A water conveyance valve capable of weakening water hammer pressure

Abstract

The present invention belongs to the field of valves, and particularly relates to a water conveyance valve capable of weakening water hammer pressure, which comprises a first connection shell. One end of the first connection shell is fixedly connected with a valve body. A second sleeve is slidably connected to one end of the valve body close to the first connection shell. The second sleeve is fixedly connected with the first connection shell. A water inlet is formed in the second sleeve. An air guide pipe is fixedly connected in the water inlet. One end of the air guide pipe away from the first connection shell is connected with a valve plug. A first sleeve is slidably connected to the water inlet. A first spring is fixedly connected between the second sleeve and the first sleeve. The first sleeve is fixedly connected with a valve plate. The first sleeve and the valve plate are fixedly connected by a plurality of first screws evenly distributed in the circumferential direction. A liquid discharge port tightly fitted with the valve plug is formed at the center of the valve plate. The present invention can eliminate the water hammer effect generated after the valve plate is closed, distribute the pressure, avoid the valve plate and the valve plug from being damaged due to impact, and utilize the water hammer effect to seal the valve plate and the valve plug to avoid failure.

Description

Technical Field

[0001] The invention belongs to the field of valves, and in particular relates to a water delivery valve capable of reducing water hammer pressure. Background Art

[0002] During the municipal pipeline water supply process, the pressure in the pipeline will fluctuate due to the influence of the water supply network layout, fluid characteristics, and water supply volume. Due to the instability of this pressure, it may affect the corresponding secondary water supply equipment in some cases. Now, some valves are often installed at the connection between the municipal pipeline and the secondary water supply equipment to reduce this impact. However, under the influence of pressure fluctuations, common pressure valves and check valves will also be more easily damaged.

[0003] The Chinese patent with the authorization announcement number CN112161090B discloses an axial flow check valve, comprising a valve body, a valve cavity is arranged in the valve body, a valve cover is fixedly mounted at the right end opening of the valve cavity, an outlet pipe communicating with the valve cavity is arranged on the left side of the valve body, and an inlet pipe communicating with the valve cavity is arranged in the valve cover; a valve core barrel with a right end opening is arranged on the inner side wall of the valve cavity, a mounting block is arranged on the inner side wall of the valve core barrel, a valve stem is slidably connected in the mounting block, a valve core block for controlling the on-off of the inlet pipe is arranged at the right end of the valve stem, a convex block is arranged at the left end of the valve stem, and a rotation-stopping rod extending into the convex block is arranged on the left side of the mounting block; a first spring is sleeved between the mounting block and the valve core block of the valve stem, and the first spring is used to force the valve core block to press against the inlet pipe; a buffer assembly is arranged at the left end of the valve core barrel, and a locking assembly is arranged on the convex block, so as to achieve a slow closing effect and reduce the impact of water hammer on the valve plate.

[0004] However, the above-mentioned disclosed scheme has the following shortcomings: it cannot play a buffering role for the backflowing medium, and thus cannot weaken or eliminate the water hammer effect. When the water hammer effect occurs, the water pressure is too high after the valve plate and the valve seat are combined, and the static pressure on the sealing surface between the valve plate and the valve seat is too high, which can easily cause damage to the sealing surface, thereby causing damage to the sealing surface. When encountering the water hammer effect, the valve plate is deformed due to the excessive water flow pressure, making the check valve seal ineffective. Summary of the invention

