Anti-cavitation multi-stage pressure reducing regulating valve

Abstract

This utility model discloses a multi-stage pressure-reducing regulating valve for cavitation prevention, comprising a valve body. The valve body is characterized by a valve cover mounted on its top, an outlet pipe and an inlet pipe respectively located on opposite sides of the valve body, a valve seat mounted inside the valve body, a valve stem slidably fitted inside the valve body, a valve core corresponding to the valve seat mounted at the bottom end of the valve stem, a pneumatic actuator mounted on the top of the valve cover, and one end of the valve stem passing through the top of the valve body slidably fitted inside the valve cover and cooperating with the pneumatic actuator. The valve body contains a pressure-reducing inner cylinder and a pressure-reducing outer cylinder, with the outer wall of the inner cylinder and the inner wall of the outer cylinder in contact and in both sliding and rotating fit. This utility model, through the pressure-reducing inner and outer cylinders, enables the pressure-reducing inner and outer cylinders to reduce the pressure of the medium flowing within the valve body. This allows the medium to pass through multiple first and second through holes, and the first and second connecting grooves reduce the impact force of the medium, facilitating pressure reduction within the valve body and reducing cavitation.

Description

Technical Field

[0001] This utility model relates to the field of regulating valve technology, specifically to a multi-stage pressure reducing regulating valve with anti-cavitation properties. Background Technology

[0002] A control valve is a commonly used valve, whose main function is to regulate parameters such as pressure, flow rate, and temperature of the medium. The main structure of a control valve consists of a valve body, a valve seat, a valve core, and a valve cover. The valve seat is installed in the valve body and has a hollow cylindrical structure. The valve core is located in the valve seat, and the movement of the valve core relative to the valve seat can open or close the medium passage.

[0003] When existing control valves are in use, excessive pressure of the medium inside the valve body can cause the medium to impact the inside of the valve body, damaging the control valve and its related components and leading to cavitation. In order to avoid cavitation in control valves and improve their service life, it is urgent to design a cavitation-resistant multi-stage pressure-reducing control valve to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a multi-stage pressure reducing regulating valve to prevent cavitation, thereby addressing the aforementioned shortcomings in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A cavitation-resistant multi-stage pressure-reducing regulating valve includes a valve body, characterized in that a valve cover is installed on the top of the valve body, an outlet pipe and an inlet pipe are respectively provided on opposite sides of the valve body, a valve seat is installed inside the valve body, a valve stem is slidably fitted inside the valve body, a valve core corresponding to the valve seat is installed at the bottom end of the valve stem, a pneumatic actuator is provided on the top of the valve cover, and one end of the valve stem passing through the top of the valve body is slidably fitted inside the valve cover and cooperates with the pneumatic actuator; a pressure-reducing inner cylinder and a pressure-reducing... The outer cylinder has a sliding and rotating fit with the outer wall of the pressure-reducing inner cylinder. The outer wall of the pressure-reducing inner cylinder has multiple first through holes on its circumference, and the outer cylinder has multiple second through holes on its circumference. The outer wall of the pressure-reducing inner cylinder has first connecting grooves corresponding to the multiple first through holes, and the inner wall of the pressure-reducing outer cylinder has second connecting grooves corresponding to the multiple second through holes. The multiple first connecting grooves correspond to the multiple second connecting grooves respectively. An adjustment mechanism is provided between the valve stem and the pressure-reducing outer cylinder.

[0007] Furthermore, a fixing bracket is installed on the top of the valve cover, the pneumatic actuator is installed on the top of the fixing bracket, a scale mark is installed on one side of the inner wall of the fixing bracket, a pointer corresponding to the scale mark is provided inside the valve stem, and a slide is provided on the other side of the inner wall of the fixing bracket, with one end of the pointer slidingly engaged in the slide.

[0008] Furthermore, the adjustment mechanism includes two adjustment grooves formed on opposite sides of the inner wall of the pressure-reducing outer cylinder and an adjustment rod disposed in the valve stem, with both ends of the adjustment rod slidingly engaging with the two adjustment grooves respectively.

[0009] Furthermore, a noise reduction frame is installed at the bottom of the valve seat, and multiple noise reduction holes are provided at the bottom and around the perimeter of the noise reduction frame.

