Throttling anti-scouring high-pressure bypass valve

Abstract

The utility model relates to the technical field of valves, and discloses a throttling anti-scouring high-pressure bypass valve which comprises a valve body, a valve cover is fixedly installed on the top of the valve body through a fastening bolt, a valve cage is arranged on the inner wall of the valve body, a plurality of air holes are formed in the valve cage in a penetrating mode, a valve element is connected in the valve cage in a sliding mode, and the valve element is connected with the valve cover in a sliding mode. The outer side of the valve element is in close contact with the inner wall of the valve cage, a valve seat is installed in the valve body and located under the valve element, and an anti-erosion sealing face is arranged on the bottom side of the valve element. Through structural modification of the sealing surface, the sealing surface can be protected from direct erosion of high-speed flow generated by steam injection, the modified sealing surface has good repairability and can be repaired through machining, and a special process coating is added on the surface of the sealing surface for protection, so that the hardness is further enhanced, the erosion resistance of the sealing surface is improved, and the service life of the sealing surface is prolonged. And the hidden danger of internal leakage caused by design defects of the high-pressure bypass valve is effectively prevented.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a throttling and erosion-resistant high-pressure bypass valve. Background Technology

[0002] A high-pressure bypass valve is a valve used to control and regulate fluids in high-pressure transmission pipelines. It is typically installed on the bypass of a high-pressure pipeline to control flow and pressure, ensuring the stable and safe operation of the power plant's transmission system. High-pressure bypass valves combine the functions of a starting regulating valve, a pressure-reducing bypass valve, and a safety valve, and their applications are very wide.

[0003] The existing high-pressure bypass valve is designed such that the valve core sealing surface is at a 45° angle to the valve centerline, and the sealing surface is directly opposite the opening on the valve cage. When the valve is opened, high-pressure wet steam forms high-speed steam streams through the opening on the valve cage, which will impact the valve core sealing surface at a 45° angle. This can easily cause erosion and slag inclusion on the sealing surface, leading to internal leakage of the high-pressure bypass valve. Therefore, further improvements can be made. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides the following technical solution: a throttling and erosion-resistant high-pressure bypass valve, comprising a valve body, a valve cover fixedly mounted on the top of the valve body by fastening bolts, a valve cage provided on the inner wall of the valve body, a plurality of air holes being opened through the interior of the valve cage, a valve core being slidably connected inside the valve cage, and the outer side of the valve core being in close contact with the inner wall of the valve cage, a valve seat being installed inside the valve body and directly below the valve core, a sealing surface resistant to erosion being provided on the bottom side of the valve core, a valve stem penetrating into the interior of the valve body being provided in the middle of the valve cover, a valve outlet filter screen being installed inside the bottom of the valve body and directly below the valve seat, and a desuperheating water nozzle being provided on the outer side of the bottom of the valve body.

[0005] As an optimization, the sealing surface is designed as a planar seal, which increases the width of the sealing surface and can prevent direct erosion by the steam flow.

[0006] As an optimization, the sealing surface is overlaid with Stellite alloy to further improve its erosion resistance.

[0007] As an optimization, the sealing surface is ground and then hardened with an EroSolve coating to further improve the surface hardness of the sealing surface, enhance its erosion resistance, and improve the valve's sealing performance.

[0008] As an optimization, the sealing surface can also be a concave reverse slope sealing design to avoid direct erosion by the steam flow.

[0009] As an optimization, the valve core and valve seat are maintained in a line-sealed configuration.

[0010] As an optimization, the sealing surface is subjected to carburizing and nitriding hardening treatment to provide the sealing surface with erosion resistance.

[0011] The beneficial effects of this utility model are:

[0012] This throttling and erosion-resistant high-pressure bypass valve, through structural modification of the sealing surface, can protect the sealing surface from direct erosion by the high-speed flow generated by steam jet. The modified sealing surface has good repairability and can be repaired by machining. Furthermore, by adding a special process coating to the surface of the sealing surface, the hardness is further enhanced, the erosion resistance of the sealing surface is improved, and the internal leakage risk caused by design defects of the high-pressure bypass valve is effectively prevented.

[0013] This throttling and erosion-resistant high-pressure bypass valve further enhances the erosion resistance of the sealing surface by overlaying Stellite alloy onto the sealing surface and adding an EroSolve titanium alloy coating process. This extends the service life by 3-4 times compared to sealing surfaces that only have Stellite alloy overlay, thereby reducing spare parts procurement and maintenance labor costs, and minimizing safety risks caused by frequent disassembly and maintenance of the high-pressure bypass valve. Attached Figure Description

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

[0015] Figure 2 This utility model Figure 1 Enlarged schematic diagram of a local structure at point A;

[0016] Figure 3 This is a schematic diagram of the structure of the second embodiment of the present utility model;

[0017] Figure 4 This is an enlarged schematic diagram of a partial structure at point B in this utility model 2.