[0005] The object of the present invention is to address the above problems in the existing technology and propose a water conveyance valve capable of weakening water hammer pressure. When water flows into the present invention from the inlet side, the water flow impacts the liquid discharge port, causing the valve plate to disengage from the valve plug. Under the action of the water flow, the valve plate is closely attached to the first sealing ring for sealing. The water flow flows from the liquid discharge port to the outlet. When liquid is no longer injected into the inlet, the valve plate is combined with the valve plug again under the action of the first spring to prevent liquid backflow. During the reset process of the valve plate, the water in the liquid cavity is discharged from the liquid guiding channel to form damping, reducing the downward movement speed of the valve plate to avoid impact and damage between the valve plate and the valve plug. At the same time, the damping is used to buffer the water hammer effect, preventing the water hammer from generating excessive pressure and causing the valve body to rupture. The liquid flowing backward at the outlet impacts on the conical surface of the valve plate, thereby dispersing the water hammer effect acting on the valve plate and avoiding seal failure. At the same time, the backward flowing water enters the drawing liquid cavity, and the sliding piston ring is used to eliminate the water hammer effect. The water hammer compresses the gas in the air cavity, thereby forming air pressure in the air film cavity and pushing into the sealing groove of the rubber film ring to further seal the valve plate and the valve plug, ensuring the sealing effect and preventing seal failure.

[0006] The object of the present invention can be achieved by the following technical solutions: A water conveyance valve capable of weakening water hammer pressure, including a first connection shell, one end of the first connection shell is fixedly connected with a valve body, the first connection shell and the valve body are fixedly connected by a plurality of second bolts evenly distributed in the circumferential direction. A second sleeve is slidably connected to one end of the valve body close to the first connection shell. The end of the second sleeve extending out of the valve body extends into the first connection shell and is fixedly connected with the first connection shell. A through inlet is opened in the second sleeve, and an air guide pipe is fixedly connected in the inlet. The end of the air guide pipe away from the first connection shell is connected with a valve plug, and the valve plug and the air guide pipe are fixedly connected by a plurality of second screws evenly distributed in the circumferential direction. A valve plate component is slidably arranged in the second sleeve, and a piston component is arranged between the outer wall of the second sleeve and the inner wall of the valve body.

[0007] Preferably, the valve plate component includes a first sleeve, the first sleeve is slidably connected in the second sleeve, one end of the disc of the first sleeve is closely attached to and relatively slides with the inner wall of the valve body. A first spring surrounding the outside of the first sleeve is fixedly connected between the second sleeve and the first sleeve. The side of the first sleeve away from the second sleeve is fixedly connected with a valve plate, and the first sleeve and the valve plate are fixedly connected by a plurality of first screws evenly distributed in the circumferential direction. A liquid discharge port closely attached to the valve plug is opened at the center of the valve plate.

[0008] Preferably, a first sealing ring made of rubber is fixedly connected to one end of the valve body away from the first connection shell. One end of the first sealing ring extends into the valve body and is in close fit with the inner wall of the valve body. The taper of the conical surface of the first sealing ring is the same as that of the conical surface of the liquid guide channel. A second connection shell is fixedly connected to the side of the first sealing ring away from the valve body. The second connection shell, the first sealing ring and the valve body are fixedly and tightly connected by a plurality of first bolts evenly distributed in the circumferential direction. An outlet is formed at the center of the second connection shell, which penetrates through the second connection shell and the first sealing ring.

[0009] Preferably, the piston component includes a piston ring. A piston ring that is in close fit and sliding connection with the inner wall of the valve body is slidably connected to the outer wall of the second sleeve located inside the valve body. Second sealing rings that are in close fit and relative sliding connection with the inner wall of the valve body and the outer wall of the second sleeve are fixedly connected to the inner ring and the outer ring of the piston ring respectively. A second spring that surrounds the outside of the second sleeve is fixedly connected between the piston ring and one end of the valve body close to the first connection shell. An annular liquid cavity is formed between the sides of the piston ring away from the first connection shell, and an annular air cavity is formed on the side of the piston ring close to the first connection shell. By using the floating piston ring and the elastic action of the second spring, the water hammer effect is weakened to avoid damage to the equipment caused by the cracking of the pump body due to the water hammer effect.

[0010] Preferably, a first air guide channel is formed through the air guide pipe. A plurality of connecting pipes are fixedly connected to the position of the valve body close to the first connection shell corresponding to the air cavity in the circumferential direction. One end of each connecting pipe away from the valve body bends towards the axis direction of the second sleeve, passes through the second sleeve and is fixedly connected to the air guide pipe. The connecting pipes communicate the air cavity with the first air guide channel.

