Sanitary check valve

Abstract

The sanitary check valve particularly relates to the technical field of valves and comprises a valve body, a valve cavity is formed in the valve body, a medium inlet and a medium outlet which are communicated with the valve cavity are formed in the two ends of the valve body respectively, a valve seat is fixedly arranged at the medium inlet in the valve cavity, and a valve element and a valve rod are arranged in the valve cavity. Through the arrangement of the resistance adjusting mechanism, in the closing process of the valve, axial movement of the valve rod is utilized to drive the telescopic rod to slide along the spiral second guide groove, the valve rod is forced to rotate and drive the plugging disc to switch the position, in the early stage, the communicating part is aligned with the circulating groove to achieve pressure relief, and the reset resistance of the valve element is reduced to accelerate closing; in the later period, the blocking part covers the circulating groove to gradually increase resistance, damping buffering is formed when the valve element is about to make contact with the valve seat, water hammer impact at the closing tail section is effectively prevented, the sealing face is protected, and tight closing is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and more specifically, to a sanitary check valve. Background Technology

[0002] Sanitary check valves are special valves used in clean industries such as food and beverage and biopharmaceutical. They automatically open and close by the flow of the medium itself, ensuring unidirectional fluid flow.

[0003] Chinese Patent Application No. 202210912224.4 discloses a sanitary check valve, including a valve body with an outlet and an inlet that are interconnected. A valve seat is provided inside the inlet, and a valve disc is provided on the valve seat. A valve stem is fixedly connected to the valve disc. A support ring is mounted inside the outlet, and the inner hole of the support ring is slidably connected to the valve stem. A return spring is provided between the support ring and the valve disc. A damping cylinder is fixedly mounted on the support ring. Damping holes are evenly distributed on the side wall of the damping cylinder. A liquid inlet hole is provided at the bottom of the damping cylinder, and a one-way liquid inlet valve is provided on the liquid inlet hole. A piston disc is provided at the upper end of the valve stem, and the piston disc is slidably connected to the inner hole of the damping cylinder. When the valve disc closes, the piston disc on the valve stem moves into the damping cylinder. The medium inside the damping cylinder is forced out through the damping holes on the side wall, which dampens the piston disc, thereby achieving a slow closing effect on the valve disc, reducing the impact force between the valve disc sealing surface and the valve seat sealing surface, and reducing the occurrence of water hammer.

[0004] While the aforementioned inventions can reduce water hammer, in high-speed beverage bottling lines, when the bottling machine suddenly stops, the flowing juice in the pipes cannot stop immediately due to inertia. Traditional check valves, due to structural design limitations, exhibit a significant delay in closing. This brief lag causes a small amount of juice that has already flowed downstream to flow back upstream, contaminating the cleaned and filtered fresh juice. This backflow can not only clog the upstream filtration system and increase maintenance costs, but more seriously, it exposes the filled product to the risk of microbial contamination.

[0005] This invention provides a sanitary check valve, which aims to solve the above-mentioned problems. Summary of the Invention

[0006] The purpose of this invention is to provide a sanitary check valve to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a sanitary check valve, comprising a valve body having a valve cavity inside, a medium inlet and a medium outlet communicating with the valve cavity at both ends of the valve body, a valve seat being provided at the medium inlet within the valve cavity, a valve core cooperating with the valve seat and a valve stem connected to the valve core being provided within the valve cavity, a support frame being provided within the valve cavity, and a first elastic element being provided between the valve core and the support frame, further comprising: A resistance adjustment mechanism is connected to the valve core and the valve stem, and is used to adjust the reset resistance of the valve core during the closing process. An energy storage mechanism is disposed on the travel path of the valve stem to store energy when the valve is fully open and automatically release it at a specific position before the valve core closes to contact the valve seat, providing the valve core with an instantaneous additional sealing impact force.

[0008] Preferably, the resistance adjustment mechanism includes a flow groove formed on the valve core, a sealing disc rotatably disposed inside the valve core, and a guide cylinder disposed on the support frame; One end of the valve stem is fixedly connected to the sealing disc, and the other end is movably inserted into the guide cylinder; The sealing plate is provided with a sealing part for sealing the flow channel and a connecting part for connecting the flow channel; When the valve stem moves axially relative to the guide cylinder, the valve stem is driven to rotate, thereby causing the sealing disc to switch the position of the sealing part and the communicating part relative to the flow groove.

[0009] Preferably, the inner sidewall of the upper part of the guide cylinder is symmetrically provided with two axially extending first guide grooves and two spirally extending second guide grooves, and the two ends of the two second guide grooves are respectively connected to the two ends of the two first guide grooves.

