Check valve

Abstract

The utility model belongs to the field of valves, particularly relates to a check valve, and provides the following scheme aiming at the problems that when the existing American standard check valve is in an open state, a valve clack is easy to continuously move up and down, and most valve covers of the check valve can not be disassembled or are inconvenient to disassemble, the check valve comprises a valve body, a cavity used for fluid circulation is formed in the valve body, the top of the valve body is provided with an opening, the top of the valve body is detachably connected with a valve deck, a plurality of double-end studs penetrate through the interior of the valve deck and the interior of the valve body in a threaded mode, and the outer walls of the double-end studs are sleeved with hexagonal head nuts used in a matched mode in a threaded mode. And the U-shaped block is pushed by the valve clack to move and retract in the chute, so that the vertical plate can move upwards. When water flow pushes the arc-shaped block, the vertical plate moves upwards, the rubber pad at the bottom of the vertical plate abuts against the valve clack, a gap between the valve clack and the inner wall of the valve body is filled, the position of the valve clack is limited again, and abrasion caused by continuous vertical movement of the valve clack is effectively avoided.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a check valve. Background Technology

[0002] In fluid transport systems, check valves are key components used to prevent fluid backflow.

[0003] Traditional ASME (American Standard) check valves have some common problems during use. On the one hand, when the check valve is in the open state, due to factors such as unstable fluid flow, the valve disc is prone to continuous up and down movement. This leads to frequent friction between the valve disc and the inner wall of the valve body, causing severe wear of the valve disc, which in turn affects the sealing performance of the check valve and reduces its service life.

[0004] On the other hand, the valve cover of traditional check valves is mostly non-removable or inconvenient to disassemble. When the valve disc needs to be replaced and repaired, the operation is very difficult, which increases maintenance costs and time.

[0005] Therefore, it is necessary to design an ASME check valve that has high sealing performance and is easy to maintain. Utility Model Content

[0006] The purpose of this invention is to address some common problems encountered in the use of existing ASME (American Standard) check valves. Firstly, when the check valve is open, due to factors such as unstable fluid flow, the valve disc tends to move up and down continuously. This leads to frequent friction between the valve disc and the inner wall of the valve body, causing severe wear on the valve disc and affecting its sealing performance, thus reducing its service life. Secondly, the valve covers of traditional check valves are mostly non-removable or inconvenient to disassemble. When valve disc replacement and maintenance are required, the operation is very difficult, increasing maintenance costs and time. Therefore, this invention proposes a new check valve.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A check valve includes a valve body with an internal cavity for fluid flow. The top of the valve body is open, and a valve cover is detachably connected to the top of the valve body. Multiple double-ended studs are threaded through the internal threads of the valve cover and the valve body. Hexagonal head nuts are threaded onto the outer walls of the double-ended studs for connecting the valve cover and the valve body. A valve disc is rotatably connected to the inner wall of the valve body via an mounting assembly. A valve seat is provided on one inner wall of the valve body, and the valve seat cooperates with the valve disc.

[0009] A limiting block is fixedly connected to the inner wall of the valve body on the side away from the valve seat. The bottom of the limiting block abuts against the top of the valve disc and is used to limit the valve disc. The limiting block is provided with a limiting component for limiting the position of the valve disc.

[0010] In one possible design, the mounting assembly includes a bracket fixedly connected to the inner wall of the valve body, a rocker arm rotatably connected to the inner wall of the bracket, the rocker arm and the bracket being rotatably connected by a cylindrical pin, and one side of the rocker arm being detachably connected to the valve disc.

[0011] In one possible design, the bracket and the valve body are fixedly connected by an internal hexagon screw, and a washer is snapped between the internal hexagon screw and the valve body, the washer being fitted onto the internal hexagon screw.

[0012] In one possible design, a fixing nut is threaded onto one side of the valve disc, and the fixing nut and the valve disc are connected to the same cotter pin, which is used to fix the valve disc and the rocker arm. The fixing nut and the rocker arm are engaged with the same first washer.

[0013] In one possible design, the limiting component includes a vertical groove formed at the bottom of the limiting block, and a connected inclined groove formed on one inner wall of the vertical groove. A U-shaped block slides through the inclined groove, and both ends of the U-shaped block are arc-shaped and extend to the lower side of the limiting block. The valve disc cooperates with the U-shaped block and is used to push the U-shaped block to move laterally inside the inclined groove.

