Bidirectional check valve

Abstract

The utility model relates to the technical field of valves, and particularly discloses a two-way check valve which comprises a water inlet pipe and a water outlet pipe connected to one side of the water inlet pipe. A central pipe is fixedly connected into the water outlet pipe, valve plates are fixedly connected to the two ends of the central pipe, valve bodies are arranged on the sides, close to each other, of the two valve plates, the ends, away from each other, of the two valve bodies are connected with a positioning frame through movable rods, and the positioning frame is fixed into the water inlet pipe. A conical face is arranged on the side, close to the movable rod, of the valve body, a water passing hole is formed in the valve plate, and one side of the water passing hole abuts against the conical face. The two-way valve body is integrated through the single water inlet pipe, two-way liquid inlet is achieved, the same outlet is shared, a traditional double-outlet independent flow channel is omitted, external pipeline connection is simplified, leakage points are reduced, the plugging piece can plug the water outlet and control liquid flowing, and the two-way valve is suitable for emergency closure or system maintenance or control liquid flowing and the like.

Description

Technical Field

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

[0002] A two-way check valve is a specially designed valve whose core function is to allow fluid to flow in either of two directions while preventing reverse flow. This type of valve is widely used in applications requiring bidirectional flow control and prevention of backflow, such as hydraulic systems, water supply and drainage projects, and chemical processes. Internally, a two-way check valve has two independent fluid channels, each corresponding to one of the two flow directions. In existing two-way check valve designs, the inlet and outlet channels are interconnected, and the two outlet channels need to be connected separately.

[0003] For example, a bidirectional check valve disclosed in patent publication number CN222163649U includes a valve body with two inlet pipes for water inlet and outlet pipes for water outlet at the upper and lower ends of the valve body. Each of the two valve bodies, positioned relative to the inlet pipes, has a valve switch for controlling the flow within the inlet pipes. Two check elements are respectively installed at the positions of the two outlet pipes. A filter element for filtering the liquid in both outlet pipes is installed between the two outlet pipes. The check element includes a fixed seat, a check portion, a connecting seat, and a return spring.

[0004] The aforementioned bidirectional check valves, with their dual-inlet and dual-outlet design, require two independent check components and outlet pipes, increasing the fluid path and making external pipeline connections inconvenient. To address these issues, a new bidirectional check valve is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a bidirectional check valve to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A two-way check valve includes an inlet pipe and an outlet pipe connected to one side of the inlet pipe;

[0008] The outlet pipe is fixedly connected to the central pipe, and valve plates are fixedly connected to both ends of the central pipe. A valve body is provided on the side of the two sets of valve plates that are close to each other, and a positioning frame is connected to the side of the two sets of valve bodies that are far apart through a movable rod. The positioning frame is fixed inside the inlet pipe.

[0009] The valve body has a tapered surface on the side near the movable rod, and the valve plate has a water passage hole, with one side of the water passage hole abutting the tapered surface;

[0010] The central tube is provided with an outlet that is connected to the outlet pipe. An adjustable sealing element is installed inside the central tube to block the outlet and control the flow of liquid.

[0011] In one alternative: the movable rod includes a sleeve and a rod body slidably connected at one end within the sleeve, a return spring fixedly connected to one end of the rod body extending into the sleeve, a positioning frame fixedly connected to one end of the sleeve, and a valve body fixedly connected to one end of the rod body.

[0012] In one alternative: the area of ​​the circular surface of the valve body near the moving rod is smaller than the area of ​​the circular surface of the valve body away from the moving rod.

[0013] In one alternative: the sealing element includes a sealing core and a screw rotatably connected to one side of the sealing core; the central tube is provided with a sealing threaded sleeve that is threadedly connected to the screw; the outer wall of the water inlet pipe is provided with a through hole through which the sealing threaded sleeve passes; and the end of the screw away from the sealing core extends to the outside of the sealing threaded sleeve and is fixedly connected to a rotating handle.

[0014] In one alternative: the inner wall of the central tube is provided with a protrusion, the protrusion is provided with a through hole communicating with the water outlet, one side of the protrusion is provided with a contact plane that abuts against the sealing core, the side of the sealing core near the protrusion is the contact plane, and the side of the sealing core away from the protrusion is the arc-shaped surface.

[0015] In one alternative: the outer wall of the valve plate is fixedly attached to the inner wall of the inlet pipe.

[0016] In one alternative: both ends of the inlet pipe are connected to a first flange, and one end of the outlet pipe is connected to a second flange.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] In this utility model, a bidirectional valve body is integrated through a single water inlet pipe, enabling bidirectional liquid inlet to share the same outlet, eliminating the need for traditional dual-outlet independent flow channels, simplifying external pipeline connections, and reducing leakage points;

[0019] The sealing component in this invention can block the water outlet and control the liquid flow. It is suitable for emergency flow control or system maintenance, or for controlling the flow of liquid. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is a schematic diagram of the components installed inside the water inlet pipe in this utility model.