[0010] Preferably, a limiting groove is formed on the side wall of the valve stem, a telescopic rod is slidably connected in the limiting groove, and a second elastic element is connected between the telescopic rod and the bottom wall of the limiting groove; The end of the telescopic rod is adapted to slide within the first guide groove or the second guide groove.

[0011] Preferably, the spiral-shaped second guide groove has a depth less than that of the first guide groove communicating with it at the end near the medium inlet, and a depth greater than that of the first guide groove communicating with it at the end near the medium outlet.

[0012] Preferably, the energy storage mechanism includes an energy storage ring slidably disposed within the guide cylinder, a third elastic element acting on the energy storage ring, a locking component for locking the energy storage ring in a compressed state, and a trigger rod disposed on the valve stem for triggering the locking component.

[0013] Preferably, the locking assembly includes a first telescopic groove formed on the energy storage ring, a first limiting rod slidably disposed in the first telescopic groove, a second telescopic groove formed in the first limiting rod, a second limiting rod slidably disposed in the second telescopic groove, and a limiting hole formed on the inner wall of the guide cylinder. A fourth elastic element is provided between the first limiting rod and the bottom wall of the first telescopic groove; A fifth elastic element is provided between the second limiting rod and the bottom wall of the second telescopic groove; When the valve is fully open, the first telescopic groove 33 is aligned with the limiting hole 311, and the second limiting rod is adapted to extend and insert into the limiting hole under the action of the fifth elastic element.

[0014] Preferably, the trigger rod is fixedly connected to the end of the valve stem, and the trigger rod has a tapered pressing part and a releasing part with a diameter smaller than the pressing part.

[0015] Preferably, a guide rod is fixedly connected to the side of the valve core facing the support frame, and a guide hole is provided on the support frame to slide with the guide rod.

[0016] Preferably, the number of the flow channel, the blocking part, and the connecting part are all two, and they are arranged symmetrically.

[0017] The technical effects and advantages of this invention are as follows: 1. This invention, through the setting of a resistance adjustment mechanism, utilizes the axial movement of the valve stem to drive the telescopic rod to slide along the spiral second guide groove during the valve closing process. This forces the valve stem to rotate and drives the sealing disc to switch positions. Initially, pressure is released by aligning the connecting part with the flow groove, reducing the valve core reset resistance to accelerate closing. Later, the resistance is gradually increased by covering the flow groove with the sealing part, forming a damping buffer when the valve core is about to contact the valve seat. This effectively prevents water hammer impact at the end of the closing process, protects the sealing surface, and ensures tight closure.

[0018] 2. The present invention, through the setting of the energy storage mechanism, compresses the third elastic element when the valve is fully open and locks the energy storage by inserting the second limiting rod into the limiting hole. Just before the valve core is about to contact the valve seat at the end of the closing, the release part of the trigger rod allows the first limiting rod to retract and release the second limiting rod. After the lock is released, the third elastic element releases its elastic potential energy instantly, pushing the energy storage ring to impact the valve stem, providing additional instantaneous power to the valve core, ensuring that the final seal can be completed quickly and tightly even under pressure fluctuations or impurity interference, and preventing the risk of micro-leakage. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 This is a cross-sectional view of the overall internal structure of the present invention.

[0021] Figure 3 For the present invention Figure 2 Enlarged view of the structure of part A.

[0022] Figure 4 For the present invention Figure 2 Enlarged view of the structure of part B.

[0023] Figure 5 This is a schematic diagram of the valve core structure of the present invention.

[0024] Figure 6 This is a cross-sectional view of the internal structure of the rotating groove of the present invention.

[0025] Figure 7 This is a schematic diagram of the valve stem and sealing disc structure of the present invention.

[0026] Figure 8 This is a schematic diagram of the support frame and guide cylinder structure of the present invention.

[0027] Figure 9 This is a cross-sectional view of the guide cylinder structure of the present invention.

[0028] Figure 10 This is a perspective view of the valve stem and guide cylinder in the engagement state of the present invention.

[0029] Figure 11 This is an exploded view of the first and second limiting rods of the present invention.

[0030] Figure 12 This is a schematic diagram showing the state of the valve stem and energy storage ring when the valve of the present invention is fully open.

[0031] Figure 13 This is a schematic diagram showing the state of the valve stem and energy storage ring during the valve closing process of the present invention.

