Slurry delivery check valve

Abstract

The utility model discloses a kind of ore pulp delivery check valves, it includes valve seat, valve cone, first sealing surface and second sealing surface, valve seat has bottom and peripheral wall, the inner side of the upper end of peripheral wall is inclined downward to the interior of valve seat, the upper end of peripheral wall encloses first opening, bottom has feed port, valve cone includes integrally-formed body part and stem, the lower end of stem passes through the lower surface of body part and passes through bottom, body part is located in first opening, to open or close first opening, the lower end of the outer periphery of body part has mating surface, mating surface is adapted with the inner side of the top of peripheral wall, first sealing surface is located in the inner side of the upper end of peripheral wall by additive manufacturing technology, second sealing surface is located in mating surface by additive manufacturing technology, first sealing surface and second sealing surface abut, at least one of first sealing surface and second sealing surface is made of hard alloy.The wear resistance, corrosion resistance and impact resistance of the ore pulp delivery check valve of the utility model embodiment are high, and sealing effect is good.

Description

Technical Field

[0001] This utility model relates to the field of one-way valve technology, specifically to a one-way valve for conveying mineral slurry. Background Technology

[0002] Slurry refers to a liquid mixture formed by adding water and other auxiliary agents to solid raw materials such as ores and clays in industrial production to extract target elements. A check valve is a key component of a slurry pressurized conveying system, serving a unidirectional flow function. Slurry conveying is characterized by large flow rates, a high concentration of unusually large particles, and high temperatures and acidity. However, in current technology, check valves often use rubber seals, which are susceptible to corrosion, have short service lives, and cannot meet the requirements of normal plant production operations. Utility Model Content

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention provide a slurry conveying check valve.

[0004] The slurry conveying check valve of this utility model embodiment includes: A valve seat having a bottom and a peripheral wall, the outer periphery of the bottom being connected to the lower end of the peripheral wall, the inner edge of the upper end of the peripheral wall being inclined downward toward the interior of the valve seat, the upper end of the peripheral wall forming a first opening, and the bottom having a feed inlet. A valve cone, comprising an integrally formed body and a rod, the lower end of the rod passing through the lower surface of the body and through the bottom, the body being disposed at the first opening to open or close the first opening, the lower end of the outer periphery of the body having a mating surface that is adapted to the inner edge of the top of the peripheral wall; A first sealing surface and a second sealing surface, wherein the first sealing surface is disposed on the inner edge of the upper end of the peripheral wall by additive manufacturing technology, and the second sealing surface is disposed on the mating surface by additive manufacturing technology, wherein the first sealing surface and the second sealing surface abut against each other, and at least one of the first sealing surface and the second sealing surface is made of hard alloy.

[0005] The slurry conveying check valve of this utility model has an inclined inner edge at the upper end of the peripheral wall, which can form a conical surface that matches the mating surface, so that a conical seal can be formed between the upper end of the peripheral wall and the main body. This results in high mating efficiency and improved sealing effect. The upper end of the peripheral wall and the main body are sealed by a sealing surface made of hard alloy, which can improve the wear resistance, corrosion resistance and impact resistance of the sealing surface, extend the service life of the sealing surface, and ensure normal operation and production of the plant. The sealing surface is set by additive manufacturing technology, which makes the sealing surface firmly installed. In addition, the main body and rod of the valve cone are integrally formed, which improves the structural strength of the valve cone and ensures high reliability.

[0006] In some embodiments, the lower end of the first sealing surface extends toward the inner circumferential surface of the peripheral wall and the extension length is 5mm-15mm, and / or, The lower end of the second sealing surface extends toward the bottom surface of the body and the extension length is 5mm-15mm.

[0007] In some embodiments, the first sealing surface has a thickness of 2mm-6mm, and / or, The second sealing surface has a thickness of 2mm-6mm.

[0008] In some embodiments, the mating surface is a spherical surface with a radius of 300mm-500mm.

[0009] In some embodiments, the angle between the inner edge of the upper end of the peripheral wall and the horizontal plane is 32.5°-42.5°.

