High-temperature-resistant check valve

Abstract

The high-temperature-resistant check valve comprises a valve body, a lining, a valve clack, a gland and a sealing gasket, the valve body is provided with a main body part, a positioning ring and reinforcing ribs circumferentially distributed between the main body part and the positioning ring, and the reinforcing ribs are obliquely and downwards distributed towards the positioning ring from outside to inside; by optimizing the internal structure of the valve body and obliquely designing the reinforcing ribs, the positioning ring, the reinforcing ribs and the main body part form a stable triangular structure, and when the positioning ring is subjected to axial pressure, acting force is uniformly dispersed and transmitted to the main body part in the oblique direction of the reinforcing ribs, so that the valve body is prevented from being damaged. The structural strength of the connecting position of the positioning ring and the reinforcing rib is improved, the connecting position is not prone to cracking when the lining is pressed, the rejection rate of the valve body in the production process is reduced, and the manufacturing cost is saved.

Description

Technical Field

[0001] This utility model relates to the technical field of valves, and in particular to a high-temperature resistant check valve. Background Technology

[0002] A check valve is an automatic valve that relies on the pressure of the medium itself and the weight of the valve disc to automatically block backflow, thus preventing backflow of the medium. It is widely used in various pipeline systems. In the traditional check valve structure, the valve body is equipped with a positioning ring for installing the valve disc, as well as a reinforcing rib that is vertically connected between the positioning ring and the valve body to improve the connection strength of the positioning ring.

[0003] However, during the assembly of the check valve, the bushing needs to be pressed into the locating ring in the center of the valve body using a hydraulic press. Due to the use of an interference fit, a large shear force is generated at the connection between the locating ring and the reinforcing rib during press fitting, which can easily cause cracking at the connection, resulting in the scrapping of the entire valve body and increasing production costs. Utility Model Content

[0004] To overcome the shortcomings of the prior art, the technical solution adopted by this utility model is: a high-temperature resistant check valve, including a valve body, a bushing, a valve disc, a gland, and a sealing gasket. The valve body is provided with a main body and a positioning ring, and reinforcing ribs are distributed circumferentially between the main body and the positioning ring. The reinforcing ribs are distributed from the outside to the inside and inclined downwards towards the positioning ring. The positioning ring is fixedly connected to the bushing, and the valve disc is slidably connected to the positioning ring through the bushing. The main body is fitted with a gland corresponding to the valve disc, and the gland is sealed to the valve body through a sealing gasket. The valve disc is provided with a weld overlay layer, and the valve disc is sealed to the gland through the weld overlay layer.

[0005] By adopting the above technical solution and optimizing the internal structure of the valve body, the reinforcing ribs are designed with an inclination, so that the positioning ring, reinforcing ribs and the main body form a stable triangular structure. When the positioning ring is subjected to axial pressure, the force is evenly distributed and transmitted to the main body along the inclination direction of the reinforcing ribs, which improves the structural strength of the connection between the positioning ring and the reinforcing ribs. When pressing the bushing, the connection is not easy to crack, reducing the scrap rate of the valve body during production and saving manufacturing costs.

[0006] The present invention is further configured such that the main body is provided with an outlet groove, an intermediate groove and an installation groove in sequence from top to bottom, the positioning ring is provided in the intermediate groove by means of reinforcing ribs, the pressure cap is snapped into the installation groove, and the pressure cap is provided with an inlet groove that communicates with the outlet groove.

[0007] Furthermore, the inner diameter of the outlet groove is smaller than the inner diameter of the intermediate groove, and an inclined arc surface is provided between the outlet groove and the intermediate groove. One end of the reinforcing rib is connected to the inclined arc surface, and the other end is connected to the outer side of the positioning ring.

[0008] Furthermore, the connection between the reinforcing rib and the outlet tank and the intermediate tank is rounded.

[0009] Using the above technical solution, the inclined arc surface serves as the supporting surface for the reinforcing rib. When the positioning ring is subjected to impact force, the force is transmitted to the main body through the reinforcing rib and the inclined arc surface, thereby improving the stability of the positioning ring structure. Furthermore, the connection between the reinforcing rib and the main body is rounded to eliminate sharp corners and prevent local accumulation of materials.