[0014] In one possible design, a vertical plate slides through the interior of the vertical groove, a slider is fixedly connected to one side of the vertical plate, a groove is formed on the inner wall of one side of the vertical groove, the groove is slidably connected to the slider, the vertical plate is located inside the groove of the U-shaped block, an arc-shaped block is fixedly connected to the bottom of the vertical plate, and a rubber pad is fixedly connected to the bottom of one side of the vertical plate to increase the friction between the vertical plate and the valve disc.

[0015] In one possible design, the valve cover and valve body are engaged with the same spiral wound gasket, and the top of the valve cover is threaded with an eye bolt.

[0016] In this application, during use, the fluid inside the valve body pushes the valve disc to rotate, and the valve disc drives the rocker arm to rotate around the cylindrical pin, so that the valve disc can be raised normally to adjust the valve from the closed state to the open state. At the same time, the valve cover can be removed to expose the upper hole of the valve body, so that the valve disc can be replaced and repaired, making it more convenient to use.

[0017] At the same time, when the valve disc is raised to the highest point, it will abut against the bottom of the limiting block. At this time, one side of the valve disc will first push the U-shaped block to move laterally. The U-shaped block moves inside the inclined groove and retracts into the inside of the limiting block. At this time, the top of the vertical plate is no longer blocked by the inner wall of the U-shaped block, and the vertical plate can move up normally. When the water flow pushes the arc-shaped block, the arc-shaped block drives the vertical plate to move up. The slider and the groove can limit the upward movement of the vertical plate. After the vertical plate moves up, the rubber pad at the bottom of one side of the vertical plate abuts against the valve disc, filling the gap between the valve disc and the inner wall of the valve body, thereby limiting the position of the valve disc again, avoiding the valve disc from moving up and down continuously, which would cause serious wear of the valve disc and reduce the sealing performance.

[0018] When the water flow stops, the vertical plate and the arc-shaped block move down again under the action of gravity, and the gravity of the valve disc also pushes the vertical plate down. After the vertical plate moves down, it no longer restricts the U-shaped block, and the U-shaped block will reset again for easy use next time.

[0019] Beneficial effects: When the valve disc of this application is raised to its highest point, it pushes the U-shaped block to move and retract within the inclined groove, allowing the vertical plate to move upward. When the water flow pushes the arc-shaped block, the vertical plate moves upward under the limitation of the slider and the groove. The rubber pad at its bottom abuts against the valve disc, filling the gap between the valve disc and the inner wall of the valve body, further limiting the position of the valve disc, effectively avoiding wear caused by the continuous up-and-down movement of the valve disc, thereby improving the sealing performance of the check valve.

[0020] The valve cover and valve body are detachably connected and secured by multiple studs and hexagonal nuts. When the valve disc needs to be replaced or repaired, simply remove the studs and hexagonal nuts to remove the valve cover, exposing the opening on top of the valve body. This facilitates operation of the valve disc and reduces maintenance difficulty and cost.

[0021] The mounting assembly uses a bracket, rocker arm, and cylindrical pin assembly. The bracket is fixed to the inner wall of the valve body by hexagonal screws and washers. The valve disc and rocker arm are detachably connected by a fixing nut, cotter pin, and first washer. The structure is simple and easy to install, facilitating the replacement and maintenance of parts.

[0022] When the water flow stops, the vertical plate and the arc-shaped block move downwards under the action of gravity. At the same time, the gravity of the valve disc also pushes the vertical plate downwards, so that the vertical plate no longer restricts the U-shaped block. The U-shaped block can automatically reset, making it convenient for the next use and ensuring the normal operation of the check valve.

[0023] A spiral wound gasket is snapped between the valve cover and the valve body to enhance the sealing between them; a lifting eye screw is threaded on the top of the valve cover to facilitate the lifting and handling of the check valve. Attached Figure Description

[0024] Figure 1This is a three-dimensional cross-sectional view of a check valve when it is closed, as proposed in this utility model.

[0025] Figure 2 This is a three-dimensional cross-sectional view of a check valve when it is open, as proposed in this utility model.

[0026] Figure 3 This is a three-dimensional cross-sectional view of the valve body in a check valve proposed in this utility model;

[0027] Figure 4 This is a three-dimensional cross-sectional view of the fixed limiting block and vertical plate in a check valve proposed in this utility model.

[0028] Figure 5 This is an exploded view of the limiting block and vertical plate in a check valve proposed in this utility model.