[0010] In some embodiments, the bottom includes a connecting portion and a web. The connecting portion is located in the middle of the valve seat. There are at least two webs, which are arranged circumferentially at intervals along the peripheral wall. One end of each web is connected to the peripheral wall, and the other end of each web is connected to the connecting portion. The feed inlet is formed between adjacent webs. The connecting portion has a through hole, and the lower end of the rod passes through the through hole.

[0011] In some embodiments, the outer periphery of the cross-section of the web includes a first arc surface, a first connecting surface, a second arc surface, and a second connecting surface connected in sequence. The first arc surface and the second arc surface are arranged opposite to each other in the vertical direction, and the first connecting surface and the second connecting surface are arranged opposite to each other. The curvature of the first arc surface is greater than that of the second arc surface.

[0012] In some embodiments, the slurry conveying check valve further includes: The valve body has a chamber and a second opening. The second opening is located on the bottom surface of the valve body and communicates with the chamber. The inner circumferential outline of the second opening is circular. The diameter of the upper end of the second opening gradually decreases from top to bottom. The valve seat is disposed in the second opening. The outer circumferential surface of the peripheral wall is adapted to the inner circumferential surface of the upper end of the second opening. A sealing element is disposed between the inner peripheral surface of the second opening and the outer peripheral surface of the peripheral wall and extends circumferentially along the peripheral wall. An elastic element is provided, wherein the upper end of the rod extends out of the upper surface of the body, and the elastic element is wound around the upper end of the rod; A cover, wherein the cover is disposed at the opening on the top surface of the valve body; A kit, disposed on the lower surface of the cover, the kit having a channel within which the upper end of the rod is movable.

[0013] In some embodiments, the angle between the inner circumferential surface of the upper end of the second opening and the horizontal plane is 84°-87°. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the closed state of the slurry conveying check valve according to an embodiment of the present invention.

[0015] Figure 2 This is a schematic diagram of the slurry conveying check valve in the open state according to an embodiment of this utility model.

[0016] Figure 3 This is a schematic diagram of the contact area between the body and the upper end of the peripheral wall of the slurry conveying one-way valve according to an embodiment of the present invention.

[0017] Figure 4 This is a cross-sectional schematic diagram of the web of the slurry conveying check valve according to an embodiment of the present invention.

[0018] Figure 5 yes Figure 1 An enlarged schematic diagram of part A in the middle.

[0019] Reference numerals: 1. Valve seat; 11. Bottom; 111. Connecting part; 1111. Perforation; 112. Web plate; 1121. First arc surface; 1122. First connecting surface; 1123. Second arc surface; 1124. Second connecting surface; 12. Peripheral wall; 121. Groove; 13. First opening; 14. Feed port; 2. Valve cone; 21. Body part; 211. Mating surface; 22. Rod part; 3. First sealing surface; 4. Second sealing surface; 5. Valve body; 51. Chamber; 52. Second opening; 61. Sealing element; 62. Elastic element; 63. Cover body; 64. Kit; 641. Channel. Detailed Implementation

[0020] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0021] like Figures 1-5As shown, the slurry conveying check valve of this utility model embodiment includes a valve seat 1, a valve cone 2, a first sealing surface 3, and a second sealing surface 4. The valve seat 1 has a bottom 11 and a peripheral wall 12. The outer periphery of the bottom 11 is circular, and the outer periphery of the bottom 11 is connected to the lower end of the peripheral wall 12. The inner edge of the upper end of the peripheral wall 12 is inclined downward toward the interior of the valve seat 1, and the upper end of the peripheral wall 12 forms a first opening 13. The bottom 11 has a feed inlet 14. Specifically, the inner edge of the upper end of the peripheral wall 12 can form a conical surface.

[0022] The valve cone 2 includes an integrally formed body portion 21 and a rod portion 22. The lower end of the rod portion 22 passes through the lower surface of the body portion 21 and through the bottom 11. The body portion 21 is provided with a first opening 13 to open or close the first opening 13. The lower end of the outer periphery of the body portion 21 has a mating surface 211, which is adapted to the inner edge of the top of the peripheral wall 12 so that the mating surface 211 is in the shape of a cone. The mating surface 211 and the inner edge of the upper end of the peripheral wall 12 can form a cone-shaped sealing fit.

