Check valve with adjustable opening degree

By designing an adjustable check valve and utilizing a combination of regulating components and check devices, the problem of inaccurate flow control in existing check valves is solved, achieving precise flow regulation and passive shut-off, thus improving the safety and stability of the equipment.

CN223868614UActive Publication Date: 2026-02-03SHANGHAI YIHE VALVE CO LTD
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Patent Information

Application Number
CN202520301580.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-02-25
Publication Date
2026-02-03
Estimated Expiration
2035-02-25

AI Technical Summary

Technical Problem

Existing check valves may fail to open at low flow rates, or their opening height may be inappropriate at certain flow rates, resulting in inaccurate flow control and affecting equipment safety and stability.

Method used

An adjustable check valve was designed. By combining the adjustment component and the check device, the check device can be quickly closed by the action of the tension spring. Combined with the scale line, the flow rate can be precisely controlled to prevent fluid backflow.

Benefits of technology

It enables precise flow regulation and passive shutdown, improving the safety and stability of the equipment, preventing fluid backflow, and reducing equipment damage.

✦ Generated by Eureka AI based on patent content.

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    Figure CN223868614U_ABST
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Abstract

The check valve comprises a valve body, an input port is formed in the left portion of the valve body, an output port is formed in the right end of the valve body, a cavity is formed in the middle of the valve body, a valve deck is connected to the upper end of the valve body through a bolt, and an adjusting assembly is connected to the upper portion of an inner cavity of the valve deck in a sliding mode. The lower portion of an inner cavity of the valve deck is slidably connected with a non-return device, the lower portion of the adjusting assembly and the upper portion of the non-return device are jointly and fixedly connected with a tension spring, the upper portion of the inner cavity of the valve deck is slidably connected with a gland, and an inner cavity of the gland is rotatably connected with a valve rod nut. According to the check valve with the adjustable opening degree, fluid backflow can be effectively prevented through the designed check device, equipment can be protected against damage caused by backflow, safety and stability of the equipment are improved, passive closing of the check device is achieved under the action of the tension spring, and the check valve with the adjustable opening degree is safe and reliable. The non-return device can be quickly closed to prevent fluid from flowing back.
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Description

Technical Field

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

[0002] A check valve, also known as a non-return valve, one-way valve, backflow valve, or isolation valve, is a type of valve whose opening and closing element (valve disc) is circular and whose action is generated by its own weight and the pressure of the medium to prevent the backflow of the medium.

[0003] Most check valves currently used on the market are on / off type valves. When the valve inlet flow is small, the weight of the valve disc itself may prevent it from opening. Or, when the inlet flow is constant, the valve disc opening height may be too small or too large. Therefore, an adjustable check valve is needed. Utility Model Content

[0004] The main purpose of this invention is to provide a check valve with adjustable opening, which can effectively solve the problems mentioned above.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] An adjustable check valve includes a valve body with an inlet on the left and an outlet on the right. A cavity is formed in the middle of the valve body. A valve cover is bolted to the upper end of the valve body. An adjusting assembly is slidably connected to the upper part of the valve cover's inner cavity. A check device is slidably connected to the lower part of the valve cover's inner cavity. A tension spring is fixedly connected to the lower part of the adjusting assembly and the upper part of the check device. A pressure cap is slidably connected to the upper part of the valve cover's inner cavity. A valve stem nut is rotatably connected to the inner cavity of the pressure cap. A locking nut is threaded onto the upper part of the outer surface of the valve stem nut. A bearing is provided between the lower outer ring of the valve stem nut and the bottom wall of the valve cover.

[0007] Preferably, the valve stem nut is threadedly connected to the adjusting assembly.

[0008] Preferably, the input port is connected to the cavity, and the cavity is connected to the output port.

[0009] Preferably, the check valve includes a valve disc and an O-ring. The valve disc slides in the lower part of the inner cavity of the valve cover. A sealing ring is slidably connected to the lower end of the valve disc. A pressure ring is slidably connected to the lower end of the sealing ring. A bolt is threadedly connected to the middle of the pressure ring. A stop washer is slidably connected to the lower part of the outer surface of the pressure cover. The O-ring is located at the upper end of the sealing ring and is connected to the valve disc.

[0010] Preferably, the bolt passes through the lower middle part of the sealing ring and extends into the interior of the valve disc, and the bolt is threadedly connected to the valve disc.

[0011] Preferably, the outer ring at the upper end of the valve disc is fixedly connected to the tension spring.