[0029] In the diagram: 1. Valve body; 2. Valve seat; 3. Valve disc; 4. Rocker arm; 5. First gasket; 6. Fixing nut; 7. Cotter pin; 8. Cylindrical pin; 9. Bracket; 10. Socket head cap screw; 11. Washer; 12. Double-ended stud; 13. Hex head nut; 14. Eye bolt; 15. Valve cover; 16. Spiral wound gasket; 17. Limiting block; 18. Vertical plate; 19. U-shaped block; 20. Arc block; 21. Inclined groove; 22. Vertical groove; 23. Sliding block; 24. Slide groove. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0031] Example 1

[0032] Traditional ASME (American Standard) check valves have several common problems during use. Firstly, when the check valve is open, due to unstable fluid flow, the valve disc tends to move up and down continuously. This leads to frequent friction between the valve disc and the valve body wall, causing severe wear and affecting the valve's sealing performance and reducing its service life. Secondly, the valve cover of traditional check valves is mostly non-removable or difficult to disassemble. When valve disc replacement and maintenance are needed, the operation is very difficult, increasing maintenance costs and time.

[0033] Based on the above issues, referring to Figure 1-5This application proposes a check valve, including a valve body 1. The valve body 1 has an internal cavity for fluid flow. The top of the valve body 1 is open. A valve cover 15 is detachably connected to the top of the valve body 1. Multiple double-ended studs 12 are threaded through the internal threads of the valve cover 15 and the valve body 1. Hexagonal head nuts 13 are threaded onto the outer walls of the double-ended studs 12 for connecting the valve cover 15 and the valve body 1. A valve disc 3 is rotatably connected to the inner wall of the valve body 1 via a mounting assembly. A valve seat 2 is provided on one side of the inner wall of the valve body 1, and the valve seat 2 cooperates with the valve disc 3. The mounting assembly includes a bracket 9 fixedly connected to the inner wall of the valve body 1. A rocker arm 4 is rotatably connected to the inner wall of the bracket 9. The rocker arm 4 and the bracket 9 are rotatably connected via a cylindrical pin 8. One side of the rocker arm 4 is detachably connected to the valve disc 3. The bracket 9 and the valve body 1 are fixedly connected by an internal hexagon screw 10. A washer 11 is snapped between the internal hexagon screw 10 and the valve body 1. The washer 11 is fitted onto the internal hexagon screw 10. A fixing nut 6 is threaded on one side of the valve disc 3. The fixing nut 6 and the valve disc 3 are inserted with the same cotter pin 7. The cotter pin 7 is used to fix the valve disc 3 and the rocker arm 4. The fixing nut 6 and the rocker arm 4 are snapped together with the same first washer 5. The fluid inside the valve body 1 will push the valve disc 3 to rotate. The valve disc 3 drives the rocker arm 4 to rotate around the cylindrical pin 8, so that the valve disc 3 can be raised normally, adjusting the valve from the closed state to the open state. At the same time, the valve cover 15 can be removed, so that the upper hole of the valve body 1 can be exposed, so that the valve disc 3 can be replaced and repaired, making it more convenient to use.

[0034] A limiting block 17 is fixedly connected to the inner wall of the valve body 1 on the side away from the valve seat 2. The bottom of the limiting block 17 abuts against the top of the valve disc 3 and is used to limit the valve disc 3. The limiting block 17 is provided with a limiting component for limiting the position of the valve disc 3. The limiting component includes a vertical groove 22 opened at the bottom of the limiting block 17. A connected inclined groove 21 is opened on one side of the inner wall of the vertical groove 22. A U-shaped block 19 slides through the inclined groove 21. Both ends of the U-shaped block 19 are arc-shaped and extend to the lower side of the limiting block 17. The valve disc 3 works in conjunction with the U-shaped block 19 to push the U-shaped block 19 to move laterally inside the inclined groove 21. A vertical plate 18 slides through the interior of the vertical groove 22. A slider 23 is fixedly connected to one side of the vertical plate 18. A groove 24 is formed on the inner wall of one side of the vertical groove 22, and the groove 24 is slidably connected to the slider 23. The vertical plate 18 is located inside the groove of the U-shaped block 19. An arc-shaped block 20 is fixedly connected to the bottom of the vertical plate 18. A rubber pad is fixedly connected to the bottom of one side of the vertical plate 18 to increase the friction between the vertical plate 18 and the valve disc 3. When valve disc 3 is raised to its highest point, it will abut against the bottom of limit block 17. At this time, one side of valve disc 3 will first push U-shaped block 19 to move laterally. U-shaped block 19 moves inside inclined groove 21 and retracts into limit block 17. At this time, the top of vertical plate 18 is no longer blocked by the inner wall of U-shaped block 19, and vertical plate 18 can move upward normally. When water flow pushes arc block 20, arc block 20 drives vertical plate 18 to move upward. The slider 23 and sliding groove 24 can limit the upward movement of vertical plate 18. After vertical plate 18 moves upward, The rubber pad at the bottom of one side of the vertical plate 18 presses against the valve disc 3, filling the gap between the valve disc 3 and the inner wall of the valve body 1, thereby further limiting the position of the valve disc 3 and preventing the valve disc 3 from moving up and down continuously, which would cause severe wear of the valve disc 3 and reduce the sealing performance. When the water flow stops, the vertical plate 18 and the arc-shaped block 20 move down again under the action of gravity, and the gravity of the valve disc 3 will also push the vertical plate 18 down. After the vertical plate 18 moves down, it no longer limits the U-shaped block 19, and the U-shaped block 19 will reset again for the next use.

