A pressure-adjustable check valve

Abstract

This utility model discloses a pressure-adjustable check valve, including a valve body with flanges symmetrically fixed at both ends. In its initial state, the valve plate is sealed to the valve seat by a spring. Upon reaching the set pressure, the fluid pressure exceeds the spring force, pushing the valve plate away from the valve seat and allowing fluid to flow through the port and through-hole into the valve body. When adjusting the check valve's opening pressure, a hexagonal head drives a rotating shaft, which in turn drives a rotating frame via a first and second reversing gear. The rotating frame, through a threaded connection, moves a sleeve, which in turn moves an annular baffle. By adjusting the initial distance between the annular baffle and the valve plate, the spring compression is adjusted. This allows for direct adjustment of the check valve's opening pressure without disassembling the valve, effectively improving the adjustment efficiency of the pressure-adjustable check valve.

Description

Technical Field

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

[0002] Check valves are a type of automatic valve, also known as non-return valves, one-way valves, reflux valves, or isolation valves. When the inlet pressure is greater than the preset pressure of the valve disc, the valve is opened; conversely, when the medium flows backward, the valve is closed.

[0003] Current pressure-adjustable check valves, such as the one disclosed in publication number CN211474961U, include a flange, a straight pipe, a valve seat, a valve core, a rubber seat, a pressure plate, a spring, a bearing, a fixed seat, a lock nut, and a pressure adjusting seat. The flange, fixed seat, and valve seat are welded to the straight pipe. The pressure adjusting seat is threaded onto the fixed seat and secured to it with a lock nut. A bearing is mounted on the pressure adjusting seat, a spring is mounted on the bearing, the valve core is mounted on the spring, a rubber seat is mounted on the valve core, and a pressure plate is mounted on the rubber seat. The pressure plate and rubber seat are secured to the valve core with studs and nuts, and the rubber seat seals against the valve seat. This valve offers stable and reliable operation, a compact and simple structure, convenient operation and maintenance, and is economical and practical.

[0004] Existing pressure-adjustable check valves, while capable of adjusting the spring compression to regulate the opening pressure, have been found to require disassembly from the pipeline before pressure adjustment can be performed. Furthermore, pressure adjustment is not always successful on the first attempt, necessitating repeated testing to ensure accuracy. This repetitive disassembly and reassembly makes pressure adjustment time-consuming, labor-intensive, and inconvenient. Therefore, we propose a pressure-adjustable check valve to address these issues. Utility Model Content

[0005] The purpose of this invention is to provide a pressure-adjustable check valve to solve the problems currently existing in the market as described in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a pressure-adjustable check valve, comprising a valve body, wherein flanges are symmetrically fixedly connected to both ends of the valve body, and a fixing seat and a valve seat are respectively fixedly connected to the interior of both sides of the valve body, wherein... A rotating frame is rotatably connected to the middle of the fixed base. A sleeve is threadedly connected to the middle of the inner side of the rotating frame. An annular baffle is fixedly connected to one end of the sleeve near the valve seat. A valve stem passes through the sleeve and the annular baffle. A through-hole is passed through the middle of the valve seat. A valve plate is fixedly connected to one end of the valve stem corresponding to the through-hole. A spring is sleeved on the valve stem between the valve plate and the annular baffle. The fixed base has symmetrical through holes near its side. The valve body has a rotating shaft groove on the top of the side corresponding to the fixed base. A rotating shaft passes through the rotating shaft groove. A limit bracket is fixedly connected inside the rotating shaft of the valve body. The rotating shaft is rotatably connected to the limit bracket. A first reversing gear is fixedly connected to the bottom end of the rotating shaft. A second reversing gear is fixedly connected to the side of the rotating frame near the first reversing gear. A hexagonal head is fixedly connected to the top end of the rotating shaft.

[0007] Preferably, the inner diameter of the sleeve and the annular baffle matches the outer diameter of the valve stem.

[0008] Preferably, the fixed base has a guide groove extending through it on the side near the bottom of the rotating frame, and a guide rod is fixedly connected to one end of the annular baffle corresponding to the guide groove.

[0009] Preferably, the outer diameter of the valve plate is smaller than the inner diameter of the valve body, and the outer diameter of the valve plate is larger than the inner diameter of the inlet.