[0012] Preferably, the adjusting assembly includes an adjusting valve stem, which is threaded to the inner cavity of a valve stem nut. The upper part of the outer surface of the adjusting valve stem is plated with scale lines, and a sliding sleeve is fixedly connected to the lower part of the outer surface of the adjusting valve stem. O-rings are fixedly connected to both the upper and lower parts of the outer surface of the sliding sleeve.

[0013] Preferably, the sliding sleeve is slidably connected to the upper part of the inner cavity of the valve cover, and the lower outer ring of the regulating valve rod is fixedly connected to the tension spring.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. This device, through its designed adjustment components, can adjust the size of the check valve opening, thereby controlling the flow rate of the fluid passing through. Users can adjust the opening of the check valve according to actual conditions to meet specific flow and pressure requirements.

[0016] 2. This device, through its designed check valve, can effectively prevent fluid backflow, helping to protect the equipment from damage caused by backflow and improving the safety and stability of the equipment. Under the action of the tension spring, the check valve can achieve passive closure, which can quickly close the check valve to prevent fluid backflow, further improving the safety and stability of the equipment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic cross-sectional view of the overall structure of this utility model;

[0019] Figure 3 This is a plan view of the overall structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the check valve structure of this utility model;

[0021] Figure 5 This is a schematic diagram of the adjustment component structure of this utility model.

[0022] The following are labeled in the diagram: 1. Valve body; 2. Inlet; 3. Cavity; 4. Valve cover; 5. Gland; 6. Lock nut; 7. Adjusting assembly; 8. Outlet; 9. Check valve; 10. Valve stem nut; 11. Tension spring; 12. Bearing; 91. Valve disc; 92. O-ring one; 93. Sealing ring; 94. Pressure ring; 95. Bolt; 96. Stop washer; 71. Scale line; 72. Adjusting valve stem; 73. Sliding sleeve; 74. O-ring two. Detailed Implementation

[0023] 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.

[0024] Example 1

[0025] like Figure 1 , Figure 2 and Figure 3 As shown, an adjustable check valve includes a valve body 1, an inlet 2 on the left side of the valve body 1, an outlet 8 on the right side of the valve body 1, a cavity 3 in the middle of the valve body 1, a valve cover 4 bolted to the upper end of the valve body 1, an adjusting component 7 slidably connected to the upper part of the inner cavity of the valve cover 4, a check device 9 slidably connected to the lower part of the inner cavity of the valve cover 4, a tension spring 11 fixedly connected to the lower part of the adjusting component 7 and the upper part of the check device 9, a pressure cover 5 slidably connected to the upper part of the inner cavity of the valve cover 4, a valve stem nut 10 rotatably connected to the inner cavity of the pressure cover 5, a locking nut 6 threadedly connected to the upper part of the outer surface of the valve stem nut 10, and a bearing 12 provided between the lower outer ring of the valve stem nut 10 and the bottom wall of the valve cover 4.

[0026] Furthermore, the valve stem nut 10 is threadedly connected to the adjusting assembly 7;

[0027] Furthermore, the input port 2 is connected to the cavity 3, and the cavity 3 is connected to the output port 8.

[0028] This device is mainly used in nuclear power plants to prevent backflow of media in nuclear power plant pipelines and reduce the impact of water hammer effect.

[0029] Before implementation, the installation steps for this device are as follows:

[0030] First, place the check valve 9, tension spring 11, and adjusting assembly 7 inside the valve cover 4. Then, combine the valve cover 4, check valve 9, tension spring 11, and adjusting assembly 7 and place them on the upper end of the valve body 1. After placement, connect them with bolts. Next, place the bearing 12 inside the valve cover 4. Then, screw the valve stem nut 10 into the valve cover 4 through the threaded connection with the adjusting assembly 7. The lower end of the valve stem nut 10 should fit against the bearing 12. Next, place the pressure cap 5 inside the valve cover 4. The inner cavity of the pressure cap 5 should fit against the valve stem nut 10. After placement, connect the contact surfaces of the valve cover 4 and the pressure cap 5 with screws to fix the valve cover 4 and the pressure cap 5 together. Finally, connect the locking nut 6 to the outer surface of the valve stem nut 10 to complete the installation.