[0011] Preferably, a gas distribution groove communicating with the first air guide channel is formed inside the valve plug on the side close to the first air guide channel. An annular air film cavity is formed on the outer conical surface of the valve plug. A plurality of second air guide channels communicating the air film cavity and the gas distribution groove are formed in the valve plug at the positions between the air film cavity and the gas distribution groove in the circumferential direction. An annular sealing groove is formed on the conical surface of the valve plate in contact with the valve plug at the position corresponding to the air film cavity. A rubber film ring is fixedly connected to the air film cavity. By using the water hammer effect to compress the air in the air cavity on the piston ring, the rubber film ring is expanded to further seal and lock the valve plate and the valve plug, thereby avoiding the sealing failure caused by the impact of the water hammer effect on the valve plate and the valve plug. At the same time, when injecting liquid into the water inlet while generating the water hammer effect, the valve plate will not open, avoiding the mutual impact of the flowing water and damaging the equipment.

[0012] Preferably, a plurality of liquid guide channels that penetrate through the first sleeve and communicate with the liquid cavity are formed in the valve plate at the positions corresponding to the first sealing ring in the circumferential direction. A conical surface is provided on the side of the valve plate close to the second sleeve and close to the valve plug.

[0013] Preferably, a first flange is fixedly arranged at one end of the first connecting shell away from the valve body, a second flange is fixedly arranged at one end of the second connecting shell away from the valve body, and a plurality of bolt holes are uniformly distributed in the circumferential direction on the first flange and the second flange.

[0014] Compared with the prior art, the water conveyance valve capable of weakening water hammer pressure has the following advantages:

[0015] The valve plate and the valve plug are tightly combined for sealing to prevent liquid backflow. The liquid flowing back at the water outlet impacts on the conical surface of the valve plate, thereby dispersing the water hammer action acting on the valve plate and avoiding seal failure. When a water hammer effect occurs, the water in the liquid cavity is discharged from the liquid guiding channel to form a damping to buffer the water hammer effect. At the same time, the downward movement speed of the valve plate is reduced to avoid impact and damage between the valve plate and the valve plug. And when the water hammer acts on the piston ring, the gas in the air cavity is compressed, so that an air pressure is formed in the air film cavity to push into the sealing groove by the rubber film ring, further sealing the valve plate and the valve plug to ensure the sealing effect and prevent seal failure, which can effectively extend the service life of the present invention in the process of water conveyance application in municipal pipelines and weaken the influence of the water pressure fluctuation in municipal pipelines on the valve. Description of the Drawings

[0016] Figure 1 is a three-dimensional schematic diagram of the present invention.

[0017] Figure 2 is a top view of the present invention.

[0018] Figure 3 is Figure 2 a partial sectional view at A-A in

[0019] Figure 4 is Figure 3 a partial enlarged view at C in

[0020] Figure 5 is Figure 3 a sectional view at B-B in

[0021] Figure 6 is a three-dimensional sectional view of the present invention.

[0022] Figure 7 is Figure 6 a partial enlarged view at D in

[0023] In the figure: the first connecting shell 10, the valve body 11, the second connecting shell 12, the first flange 13, the second flange 14, the first sealing ring 15, the valve plate 16, the first spring 17, the first sleeve 18, the second sleeve 19, the second sealing ring 20, the piston ring 21, the second spring 22, the liquid cavity 23, the connecting pipe 24, the first air guide channel 25, the valve plug 26, the sealing groove 27, the air film cavity 28, the second air guide channel 29, the air distribution groove 30, the air guide pipe 31, the liquid guide channel 32, the air cavity 33, the first bolt 34, the second bolt 35, the bolt hole 36, the first screw 37, the second screw 38, the water inlet 39, the water outlet 40, the conical surface 41, the liquid discharge port 42, the rubber membrane ring 43. Detailed implementation mode

[0024] The core of the present invention is to provide a water conveyance valve that can weaken the water hammer pressure. Compared with the background technology, it can eliminate the water hammer effect generated after the valve plate is closed, avoid damage caused by the impact of the valve plate and the valve plug, and use the water hammer effect to seal the valve plate and the valve plug to avoid the failure of the check valve.

