An improved stainless steel flange gate valve with threaded bonnet connection

Abstract

The present invention discloses an improved stainless steel flange gate valve with a valve cover threaded connection, which relates to the technical field of gate valves. It comprises a valve body and a valve cover, connecting pipes are fixed on both sides of the valve body, flanges are fixed on the ends of the connecting pipes, the top of the valve body is fixed to the valve cover through a connecting portion, a gate assembly is provided in the middle of the valve body, water-blocking assemblies are provided on both sides of the gate assembly, when the water-blocking assembly is located between the two water-blocking assemblies, the gate assembly blocks the liquid flowing in the valve body, and a receiving groove is provided on the top of the valve body for receiving the gate assembly. The present invention connects the valve body and the valve cover through the connecting portion. During installation, the gate assembly of the gate valve opening and closing structure can be directly inserted into the receiving groove. When the valve body and the valve cover are threadedly connected, the gate assembly descends into the inner cavity of the valve body, thereby realizing installation. In summary, the gate valve simplifies the disassembly and assembly process and improves the disassembly and assembly efficiency.

Description

Technical Field

[0001] The invention relates to the field of gate valves, in particular to an improved stainless steel flange gate valve with a valve cover threaded connection. Background Art

[0002] In the control of fluid pipelines, gate valves are used to cut off and control the flow of fluid. There are many types of gate valves on the market, which are mainly divided into hard-sealed gate valves and soft-sealed gate valves.

[0003] A Chinese utility model patent, with authorization publication number "CN213839614U," discloses an improved soft-sealed gate valve, comprising a bonnet, valve body, thrust mechanism, valve stem, stem nut, valve disc, and handwheel. The bonnet and valve body are detachably connected. The gate valve adopts a flat-bottom design, which makes the valve body and pipeline in a straight line, facilitating construction.

[0004] Another example is the Chinese utility model patent, authorization announcement number "CN205260890U" discloses an improved valve cover threaded connection flange gate valve, including a valve body, valve cover, valve stem, valve mother, handwheel and valve plate. The valve connection in the existing technology is omitted, and a valve mother is directly used to seal the upper end of the valve cover, saving accessories. This application combines the valve mother and the valve joint into one, and only one accessory needs to be processed and produced during production, saving the time and material costs of producing the valve connection.

[0005] The above solutions solve the technical problems they raise, but they still have certain shortcomings. For example, in the first solution, the valve body and the valve cover are connected by a flange, which requires professional tools to disassemble and assemble, and the disassembly and assembly process is relatively cumbersome. In the second solution, the valve body and the valve cover are screwed together, and the valve cover and the valve mother are also screwed together. Multiple twists are required for disassembly and assembly, and the disassembly and assembly process is also relatively cumbersome. Therefore, an improved stainless steel flange gate valve with a threaded valve cover is proposed to solve the above problems. Summary of the Invention

[0006] The object of the present invention is to provide an improved stainless steel flange gate valve with a threaded valve cover to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an improved stainless steel flange gate valve with a valve cover threaded connection, comprising a valve body and a valve cover, connecting pipes are fixed on both sides of the valve body, flanges are fixed on the ends of the connecting pipes, the top of the valve body is fixed to the valve cover through a connecting portion, a gate assembly is provided in the middle of the valve body, water-blocking assemblies are provided on both sides of the gate assembly, when the water-blocking assembly is located between the two water-blocking assemblies, the gate assembly blocks the liquid flowing in the valve body, a receiving groove is provided on the top of the valve body for receiving the gate assembly, a connecting shaft is fixed on the top of the gate assembly, a bearing is fixed on the top of the connecting shaft, a gate valve opening and closing structure is provided on the top of the bearing, the gate valve opening and closing structure realizes the up and down movement of the gate assembly, the gate valve opening and closing structure comprises a rotating shaft, the bottom end of the rotating shaft is fixed to the outer ring of the bearing, the top rod of the rotating shaft extends out of the valve cover, and a handwheel is fixed on the top of the rotating shaft extending out of the valve cover.

