Pressure stabilizing water valve

Abstract

The utility model discloses a pressure stabilizing water valve which comprises a valve body, the valve body is provided with a water passing cavity, the water passing cavity is divided into a water inlet sub-cavity and a water outlet sub-cavity, a throttling opening is formed at the boundary, the valve body is further provided with a piston cavity, the pressure stabilizing water valve further comprises a water-saving rubber mat, a piston, a piston rod and a spring, the water-saving rubber mat is located in the water inlet sub-cavity, and the piston is located in the piston cavity. The piston is located in the piston cavity in a sealed and sliding mode and divides the piston cavity into a spring containing cavity and an adjusting water cavity, a cavity wall shared by the adjusting water cavity and the water outlet sub-cavity is provided with a water inlet hole and a water drainage hole, and the one-way valve allows water to enter the adjusting water cavity through the water inlet hole. The piston rod can penetrate through the cavity wall shared by the adjusting water cavity and the water outlet sub-cavity in a sealed and sliding mode, and the head end and the tail end of the piston rod are connected with the water-saving rubber mat and the piston respectively. The adjusting water cavity slowly relieves pressure through the water drainage hole to open a large throttling opening in the water-saving rubber mat to form a damping effect, and the water attack effect in the pipeline is effectively prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to a steady pressure valve, in particular to a steady pressure water valve with damping function. BACKGROUND

[0002] In life, whether it is industrial water or domestic water, safe water and water saving are the focus of society. Water tower water supply, high pressure pipeline water supply, water pump water supply and the like are several main water supply modes, and unpressurized water is pressurized and delivered to users through a pipeline for ready use. Due to different use scenarios and different distances of water supply, the actual water pressure experienced by different users is also different, which brings different safety hazards and water waste problems to different water products. In order to realize relatively stable water pressure, users usually set a steady pressure valve in the waterway, although the steady pressure valve can reduce the water pressure of the water inlet end during water use, but it cannot protect the water outlet end pressure in the closed water use state, and if the water pressure of the pipeline continuously increases at this time, it will inevitably threaten the performance of the water outlet component. Moreover, the existing steady pressure valve mainly plays a role in pressure reduction, and if the water outlet end suddenly appears a large pressure relief, the water hammer effect is very easy to occur in the pipeline, thereby causing damage to the pipeline, valve and other accessories. SUMMARY

[0003] The utility model provides a steady pressure water valve, can not only play a stabilizing role to the dynamic water pressure of water inlet end, but also can play a stabilizing role to the static water pressure of water outlet end, and can effectively reduce the occurrence of water hammer effect. The utility model solves the technical scheme adopted by the technical problem:

[0004] The steady pressure water valve comprises a valve body, the valve body is provided with a water passing cavity, the water passing cavity is divided into a water inlet sub-cavity and a water outlet sub-cavity and forms a throttling opening at the boundary, the valve body is further provided with a piston cavity, further comprises a water saving rubber pad, a piston, a piston rod and a spring, the water saving rubber pad is located in the water outlet sub-cavity, the piston is sealingly and slidably located in the piston cavity and divides the piston cavity into a spring cavity and an adjusting water cavity, a cavity wall shared by the adjusting water cavity and the water outlet sub-cavity is provided with a water inlet hole and a water discharge hole, the water passing area of the water inlet hole is at least five times that of the water discharge hole, further comprises a check valve allowing water to pass through the water inlet hole into the adjusting water cavity and preventing water from flowing back to the water outlet sub-cavity through the water inlet hole, the piston rod can sealingly and slidably pass through the cavity wall shared by the adjusting water cavity and the water inlet sub-cavity and is connected with the water saving rubber pad and the piston at the two ends respectively, the spring is located in the spring cavity and indirectly applies an elastic force to the water saving rubber pad to open the throttling opening, and the adjusting water cavity pushes the piston, the piston rod and the water saving rubber pad to move synchronously during expansion, so that the water saving rubber pad gradually closes the throttling opening.

[0005] In a preferred embodiment, the one-way valve is a rubber sheet structure arranged in the regulating water chamber and abutting against the wall surface of the chamber wall shared by the regulating water chamber and the water passing chamber, and the one-way valve is provided with a movable vane corresponding to the position of the water inlet hole.

