Drip-proof valve

Abstract

The invention provides a drip-proof valve, and relates to the technical field of valve leakage prevention, the drip-proof valve comprises a top sleeve, a threaded sleeve is arranged on the inner side wall of the upper end of the top sleeve, a valve rod is in threaded connection in the threaded sleeve, the valve rod is in sliding connection with the top sleeve, a valve clack is connected to the lower end face of the valve rod, and a bottom sleeve is arranged on the lower end face of the top sleeve. One end of the bottom sleeve is connected with a water inlet pipe, and the other end is connected with a water outlet pipe; the drip-proof valve further comprises a pressure reducing mechanism, the pressure reducing mechanism comprises communicating pipes, three sets of communicating pipes are arranged on the surface of the water inlet pipe, three sets of water inlet grooves corresponding to the communicating pipes are formed in the inner wall of the water inlet pipe, pressed blocks are arranged in the communicating pipes, and pressing rods are arranged on the lower end faces of the pressed blocks. And the water flow fluctuation pressure when the valve is closed is effectively eliminated.

Description

Technical Field

[0001] This invention relates to the field of valve leak prevention technology, and more specifically, to a drip-proof valve. Background Technology

[0002] In existing pipeline fluid control systems, when a valve is closed, the fluid, which was previously in a stable flow state, undergoes a change in flow state due to the sharp reduction in the flow cross-section. This sudden interruption of flow causes pressure fluctuations in the inlet pipe. Furthermore, even when the valve is fully closed, the water flow in the inlet pipe is still affected by various factors, resulting in continuous pressure fluctuations. These pressure fluctuations originate from various dynamic disturbances during pipeline system operation, including the start-up and shutdown of upstream pumping stations, the opening and closing of other valves, periodic changes in network load, natural fluctuations in water source pressure, and other pipeline-related factors. Fluid dynamic phenomena such as air pockets and water hammer effects in the system cause pressure waves to propagate to the position of a closed valve. Because the valve forms a rigid flow-blocking boundary, the pressure waves cannot continue to propagate downstream. Instead, they are reflected and superimposed at the valve, resulting in pressure concentration and amplification in the upstream area of ​​the valve. Since the closed valve cannot release and dissipate the energy of these pressure fluctuations through fluid flow, the pressure waves form standing wave oscillations in the vicinity of the valve, causing the pressure amplitude in this area to be significantly higher than the pressure level in other parts of the pipeline. This pressure concentration phenomenon will gradually accumulate and intensify over time.

[0003] When the water pressure fluctuations generated in the inlet pipe lack effective buffering and absorption measures, these repeatedly changing pressures will exert a continuous impact on the closed valve, forming a progressive fatigue damage process. When the valve's sealing performance gradually deteriorates due to long-term pressure fluctuation impacts, the fluid medium will leak slightly but continuously through the damaged sealing interface, forming a dripping phenomenon at the valve's outlet. This dripping is often very slight at the beginning and difficult to detect in time, but it will gradually worsen as the sealing damage intensifies, eventually developing into a serious leakage failure. This not only wastes the medium and pollutes the environment, but also affects the working efficiency and safety reliability of the entire pipeline system. Summary of the Invention

[0004] (a) Technical problems to be solved In view of the problems existing in the prior art, the present invention provides an anti-drip valve to solve the technical problems mentioned in the background art.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a drip-proof valve, comprising a top sleeve, a threaded sleeve on the inner side wall of the upper end of the top sleeve, a valve stem threadedly connected to the threaded sleeve, the valve stem being slidably connected to the top sleeve, a valve disc connected to the lower end face of the valve stem, a bottom sleeve on the lower end face of the top sleeve, an inlet pipe connected to one end of the bottom sleeve, and an outlet pipe connected to the other end; further comprising a pressure-reducing mechanism, comprising a connecting pipe, three sets of connecting pipes on the surface of the inlet pipe, three sets of inlet grooves corresponding to the connecting pipes on the inner wall of the inlet pipe, a pressure-receiving block inside the connecting pipe, and a pressure rod on the lower end face of the pressure-receiving block; further comprising a drainage mechanism, comprising a drainage pipe, three sets of drainage pipes, the drainage pipes being disposed inside the valve disc, a sealing disc on the side wall of the drainage pipe, a connecting groove adapted to the sealing disc on the side wall of the drainage pipe, and a hexagonal prism on the other side of the sealing disc.