[0031] In the above device, the left and right ends of the valve body 1 are connected to the nuclear power plant pipeline. The installation position is such that the medium enters from the inlet 2. After installation, if you want to adjust the flow rate of the medium, you can first remove the locking nut 6, and then rotate the valve stem nut 10 with a wrench. The upper part of the valve stem nut 10 is a square head, so that the valve stem nut 10 can be rotated by rotating the wrench. When the valve stem nut 10 rotates, it will drive the regulating component 7 to move upward through the threaded connection with the regulating component 7. When the regulating component 7 moves upward, the check device 9 will move upward through the tension spring 11. When the check device 9 moves upward, the outer ring of the check device 9 cannot contact the lower end of the valve cover 4.

[0032] It should be noted that the tension of the tension spring 11 must be greater than the sum of the weight of the check device 9 and the frictional force generated by the check device 9 and the valve cover 4. When the adjusting component 7 moves upward, the check device 9 will move upward through the tension spring 11; otherwise, the check device 9 will remain stationary.

[0033] The specific implementation method is as follows:

[0034] When the medium enters from the inlet 2, it will enter the cavity 3 through the downward inclined hole design of the valve body 1. The medium will then flow from the cavity 3 into the outlet 8 and then out from the outlet 8.

[0035] When the medium flows back, it flows into the upper part of the cavity 3 through the upward inclined hole design of the output port 8, and then accumulates on the upper part of the check device 9. The pressure of the medium plus the gravity of the check device 9 will drive the check device 9 to move downward, so that the check device 9 closes the cavity 3, preventing the medium from flowing back into the input port 2, thus playing a check function.

[0036] In the above device, when the medium presses the check device 9 to move downward, the tension spring 11 will generate tension. When the medium backflow ends, the pressure exerted by the medium on the check device 9 will disappear, and the tension spring 11 will release the pressure. In addition, when the medium enters from the inlet 2, the check device 9 will move upward to its original position, so that the medium flows from the cavity 3 to the outlet 8 and flows out from the outlet 8.

[0037] In the above-mentioned device, the bearing 12 is used to facilitate the rotation of the valve stem nut 10, thereby achieving convenient operation.

[0038] In the above device, a gasket is provided between the valve cover 4 and the valve body 1. The gasket is used to seal the fit between the valve body 1 and the valve cover 4 to prevent the medium from leaking out.

[0039] In the above device, the locking nut 6 is used to lock the valve stem nut 10, preventing the valve opening from changing due to vibration or misoperation when the valve is switched to the required opening degree.

[0040] Example 2

[0041] Furthermore, in order to achieve the purpose of check device 9 in preventing backflow, refer to... Figure 4 The check device 9 includes a valve disc 91 and an O-ring 92. The valve disc 91 slides in the lower part of the inner cavity of the valve cover 4. A sealing ring 93 is slidably connected to the lower end of the valve disc 91. A pressure ring 94 is slidably connected to the lower end of the sealing ring 93. A bolt 95 is threadedly connected to the middle of the pressure ring 94. A stop washer 96 is slidably connected to the lower part of the outer surface of the pressure cover 5. The O-ring 92 is located at the upper end of the sealing ring 93 and is connected to the valve disc 91.

[0042] Furthermore, bolt 95 passes through the lower middle part of sealing ring 93 and extends into the interior of valve disc 91, and bolt 95 is threadedly connected to valve disc 91;

[0043] Furthermore, the upper outer ring of the valve disc 91 is fixedly connected to the tension spring 11.

[0044] The installation steps for the check device 9 in the above-mentioned device are as follows:

[0045] Place the sealing ring 93 in the inner cavity of the lower end of the valve disc 91, then place the pressure ring 94 in the inner cavity of the sealing ring 93, and then screw the bolt 95 into the pressure ring 94 and the valve disc 91, so that the sealing ring 93 is fixed in the inner cavity of the lower end of the valve disc 91 by the pressure ring 94 and the bolt 95.

[0046] In the above device, the locking washer 96 is used to prevent loosening.

[0047] In the above device, O-ring 92 is used for sealing ring 93 and valve disc 91 to prevent internal leakage of the medium.

[0048] In the above device, when the medium flows back, the medium will press the valve disc 91 to move downward, so that the valve disc 91 closes the flow between the output port 8 and the cavity 3, thus achieving the function of preventing backflow.