[0006] In a preferred embodiment, the chamber wall shared by the regulating water chamber and the water inlet sub-chamber is provided with a cylinder wall extending towards the side of the regulating water chamber, the piston rod passes through the cylinder wall and a sealing ring is arranged therebetween, the inner wall of the cylinder wall is provided with a guide rib, and the outer contour of the cylinder wall is non-circular, and the one-way valve is sleeved on the cylinder wall.

[0007] In a preferred embodiment, a rotation-stopping pad and a gland are further included, the rotation-stopping pad is sleeved on the cylinder wall and stacked on the one-way valve, and the gland is connected to the cylinder wall and tightly fixes the sealing ring on the cylinder wall.

[0008] In a preferred embodiment, the regulating water chamber and the water inlet sub-chamber also share a chamber wall.

[0009] In a preferred embodiment, the valve body is a three-way pipe fitting having three left and right lower interfaces, the left interface serves as the water inlet sub-chamber, the right interface and the lower interface serve as the water outlet sub-chamber, the water-saving rubber pad is located in the lower interface, the valve body is provided with the piston chamber at the upper portion, the piston chamber outlet and the lower interface are both provided with end covers, the throttling hole faces the lower interface, and the side wall of the throttling hole facing the right interface is connected to the bottom wall of the piston chamber.

[0010] In a preferred embodiment, the spring cavity is a gas-tight chamber, or a gas hole is arranged on the end cover connected to the piston chamber.

[0011] In a preferred embodiment, the water-saving rubber pad is conical, or the throttling hole is conical, the water-saving rubber pad is sleeved on the piston rod, a pressing disc is screwed on the end portion of the piston rod, and the pressing disc tightly fixes the water-saving rubber pad on the piston rod.

[0012] In a preferred embodiment, a pressing cap is screwed on the piston rod, the piston is sleeved on the piston rod, the pressing cap tightly fixes the piston on the piston rod, and one end of the spring is sleeved on the pressing cap.

[0013] In a preferred embodiment, the steady pressure water valve comprises a valve body and a piston, the valve body is provided with a water passing cavity, characterized in that the valve body is further provided with a piston cavity, the piston is sealingly and slidingly located in the piston cavity and surrounds an adjusting water cavity, the valve body is provided with a water inlet hole connecting the adjusting water cavity and the water passing cavity, further comprising a one-way valve allowing water to pass through the water inlet hole into the adjusting water cavity and preventing water from flowing back to the water passing cavity through the water inlet hole, the valve body is provided with a water outlet hole connecting the adjusting water cavity and the water passing cavity, the water passing area of the water inlet hole is eight to twenty times of the water passing area of the water outlet hole.

[0014] Compared with the background art, the technical scheme has the following advantages:

[0015] 1. The water in the water outlet sub-cavity can quickly enter the adjusting water cavity through the water inlet hole. If the water pressure in the water outlet sub-cavity continues to increase, the water pressure in the adjusting water cavity also synchronously increases, overcomes the elastic force of the spring and pushes the piston to move to increase the space of the adjusting water cavity. The piston drives the piston rod and the water-saving rubber pad to move synchronously, so that the water-saving rubber pad gradually closes the throttle to achieve the effect of quickly reducing the water flow pressure. At the same time, the water in the adjusting water cavity can slowly flow to the water outlet sub-cavity through the pressure relief hole and be discharged from the water outlet sub-cavity. Finally, the pressures of the spring, the adjusting water cavity and the water outlet sub-cavity are self-adaptively adjusted to tend to balance, achieving the effect of the steady pressure water valve maintaining dynamic balance water outlet.

[0016] 2. If the water outlet end closes the water outlet, that is, the working state of the steady pressure water valve without water outlet, once the water pressure in the pipeline continues to increase, the adjusting water cavity continuously pushes the piston until the water-saving rubber pad completely closes the throttle, thereby cutting off the communication relationship between the water inlet sub-cavity and the water outlet sub-cavity, which protects the water-using equipment downstream of the steady pressure water valve.

[0017] 3. If the rear-end drainage speed increases, for example, multiple water-using equipment are opened at the same time, at this time, the water outlet sub-cavity is in a state of rapid pressure relief. The spring pushes the piston to move to open the throttle. However, due to the limitation of the one-way valve, the water in the adjusting water cavity cannot quickly flow out through the water inlet hole, but can only slowly flow to the water outlet sub-cavity through the water outlet hole, that is, the adjusting water cavity discharges slowly. Therefore, the moving speed of the piston is delayed, that is, the piston movement is damped. Finally, the opening of the throttle slowly increases, effectively preventing the occurrence of water hammer effect. Finally, the pressures of the spring, the adjusting water cavity and the water outlet sub-cavity are still self-adaptively adjusted to tend to balance.

