closing tightly.

Description

Technical Field

[0001] This utility model relates to the field of gate valve technology, and more specifically to a gate valve with a stable sealing surface structure. Background Technology

[0002] Gate valves are among the most widely used types of valves. They offer advantages such as low friction between the sealing surfaces during opening and closing, durability, small opening height, ease of manufacturing, and convenient maintenance. Therefore, these valves are well-suited for shut-off or regulation functions. While existing gate valves generally meet user needs, some problems remain. During the initial opening or near-closing process, the small gap between the valve core and seat, coupled with the high flow velocity of the medium between them, can easily erode the sealing surfaces, leading to damage. After repeated opening and closing, the seal between the valve core and seat deteriorates, causing leakage. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a shut-off valve that reduces wear between the valve core and the valve seat and provides stable sealing performance.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a gate valve with a stable sealing surface structure, comprising a valve body, a valve seat located within the valve body, a valve core capable of forming a hard seal with the valve seat, and a valve stem capable of driving the valve core to move up and down. The valve core includes a core body connected to the valve stem, a platform body capable of extending into the inner cavity of the valve seat and forming a hard seal with the inner wall of the valve seat, and a column body coaxially connected to the platform body. The diameter of the column body is greater than or equal to the large end diameter of the platform body and smaller than the end face diameter of the core body. An annular groove coaxial with the column body is provided on the end face of the core body facing the valve seat. A spring, a push ring, and a soft sealing ring are sequentially sleeved outside the column body in the annular groove. The spring and the push ring are both confined within the annular groove, and the soft sealing ring partially extends out of the annular groove. The spring pushes the push ring and the soft sealing ring together to make the soft sealing ring fit tightly against the valve seat.

[0005] As a further improvement of this utility model, the ring diameter of the push ring is adapted to the inner cavity width of the ring groove, and multiple notches distributed along the outer edge of the push ring are provided on the outer edge of the push ring.

[0006] The beneficial effects of this utility model are as follows: by using a spring to push the push ring and the soft sealing ring together, the soft sealing ring is tightly fitted to the valve seat. During the opening process, the soft sealing ring separates from the valve seat after the valve core separates from the valve seat. Compared with the prior art, this design can reduce the scouring force of the medium on the sealing structure of both the valve core and the valve seat during the opening process, thereby extending the service life of the valve core and the valve seat and improving the sealing stability between the valve core and the valve seat. Attached Figure Description

[0007] Figure 1 This is a front sectional view of the present invention; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 for Figure 2 A diagram showing the state when the valve seat is separated from the core and the soft sealing ring is in contact with the valve seat; Figure 4 for Figure 3 Diagram showing the state when both the core and the soft sealing ring are separated from the valve seat; Figure 5 for Figure 4 A diagram showing the state when the core body and valve seat are initially in contact, but the soft sealing ring is not yet in contact with the valve seat.

[0008] Reference numerals: 1. Valve body; 2. Valve seat; 3. Valve core; 31. Core; 32. Platform; 33. Column; 34. Annular groove; 35. Spring; 36. Push ring; 37. Soft sealing ring; 38. Notch; 4. Valve stem. Detailed Implementation

[0009] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Identical components are indicated by the same reference numerals.