[0010] The present invention is further configured such that the positioning ring is fitted with a bushing, and the bottom of the bushing is provided with a boss portion for abutting the positioning ring; the valve disc is provided with a valve stem portion and a sealing portion, and the valve stem portion is provided with a limiting surface that matches the boss portion.

[0011] Using the above technical solution, the bushing is made of stainless steel. When the medium impacts the valve disc and causes it to open rapidly, the valve disc moves vertically upward along the bushing through the valve stem. The boss ensures that the valve disc does not get stuck during the movement, thereby improving the sensitivity of the check valve disc and ensuring that the valve disc can be smoothly reset every time it opens.

[0012] The present invention is further configured such that the pressure cap has an inner tube portion and a boss portion two coaxially distributed, the mounting groove has a stepped surface for abutting the boss portion two, and the boss portion two has a sealing groove for installing a sealing gasket in the direction facing the stepped surface.

[0013] Furthermore, the sealing part is provided with an annular weld overlay layer one, and the end face of the inner tube part is provided with a weld overlay layer two corresponding to the weld overlay layer one.

[0014] The above technical solution features two independent sealing structures at the gland. The first seal is a static seal between the gland and the valve body maintained by a sealing gasket made of 304 stainless steel and graphite, preventing the medium from flowing out from the mounting surface between the gland and the valve body. The second seal is formed at the connection surface between the valve disc and the gland by welding 13Cr stainless steel to create two weld overlay layers. This layer can withstand repeated impacts and friction during frequent opening and closing of the valve disc, ensuring a sealing effect each time the valve disc closes. It is suitable for high-temperature working environments not exceeding 425℃.

[0015] The present invention is further configured such that both the valve body and the gland are provided with convex locking blocks, and the convex locking blocks are provided with chamfered surfaces for guiding installation.

[0016] By adopting the above technical solution, after the valve body is fitted with the gland, the mounting surface structure at both ends is symmetrical and identical, thus standardizing the mounting surface. The chamfered surface is used for automatic centering, thereby eliminating the conversion deviation and improving the flexibility of on-site installation.

[0017] The present invention is further configured such that the valve stem portion has an inner hole and a side hole connected to the inner hole.

[0018] By adopting the above technical solution, an inner hole is machined at the valve stem part of the valve disc to reduce the overall weight of the valve disc, and the inner hole of the valve disc is connected to the middle groove of the valve body through the side hole to avoid material accumulation in the inner hole.

[0019] The embodiments of this utility model will be further described below with reference to the accompanying drawings. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the present invention;

[0021] Figure 2 This is a cross-sectional view of the valve body of this utility model;

[0022] Figure 3 This is a top view of the valve body of this utility model;

[0023] Figure 4 This utility model Figure 1 A magnified view of a section at point A in the middle;

[0024] Figure 5 This utility model Figure 1 A magnified view of a section at point B in the middle;

[0025] Figure 6 This is a cross-sectional view of a traditional check valve;

[0026] Wherein: 1-valve body, 2-bulb, 3-valve disc, 4-gland, 5-sealing gasket, 10-main body, 11-positioning ring, 12-reinforcing rib, 13-liquid outlet groove, 14-intermediate groove, 15-mounting groove, 16-sloping arc surface, 17-rounded corner, 18-step surface, 19-convex locking block, 20-chamfered surface, 21-bore part one, 31-weld overlay layer one, 32-valve stem part, 33-sealing part, 34-limiting surface, 35-inner hole, 36-side hole, 41-liquid inlet groove, 42-inner tube part, 43-bore part two, 44-sealing groove, 45-weld overlay layer two; Detailed Implementation

[0027] The embodiments of this utility model will now be described with reference to the accompanying drawings. In this process, to ensure clarity and convenience, we may exaggerate the width of lines or the size of constituent elements in the drawings.

[0028] Furthermore, the terms used below are defined based on the functions of this utility model and may vary depending on the intentions or conventions of the user or operator. Therefore, these terms are defined based on the entire contents of this specification.

