Flange stop valve

Abstract

The utility model discloses a flange stop valve, including flange stop valve body, the upper end of flange stop valve body is equipped with the valve cover, the middle part of valve cover is connected with the valve stem of vertical sliding, the lower extreme of valve stem is equipped with the valve flap, the upper surface of valve cover is equipped with the prop respectively, the upper extreme between two props is equipped with the valve stem nut, and the valve stem nut is connected with the valve stem screw thread still, including positioning mechanism, positioning mechanism: it includes sleeve, knock ring, limit plate and top ring, the outer camber of sleeve sets up in the valve stem, and the outer camber of sleeve is connected with the knock ring of elastic limit vertical sliding, this flange stop valve, utilize elastic component to push knock the version and move to the knock of valve flap after closing position, and the voice prompt operator in time stops the rotation to valve stem through the knock, avoids the valve flap and sealing component damage caused by valve stem excessive rotation, improves the service life of flange stop valve.

Description

Technical Field

[0001] This utility model relates to the field of flange gate valve technology, specifically a flange gate valve. Background Technology

[0002] Flanged gate valves are a common type of gate valve, widely used in various pipeline systems. Based on the sealing fit between the valve disc and the valve seat, when the valve is closed, the valve disc is pressed tightly against the valve seat by the valve stem, blocking the flow of fluid in the pipeline and achieving a sealing and shut-off function. When the valve needs to be opened, rotating the valve stem causes the valve disc to move upward, creating a gap between the valve disc and the valve seat. Fluid can then flow through this gap, allowing the flow of fluid in the pipeline. The prior art, authorized by publication number CN 218326487, relates to this technology. U proposes a flanged gate valve, including a valve body with an inlet pipe and a drain pipe connected to both sides of the valve body. An installation flange is fixedly installed at the end of each inlet and drain pipe furthest from the valve body. A valve seat is fixedly connected to the top of the valve body via a connecting assembly. Support plates are fixedly installed on both sides of the top of the valve seat, and a connecting rod is provided between the two sets of support plates. The connecting rod has a polygonal cross-section. Although this design can cut off fluid flow in the experimental pipeline, the valve stem rotation during operation relies heavily on manual operation, which can easily lead to over-rotation, damaging the valve disc and sealing components, and affecting the service life of the flanged gate valve. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the existing defects and provide a flange gate valve that uses an elastic component to push a striking plate to strike the valve disc after it has moved to the closed position. The sound produced by the striking prompts the operator to stop rotating the valve stem in time, avoiding damage to the valve disc and sealing components due to excessive rotation of the valve stem, thereby improving the service life of the flange gate valve and effectively solving the problems in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a flange stop valve, comprising a flange stop valve body, a valve cover at the upper end of the flange stop valve body, a valve stem vertically slidably connected to the middle of the valve cover, a valve disc at the lower end of the valve stem, a support column on the upper surface of the valve cover, a valve stem nut between the upper ends of the two support columns, the valve stem nut being threadedly connected to the valve stem, and a positioning mechanism.

[0005] Positioning mechanism: It includes a sleeve, a striking ring, a limiting plate, and a top ring. The sleeve is set on the outer arc surface of the valve stem. The outer arc surface of the sleeve is vertically slidably connected to the striking ring with elastic limiting. The lower end of the outer arc surface of the sleeve is provided with a top ring. The limiting plates with elastic limiting are slidably connected to the lower end of the support column. The striking ring and the top ring are installed in cooperation with the limiting plates. The striking plate is pushed by the elastic component to strike after the valve disc moves to the closed position. The sound generated by the striking prompts the operator to stop rotating the valve stem in time, avoiding excessive rotation of the valve stem that may damage the valve disc and sealing components, and improving the service life of the flange gate valve.

[0006] Furthermore, the limiting plate is a U-shaped plate. The distance from the upper horizontal plate of the limiting plate to the central axis of the valve stem is greater than the outer diameter of the top ring and less than the outer diameter of the striking ring. The distance from the lower horizontal plate of the limiting plate to the central axis of the valve stem is less than the outer diameter of the top ring, which facilitates the limiting plate to limit the striking ring.

[0007] Furthermore, the upper and lower ends of the outer arc surface of the top ring, the upper end of the outer arc surface of the striking ring, and the end of the two horizontal plates of the limiting plate near the valve stem are all rounded, which facilitates the striking ring and the top ring to apply force to the limiting plate and push the limiting plate to move.

[0008] Furthermore, the positioning mechanism also includes a limiting ring and a spring. The limiting ring is disposed on the upper end of the outer arc surface of the sleeve, and a spring is provided between the limiting ring and the striking ring. The spring is movably sleeved on the outer arc surface of the sleeve to provide elastic limiting for the striking ring.