[0032] The reference numerals in the attached drawings are as follows: 1. Valve body; 11. Valve cavity; 12. Medium inlet; 13. Medium outlet; 14. Valve seat; 15. Valve core; 16. Valve stem; 17. Support frame; 18. Guide cylinder; 19. First elastic element; 110. Guide rod; 111. Guide hole; 2. Resistance adjustment mechanism; 21. Flow groove; 22. Rotary groove; 23. Sealing disc; 24. Sealing part; 25. Connecting part; 26. First guide groove; 27. Second guide groove; 28. Limiting groove; 29. ​​Telescopic rod; 210. Second elastic element; 3. Energy storage mechanism; 31. Energy storage ring; 32. Third elastic element; 33. First telescopic groove; 34. First limiting plate; 35. First limiting rod; 36. Fourth elastic element; 37. Second telescopic groove; 38. Second limiting plate; 39. Second limiting rod; 310. Fifth elastic element; 311. Limiting hole; 312. Trigger rod; 313. Pressing part; 314. Release part. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Example 1 refer to Figures 1 to 13 An embodiment of the present invention provides a sanitary check valve, comprising a valve body 1, which has a valve cavity 11 inside. The valve body 1 has a medium inlet 12 and a medium outlet 13 communicating with the valve cavity 11 at both ends. A valve seat 14 is fixedly provided at the medium inlet 12 inside the valve cavity 11. A valve core 15 and a valve stem 16 are provided inside the valve cavity 11. A guide cylinder 18 is fixedly connected to the valve cavity 11 through a support frame 17. A first elastic element 19 is connected between the valve core 15 and the support frame 17 and sleeved on the valve stem 16 to provide elastic force for the valve core 15 to return to the valve seat 14.

[0035] refer to Figure 5 and Figure 8 A plurality of guide rods 110 are fixedly connected to the side of the valve core 15 facing the support frame 17. The support frame 17 has guide holes 111 that correspond one-to-one with the guide rods 110 and are slidably engaged, which are used to limit the valve core 15 to move only along the axial direction and prevent it from deflecting or rotating.

[0036] refer to Figures 2 to 10It also includes a resistance adjustment mechanism 2, which includes two through-flow grooves 21 symmetrically opened on one side of the valve core 15, and a rotating groove 22 opened inside the valve core 15 and communicating with the two flow grooves 21. The rotating groove 22 is coaxially arranged with the valve core 15, and a sealing disc 23 is rotatably connected inside it. The sealing disc 23 is symmetrically provided with two sealing parts 24 and two connecting parts 25. The sealing parts 24 are used to seal the corresponding flow grooves 21, and the connecting parts 25 are used to open the corresponding flow grooves 21. One end of the valve stem 16 is fixedly connected to the side of the sealing disc 23 facing away from the medium inlet 12, and the other end is movably inserted into the guide cylinder 18, which can slide axially and rotate in a restricted manner.

[0037] refer to Figure 9 and Figure 10 The inner wall of the guide cylinder 18 is symmetrically provided with two first guide grooves 26 extending along the axis and two second guide grooves 27 surrounding the cylinder wall. Both second guide grooves 27 are spiral in shape. One end of each second guide groove 27 is connected to the end of a first guide groove 26 near the medium inlet 12, and the other end is connected to the end of a first guide groove 26 near the medium outlet 13. The depth of the second guide groove 27 at the end near the medium inlet 12 is less than that of the connected first guide groove 26, and the depth at the end near the medium outlet 13 is greater than that of the connected first guide groove 26.

[0038] refer to Figure 3 and Figure 7 Two limiting grooves 28 are symmetrically opened on the outer circumference of the valve stem 16. A telescopic rod 29 is slidably connected in each limiting groove 28. A second elastic element 210 is connected between the telescopic rod 29 and the bottom wall of the limiting groove 28. The ends of the two telescopic rods 29 are slidably fitted in the two first guide grooves 26 and the two second guide grooves 27, respectively, to guide the axial movement and rotation of the valve stem 16. The ends of the telescopic rods 29 can be hinged with balls or installed with rollers to reduce friction.

[0039] In actual operation, when the medium flows in at high speed from the medium inlet 12, the pressure will push the valve core 15 to overcome the elastic force of the first elastic element 19 and move away from the valve seat 14, so that the valve opens and the medium can flow out from the medium outlet 13 through the valve cavity 11.