[0023] The first sealing surface 3 is provided on the inner edge of the upper end of the peripheral wall 12 by additive manufacturing technology, and the second sealing surface 4 is provided on the mating surface 211 by additive manufacturing technology. The first sealing surface 3 and the second sealing surface 4 abut against each other, and at least one of the first sealing surface 3 and the second sealing surface 4 is made of hard alloy.

[0024] The slurry conveying check valve of this utility model has an inclined inner edge at the upper end of the peripheral wall 12, which can form a conical surface that matches the mating surface 211, so that a conical seal can be formed between the upper end of the peripheral wall 12 and the body part 21. This results in high mating efficiency and improved sealing effect. The upper end of the peripheral wall 12 and the body part 21 are sealed by a sealing surface made of hard alloy, which can improve the wear resistance, corrosion resistance and impact resistance of the sealing surface, extend the service life of the sealing surface, and ensure normal operation and production of the plant. The sealing surface is set by additive manufacturing technology, which makes the sealing surface firmly installed. In addition, the body part 21 and the rod part 22 of the valve cone 2 are integrally formed, which improves the structural strength of the valve cone 2 and ensures high reliability.

[0025] Specifically, liquid can enter through the inlet 14 and lift the main body 21 so that it can flow out through the first opening 13. During the process of the main body 21 being lifted and moved by the liquid, the rod 22 acts as a guide to ensure the stability of the movement of the main body 21. When the liquid does not flow into the inlet 14, the main body 21 seals against the upper end of the peripheral wall 12 under its own weight, preventing the liquid from flowing back from the first opening 13 to the inlet 14, thereby achieving the purpose of one-way passage of the slurry conveying check valve.

[0026] Specifically, the valve seat 1 and valve cone 2 are integrally cast from precipitation-hardening stainless steel or martensitic stainless steel, resulting in high structural strength. Their composition is as follows: C (carbon) ≤0.03%, Si (silicon) ≤0.8%, Mn (manganese) ≤0.8-1.0%, P (phosphorus) ≤0.01%, S (sulfur) ≤0.01%, Cr (chromium): 15.0-18.0%, Ni (nickel): 4.0-5.0%, Cu (copper): 4.2-4.80%, Nb (niobium): 0.15-0.45%, V (vanadium): 0.1-0.4%. The sealing surface is constructed using additive manufacturing techniques such as spray welding or overlay welding. Wear-resistant hard alloy powder is melted and adhered to the inner edge of the upper end of the peripheral wall 12 and the mating surface 211. This is achieved through 2-3 welding processes, ensuring a firm sealing surface, improving the overall service life of the check valve, reducing the replacement frequency of the valve cone 2, saving overall investment costs, and improving efficiency.

[0027] In some embodiments, the lower end of the first sealing surface 3 extends toward the inner circumferential surface of the peripheral wall 12 and the extension length is 5mm-15mm, which increases the connection area between the first sealing surface 3 and the peripheral wall 12 and ensures that the first sealing surface 3 is more firmly connected to the peripheral wall 12.

[0028] The lower end of the second sealing surface 4 extends toward the bottom surface of the body part 21 and the extension length is 5mm-15mm, which increases the connection area between the second sealing surface 4 and the body part 21 and ensures that the first sealing surface 3 is more firmly connected to the peripheral wall 12.

[0029] In some embodiments, the first sealing surface 3 has a thickness dimension of 2mm-6mm, which improves the structural strength and reliability of the first sealing surface 3 and extends its service life.

[0030] The second sealing surface 4 has a thickness of 2mm-6mm, which improves the structural strength and reliability of the second sealing surface 4 and extends its service life.

[0031] In some embodiments, the mating surface 211 is a spherical surface with a radius of 300mm-500mm.

[0032] Specifically, the mating surface 211 is a spherical surface, which can reduce the impact of liquid on the body part 21 and ensure the service life of the body part 21.

[0033] In some embodiments, the angle between the inner edge of the upper end of the peripheral wall 12 and the horizontal plane is 32.5°-42.5°.

[0034] Specifically, the inner edge of the upper end of the peripheral wall 12 can form a conical surface, and the cone angle formed by the extension of the conical surface is 95°-115°, so that the inner edge of the upper end of the peripheral wall 12 can easily and tightly fit with the mating surface 211.