[0010] Preferably, dynamic sealing rings are symmetrically installed in the upper and lower parts of the shaft groove, and the inner wall of the shaft groove is sealed to the shaft through the dynamic sealing rings.

[0011] Preferably, the first reversing gear and the second reversing gear are perpendicular to each other, and the first reversing gear and the second reversing gear mesh with each other.

[0012] Preferably, the outer surface of the section of the rotating shaft located outside the valve body is fixedly connected with an external thread, and the rotating shaft is threadedly connected to a locking nut through the external thread. A disc spring is sleeved on the rotating shaft between the locking nut and the valve body.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: In this invention, the valve plate, in its initial state, is sealed to the valve seat by a spring. Upon reaching the set pressure, the fluid pressure exceeds the spring force, causing the fluid to push the valve plate away from the valve seat. This allows the fluid to flow through the port and through-hole into the valve body. When adjusting the check valve's opening pressure, a hexagonal head drives a rotating shaft. This shaft, via a first and second reversing gear, drives a rotating frame. The rotating frame, through a threaded connection, moves a sleeve, which in turn moves an annular baffle. By adjusting the initial distance between the annular baffle and the valve plate, the spring compression is adjusted. This allows for direct adjustment of the check valve's opening pressure without disassembling the check valve, effectively improving the adjustment efficiency of the pressure-adjustable check valve.

[0014] In this invention, when the rotating shaft needs to be rotated, the locking nut is first loosened, and then the rotating shaft is driven to rotate by the hexagonal head, thereby adjusting the opening pressure of the check valve. After adjustment, the locking nut is tightened, and the locking nut is pressed tightly against the top of the valve body by the disc spring, thereby locking the rotating shaft and preventing the first and second reversing gears from rotating automatically due to fluid vibration, thus locking the opening pressure of the check valve. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a three-dimensional structural diagram of the present invention; Figure 3 This is a cross-sectional three-dimensional structural diagram of the present invention; Figure 4 This utility model Figure 1 A magnified view of the structure at point A in the middle; Figure 5 This utility model Figure 3 A magnified schematic diagram of the structure at point B in the middle.

[0016] In the diagram: 1. Valve body; 2. Flange; 3. Fixed seat; 4. Valve seat; 5. Rotating bracket; 6. Sleeve; 7. Annular baffle; 8. Valve stem; 9. Through port; 10. Valve plate; 11. Spring; 12. Through hole; 13. Guide groove; 14. Guide rod; 15. Shaft groove; 16. Shaft; 17. Dynamic seal ring; 18. Limit bracket; 19. First reversing gear; 20. Second reversing gear; 21. Hexagonal head; 22. External thread; 23. Locking nut; 24. Disc spring. Detailed Implementation

[0017] 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.

[0018] Please see Figures 1 to 5 This utility model provides a technical solution: a pressure-adjustable check valve, including a valve body 1, flanges 2 symmetrically fixedly connected to both ends of the valve body 1, and a fixing seat 3 and a valve seat 4 respectively fixedly connected inside both sides of the valve body 1. A rotating frame 5 is rotatably connected to the middle of the fixed base 3. A sleeve 6 is threadedly connected to the middle of the inner side of the rotating frame 5. An annular baffle 7 is fixedly connected to one end of the sleeve 6 near the valve seat 4. A valve stem 8 passes through the sleeve 6 and the annular baffle 7. A through port 9 passes through the middle of the valve seat 4. A valve plate 10 is fixedly connected to one end of the valve stem 8 corresponding to the through port 9. A spring 11 is sleeved on the valve stem 8 between the valve plate 10 and the annular baffle 7. The fixed seat 3 has symmetrical through holes 12 near the side. The valve body 1 has a rotating shaft groove 15 through the top of the side corresponding to the fixed seat 3. The rotating shaft 16 passes through the rotating shaft groove 15. The valve body 1 is fixedly connected to the inside of the rotating shaft 16. The rotating shaft 16 is rotatably connected to the limiting bracket 18. The bottom end of the rotating shaft 16 is fixedly connected to the first reversing gear 19. The rotating frame 5 is fixedly connected to the side of the first reversing gear 19 to the second reversing gear 20. The top end of the rotating shaft 16 is fixedly connected to the hexagonal head 21. In its initial state, the valve plate 10 is pressed against the valve seat 4 by the spring 11, sealing the port 9. After reaching the set pressure, the fluid pressure is greater than the elastic force of the spring 11, and the fluid pushes the valve plate 10 away from the valve seat 4, allowing the fluid to flow through the port 9 and the through hole 12 into the interior of the valve body 1. When it is necessary to adjust the opening pressure of the check valve, the hexagonal head 21 drives the rotating shaft 16 to rotate, which in turn drives the rotating frame 5 to rotate through the first reversing gear 19 and the second reversing gear 20. The rotating frame 5 drives the sleeve 6 to move through the threaded connection, which in turn drives the annular baffle 7 to move. By adjusting the initial distance between the annular baffle 7 and the valve plate 10, the compression of the spring 11 is adjusted. Thus, the opening pressure of the check valve can be directly adjusted without disassembling the check valve, effectively improving the adjustment efficiency of the pressure adjustable check valve.