[0006] Preferably, a sliding sleeve is slidably connected to the surface of the pressure rod, and the sliding sleeve is slidably connected to the inner wall of the connecting pipe. A first compression spring is sleeved on the outer surface of the pressure rod. One end of the first compression spring is fixedly connected to the lower end face of the pressure block, and the other end is fixedly connected to the upper end face of the sliding sleeve. With this structural design, the pressure rod can achieve stable axial sliding movement inside the sliding sleeve. The sliding cooperation between the sliding sleeve and the inner wall of the connecting pipe ensures the stability and reliability of the entire transmission mechanism. The sleeved installation of the first compression spring provides an important elastic buffer function for the system.

[0007] Preferably, a limiting block is provided in the middle of the connecting pipe, located below the sliding sleeve. The lower end of the pressure rod passes through the limiting block and is connected to a second pressure spring. The other end of the second pressure spring is fixedly connected to the bottom of the connecting pipe. The fixed installation of the bottom of the second pressure spring provides a stable basic support and primary elastic buffering capacity for the system. The design of the pressure rod passing through the limiting block realizes the continuity of motion transmission and ensures that the pressure of the upper pressure block can be effectively transmitted to the lower elastic buffering system.

[0008] Preferably, the bottom sleeve has a connecting cavity at its lower end, the connecting pipe is connected to the connecting cavity, and the lower end face of the bottom sleeve has a pressure reducing pipe. The opening of the connecting cavity provides an important fluid buffer and pressure balance function for the entire pressure reducing system. As a transition chamber between the connecting pipe and the pressure reducing pipe, it can effectively accommodate the water squeezed out from the connecting pipe, so as to realize the slow release and uniform distribution of pressure.

[0009] Preferably, a pressure block is slidably connected to the center position inside the pressure reducing tube, and a connecting block is provided on the lower end face of the pressure block. The diameter of the connecting block is smaller than the diameter of the pressure block. Through the differentiated design that the diameter of the connecting block is smaller than the diameter of the pressure block, an effective volume difference pressure reducing mechanism is created.

[0010] Preferably, a third compression spring is fitted on the outer surface of the connecting block. One end of the third compression spring is connected to the lower end face of the lower pressure block, and the other end is connected to the inner wall of the pressure reducing pipe. A first pressure reducing cavity is formed below the connecting block and inside the pressure reducing pipe. The formation of the first pressure reducing cavity provides a dedicated working space for the further compression and flow of water. Its synergistic effect with the connecting block realizes the orderly compression and directional flow of water.

[0011] Preferably, the pressure-reducing pipe has four sets of second pressure-reducing chambers, which are connected to the first pressure-reducing chamber. Each second pressure-reducing chamber has a push rod, and a top spring is connected to the upper end of the push rod. The other end of the top spring is fixedly connected to the side wall of the communicating pipe. The distributed arrangement of the four sets of second pressure-reducing chambers provides a multi-point parallel pressure dissipation function for the entire pressure-reducing system.

[0012] Preferably, the drain pipe is equipped with a limiting plate, the hexagonal column is slidably connected to the limiting plate, a push spring is sleeved on the outer surface of the hexagonal column, one end of the push spring is fixedly connected to the side wall of the sealing plate, and the other end is fixedly connected to the side wall of the limiting plate. The side wall of the sealing plate is provided with several sets of limiting posts, and the surface of the limiting plate is provided with several sets of drain holes adapted to the limiting posts. The internal structure of the limiting plate is configured as a drainage mechanism to provide position control and flow regulation functions, ensuring the orderly progress and accurate stopping of the drainage process. The sliding connection design between the hexagonal column and the limiting plate realizes the precise transmission and positioning of the sealing plate movement.

[0013] Preferably, the sealing disc has a sealing strip on its side wall, and the drain pipe has a sealing groove on its inner side wall that corresponds to the sealing strip. The sealing strip ensures that the drain channel is completely sealed under normal working conditions by tightly fitting with the sealing groove, thus preventing accidental leakage of fluid.

[0014] Preferably, the outer surface of the threaded sleeve is provided with a handwheel, which allows the operator to change the opening and closing state of the entire valve.