[0035] In some embodiments, the bottom 11 includes a connecting portion 111 and a web 112. The connecting portion 111 is located in the middle of the valve seat 1. There are at least two webs 112, which are arranged circumferentially at intervals along the peripheral wall 12. One end of the web 112 is connected to the peripheral wall 12, and the other end of the web 112 is connected to the connecting portion 111. An inlet 14 is formed between adjacent webs 112. The connecting portion 111 has a through hole 1111, and the lower end of the rod portion 22 passes through the through hole 1111.

[0036] Specifically, there are three web plates 112, which are arranged circumferentially at intervals along the peripheral wall 12. The lower end of the rod 22 passes directly through the perforation 1111. Compared with the prior art, through technical improvements in material formulation and heat treatment, the bushing design between the rod 22 and the perforation 1111 is eliminated. This satisfies both guiding and wear-resistant functions, and reduces the losses caused by one-way valve failure due to bushing failure and detachment.

[0037] Specifically, the hardness stress of the contact portion between the valve cone 2 and the valve seat 1 is HRC38-46.

[0038] In some embodiments, the outer periphery of the cross-section of the web 112 includes a first arc surface 1121, a first connecting surface 1122, a second arc surface 1123, and a second connecting surface 1124 connected in sequence. The first arc surface 1121 and the second arc surface 1123 are arranged opposite to each other in the vertical direction, and the first connecting surface 1122 and the second connecting surface 1124 are arranged opposite to each other. The curvature of the first arc surface 1121 is greater than the curvature of the second arc surface 1123.

[0039] Specifically, the outer periphery of the cross-section of the web 112 is generally streamlined, which reduces the erosion of the web 112 by the liquid and improves the service life of the web 112.

[0040] In some embodiments, the slurry conveying check valve further includes a valve body 5, a seal 61, an elastic element 62, a cover 63, and a kit 64. The valve body 5 has a chamber 51 and a second opening 52. The second opening 52 is located on the bottom surface of the valve body 5 and communicates with the chamber 51. The inner circumferential profile of the second opening 52 is circular, and the diameter of the upper end of the second opening 52 gradually decreases from top to bottom, while the diameter of the lower end of the second opening 52 remains unchanged. A valve seat 1 is disposed in the second opening 52, and the outer circumferential surface of the peripheral wall 12 is adapted to the inner circumferential surface of the upper end of the second opening 52.

[0041] Specifically, the diameter of chamber 51 is 1.4-1.7 times the maximum diameter of the outer periphery of body 21. The diameter of the outer periphery of valve seat 1's peripheral wall 12 gradually decreases from top to bottom, and the diameter of the upper end of the peripheral wall 12 is 1.1-1.2 times the maximum diameter of the outer periphery of body 21. The diameter of the lower end of the peripheral wall 12's inner periphery is 0.6-0.8 times the maximum diameter of the outer periphery of body 21.

[0042] A sealing element 61 is disposed between the inner circumferential surface of the second opening 52 and the outer circumferential surface of the peripheral wall 12 and extends circumferentially along the peripheral wall 12. Specifically, the outer circumferential surface of the peripheral wall 12 has a groove 121 extending circumferentially along the peripheral wall 12. There are two grooves 121, which are spaced apart vertically. There are two sealing elements 61, which correspond one-to-one with the two grooves 121. The sealing elements 61 are disposed within the grooves 121 to form a seal between the peripheral wall 12 and the second opening 52, preventing liquid from flowing into the gap between the peripheral wall 12 and the second opening 52.

[0043] The upper end of the rod 22 extends out of the upper surface of the body 21, and the elastic element 62 is wound around the upper end of the rod 22. The cover 63 is provided at the opening on the top surface of the valve body 5. The kit 64 is provided on the lower surface of the cover 63, and the kit 64 has a channel 641 in which the upper end of the rod 22 can move.

[0044] Specifically, the upper surface of the body portion 21 has a recess (not shown), and the lower end of the elastic member 62 is located in the recess to limit the elastic member 62. Preferably, the elastic member 62 is a spring.