[0019] Please see Figures 1 to 5 The inner diameters of the sleeve 6 and the annular baffle 7 match the outer diameter of the valve stem 8. The fixed seat 3 has a guide groove 13 running through it on the side near the bottom of the rotating frame 5. The annular baffle 7 is fixedly connected to a guide rod 14 at one end corresponding to the guide groove 13. The outer diameter of the valve plate 10 is smaller than the inner diameter of the valve body 1, and the outer diameter of the valve plate 10 is larger than the inner diameter of the port 9. When the rotating frame 5 rotates, the guide rod 14 and the guide groove 13 prevent the sleeve 6 and the annular baffle 7 from being driven to rotate, so that the rotating frame 5 and the sleeve 6 can rotate relative to each other. Then, the sleeve 6 and the annular baffle 7 can be moved through the threaded connection. When the annular baffle 7 moves, it is guided by the guide rod 14 and the guide groove 13 to prevent the movement of the annular baffle 7 from being offset, so as to facilitate the adjustment of the compression of the spring 11. The valve plate 10 is covered with rubber material on the side facing the valve seat 4, so that the port 9 can be sealed when the valve plate 10 abuts against the valve seat 4.

[0020] Please see Figures 1 to 5The rotating shaft groove 15 is symmetrically installed with dynamic sealing rings 17 on the upper and lower sides. The inner wall of the rotating shaft groove 15 is sealed to the rotating shaft 16 through the dynamic sealing rings 17. The first reversing gear 19 and the second reversing gear 20 are perpendicular to each other and mesh with each other. The first reversing gear 19, the second reversing gear 20, the rotating frame 5, the sleeve 6, the annular baffle 7, the valve stem 8, the spring 11 and other components inside the valve body 1 are all made of stainless steel to avoid being viewed from above by the fluid, thereby improving the stability of the internal structure of the valve body 1.

[0021] Please see Figures 1 to 5 The rotating shaft 16 is fixedly connected to the outer surface of the outer section of the valve body 1 with an external thread 22. The rotating shaft 16 is threaded with a locking nut 23 through the external thread 22. A disc spring 24 is sleeved on the rotating shaft 16 between the locking nut 23 and the valve body 1. When it is necessary to rotate the rotating shaft 16, the locking nut 23 is loosened first, and then the rotating shaft 16 is rotated through the hexagonal head 21, thereby adjusting the opening pressure of the check valve. After the adjustment is completed, the locking nut 23 is tightened. The locking nut 23 is tightly pressed against the top of the valve body 1 through the disc spring 24, thereby locking the rotating shaft 16 and preventing the first reversing gear 19 and the second reversing gear 20 from rotating automatically due to the vibration of the fluid, thereby locking the opening pressure of the check valve.