[0015] (III) Beneficial Effects Compared with existing technologies, this invention provides an anti-drip valve with the following advantages: This anti-drip valve effectively eliminates water flow pressure fluctuations when the valve is closed by using a pressure-reducing mechanism and a drainage mechanism in a coordinated working mode. Firstly, in terms of pressure fluctuation absorption, the pressure-reducing mechanism of this valve adopts a multi-stage buffer design. Through the coordinated movement of components such as the pressure block, sliding sleeve, and pressure rod, combined with the graded elastic buffering effect of the first, second, and third pressure springs, it can effectively absorb and dissipate pressure fluctuations generated in the inlet pipe. When facing small pressure fluctuations, the second pressure spring can work independently to achieve primary pressure reduction, keeping the water volume in the connecting pipe constant and avoiding excessive system response. When encountering larger pressure fluctuations, the first and second pressure springs work simultaneously to form double buffer protection, further enhancing the pressure reduction capability. For further enhanced pressure impacts, the multi-stage volume buffer system, including the connecting cavity, pressure-reducing pipe, and pressure-reducing chamber, is fully activated. Through a clever volume difference design, deep pressure reduction is achieved, ensuring that pressure fluctuations of different amplitudes can be effectively controlled. In terms of flow regulation and system stability, the three parallel configurations of the drainage mechanism realize flow distribution and pressure balance functions. When the pressure in the system exceeds the set threshold, the drainage mechanism starts automatically, and the sealing disc moves backward synchronously under the thrust of the water flow, providing a diversion channel for part of the water flow in the inlet pipe to the outlet pipe, effectively reducing the pressure concentration upstream of the valve. The ingenious design of the limit column and the drainage hole ensures precise control of the drainage process. When the pressure drops to a safe range, the elastic restoring force of the push spring automatically drives the sealing disc to reset and restore the sealing state. The entire process can achieve pressure regulation and flow control without manual intervention. In addition, the valve exhibits good environmental adaptability and wide application compatibility. Since its working principle is based on pure mechanical transmission and fluid mechanics, it does not rely on external power sources or complex control systems. Therefore, it can work stably under various working conditions, including harsh environments such as high temperature and high pressure, corrosive media, vibration and shock. This design concept enables the anti-drip valve to be widely used in pipeline systems in many fields such as petrochemical, power energy, municipal water supply and drainage, and industrial production. It has strong engineering practical value and application prospects. Through the combined effect of the above-mentioned multiple technological advantages, this anti-drip valve effectively solves the problem of valve leakage caused by pressure fluctuations in existing technologies, improves valve sealing performance and extends service life, and provides strong technical support for the reliable operation of pipeline fluid control systems. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of an anti-drip valve according to the present invention; Figure 2 In this invention Figure 1 A schematic diagram of the cross-sectional structure; Figure 3 This is a cross-sectional view of the drain pipe and sealing disc in this invention. Figure 4 This is a cross-sectional view of the drainage mechanism in this invention. Figure 5 This is a cross-sectional view of the pressure-reducing mechanism in this invention; Figure 6 This is a cross-sectional view of the connecting pipe and the pressure block in this invention; Figure 7 This is a cross-sectional view of the pressure reducing tube and the lower pressure block in this invention; Figure 8 This is a cross-sectional view of the inlet and outlet pipes in this invention.

[0017] In the diagram: 11. Top sleeve; 12. Threaded sleeve; 13. Valve stem; 14. Valve disc; 15. Bottom sleeve; 16. Inlet pipe; 17. Outlet pipe; 18. Handwheel; 21. Connecting pipe; 22. Inlet groove; 23. Pressure block; 24. Pressure rod; 25. Sliding sleeve; 26. First compression spring; 27. Limiting block; 28. Second compression spring; 29. ​​Connecting cavity; 31. Drain pipe; 32. Sealing disc; 33. Connecting groove; 34. Hexagonal post; 35. Limiting disc; 36. Push spring; 37. Limiting post; 38. Drain hole; 39. Sealing strip; 210. Pressure reducing pipe; 211. Lower pressure block; 212. Connecting block; 213. Third compression spring; 214. First pressure reducing cavity; 215. Second pressure reducing cavity; 216. Top rod; 217. Top spring; 310. Sealing groove. Detailed Implementation