[0029] like Figure 1 , 3As shown, a high-temperature check valve includes a valve body 1, a bushing 2, a valve disc 3, a gland 4, and a sealing gasket 5. The valve body 1 has a main body 10 and a positioning ring 11, and reinforcing ribs 12 distributed circumferentially between the main body 10 and the positioning ring 11. The reinforcing ribs 12 are distributed from the outside to the inside and inclined downwards towards the positioning ring 11. The positioning ring 11 is fixedly connected to the bushing 2, and the positioning ring 11 is slidably connected to the valve disc 3 through the bushing 2. The main body 10 is fitted with a gland 4 corresponding to the valve disc 3, and the gland 4 is sealed to the valve body 1 through the sealing gasket 5. The valve disc 3 has a weld overlay layer 31, and the valve disc 3 is sealed to the gland 4 through the weld overlay layer 31.

[0030] Combination Figure 2 As shown, in this embodiment, the main body 10 is provided with an outlet groove 13, an intermediate groove 14 and an installation groove 15 arranged sequentially from top to bottom. The positioning ring 11 is set in the intermediate groove 14 by a reinforcing rib 12. The pressure cap 4 is snapped into the installation groove 15. The pressure cap 4 is provided with an inlet groove 41 that communicates with the outlet groove 13. The inner diameter of the outlet groove 13 is smaller than the inner diameter of the intermediate groove 14, and a sloping arc surface 16 is provided between the outlet groove 13 and the intermediate groove 14. One end of the reinforcing rib 12 is connected to the sloping arc surface 16, and the other end is connected to the outer side of the positioning ring 11. The connection between the reinforcing rib 12 and the outlet groove 13 and the intermediate groove 14 is provided with a rounded corner 17. The sloping arc surface 16 serves as the support surface of the reinforcing rib 12. When the positioning ring 11 is subjected to an impact force, the force is transmitted to the main body 10 through the reinforcing rib 12 and the sloping arc surface 16, which improves the stability of the positioning ring 11 structure. The connection between the reinforcing rib 12 and the main body 10 is treated with a rounded corner 17 to eliminate sharp corners and avoid local accumulation of materials.

[0031] Combination Figure 4 As shown, in this embodiment, the positioning ring 11 is fitted with a bushing 2, and the bottom of the bushing 2 is provided with a boss portion 21 for abutting the positioning ring 11. The valve disc 3 is provided with a valve stem portion 32 and a sealing portion 33, and the valve stem portion 32 is provided with a limiting surface 34 that matches the boss portion 21. The bushing 2 is a stainless steel bushing 2. When the medium impacts the valve disc 3 and causes it to open rapidly, the valve disc 3 moves vertically upward along the bushing 2 through the valve stem portion 32, and the boss portion 21 ensures that the valve disc 3 does not get stuck during the movement, thereby improving the sensitivity of the check valve disc 3 and ensuring that the valve disc 3 can smoothly reset every time it opens.

[0032] Combination Figure 5As shown, the pressure cap 4 has an inner tube portion 42 and a second boss portion 43 coaxially distributed. The mounting groove 15 has a stepped surface 18 for abutting the second boss portion 43, and the second boss portion 43 has a sealing groove 44 for installing the sealing gasket 5 in the direction facing the stepped surface 18. The sealing part 33 has an annular weld overlay layer 31, and the end face of the inner tube portion 42 has a second weld overlay layer 45 corresponding to the weld overlay layer 31. The pressure cap 4 has two independent sealing structures, wherein the first seal is maintained by the sealing gasket 5. The static seal between the pressure cap 4 and the valve body 1 is achieved by using a gasket 5 made of 304 stainless steel and graphite to prevent the medium from flowing out from the mounting surface between the pressure cap 4 and the valve body 1. The second seal is formed at the connection surface between the valve disc 3 and the pressure cap 4 by welding 13Cr stainless steel to form a first weld overlay 31 and a second weld overlay 45. This seal can withstand repeated impacts and friction during the frequent opening and closing of the valve disc 3, ensuring the sealing effect of the valve disc 3 each time it closes. It is suitable for high-temperature working environments not exceeding 425℃.

[0033] In this embodiment, both the valve body 1 and the gland 4 are provided with convex locking blocks 19. The convex locking blocks 19 are provided with chamfered surfaces 20 for guiding installation. The valve body 1 is provided with flanges at both ends for connecting pipelines. After the gland 4 is installed on the valve body 1, the mounting surface structures at the upper and lower ends of the valve body 1 are symmetrical and identical, thus standardizing the mounting surface. The chamfered surfaces 20 are used for automatic centering to eliminate conversion deviations and improve the flexibility of on-site installation.