[0009] Furthermore, the positioning mechanism also includes guide posts and springs. The guide posts are respectively disposed at the lower end of the support column and are slidably connected to the guide holes on the surface of the vertical plate of the limiting plate. Springs are respectively movably sleeved on the outer arc surface of the guide posts. The end of the springs near the valve stem is respectively fixedly connected to the adjacent vertical plate of the limiting plate to provide elastic limiting for the limiting plate.

[0010] Furthermore, the end of the guide post away from the valve stem passes through the guide transverse hole at the lower end of the outer arc surface of the support column and is threaded with a nut. A pad is slidably connected between the outer arc surfaces of the two guide posts corresponding to the vertical position. The pad is located between the nut and the outer arc surface of the support column, which facilitates the replacement of the second spring.

[0011] Furthermore, the upper end of the outer arc surface of the valve stem is provided with an external threaded ring, which is connected to the internal thread of the valve stem nut. Both the upper and lower surfaces of the valve stem nut are provided with sealing rings to conceal the threaded connection of the valve stem.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: This flange gate valve has the following advantages:

[0013] The valve disc is moved to the closed position by a flexible component and a striking plate is pushed to strike it. The sound produced by the striking prompts the operator to stop rotating the valve stem in time, so as to avoid damage to the valve disc and sealing components due to excessive rotation of the valve stem, and to improve the service life of the flange gate valve. Attached Figure Description

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

[0015] Figure 2 This is a front view of the overall device of this utility model;

[0016] Figure 3 This is an enlarged structural diagram of point A in this utility model;

[0017] Figure 4 This is a partial structural schematic diagram of the positioning mechanism of this utility model;

[0018] Figure 5 This is a structural schematic diagram of the valve stem nut of this utility model, viewed from the front.

[0019] In the diagram: 1. Flange stop valve body, 2. Valve cover, 3. Valve stem, 4. Valve stem nut, 5. Positioning mechanism, 51. Sleeve, 52. Knocking ring, 53. Limiting plate, 54. Top ring, 55. Limiting ring, 56. Spring 1, 57. Guide post, 58. Spring 2, 6. Nut, 7. Washer plate, 8. Support column, 9. Sealing ring, 10. External threaded ring. Detailed Implementation

[0020] 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.

[0021] Please see Figure 1-5This embodiment provides a technical solution: a flange stop valve, including a flange stop valve body 1, with flanges at both ends of the flange stop valve body 1 to facilitate connection between the flange stop valve body 1 and external pipelines. A valve seat is provided in the middle of the flange stop valve body 1, and a valve cover 2 is provided at the upper end of the flange stop valve body 1. A valve stem 3 is vertically slidably connected to the middle of the valve cover 2, and a valve disc is provided at the lower end of the valve stem 3. Supports 8 are provided on the upper surface of the valve cover 2, and a valve stem nut 4 is provided between the upper ends of the two support supports 8. The valve stem nut 4 is threadedly connected to the valve stem 3. Rotating the valve stem 3 causes the valve disc at its lower end to move up and down through the threaded connection between the valve stem 3 and the valve stem nut 4. When the valve disc is tightly fitted with the sealing surface of the valve seat of the flange stop valve body 1, the flow of the medium inside the flange stop valve body 1 is cut off. When the valve disc leaves the valve seat, the fluid flows inside the flange stop valve body 1 through the flow hole in the middle of the valve seat. The valve stop valve body 1 also includes a positioning mechanism 5.