[0010] Furthermore, a sealing gasket is provided between the valve seat and the pressure-reducing inner cylinder, and a sealing ring is provided inside the valve body, the sealing ring abutting against the pressure-reducing outer cylinder.

[0011] Furthermore, the bottom of the pressure-reducing inner cylinder is provided with a frustum bottom ring, and the top of the frustum bottom ring is provided with an annular groove, the bottom end of the pressure-reducing outer cylinder corresponding to the annular groove.

[0012] In the above technical solution, the cavitation-resistant multi-stage pressure-reducing regulating valve provided by this utility model has the following beneficial effects:

[0013] The pressure-reducing inner and outer cylinders reduce the pressure of the medium flowing through the valve body, allowing the medium to pass through multiple first and second through holes. This reduces the impact force of the medium on the first and second connecting grooves, facilitating pressure reduction within the valve body and minimizing cavitation. The adjustable mechanism, activated when the pneumatic actuator drives the valve stem and valve core upwards, causes the valve stem to adjust the mechanism, which in turn rotates the pressure-reducing outer cylinder. This adjusts the distance between the first and second connecting grooves, further reducing the impact of the medium on the valve body. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0015] Figure 1 This is a schematic diagram of the pressure-reducing regulating valve structure provided for an embodiment of the anti-cavitation multi-stage pressure-reducing regulating valve of this utility model.

[0016] Figure 2 This is a schematic diagram of the valve body structure provided for an embodiment of the anti-cavitation multi-stage pressure reducing regulating valve of this utility model.

[0017] Figure 3 This is a schematic diagram of the pressure-reducing outer cylinder structure provided for an embodiment of the anti-cavitation multi-stage pressure-reducing regulating valve of this utility model.

[0018] Figure 4 This is a schematic diagram of the pressure-reducing inner cylinder structure provided for an embodiment of the anti-cavitation multi-stage pressure-reducing regulating valve of this utility model.

[0019] 1. Valve body; 2. Valve cover; 3. Outlet pipe; 4. Inlet pipe; 5. Valve seat; 6. Valve stem; 7. Valve core; 8. Pneumatic actuator; 9. Pressure-reducing inner cylinder; 10. Pressure-reducing outer cylinder; 11. First through hole; 12. Second through hole; 13. First connecting groove; 14. Second connecting groove; 15. Adjusting mechanism; 16. Fixing bracket; 17. Scale marking; 18. Pointer; 19. Slide rail; 20. Adjusting groove; 21. Adjusting rod; 22. Noise reduction frame; 23. Noise reduction hole; 24. Sealing gasket; 25. Sealing ring; 26. Frustum bottom ring; 27. Annular groove. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0021] like Figure 1-4 As shown in the figure, this utility model provides a multi-stage pressure reducing regulating valve for preventing cavitation.

[0022] The valve body includes a valve body 1, characterized in that a valve cover 2 is installed on the top of the valve body 1, an outlet pipe 3 and an inlet pipe 4 are respectively provided on opposite sides of the valve body 1, a valve seat 5 is installed inside the valve body 1, a valve stem 6 is slidably fitted inside the valve body 1, a valve core 7 corresponding to the valve seat 5 is installed at the bottom end of the valve stem 6, a pneumatic actuator 8 is provided on the top of the valve cover 2, and one end of the valve stem 6 passing through the top of the valve body 1 is slidably fitted inside the valve cover 2 and cooperates with the pneumatic actuator 8; a pressure-reducing inner cylinder 9 and a pressure-reducing outer cylinder 10 are provided inside the valve body 1, and the outer wall of the pressure-reducing inner cylinder 9... The pressure-reducing inner cylinder 9 is fitted to the inner wall of the pressure-reducing outer cylinder 10 and has both sliding and rotating fits. The pressure-reducing inner cylinder 9 has multiple first through holes 11 on its periphery, and the pressure-reducing outer cylinder 10 has multiple second through holes 12 on its periphery. The pressure-reducing inner cylinder 9 has first connecting grooves 13 corresponding to the multiple first through holes 11 on its periphery. The pressure-reducing outer cylinder 10 has second connecting grooves 14 corresponding to the multiple second through holes 12 on its inner wall. The multiple first connecting grooves 13 correspond to the multiple second connecting grooves 14 respectively. An adjustment mechanism 15 is provided between the valve stem 6 and the pressure-reducing outer cylinder 10.