[0025] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation modes.

[0026] It should be noted here that the upper and lower orientation words involved in this article are defined based on the position of the components in the figure and the relative positions of the components to each other, only for the sake of clarity and convenience of expressing the technical solution. It should be understood that the orientation words adopted in this article should not limit the scope of protection requested by this application. Figures 1 to 7

[0027] Figure 1 Example 1: As Figure 2 , Figure 3 , Figure 4 , Figure 6 , Figure 7 and Figure 7As shown in the figure, a water conveyance valve capable of weakening water hammer pressure includes a first connection shell 10. One end of the first connection shell 10 is fixedly connected to a valve body 11. The first connection shell 10 and the valve body 11 are fixedly connected by a plurality of second bolts 35 evenly distributed in the circumferential direction. A second sleeve 19 is slidably connected to one end of the valve body 11 close to the first connection shell 10. One end of the second sleeve 19 extending out of the valve body 11 extends into the first connection shell 10 and is fixedly connected to the first connection shell 10. A through water inlet 39 is provided in the second sleeve 19. An air guide pipe 31 is fixedly connected in the water inlet 39. One end of the air guide pipe 31 away from the first connection shell 10 is connected to a valve plug 26. The valve plug 26 and the air guide pipe 31 are fixedly connected by a plurality of second screws 38 evenly distributed in the circumferential direction. A first sleeve 18 is slidably connected to the end of the water inlet 39 away from the first connection shell 10. One end of the disc of the first sleeve 18 is in close contact with the inner wall of the valve body 11 and slides relatively. A first spring 17 surrounding the outer side of the first sleeve 18 is fixedly connected between the second sleeve 19 and the first sleeve 18. A valve plate 16 is fixedly connected to the side of the first sleeve 18 away from the second sleeve 19. The first sleeve 18 and the valve plate 16 are fixedly connected by a plurality of first screws 37 evenly distributed in the circumferential direction. A liquid discharge port 42 in close contact with the valve plug 26 is provided at the center of the valve plate 16.

[0028] As Figure 3 and Figure 6 shown in the figure, a piston ring 21 is slidably connected to the outer wall of the second sleeve 19 located in the valve body 11 and is in close contact with the inner wall of the valve body 11 and slides. Second sealing rings 20 fixedly connected to the inner ring and the outer ring of the piston ring 21 are in close contact with the inner wall of the valve body 11 and the outer wall of the second sleeve 19 respectively and slide relatively. A second spring 22 surrounding the outer side of the second sleeve 19 is fixedly connected between the piston ring 21 and one end of the valve body 11 close to the first connection shell 10. An annular liquid chamber 23 is formed between the sides of the piston ring 21 away from the first connection shell 10. An annular air chamber 33 is formed on the side of the piston ring 21 close to the first connection shell 10.

[0029] As Figure 1 , Figure 3 and Figure 6 shown in the figure, a first sealing ring 15 made of rubber is fixedly connected to one end of the valve body 11 away from the first connection shell 10. One end of the first sealing ring 15 extends into the valve body 11 and is in close contact with the inner wall of the valve body 11. The taper of the conical surface of the first sealing ring 15 is the same as that of the conical surface of the liquid guide channel 32. A second connection shell 12 is fixedly connected to the side of the first sealing ring 15 away from the valve body 11. The second connection shell 12, the first sealing ring 15 and the valve body 11 are fixedly and tightly connected by a plurality of first bolts 34 evenly distributed in the circumferential direction. A water outlet 40 penetrating the second connection shell 12 and the first sealing ring 15 is provided at the center of the second connection shell 12.

[0030] AsFigure 1 , Figure 2 , Figure 3 and Figure 6 As shown in Figure 3 , Figure 6 , at one end of the first connecting shell 10 away from the valve body 11, a first flange 13 is fixedly arranged, and at one end of the second connecting shell 12 away from the valve body 11, a second flange 14 is fixedly arranged. A plurality of bolt holes 36 are evenly distributed in the circumferential direction on the first flange 13 and the second flange 14.