[0022] Positioning mechanism 5 includes a sleeve 51, a striking ring 52, a limiting plate 53, and a top ring 54. The sleeve 51 is located on the outer arc surface of the valve stem 3. A screw is inserted into the insertion hole on the outer arc surface of the sleeve 51, and the screw is threadedly connected to the screw hole on the outer arc surface of the valve stem 3 for easy replacement of the elastic component. The striking ring 52, which provides elastic limiting, is vertically slidably connected to the outer arc surface of the sleeve 51. The top ring 54 is located at the lower end of the outer arc surface of the sleeve 51. The limiting plate 53, which provides elastic limiting, is horizontally slidably connected to the lower end of the support column 8. Both the striking ring 52 and the top ring 54 are installed in conjunction with the limiting plate 53. The limiting plate 53 is a U-shaped plate. The distance from the upper horizontal plate of the limiting plate 53 to the central axis of the valve stem 3 is greater than the outer diameter of the top ring 54 and less than the outer diameter of the striking ring 52. The distance from the lower horizontal plate of the limiting plate 53 to the valve stem 3 is... The distance between the central axes of rod 3 is less than the outer diameter of top ring 54. The upper and lower ends of the outer arc surface of top ring 54, the upper end of the outer arc surface of striking ring 52, and the ends of the two horizontal plates of limiting plate 53 near valve stem 3 are all rounded to facilitate the striking ring 52 and top ring 54 to apply force to limiting plate 53 and push limiting plate 53 to move laterally. The positioning mechanism 5 also includes limiting ring 55 and spring 56. Limiting ring 55 is set on the upper end of the outer arc surface of sleeve 51. Spring 56 is provided between limiting ring 55 and striking ring 52. Spring 56 is movably sleeved on the outer arc surface of sleeve 51. The positioning mechanism 5 also includes guide post 57 and spring 58. Guide post 57 is respectively set at the lower end of support column 8. Guide post 57 is respectively aligned with the surface of vertical plate of limiting plate 53. The guide hole is slidably connected, and spring 58 is movably sleeved on the outer arc surface of guide post 57. The end of spring 58 near valve stem 3 is fixedly connected to the adjacent vertical plate of limiting plate 53. During the downward movement of valve stem 3, valve stem 3 drives sleeve 51 to move downward together. Due to the influence of the distance between limiting plate 53 and the central axis of valve stem 3, the outer diameter of striking ring 52 and the outer diameter of top ring 54, top ring 54 will not contact the upper horizontal plate of limiting plate 53 during the downward movement, while striking ring 52 will contact the upper horizontal plate of limiting plate 53 during the downward movement. As sleeve 51 moves downward, it will overcome the elastic force of spring 56 and push striking ring 52 to slide relative to sleeve 51. Because the lead of valve stem 3 is constant, when valve stem 3 drives valve disc to move downward to the designated closed position, top ring 54 will move downward. Ring 54 contacts the lower horizontal plate of the limiting plate 53 and applies force to it, overcoming the elastic force of spring 58. This pushes the limiting plate 53 and guide post 57 to slide relative to each other, causing the upper horizontal plate of the limiting plate 53 to move away from the valve stem 3. This cancels the limiting of the striking ring 52. At this time, under the elastic force of spring 56, the striking ring 52 quickly resets and strikes the top ring 54. The sound produced by the striking indicates to the operator that the valve disc movement is complete, stopping the rotation of the valve stem 3 and preventing damage to the sealing components from excessive rotation of the valve stem 3. When the flange gate valve is opened, the top ring 54 and the striking ring 52 move upward. The arc surface at the upper end of the striking ring 52 applies force to the upper horizontal plate of the limiting plate 53, pushing the limiting plate 53 to move aside, thus resetting the striking ring 52 and the top ring 54.The end of the guide post 57 furthest from the valve stem 3 passes through the guide transverse hole at the lower end of the outer arc surface of the support post 8 and is threadedly connected to a nut 6. The support post 8 is located between the ring on the outer arc surface of the guide post 57 and the nut 6. A pad 7 is laterally slidably connected between the outer arc surfaces of the two vertically positioned guide posts 57. The pad 7 is located between the nut 6 and the outer arc surface of the support post 8. With the support of the pad 7, the nut 6 and the outer arc surface of the support post 8 fit more tightly, facilitating the replacement of the second spring 58. An external threaded ring 10 is provided at the upper end of the outer arc surface of the valve stem 3, and the external threaded ring 10 is internally threaded to the valve stem nut 4. Sealing rings 9 are provided on both the upper and lower surfaces of the valve stem nut 4 to conceal the threaded connection of the valve stem 3 and reduce corrosion of the threaded connection of the valve stem 3 by the external environment over long-term use.

