Check valve special for chemical industry

Abstract

The utility model discloses a special check valve for chemical engineering, which comprises a valve body, a first valve pipe is arranged at the bottom end of the valve body, a first lower flange piece is fixed on the outer wall of the lower end of the valve body, a second lower flange piece is fixed on the outer wall of the upper end of the first valve pipe, and the first lower flange piece is in bolted connection with the second lower flange piece. A third lower flange piece is fixedly installed on the outer wall of the end, away from the valve body, of the first valve pipe, a first upper flange piece is fixedly installed on the outer wall of the upper end of the valve body, a second upper flange piece is bolted to the top end of the first upper flange piece, a limiting barrel is arranged in the center of the top end of the second upper flange piece, and stand columns are arranged on the two sides of the top end of the second upper flange piece. First limiting rings are fixed to the outer walls of the upper portions of the stand columns. According to the check valve, the medium conveying range is widened when the check valve is used, the convenience of maintenance of the check valve is improved, the sealing performance of the check valve is guaranteed when the check valve is used, and the backflow phenomenon of the medium is reduced.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically a chemical-specific check valve. Background Technology

[0002] In the field of chemical production, the unidirectional flow of media in pipeline systems is crucial. As an automatic valve, the function of a check valve is to prevent backflow of media and prevent equipment damage, process disruption, or even safety accidents caused by backflow. However, the existing ordinary check valves on the market still have many shortcomings in the chemical production environment. Therefore, it is particularly important to develop a chemical-specific check valve.

[0003] Referring to a chemical-specific check valve with publication number CN208123525U, it includes a valve body, a pressure plate, and a valve disc. A horizontal groove is formed on the upper part of the inlet side of the valve body. Vertical grooves are formed on both sides of the horizontal groove, symmetrically distributed on the horizontal groove. Rotation dampers are installed facing each other on both sides of the inner cavity of the horizontal groove, and a rotating shaft is assembled between the two rotation dampers. This check valve can achieve accurate positioning by combining the two vertical grooves on the horizontal groove with a first threaded plate and a second threaded plate. The position ensures a tighter fit between the valve disc and the seal. By rotating the first and second threaded plates, the first and second threaded plates contact the side walls of the vertical groove, ensuring that the rotating shaft does not move laterally. This makes the assembly between the convex ring and the annular groove on the valve disc more stable, reduces gaps, and increases the stability of the check valve. As can be seen from the above, although this check valve can be used well, it is usually not convenient for dual-channel medium transportation, which limits the medium transportation range of this check valve and often troubles users. Utility Model Content

[0004] The purpose of this utility model is to provide a chemical-specific check valve to solve the problem mentioned in the background art that although check valves can be used well, they are usually not convenient for dual-channel medium transportation, which limits the range of medium transportation.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a chemical-specific check valve, comprising a valve body, a first valve pipe installed at the bottom end of the valve body, a first lower flange fixed to the outer wall of the lower end of the valve body, a second lower flange fixed to the outer wall of the upper end of the first valve pipe, the first lower flange and the second lower flange being bolted together, a third lower flange fixedly installed on the outer wall of the end of the first valve pipe away from the valve body, a first upper flange fixedly installed on the outer wall of the upper end of the valve body, and a second upper flange bolted to the top of the first upper flange. A limiting cylinder is provided at the center of the top of the upper flange. Columns are provided on both sides of the top of the second upper flange. A first limiting ring is fixed on the outer wall above each column. A nut seat is installed on the outer wall of the column above the first limiting ring. A locking nut is threaded onto the outer wall of the column above the nut seat. A second valve pipe is provided on the outer wall of one side of the valve body. A third valve pipe is fixed at the end of the second valve pipe away from the valve body. A first external flange is fixedly installed on the outer wall of one end of the third valve pipe, and a second external flange is fixedly installed on the outer wall of the other end of the third valve pipe.

[0006] Preferably, a valve stem is threadedly installed at the center of the nut seat, the bottom end of the valve stem extends into the interior of the valve body and is fitted with a second rubber plug, and the top end of the valve stem extends into the exterior of the nut seat and is fitted with a valve handle, so as to drive the valve stem to rotate.

[0007] Preferably, a second annular sealing seat is provided on the inner wall of the valve body outside the second rubber plug. The inner wall of the second annular sealing seat contacts the outer wall of the second rubber plug. The second rubber plug is provided to allow the second annular sealing seat to be opened and closed.

[0008] Preferably, a first annular sealing seat is provided on the inner wall of the upper end of the first valve pipe, and a first rubber plug is installed on the top of the first annular sealing seat. The top end of the first rubber plug is connected to the bottom end of the second rubber plug, and the outer wall of the first rubber plug is in contact with the inner wall of the first annular sealing seat. The first rubber plug is provided to open and close the first annular sealing seat.

[0009] Preferably, a second limiting ring is fitted on the outer wall of the valve stem below the nut seat. The second limiting ring is cylindrical in shape, and the upward movement of the valve stem is limited by the setting of the second limiting ring.

