Compact swing check valve with shell of integrated structure

Abstract

A compact swing check valve with a shell of an integrated structure is characterized in that the compact swing check valve comprises the shell, a limiting ring, a valve seat, a valve clack, a rocker arm, a pin shaft and a cotter pin, the pin shaft and the cotter pin are used for connection, and the shell comprises a medium flow channel inlet, a medium flow channel outlet and an inner space cavity; a medium flow channel inlet inner wall of the medium flow channel inlet and a medium flow channel outlet inner wall of the medium flow channel outlet form a round top portion which is integrally connected and protrudes upwards, a valve seat, a valve clack, a rocker arm, a pin shaft for connection and a cotter pin are placed into a designated position from the medium flow channel inlet or the medium flow channel outlet of the shell in the form of an assembly. At least one peripheral circle of the large outer diameter of the valve seat is in sealed contact with the inner wall of the inlet of the medium flow channel of the shell, so that when the valve clack is opened, passing of medium fluid is facilitated, and when the valve clack is closed, a sealing state is formed to prevent the medium fluid from passing.

Description

Technical Field

[0001] The invention relates to an automatic control valve for petrochemical industry, in particular to a compact swing check valve with an integral structural shell. Background Art

[0002] Swing check valves are an indispensable part of fluid control systems and are widely used in various industrial equipment and facilities, such as chemical, petroleum, electric power, water treatment and other fields. In industrial piping systems, check valves play an important role in preventing the backflow of media.

[0003] Foreign and domestic technical standards for forged steel valves:

[0004] API 602: Steel gate valves, stop valves and check valves for petroleum and natural gas with nominal diameter less than or equal to DN100 (American Petroleum Institute API);

[0005] GB / T 28776 Steel gate valves, stop valves and check valves for petroleum and natural gas industry (nominal diameter less than or equal to DN100) (Chinese national standard);

[0006] JB / T 7746 Compact forged steel valve (Chinese machinery industry standard).

[0007] Forged steel swing check valve is a common type of check valve. The shell is formed in a hot forging die. The valve blank forming process is complicated and requires a lot of equipment and manpower, so the production cost is high. Because forged valves consume a lot of raw materials and are heavy, the manufacturing process requires multiple processes and a long production cycle. In addition, waste gas is generated during the early hot processing of the valve, which will have a certain impact on the ecological environment. Summary of the invention

[0008] In view of the above problems, the present invention is proposed.

[0009] The purpose of the present invention is to achieve low-cost manufacturing by changing the housing structure, the connection method of the valve seat and the valve disc, and the assembly method of the housing, the valve seat, the valve disc, the rocker arm, the pin shaft of the connecting piece and the split pin. Compared with the existing technical standards and other solutions, the advantage of the present invention is that the number of parts is reduced.

[0010] The object is achieved by a non-return valve having the following features.

[0011] A compact swing check valve with an integrated structural shell comprises a shell, a limit ring, a valve seat, a valve disc, a rocker arm and a pin shaft and a cotter pin of a connecting part thereof.

[0012] The shell comprises a medium flow channel inlet, a medium flow channel outlet and an internal space chamber, wherein the medium flow channel inlet inner wall of the medium flow channel inlet and the medium flow channel outlet inner wall of the medium flow channel outlet form an upwardly protruding dome portion which is connected to each other as a whole.

[0013] The valve seat and valve disc and the pin shaft, rocker arm and cotter pin of their connecting parts are put into the specified position from the medium flow channel inlet or medium flow channel outlet of the shell in the form of an assembly, wherein at least one outer circumference of the large outer diameter of the valve seat is in sealing contact with the inner wall of the medium flow channel inlet of the shell.

[0014] In the inner space chamber of the shell, the medium flows from the medium flow channel outlet to the medium flow channel inlet, and the valve flap is closed by the medium pressure to form a sealing state to prevent the medium fluid from passing through.

[0015] In the inner space chamber of the shell, the medium flows from the medium flow channel inlet to the medium flow channel outlet, and the valve flap is opened by the medium pressure, which helps the medium fluid to pass through.

[0016] Each part of the shell is a seamless steel pipe formed by rolling to form an intermediate piece with uniform wall thickness.

[0017] The medium flow channel hole of the valve seat is offset, not concentric with the medium flow channel inlet or the medium flow channel outlet, and is located below the center of the large diameter hole.

[0018] A lateral straight edge is formed above the large outer diameter of the valve seat close to its sealing surface and a curved surface is formed toward one side at the same time.

[0019] A pin hole which can be connected to the rocker arm protrusion and the pin shaft at the same time is formed at the central part of the valve seat curved surface.

[0020] Beneficial Effects

[0021] 1. Saving materials: The patent relates to a compact swing check valve with an integrated structural shell, in which each part of the shell is a seamless steel pipe formed by rolling to form an intermediate piece with uniform wall thickness. Compared with the commercially available compact forged steel swing check valve, it has fewer parts and components, thus saving materials.