[0008] Furthermore, the water-blocking assembly includes a vertical plate fixed to the valve body, an annular plate is integrally formed at the bottom of the vertical plate, and an inner side plate of the annular plate and a side wall of the receiving groove are located in the same horizontal plane.

[0009] Furthermore, the gate assembly includes a gate body, and wear-resistant plates are fixed on both sides of the gate body, and the outer sides of the wear-resistant plates are in contact with the inner sides of the vertical plates and the annular plates.

[0010] Furthermore, an annular cavity is opened in the middle of the gate body, and the annular cavity separates the gate body into a left plate and a right plate, and a plurality of connecting columns are fixed between the left plate and the right plate.

[0011] Furthermore, an arc-shaped groove is provided at the bottom of the gate body, and an airbag ring is fixed between the side walls of the arc-shaped groove.

[0012] Furthermore, the gate valve opening and closing structure also includes a threaded rod integrally formed with the rotating shaft, an internal threaded tube is fixed to the bottom end of the valve cover, the internal threaded tube is movably screwed to the threaded rod, a movable cavity is opened at the top of the valve cover, a thrust plate is fixed on the rod body of the rotating shaft located in the movable cavity, and an O-ring is fixed on the outside of the thrust plate.

[0013] Furthermore, a plurality of weight-reducing cavities are provided on the valve body, and an indicator plate is fixed to the top end of the valve cover.

[0014] Furthermore, the receiving groove is communicated with the inner cavity of the valve body through a communicating groove.

[0015] Furthermore, the connecting portion includes an external threaded tube fixed to the bottom end of the valve cover, a threaded groove is provided on the top of the valve cover, and the external threaded tube is adapted to the threaded groove.

[0016] Furthermore, a plurality of gaskets are provided between the valve cover and the valve body, a fastening special-shaped block is fixed to the top end of the valve cover, and the rotating shaft passes through the fastening special-shaped block.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] This improved stainless steel flange gate valve with threaded bonnet connection is equipped with a vertical water barrier assembly and a vertical gate assembly. The gate body can move between the vertical plates. The gate valve adopts a flat bottom design (the bottom of existing soft-sealed gate valve products all adopt an angled design, which has a convex point when installed with the pipeline and is inconvenient), which facilitates construction.

[0019] In addition, the design of the gate assembly can reduce the weight of the gate body, which not only improves the wear resistance of the gate body, but also further improves the practicality of the device;

[0020] Furthermore, the valve body and the valve cover are connected through the connecting part. During installation, the gate assembly of the gate valve opening and closing structure can be directly inserted into the receiving groove. When the valve body and the valve cover are threadedly connected, the gate assembly descends into the inner cavity of the valve body, thereby realizing installation. In summary, the gate valve simplifies the disassembly and assembly process and improves the disassembly and assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a left side axial view of the present invention;

[0022] Figure 2 A half-section view of the present invention;

[0023] Figure 3 It is a cross-sectional view of the present invention;

[0024] Figure 4 This is a detailed view of the connection between the valve cover and the gate assembly of the present invention.

[0025] In the figure: 1. Valve body; 101. Connecting pipe; 102. Weight reduction chamber; 103. Connecting groove; 2. Valve cover; 201. Externally threaded pipe; 3. Gate assembly; 301. Gate body; 302. Annular chamber; 303. Connecting column; 304. Air bag ring; 305. Wear-resistant plate; 4. Water-blocking assembly; 401. Vertical plate; 402. Annular plate; 5. Connecting shaft; 6. Bearing; 7. Gate valve opening and closing structure; 701. Rotating shaft; 702. Internally threaded pipe; 703. Movable chamber; 704. Thrust plate; 705. O-ring; 8. Gasket; 9. Fastening special-shaped block; 10. Handwheel; 11. Indicator plate. Implementation Method

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] Furthermore, it should be understood that for the sake of ease of description, the sizes of the various components shown in the drawings are not drawn according to actual proportions. For example, the thickness or width of certain layers may be exaggerated relative to other layers.