[0018] 4. The one-way valve adopts a film structure, which is simple in structure and directly attached to the wall surface of the adjusting water cavity, and is easy to install.

[0019] 5. The guide ribs improve the smoothness of the piston rod movement, the outer contour of the cylinder wall is non-circular, preventing the one-way valve from rotating, and the movable blade better closes the water inlet hole. Further, the rotation-stopping pad can further prevent the one-way valve from rotating.

[0020] 6. The adjusting water cavity and the water inlet sub-cavity also have a shared cavity wall, the adjusting water cavity, the water inlet sub-cavity and the water outlet sub-cavity are arranged compactly in space, the valve body is subjected to more uniform force, and the pressure resistance is higher.

[0021] 7. The valve body adopts a three-way pipe fitting, the water-saving rubber pad is located at the lower interface, assembly is facilitated, and the piston cavity is located at the upper part of the valve body, and the structure is balanced. Further, when the piston cavity is a non-airtight chamber, the spring mainly relies on the elastic force and the friction force to resist the expansion energy of the adjusting water cavity, the adjusting flexibility is greater, the spring can be selected in different specifications according to the required value, and use is simple; or when the piston cavity is an airtight chamber, the spring cavity is also an airtight chamber, the adjusting water cavity needs to do work on the air in the spring cavity to be extruded, the resistance is greater, and the adjusting limit force is greater. BRIEF DESCRIPTION OF DRAWINGS

[0022] The utility model will be further described below in combination with the drawings and embodiments.

[0023] Figure 1 An exploded schematic view of the pressure-stabilizing water valve is shown.

[0024] Figure 2 A schematic view of a valve body of the pressure-stabilizing water valve is shown. Figure 1

[0025] A schematic view of a one-way valve of the pressure-stabilizing water valve is shown. Figure 3 Figure 1 A schematic view of the pressure-stabilizing water valve in a natural state is shown.

[0026] Figure 4 A schematic view of the pressure-stabilizing water valve in a pressure-reducing state is shown. Figure 1

[0027] A schematic view of the pressure-stabilizing water valve in a pressure-reducing state is shown. Figure 5 Figure 1 A schematic view of the pressure-stabilizing water valve in a pressure-reducing state is shown.

[0028] Figure 6 Figure 1 A schematic view of the pressure-stabilizing water valve in a pressure-reducing state is shown.

[0029] Figure 7 A schematic view of the pressure-stabilizing water valve in a pressure-reducing state is shown. Figure 1

[0030] A schematic view of the pressure-stabilizing water valve in a pressure-reducing state is shown. Figure 8 Figure 1 A schematic view of the pressure-stabilizing water valve in a pressure-reducing state is shown.

[0031] Please refer to Figures 1 to 8 ​​​​​, the valve body is provided with a water passing cavity and a piston cavity, the water passing cavity is divided into a water inlet sub-cavity 11 and a water outlet sub-cavity 12 and forms a throttling port 13 at the boundary, water enters from the water inlet sub-cavity 11, enters the water outlet sub-cavity 12 from the throttling port 13 and finally flows out. It also includes a water saving rubber pad 20, a piston 30, a piston rod 40 and a spring 50, the water saving rubber pad 20 is located in the water outlet sub-cavity 12 and is used to close the throttling port 13, the closing can be partial or complete, that is, the water saving rubber pad is used to close the throttling port or even completely close the throttling port, and in the opening process, the water saving rubber pad opens the throttling port or even completely opens the throttling port.

[0032] The piston 30 is sealingly and slidingly located in the piston cavity and divides the piston cavity into a spring cavity 14 and an adjusting water cavity 15, those skilled in the art know that sealing sliding means that the piston can not only slide in the piston cavity, but also has a sealing connection relationship with the cavity wall of the piston cavity, in addition, the sliding of the piston 30 causes the adjusting water cavity 15 to increase while the spring cavity 14 to decrease, and causes the adjusting water cavity 15 to decrease while the spring cavity 14 to increase. The function of the piston 30 is to drive the water saving rubber pad 20 to move to close or open the throttling port 13.