[0031] In this embodiment, the present invention is vertically placed and connected in the conveying pipeline through the first flange 13 and the second flange 14. When the device is in the initial state, the valve plate 16 and the valve plug 26 are in a combined state. When water flows into the present invention from one side of the water inlet 39, the water flow impacts the liquid discharge port 42, causing the valve plate 16 to move upward and separate from the valve plug 26. The water flow flows from the liquid discharge port 42 to the water outlet 40, enabling the liquid to be smoothly conveyed in the pipeline. During the upward movement of the valve plate 16, the volume of the liquid chamber 23 increases, and a part of the water flowing out from the liquid discharge port 42 is sucked into the liquid chamber 23 from the liquid guiding channel 32 until the valve plate 16 moves up to the first sealing ring 15, and the first sealing ring 15 blocks the liquid guiding channel 32 and the liquid chamber 23 no longer absorbs water.

[0032] When no more liquid is injected into the water inlet 39, the first sleeve 18 resets under the action of the reverse water flow and the elastic tension of the first spring 17. During the downward movement of the valve plate 16, the liquid in the liquid chamber 23 is continuously discharged from the liquid guiding channel 32. The liquid forms a damping effect when passing through the liquid guiding channel 32, slowing down the downward movement speed of the valve plate 16, thereby achieving the effect of slow closing, avoiding the water hammer effect acting on the valve plate 16, and preventing impact and damage between the valve plate 16 and the valve plug 26. Until the valve plate 16 is combined with the valve plug 26 again for sealing to prevent liquid backflow and achieve the check valve effect. At this time, the liquid discharged from the water outlet 40 of the present invention forms a water hammer effect under the action of gravity. The reverse water flow impacts on the conical surface of the valve plate 16 and spreads towards the periphery of the valve plate 16, thereby increasing the contact area between the water flow and the valve plate 16 and dispersing the water hammer action acting on the valve plate 16 to avoid seal failure.

[0033] When the valve plate and the valve plug are closed for sealing, since the reverse water flow generating the water hammer effect can enter the liquid chamber 23 from 32, the static pressure at the valve plate 16 and the valve plug 26 is eliminated, avoiding damage to the sealing surfaces of the valve plate 16 and the valve plug 26 and ensuring the stability of the seal.

[0034] Embodiment 2: As a further embodiment, as shown in Figure 3 and Figure 6As shown, a piston ring 21 that is in sliding connection with the outer wall of the second sleeve 19 inside the valve body 11 is in close-fitting sliding connection with the inner wall of the valve body 11. Second sealing rings 20 that are respectively in close-fitting relative sliding connection with the inner wall of the valve body 11 and the outer wall of the second sleeve 19 are fixedly connected to the inner ring and the outer ring of the piston ring 21. A second spring 22 that surrounds the outside of the second sleeve 19 is fixedly connected between the piston ring 21 and one end of the valve body 11 close to the first connection shell 10. An annular liquid cavity 23 is formed between the sides of the piston ring 21 away from the first connection shell 10, and an annular air cavity 33 is formed on the side of the piston ring 21 close to the first connection shell 10.

[0035] As Figure 3 and Figure 6 shown, a through first air guide channel 25 is provided in the air guide pipe 31. A plurality of connecting pipes 24 are fixedly connected to the position of the air cavity 33 corresponding to one end of the valve body 11 close to the first connection shell 10 in a circumferential direction and are evenly distributed. One end of each connecting pipe 24 away from the valve body 11 bends towards the axis direction of the second sleeve 19, passes through the second sleeve 19, and is fixedly connected to the air guide pipe 31. The connecting pipes 24 communicate the air cavity 33 with the first air guide channel 25.

