Lift check valve

Abstract

The utility model provides a kind of lift check valve, including valve body, the valve body includes cavity one, cavity two, valve port and the sealing element located above valve port, the cavity one is communicated by valve port and cavity two, the bottom of the valve body is fixedly provided with and the butt joint sleeve of cavity one intercommunication, the mouth portion of the butt joint sleeve is detachably connected with sealing plate, the filter cartridge between valve port and sealing plate is sleeved in the butt joint sleeve, the top of the filter cartridge and the side wall of valve port periphery abut.In the utility model, by setting filter cartridge between cavity one and valve port, so that large particles impurities cannot flow through valve port and sealing element, when sealing element drops check, large particles impurities will not appear the problem of blocking sealing element and valve port adhesion, when sewage check, compared with prior art, it has the advantage that check effect is more reliable.

Description

Technical Field

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

[0002] A lift check valve is a type of automatic valve that opens and closes based on the flow of the medium itself to prevent backflow. When a lift check valve malfunctions or becomes clogged, the usual solution is to remove the valve cover and use it as an inspection port to inspect the valve body. However, modern lift check valves are difficult to reinstall after the valve cover is removed. This is because the groove on the valve cover is designed to slide with the seal. After the groove is removed, the seal remains inside the valve body, causing it to detach from the groove. This makes it difficult to align the groove with the seal when reinstalling the valve cover, resulting in installation difficulties after maintenance.

[0003] The utility model disclosed in CN219827830U proposes a lift-type check valve. A valve cover is provided at the top cavity, and a bottom protrusion is provided at the bottom of the valve cover. A limiting base plate with a through hole in the middle is provided on the bottom side of the bottom protrusion. The inner side of the bottom protrusion is a hollow sliding groove, and a sealing element is slidably connected to the sliding groove. The sealing element includes a limiting stop, a sliding rod, and a sealing cover. The limiting stop and the limiting base plate cooperate to allow the sealing element to slide in the sliding state of the sliding groove. When the valve cover needs to be removed for maintenance, the sealing element is simultaneously removed with the cooperation of the limiting base plate and the limiting stop. Therefore, when reinstalling the valve cover, it is not necessary to align the sliding groove and the sealing element, making installation faster and simpler. This solves the technical problem of difficulty in realigning and reinstalling the valve cover after maintenance in current lift-type check valves.

[0004] However, this existing technology still has shortcomings in its use: during the process of sewage transmission and backflow prevention, because the sewage contains some large hard particles, these hard particles are easily trapped between the seal and the valve port when the sewage valve is activated, causing the seal to fail to effectively block the valve port, which greatly reduces the backflow prevention effect.

[0005] Therefore, this utility model provides a lift-type check valve. Utility Model Content

[0006] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a lift-type check valve to solve the problems mentioned in the background technology. This utility model has the functions of more reliable check valve and more convenient installation and replacement of filter cartridge.

[0007] To achieve the above objectives, this utility model is implemented through the following technical solution: a lift-type check valve, comprising a valve body, the valve body including a first cavity, a second cavity, a valve port, and a sealing element located above the valve port, the first cavity being connected to the second cavity through the valve port, a docking sleeve communicating with the first cavity being fixedly provided at the bottom of the valve body, a sealing plate being detachably connected to the opening of the docking sleeve, a filter cylinder being sleeved inside the docking sleeve between the valve port and the sealing plate, the top of the filter cylinder abutting against the side wall around the valve port.

[0008] Furthermore, an annular docking platform is fixedly installed inside the valve body on the outer periphery of the valve port, a plug sleeve is fixedly connected to one side of the sealing plate, and the two ends of the filter cylinder are respectively plugged into the annular docking platform and the plug sleeve.

[0009] Furthermore, the insert sleeve is covered with a lower buffer sleeve, the annular docking platform is covered with an upper buffer sleeve, and the two ends of the filter cylinder are respectively covered with the lower buffer sleeve and the upper buffer sleeve.

[0010] Furthermore, one end of the mating sleeve is welded with a flange that is bolted to the sealing plate.

[0011] Furthermore, the filter cylinder includes a base cylinder and a filter plate. The outer peripheral wall of the base cylinder has a window near the center, and the filter plate is fixedly sleeved inside the base cylinder and located above the window.

[0012] Furthermore, the filter plate has a conical structure with its small end facing downwards.