[0049] Furthermore, in order to achieve the purpose of rotating the valve stem nut 10, causing the adjusting component 7 to move upward, and driving the check device 9 upward via the tension spring 11, refer to... Figure 5 The regulating component 7 includes a regulating valve stem 72, which is threaded to the inner cavity of the valve stem nut 10. The upper part of the outer surface of the regulating valve stem 72 is plated with scale lines 71, and the lower part of the outer surface of the regulating valve stem 72 is fixedly connected to a sliding sleeve 73. Both the upper and lower parts of the outer surface of the sliding sleeve 73 are fixedly connected to O-rings 74.

[0050] Furthermore, the sliding sleeve 73 is slidably connected to the upper part of the inner cavity of the valve cover 4, and the lower outer ring of the adjusting valve rod 72 is fixedly connected to the tension spring 11.

[0051] In the above-mentioned device, before rotating the valve stem nut 10, the locking nut 6 must be removed first, and then the valve stem nut 10 is rotated. The valve stem nut 10 is connected to the regulating valve stem 72 by a thread, and the regulating valve stem 72 will move upward, so that it slides upward in the inner cavity of the valve cover 4 through the sliding sleeve 73. When the regulating valve stem 72 moves upward, the check device 9 is driven to move upward through the tension spring 11, so as to achieve the purpose of adjusting the flow of medium.

[0052] In the above device, O-ring 74 is used to adjust the seal between valve stem 72 and valve cover 4 to prevent the medium from leaking to the outside.

[0053] In the above device, the opening and closing status of the valve can be observed by observing the scale line 71, and the number of rotations of the valve stem nut 10 can be determined according to the required adjustment height based on the scale line 71.

[0054] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A check valve with adjustable opening, comprising a valve body (1), characterized in that: The valve body (1) has an input port (2) on the left side and an output port (8) on the right side. The valve body (1) has a cavity (3) in the middle. The valve body (1) is bolted to the upper end of the valve cover (4). The valve cover (4) has an adjusting component (7) slidably connected to the upper part of the inner cavity. The valve cover (4) has a check device (9) slidably connected to the lower part of the inner cavity. The adjusting component (7) and the check device (9) are fixedly connected together with a tension spring (11). The valve cover (4) has a pressure cap (5) slidably connected to the upper part of the inner cavity. The pressure cap (5) has a valve stem nut (10) rotatably connected to the inner cavity. The valve stem nut (10) has a locking nut (6) threaded on the upper part of the outer surface of the valve stem nut (10). A bearing (12) is provided between the lower outer ring of the valve stem nut (10) and the bottom wall of the valve cover (4).

2. The adjustable opening check valve according to claim 1, characterized in that: The valve stem nut (10) is threadedly connected to the adjusting assembly (7).

3. The adjustable opening check valve according to claim 1, characterized in that: The input port (2) is connected to the cavity (3), and the cavity (3) is connected to the output port (8).

4. The adjustable opening check valve according to claim 1, characterized in that: The check valve (9) includes a valve disc (91) and an O-ring (92). The valve disc (91) slides in the lower part of the inner cavity of the valve cover (4). A sealing ring (93) is slidably connected to the lower end of the valve disc (91). A pressure ring (94) is slidably connected to the lower end of the sealing ring (93). A bolt (95) is threadedly connected to the middle of the pressure ring (94). A stop washer (96) is slidably connected to the lower part of the outer surface of the pressure cover (5). The O-ring (92) is located at the upper end of the sealing ring (93) and is connected to the valve disc (91).

5. The adjustable opening check valve according to claim 4, characterized in that: The bolt (95) passes through the middle of the lower end of the sealing ring (93) and extends into the interior of the valve disc (91), and the bolt (95) is threadedly connected to the valve disc (91).

6. The adjustable opening check valve according to claim 4, characterized in that: The upper outer ring of the valve disc (91) is fixedly connected to the tension spring (11).

7. The adjustable opening check valve according to claim 1, characterized in that: The adjusting assembly (7) includes an adjusting valve stem (72), which is threaded into the inner cavity of the valve stem nut (10). The upper part of the outer surface of the adjusting valve stem (72) is plated with scale lines (71), and the lower part of the outer surface of the adjusting valve stem (72) is fixedly connected to a sliding sleeve (73). Both the upper and lower parts of the outer surface of the sliding sleeve (73) are fixedly connected to O-rings (74).

8. The adjustable opening check valve according to claim 7, characterized in that: The sliding sleeve (73) is slidably connected to the upper part of the inner cavity of the valve cover (4), and the lower outer ring of the regulating valve rod (72) is fixedly connected to the tension spring (11).