[0028] It should be noted that like numbers and letters represent similar items in the following figures, so once an item is defined or described in one figure, it will not need to be further discussed and described in detail in the description of the subsequent figures.

[0029] In the control of fluid pipelines, gate valves are used to achieve flow interception and control. In the prior art, the valve body 1 and valve cover 2 of the gate valve are generally connected by flanges, which requires specialized tools for disassembly and assembly. In addition, some gate valves also use threads to connect the valve body 1 and valve cover 2, but this still has technical problems such as multiple operation steps and inconvenience. To address this issue, the present invention provides a technical solution: an improved stainless steel flange gate valve with a threaded valve cover connection.

[0030] like Figure 1-Figure 4 As shown, the improved stainless steel flange gate valve with valve cover threaded connection includes a valve body 1 and a valve cover 2. Connecting pipes 101 are fixed on both sides of the valve body 1, and flanges are fixed to the ends of the connecting pipes 101, which are connected to external pipelines through the flanges. The top of the valve body 1 is fixed to the valve cover 2 through a connecting portion. In order to reduce the overall weight of the gate valve and save production costs, a plurality of weight-reducing cavities 102 are provided on the valve body 1. It should be noted that the connecting portion includes an external threaded tube 201 fixed to the bottom end of the valve cover 2. In addition, a threaded groove is provided on the top of the valve cover 2, and the external threaded tube 201 is adapted to the threaded groove. During installation, the gate valve can be installed by inserting the external threaded tube 201 into the top of the threaded groove and then rotating the valve cover 2.

[0031] In order to facilitate its installation, an indicator plate 11 is fixed on the top of the valve cover 2, a gate assembly 3 is provided in the middle of the valve body 1, and water-blocking assemblies 4 are provided on both sides of the gate assembly 3. When the water-blocking assembly 4 is located between the two water-blocking assemblies 4, the gate assembly 3 is provided to block the liquid flowing in the valve body 1, and a receiving groove is provided on the top of the valve body 1 for receiving the gate assembly 3. It should be understood that the arrow direction of the indicator plate 11 points to the center position of the short side on both sides of the receiving groove. A connecting shaft 5 is fixed on the top of the connecting shaft 5, and a bearing 6 is fixed on the top of the bearing 6. A gate valve opening and closing structure 7 is provided on the top of the bearing 6. The function of the gate valve opening and closing structure 7 is to realize the up and down movement of the gate assembly 3.

[0032] Among them, the gate valve opening and closing structure 7 includes a rotating shaft 701. It should be noted that the bottom end of the rotating shaft 701 is fixed to the outer ring of the bearing 6, and the top rod of the rotating shaft 701 extends out of the valve cover 2. The top of the rotating shaft 701 extending out of the valve cover 2 is fixed with a handwheel 10 for facilitating the rotation of the rotating shaft 701.

[0033] When the water-blocking component 4 is located at the bottom of the valve body 1, in order to achieve a better liquid-blocking effect, such as Figure 2 As shown, the water-blocking assembly 4 includes a vertical plate 401 fixed to the valve body 1, and an annular plate 402 is integrally formed at the bottom of the vertical plate 401. It should be noted that the inner side plate of the annular plate 402 is located at the same horizontal plane as the side wall of the storage groove.

[0034] To improve the durability of the gate assembly 3, as Figure 3 and Figure 4 As shown, in a specific embodiment of the present scheme, the gate assembly 3 includes a gate body 301 , wear-resistant plates 305 are fixed on both sides of the gate body 301 , and the outer side of the wear-resistant plate 305 is in contact with the inner side of the vertical plate 401 and the annular plate 402 .

[0035] In this solution, in order to improve the corrosion resistance of the gate valve, the gate body 301, the connecting shaft 5 and the rotating shaft 701 are all made of 304 stainless steel.