[0013] Furthermore, there are two filter plates, which are arranged vertically, with the small ends of the two filter plates facing away from each other.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. In this utility model, by setting a filter cylinder between the cavity and the valve port, large particles of debris cannot flow through the valve port and the seal. When the seal descends to check the flow, there will be no problem of large particles of debris blocking the seal and the valve port from fitting together. Compared with the prior art, this method has the advantage of more reliable flow checking effect when checking sewage.

[0016] 2. In this utility model, a docking sleeve is provided at the bottom of the valve body, and a detachable sealing plate is provided at the opening of the docking sleeve. An annular docking platform is provided in the valve body located on the outer periphery of the valve port, and a plug sleeve is provided on one side of the sealing plate. The two ends of the filter cartridge are distributed and engaged with the annular docking platform and the plug sleeve. This arrangement makes the installation and replacement of the filter cartridge more convenient. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a lift-type check valve according to this utility model;

[0018] Figure 2 for Figure 1 A diagram at the bottom;

[0019] Figure 3 This is a schematic diagram of the filter cylinder of a lifting check valve of this utility model after it has exploded and unfolded.

[0020] In the diagram: 1. Valve body; 11. Chamber 1; 12. Chamber 2; 13. Valve port; 14. Seal; 15. Annular docking platform; 151. Upper buffer sleeve; 2. Docking sleeve; 21. Flange; 3. Sealing plate; 31. Insert sleeve; 311. Lower buffer sleeve; 4. Filter cylinder; 41. Base cylinder; 411. Window; 42. Filter plate. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0022] Please see Figures 1 to 3 This utility model provides a technical solution: a lift-type check valve, including a valve body 1, the valve body 1 including a first cavity 11, a second cavity 12, a valve port 13 and a sealing element 14 located above the valve port 13. The first cavity 11 is connected to the second cavity 12 through the valve port 13. After water enters the first cavity 11, it pushes open the sealing element 14, the sealing element 14 moves upward, and the valve port 13 opens. At this time, the flow passes through the valve port 13 and enters the second cavity 12. The structure and action guiding structure of the sealing element 14 can adopt the structure in the patent documents mentioned in the background art.

[0023] In this technical solution, a connecting sleeve 2 for cavity 11 is fixedly installed at the bottom of the valve body 1. A sealing plate 3 is detachably connected to the opening of the connecting sleeve 2. Specifically, a flange 21 connected to the sealing plate 3 by bolts is welded to one end of the connecting sleeve 2. A PTFE gasket is placed between the sealing plate 3 and the flange 21 during use. A filter cylinder 4 is installed inside the connecting sleeve 2, located between the valve port 13 and the sealing plate 3. The filter cylinder 4 is a cylindrical structure with open ends. After removing the sealing plate 3, the filter cylinder 4 can be removed and replaced. The top of the filter cylinder 4 abuts against the side wall around the valve port 13. The fluid in cavity 11 enters the open valve port 13 after being filtered by the filter cylinder 4. Large particles of debris (such as gravel particles, clumps, and other hard foreign objects with a certain volume) are blocked from entering cavity 2 12, thereby effectively preventing the above-mentioned large particles of debris from blocking the sealing element 14 from descending and sealing the valve port 13, ensuring check valve performance.

[0024] In this embodiment, an annular docking platform 15 is fixedly installed inside the valve body 1, located on the outer periphery of the valve port 13. A sleeve 31 is fixedly connected to one side of the sealing plate 3. The two ends of the filter cylinder 4 are respectively inserted and connected to the annular docking platform 15 and the sleeve 31. The annular docking platform 15 and the sleeve 31 can effectively limit the filter cylinder 4 and prevent it from bending and deforming after being subjected to fluid impact for a long time.

[0025] Furthermore, a lower buffer sleeve 311 is provided on the outer sleeve of the insert 31, and an upper buffer sleeve 151 is provided on the outer side of the annular docking platform 15. The two ends of the filter cylinder 4 are respectively fitted on the outer side of the lower buffer sleeve 311 and the upper buffer sleeve 151. The lower buffer sleeve 311 and the upper buffer sleeve 151 are connected to the two ends of the filter cylinder 4 by an interference fit. This arrangement not only makes the filter cylinder 4 easy to install, but also buffers the impact of water. The upper end of the sealing plate 3 is bonded with an elastic pad (not shown in the figure) fitted on the outer side of the insert 31. One end of the bottom of the filter cylinder 4 abuts against the upper surface of the elastic pad. Thus, when the sealing plate 3 is fixedly installed, it will squeeze the filter cylinder 4, so that the top of the filter cylinder 4 abuts against the side wall around the valve port 13.