[0023] Reference Figure 1In this embodiment, a mounting bracket 16 is installed on the top of the valve cover 2, and a pneumatic actuator 8 is mounted on the top of the mounting bracket 16. A scale mark 17 is installed on one side of the inner wall of the mounting bracket 16, and a pointer 18 corresponding to the scale mark 17 is provided inside the valve stem 6. A slide rail 19 is provided on the other side of the inner wall of the mounting bracket 16, and one end of the pointer 18 slides within the slide rail 19. Through the scale mark 17, when the pneumatic actuator 8 drives the valve stem 6 to move upward, the valve stem 6 will drive the pointer 18 to move upward, causing the pointer 18 to move to the corresponding scale mark 17 for display, showing the rising position of the valve stem 6. The slide rail 19 allows the pointer 18 to move stably up and down.

[0024] Reference Figure 2 The adjustment mechanism 15 in this embodiment includes two adjustment grooves 20 formed on opposite sides of the inner wall of the pressure-reducing outer cylinder 10, and an adjustment rod 21 disposed within the valve stem 6. The two ends of the adjustment rod 21 are slidably engaged with the two adjustment grooves 20 respectively. When the valve stem 6 moves upward, the valve stem 6 drives the adjustment rod 21 to move upward, causing the two ends of the adjustment rod 21 to rotate along the adjustment grooves 20, thereby adjusting the pressure reduction effect between the pressure-reducing outer cylinder 10 and the pressure-reducing inner cylinder 9.

[0025] Reference Figure 2 In this embodiment, a noise reduction frame 22 is installed at the bottom of the valve seat 5. Multiple noise reduction holes 23 are provided on the bottom and periphery of the noise reduction frame 22. Through the noise reduction frame 22, after the medium passes through the valve seat 5, the noise reduction frame 22 will reduce noise, and the multiple noise reduction holes 23 will reduce the speed of the fluid medium, thereby achieving the effect of reducing noise.

[0026] Reference Figure 2 In this embodiment, a sealing gasket 24 is provided between the valve seat 5 and the pressure-reducing inner cylinder 9, and a sealing ring 25 is provided inside the valve body 1, which abuts against the pressure-reducing outer cylinder 10. Through the provided sealing gasket 24 and sealing ring 25, the pressure-reducing inner cylinder 9 and the pressure-reducing outer cylinder 10 can be sequentially placed into the valve body 1, with the bottom of the pressure-reducing inner cylinder 9 abutting against the valve seat 5. The sealing gasket 24 seals the connection between the pressure-reducing inner cylinder 9 and the valve seat 5. Then, the pressure-reducing outer cylinder 10 presses against the pressure-reducing inner cylinder 9 to fix it, and the protruding circumference of the pressure-reducing outer cylinder 10 abuts against the sealing ring 25 for sealing. Finally, the valve cover 2 is installed and fixed.

[0027] Reference Figure 3 In this embodiment, the bottom of the pressure-reducing inner cylinder 9 is provided with a frustum-shaped bottom ring 26, and the top of the frustum-shaped bottom ring 26 is provided with an annular groove 27. The bottom end of the pressure-reducing outer cylinder 10 corresponds to the annular groove 27. Through the annular groove 27, when the pressure-reducing inner cylinder 9 enters the pressure-reducing outer cylinder 10, the bottom end of the pressure-reducing outer cylinder 10 will enter the annular groove 27, making the pressure-reducing inner cylinder 9 and the pressure-reducing outer cylinder 10 fit more tightly, resulting in a better pressure reduction effect.

[0028] The sealing ring 25 and the frustum bottom ring 26 can be made of rubber and can be replaced for sealing and installation / removal.