[0033] The valve body 10 is provided with a water inlet hole and a water outlet hole 17 communicating the adjusting water cavity 15 and the water passing cavity, preferably, the valve body 10 is provided with a water inlet hole 16 and a water outlet hole 17 at the cavity wall shared by the adjusting water cavity 15 and the water outlet sub-cavity 12, the water passing area of the water inlet hole 16 is at least five times, preferably at least eight times, the water passing area of the water outlet hole 17, and the area ratio of the two in the embodiment is eight to twelve, in this way, water in the water outlet sub-cavity 12 or the water passing cavity can quickly enter the adjusting water cavity 15 through the water inlet hole 16, which can make water quickly enter the adjusting water cavity 15 when the water pressure at the water inlet end increases rapidly to achieve rapid throttling. However, the water in the adjusting water cavity 15 can only slowly flow to the water outlet sub-cavity 12 from the water outlet hole 17, which can prevent the water in the adjusting water cavity 15 from quickly flowing out under the condition of rapid pressure relief at the water outlet end to slow down the movement of the piston to slow down the speed of opening the throttling port. The water passing hole 16 can be one or multiple, the area refers to the area of all water passing holes, of course, also refers to the area of all water outlet holes. It also includes a check valve 60 that allows water to pass through the water inlet hole 16 into the adjusting water cavity 15 and prevents water from flowing back to the water outlet sub-cavity 13 through the water inlet hole 16, that is, the check valve 60 makes the water inlet hole 16 a one-way hole.

[0034] The piston rod 40 can sealingly and slidingly pass through the cavity wall shared by the adjusting water cavity 15 and the water inlet sub-cavity 11 and is connected to the water saving rubber pad 20 and the piston 30 at the two ends respectively, sealing sliding also means that the piston rod can slide and has a sealing relationship with the cavity wall.

[0035] The spring 50 is located in the spring cavity 14 and indirectly applies elastic force to the water-saving rubber pad 20 to open the throttling hole 13, that is, in the natural state, the spring pushes the water-saving rubber pad 20 away from the throttling hole 13, that is, the throttling hole 13 is in the open state in the natural state, at this time, the adjusting water cavity 15 is smallest and the spring cavity 14 is largest. When the pressure in the adjusting water cavity 15 increases and is sufficient to push the piston 30 to slide, the adjusting water cavity 15 pushes the piston 30, the piston rod 40 and the water-saving rubber pad 20 to move synchronously during the expansion process, so that the water-saving rubber pad 20 gradually closes the throttling hole 13, and the gradual closing is a process, which means that the throttling hole 13 can be closed small, and also means that the throttling hole 13 can be completely closed.

[0036] During the water flow through the pressure stabilizing water valve, the water rushes through the water inlet hole 16 to open the one-way valve 60 and quickly enters the adjusting water cavity 15. If the water pressure is small, as shown in Figure 4 , the water pressure of the adjusting water cavity cannot drive the piston 30 to move, and under the action of the spring 50, the water-saving rubber pad 20 opens the throttling hole 13 to the maximum, that is, remains in the natural state; if the water pressure increases, in the initial stage, as shown in Figure 5 and 6 , the pressure in the adjusting water cavity increases and drives the piston 30 to move, and the piston pulls the water-saving rubber pad 20 to move synchronously through the piston rod 40, gradually closes the throttling hole 13, and achieves the pressure reduction effect. Of course, if the water pressure is large enough, the water-saving rubber pad 20 can also gradually close the throttling hole 13 or even completely close the throttling hole 13. At the same time, the water in the adjusting water cavity 15 can also slowly discharge through the drain hole 17, and finally, as shown in Figure 7 , the water-saving rubber pad 20 is self-adaptively adjusted to a suitable position according to the water outlet speed of the water outlet sub-cavity 12, the elastic force of the spring 50 and the discharge speed of the drain hole 17, and the pressure stabilization effect is achieved, that is, the dynamic balance of water outlet; if the water outlet speed of the water outlet sub-cavity 12 increases, such as the rear drainage opening is enlarged or the water consumption increases, the water pressure of the water outlet sub-cavity 12 rapidly decreases, and the spring 50 pushes the water-saving rubber pad 20 to open the throttling hole 13 through the piston 30 and the piston rod 40. However, under the blockage of the one-way valve 60, the water in the adjusting water cavity 15 cannot be quickly discharged from the water inlet hole, as shown in Figure 8 , but can only slowly flow out through the drain hole 17, so the speed of the adjusting water cavity 15 is slowed down, the movement of the piston is slowed down, and the speed of the throttling hole 13 is also slowed down, and finally the water-saving rubber pad 20 is self-adaptively adjusted to a suitable position to achieve the dynamic balance of water outlet, so the slow discharge of the adjusting water cavity 15 through the drain hole 17 forms a damping effect on the opening of the throttling hole 13 by the water-saving rubber pad 20, effectively preventing the water hammer effect in the pipeline.