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0020] In this invention, unless otherwise stated, the directional terms such as "up" and "down" generally refer to the directions shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" generally refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0021] Please see Figures 1 to 8A drip-proof valve includes a top sleeve 11, a threaded sleeve 12 on the inner wall of the upper end of the top sleeve 11, a valve stem 13 internally threadedly connected to the threaded sleeve 12, the valve stem 13 slidably connected to the top sleeve 11, a valve disc 14 connected to the lower end face of the valve stem 13, a bottom sleeve 15 on the lower end face of the top sleeve 11, an inlet pipe 16 connected to one end of the bottom sleeve 15, and an outlet pipe 17 connected to the other end, and a handwheel 18 on the outer surface of the threaded sleeve 12; it also includes a pressure-reducing mechanism, which includes a connecting pipe 21, and a three-part... The connecting pipe 21 has three sets of inlet grooves 22 corresponding to the connecting pipe 21 on its inner wall. A pressure block 23 is located inside the connecting pipe 21. A pressure rod 24 is located on the lower end face of the pressure block 23. A sliding sleeve 25 is slidably connected to the surface of the pressure rod 24 and slides against the inner wall of the connecting pipe 21. A first compression spring 26 is sleeved on the outer surface of the pressure rod 24. One end of the first compression spring 26 is fixedly connected to the lower end face of the pressure block 23, and the other end is fixedly connected to the upper end face of the sliding sleeve 25. A limiting block 27 is located in the middle of the connecting pipe 21. Below sleeve 25, the lower end of pressure rod 24 passes through limiting block 27 and is connected to second compression spring 28. The other end of second compression spring 28 is fixedly connected to the bottom of communicating pipe 21. A communicating cavity 29 is opened at the lower end of bottom sleeve 15, and communicating pipe 21 communicates with communicating cavity 29. Pressure reducing pipe 210 is provided on the lower end face of bottom sleeve 15. Lower pressure block 211 is slidably connected to the center position of pressure reducing pipe 210. Connecting block 212 is provided on the lower end face of lower pressure block 211. The diameter of connecting block 212 is smaller than the diameter of lower pressure block 211. A sleeve is provided on the outer surface of connecting block 212. The third compression spring 213 has one end connected to the lower end face of the lower pressure block 211 and the other end connected to the inner wall of the pressure reducing tube 210. The lower part of the connecting block 212 forms a first pressure reducing cavity 214 with the inside of the pressure reducing tube 210. Four sets of second pressure reducing cavities 215 are opened in the pressure reducing tube 210. The four sets of second pressure reducing cavities 215 are connected to the first pressure reducing cavity 214. A top rod 216 is provided in the second pressure reducing cavity 215. A top spring 217 is connected to the upper end face of the top rod 216. The other end of the top spring 217 is fixedly connected to the side wall of the cavity of the connecting tube 21. It also includes a drainage mechanism, which includes a drain pipe 31. The drain pipe 31 is provided in three sets and is located inside the valve disc 14. The side wall of the drain pipe 31 is provided with a sealing disc 32. The side wall of the drain pipe 31 is provided with a connecting groove 33 that is adapted to the sealing disc 32. The other side of the sealing disc 32 is provided with a hexagonal post 34. The drain pipe 31 is provided with a limiting disc 35. The hexagonal post 34 is slidably connected to the limiting disc 35. The outer surface of the hexagonal post 34 is fitted with a push spring 36. One end of the push spring 36 is fixedly connected to the side wall of the sealing disc 32, and the other end is fixedly connected to the side wall of the limiting disc 35. The side wall of the sealing disc 32 is provided with several sets of limiting posts 37. The surface of the limiting disc 35 is provided with several sets of drain holes 38 that are adapted to the limiting posts 37. The side wall of the sealing disc 32 is provided with a sealing strip 39. The inner side wall of the drain pipe 31 is provided with a sealing groove 310 that corresponds to the sealing strip 39.