[0029] Working principle: In use, first connect the outlet pipe 3 and the inlet pipe 4 to the external pipeline to allow the medium to flow in the valve body 1. The pneumatic actuator 8 drives the valve stem 6 and valve core 7 to move up and down, which can open or close the valve body 1. When the medium flows in the valve body 1, the pressure-reducing inner cylinder 9 and the pressure-reducing outer cylinder 10 reduce the pressure of the medium. The medium first passes through the second through hole 12 of the pressure-reducing outer cylinder 10 and enters the connection between the first connecting groove 13 and the second connecting groove 14 through the second through hole 12. This reduces the impact force of the medium in the first connecting groove 13 and the second connecting groove 14. Then the medium flows out from the first through hole 11, passes through the valve seat 5 and is discharged through the outlet pipe 3. The upward movement of the valve stem 6 will activate the adjusting mechanism 15, which will drive the pressure-reducing outer cylinder 10 to rotate. The rotation of the pressure-reducing outer cylinder 10 will adjust the distance between the first connecting groove 13 and the second connecting groove 14. The pressure-reducing outer cylinder 10 can also be rotated to align the first through hole 11 with the second through hole 12. Multi-stage pressure reduction adjustment can be performed as needed.

[0030] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A multi-stage pressure reducing valve with anti-cavitation, comprising a valve body (1), characterized in that, A valve cover (2) is installed on the top of the valve body (1). An outlet pipe (3) and an inlet pipe (4) are respectively provided on opposite sides of the valve body (1). A valve seat (5) is installed inside the valve body (1). A valve stem (6) is slidably fitted inside the valve body (1). A valve core (7) corresponding to the valve seat (5) is installed at the bottom end of the valve stem (6). A pneumatic actuator (8) is provided on the top of the valve cover (2). One end of the valve stem (6) passing through the top of the valve body (1) is slidably fitted inside the valve cover (2) and cooperates with the pneumatic actuator (8). A pressure-reducing inner cylinder (9) and a pressure-reducing outer cylinder (10) are provided inside the valve body (1). The pressure-reducing inner cylinder (9) The outer wall is in close contact with the inner wall of the pressure-reducing outer cylinder (10) and has sliding and rotational fits. The pressure-reducing inner cylinder (9) has multiple first through holes (11) on its periphery, and the pressure-reducing outer cylinder (10) has multiple second through holes (12) on its periphery. The pressure-reducing inner cylinder (9) has a first connecting groove (13) corresponding to the multiple first through holes (11) on its periphery. The pressure-reducing outer cylinder (10) has a second connecting groove (14) corresponding to the multiple second through holes (12) on its inner wall. The multiple first connecting grooves (13) correspond to the multiple second connecting grooves (14) respectively. An adjustment mechanism (15) is provided between the valve stem (6) and the pressure-reducing outer cylinder (10).

2. The anti-icing multi-stage pressure reducing regulator valve according to claim 1, wherein, A mounting bracket (16) is installed on the top of the valve cover (2). The pneumatic actuator (8) is installed on the top of the mounting bracket (16). A scale mark (17) is installed on one side of the inner wall of the mounting bracket (16). A pointer (18) corresponding to the scale mark (17) is provided inside the valve stem (6). A slide rail (19) is provided on the other side of the inner wall of the mounting bracket (16). One end of the pointer (18) slides in the slide rail (19).

3. The anti-cavitation multi-stage pressure reducing regulating valve according to claim 1, characterized in that, The adjustment mechanism (15) includes two adjustment grooves (20) opened on opposite sides of the inner wall of the pressure reducing outer cylinder (10) and an adjustment rod (21) set in the valve stem (6). The two ends of the adjustment rod (21) are respectively slidably engaged with the two adjustment grooves (20).

4. The anti-cavitation multi-stage pressure reducing regulating valve according to claim 1, characterized in that, The bottom of the valve seat (5) is equipped with a noise reduction frame (22), and the bottom and periphery of the noise reduction frame (22) are provided with multiple noise reduction holes (23).

5. The anti-cavitation multi-stage pressure reducing regulating valve according to claim 1, characterized in that, A sealing gasket (24) is provided between the valve seat (5) and the pressure-reducing inner cylinder (9), and a sealing ring (25) is provided inside the valve body (1), and the sealing ring (25) abuts against the pressure-reducing outer cylinder (10).

6. The anti-cavitation multi-stage pressure reducing regulating valve according to claim 1, characterized in that, The bottom of the pressure-reducing inner cylinder (9) is provided with a frustum bottom ring (26), and the top of the frustum bottom ring (26) is provided with an annular groove (27). The bottom end of the pressure-reducing outer cylinder (10) corresponds to the annular groove (27).

Images