[0036] As Figure 3 、 Figure 5 、 Figure 6 and Figure 7 shown, a gas distribution groove 30 communicating with the first air guide channel 25 is provided inside the valve plug 26 on the side close to the first air guide channel 25. An annular air film cavity 28 is provided on the outer conical surface of the valve plug 26. A plurality of second air guide channels 29 communicating the air film cavity 28 and the gas distribution groove 30 are provided in the valve plug 26 between the air film cavity 28 and the gas distribution groove 30 in a circumferential direction and are evenly distributed. An annular sealing groove 27 is provided on the conical surface where the valve plate 16 contacts the valve plug 26 at the position corresponding to the air film cavity 28. A rubber film ring 43 is fixedly connected in the air film cavity 28. A plurality of liquid guide channels 32 that penetrate the first sleeve 18 and communicate with the liquid cavity 23 are provided in the valve plate 16 at the position corresponding to the first sealing ring 15 in a circumferential direction and are evenly distributed. A conical surface 41 is provided on the side of the valve plate 16 close to the second sleeve 19 and close to the valve plug 26.

[0037] In this embodiment, when the device is in the initial state, there is residual liquid in the liquid chamber 23. Under the action of gravity, the residual liquid presses down the piston ring 21, causing the gas in the air chamber 33 to rush into the air film chamber 28, thereby expanding the rubber film ring 43. The expanded rubber film ring 43 enters the sealing groove 27 to fix the valve plate 16 and the valve plug 26, preventing the valve plate 16 from detaching from the valve plug 26 under the elastic action of the first spring, resulting in sealing failure. When the water flow enters the present invention from the side of the water inlet 39, the water flow impacts the valve plate 16, causing the valve plate 16 to move upward. The volume in the liquid chamber 23 increases to form a low pressure, causing the piston ring 21 to move upward, reducing the air pressure in the air chamber 33, and causing the rubber film ring 43 to contract. The valve plate 16 and the valve plug 26 are smoothly separated.

[0038] When the water hammer effect occurs, the valve plate 16 moves downward under the action of the reverse water flow and the first spring 17. The pressure in the liquid chamber 23 increases, causing the piston ring 21 to move downward against the elasticity of the second spring 22, thereby using the elasticity of the second spring 22 and the damping formed at the liquid guide channel 32 to buffer the water hammer effect, thereby reducing the water hammer effect and preventing the water hammer effect from acting on the pump body and damaging the pump body.

[0039] At the same time, the piston ring 21 moves downward to compress the air in the air chamber 33. The air in the air chamber 33 enters the first air guide channel 25 from the connecting pipe 24 and finally enters the air film chamber 28, causing the rubber film ring 43 to bulge, thereby further sealing the valve plug 26 and the valve plate 16, preventing the water hammer effect from impacting the valve plate 16 and the valve plug 26 and causing a gap between the two, resulting in sealing failure. At the same time, it plays a role in locking the valve plate 16 and the valve plug 26. When injecting liquid into the water inlet 39 while the water hammer effect occurs, the valve plate 16 will not open, preventing the opposing water flows from impacting each other and damaging the device.

[0040] After the reverse water flow stabilizes and the water hammer effect no longer occurs, the piston ring 21 resets under the action of the second spring 22. At this time, when injecting water flow into the water inlet 39, when the water flow impacts the valve plate 16 and moves upward, the rubber film ring 43 contracts again and detaches from the sealing groove 27, and the valve plate 16 is separated from the valve plug 26 again. When the valve plate 16 is combined with the first sealing ring 15, the first sealing ring 15 seals the liquid guide channel 32 to keep the pressure in the liquid chamber 23 and the air chamber 33 unchanged, preventing the water flow from entering the liquid chamber 23 and causing the rubber film ring 43 to be expanded at this time, resulting in the valve plate 16 being unable to be combined and sealed with the valve plug 26.