[0022] When engineers need to close the anti-drip valve, they first initiate the closing process by manually rotating the handwheel 18. The rotation of the handwheel 18 rotates the threaded sleeve 12, which in turn drives the threaded valve stem 13 to move downwards. The downward movement of the valve stem 13 causes the valve disc 14 to move downwards until the valve disc 14 is fully engaged with the valve seat, completely blocking the fluid flow from the inlet pipe 16 to the outlet pipe 17, thus completing the valve closing operation. After the valve is closed, the water flow in the inlet pipe 16 will still experience continuous pressure fluctuations due to various factors. To address these pressure fluctuations, the pressure-reducing mechanism and the drainage mechanism activate a collaborative working mode to jointly absorb the pressure. The important functions of dispersion and flow regulation are as follows: First, the connecting cavity 29 is filled with water, and the lower end face of the pressure block 23 and the upper end face of the sliding sleeve 25 in the area of ​​the connecting pipe 21 are also filled with water. When the pressure fluctuation of the water flow is small, the fluctuation pressure is directly transmitted to the pressure block 23 in the connecting pipe 21 through the water inlet groove 22 opened in the inner wall of the water inlet pipe 16. This causes the pressure block 23 to start moving downward under the drive of the pressure difference. The downward movement of the pressure block 23 drives the pressure rod 24 to move downward, which in turn drives the sliding sleeve 25 to move downward synchronously. At this time, the second compression spring 28 is compressed. Through the elastic potential energy storage mechanism of the spring, the energy of the pressure fluctuation is absorbed and buffered, producing a primary pressure reduction effect. At this time, the volume of water in the connecting pipe 21 remains unchanged. When the pressure fluctuation is large... When the amplitude exceeds the bearing capacity of the second compression spring 28 and cannot completely eliminate all pressure disturbances, the pressure block 23 continues to move downward under greater pressure. The sliding sleeve 25 moves downward synchronously and abuts against the upper surface of the limiting block 27. At this point, the first compression spring 26 begins to be compressed, and the second compression spring 28 continues to be compressed. As the sliding sleeve 25 moves further downward, the water in the connecting pipe 21 is squeezed into the connecting cavity 29. Because the volume of water cannot be compressed, the pressure generated by the sudden increase in the volume of water in the connecting cavity 29 continues to squeeze the lower pressure block 211, causing it to move downward. This, in turn, drives the connecting block 212 to move downward synchronously. The third compression spring 213 is compressed, and the first pressure-reducing cavity 214 and the four sets of second pressure-reducing cavities 215 are all filled with water. The downward movement of block 212 forces the water in the first pressure-reducing chamber 214 into the four connected sets of second pressure-reducing chambers 215. After the water flows into the second pressure-reducing chamber 215, it exerts an upward thrust on the push rod 216 inside the chamber, causing the push rod 216 to move upward and compress the top spring 217 at its upper end. The circular cross-sectional area of ​​the end face of the connecting block 212 is equal to the sum of the circular cross-sectional areas of the lower end faces of the four sets of push rods 216. The circular cross-sectional area of ​​the end face of the pressing block 211 is larger than the circular cross-sectional area of ​​the end face of the connecting block 212. When the pressing block 211 moves down the same distance as the connecting block 212, the volume space reserved by the downward movement of the pressing block 211 is larger than the volume of water squeezed into the second pressure-reducing chamber 215 from the first pressure-reducing chamber 214, thereby achieving a further pressure reduction effect.

[0023] While the pressure-reducing mechanism reduces pressure, the drainage mechanism also functions. The drainage mechanism consists of three sets. The water flow impacts the valve disc 14, squeezing the sealing disc 32 backward. The sealing disc 32 drives the hexagonal column 34 to move backward, and the hexagonal column 34 continues to push the next set of sealing discs 32 backward, and so on, so that the three sets of sealing discs 32 move backward synchronously. The push spring 36 is compressed. As the sealing disc 32 moves backward, the sealing strip 39 on its surface disengages from the sealing groove 310 of the drain pipe 31. The water flow can enter the drain pipe 31 through the connecting groove 33, and then continue to flow backward through the drain hole 38 on the surface of the limiting disc 35, so that the water flow from the inlet pipe 16 enters the outlet pipe 17 through the drainage mechanism. The sealing disc 32 moves backward until the flow-limiting column connected to its surface blocks the drain hole 38, stopping the drainage. The push spring 36 rebounds and drives the sealing disc 32 to move in the opposite direction until the sealing disc 32 seals against the drain pipe 31 again. The cooperation of the pressure-reducing mechanism and the drainage mechanism reduces the pressure fluctuation of the water flow, preventing the valve from being damaged and leaking due to continuous water flow impact.

