A slow closing backflow preventing check valve

Abstract

The utility model discloses a kind of slow-closing anti-backflow check valves, it is related to pipeline accessory technical field, including valve shell, the surface of valve shell is connected with inlet pipe and drain pipe, the inside of valve shell is provided with conical sealing sleeve, the center of conical sealing sleeve is movably connected with valve rod, the bottom end of valve rod is provided with valve core, the top end of valve rod is connected with threaded rod, the top end of conical sealing sleeve is fixedly connected with cover plate, the center of cover plate is installed with locating seat, threaded rod is connected with locating seat screw thread, the utility model is rotated threaded rod by round handle, it is adjusted height by locating seat internal thread, drive valve rod to move to threaded connection switch valve core, avoid valve core to cause impact to pipeline by sudden closing, simultaneously, valve core position can accurately control passage size, adapt to different water flow demand, reduce pipeline loss.

Description

Technical Field

[0001] This utility model relates to the field of pipeline fittings technology, and in particular to a slow-closing anti-backflow check valve. Background Technology

[0002] A check valve is a one-way valve that automatically opens and closes based on the pressure difference generated by the flow of the medium itself. Its core function is to prevent backflow of the medium, avoiding damage to equipment such as pumps and compressors, or disruption of the normal working flow within the pipeline due to reverse fluid flow. It requires no manual or external power operation. When the medium flows in the forward direction, its pressure pushes open the valve core, creating a flow channel; when the medium attempts to flow in the reverse direction, the valve core automatically closes the valve seat under the action of reverse pressure and its own gravity, blocking the backflow of the medium. Check valves are widely used in industrial and civil pipeline systems such as water supply and drainage, petrochemicals, HVAC, and water treatment, and are one of the key components ensuring the safe and stable operation of pipeline systems.

[0003] For example, patent CN221401835U discloses a backflow prevention check valve, which includes: a housing, a sealing cover, a backflow prevention device, and a filter plate. The backflow prevention device includes a blocking ring installed inside the housing, a through hole on one side of the blocking ring, and a limit rod fixed to one side of the blocking ring.

[0004] Currently available check valves generally suffer from uncontrollable closing speeds. Due to the lack of an effective control mechanism during the valve core's closing process, when the medium flow rate changes abruptly or a reverse flow trend occurs, the valve core often closes too quickly. This rapid closure instantly obstructs the reverse-flowing medium in the pipeline, generating significant backflow impact energy and causing water hammer. This impact energy not only severely damages the check valve's core components such as the valve core, seat, and seals, but may also lead to component deformation, accelerated wear, or even direct damage, shortening the check valve's lifespan. Furthermore, it poses a potential risk to the stability and safety of the entire pipeline system. Utility Model Content

[0005] The purpose of this utility model is to solve the problems existing in the prior art by proposing a slow-closing anti-backflow check valve.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a slow-closing anti-backflow check valve, comprising a valve shell, wherein an inlet pipe and a drain pipe are connected to the surface of the valve shell, a conical sealing sleeve is provided inside the valve shell, a valve stem is movably connected to the center of the conical sealing sleeve, a valve core is provided at the bottom end of the valve stem, a threaded rod is connected to the top end of the valve stem, a cover plate is fixedly connected to the top end of the conical sealing sleeve, a positioning seat is installed at the center of the cover plate, and the threaded rod is threadedly connected to the positioning seat.

[0007] Preferably, the top end of the valve stem is provided with a hexagonal groove, and the bottom end of the threaded rod is fixedly connected with a hexagonal stud.

[0008] Preferably, a round handle is fixedly connected to the top end of the threaded rod, and a protective sleeve is provided on the outer side wall of the round handle.

[0009] Preferably, screws are provided on the outer periphery of the cover plate, and the cover plate is installed on the valve body by the screws.

[0010] Preferably, positioning screws are provided on both sides of the positioning seat, and the positioning seat is detachably connected to the cover plate by the positioning screws.

[0011] Preferably, the positioning seat has a positioning hole at its center, and a threaded sleeve is slidably connected inside the positioning hole.

[0012] Preferably, the inner wall of the positioning hole is provided with a flat key, the outer wall of the threaded sleeve is provided with a flat keyway that matches its shape, and the threaded sleeve is threadedly connected to the threaded rod.