[0022] Working principle: This pressure-adjustable check valve has a valve plate 10 initially sealed by a spring 11 against a valve seat 4. When the set pressure is reached, the fluid pressure is greater than the spring force of the spring 11, and the fluid pushes the valve plate 10 away from the valve seat 4, allowing the fluid to flow through the port 9 and through hole 12 into the valve body 1. When the opening pressure of the check valve needs to be adjusted, the hexagonal head 21 drives the rotating shaft 16 to rotate, which in turn drives the rotating frame 5 to rotate via the first reversing gear 19 and the second reversing gear 20. The rotating frame 5 drives the sleeve 6 to move via a threaded connection, which in turn drives the annular baffle 7 to move. By adjusting the initial distance between the annular baffle 7 and the valve plate 10, the compression of the spring 11 is adjusted. Thus, the opening pressure of the check valve can be directly adjusted without disassembling the check valve, effectively improving the adjustment efficiency of the pressure-adjustable check valve. When the rotating frame 5 rotates, the guide rod 14 and guide groove 13 prevent the sleeve 6 and annular baffle 7 from being driven to rotate, allowing the rotating frame 5 and sleeve 6 to rotate relative to each other. This enables the sleeve 6 and annular baffle 7 to move via a threaded connection. Furthermore, the annular baffle 7 is guided by the guide rod 14 and guide groove 13 during movement, preventing it from shifting. This facilitates adjustment of the compression of the spring 11. The valve plate 10 is covered with rubber material on the side facing the valve seat 4, allowing for easy adjustment of the valve plate 10. When the valve seat 4 is pressed against the valve, the port 9 is sealed. When the rotating shaft 16 needs to be rotated, the locking nut 23 is loosened first, and then the rotating shaft 16 is rotated by the hexagonal head 21, thereby adjusting the opening pressure of the check valve. After the adjustment is completed, the locking nut 23 is tightened. The locking nut 23 is pressed tightly against the top of the valve body 1 by the disc spring 24, thereby locking the rotating shaft 16 to prevent the first reversing gear 19 and the second reversing gear 20 from rotating automatically due to the vibration of the fluid, thereby locking the opening pressure of the check valve.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pressure-adjustable check valve, comprising a valve body (1), characterized in that: The valve body (1) is symmetrically fixedly connected to flanges (2) at both ends, and fixed seats (3) and valve seats (4) are fixedly connected to the inside of both sides of the valve body (1), respectively. A rotating frame (5) is rotatably connected to the middle of the fixed seat (3). A sleeve (6) is threadedly connected to the middle of the inner side of the rotating frame (5). An annular baffle (7) is fixedly connected to one end of the sleeve (6) near the valve seat (4). A valve stem (8) passes through the sleeve (6) and the annular baffle (7). A through-hole (9) passes through the middle of the valve seat (4). A valve plate (10) is fixedly connected to one end of the valve stem (8) corresponding to the through-hole (9). A spring (11) is sleeved on the valve stem (8) between the valve plate (10) and the annular baffle (7). The fixed seat (3) has symmetrical through holes (12) near the side. The valve body (1) has a rotating shaft groove (15) on the top side of the fixed seat (3). A rotating shaft (16) passes through the rotating shaft groove (15). A limit bracket (18) is fixedly connected inside the rotating shaft (16) of the valve body (1). The rotating shaft (16) is rotatably connected to the limit bracket (18). A first reversing gear (19) is fixedly connected to the bottom end of the rotating shaft (16). A second reversing gear (20) is fixedly connected to the side of the rotating frame (5) near the first reversing gear (19). A hexagonal head (21) is fixedly connected to the top end of the rotating shaft (16).

2. The pressure-adjustable check valve according to claim 1, characterized in that: The inner diameter of the sleeve (6) and the annular baffle (7) matches the outer diameter of the valve stem (8).

3. The pressure-adjustable check valve according to claim 1, characterized in that: The fixed seat (3) has a guide groove (13) running through it on the side below the rotating frame (5), and the annular baffle (7) is fixedly connected to a guide rod (14) at one end of the guide groove (13).

4. The pressure-adjustable check valve according to claim 1, characterized in that: The outer diameter of the valve plate (10) is smaller than the inner diameter of the valve body (1), and the outer diameter of the valve plate (10) is larger than the inner diameter of the port (9).

5. A pressure-adjustable check valve according to claim 1, characterized in that: The rotating shaft groove (15) is symmetrically installed with dynamic sealing rings (17) on the upper and lower sides. The inner wall of the rotating shaft groove (15) is sealed to the rotating shaft (16) through the dynamic sealing rings (17).

6. The pressure-adjustable check valve according to claim 1, characterized in that: The first reversing gear (19) and the second reversing gear (20) are perpendicular to each other, and the first reversing gear (19) and the second reversing gear (20) mesh with each other.

7. The pressure-adjustable check valve according to claim 1, characterized in that: The rotating shaft (16) is fixedly connected to the outer surface of the section outside the valve body (1) with an external thread (22). The rotating shaft (16) is threaded with a locking nut (23) through the external thread (22). A disc spring (24) is sleeved on the rotating shaft (16) between the locking nut (23) and the valve body (1).

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