[0024] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A drip-proof valve, comprising a top sleeve (11), characterized in that: The upper inner wall of the top sleeve (11) is provided with a threaded sleeve (12), and a valve stem (13) is internally threaded to the threaded sleeve (12). The valve stem (13) is slidably connected to the top sleeve (11). A valve disc (14) is connected to the lower end face of the valve stem (13). A bottom sleeve (15) is provided on the lower end face of the top sleeve (11). One end of the bottom sleeve (15) is connected to an inlet pipe (16), and the other end is connected to an outlet pipe (17). It also includes a pressure reducing mechanism, which includes a connecting pipe (21). The surface of the inlet pipe (16) is provided with three sets of connecting pipes (21). 6) The inner wall is provided with three sets of water inlet grooves (22) corresponding to the connecting pipe (21). The connecting pipe (21) is provided with a pressure block (23). The lower end face of the pressure block (23) is provided with a pressure rod (24). It also includes a drainage mechanism, which includes a drainage pipe (31). The drainage pipe (31) is provided with three sets. The drainage pipe (31) is located in the valve disc (14). The side wall of the drainage pipe (31) is provided with a sealing plate (32). The side wall of the drainage pipe (31) is provided with a connecting groove (33) that is adapted to the sealing plate (32). The other side of the sealing plate (32) is provided with a hexagonal column (34).

2. The anti-drip valve according to claim 1, characterized in that: The pressure rod (24) is slidably connected to a sliding sleeve (25), which is slidably connected to the inner wall of the connecting pipe (21). A first compression spring (26) is sleeved on the outer surface of the pressure rod (24). One end of the first compression spring (26) is fixedly connected to the lower end face of the pressure block (23), and the other end is fixedly connected to the upper end face of the sliding sleeve (25).

3. The anti-drip valve according to claim 2, characterized in that: A limiting block (27) is provided in the middle of the connecting pipe (21), located below the sliding sleeve (25). The lower end of the pressure rod (24) passes through the limiting block (27) and is connected to a second pressure spring (28). The other end of the second pressure spring (28) is fixedly connected to the bottom of the connecting pipe (21).

4. The anti-drip valve according to claim 3, characterized in that: The bottom sleeve (15) has a connecting cavity (29) at its lower end, and the connecting pipe (21) is connected to the connecting cavity (29). The bottom sleeve (15) has a pressure reducing pipe (210) on its lower end face.

5. A drip-proof valve according to claim 4, characterized in that: A pressure block (211) is slidably connected to the center of the pressure reducing pipe (210). A connecting block (212) is provided on the lower end face of the pressure block (211). The diameter of the connecting block (212) is smaller than the diameter of the pressure block (211).

6. The anti-drip valve according to claim 5, characterized in that: The outer surface of the connecting block (212) is fitted with a third compression spring (213). One end of the third compression spring (213) is connected to the lower end face of the lower pressure block (211), and the other end is connected to the inner wall of the pressure reducing tube (210). The lower part of the connecting block (212) and the inside of the pressure reducing tube (210) form a first pressure reducing cavity (214).

7. A drip-proof valve according to claim 6, characterized in that: The pressure reducing pipe (210) has four sets of second pressure reducing chambers (215) inside. The four sets of second pressure reducing chambers (215) are connected to the first pressure reducing chamber (214). The second pressure reducing chamber (215) is provided with a push rod (216). The upper end of the push rod (216) is connected to a top spring (217). The other end of the top spring (217) is fixedly connected to the side wall of the connecting pipe (21).

8. The anti-drip valve according to claim 1, characterized in that: The drain pipe (31) is provided with a limiting plate (35). The hexagonal column (34) is slidably connected to the limiting plate (35). A push spring (36) is sleeved on the outer surface of the hexagonal column (34). One end of the push spring (36) is fixedly connected to the side wall of the sealing plate (32), and the other end is fixedly connected to the side wall of the limiting plate (35). The side wall of the sealing plate (32) is provided with several sets of limiting columns (37). Several sets of drain holes (38) adapted to the limiting columns (37) are opened on the surface of the limiting plate (35).

9. A drip-proof valve according to claim 8, characterized in that: The sealing disc (32) has a sealing strip (39) on its side wall, and the drain pipe (31) has a sealing groove (310) on its inner side wall that corresponds to the sealing strip (39).

10. A drip-proof valve according to claim 1, characterized in that: The outer surface of the threaded sleeve (12) is provided with a handwheel (18).

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