[0040] When the valve core 15 moves, it will drive the valve stem 16 and the two telescopic rods 29 to slide along the corresponding first guide groove 26. When the valve is fully open and the first elastic element 19 is fully compressed, the two telescopic rods 29 reach the end of the corresponding first guide groove 26 near the medium outlet 13, and slide into the end of the deeper second guide groove 27 under the thrust of the corresponding second elastic element 210.

[0041] When the pressure at the medium inlet 12 decreases, the first elastic element 19 pushes the valve core 15 back to reset and closes the medium inlet 12. At this time, since the two telescopic rods 29 are located in the two spiral second guide grooves 27, during the reset movement of the valve stem 16, the telescopic rods 29 slide along the spiral second guide grooves 27, forcing the valve stem 16 to drive the sealing disc 23 to rotate in the rotating groove 22, ultimately causing the positions of the two sealing parts 24 and the two connecting parts 25 on the sealing disc 23 to be swapped.

[0042] As the sealing disc 23 rotates, the positions of the two sealing parts 24 and the two connecting parts 25 are swapped. This causes the sealing part 24, which originally blocked the flow channel 21, to gradually move away, and the connecting part 25 to align with the flow channel 21. This allows the medium on the back of the valve core 15 to be depressurized through the flow channel 21, reducing the resistance to the reset movement of the valve core 15 and accelerating its initial closing speed.

[0043] As the valve stem 16 continues to move back to its original position and the sealing disc 23 rotates, the sealing part 24 gradually covers the flow groove 21, causing the flow resistance to gradually increase. When the valve core 15 is about to contact the valve seat 14, it forms damping, effectively buffering the impact at the end of the closing stage, preventing the valve core 15 from hitting the valve seat 14 and generating water hammer, protecting the sealing surface, and ensuring a tight closure.

[0044] When the valve core 15 is fully closed, the telescopic rod 29 moves to the end of the second guide groove 27 near the medium inlet 12. Under the thrust of the corresponding second elastic element 210, the telescopic rod 29 will re-extend into the corresponding first guide groove 26 to prepare for the next valve opening.

[0045] In summary, by setting up the resistance adjustment mechanism 2, during the valve closing process, the axial movement of the valve stem 16 drives the telescopic rod 29 to slide along the spiral second guide groove 27, forcing the valve stem 16 to rotate and drive the sealing disc 23 to switch positions. Initially, the pressure is relieved by aligning the connecting part 25 with the flow groove 21, reducing the reset resistance of the valve core 15 to accelerate closing. Later, the resistance is gradually increased by covering the flow groove 21 with the sealing part 24, forming a damping buffer when the valve core 15 is about to contact the valve seat 14, effectively preventing water hammer impact at the end of the closing process, protecting the sealing surface and ensuring tight closure.

[0046] Example 2 In actual use, at the end of valve closure, at the moment when the valve core 15 is about to contact the valve seat 14 to complete the seal, since the valve core 15 reset power only relies on the conventional elastic force of the first elastic element 19, the closing kinetic energy may be insufficient, the sealing action may be slow, or the seal may not be tight due to pressure fluctuations or residual pressure interference in the pipeline. Therefore, this embodiment improves the device described in the above embodiment.

[0047] refer to Figures 2 to 13It also includes an energy storage mechanism 3, which includes an energy storage ring 31 that is slidably connected inside the guide cylinder 18. The energy storage ring 31 is located at the end of the valve stem 16 away from the valve core 15. A third elastic element 32 is sleeved inside the guide cylinder 18. One end of the third elastic element 32 is connected to the end of the energy storage ring 31 away from the valve stem 16, and the other end is connected to the end of the guide cylinder 18 near the medium outlet 13.

[0048] refer to Figure 4 The energy storage ring 31 has two symmetrically arranged first expansion grooves 33 inside. One end of each first expansion groove 33 is connected to the inner side of the energy storage ring 31, and the other end of each first expansion groove 33 is connected to the outer side of the energy storage ring 31. The interior of each first expansion groove 33 is slidably connected to a first limiting rod 35 facing the inner side of the energy storage ring 31 through a first limiting plate 34. A fourth elastic element 36 is connected between the end of each first limiting plate 34 away from the inner side of the energy storage ring 31 and the corresponding first expansion groove 33.

[0049] refer to Figure 4 and Figure 11 Each of the two first limiting rods 35 has a second telescopic groove 37 at one end that is far apart from each other. The interior of each of the two second telescopic grooves 37 is slidably connected to a second limiting rod 39 facing the outside of the energy storage ring 31 via a second limiting plate 38. A fifth elastic element 310 is connected between the end of each of the two second limiting plates 38 that is far away from the outside of the energy storage ring 31 and the corresponding second telescopic groove 37.