[0013] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0014] 1. In this utility model, the threaded rod is rotated by a round handle, and the height is adjusted by the internal thread of the positioning seat, which drives the valve rod to move and connect the valve core to the switch. This avoids the valve core from suddenly closing and causing impact on the pipeline. At the same time, the position of the valve core can accurately control the channel size to adapt to different water flow requirements and reduce pipeline losses.

[0015] 2. In this utility model, the water flowing back from the drain pipe can be stored in the valve body, and the valve body buffers the backflow impact to prevent backflow; when replacing the threaded sleeve, only the positioning screw needs to be loosened to disassemble the relevant parts, and the magnetic attraction between the hexagonal stud magnetic block and the hexagonal groove can also ensure the adjustment effect, making maintenance and adjustment operations simple. Attached Figure Description

[0016] Figure 1 A three-dimensional structural diagram of a slow-closing anti-backflow check valve is provided for this utility model;

[0017] Figure 2 This utility model provides a schematic diagram of the internal structure of a slow-closing anti-backflow check valve;

[0018] Figure 3 This utility model presents a schematic diagram showing the internal structure of a slow-closing anti-backflow check valve.

[0019] Legend: 1. Valve body; 2. Inlet pipe; 3. Drain pipe; 4. Round handle; 5. Cover plate; 6. Valve core; 7. Conical sealing sleeve; 8. Valve stem; 9. Positioning seat; 10. Positioning screw; 11. Positioning hole; 12. Threaded rod; 13. Threaded sleeve; 14. Hexagonal stud; 15. Hexagonal groove. Detailed Implementation

[0020] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0022] Example 1: As Figure 1 - Figure 3 As shown, this utility model provides a slow-closing anti-backflow check valve, including a valve body 1. The surface of the valve body 1 is connected to an inlet pipe 2 and a drain pipe 3. A conical sealing sleeve 7 is provided inside the valve body 1. A valve stem 8 is movably connected to the center of the conical sealing sleeve 7. A valve core 6 is provided at the bottom end of the valve stem 8. A threaded rod 12 is connected to the top end of the valve stem 8. A cover plate 5 is fixedly connected to the top end of the conical sealing sleeve 7. A positioning seat 9 is installed at the center of the cover plate 5. The threaded rod 12 is threadedly connected to the positioning seat 9.

[0023] The specific settings and functions of this embodiment are described below. The check valve is installed on the pipeline. Water flows into the valve body 1 from the inlet pipe 2 and then out through the valve body 1 to the drain pipe 3. The valve core 6 is located at the connection between the valve body 1 and the inlet pipe 2. Its position determines the size of the internal channel. The position of the valve core 6 is controlled by the valve stem 8. By rotating the threaded rod 12, its height is adjusted by the internal thread of the positioning seat 9, achieving the effect of moving up and down. The valve core 6 is opened or closed by the threaded connection, achieving the effect of slow closing. When the valve core 6 is closed, the inlet pipe 2 and the drain pipe 3 are separated. Due to the sudden closure, the water in the drain pipe 3 flows back. The backflowed water is stored inside the valve body 1. The valve body 1 is used to buffer the impact force of the backflow, achieving the effect of preventing backflow.

[0024] Example 2: Figure 2 and Figure 3 As shown, a hexagonal groove 15 is provided at the top of the valve stem 8, and a hexagonal stud 14 is fixedly connected to the bottom of the threaded rod 12. A round handle 4 is fixedly connected to the top of the threaded rod 12, and a protective sleeve is provided on the outer wall of the round handle 4. Screws are provided on the outer periphery of the cover plate 5, and the cover plate 5 is installed on the valve body 1 by the screws.

[0025] Positioning screws 10 are provided on both sides of the positioning seat 9, and the positioning seat 9 is detachably connected to the cover plate 5 through the positioning screws 10. A positioning hole 11 is installed in the center of the positioning seat 9, and a threaded sleeve 13 is slidably connected inside the positioning hole 11. A flat key is provided on the inner wall of the positioning hole 11, and a flat keyway with a matching shape is provided on the outer wall of the threaded sleeve 13. The threaded sleeve 13 is threadedly connected to the threaded rod 12.