[0026] In this embodiment, the filter cylinder 4 includes a base cylinder 41 and a filter plate 42. A window 411 near the center is provided on the outer peripheral wall of the base cylinder 41. The filter plate 42 is fixedly sleeved inside the base cylinder 41 and located above the window 411. The filter plate 42 is made of a perforated plate, and the aperture of the filter holes on the filter plate 42 is one of 3mm, 4mm, and 5mm. This aperture effectively prevents particulate matter that might prevent the sealing member 14 and the valve port 13 from closing from entering between the valve port 13 and the sealing member 14.

[0027] Furthermore, the filter plate 42 has a conical structure with its small end facing downwards. This arrangement increases the filtration area and facilitates the settling of blocked particles. In a specific implementation, it is preferable to have two filter plates 42 arranged vertically, with the small ends of the two filter plates 42 facing away from each other. When debris gets stuck in the filter holes of the lower filter plate 42, and the stuck debris enters the upper layer of the lower filter plate 42 under the long-term impact of the fluid, the upper filter plate 42 will provide secondary protection, thereby effectively delaying the time it takes for debris to enter the valve port 13.

[0028] Working principle: Before installation, chamfers are made at both ends of the base cylinder 41. During installation, one end of the base cylinder 41 is fitted onto the outside of the lower buffer sleeve 311. At this time, ensure that the small end of the filter plate 42 is aligned with the sealing plate 3. Then, align the sealing plate 3 with the flange 21, while ensuring that the PTFE gasket is located between the sealing plate 3 and the flange 21. Then, press the sealing plate 3. At this time, the other end of the base cylinder 41 is fitted onto the outside of the upper buffer sleeve 151 under the guidance of the chamfer. Then, use bolts to lock the sealing plate 3 and the flange 21. At this time, the entire filter cylinder 4 is installed. The check valve is installed in the sewage discharge pipeline and is ensured to be in an installation state that allows the sealing element 14 to move up and down. After the sewage pump is started, the sewage enters the first chamber 11, then enters the window 411, and after being filtered by the filter plate 42, it pushes open the sealing element 14 and then enters the second chamber 12. At this time, large particles of debris will be blocked below the filter plate 42, and at the same time, these particles of debris will settle at the bottom of the base cylinder 41. After long-term use, when maintaining the pipeline, the sealing plate 3 can be removed with a wrench, and then the filtered debris can be discharged.

[0029] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A lift-type check valve, comprising a valve body (1), the valve body (1) comprising a first chamber (11), a second chamber (12), a valve port (13), and a sealing element (14) located above the valve port (13), the first chamber (11) being connected to the second chamber (12) via the valve port (13), characterized in that, The bottom of the valve body (1) is fixedly provided with a docking sleeve (2) communicating with cavity one (11). The opening of the docking sleeve (2) is detachably connected with a sealing plate (3). A filter cylinder (4) is sleeved inside the docking sleeve (2) between the valve port (13) and the sealing plate (3). The top of the filter cylinder (4) abuts against the side wall around the valve port (13).

2. The lift-type check valve according to claim 1, characterized in that: The valve body (1) is fixedly provided with an annular docking platform (15) located on the outer periphery of the valve port (13). A sleeve (31) is fixedly connected to one side of the sealing plate (3). The two ends of the filter cylinder (4) are respectively inserted and connected to the annular docking platform (15) and the sleeve (31).

3. A lift-type check valve according to claim 2, characterized in that: The insert (31) is covered with a lower buffer sleeve (311), the annular docking platform (15) is covered with an upper buffer sleeve (151), and the two ends of the filter cylinder (4) are respectively covered with the lower buffer sleeve (311) and the upper buffer sleeve (151).

4. A lift-type check valve according to claim 1, characterized in that: One end of the mating sleeve (2) is welded with a flange (21) that is bolted to the sealing plate (3).

5. A lift-type check valve according to claim 1, characterized in that: The filter cylinder (4) includes a base cylinder (41) and a filter plate (42). The outer peripheral wall of the base cylinder (41) has a window (411) near the middle. The filter plate (42) is fixedly sleeved inside the base cylinder (41) and located above the window (411).

6. A lift-type check valve according to claim 5, characterized in that: The filter plate (42) has a conical structure with its small end facing downwards.

7. A lift-type check valve according to claim 5, characterized in that: The number of filter plates (42) is two and they are distributed vertically, with the small ends of the two filter plates (42) facing away from each other.

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