[0050] refer to Figure 9 and Figure 13 Two limiting holes 311 are symmetrically opened on the lower inner side of the guide cylinder 18. The two limiting holes 311 correspond to the positions of the two first telescopic grooves 33. When the valve stem 16 pushes the energy storage ring 31 to compress the fourth elastic element 36 to move to the limit position, the two limiting holes 311 correspond to the positions of the two first telescopic grooves 33, and the two second limiting rods 39 can be inserted into the limiting holes 311. Through the cooperation with the inner wall of the guide cylinder 18, the energy storage ring 31 is prevented from axially resetting under the action of the third elastic element 32, thereby achieving locking.

[0051] refer to Figure 2 , Figure 12 and Figure 13 A trigger rod 312 is fixedly connected to the end of the valve stem 16 away from the valve core 15. The trigger rod 312 is coaxially arranged with the valve stem 16. The trigger rod 312 is provided with a pressing part 313 and a releasing part 314. The pressing part 313 is tapered and is used to press the first limiting rod 35 into the first telescopic groove 33. The diameter of the releasing part 314 is smaller than the minimum diameter of the pressing part 313 and is used to provide radial space to allow the second limiting rod 39 to extend out of the second telescopic groove 37 when the valve is closed to a specific position.

[0052] In actual operation, when the valve is closed, the first limiting rod 35 and the second limiting rod 39 will be located in the first telescopic groove 33 under the squeezing action of the guide cylinder 18 wall and the trigger rod 312.

[0053] During valve opening, valve core 15 pushes energy storage ring 31 to move in the guide cylinder 18 toward medium outlet 13 via valve stem 16, and compresses third elastic element 32.

[0054] When the valve is fully open, the first telescopic groove 33 corresponds to the position of the limiting hole 311. At this time, the second limiting rod 39 will extend under the thrust of the fifth elastic element 310 and insert into the limiting hole 311, so that the energy storage ring 31 cannot move, thus completing the storage of elastic potential energy of the third elastic element 32.

[0055] During the valve closing process, the valve core 15 drives the valve stem 16 and the trigger rod 312 to move towards the medium inlet 12. In the initial stage, the valve stem 16 drives the trigger rod 312 to move towards the medium inlet 12 together, but the release part 314 of the trigger rod 312 has not yet acted on the first limit rod 35. Therefore, the energy storage mechanism 3 is still in the locked state, and the stored energy is maintained, which does not affect the low resistance rapid closing achieved by the resistance regulating mechanism 2 through pressure relief in the initial stage of valve core 15 reset.

[0056] As the valve core 15 enters the final stage of its closing stroke and is about to contact the valve seat 14, the trigger rod 312 on the valve stem 16 moves to a specific position, and its release part 314 corresponds to the position of the first limiting rod 35. Under the thrust of the fourth elastic element 36, the first limiting rod 35 retracts inward and drives the second limiting rod 39, which has moved to the limit position of the second telescopic groove 37, to be pulled out from the limiting hole 311, releasing the lock on the energy storage ring 31. The compressed third elastic element 32 instantly releases its stored elastic potential energy, pushing the energy storage ring 31 to rush at high speed toward the end of the valve stem 16, providing an additional, instantaneous impact force for the final closing action of the valve core 15 and the valve stem 16. This ensures that even in the case of slight pressure fluctuations or impurities, the valve core 15 can decisively and quickly complete the final seal with the valve seat 14, eliminating micro-leakage caused by incomplete closure.

[0057] During the process of the third elastic element 32 pushing the energy storage ring 31 back into contact with the valve stem 16, the first limiting rod 35 and the second limiting rod 39 will return to the first telescopic groove 33 under the squeezing action of the guide cylinder 18 wall and the squeezing part 313 of the trigger rod 312 to prepare for the next energy storage.

[0058] In summary, through the setting of the energy storage mechanism 3, when the valve is fully open, the energy storage ring 31 compresses the third elastic element 32 and locks the energy storage by inserting the second limiting rod 39 into the limiting hole 311. Before the valve core 15 of the closed section is about to contact the valve seat 14, the release part 314 of the trigger rod 312 allows the first limiting rod 35 to retract and release the second limiting rod 39. After the lock is released, the third elastic element 32 releases its elastic potential energy instantly, pushing the energy storage ring 31 to impact the valve stem 16, providing additional instantaneous power to the valve core 15, ensuring that the final seal can be completed quickly and tightly even under pressure fluctuations or impurity interference, and preventing the risk of micro-leakage.