[0022] Figure 3 This is a schematic diagram of the sealing component in this utility model.

[0023] Figure 4 This is a schematic diagram of the movable rod in this utility model.

[0024] In the diagram: 1. Inlet pipe; 2. Outlet pipe; 3. Central pipe; 4. Outlet; 5. Valve plate; 6. Positioning bracket; 7. Valve body; 8. Movable rod; 9. Sealing core; 10. Protrusion; 11. Screw; 12. Rotating handle; 13. First flange; 14. Second flange; 15. Water passage hole; 801. Sleeve; 802. Rod body; 803. Return spring. Detailed Implementation

[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figures 1 to 4 In this embodiment, a bidirectional check valve includes an inlet pipe 1 and an outlet pipe 2 connected to one side of the inlet pipe 1; the inlet pipe 1 can be used for liquid input, and the outlet pipe 2 is used for liquid output, and different liquid input pipes can be connected to both sides of the inlet pipe 1 respectively.

[0028] The outlet pipe 2 is fixedly connected to the central pipe 3. Both ends of the central pipe 3 are fixedly connected to valve plates 5. The two sets of valve plates 5 are provided with valve bodies 7 on the side that is close to each other. The two sets of valve bodies 7 are connected to the positioning frame 6 through the movable rod 8. The positioning frame 6 is fixed inside the inlet pipe 1. The liquid entering the inlet pipe 1 can move the valve body 7 away from the valve plate 5 and enter the central pipe 3.

[0029] The valve body 7 has a tapered surface on the side near the movable rod 8, and the valve plate 5 has a water passage hole 15. One side of the water passage hole 15 is in contact with the tapered surface, and the movable rod 8 can pull the valve body 7 to reset.

[0030] The central pipe 3 is provided with an outlet 4 that is connected to the outlet pipe 2. An adjustable sealing element is installed inside the central pipe 3 to block the outlet 4 and control the flow of liquid. Liquid entering the central pipe 3 can flow to the outlet 4. The sealing element blocks the outlet 4 and controls the flow of liquid.

[0031] Please see Figure 2 and Figure 4 The movable rod 8 includes a sleeve 801 and a rod body 802 slidably connected at one end inside the sleeve 801. One end of the rod body 802 extending into the sleeve 801 is fixedly connected to a return spring 803 installed inside the sleeve 801. One end of the sleeve 801 is fixedly connected to a positioning frame 6, and one end of the rod body 802 is fixedly connected to a valve body 7.

[0032] Specifically, when liquid flows from the side of valve body 7 near the movable rod 8 into the central tube 3, the liquid flow impacts valve body 7, causing rod 802 to stretch return spring 803, allowing valve body 7 to move away from valve plate 5 and liquid to flow. After the liquid impact is removed, return spring 803 pulls valve body 7 to press tightly against valve plate 5. Conversely, when liquid flows from the side of valve body 7 away from the movable rod 8, it further impacts valve body 7 against valve plate 5, preventing flow. When there is no fluid pressure, return spring 803 pulls valve body 7 back to its original position via rod 802, ensuring a tight fit between valve body 7 and the conical surface of valve plate 5 to prevent internal leakage.

[0033] Please see Figure 4 The area of ​​the circular surface of the valve body 7 near the movable rod 8 is smaller than the area of ​​the circular surface of the valve body 7 away from the movable rod 8; specifically, when the valve body 7 moves towards the movable rod 8, it will be in close contact with the valve plate 5 due to the restriction of the conical surface, thus playing a role in preventing backflow.

[0034] Please see Figure 3 The sealing component includes a sealing core 9 and a screw 11 rotatably connected to one side of the sealing core 9. The central tube 3 is provided with a sealing threaded sleeve that is threadedly connected to the screw 11. The outer wall of the water inlet pipe 1 is provided with a through hole through which the sealing threaded sleeve passes. The end of the screw 11 away from the sealing core 9 extends to the outside of the sealing threaded sleeve and is fixedly connected to a rotating handle 12.

[0035] Specifically, by adjusting the rotation of the handle 12, the screw 11 can be rotated to adjust the position of the sealing core. The sealing core 9 blocks the outlet, which can cut off the flow of liquid entering from both sides of the inlet pipe 1 to the outlet pipe 2.

[0036] Please see Figure 3The inner wall of the central tube 3 is provided with a protrusion 10, and the protrusion 10 is provided with a through hole communicating with the water outlet 4. One side of the protrusion 10 is provided with a contact plane that abuts against the sealing core 9. The side of the sealing core 9 close to the protrusion 10 is the contact plane, and the side of the sealing core 9 away from the protrusion 10 is an arc-shaped surface.