[0010] Preferably, a limiting cylinder is provided on the outer side of the valve stem below the second limiting ring. The bottom end of the limiting cylinder is connected to the top end of the second upper flange. The limiting cylinder is provided to limit the rotation range of the valve stem.

[0011] Compared with the prior art, the beneficial effects of this utility model are: the chemical-specific check valve not only improves the medium conveying range when the check valve is used, but also improves the convenience of check valve maintenance, and ensures the sealing performance of the check valve during use, reducing the phenomenon of medium backflow.

[0012] (1) By setting the first external flange and the second external flange, the two external output valve pipes are bolted to the two ends of the third valve pipe. Then, the input pipe is bolted to the bottom of the first valve pipe by the third lower flange. When the medium flows into the valve body from the first valve pipe, the medium flows out through the second valve pipe and the two ends of the third valve pipe and through the output valve pipe. By opening and closing the corresponding output valve pipe, the medium can be transported in a dual-channel manner, thereby improving the medium transport range when the check valve is used.

[0013] (2) The second upper flange is bolted to the first upper flange and the first lower flange is bolted to the second lower flange so that the valve stem and the first valve pipe and other related components can be disassembled and assembled. The first external flange and the second external flange are also set so that the external output valve pipe can be bolted to both ends of the third valve pipe, thereby achieving the purpose of easy disassembly and maintenance of the check valve, thus improving the convenience of check valve maintenance.

[0014] (3) The outer wall of the first rubber plug contacts the inner wall of the first annular sealing seat to initially close the check valve. Then, the outer wall of the second rubber plug contacts the inner wall of the second annular sealing seat to seal the check valve for a second time, thereby ensuring the sealing performance of the check valve during use and reducing the phenomenon of backflow of the medium. Attached Figure Description

[0015] Figure 1 This is a side view of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the structure of this utility model from below;

[0017] Figure 3 This is a frontal cross-sectional view of the present invention.

[0018] Figure 4 This is a top view schematic diagram of the first and second rubber plugs of this utility model.

[0019] In the diagram: 1. Valve body; 2. First lower flange; 3. Second lower flange; 4. First valve pipe; 5. Third lower flange; 6. Second valve pipe; 7. Third valve pipe; 8. First external flange; 9. Second external flange; 10. First upper flange; 11. Second upper flange; 12. Limiting cylinder; 13. Column; 14. Nut seat; 15. First limiting ring; 16. Locking nut; 17. Valve handle; 18. Valve stem; 19. Second limiting ring; 20. First annular sealing seat; 21. First rubber plug; 22. Second annular sealing seat; 23. Second rubber plug. Detailed Implementation

[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. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0021] Please see Figure 1-4 This utility model provides an embodiment of a chemical-specific check valve, comprising a valve body 1, a first valve pipe 4 installed at the bottom end of the valve body 1, a first lower flange 2 fixed on the outer wall of the lower end of the valve body 1, a second lower flange 3 fixed on the outer wall of the upper end of the first valve pipe 4, the first lower flange 2 and the second lower flange 3 being bolted together, a third lower flange 5 fixedly installed on the outer wall of the end of the first valve pipe 4 away from the valve body 1, and a first upper flange 10 fixedly installed on the outer wall of the upper end of the valve body 1, the top end of the first upper flange 10 being bolted together with a second upper flange 5. The second upper flange 11 has a limiting cylinder 12 at the center of its top end. The second upper flange 11 has columns 13 on both sides of its top end. The outer wall above the columns 13 is fixed with a first limiting ring 15. The outer wall above the columns 13 is fitted with a nut seat 14. The center of the nut seat 14 is threaded with a valve stem 18. The bottom end of the valve stem 18 extends into the valve body 1 and is fitted with a second rubber plug 23. The top end of the valve stem 18 extends into the nut seat 14 and is fitted with a valve handle 17.

[0022] In use, the valve handle 17 is configured to drive the valve stem 18 to rotate;

[0023] A second annular sealing seat 22 is provided on the inner wall of the valve body 1 outside the second rubber plug 23, and the inner wall of the second annular sealing seat 22 contacts the outer wall of the second rubber plug 23.

[0024] In use, the second rubber plug 23 is provided to allow the second annular sealing seat 22 to be opened and closed.

[0025] The inner wall of the upper end of the first valve pipe 4 is provided with a first annular sealing seat 20. A first rubber plug 21 is installed on the top of the first annular sealing seat 20. The top end of the first rubber plug 21 is connected to the bottom end of the second rubber plug 23. The outer wall of the first rubber plug 21 is in contact with the inner wall of the first annular sealing seat 20.

[0026] In use, the first rubber plug 21 is provided to open and close the first annular sealing seat 20.

[0027] A second limiting ring 19 is fitted on the outer wall of the valve stem 18 below the nut seat 14. The second limiting ring 19 is arranged in a cylindrical structure.

[0028] In use, the upper movement of the valve stem 18 is limited by the setting of the second limit ring 19;

[0029] A limiting cylinder 12 is provided on the outside of the valve stem 18 below the second limiting ring 19, and the bottom end of the limiting cylinder 12 is connected to the top end of the second upper flange 11.