[0059] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sanitary check valve, comprising a valve body (1) with a valve cavity (11) inside, a medium inlet (12) and a medium outlet (13) at both ends of the valve body (1) respectively, a valve seat (14) in the valve cavity (11) at the medium inlet (12), a valve core (15) cooperating with the valve seat (14) and a valve rod (16) connected with the valve core (15) in the valve cavity (11), a support frame (17) in the valve cavity (11), and a first elastic member (19) between the valve core (15) and the support frame (17), characterized in that, Also includes: A resistance adjustment mechanism (2) is connected to the valve core (15) and the valve stem (16) and is used to adjust the reset resistance of the valve core (15) during the closing process. Energy storage mechanism (3) is located on the travel path of the valve stem (16) and is used to store energy when the valve is fully open and automatically release it at a specific position before the valve core (15) closes to the valve seat (14), providing the valve core (15) with an instantaneous additional sealing impact force.

2. The sanitary check valve according to claim 1, characterized in that, The resistance adjustment mechanism (2) includes a flow groove (21) opened on the valve core (15), a sealing disc (23) rotatably disposed inside the valve core (15), and a guide cylinder (18) disposed on the support frame (17). One end of the valve stem (16) is fixedly connected to the sealing disc (23), and the other end is movably inserted into the guide cylinder (18); The sealing plate (23) is provided with a sealing part (24) for sealing the flow channel (21) and a connecting part (25) for connecting the flow channel (21). When the valve stem (16) moves axially relative to the guide cylinder (18), the valve stem (16) is driven to rotate, thereby causing the sealing disc (23) to switch the positions of the sealing part (24) and the connecting part (25) relative to the flow groove (21).

3. The sanitary check valve according to claim 2, characterized in that, The upper inner wall of the guide cylinder (18) is symmetrically provided with two axially extending first guide grooves (26) and two spirally extending second guide grooves (27), and the two ends of the two second guide grooves (27) are respectively connected to the two ends of the two first guide grooves (26).

4. The sanitary check valve according to claim 3, characterized in that, The valve stem (16) has a limiting groove (28) on its side wall. A telescopic rod (29) is slidably connected in the limiting groove (28). A second elastic element (210) is connected between the telescopic rod (29) and the bottom wall of the limiting groove (28). The end of the telescopic rod (29) is adapted to slide within the first guide groove (26) or the second guide groove (27).

5. The sanitary check valve according to claim 4, characterized in that, The spiral-shaped second guide groove (27) has a depth less than that of the first guide groove (26) connected to it at one end near the medium inlet (12), and a depth greater than that of the first guide groove (26) connected to it at one end near the medium outlet (13).

6. The sanitary check valve according to claim 2, characterized in that, The energy storage mechanism (3) includes an energy storage ring (31) slidably disposed in the guide cylinder (18), a third elastic element (32) acting on the energy storage ring (31), a locking component for locking the energy storage ring (31) in a compressed state, and a trigger rod (312) disposed on the valve stem (16) for triggering the locking component.

7. The sanitary check valve according to claim 6, characterized in that, The locking assembly includes a first telescopic groove (33) opened on the energy storage ring (31), a first limiting rod (35) slidably disposed in the first telescopic groove (33), a second telescopic groove (37) opened in the first limiting rod (35), a second limiting rod (39) slidably disposed in the second telescopic groove (37), and a limiting hole (311) opened on the inner wall of the guide cylinder (18). A fourth elastic element (36) is provided between the first limiting rod (35) and the bottom wall of the first telescopic groove (33). A fifth elastic element (310) is provided between the second limiting rod (39) and the bottom wall of the second telescopic groove (37). When the valve is fully open, the first telescopic groove (33) is aligned with the limiting hole (311), and the second limiting rod (39) is adapted to extend and insert into the limiting hole (311) under the action of the fifth elastic element (310).

8. The sanitary check valve according to claim 7, characterized in that, The trigger rod (312) is fixedly connected to the end of the valve stem (16). The trigger rod (312) has a tapered pressing part (313) and a releasing part (314) with a diameter smaller than the pressing part (313).

9. The sanitary check valve according to claim 2, characterized in that, The valve core (15) is fixedly connected to a guide rod (110) on the side facing the support frame (17), and the support frame (17) is provided with a guide hole (111) that slides with the guide rod (110).

10. The sanitary check valve according to claim 2, characterized in that, The number of the flow channel (21), the blocking part (24) and the connecting part (25) are all two, and they are arranged symmetrically.

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