[0036] The wear-resistant plate 305 is made of EPDM rubber and a wear-resistant material coated on the outer surface of the EPDM rubber. The wear-resistant material is a PET film layer (polyethylene terephthalate) with nano-chromium oxide powder. The thickness of the coated wear-resistant layer is 50 μm, and the particle size of the nano-chromium oxide powder is 6 nm, thereby ensuring the original characteristics of the EPDM rubber, good use effect and long service life.

[0037] In order to reduce the weight of the gate assembly 3 and thus reduce the overall weight of the device, in a specific embodiment of the present scheme, an annular cavity 302 is opened in the middle of the gate body 301, so that the annular cavity 302 separates the gate body 301 into a left plate and a right plate, and a plurality of connecting columns 303 are fixed between the left plate and the right plate. Through the setting of the connecting columns 303, while reducing the weight of the gate body 301, the strength of the gate body 301 is ensured, so that it can withstand the impact of water.

[0038] In order to reduce the force of the gate body 301 moving downward and contacting the inner wall of the valve body 1, and thereby protect the inner wall of the valve body 1, in another specific embodiment of the present scheme, an arc-shaped groove is opened at the bottom of the gate body 301, and an airbag ring 304 is fixed between the side walls of the arc-shaped groove, and the airbag ring 304 is filled with gas.

[0039] It should be noted that, in the initial state, the bottom ring body of the airbag ring 304 protrudes from the gate body 301, and there is a certain distance between the top ring body of the airbag ring 304 and the bottom wall of the arc groove. In this way, when the gate body 301 contacts the inner wall of the valve body 1, the airbag ring 304 is deformed by force, and the airbag ring 304 is deformed toward the inside of the arc groove. In this way, without affecting the sealing between the gate body 301 and the gate body 301, the downward extrusion force of the gate body 301 can be buffered, thereby improving the service life of the device.

[0040] To achieve the up and down movement of the gate body 301, Figure 3 and Figure 4 As shown, the gate valve opening and closing structure 7 also includes a threaded rod integrally formed with the rotating shaft 701, an internal threaded tube 702 is fixed to the bottom end of the valve cover 2, and the internal threaded tube 702 is movably screwed to the threaded rod, and a movable cavity 703 is opened at the top of the valve cover 2. The rotating shaft 701 is located in the movable cavity 703 and a thrust plate 704 is fixed on the rod body. In order to prevent the liquid in the gate valve from overflowing into the movable cavity 703, an O-ring 705 is fixed on the outside of the thrust plate 704.

[0041] In order to avoid the pressure of the air in the receiving groove from squeezing the gate body 301 and ensure that the gate body 301 can move relatively smoothly, Figure 3 As shown, the receiving groove is connected to the inner cavity of the valve body 1 through the connecting groove 103. In this way, when the gate body 301 moves upward, the gas or liquid in the receiving cavity is discharged through the connecting groove 103, reducing the upward resistance of the gate body 301 and further improving the adaptability of the device.

[0042] In order to improve the sealing performance of the device, in this solution, multiple gaskets 8 are provided between the valve cover 2 and the valve body 1 , a fastening special-shaped block 9 is fixed to the top end of the valve cover 2 , and the rotating shaft 701 passes through the fastening special-shaped block 9 .

[0043] To supplement this solution, during installation, the gate assembly 3 of the gate valve opening and closing structure 7 can be directly inserted into the receiving groove. When the valve body 1 and the valve cover 2 are threadedly connected, the gate assembly 3 descends into the inner cavity of the valve body 1, thereby realizing installation. When the gate valve is opened, the hand wheel 10 is turned, and when the hand wheel 10 rotates, the rotating shaft 701 is driven to rotate. Through the mutual threaded connection of the internal threaded tube 702 and the threaded rod and the rolling connection between the rotating shaft 701 and the connecting shaft 5, the horizontal upward movement of the gate body 301 can be realized, thereby realizing the conduction of the gate valve.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is limited by the accompanying embodiments and their equivalents.