[0041] The above description is only an embodiment of the present invention and does not limit the patent protection scope of the present invention. Any equivalent structure or equivalent process transformation made using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. A water conveyance valve capable of weakening water hammer pressure, comprising a valve body (11), characterized in that, A second sleeve (19) is slidably connected to the center of the bottom of the valve body (11). A valve plate component is arranged inside one end of the second sleeve (19) extending into the valve body (11). The valve plate component is in close contact with and relatively slides along the inner wall of the valve body (11). A piston component is arranged between the outer wall of the second sleeve (19) and the inner wall of the valve body (11). A gas guide pipe (31) is arranged inside the second sleeve (19). The bottom of the piston component passes through the second sleeve (19) and is connected to the four ends on the lower side of the gas guide pipe (31). A valve plug (26) that forms a seal with the valve plate component is arranged at one end of the gas guide pipe (31) close to the valve plate component. An air distribution groove (30) is formed inside the valve plug (26). An air film cavity (28) is formed on the conical surface of the valve plug (26). A plurality of second air guide channels (29) are formed in the air film cavity (28). A sealing groove (27) is formed on the valve plate (16) at a position corresponding to the air film cavity (28). A rubber film ring (43) is fixedly connected inside the air film cavity (28). The valve plate component includes a first sleeve (18). The first sleeve (18) is slidably connected to the inner wall of the second sleeve (19). A valve plate (16) is fixedly connected to one end of the first sleeve (18) away from the second sleeve (19). The valve plate (16) is in close contact with and relatively slides along the inner wall of the valve body (11). Three liquid guide channels (32) are evenly distributed in the circumferential direction at the edges of the valve plate (16) and the first sleeve (18). A conical surface (41) is formed on the inner ring of the valve plate (16) close to the valve plug (26). The piston component includes a piston ring (21). Two second sealing rings (20) are fixedly connected to the outer ring and the inner ring of the piston ring (21). The two second sealing rings (20) are in close contact with and relatively slide between the outer wall of the second sleeve (19) and the inner wall of the valve body (11). An air cavity (33) is formed among the outer wall of the second sleeve (19), the inner wall of the valve body (11), and the piston ring (21).

2. The water conveyance valve capable of weakening water hammer pressure according to claim 1, wherein The valve plate (16) and the first sleeve (18) are fixedly connected by three first screws (37) evenly distributed in the circumferential direction. A first spring (17) surrounding the outside of the first sleeve (18) is fixedly connected between the first sleeve (18) and the second sleeve (19).

3. A water conveyance valve capable of weakening water hammer pressure according to claim 1, characterized in that, A second spring (22) is fixedly connected between the piston ring (21) and the bottom of the valve body (11). Four connecting pipes (24) are fixedly connected to the bottom of the valve body (11) evenly distributed. One end of each connecting pipe (24) away from the valve body (11) passes through the second sleeve (19) and is fixedly connected to the second sleeve (19). The four ends of the four connecting pipes (24) extending into the second sleeve (19) extend into the four ends at the bottom of the gas guide pipe (31).

4. The water conveyance valve capable of weakening water hammer pressure according to claim 1, characterized in that, The lower end of the valve body (11) is fixedly connected to a first connecting shell (10). The first connecting shell (10) is fixedly connected to one end of the second sleeve (19) extending out of the valve body (11). The first connecting shell (10) encloses four connecting pipes (24) therein. The first connecting shell (10) and the valve body (11) are tightly connected by a set of evenly distributed second bolts (35).

5. The water conveyance valve capable of weakening water hammer pressure according to claim 4, wherein One end of the first connecting shell (10) away from the valve body (11) is provided with a first flange (13), and a plurality of bolt holes (36) are evenly distributed on the first flange (13).

6. The water conveyance valve capable of weakening water hammer pressure according to claim 4, wherein One end of the valve body (11) away from the first connecting shell (10) is connected to a first sealing ring (15). One side of the first sealing ring (15) away from the valve body (11) is connected to a second connecting shell (12). The second connecting shell (12), the first sealing ring (15) and the valve body (11) are fixedly and tightly connected by a set of evenly distributed first bolts (34).

7. A water conveyance valve capable of weakening water hammer pressure according to claim 6, wherein One end of the second connecting shell (12) away from the valve body (11) is fixedly provided with a second flange (14), and a plurality of bolt holes (36) are evenly distributed in the circumferential direction on the second flange (14).

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