[0010] Reference Figures 1 to 5 As shown, a shut-off valve with a stable sealing surface structure according to this embodiment includes a valve body 1, a valve seat 2 located inside the valve body 1, a valve core 3 that can form a hard seal with the valve seat 2, and a valve stem 4 that can drive the valve core 3 to move up and down. Based on the aforementioned prior art, the valve core 3 includes an integrally formed and coaxial core 31, a column 33, and a platform 32. The diameter of the core 31 is larger than the diameter of the column 33, and the diameter of the column 33 is greater than or equal to the diameter of the large end of the platform 32. Here, the diameter of the column 33 and the diameter of the large end of the platform 32 are designed to be the same. The inner wall of the valve seat 2 is beveled to form a frustum surface that can fit tightly against the peripheral wall of the platform 32. That is, the sealing surfaces of the platform 32 and the valve seat 2 are located on the peripheral wall of the platform 32 and the inner wall of the valve seat 2, respectively. A coaxial surface with the column 33 is machined on the end face where the core 31 connects to the column 33. The annular groove 34 has a smaller inner wall diameter that is the same as the diameter of the column 33. One end of the spring 35 can be coaxially welded to the push ring 36. The soft sealing ring 37 is attached to the other annular surface of the push ring 36. Then, the spring 35, the push ring 36 and the soft sealing ring 37 are installed into the annular groove 34 as a whole. The spring 35 is located between the bottom of the annular groove 34 and the push ring 36. Then, a ring-shaped cover plate with an inner diameter smaller than the outer diameter of the push ring 36 is bolted to the core 31. Then, the push ring 36 and the spring 35 are both confined within the annular groove 34. The inner diameter of the cover plate is larger than the outer diameter of the soft sealing ring 37. In the initial state, valve seat 2 is separated from valve core 3, the medium flows from bottom to top, spring 35 is in an extended state, push ring 36 is in contact with the top of cover plate, and soft sealing ring 37 extends to its maximum length outside cover plate; depending on the selection of spring coefficient 35, there are two situations, one of which is detailed in the reference section. Figure 2 , Figure 3 and Figure 4 As shown, since the spring 35 has a large elastic modulus and the medium pressure has no effect on the spring 35, during the linear movement of the valve core 3 towards the valve seat 2, as the distance between the peripheral wall of the platform 32 and the inner wall of the valve seat 2 gradually decreases, the medium pressure flowing between the soft sealing ring 37 and the valve seat 2 gradually increases. The spring 35 remains in an extended state until the soft sealing ring 37 is in contact with the end face of the valve seat 2 and there is a gap between the inner wall of the valve seat 2 and the outer wall of the platform 32. The medium is blocked and cannot flow, and the medium does not generate a scouring force on the platform 32 and the valve seat 2. As the valve core 3 continues to move, the soft sealing ring 37 undergoes elastic deformation, and the spring 35 is compressed. The sealing ring 37 gradually retracts into the annular groove 34 until the peripheral wall of the platform 32 and the inner wall of the valve seat 2 are fully fitted to form a hard seal. The valve core 3 stops moving. During the process of the valve core 3 moving away from the valve seat 2 in a straight line, the platform 32 separates from the valve seat 2 first, and the soft sealing ring 37 remains in contact with the valve seat 2 under the action of the spring 35. The medium is in a static state. As the valve core 3 continues to move away from the valve seat 2, the spring 35 and the soft sealing ring 37 return to their initial state one after another. The soft sealing ring 37 separates from the valve seat 2, and the medium flows from bottom to top again. At this time, the distance between the peripheral wall of the platform 32 and the valve seat 2 is large, and the scouring force of the medium is small. Secondly, refer to the specific details. Figures 2 to 5As shown, the spring 35 has a small elastic coefficient and the medium pressure has a large influence on the spring 35. Therefore, during the linear movement of the valve core 3 towards the valve seat 2, as the distance between the peripheral wall of the platform 32 and the inner wall of the valve seat 2 gradually decreases, the medium pressure flowing between the soft sealing ring 37 and the valve seat 2 gradually increases. The soft sealing ring 37 is pushed into the annular groove 34, and the spring 35 is compressed until the peripheral wall of the platform 32 and the inner wall of the valve seat 2 are fully fitted to form a hard seal. The valve core 3 stops moving. Because the medium is blocked, the spring 35 extends and pushes the soft sealing ring 37 to a position where it is tightly fitted to the valve seat 2. The soft sealing ring 37 undergoes elastic deformation. During the linear movement of the valve core 3 away from the valve seat 2, the platform 32 and the valve seat 2 separate first, and the soft sealing ring 37, under the action of the spring 35, follows... The valve core 3 is initially in contact with the valve seat 2. Because the soft sealing ring 37 is simultaneously in contact with both the column 33 and the valve seat 2, the medium cannot flow and remains stationary. As the valve core 3 continues to move away from the valve seat 2, the spring 35 and the soft sealing ring 37 return to their initial states one after another. The soft sealing ring 37 separates from the valve seat 2, and the medium flows from bottom to top again. At this time, the distance between the peripheral wall of the platform 32 and the valve seat 2 is large, and the scouring force of the medium is small. The two situations mentioned above each have their shortcomings. The former requires the output device to output an additional part of the power to overcome the elastic force generated by the spring 35 when closing, and at the same time, it requires high structural strength of the valve stem 4. The latter cannot reduce the scouring force of the medium on the sealing structure of both the valve core 3 and the valve seat 2 during the closing process. Users may choose the spring 35 according to actual needs. Compared with existing technologies, this design can reduce the scouring force of the medium on the sealing structure of valve core 3 and valve seat 2 during the opening process, thereby extending the service life of valve core 3 and valve seat 2 and improving the sealing stability between valve core 3 and valve seat 2. To further explain, if the spring 35, push ring 36, or soft sealing ring 37 is damaged, the cover plate can be removed and replaced to ensure the continued use of the valve core 3.

[0011] As one specific implementation method of the improvement, refer to Figures 2 to 5 As shown, the ring diameter of the push ring 36 is matched with the inner cavity width of the ring groove 34. This design can reduce the probability of tilting when the push ring 36 moves up and down, and ensure the connection stability of the push ring 36. Multiple notches 38 are provided on the outer edge of the push ring 36. This design can facilitate the flow of gas on the upper and lower sides of the push ring 36 during movement, and improve the smoothness of the push ring 36 movement.

[0012] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A gate valve with a stable sealing surface structure, comprising a valve body (1), a valve seat (2) located within the valve body (1), a valve core (3) capable of forming a hard seal with the valve seat (2), and a valve stem (4) capable of driving the valve core (3) to move up and down, characterized in that: The valve core (3) includes a core (31) connected to the valve stem (4), a platform (32) that extends into the inner cavity of the valve seat (2) and forms a hard seal with the inner wall of the valve seat (2), and a column (33) coaxially connecting the core (31) and the platform (32). The diameter of the column (33) is greater than or equal to the large end diameter of the platform (32) and smaller than the end face diameter of the core (31). The end face of the core (31) facing the valve seat (2) is provided with a part coaxial with the column (33). The annular groove (34) is provided with a spring (35), a push ring (36) and a soft sealing ring (37) sequentially sleeved on the outside of the column (33). The spring (35) and the push ring (36) are both confined within the annular groove (34). The soft sealing ring (37) extends partially out of the annular groove (34). The spring (35) pushes the push ring (36) and the soft sealing ring (37) together to make the soft sealing ring (37) fit tightly against the valve seat (2).

2. The shut-off valve with a stable sealing surface structure according to claim 1, characterized in that: The diameter of the push ring (36) is adapted to the inner cavity width of the ring groove (34), and a plurality of notches (38) are provided on the outer edge of the push ring (36) along the outer edge of the push ring (36).

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