Pass-through y-type slurry valve

Abstract

This invention discloses a straight-through Y-type slurry valve, belonging to the technical field of industrial valves. It includes a first valve body, a second valve body, and a valve seat. The first and second valve bodies are connected, forming a straight-through, uniformly flowing flow channel. The axis of the inlet flow channel of the second valve body, the axis of the through hole of the valve seat, and the axis of the outlet flow channel of the first valve body are approximately collinear. The minimum flow inner diameter of the valve seat is ≤14% smaller than the nominal diameter of the pipe. The inner wall of the flow channel has a smooth, rounded transition throughout. The valve disc moves linearly along the medium flow direction to open and close the valve seat. The sealing surfaces of the valve disc and valve seat are overlaid with Stellite hard alloy, and the inner wall of the flow channel is sprayed with a tungsten carbide wear-resistant and corrosion-resistant coating and mirror-polished. This invention solves the problems of severe scouring, easy scaling and clogging, and short lifespan of traditional Y-type slurry valves with S-shaped flow channels. It improves flow efficiency by approximately 9%, is wear-resistant and scouring-resistant, and is suitable for high-solids-content slurries such as alumina.

Description

Technical Field

[0001] This invention belongs to the technical field of industrial valves, specifically relating to a straight-through Y-type slurry valve. Background Technology

[0002] Most slurry valves on the market currently adopt a Y-type structure, with their valve body cavity typically featuring an S-shaped bend. When the medium passes through the valve, the flow cross-section suddenly narrows and the flow direction abruptly changes. The high-speed impact of the slurry on the valve body sidewall easily generates localized high-speed eddies and lateral scouring, leading to severe wear of the valve body cavity, short service life, and frequent maintenance and replacement. Conventional Y-type slurry valves typically have a seat necking ratio of 20% to 25%, and the bend in the flow channel results in obstructed medium flow and significant pipeline transport resistance.

[0003] In harsh working conditions such as the mud pump outlet in the alumina raw material workshop, the medium is an alkaline slurry of high-alumina solid particles, with a solid content typically ranging from 40% to 60%, which is prone to scaling, settling, and clogging. Under these conditions, the service life of a traditional Y-type slurry valve of the same specification is usually only 3 to 6 months, and the valve body is easily worn through and frequent internal leakage occurs.

[0004] Therefore, existing Y-type slurry valves have technical defects such as rapid erosion and wear, easy scaling and clogging, low flow efficiency, and short lifespan. There is an urgent need for a straight-through, erosion-resistant, scaling-resistant, clogging-resistant, and long-life slurry valve. Summary of the Invention

[0005] This invention provides a straight-through Y-type slurry valve and a clogging method, aiming to solve the technical problems of severe erosion, easy clogging, and short lifespan caused by the S-shaped bend in the flow channel and the large necking ratio of existing Y-type slurry valves.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A straight-through Y-type slurry valve, comprising: The valve body includes a first valve body, a second valve body, and a valve seat. The first and second valve bodies are joined together. The horizontal flow channels of the first and second valve bodies are connected to form a straight, continuous, and uniformly flowing flow channel. The valve seat is located at the joint between the first and second valve bodies. The axis of the inlet flow channel of the second valve body, the axis of the through hole of the valve seat, and the axis of the outlet flow channel of the first valve body are approximately collinear. The minimum flow inner diameter of the valve seat has a reduction ratio of ≤14% to the nominal diameter of the pipe. The inner wall of the flow channel adopts a smooth arc transition structure throughout. A bracket, one end of which is connected to the inclined branch end of the first valve body.

[0007] Furthermore, the straight-through Y-type slurry valve also includes a valve disc, a valve stem, a stuffing box, and a drive device. The valve disc is mounted on the valve seat. One end of the valve stem is connected to the valve disc, and the other end passes through the stuffing box and is connected to the drive device mounted on the support. The valve disc moves linearly along the direction of medium flow to open or close the valve seat through hole, thereby connecting or blocking the flow channel.

[0008] Furthermore, the reduction ratio of the valve seat is 6% to 12%.

[0009] Furthermore, the angle between the inclined branch axis of the first valve body and the horizontal flow channel axis of the first valve body is 45°.

[0010] Furthermore, the second valve body inlet is provided with a converging transition section, and a flow guiding slope is provided between the upper part of the converging transition section and the valve seat sealing surface; the first valve body outlet is provided with a gradually expanding flow guiding transition section.

[0011] Furthermore, the inclined angle of the guide slope is 15°.

[0012] Furthermore, both the sealing surface of the valve disc and the sealing surface of the valve seat are overlaid with a Stellite hard alloy layer, the thickness of which is 3-5 mm and the hardness is ≥ HRC45.