[0037] Specifically, by rotating the screw 11, the position of the screw 11 on the sealing threaded sleeve can be adjusted, thereby adjusting the position of the sealing core 9. The contact surface of the sealing core 9 is in contact with the protruding contact surface, which can play a sealing role.

[0038] Furthermore, the outer wall of the valve plate 5 is fixed to the inner wall of the water inlet pipe 1, allowing the liquid entering the water inlet pipe 1 to pass through the valve plate 5.

[0039] Please see Figure 1 The inlet pipe 1 is connected to the first flange 13 at both ends, and the outlet pipe 2 is connected to the second flange 14 at one end; this facilitates connection with external pipelines.

[0040] In actual setup, sealing gaskets are provided on the contact plane of the sealing core 9 and the conical surface of the valve plate 5 to achieve stable sealing.

[0041] The working principle of this utility model is as follows: When liquid flows in from either end of the inlet pipe 1, the fluid impacts the valve body 7 away from the movable rod 8, the rod 802 of the movable rod 8 stretches the return spring 803, the valve body 7 and the conical surface of the valve plate 5 are no longer in contact, and the liquid flows into the central pipe 3 through the gap between the valve plate 5 and the valve body 7, and finally flows to the outlet pipe 2 through the outlet 4; under the impact of the liquid, the valve body 7 at the other end is pushed to move towards the movable rod 8, at which time the other set of valve bodies 7 is in close contact with the valve plate 5;

[0042] If reverse pressure attempts to flow back from the outlet pipe 2, the liquid will impact the valve body 7. At this time, the valve body 7 and the valve plate 5 are tightly pressed together, forming a seal and preventing backflow.

[0043] 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 technical solution of the present utility model.

Claims

1. A two-way check valve, comprising an inlet pipe (1) and an outlet pipe (2) connected to one side of the inlet pipe (1); Its features are: The outlet pipe (2) is fixedly connected to the center pipe (3), and both ends of the center pipe (3) are fixedly connected to the valve plate (5). The two sets of valve plates (5) are provided with valve bodies (7) on the side that is close to each other, and the two sets of valve bodies (7) are connected to the positioning frame (6) through the movable rod (8). The positioning frame (6) is fixed inside the inlet pipe (1). The valve body (7) has a tapered surface on the side near the movable rod (8), and the valve plate (5) has a water passage hole (15), with one side of the water passage hole (15) abutting against the tapered surface; The central tube (3) is provided with an outlet (4) that is connected to the outlet pipe (2). An adjustable sealing element is installed inside the central tube (3) to block the outlet (4) and control the flow of liquid.

2. The bidirectional check valve according to claim 1, characterized in that: The movable rod (8) includes a sleeve (801) and a rod body (802) with its end slidably connected inside the sleeve (801). One end of the rod body (802) extending into the sleeve (801) is fixedly connected to a return spring (803) installed inside the sleeve (801). One end of the sleeve (801) is fixedly connected to a positioning frame (6), and one end of the rod body (802) is fixedly connected to a valve body (7).

3. A bidirectional check valve according to claim 2, characterized in that: The area of ​​the circular surface of the valve body (7) near the movable rod (8) is smaller than the area of ​​the circular surface of the valve body (7) away from the movable rod (8).

4. A bidirectional check valve according to claim 1, characterized in that: The sealing component includes a sealing core (9) and a screw (11) rotatably connected to one side of the sealing core (9). The central tube (3) is provided with a sealing threaded sleeve that is threadedly connected to the screw (11). The outer wall of the water inlet pipe (1) is provided with a through hole through which the sealing threaded sleeve passes. The end of the screw (11) away from the sealing core (9) extends to the outside of the sealing threaded sleeve and is fixedly connected to a rotating handle (12).

5. A bidirectional check valve according to claim 4, characterized in that: The inner wall of the central tube (3) is provided with a protrusion (10), and the protrusion (10) is provided with a through hole communicating with the water outlet (4). One side of the protrusion (10) is provided with a contact plane that abuts against the sealing core (9). The side of the sealing core (9) close to the protrusion (10) is the contact plane, and the side of the sealing core (9) away from the protrusion (10) is an arc-shaped surface.

6. A bidirectional check valve according to claim 1, characterized in that: The outer wall of the valve plate (5) is fixedly attached to the inner wall of the water inlet pipe (1).

7. A bidirectional check valve according to claim 1, characterized in that: The inlet pipe (1) is connected to the first flange (13) at both ends, and the outlet pipe (2) is connected to the second flange (14) at one end.

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