[0045] Specifically, when liquid enters through inlet 14, it can lift the main body 21, compressing the elastic element 62 and generating elastic force. When liquid does not flow into inlet 14, the main body 21 moves downward under its own weight and the elastic force of the elastic element 62, and presses tightly against the inner edge of the upper end of the peripheral wall 12 to form a sealing fit, preventing liquid from flowing back from the first opening 13 to inlet 14.

[0046] In some embodiments, the angle between the inner circumferential surface of the upper end of the second opening 52 and the horizontal plane is 84°-87°.

[0047] Specifically, the inner circumferential surface at the upper end of the second opening 52 can form a conical surface, and the cone angle formed by the extension of the conical surface is 6°-12°. The valve seat 1 is located in the second opening 52, which ensures the sealing between the valve seat 1 and the valve body 5, and facilitates the replacement of the valve seat 1 in the future.

[0048] The manufacturing method of the slurry conveying check valve of this utility model embodiment includes: S1, the base material required for the manufacture of valve seat 1 and valve cone 2.

[0049] Specifically, the base material is precipitation-hardening stainless steel or martensitic stainless steel.

[0050] S2. The base material is melted in a medium-frequency electric furnace and then cast into a mold for solution treatment.

[0051] Specifically, the base material is melted in a medium-frequency electric furnace at a temperature of 1600℃-1680℃, and then cast at a temperature of 1550℃-1600℃. After casting, it is solution treated at a temperature of 1020℃-1060℃, and then quenched in water or oil at a temperature of 460℃-500℃. After aging for 4 hours, the surface hardness of the valve seat 1 and valve cone 2 is HRC38-46.

[0052] S3. Perform weld overlay treatment on the formed valve seat 1 and valve cone 2.

[0053] Specifically, the valve seat 1 and valve cone 2 are made to have a suitable roughness, such as roughness Ra3.2.

[0054] S4. Hard alloy is applied to the surfaces of valve seat 1 and valve cone 2 using additive manufacturing technology to form a sealing surface; Specifically, the valve body 5 and valve cone 2 are preheated to 400℃-600℃ respectively. A 1mm-2mm layer of hard alloy is plasma-sprayed onto the surfaces of the valve body 5 and valve cone 2 to form the underlayer. The composition of the underlayer is: Co: 50-55%, Cr: 27-30%, Fe: 8-10%, W: 3-6%, C: 0.6-0.9%. The heat treatment temperature is 600℃-650℃, and the temperature is held for 4-7 hours. The porosity is less than 1%.

[0055] A 1-2 mm thick layer of hard alloy is plasma-sprayed onto the surface of the bottom layer to form an intermediate layer with the following composition: Co: 50-55%, Cr: 27-30%, Fe: 8-10%, W: 4-8%, C: 0.9-1.2%.

[0056] A surface layer is formed by plasma spraying hard alloy onto the intermediate layer, with the following composition: Co: 53-58%, Cr: 27-30%, Fe: 8-10%, W: 7-10%, C: 1.2-1.3%. The surface is then air-quenched and subjected to low-temperature tempering to relieve stress.

[0057] S5. Use ceramic cutting tools to process the sealing surface.

[0058] Specifically, ceramic cutting tools are used to finish the sealing surface at a cutting speed of 60-120 m / min, and the thickness of the cemented carbide after cutting is 2 mm-5 mm.

[0059] S6. Overall assembly.

[0060] The manufacturing method of the slurry conveying check valve of this utility model involves multi-layer transition spray welding on the surfaces of valve seat 1 and valve cone 2, and matching heat treatment processes, to ensure that the weld overlay layer and the base material are tightly bonded, thereby ensuring that the sealing surface is firmly connected to valve seat 1 and valve cone 2 and will not easily detach.

[0061] The valve seat 1 and valve cone 2 are integrally formed by casting, which improves the structural strength and reliability. The sealing surface is set by additive manufacturing technology and is made of hard alloy, which improves the wear resistance, corrosion resistance and impact resistance of the sealing surface, improves the overall structural strength of the one-way valve, extends its service life, and is simple and easy to operate.

[0062] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model 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 utility model.