[0026] The overall effect of this embodiment is as follows: In order to adjust the closing speed of the valve core 6, a replaceable threaded sleeve 13 is provided at the center of the positioning seat 9. A flat keyway is provided on the outer side of the threaded sleeve 13. A corresponding positioning hole 11 is opened at the center of the positioning seat 9, and the flat key in the positioning hole 11 is engaged with it. A retaining ring is provided at the bottom of the positioning hole 11 to prevent the threaded sleeve 13 from coming off the bottom of the positioning hole 11. When replacing the threaded sleeve 13, the positioning screws 10 on both sides of the positioning seat 9 are loosened, and the positioning seat 9, along with the threaded sleeve 13 and the threaded rod 12, are removed. At this time, the threaded rod 12 is separated from the valve stem 8, and the hexagonal stud 14 is completely dislodged from the hexagonal groove 15. A magnetic block is installed at the bottom of the hexagonal stud 14, and it can be connected to the hexagonal groove 15 by magnetic attraction. When the threaded connection is made, the valve stem 8 and the threaded rod 12 are subjected to magnetic attraction to ensure the adjustment effect. A round handle 4 is provided at the top of the threaded rod 12 to facilitate the control of the rotation of the threaded rod 12 by holding the round handle 4.

[0027] The device's operation and working principle are as follows: During operation, water flows into valve body 1 through inlet pipe 2 and exits through drain pipe 3. Valve core 6 is located at the interface between valve body 1 and inlet pipe 2, and its position is controlled by valve stem 8, determining the channel size. A round handle 4 with a protective sleeve is installed at the top of threaded rod 12. By rotating the round handle 4, the height of threaded rod 12 is adjusted using the internal thread of positioning seat 9 on cover plate 5, causing valve stem 8 to move. This movement, via threaded connection, switches valve core 6, achieving slow closing. After valve core 6 closes, inlet pipe 2 and drain pipe 3 are isolated. Backflow water from drain pipe 3 is stored inside valve body 1, which buffers impacts to prevent backflow. To adjust the closing speed of valve core 6, a threaded sleeve 13 with a keyway is installed at the center of positioning seat 9. The inner wall of positioning hole 11 has a key and a retaining ring at the bottom. The key and the keyway engage to prevent the threaded sleeve 13 from falling off. When replacing, loosen positioning screw 10, remove positioning seat 9, threaded sleeve 13 and threaded rod 12, so that the hexagonal stud 14 with magnetic block disengages from hexagonal groove 15. Magnetic attraction ensures the adjustment effect. Cover plate 5 is installed on valve body 1 with screws, and the whole unit works together to achieve the function.

[0028] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A slow-closing backflow-preventing check valve comprising a valve housing (1), a water inlet pipe (2) and a water outlet pipe (3) being communicated with the surface of the valve housing (1), characterized in that: The valve body (1) is provided with a conical sealing sleeve (7) inside. A valve stem (8) is movably connected to the center of the conical sealing sleeve (7). A valve core (6) is provided at the bottom end of the valve stem (8). A threaded rod (12) is connected to the top end of the valve stem (8). A cover plate (5) is fixedly connected to the top end of the conical sealing sleeve (7). A positioning seat (9) is installed at the center of the cover plate (5). The threaded rod (12) is threadedly connected to the positioning seat (9).

2. A slow-close backflow preventer check valve according to claim 1, wherein: The valve stem (8) has a hexagonal groove (15) at the top and a hexagonal stud (14) fixedly connected to the bottom of the threaded rod (12).

3. A slow-close backflow preventer check valve according to claim 1, wherein: The top end of the threaded rod (12) is fixedly connected to a round handle (4), and a protective sleeve is provided on the outer side wall of the round handle (4).

4. A slow-close backflow preventer check valve according to claim 1, wherein: The cover plate (5) is provided with screws on its outer periphery, and the cover plate (5) is installed on the valve body (1) by the screws.

5. A slow-close backflow preventer check valve according to claim 1, wherein: Positioning screws (10) are provided on both sides of the positioning seat (9), and the positioning seat (9) is detachably connected to the cover plate (5) through the positioning screws (10).

6. A slow-close backflow preventer check valve according to claim 1, wherein: The positioning seat (9) has a positioning hole (11) installed at its center, and a threaded sleeve (13) is slidably connected inside the positioning hole (11).

7. A slow-close backflow preventer check valve according to claim 6, wherein: The inner wall of the positioning hole (11) is provided with a flat key, and the outer wall of the threaded sleeve (13) is provided with a flat keyway that matches its shape. The threaded sleeve (13) is threadedly connected to the threaded rod (12).

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