[0037] Preferably, when the water area of the inlet hole 16 is between five times and twenty times the water area of the outlet hole 17, the sensitivity of pressure reduction and pressure stabilization and the effect of damping are better coordinated.

[0038] Preferably, the one-way valve 60 is a film structure arranged in the regulating water chamber 15 and abutting against the wall surface of the chamber wall shared by the regulating water chamber and the water passing chamber, and the one-way valve 60 is provided with a movable vane 62 corresponding to the position of the inlet hole 16. The number of inlet holes 16 can be set as needed, and the water flow can push away the movable vane 62 to enter the regulating water chamber 15 from the inlet hole 16 in the water outlet sub-chamber 12, but in the opposite direction, the movable vane 62 abuts against the wall surface of the regulating water chamber 15, so that water cannot pass through the inlet hole in the opposite direction.

[0039] Preferably, the chamber wall shared by the regulating water chamber 15 and the water inlet sub-chamber 11 is provided with a cylinder wall 18 extending towards the side of the regulating water chamber 15, and the piston rod 40 passes through the cylinder wall 18 and a sealing ring 70 is arranged therebetween. Further preferably, the inner wall of the cylinder wall 18 is provided with a guide rib 182, so as to reduce the friction area when the piston rod slides. Further preferably, the outer contour of the cylinder wall 18 is non-circular, such as hexagonal, and the one-way valve 60 is sleeved on the cylinder wall 18.

[0040] Preferably, a rotation-stopping pad 80 is sleeved on the cylinder wall 18 and stacked on the one-way valve 60, and a gland 90 is connected to the cylinder wall 18 and tightly fixes the sealing ring 70 on the cylinder wall 18. In this embodiment, the cylinder wall 18 is provided with a recess on the inside of the opening position for placing the sealing ring, and the gland 90 is connected to the cylinder wall 18 and tightly fixes the sealing ring 70 in the recess.

[0041] Preferably, the regulating water chamber 15 and the water inlet sub-chamber 11 also have a shared chamber wall.

[0042] Preferably, the valve body 10 is a three-way pipe fitting, having three interfaces on the left and right and below, the left interface serving as the water inlet sub-chamber 11, the right interface and the lower interface serving as the water outlet sub-chamber 12, the water-saving rubber pad 20 being located in the lower interface, and the valve body being provided with the piston chamber in the upper part, thus having an appearance similar to a four-way pipe fitting. The outlet of the piston chamber and the lower interface are both provided with an end cover 19, the throttle hole 13 faces the lower interface, and the side wall of the throttle hole 13 facing the right interface is connected to the bottom wall of the piston chamber, thus increasing the strength of the piston chamber.

[0043] Preferably, the spring cavity 14 is an air-tight chamber, for example, the end cap 19 seals the piston cavity, so that the volume of the spring cavity 14 is reduced, and the energy of the compressed air also needs to be overcome. Of course, the spring cavity 14 can also be a non-airtight chamber, for example, the end cap 19 connected to the piston cavity is provided with a gas hole.

[0044] Preferably, the water-saving rubber pad 20 is conical (as shown in the figure), or the throttle hole 13 is conical, the water-saving rubber pad 20 is sleeved on the piston rod 40, the pressure plate 42 is screwed on the end of the piston rod 40, and the pressure plate 42 tightly fixes the water-saving rubber pad 20 on the piston rod 40.

[0045] Preferably, the pressure cap 44 is screwed on the piston rod 40, the piston 30 is sleeved on the piston rod 40, the pressure cap 44 tightly fixes the piston 30 on the piston rod 40, and one end of the spring is sleeved on the pressure cap.

[0046] The above is only the preferred embodiment of the present application, and therefore cannot limit the scope of the present application, that is, equivalent changes and modifications made according to the scope of the present application and the content of the specification should still be within the scope of the present application.