[0018] In the diagram: 1. Valve body; 2. Valve cover; 3. Valve cage; 4. Air hole; 5. Valve core; 6. Valve seat; 7. Valve stem; 8. Valve outlet filter screen; 9. Desuperheating water nozzle. Detailed Implementation

[0019] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[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] Example 1:

[0022] Please see Figure 1-2 A high-pressure bypass valve with throttling and erosion resistance includes a valve body 1, a valve cover 2 fixedly installed on the top of the valve body 1 by fastening bolts, a valve cage 3 provided on the inner wall of the valve body 1, a plurality of air holes 4 through the interior of the valve cage 3, a valve core 5 slidably connected inside the valve cage 3, and the outer side of the valve core 5 closely contacting the inner wall of the valve cage 3, a valve seat 6 installed inside the valve body 1 and directly below the valve core 5, a sealing surface with erosion resistance provided on the bottom side of the valve core 5, a valve stem 7 provided in the middle of the valve cover 2 and penetrating into the interior of the valve body 1, a valve outlet filter screen 8 installed in the bottom of the valve body 1 and directly below the valve seat 6, and a desuperheating water nozzle 9 provided on the outer side of the bottom of the valve body 1.

[0023] Please see Figure 1-2 The sealing surface features a planar sealing design, which increases the width of the sealing surface and prevents direct erosion by the steam flow. The sealing surface is ground and then hardened with an EroSolve coating to further improve the surface hardness, enhance erosion resistance, and improve the valve's sealing performance.

[0024] Example 2:

[0025] Please see Figure 3-4 The sealing surface is designed with an inwardly concave reverse slope to prevent direct erosion by steam flow. The valve core 5 and valve seat 6 maintain a line seal, and the sealing surface is hardened by carburizing and nitriding to provide the sealing surface with erosion resistance.

[0026] In summary, this throttling and erosion-resistant high-pressure bypass valve, through structural modification of the sealing surface, can protect the sealing surface from direct erosion by the high-speed flow generated by steam jet. Furthermore, the modified sealing surface has good repairability and can be repaired through machining. By adding a special process coating to the surface of the sealing surface, the hardness is further enhanced, improving the erosion resistance of the sealing surface and effectively preventing the potential internal leakage caused by design defects in the high-pressure bypass valve.

[0027] By overlaying Stellite alloy onto the sealing surface and adding an EroSolve titanium alloy coating process, the erosion resistance of the sealing surface is further improved, extending its service life by 3-4 times compared to sealing surfaces that only have Stellite alloy overlay. This reduces spare parts procurement and maintenance labor costs, and minimizes safety risks caused by frequent disassembly and maintenance of the high-pressure bypass valve.

[0028] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "join," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings.

[0030] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A high-pressure bypass valve for throttling and erosion resistance, comprising a valve body (1), wherein a valve cover (2) is fixedly installed on the top of the valve body (1) by fastening bolts, a valve cage (3) is provided on the inner wall of the valve body (1), and a plurality of air holes (4) are provided through the interior of the valve cage (3), and a valve core (5) is slidably connected inside the valve cage (3), wherein the outer side of the valve core (5) is in close contact with the inner wall of the valve cage (3), characterized in that: A valve seat (6) is installed inside the valve body (1) and directly below the valve core (5). The bottom side of the valve core (5) is provided with an erosion-resistant sealing surface. A valve stem (7) is provided in the middle of the valve cover (2) and penetrates into the valve body (1). A valve outlet filter (8) is installed inside the bottom of the valve body (1) and directly below the valve seat (6). A desuperheating water nozzle (9) is provided on the outer side of the bottom of the valve body (1).

2. The throttling and erosion-resistant high-pressure bypass valve according to claim 1, characterized in that: The sealing surface is a planar sealing design.

3. The throttling and erosion-resistant high-pressure bypass valve according to claim 2, characterized in that: The sealing surface is overlaid with Stellite alloy.

4. The throttling and erosion-resistant high-pressure bypass valve according to claim 3, characterized in that: The sealing surface is ground and then hardened with EroSolve coating.

5. The throttling and erosion-resistant high-pressure bypass valve according to claim 1, characterized in that: The sealing surface can also be a concave reverse slope sealing design.

6. The throttling and erosion-resistant high-pressure bypass valve according to claim 5, characterized in that: The valve core (5) and valve seat (6) are provided with a line seal.

7. The throttling and erosion-resistant high-pressure bypass valve according to claim 6, characterized in that: The sealing surface is subjected to carburizing and nitriding hardening treatment to provide the sealing surface with erosion resistance.

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