[0013] Furthermore, the inner wall of the flow channel in contact with the slurry is coated with a tungsten carbide wear-resistant and corrosion-resistant coating, the thickness of which is 1.5-2 mm; the inner wall of the flow channel is mirror-polished, and the inner wall roughness Ra≤0.8μm.

[0014] Furthermore, the second valve body and the first valve body are connected and fixed at the joint, and the bracket and the inclined branch of the first valve body are connected and fixed by bolts and nuts; a guide valve cover is provided at the connection between the valve stem and the valve disc, and a split ring is provided on the outside of the guide valve cover, and the split ring is fixed to the valve disc by bolts.

[0015] The beneficial effects of this invention are: (1) High flow efficiency and low transport resistance This invention adopts a straight through-type flow channel with a trend-oriented streamline, and the valve seat diameter reduction ratio is controlled within 14%, preferably 6% to 12%, which is much lower than the diameter reduction ratio of traditional Y-type valves. Combined with a smooth arc transition structure throughout the process, the slurry flow section does not have severe constriction, the medium flow velocity is uniform and stable, local high-speed eddies are avoided, the medium flow efficiency is improved by 9% compared with traditional Y-type valves, and the pipeline transportation resistance is significantly reduced.

[0016] (2) Excellent erosion resistance and significantly extended service life. The valve disc and seat sealing surfaces are overlaid with a 3-5mm thick Stellite hard alloy layer, with a hardness ≥HRC45, which can withstand the erosion and cavitation of high-hardness particles. The entire inner wall of the flow channel is sprayed with a 1.5-2mm thick tungsten carbide wear-resistant and anti-corrosion coating and mirror polished to isolate abrasive wear and media corrosion. Combined with a coaxial straight flow channel and an arc-shaped sidewall guide structure, lateral impact of the media and local high-speed jets are eliminated, significantly reducing internal cavity erosion. Industrial testing showed that under the harsh operating conditions at the outlet of an alumina slurry pump, the valve operated continuously for 18 months without wear-through or internal leakage, extending its service life by more than 3 times compared to traditional products.

[0017] (3) Strong ability to prevent scarring and blockage The entire flow channel features a continuous curved surface, free of right angles, steps, and abrupt changes in texture. A 15° guide slope is incorporated into the valve cavity, allowing solid particles to be conveyed downwards by their own weight, preventing bridging and blockage. When the valve is fully open, a direct, high-speed flow continuously washes over the entire inner cavity wall, achieving self-cleaning through the medium's own flow. Simultaneously, the mirror-polished, low-roughness inner wall significantly reduces the adhesion of scale crystals, allowing normal flow to automatically peel off scale, effectively preventing scale blockage in high-solids, alkaline slurries. Attached Figure Description

[0018] For ease of explanation, the present invention will be described in detail below with reference to specific embodiments and accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the straight-through Y-type slurry valve in this embodiment.

[0020] In the picture: 1-First valve body; 2-Second valve body; 3-Valve seat; 4-Flow channel; 401-Converging transition section; 402-Guiding slope; 403-Gradually expanding guiding transition section; 5-Bracket; 6-Valve disc; 7-Valve stem; 8-Stuffing gland; 9-Drive device; 10-Bolt; 11-Nut; 12-Guide valve disc cover; 13-Split ring. Detailed Implementation

[0021] The following are specific embodiments of the present invention described in conjunction with the accompanying drawings, further illustrating the technical solutions of the present invention. However, the present invention is not limited to these embodiments. Specific details, such as particular configurations and components, are provided in the following description merely to aid in a comprehensive understanding of the embodiments of the present invention. Therefore, those skilled in the art should understand that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention. Furthermore, for clarity and brevity, descriptions of known functions and structures have been omitted.

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other.

[0023] like Figure 1 As shown, this embodiment provides a straight-through Y-type slurry valve, which includes a first valve body 1, a second valve body 2, a valve seat 3, a flow channel 4, a bracket 5, a valve disc 6, a valve stem 7, a stuffing box 8, and a drive device 9.

[0024] The first valve body 1 and the second valve body 2 are fixed together by bolts 10 and nuts 11. The horizontal flow channels inside the two are interconnected, forming a straight through-flow channel 4 with equal trend. The valve seat 3 is embedded between the mating end faces of the first valve body 1 and the second valve body 2. The axis of the inlet flow channel of the second valve body 2, the axis of the through hole of the valve seat 3, and the axis of the outlet flow channel of the first valve body 1 are approximately collinear, with a coaxial deviation of ≤0.02D (D is the nominal diameter of the pipe), ensuring that the medium flows through the valve body in a straight line without sharp turns or lateral deviations.