[0022] 2. Improve production efficiency: Compared with forging, rolling forming is usually faster and can improve production efficiency.

[0023] 3. Better material properties: Seamless steel pipes may have better corrosion resistance and mechanical properties due to their manufacturing process, thereby improving the durability of the check valve.

[0024] 4. Improved appearance: The surface smoothness of seamless steel pipes makes them look more beautiful.

[0025] 5. Simplify the production process: The rolling forming process is usually simpler than the forging process, which can simplify the production process and reduce the possibility of errors.

[0026] 6. Environmental protection: The process of producing shells with seamless steel pipes is more environmentally friendly and reduces the impact on the environment compared to casting and forging processes.

[0027] 7. Enhanced design flexibility: The calendering method allows for more complex designs and provides more design freedom.

[0028] 8. Improve fluid efficiency: Due to the internal smoothness of the seamless steel pipe, the resistance of the fluid in the valve body can be reduced, thereby improving fluid efficiency.

[0029] 9. Reduced maintenance requirements: Check valves made of seamless steel pipes may require less maintenance due to better material properties and design flexibility.

[0030] 10. Enhanced safety: The stability and reliability of seamless steel pipes may make it a safer option.

[0031] 11. Propose disruptive changes to explore and transform the inherent molding mode of traditional check valves to form innovative and high-quality new quality productivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are helpful for understanding the embodiments;

[0033] Figure 1 It is a cross-sectional view of a compact swing check valve with an integral structural housing in a closed state of the present invention;

[0034] Figure 2 It is a cross-sectional view of the compact swing check valve with an integral structural housing of the present invention in an open state;

[0035] Figure 3 yes Figure 1 a cross-sectional view of the housing;

[0036] Figure 4 yes Figure 1 An enlarged cross-sectional view of the valve seat, valve disc, rocker arm and its connecting pin and cotter pin assembly;

[0037] Figure 5 yes Figure 4 A perspective view of the valve seat;

[0038] Figure 6 yes Figure 4 Sectional view of valve seat;

[0039] Figure 7 yes Figure 6 It is a schematic diagram showing the position of the sealing end face of the valve seat;

[0040] Figure 8 yes Figure 6 A cross-sectional view of the valve seat;

[0041] Fig. 9 is a cross-sectional view of a commercially available compact forged steel swing check valve.

[0042] In the figure:

[0043] 1. Shell;

[0044] 11. Medium flow channel inlet;

[0045] 12. Medium flow channel outlet;

[0046] 13. Internal space chamber;

[0047] 14. Inner wall of medium flow channel inlet;

[0048] 15. Inner wall of medium flow channel outlet;

[0049] 16. Dome top;

[0050] 2. Valve seat;

[0051] 21. Large outer diameter;

[0052] 22. Large diameter hole;

[0053] 22. Large diameter hole;

[0054] 23. Surface;

[0055] 24. Raised part;

[0056] 25. Sealing surface;

[0057] 26. Pin hole;

[0058] 27. Port;

[0059] 28. Medium flow channel hole;

[0060] 29. Horizontal straight edge;

[0061] 210, Yuangu;

[0062] 3. Valve disc;

[0063] 4. Pin;

[0064] 5. Rocker arm;

[0065] 51. Head;

[0066] 6. Limiting ring;

[0067] 7. Split pin. DETAILED DESCRIPTION

[0068] For the convenience of description, the compact swing check valve with an integral structural housing is described as a check valve in the following document.

[0069] like Figure 3 As shown, the housing 1 of the check valve has a medium flow channel inlet 11 and a medium flow channel outlet 12. When the medium flow channel inlet 11 and the medium flow channel outlet 12 are connected, the inner wall 14 of the medium flow channel inlet and the inner wall 15 of the medium flow channel outlet are simultaneously formed with a dome portion 16 that protrudes upward and is integrated with each other. Each part thereof is a semi-finished valve blank housing 1 formed by rolling with uniform wall thickness through commercially available seamless steel pipes.

[0070] The sealing valve seat 2, the sealing valve disc 3, the rocker arm 5 and the pin shaft 4 and the cotter pin 7 of its connecting part enter the designated position from the medium flow channel inlet 11 or the medium flow channel outlet flow channel 12 of the housing 1 in the form of an assembly.

[0071] The large outer diameter 21 of the valve seat 2 has at least one outer circumference, for example, a port 27 at one end that is thinned at the medium flow channel inlet 11 connected to the shell 1. The port 27 is in sealed contact with the inner wall 14 of the medium flow channel inlet of the shell 1. Usually, the mutual sealing is achieved by applying expansion pressure or rolling pressure in the thinned port 27, so as to realize a check valve in the internal space chamber 13 of the shell 1, which helps the outflow of the medium fluid when the valve flap 3 is opened by fluid pressure, and forms a sealing state to prevent the medium fluid from passing through when the valve flap 3 is closed by fluid pressure.