[0034] In this embodiment, the valve stem portion 32 is provided with an inner hole 35 and a side hole 36 connected to the inner hole 35. The inner hole 35 is machined at the valve stem portion 32 of the valve disc 3 to reduce the overall weight of the valve disc 3. The inner hole 35 of the valve disc 3 is connected to the intermediate groove 14 of the valve body 1 through the side hole 36 to prevent material from accumulating in the inner hole 35.

[0035] The working principle of this utility model is as follows: when the medium flows from the inlet tank 41 into the intermediate tank 14, the medium pressure overcomes the weight of the valve disc 3 and the back pressure, pushing the valve disc 3 to move vertically upward and open, and then flows from the outlet tank 13 to the outlet tank 13; when the pressure of the inlet tank 41 decreases or backflow occurs, the valve disc 3 falls back and closes quickly under the action of gravity, and the weld overlay layer 31 of the valve disc 3 and the weld overlay layer 45 of the pressure cap 4 are tightly attached to form a reliable metal hard seal, effectively blocking the backflow of the medium.

[0036] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high temperature resistant check valve characterized by, The valve body (1) includes a valve body (1), a bushing (2), a valve disc (3), a pressure cap (4), and a sealing gasket (5). The valve body (1) is provided with a main body (10) and a positioning ring (11), and a reinforcing rib (12) is distributed in a circular pattern between the main body (10) and the positioning ring (11). The reinforcing rib (12) is distributed from the outside to the inside and inclined downwards towards the positioning ring (11). The positioning ring (11) is fixedly connected to the bushing (2), and the positioning ring (11) is slidably connected to the valve disc (3) through the bushing (2). The main body (10) is fitted with a pressure cap (4) corresponding to the valve disc (3), and the pressure cap (4) is sealed to the valve body (1) through the sealing gasket (5). The valve disc (3) is provided with a weld overlay layer (31), and the valve disc (3) is sealed to the pressure cap (4) through the weld overlay layer (31).

2. A high temperature resistant check valve according to claim 1, characterized in that: The main body (10) is provided with an outlet groove (13), an intermediate groove (14) and an installation groove (15) arranged sequentially from top to bottom. The positioning ring (11) is provided in the intermediate groove (14) by means of reinforcing ribs (12). The pressure cap (4) is snapped into the installation groove (15). The pressure cap (4) is provided with an inlet groove (41) that is connected to the outlet groove (13).

3. A high temperature resistant check valve according to claim 2, wherein: The inner diameter of the outlet groove (13) is smaller than the inner diameter of the middle groove (14), and an inclined arc surface (16) is provided between the outlet groove (13) and the middle groove (14). One end of the reinforcing rib (12) is connected to the inclined arc surface (16), and the other end is connected to the outer side of the positioning ring (11).

4. A high temperature resistant check valve according to claim 3, wherein: The connection between the reinforcing rib (12) and the liquid outlet tank (13) and the intermediate tank (14) is provided with a rounded corner (17).

5. A high temperature resistant check valve according to claim 4, wherein: The positioning ring (11) is fitted with a bushing (2), and the bottom of the bushing (2) is provided with a boss part (21) for abutting the positioning ring (11). The valve disc (3) is provided with a valve stem part (32) and a sealing part (33), and the valve stem part (32) is provided with a limiting surface (34) that is adapted to the boss part (21).

6. A high temperature resistant check valve according to claim 5, wherein: The pressure cap (4) has an inner tube portion (42) and a boss portion two (43) coaxially distributed. The mounting groove (15) has a stepped surface (18) for abutting the boss portion two (43), and the boss portion two (43) has a sealing groove (44) for installing the sealing gasket (5) in the direction of the stepped surface (18).

7. A high temperature resistant check valve according to claim 6, wherein: The sealing part (33) is provided with an annular weld overlay layer one (31), and the end face of the inner tube part (42) is provided with a weld overlay layer two (45) corresponding to the weld overlay layer one (31).

8. A high temperature resistant check valve according to claim 6, wherein: Both the valve body (1) and the gland (4) are provided with convex locking blocks (19), and the convex locking blocks (19) are provided with chamfered surfaces (20) for guiding installation.

9. A high temperature resistant check valve according to claim 5, wherein: The valve stem portion (32) is provided with an inner hole (35) and a side hole (36) connected to the inner hole (35).

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