[0025] The ratio of the minimum flow inner diameter of valve seat 3 to the nominal diameter of the pipe is ≤14%, preferably 6% to 12%, and the optimal embodiment is 8%. Taking a DN400 valve as an example, the nominal pipe diameter D=400mm. The minimum flow inner diameter of a traditional Y valve is 300 to 320mm, with a necking of 20% to 25%. The minimum flow inner diameter of the straight-through Y-type slurry valve of this invention is 352 to 376mm, corresponding to a necking of 6% to 12%. Under extreme working conditions, the maximum necking is 14%, corresponding to a minimum inner diameter of 344mm, which is far superior to the minimum flow diameter level of 300 to 320mm for traditional Y-type valves.

[0026] The inner wall of the flow channel 4 adopts a smooth arc transition structure throughout, without right angles, steps, abrupt changes in shape, or unevenness. The inlet of the second valve body 2 has a converging transition section 401, and a guide slope 402 is provided between the converging transition section 401 and the sealing surface of the valve seat 3. The inclination angle of the guide slope 402 is 15°, and the slope seamlessly connects with the converging transition section 401, eliminating horizontal depressions and dead angles, preventing slurry from accumulating at the bottom. The outlet of the first valve body 1 has a gradually expanding guide transition section 403, ensuring a smooth convergence or transition of the flow line when the medium flows out, avoiding eddy current deposition at the outlet. In a preferred embodiment, a large-radius arc with R=0.8D can be used for a smooth transition on the inlet side, and a smooth arc with R=1.0D can be used on the outlet side, further reducing local resistance.

[0027] The angle between the inclined branch axis of the first valve body 1 and the horizontal flow channel axis of the first valve body 1 is 45°, thus balancing the valve disc opening and closing installation space and the straight flow of the medium.

[0028] One end of the bracket 5 is connected to the inclined branch end of the first valve body 2. This straight-through Y-type slurry valve also includes a valve disc 6, a valve stem 7, a stuffing box 8, and a drive device 9. The valve disc 6 is sealed to the valve seat 3. One end of the valve stem 7 is connected to the valve disc 6, and the other end passes through the stuffing box 8 and connects to the drive device 9 mounted on the bracket 5. The drive device 9 can be manual, electric, pneumatic, or hydraulic. The valve disc 6 is correspondingly positioned on the sealing surface side of the valve seat 3. Driven by the drive device 9, the valve disc 6 moves linearly along the medium flow direction, opening and closing the through hole of the valve seat 3, thus connecting or blocking the flow channel 4. The receiving end face of the valve disc 6 is designed as a hemispherical arc guide head. When the slurry impacts the valve disc, it is diverted to both sides along the arc, avoiding vertical impact and concentrated scouring.

[0029] Both the sealing surfaces of valve disc 6 and valve seat 3 are integrally overlaid with Stellite hard alloy layer. The alloy layer has a thickness of 3-5mm and a hardness ≥HRC45, which has excellent resistance to particle erosion and cavitation, ensuring the service life and sealing reliability of the sealing pair.

[0030] All inner walls of the flow channel 4 that come into contact with the slurry are coated with a tungsten carbide wear-resistant and anti-corrosion coating with a thickness of 1.5-2mm. This coating can isolate the medium from corrosion and abrasive wear. After the coating is applied, the entire straight flow channel is mirror polished to make the inner wall roughness Ra≤0.8μm. This can reduce the adhesion of solid particles, reduce friction and erosion loss, and weaken the adhesion of scale crystals, making the scale easier to be washed away and peeled off by the material flow.

[0031] A guide valve cover 12 is provided at the connection between the valve stem 7 and the valve disc 6. A split ring 13 is provided on the outside of the guide valve cover 12. The split ring 13 is fixed to the valve disc 6 by bolts 10, so as to realize the reliable connection and movement guidance between the valve stem 7 and the valve disc 6.

[0032] The working process of this embodiment is as follows: When the valve is opened, the drive device 9 moves the valve stem 7 and valve disc 6 linearly towards the support 5. The valve disc 6 disengages from the sealing surface of the valve seat 3, and the through hole of the valve seat 3 is fully opened. The slurry flows in from the inlet of the second valve body 2, passes through the converging transition section 401, the guide slope 402, the through hole of the valve seat 3, and the gradually expanding guide transition section 403 at the outlet of the first valve body 1, and is discharged linearly. Because the flow channel is approximately coaxial and linearly continuous, the slurry does not make sharp S-shaped turns or lateral diversion impacts, resulting in a stable flow velocity and making it less prone to low-speed dead zones and scale accumulation. At the same time, the high-speed flowing slurry continuously flushes the entire inner cavity wall surface, achieving self-cleaning and preventing solid particle sedimentation and scale adhesion.