Claims

1. An improved stainless steel flange gate valve with a threaded valve cover connection, comprising a valve body (1) and a valve cover (2), wherein connecting pipes (101) are fixed on both sides of the valve body (1), and flanges are fixed at the ends of the connecting pipes (101), characterized in that: The top of the valve body (1) is fixed to the valve cover (2) through a connecting portion. A gate assembly (3) is provided in the middle of the valve body (1). Water-blocking assemblies (4) are provided on both sides of the gate assembly (3). When the gate assembly (3) is located between the two water-blocking assemblies (4), the gate assembly (3) blocks the liquid flowing in the valve body (1). A receiving groove is provided on the top of the valve body (1) for receiving the gate assembly (3). A connecting shaft (5) is fixed to the top of the gate assembly (3). ), a bearing (6) is fixed to the top of the connecting shaft (5), a gate valve opening and closing structure (7) is provided on the top of the bearing (6), the gate valve opening and closing structure (7) realizes the up and down movement of the gate assembly (3), the gate valve opening and closing structure (7) includes a rotating shaft (701), the bottom end of the rotating shaft (701) is fixed to the outer ring of the bearing (6), the top rod of the rotating shaft (701) extends out of the valve cover (2), and a hand wheel (10) is fixed to the top of the rotating shaft (701) extending out of the valve cover (2); The water-blocking assembly (4) comprises a vertical plate (401) fixed to the valve body (1), an annular plate (402) is integrally formed at the bottom of the vertical plate (401), and an inner side plate of the annular plate (402) and a side wall of the receiving groove are located on the same horizontal plane; The gate assembly (3) comprises a gate body (301), wear-resistant plates (305) are fixed on both sides of the gate body (301), and the outer sides of the wear-resistant plates (305) are in contact with the inner sides of the vertical plates (401) and the annular plates (402); An annular cavity (302) is provided in the middle of the gate body (301), and the annular cavity (302) separates the gate body (301) into a left plate and a right plate, and a plurality of connecting columns (303) are fixed between the left plate and the right plate; The receiving groove is connected to the inner cavity of the valve body (1) via a communicating groove (103).

2. The improved stainless steel flange gate valve with threaded bonnet connection according to claim 1 is characterized by: An arc-shaped groove is formed at the bottom of the gate body (301), and an airbag ring (304) is fixed between the side walls of the arc-shaped groove.

3. The improved stainless steel flange gate valve with threaded bonnet connection according to claim 1 is characterized in that: The gate valve opening and closing structure (7) further comprises a threaded rod integrally formed with the rotating shaft (701); an internal threaded tube (702) is fixed to the bottom end of the valve cover (2); the internal threaded tube (702) is movably screwed to the threaded rod; a movable cavity (703) is provided at the top of the valve cover (2); a thrust plate (704) is fixed to the rod body of the rotating shaft (701) located in the movable cavity (703); and an O-ring (705) is fixed to the outer side of the thrust plate (704).

4. The improved stainless steel flange gate valve with threaded bonnet connection according to claim 1 is characterized in that: The valve body (1) is provided with a plurality of weight-reducing cavities (102), and an indicator plate (11) is fixed to the top end of the valve cover (2).

5. The improved stainless steel flange gate valve with threaded bonnet connection according to claim 1 is characterized in that: The connecting portion comprises an externally threaded tube (201) fixed to the bottom end of the valve cover (2); a thread groove is provided on the top of the valve body (1), and the externally threaded tube (201) is adapted to the thread groove.

6. The improved stainless steel flange gate valve with threaded bonnet connection according to claim 1 is characterized in that: A plurality of gaskets (8) are provided between the valve cover (2) and the valve body (1), a fastening special-shaped block (9) is fixed to the top end of the valve cover (2), and the rotating shaft (701) passes through the fastening special-shaped block (9).

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