[0035] This application can be used in the field of valves, or in other fields applicable to this application.

[0036] Example 2

[0037] refer to Figure 1-5 An improvement based on Example 1: a check valve, which is applied in the field of valves, wherein the valve cover 15 and the valve body 1 are connected by the same spiral wound gasket 16, and the top of the valve cover 15 is threaded with a lifting eye screw 14.

[0038] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0039] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A check valve characterized by, include: The valve body (1) has an internal cavity for fluid flow. The top of the valve body (1) is open. A valve cover (15) is detachably connected to the top of the valve body (1). Multiple double-ended studs (12) are threaded through the internal threads of the valve cover (15) and the valve body (1). A hexagonal head nut (13) is threaded on the outer wall of the double-ended studs (12) for connecting the valve cover (15) and the valve body (1). A valve disc (3) is rotatably connected to the inner wall of the valve body (1) through an installation assembly. A valve seat (2) is provided on one side of the inner wall of the valve body (1). The valve seat (2) is used in conjunction with the valve disc (3). A limiting block (17) is fixedly connected to the inner wall of the valve body (1) away from the valve seat (2). The bottom of the limiting block (17) abuts against the top of the valve disc (3) and is used to limit the valve disc (3). The limiting block (17) is provided with a limiting component for limiting the position of the valve disc (3).

2. A check valve according to claim 1, wherein The mounting assembly includes a bracket (9) fixedly connected to the inner wall of the valve body (1), and a rocker arm (4) is rotatably connected to the inner wall of the bracket (9). The rocker arm (4) and the bracket (9) are rotatably connected by a cylindrical pin (8). One side of the rocker arm (4) is detachably connected to the valve disc (3).

3. A check valve according to claim 2, wherein The bracket (9) and the valve body (1) are fixedly connected by an internal hexagon screw (10). A washer (11) is snapped between the internal hexagon screw (10) and the valve body (1). The washer (11) is sleeved on the internal hexagon screw (10).

4. A check valve according to claim 2, wherein A fixing nut (6) is threaded on one side of the valve disc (3). The fixing nut (6) and the valve disc (3) are connected to the same cotter pin (7). The cotter pin (7) is used to fix the valve disc (3) and the rocker arm (4). The fixing nut (6) and the rocker arm (4) are connected to the same first washer (5).

5. A check valve according to claim 1 wherein, The limiting component includes a vertical groove (22) formed at the bottom of the limiting block (17). A connected inclined groove (21) is formed on one inner wall of the vertical groove (22). A U-shaped block (19) slides through the inclined groove (21). Both ends of the U-shaped block (19) are arc-shaped and extend to the lower side of the limiting block (17). The valve disc (3) is used in conjunction with the U-shaped block (19) to push the U-shaped block (19) to move laterally inside the inclined groove (21).

6. A check valve according to claim 5, characterized in that, A vertical plate (18) slides through the interior of the vertical groove (22). A slider (23) is fixedly connected to one side of the vertical plate (18). A sliding groove (24) is provided on the inner wall of one side of the vertical groove (22). The sliding groove (24) is slidably connected to the slider (23). The vertical plate (18) is located inside the groove of the U-shaped block (19). An arc-shaped block (20) is fixedly connected to the bottom of the vertical plate (18). A rubber pad is fixedly connected to the bottom of one side of the vertical plate (18) to increase the friction between the vertical plate (18) and the valve disc (3).

7. A check valve according to claim 1 wherein, The same winding gasket (16) is clamped between the valve cover (15) and the valve body (1), and the top of the valve cover (15) is screwed with a lifting ring screw (14).

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