[0033] When the valve is closed, the drive device 9 drives the valve stem 7 and valve disc 6 to move linearly toward the valve seat 3 until the sealing surface of the valve disc 6 is tightly fitted with the sealing surface of the valve seat 3, blocking the flow passage and achieving reliable flow interception.

[0034] The straight-through Y-type slurry valve of this embodiment is particularly suitable for harsh working conditions such as high scouring and high scaling at the outlet of slurry pumps in alumina raw material workshops. The medium is an alkaline slurry of high-alumina solid particles with a solid content of 40% to 60%. During industrial trials at the outlet of slurry pumps in the raw material workshop of Weiqiao Beihai Alumina No. 5 Company, traditional SJS545Y-16C DN400 Y-type slurry valves of the same specification developed problems such as valve body wear-through and internal leakage after 3 to 6 months of normal operation. The straight-through Y-type slurry valve of this invention operated continuously for 18 months without valve body wear-through or internal leakage. Disassembly inspection showed that the wear of the valve cavity was close to 0, and there was no large-area scaling or blockage in the internal cavity. This indicates that the present invention has significant effects in terms of geometric dimensions, flow channel structure, wear resistance protection, and adaptability to working conditions.

[0035] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0036] In the description of this application, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

Claims

1. A straight-through Y-type slurry valve, characterized in that, include: The valve body includes a first valve body (1), a second valve body (2), and a valve seat (3). The first valve body (1) and the second valve body (2) are connected. The horizontal flow channel of the first valve body (1) and the horizontal flow channel of the second valve body (2) are connected to form a straight through-type isotropic flow channel (4). The valve seat (3) is located at the connection between the first valve body (1) and the second valve body (2). The axis of the inlet flow channel of the second valve body (2), the axis of the through hole of the valve seat (3), and the axis of the outlet flow channel of the first valve body (1) are approximately collinear. The minimum flow inner diameter of the valve seat (3) is ≤14% smaller than the nominal diameter of the pipe. The inner wall of the flow channel (4) adopts a smooth arc transition structure throughout. The bracket (5) has one end connected to the inclined branch end of the first valve body (1).

2. The straight-through Y-type slurry valve according to claim 1, characterized in that, It also includes a valve disc (6), a valve stem (7), a stuffing box (8), and a drive device (9). The valve disc (6) is mounted on the valve seat (3). One end of the valve stem (7) is connected to the valve disc (6), and the other end passes through the stuffing box (8) and is connected to the drive device (9) mounted on the bracket (5). The valve disc (6) moves linearly along the direction of medium flow to open or close the through hole of the valve seat (3), so that the flow channel (4) is connected or blocked.

3. A straight-through Y-type slurry valve according to claim 1, characterized in that, The reduction ratio of the valve seat (3) is 6% to 12%.

4. A straight-through Y-type slurry valve according to claim 1, characterized in that, The angle between the inclined branch axis of the first valve body (1) and the horizontal flow channel axis of the first valve body (1) is 45°.

5. A straight-through Y-type slurry valve according to claim 1, characterized in that, The inlet of the second valve body (2) is provided with a converging transition section (401), and a guide slope (402) is provided between the upper part of the converging transition section (401) and the sealing surface of the valve seat (3); the outlet of the first valve body (1) is provided with a gradually expanding guide transition section (403).

6. A straight-through Y-type slurry valve according to claim 5, characterized in that, The inclined angle of the guide slope (402) is 15°.

7. A straight-through Y-type slurry valve according to claim 2, characterized in that, The sealing surfaces of the valve disc (6) and the valve seat (3) are both overlaid with Stellite hard alloy layers, the thickness of which is 3-5 mm and the hardness is ≥ HRC45.

8. A straight-through Y-type slurry valve according to claim 1, characterized in that, The inner wall of the flow channel (4) in contact with the slurry is coated with a tungsten carbide wear-resistant and corrosion-resistant coating with a thickness of 1.5 to 2 mm. The inner wall of the flow channel (4) is mirror polished and has an inner wall roughness Ra≤0.8μm.

9. A straight-through Y-type slurry valve according to claim 2, characterized in that, The second valve body (2) and the first valve body (1) are connected and fixed at the joint, and the bracket (5) and the inclined branch of the first valve body (1) are connected and fixed by bolts (10) and nuts (11); the valve stem (7) and the valve disc (6) are provided with a guide valve disc cover (12), and the guide valve disc cover (12) is provided with a split ring (13) on the outside of the split ring (13), which is fixed to the valve disc (6) by bolts (10).

Images