An erosion resistant stop valve

Abstract

The utility model discloses an anti -scouring stop valve, its technical scheme main points are including valve body, the valve seat of being located in the valve body and can with the valve core of valve seat formation hard seal, the buffer ring is arranged in the valve seat inner chamber coaxially, is provided with a plurality of around the buffer ring axis distribution's guide vane on the buffer ring inner wall, a plurality of guide vanes are all relatively the end surface of buffer ring and are arranged obliquely, and the medium that flows upwards along the buffer ring inner wall is guided and changes the flow direction through a plurality of guide vanes, has solved the problem that the valve seat and the valve core in the existing technology exist and are easy to damage in the process of opening and closing and are subjected to the scouring force.

Description

Technical Field

[0001] This utility model relates to the field of gate valve technology, and more specifically to a gate valve resistant to erosion. 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 an anti-erosion shut-off valve that can improve the structural stability of the valve core and valve seat.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an anti-erosion shut-off valve, comprising a valve body, a valve seat located within the valve body, and a valve core capable of forming a hard seal with the valve seat. A buffer ring is coaxially arranged in the inner cavity of the valve seat, and multiple guide plates distributed around the axis of the buffer ring are arranged on the inner wall of the buffer ring. The multiple guide plates are all inclined relative to the end face of the buffer ring, and the medium flowing upward along the inner wall of the buffer ring is guided by the multiple guide plates to change its flow direction.

[0005] As a further improvement of this utility model, the downward-facing surfaces of the multiple guide plates are all concave.

[0006] As a further improvement of this utility model, the surfaces of the plurality of guide plates facing the valve core are all planar.

[0007] As a further improvement of this utility model, the upper and lower end faces of the plurality of guide pieces are both arc-shaped.

[0008] As a further improvement of this utility model, the inner cavity of the valve seat is frustum-shaped with the large end facing the valve core, and the outer wall of the buffer ring is in contact with the inner wall of the valve seat.

[0009] As a further improvement of this utility model, the valve core is provided with a throttling protrusion on the surface facing the valve seat, which can be inserted into the buffer ring and does not interfere with the multiple guide plates.

[0010] The beneficial effects of this utility model are as follows: the medium flowing upward along the inner wall of the buffer ring is guided by multiple guide plates to change its flow direction and velocity. This design can effectively increase the complexity of the internal flow of the medium, thereby reducing the flow velocity and impact force of the medium flowing between the valve seat and the valve core, greatly reducing the scouring force of the medium on the sealing surfaces of the valve seat and the valve core, improving the structural stability of the valve seat and the valve core, and indirectly ensuring the sealing stability of the valve seat and the valve core when they are closed. Attached Figure Description

[0011] 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 of the buffer ring after a metal layer has been plated on its upper surface. Figure 4 This is a perspective view of the buffer ring in this utility model.

[0012] Reference numerals: 1. Valve body; 2. Valve seat; 3. Valve core; 4. Buffer ring; 5. Guide plate; 6. Throttling protrusion. Detailed Implementation

[0013] 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.

[0014] Reference Figures 1 to 4 As shown, an anti-erosion shut-off valve of this embodiment includes a valve body 1, a valve seat 2 located inside the valve body 1, and a valve core 3 capable of forming a hard seal with the valve seat 2. Based on the aforementioned existing technology, the inner wall of the valve seat 2 is machined into a surface inclined relative to the axis of the valve seat 2, that is, the inner cavity of the valve seat 2 is frustum-shaped with the large end facing the valve core 3. The buffer ring 4 is adapted to the inner cavity of the valve seat 2. Multiple guide plates 5 are integrally formed on the inner wall of the buffer ring 4, evenly distributed around the axis of the buffer ring 4. The multiple guide plates 5 are all inclined relative to the end face of the buffer ring 4. During the assembly process, the buffer ring 4 is inserted into the inner cavity of the valve seat 2 from top to bottom until the outer wall of the buffer ring 4 is fully fitted with the inner wall of the valve seat 2. Then, the buffer ring 4 is welded to the valve seat 2 using tools such as a soldering pen. Finally, the valve core 3, valve stem, and valve cover are installed in sequence. When the valve core 3 is open relative to the valve seat 2, or when the valve seat 2 is open, the buffer ring 4 is welded to the valve seat 2. During the closing process, the medium flows from bottom to top through the buffer ring 4 and mainly includes two flow directions. The medium that is not interfered with by the guide plate 5 is located at the center of the buffer ring 4 and flows from bottom to top. After impacting the valve core 3, it diffuses towards the sealing surface of the valve core 3. The medium that is interfered with by the guide plate 5 is close to the inner wall of the buffer ring 4 and flows between adjacent guide plates 5. The medium flowing between adjacent guide plates 5 flows at a relatively horizontal angle, and the flow rate will decrease. The two media will interfere with each other before flowing through the valve seat 2 and the valve core 3. To further explain, if the guide plate 5 is damaged, the weld can be heat-melted by means of thermal cutting and the buffer ring 4 can be removed from the valve seat 2. This design effectively increases the complexity of the internal flow of the medium, thereby reducing the flow velocity and impact force of the medium flowing between the valve seat 2 and the valve core 3. It greatly reduces the scouring force of the medium on the sealing surfaces of the valve seat 2 and the valve core 3, improves the structural stability of the valve seat 2 and the valve core 3, and indirectly ensures the sealing stability of the valve seat 2 and the valve core 3 when they are closed. The design of making the inner cavity of the valve seat 2 into a frustum shape makes it easier for the buffer ring 4 to automatically align after entering the inner cavity of the valve seat 2, improving the coaxiality of the buffer ring 4 and the valve seat 2 and the installation efficiency. Further optimization, refer to Figure 3 As shown, depending on the purity and type of the medium, a metal layer flush with the sealing surface of the valve seat 2 can be selectively plated on the upper surface of the buffer ring 4 based on the height difference between the upper surface of the buffer ring 4 and the sealing surface of the valve seat 2, so as to avoid impurities accumulating on the upper surface of the buffer ring 4 and affecting the closure between the valve seat 2 and the valve core 3.