[0072] As described above, the prerequisite for achieving that the valve seat 2, the sealing valve disc 3, the rocker arm 5 and the pin shaft 4 and the cotter pin 7 of its connecting parts enter the specified position from the medium flow channel inlet 11 or the medium flow channel outlet 12 of the shell 1 in the form of an assembly is that after the rocker arm 5, the pin shaft 4 and the pin hole 26 are assembled, the maximum point of the rocker arm 5 should be less than or equal to the maximum outer diameter 21 of the valve seat 2.

[0073] When the medium flow hole 28 of the valve seat 2 meets the standard, the center of the medium flow hole 28 should be appropriately offset downward to ensure that the maximum point of the rocker arm 5 after assembly is less than or equal to the large outer diameter 21 of the valve seat 2, so as not to affect the assembly of the check valve.

[0074] In order to place the assembly of the sealing valve seat 2, the sealing valve disc 3, the rocker arm 5 and its connecting parts, the pin 4 and the cotter pin 7, into the housing 1 without hindrance, the valve seat 2 can be designed as follows: a transverse straight edge 29 is formed above the medium flow channel hole 28 near the sealing surface 25 to form a partial solid curved surface 23, and a raised portion 24 is formed at the position of the pin hole 26 of this solid curved surface 23 to be integrated with the solid curved surface 23. The raised portion 24 preferably extends a circular arc 210 to one side with the pin hole 26 as the center along the plumb line position of the sealing surface 25 so as to connect or insert the head 51 of the rocker arm 5 and the pin 4.

[0075] The best molding mechanism of the sealing valve seat 2, valve disc 3, and rocker arm 5 can be obtained according to the size by cold working and rolling method or hot working and rolling method to obtain semi-finished products with less consumables and suitable for large-scale production and processing, forming high-quality productivity.

[0076] The limiting ring 7 is a setting for the user to insert the pipe to the end position.

[0077] The above is a description of the embodiment that is considered to be the most practical and preferred. The present embodiment should not be limited to the disclosed embodiment, but should include various modifications based on the present invention to obtain further structures, and also include combinations with other embodiments to form new implementation plans to achieve the best effect of the check valve.

Claims

1. A compact swing check valve with an integral structural housing, characterized in that: It comprises a housing (1), a limiting ring (6), a valve seat (2), a valve flap (3), a rocker arm (5), and a connecting pin (4) and a cotter pin (7); The housing (1) comprises a medium flow channel inlet (11), a medium flow channel outlet (12) and an internal space chamber (13); a medium flow channel inlet inner wall (14) of the medium flow channel inlet (11) and a medium flow channel outlet inner wall (15) of the medium flow channel outlet (12) form an upwardly protruding dome portion (16) which is connected to each other in one piece; The valve seat (2), valve flap (3), rocker arm (5), connecting pin shaft (4), and cotter pin (7) are put into a designated position from the medium flow channel inlet (11) or the medium flow channel outlet (12) of the housing (1) in the form of an assembly, wherein at least one outer circumference of the large outer diameter (21) of the valve seat (2) is in sealing contact with the inner wall (14) of the medium flow channel inlet of the housing (1); In the internal space chamber (13) of the housing (1), the medium flows from the medium flow channel outlet (12) to the medium flow channel inlet (11), and the valve flap (3) is closed by the medium pressure, forming a sealing state to prevent the medium fluid from passing through; In the internal space chamber (13) of the housing (1), the medium flows from the medium flow channel inlet (11) to the medium flow channel outlet (12), and the valve flap (3) is opened by the medium pressure, thereby facilitating the passage of the medium fluid.

2. The compact swing check valve with an integral structural housing according to claim 1, characterized in that: The various parts of the shell (1) are seamless steel pipes formed into intermediate pieces with uniform wall thickness by rolling.

3. The compact swing check valve with an integral structural housing according to claim 1, characterized in that: The medium flow channel hole (28) of the valve seat (2) is offset and is not concentric with the medium flow channel inlet (11) or the medium flow channel outlet (12), and is located below the center of the large diameter hole (22).

4. The compact swing check valve with an integral structural housing according to claim 1 or claim 3, characterized in that: A lateral straight edge (29) is formed above the large outer diameter (21) of the valve seat (2) near its sealing surface (25), and a curved surface (23) is formed toward one side at the same time.

5. The compact swing check valve with an integral structural housing according to claim 1 or claim 3 or claim 4, characterized in that: A raised portion (24) that can be connected to the rocker arm (5) is formed at the center of the curved surface (23) of the valve seat (2), and a pin hole (26) in the raised portion (24) is connected to the pin shaft (4).

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