[0023] The working principle of the flange stop valve provided by this utility model is as follows: In use, the valve stem 3 is rotated by the handwheel at the upper end of the valve stem 3. The valve stem 3 is connected to the valve stem nut 4 via the threaded connection of the external threaded ring 10, causing the valve stem 3 to move the valve disc at its lower end up and down. When the valve disc is tightly fitted with the sealing surface of the valve seat of the flange stop valve body 1, the flow of the medium inside the flange stop valve body 1 is cut off. When the valve disc leaves the valve seat, the fluid flows through the flow hole in the middle of the valve seat inside the flange stop valve body 1. During the downward movement of the valve stem 3, the valve stem 3 drives the sleeve 51 to move downward together. Due to the influence of the distance between the limiting plate 53 and the central axis of the valve stem 3, the outer diameter of the striking ring 52, and the outer diameter of the top ring 54, the top ring 54 will not contact the upper horizontal plate of the limiting plate 53 during the downward movement, while the striking ring 52 will contact the upper horizontal plate of the limiting plate 53 during the downward movement. As the sleeve 51 moves downward, it will overcome the elastic force of the spring 56 and push... The striking ring 52 slides relative to the sleeve 51. Because the lead of the valve stem 3 is constant, when the valve stem 3 moves the valve disc down to the designated closed position, the top ring 54 will contact the lower horizontal plate of the limiting plate 53 and apply force to it, overcoming the elastic force of the second spring 58, pushing the limiting plate 53 and the guide post 57 to slide relative to each other, so that the upper horizontal plate of the limiting plate 53 moves away from the valve stem 3, canceling the limiting of the striking ring 52. At this time, under the elastic force of the first spring 56, the striking ring 52 quickly resets and strikes the top ring 54. The sound produced by the strike indicates to the operator that the valve disc movement is complete, stopping the rotation of the valve stem 3, and avoiding damage to the sealing components due to excessive rotation of the valve stem 3. When the flange gate valve is opened, the top ring 54 and the striking ring 52 move upward, using the arc surface at the upper end of the striking ring 52 to apply force to the upper horizontal plate of the limiting plate 53, pushing the limiting plate 53 to make way, realizing the reset of the striking ring 52 and the top ring 54.

[0024] The above are merely embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A flange stop valve, comprising a flange stop valve body (1), wherein a valve cover (2) is provided at the upper end of the flange stop valve body (1), a valve stem (3) is vertically slidably connected to the middle of the valve cover (2), a valve disc is provided at the lower end of the valve stem (3), and a support column (8) is provided on the upper surface of the valve cover (2), a valve stem nut (4) is provided between the upper ends of the two support columns (8), and the valve stem nut (4) is threadedly connected to the valve stem (3), characterized in that: It also includes a positioning mechanism (5); Positioning mechanism (5): It includes a sleeve (51), a striking ring (52), a limiting plate (53) and a top ring (54). The sleeve (51) is set on the outer arc surface of the valve stem (3). The outer arc surface of the sleeve (51) is vertically slidably connected to the striking ring (52) with elastic limiting. The lower end of the outer arc surface of the sleeve (51) is provided with a top ring (54). The limiting plate (53) with elastic limiting is slidably connected to the lower end of the support column (8) respectively. The striking ring (52) and the top ring (54) are both installed in cooperation with the limiting plate (53).

2. A flange gate valve according to claim 1, characterized in that: The limiting plate (53) is a U-shaped plate. The distance from the upper horizontal plate of the limiting plate (53) to the central axis of the valve stem (3) is greater than the outer diameter of the top ring (54) and less than the outer diameter of the striking ring (52). The distance from the lower horizontal plate of the limiting plate (53) to the central axis of the valve stem (3) is less than the outer diameter of the top ring (54).

3. A flange gate valve according to claim 1, characterized in that: The top and bottom ends of the outer arc surface of the top ring (54), the top end of the outer arc surface of the striking ring (52), and the end of the two horizontal plates of the limiting plate (53) near the valve stem (3) are all rounded.

4. A flange gate valve according to claim 1, characterized in that: The positioning mechanism (5) further includes a limiting ring (55) and a spring (56). The limiting ring (55) is located on the upper end of the outer arc surface of the sleeve (51), and a spring (56) is provided between the limiting ring (55) and the striking ring (52). The spring (56) is movably sleeved on the outer arc surface of the sleeve (51).

5. A flange gate valve according to claim 1, characterized in that: The positioning mechanism (5) further includes a guide post (57) and a second spring (58). The guide post (57) is respectively set at the lower end of the support column (8). The guide post (57) is slidably connected to the guide hole on the surface of the vertical plate of the limiting plate (53). The second spring (58) is movably sleeved on the outer arc surface of the guide post (57). The end of the second spring (58) near the valve stem (3) is fixedly connected to the adjacent vertical plate of the limiting plate (53).

6. A flange gate valve according to claim 5, characterized in that: The end of the guide post (57) away from the valve stem (3) passes through the guide transverse hole at the lower end of the outer arc surface of the support column (8) and is threaded with a nut (6). The two guide posts (57) in the vertical position are slidably connected with a pad (7) between their outer arc surfaces. The pad (7) is located between the nut (6) and the outer arc surface of the support column (8).

7. A flange gate valve according to claim 1, characterized in that: The upper end of the outer arc surface of the valve stem (3) is provided with an external threaded ring (10), which is connected to the internal thread of the valve stem nut (4). Both the upper and lower surfaces of the valve stem nut (4) are provided with sealing rings (9).

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