Fine-adjustment slow-closing axial-flow type check valve
By introducing a buffer spring and adjusting bolt into the axial flow check valve, the problems of pipeline pressure loss and difficulty in controlling the opening force caused by the reset spring are solved, achieving precise control of the valve disc and avoiding water hammer.
Patent Information
- Application Number
- CN202520489214.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-20
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2035-03-20
AI Technical Summary
Existing axial flow check valves suffer from significant pipeline pressure loss due to the spring force of the reset spring, and the opening force is difficult to control.
A buffer spring is introduced into the valve disc structure. The preload of the buffer spring is adjusted by adjusting the bolt, which reduces the spring force of the reset spring. The buffer spring provides both assistance and resistance to control the opening force of the valve disc.
It reduces pipeline pressure loss, avoids water hammer, and achieves precise control of valve opening force.
Smart Images
Figure CN223794767U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of valve technology, and in particular to a fine-tuning slow-closing axial flow check valve. Background Technology
[0002] Existing axial flow check valves have a return spring on one side of the valve disc. The return spring contracts under fluid pressure, opening the valve disc and allowing fluid to flow from the inlet to the outlet. As the fluid pressure decreases, the return spring forces the valve disc to close automatically, preventing backflow. However, the spring force of the return spring can also cause significant pressure loss in the pipeline, and the opening force is difficult to control. Utility Model Content
[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a finely tuned slow-closing axial flow check valve that reduces pipeline pressure loss and facilitates control of the opening force.
[0004] To achieve the above objectives, the technical solution adopted by the fine-tuning slow-closing axial flow check valve of this utility model is as follows:
[0005] A fine-tuning, slow-closing axial flow check valve includes a valve body, a valve seat in the middle of the valve body, a valve disc on one side of the valve seat, a rear valve stem on one side of the valve disc, a rear valve sleeve fitted onto the outer side of the rear valve stem, the rear valve sleeve being fixedly connected to the valve body, a return spring fitted onto the outer side of the rear valve stem between the rear valve sleeve and the valve disc, the return spring driving the valve disc to block the valve seat, a front valve sleeve on the other side of the valve seat, the front valve sleeve being fixedly connected to the valve body, the front valve sleeve having a front pressure plate and a rear pressure plate, a buffer spring between the front and rear pressure plates, the valve disc having a front valve stem for pushing the rear pressure plate, an adjusting bolt threaded onto the front valve sleeve, the adjusting bolt pressing the front pressure plate and applying the spring force of the buffer spring to the rear pressure plate that is in contact with the front valve stem, the spring force of the buffer spring being less than the spring force of the return spring.
[0006] Preferably, the front valve sleeve includes a front annular body fixed to the inner circumferential surface of the valve body. The front annular body is connected to a tube for accommodating the front and rear pressure plates and the buffer spring through a number of spaced front stiffeners. A plug is detachably connected to the side of the tube near the front pressure plate, and an adjusting bolt is threaded to the plug.
[0007] Preferably, a cover is detachably connected to the outside of the plug, and the cover is bullet-shaped.
[0008] Preferably, a limiting boss is provided on one side of the inner wall of the tube to prevent the rear pressure plate from popping out.
[0009] Preferably, the front valve stem is provided with a rubber pad that abuts against the rear pressure plate.
[0010] Preferably, the rear valve sleeve includes a rear annular body fixed to the inner circumferential surface of the valve body, and the rear annular body is connected to a guide sleeve that slides with the rear valve stem through a plurality of spaced rear stiffeners.
[0011] Compared with the prior art, this utility model has the following advantages:
[0012] When fluid flows through, the buffer spring provides assistance to push the valve disc, thereby reducing pressure loss in the pipeline. After flow interruption, the buffer spring provides resistance to slow the valve disc's closing speed, preventing water hammer and damage to the pipeline valve. Furthermore, the preload of the buffer spring can be adjusted by regulating the bolt feed rate according to operating conditions, allowing for more precise control of the valve disc's opening force to meet usage requirements. Attached Figure Description
[0013] Figure 1 This is a cross-sectional view of this practical fine-tuning slow-closing axial flow check valve.
[0014] Figure 2 yes Figure 1 Enlarged view of point C.
[0015] Figure 3 This is a schematic diagram of the rear valve sleeve.
[0016] Figure 4 This is a schematic diagram of the front valve sleeve.
[0017] The components include: 1. Valve body; 11. Valve seat; 2. Valve disc; 21. Seal; 22. Rear valve stem; 23. Front valve stem; 231. Rubber gasket; 3. Rear valve sleeve; 31. Rear annular body; 32. Rear stiffener; 33. Guide sleeve; 4. Return spring; 5. Front valve sleeve; 51. Front annular body; 52. Front stiffener; 53. Pipe body; 531. Limiting boss; 54. Plug; 55. Cover; 6. Front pressure plate; 7. Rear pressure plate; 8. Buffer spring; 9. Adjusting bolt. Detailed Implementation
[0018] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.