[0015] As one specific implementation method of the improvement, refer to Figures 2 to 4 As shown, the downward-facing surfaces of multiple guide plates 5 are all concave. When the medium flows from bottom to top through the guide plates 5, the medium flows along the arc surface facing the guide plates 5. Compared with the design of making the downward-facing surfaces of the guide plates 5 flat, this design can increase the number of times the medium flow direction changes, resulting in a better buffering effect on the medium and indirectly improving the stability of the structure of both the valve seat 2 and the valve core 3.

[0016] As one specific implementation method of the improvement, refer to Figures 2 to 4As shown, the surfaces of the multiple guide plates 5 facing the valve core 3 are all planar. This design can reduce the time and probability of impurities in the medium staying on the guide plates 5. When the valve core 3 and valve seat 2 are closed, the impurities can slide quickly down the upward-facing surface of the guide plates 5 to the bottom of the inner cavity of the valve body 1 under the action of gravity.

[0017] As one specific implementation method of the improvement, refer to Figures 2 to 4 As shown, the upper and lower end faces of the multiple guide plates 5 are all arc-shaped. This design can reduce the impact force of the medium on the guide plates 5, and at the same time prevent impurities from staying on the top of the guide plates 5 and affecting the degree of closure between the valve seat 2 and the valve core 3.

[0018] As one specific implementation method of the improvement, refer to Figure 2 and Figure 3 As shown, a throttling protrusion 6 is integrally formed on the surface of the valve core 3 facing the valve seat 2. During the process of the valve core 3 moving towards the valve seat 2, the throttling protrusion 6 gradually penetrates into the inner cavity of the buffer ring 4. The multiple guide plates 5 do not interfere with the throttling protrusion 6. Compared with the first embodiment, the throttling protrusion 6 interferes with the medium located at the center of the buffer ring 4, thereby changing the flow direction of the medium. This design can further increase the complexity of the medium flow direction, effectively reduce the scouring force of the medium on the valve seat 2 and the valve core 3, and at the same time play a certain throttling role on the medium to avoid the generation of noise.

[0019] 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. An erosion-resistant shut-off valve, comprising a valve body (1), a valve seat (2) located within the valve body (1), and a valve core (3) capable of forming a hard seal with the valve seat (2), characterized in that: The valve seat (2) is coaxially provided with a buffer ring (4). Multiple guide plates (5) are provided on the inner wall of the buffer ring (4) and distributed around the axis of the buffer ring (4). The multiple guide plates (5) are inclined relative to the end face of the buffer ring (4). The medium flowing upward along the inner wall of the buffer ring (4) is guided by the multiple guide plates (5) and changes its flow direction.

2. The anti-erosion shut-off valve according to claim 1, characterized in that: The downward-facing surfaces of the multiple guide pieces (5) are all concave.

3. The anti-erosion shut-off valve according to claim 1 or 2, characterized in that: The surfaces of the multiple guide plates (5) facing the valve core (3) are all planar.

4. An anti-erosion shut-off valve according to claim 1 or 2, characterized in that: The upper and lower end faces of the multiple guide pieces (5) are all arc-shaped.

5. An anti-erosion shut-off valve according to claim 1 or 2, characterized in that: The inner cavity of the valve seat (2) is frustum-shaped with the large end facing the valve core (3), and the outer wall of the buffer ring (4) is in contact with the inner wall of the valve seat (2).

6. An anti-erosion shut-off valve according to claim 1 or 2, characterized in that: The valve core (3) is provided with a throttling protrusion (6) on the surface facing the valve seat (2), which can be inserted into the buffer ring (4) and does not interfere with the multiple guide plates (5).

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