[0063] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0064] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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, an electrical connection, or a connection that allows communication between them; 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0065] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0066] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0067] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A slurry conveying check valve, characterized in that, include: Valve seat (1), the valve seat (1) has a bottom (11) and a peripheral wall (12), the outer periphery of the bottom (11) is connected to the lower end of the peripheral wall (12), the inner edge of the upper end of the peripheral wall (12) is inclined downward toward the inside of the valve seat (1), the upper end of the peripheral wall (12) forms a first opening (13), and the bottom (11) has a feed inlet (14); A valve cone (2) includes an integrally formed body part (21) and a rod part (22). The lower end of the rod part (22) passes through the lower surface of the body part (21) and through the bottom (11). The body part (21) is provided at the first opening (13) to open or close the first opening (13). The lower end of the outer periphery of the body part (21) has a mating surface (211). The mating surface (211) is adapted to the inner edge of the top of the peripheral wall (12). A first sealing surface (3) and a second sealing surface (4), wherein the first sealing surface (3) is provided on the inner edge of the upper end of the peripheral wall (12) by additive manufacturing technology, and the second sealing surface (4) is provided on the mating surface (211) by additive manufacturing technology, wherein the first sealing surface (3) and the second sealing surface (4) abut against each other, and at least one of the first sealing surface (3) and the second sealing surface (4) is made of hard alloy.

2. The slurry conveying check valve according to claim 1, characterized in that, The lower end of the first sealing surface (3) extends toward the inner circumferential surface of the peripheral wall (12) and the extension length is 5mm-15mm, and / or, The lower end of the second sealing surface (4) extends toward the bottom surface of the body part (21) and the extension length is 5mm-15mm.

3. The slurry conveying check valve according to claim 1, characterized in that, The first sealing surface (3) has a thickness dimension of 2mm-6mm, and / or, The second sealing surface (4) has a thickness of 2mm-6mm.

4. The slurry conveying check valve according to claim 1, characterized in that, The mating surface (211) is a spherical surface, and the radius of the mating surface (211) is 300mm-500mm.

5. The slurry conveying check valve according to claim 1, characterized in that, The angle between the inner edge of the upper end of the peripheral wall (12) and the horizontal plane is 32.5°-42.5°.

6. The slurry conveying check valve according to claim 1, characterized in that, The bottom (11) includes a connecting part (111) and a web (112). The connecting part (111) is located in the middle of the valve seat (1). There are at least two webs (112), which are arranged circumferentially along the peripheral wall (12). One end of the web (112) is connected to the peripheral wall (12), and the other end of the web (112) is connected to the connecting part (111). The feed inlet (14) is formed between adjacent webs (112). The connecting part (111) has a through hole (1111), and the lower end of the rod (22) passes through the through hole (1111).

7. The slurry conveying check valve according to claim 6, characterized in that, The outer periphery of the cross-section of the web (112) includes a first arc surface (1121), a first connecting surface (1122), a second arc surface (1123), and a second connecting surface (1124) connected in sequence. The first arc surface (1121) and the second arc surface (1123) are arranged opposite to each other in the vertical direction. The first connecting surface (1122) and the second connecting surface (1124) are arranged opposite to each other. The curvature of the first arc surface (1121) is greater than that of the second arc surface (1123).

8. The slurry conveying check valve according to claim 1, characterized in that, Also includes: The valve body (5) has a chamber (51) and a second opening (52). The second opening (52) is located on the bottom surface of the valve body (5) and communicates with the chamber (51). The inner circumferential outline of the second opening (52) is circular. The diameter of the upper end of the second opening (52) gradually decreases from top to bottom. The valve seat (1) is provided in the second opening (52). The outer circumferential surface of the peripheral wall (12) is adapted to the inner circumferential surface of the upper end of the second opening (52). A sealing element (61) is disposed between the inner peripheral surface of the second opening (52) and the outer peripheral surface of the peripheral wall (12) and extends circumferentially along the peripheral wall (12); An elastic element (62) is provided, wherein the upper end of the rod (22) extends out of the upper surface of the body (21), and the elastic element (62) is wound around the upper end of the rod (22); Cover (63), the cover (63) is provided at the opening on the top surface of the valve body (5); A kit (64) is disposed on the lower surface of the cover (63) and has a channel (641) in which the upper end of the rod (22) is movable.

9. The slurry conveying check valve according to claim 8, characterized in that, The angle between the inner circumferential surface of the upper end of the second opening (52) and the horizontal plane is 84°-87°.

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