Claims

1. A steady pressure water valve comprising a valve body, the valve body being provided with a water passing cavity, the water passing cavity being divided into a water inlet sub-cavity and a water outlet sub-cavity and forming a throttling opening at the boundary, characterized in that: The valve body is also provided with a piston cavity, and further comprises a water-saving rubber pad, a piston, a piston rod and a spring, the water-saving rubber pad is located in the water outlet sub-cavity, the piston is sealingly and slidingly located in the piston cavity and divides the piston cavity into a spring cavity and an adjusting water cavity, the cavity wall shared by the adjusting water cavity and the water outlet sub-cavity is provided with a water inlet hole and a water outlet hole, the water inlet hole has a water passing area which is at least five times of that of the water outlet hole, and further comprises a one-way valve which allows water to pass through the water inlet hole into the adjusting water cavity and prevents water from flowing back to the water outlet sub-cavity through the water inlet hole, the piston rod sealingly and slidingly penetrates the cavity wall shared by the adjusting water cavity and the water inlet sub-cavity and is connected to the water-saving rubber pad and the piston at two ends respectively, and the spring is located in the spring cavity and indirectly applies an elastic force to the water-saving rubber pad to open the throttle.

2. The pressure compensated water valve of claim 1, wherein: The one-way valve is a rubber sheet structure and is arranged in the adjusting water cavity and abuts against the wall surface of the cavity wall shared by the adjusting water cavity and the water passing cavity, and the one-way valve is provided with a movable vane at a position corresponding to the water inlet hole.

3. The pressure compensated water valve of claim 2, wherein: The cavity wall shared by the adjusting water cavity and the water inlet sub-cavity is provided with a cylinder wall extending towards the adjusting water cavity, the piston rod penetrates the cylinder wall and a sealing ring is arranged between the piston rod and the cylinder wall, the inner wall of the cylinder wall is provided with guide ribs, and the outer contour of the cylinder wall is non-circular, and the one-way valve is sleeved on the cylinder wall.

4. The pressure compensated water valve of claim 3, wherein: Further comprising a rotation-stopping pad and a gland, the rotation-stopping pad is sleeved on the cylinder wall and is stacked on the one-way valve, and the gland is connected to the cylinder wall and tightly fixes the sealing ring on the cylinder wall.

5. The pressure compensated water valve of claim 1, wherein: The cavity wall shared by the adjusting water cavity and the water inlet sub-cavity is also shared by the adjusting water cavity and the water passing cavity.

6. The pressure compensated water valve of claim 5, wherein: The valve body is a three-way pipe fitting and has three left and right lower interfaces, the left interface serves as the water inlet sub-cavity, the right interface and the lower interface serve as the water outlet sub-cavity, the water-saving rubber pad is located in the lower interface, the valve body is provided with the piston cavity at the upper portion, the outlet of the piston cavity and the lower interface are both provided with end covers, the throttle is directed towards the lower interface, and the side wall of the throttle directed towards the right interface is connected to the bottom wall of the piston cavity.

7. The pressure compensated water valve of claim 6, wherein: The spring cavity is a gas-tight chamber, or the end cover connected to the piston cavity is provided with a gas hole.

8. The pressure compensated water valve of claim 1, wherein: The water-saving rubber pad is conical, or the throttle is conical, the water-saving rubber pad is sleeved on the piston rod, a pressing disc is screwed on the end of the piston rod, and the pressing disc tightly fixes the water-saving rubber pad on the piston rod.

9. The pressure compensated water valve of claim 1, wherein: A pressing cap is screwed on the piston rod, the piston is sleeved on the piston rod, the pressing cap tightly fixes the piston on the piston rod, and one end of the spring is sleeved on the pressing cap.

10. A pressure-stabilized water valve comprising a valve body and a piston, the valve body being provided with a water passing cavity, characterized in that: The valve body is further provided with a piston cavity, the piston seal is slidably located in the piston cavity and encloses a regulating water cavity, the valve body is provided with a water inlet hole communicating the regulating water cavity and the water passing cavity, and further comprises a one-way valve allowing water to enter the regulating water cavity through the water inlet hole and preventing water from flowing back to the water passing cavity through the water inlet hole, the valve body is provided with a water outlet hole communicating the regulating water cavity and the water passing cavity, the water passing area of the water inlet hole is eight to twenty times the water passing area of the water outlet hole, and the one-way valve is a structure of a rubber sheet, which is arranged in the regulating water cavity and abuts against the cavity wall surface of the regulating water cavity.

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