[0030] In use, the limit cylinder 12 is used to limit the rotation range of the valve stem 18;

[0031] A locking nut 16 is threaded on the outer wall of the column 13 above the nut seat 14. A second valve pipe 6 is provided on the outer wall of one side of the valve body 1. A third valve pipe 7 is fixed at the end of the second valve pipe 6 away from the valve body 1. A first external flange 8 is fixedly installed on the outer wall of one end of the third valve pipe 7. A second external flange 9 is fixedly installed on the outer wall of the other end of the third valve pipe 7.

[0032] In this embodiment, the check valve is initially closed by the outer wall of the first rubber plug 21 contacting the inner wall of the first annular sealing seat 20. Then, the check valve is sealed a second time by the outer wall of the second rubber plug 23 contacting the inner wall of the second annular sealing seat 22, thus ensuring the valve's sealing performance and reducing backflow. Next, the second upper flange 11 is bolted to the first upper flange 10, and the first lower flange 2 is bolted to the second lower flange 3, facilitating the disassembly and assembly of the valve stem 18 and the first valve pipe 4. The first external flange 8 and the second external flange 9 allow for the bolting of external output valve pipes to both ends of the third valve pipe 7, facilitating check valve disassembly and maintenance. Finally, the first external flange 8 and the second external flange 9 bolt the two external output valve pipes to the third valve pipe 7. At both ends, the input pipe is bolted to the bottom end of the first valve pipe 4 via the third lower flange 5. When the medium flows into the valve body 1 from the first valve pipe 4, the medium flows out through the second valve pipe 6 and the two ends of the third valve pipe 7 and through the output valve pipe. By opening and closing the corresponding output valve pipe, the medium can be transported in a dual-channel manner. Alternatively, by rotating the valve handle 17, the valve stem 18 is rotated and slid inside the nut seat 14. The valve stem 18 can then drive the second rubber plug 23 and the first rubber plug 21 to move up and down. When the second rubber plug 23 and the first rubber plug 21 move upward and separate from the second annular sealing seat 22 and the first annular sealing seat 20 respectively, the check valve can be opened and closed. When the second rubber plug 23 and the first rubber plug 21 move downward and contact the second annular sealing seat 22 and the first annular sealing seat 20 respectively, the check valve can be closed, thus completing the use of the check valve.

Claims

1. A chemical-specific check valve, characterized in that: The valve body includes a valve body (1), a first valve pipe (4) is installed at the bottom of the valve body (1), a first lower flange (2) is fixed on the outer wall of the lower end of the valve body (1), a second lower flange (3) is fixed on the outer wall of the upper end of the first valve pipe (4), the first lower flange (2) and the second lower flange (3) are bolted together, a third lower flange (5) is fixedly installed on the outer wall of the end of the first valve pipe (4) away from the valve body (1), a first upper flange (10) is fixedly installed on the outer wall of the upper end of the valve body (1), a second upper flange (11) is bolted to the top of the first upper flange (10), and a limiting cylinder (12) is provided at the center of the top of the second upper flange (11). The second upper flange (11) has two columns (13) on both sides of its top end. A first limiting ring (15) is fixed on the outer wall above the column (13). A nut seat (14) is installed on the outer wall of the column (13) above the first limiting ring (15). A locking nut (16) is threaded on the outer wall of the column (13) above the nut seat (14). A second valve pipe (6) is provided on the outer wall of one side of the valve body (1). A third valve pipe (7) is fixed at the end of the second valve pipe (6) away from the valve body (1). A first external flange (8) is fixed on the outer wall of one end of the third valve pipe (7). A second external flange (9) is fixed on the outer wall of the other end of the third valve pipe (7).

2. The chemical-specific check valve according to claim 1, characterized in that: A valve stem (18) is threadedly installed at the center of the nut seat (14). The bottom end of the valve stem (18) extends into the interior of the valve body (1) and is fitted with a second rubber plug (23). The top end of the valve stem (18) extends into the exterior of the nut seat (14) and is fitted with a valve handle (17).

3. A chemical-specific check valve according to claim 2, characterized in that: A second annular sealing seat (22) is provided on the inner wall of the valve body (1) outside the second rubber plug (23), and the inner wall of the second annular sealing seat (22) is in contact with the outer wall of the second rubber plug (23).

4. A chemical-specific check valve according to claim 2, characterized in that: The inner wall of the upper end of the first valve pipe (4) is provided with a first annular sealing seat (20), and a first rubber plug (21) is installed on the top of the first annular sealing seat (20). The top end of the first rubber plug (21) is connected to the bottom end of the second rubber plug (23), and the outer wall of the first rubber plug (21) is in contact with the inner wall of the first annular sealing seat (20).

5. A chemical-specific check valve according to claim 1, characterized in that: A second limiting ring (19) is fitted on the outer wall of the valve stem (18) below the nut seat (14), and the second limiting ring (19) is arranged in a cylindrical structure.

6. A chemical-specific check valve according to claim 5, characterized in that: A limiting cylinder (12) is provided on the outside of the valve stem (18) below the second limiting ring (19), and the bottom end of the limiting cylinder (12) is connected to the top end of the second upper flange (11).

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