[0019] like Figures 1 to 4As shown, a fine-tuning, slow-closing axial flow check valve includes a valve body 1, an integrally formed valve seat 11 in the middle of the valve body, a valve disc 2 installed on the right side of the valve seat, a sealing element 21 installed on the slope surface where the valve disc mates with the valve seat, a valve stem 22 integrally formed on the right end face of the valve disc, a rear valve sleeve 3 sleeved on the outer side of the rear valve stem, the rear valve sleeve including a rear annular body 31 fixed to the inner circumferential surface of the valve body, the rear annular body being connected to a guide sleeve 33 that slides with the rear valve stem through four spaced rear stiffeners 32, a return spring 4 sleeved on the outer side of the rear valve stem being installed between the guide sleeve and the valve disc, the return spring driving the valve disc to block the valve seat, a front valve sleeve 5 installed on the left side of the valve seat, the front valve sleeve including a front annular body 51 fixed to the inner circumferential surface of the valve body, the front annular body being connected to a pipe body 53 through four spaced front stiffeners 52, and a pipe body 53 being installed inside the pipe body. A front pressure plate 6 and a rear pressure plate 7 are installed, with a buffer spring 8 placed between them. A limiting boss 531 is integrally formed on the right inner wall of the pipe to prevent the rear pressure plate from popping out. A front valve stem 23 is integrally formed on the left side of the valve disc to push the rear pressure plate. A rubber pad 231 that abuts against the rear pressure plate is installed on the left end of the front valve stem. The rubber pad makes little noise when it abuts against the rear pressure plate. A plug 54 is detachably connected to the left side of the pipe. An adjusting bolt 9 passes through the center of the plug and is threaded to the plug. A retaining cover 55 is detachably connected to the outside of the plug. The retaining cover is bullet-shaped to prevent the fluid from directly scouring the adjusting bolt and causing it to loosen. The adjusting bolt squeezes the front pressure plate, which applies the spring force of the buffer spring to the rear pressure plate that is in contact with the rubber pad. The spring force of the buffer spring is less than that of the return spring.
[0020] The specific working process and principle of this utility model are as follows: According to the working conditions, the adjusting bolt is turned to change the compression length of the buffer spring, i.e., adjust the preload of the buffer spring. When fluid flows through, the buffer spring provides assistance to push the valve disc, allowing it to move smoothly to the right. The buffer spring extends, and the return spring is compressed. After the flow is cut off, the return spring extends, driving the valve disc to move to the left. During the compression process, the buffer spring provides resistance, slowing down the valve disc's closing speed and preventing water hammer damage to the pipeline valve. This utility model, by adding a buffer spring and adjusting its preload via the adjusting bolt, precisely controls the valve disc's opening force, reduces pipeline pressure loss, and effectively reduces the impact of water hammer. It has a simple structure and is easy to operate.
Claims
1. A fine tuning slow closing axial check valve characterized by: The valve body is provided with a valve seat in the middle, a valve clack on one side of the valve seat, a rear valve rod on one side of the valve clack, a rear valve sleeve sleeved on the outer side of the rear valve rod, the rear valve sleeve being fixedly connected with the valve body, a reset spring sleeved on the outer side of the rear valve rod between the rear valve sleeve and the valve clack, the reset spring driving the valve clack to block the valve seat, a front valve sleeve on the other side of the valve seat, the front valve sleeve being fixedly connected with the valve body, the front valve sleeve being provided with a front pressing plate and a rear pressing plate, a buffer spring between the front pressing plate and the rear pressing plate, the valve clack being provided with a front valve rod for extruding the rear pressing plate, the front valve sleeve being threadedly connected with an adjusting bolt, the adjusting bolt extruding the front pressing plate to apply the spring force of the buffer spring to the rear pressing plate abutting against the front valve rod, the spring force of the buffer spring being smaller than the spring force of the reset spring.
2. The fine tuning slow closing axial check valve of claim 1, wherein: The front valve sleeve comprises a front annular body fixedly connected with the inner circumferential surface of the valve body, the front annular body being connected with a pipe body for accommodating the front and rear pressing plates and the buffer spring through a plurality of spaced front rib plates, the pipe body being detachably connected with a plug cover on the side close to the front pressing plate, and the adjusting bolt being threadedly connected with the plug cover.
3. The fine tuning slow closing axial check valve of claim 2, wherein: The outer side of the plug cover is detachably connected with a cover, and the cover is in the shape of a bullet.
4. The fine adjustment slow closing axial check valve of claim 2, wherein: The inner wall of one side of the pipe body is provided with a limiting boss for preventing the rear pressing plate from being extruded.
5. The fine tuning slow closing axial check valve of claim 1, wherein: The front valve rod is provided with a rubber pad abutting against the rear pressing plate.
6. The fine tuning slow closing axial check valve of claim 1, wherein: The rear valve sleeve comprises a rear annular body fixedly connected with the inner circumferential surface of the valve body, and the rear annular body is connected with a guide sleeve for slidingly matching with the rear valve rod through a plurality of spaced rear rib plates.