Exhaust valve for a water supply and drainage system

Abstract

The application discloses an exhaust valve for a water supply and drainage system, relates to the technical field of exhaust valves, and comprises a valve cylinder and a valve cover, the valve cylinder is used for fixed connection with a water supply and drainage pipeline, and the valve cover is threadedly connected with the valve cylinder; an exhaust passage penetrating through the valve cover is formed in the valve cover, the exhaust passage is communicated with an inner cavity of the valve cylinder, and the exhaust passage is provided with a sealing member close to a port of the valve cylinder; a main guide rod is fixedly arranged in the valve cylinder, a main floating ball is slidably arranged on the main guide rod, and the main floating ball can slide to sealingly abut against the sealing member. The application has the effect of improving the maintenance efficiency of the exhaust valve.

Description

Technical Field

[0001] This application relates to the technical field of air release valves, and in particular to an air release valve for water supply and drainage systems. Background Technology

[0002] During operation, water flowing through pipes in a water supply and drainage system generates gases such as air and water vapor. These gases can accumulate inside the pipes, obstructing water flow and even causing pipe ruptures. Therefore, it is necessary to vent the water supply and drainage system to prevent gas buildup from affecting the normal operation of the pipes.

[0003] At bends in water supply and drainage pipes, trapped gas not only reduces flow but also accelerates internal aging and corrosion, shortening the pipe's lifespan. Air vents are typically installed at these bends to promptly remove trapped gas, thereby improving flow rate and safety while reducing maintenance costs.

[0004] After the exhaust valve has been used for a long time and is damaged, the staff will disassemble the exhaust valve, inspect it, determine the cause of the damage, and repair or replace the damaged parts.

[0005] However, during maintenance, the exhaust valve needs to be removed from the drain pipe and its structure needs to be disassembled, which is time-consuming and labor-intensive, resulting in low maintenance efficiency. Summary of the Invention

[0006] To address the issue of low maintenance efficiency of air vent valves, this application provides an air vent valve for water supply and drainage systems.

[0007] This application provides an air vent valve for a water supply and drainage system, employing the following technical solution:

[0008] An air vent valve for a water supply and drainage system includes a valve cylinder and a valve cover, wherein the valve cylinder is fixedly connected to a water supply and drainage pipe, and the valve cover is threadedly connected to the valve cylinder.

[0009] The valve cover has an exhaust channel that penetrates the valve cover and is connected to the inner cavity of the valve cylinder. A sealing component is provided at the port of the exhaust channel near the valve cylinder.

[0010] A main guide rod is fixed inside the valve cylinder, and a main float ball is slidably mounted on the main guide rod. The main float ball can slide to seal against the sealing component.

[0011] By adopting the above technical solution, the exhaust valve of this application is fixed on the water supply and drainage pipeline. When there is no gas in the water supply and drainage pipeline, the water in the water supply and drainage pipeline applies pressure to the main float, so that the main float is sealed to the sealing component. When there is gas in the water supply and drainage pipeline, the float leaves the sealing component with the liquid surface. At this time, the exhaust channel is opened, and the gas in the water supply and drainage pipeline can be discharged from the exhaust channel.

[0012] The main float of the exhaust valve is placed inside the valve cylinder, and the sealing component is placed inside the valve cover. When the exhaust valve is damaged, the operator only needs to remove the valve cover from the valve cylinder to quickly replace the main float on the main rod and the sealing component inside the valve cover.

[0013] Optionally, the sealing component includes a mounting cylinder fixed to the periphery of the exhaust channel and a sealing gasket detachably disposed on the mounting cylinder, the sealing gasket being interference-fitted with the mounting cylinder.

[0014] By adopting the above technical solution, the mounting cylinder can provide stable support for the sealing gasket, and the sealing gasket can be detachably installed on the mounting cylinder. When the sealing gasket is worn due to long-term use, causing the exhaust valve to malfunction, the staff can replace the sealing gasket to restore normal operation of the exhaust valve. The interference fit between the mounting cylinder and the sealing gasket makes it difficult for water to leak between the sealing gasket and the mounting cylinder.

[0015] Optionally, multiple ribs are fixed on the side wall of the mounting cylinder away from the valve cover, and multiple grooves are opened on the side wall of the sealing gasket. The multiple ribs are inserted into the grooves one by one, and the sealing gasket is made of rubber material.

[0016] By adopting the above technical solution, when the sealing gasket needs to be replaced, the staff only needs to remove the sealing gasket from the mounting cylinder. When installing the new sealing gasket, the staff only needs to snap the rib into the groove of the sealing gasket to complete the quick installation of the sealing gasket. The replacement is simple and quick. Moreover, the sealing gasket is made of rubber material, which makes the sealing effect between the sealing gasket, the main float, and the mounting cylinder better.

[0017] Optionally, a sealing block is also fixed to the inner wall of the exhaust channel, and a conical perforation is provided through the sealing block;

[0018] The main float is fixed with a secondary guide rod on the side away from the main guide rod, and a secondary float is fixed at the end of the secondary guide rod away from the main float. The secondary float can be moved to seal against the side wall of the conical perforation.

[0019] By adopting the above technical solution, a sealing block and an auxiliary float are installed in the exhaust channel, achieving double sealing of the exhaust valve. When there is a gap between the main float and the sealing component, the sealing contact between the auxiliary float and the sealing block can play a secondary sealing role for the water flow in the water supply and drainage pipe, making the drainage valve more leak-proof. In addition, the auxiliary guide rod is fixedly connected to the main float, and the auxiliary guide rod and auxiliary float can be easily and quickly replaced when the valve cover is removed from the valve cylinder.

[0020] Optionally, a shut-off valve is fixedly installed between the valve cylinder and the water supply and drainage pipe. The shut-off valve includes a rotating plate, and a connecting rod is fixed between the rotating plate and the valve cover. The shut-off valve also includes a channel that can be opened and closed by rotating the rotating plate.

[0021] By adopting the above technical solution, in order to reduce the occurrence of water overflowing from the drain valve in the water supply and drainage pipes during the maintenance and replacement process, a shut-off valve is installed between the water supply and drainage pipes and the valve cylinder, so that the workers can block the water supply and drainage pipes through the shut-off valve while removing the valve cover.

[0022] Optionally, the shut-off valve includes a first fixing plate and a second fixing plate disposed on both sides of the rotating plate. The side of the first fixing plate away from the rotating plate is fixedly connected to the valve cylinder, and the side of the second fixing plate away from the rotating plate is detachably connected to the water supply and drainage pipe.

[0023] The channel includes a first through hole and a second through hole respectively penetrating through the first fixed plate and the second fixed plate, and a plurality of connecting holes penetrating through the rotating plate, wherein the first through hole and the second through hole are coaxially formed.

[0024] By adopting the above technical solution, when the drain valve is working normally, the first through hole on the first fixed plate, the second through hole on the second fixed plate, and the connecting hole on the rotating plate are connected, allowing water and gas in the water supply and drainage pipe to enter the valve cylinder. When the staff needs to remove the valve cover for maintenance, the valve cover is rotated, and the connecting rod drives the rotating plate to rotate. When the valve cover is removed, the rotating plate rotates until the connecting hole is misaligned with the first through hole and the second through hole. At this time, water in the water supply and drainage pipe is difficult to enter the valve cylinder through the shut-off valve, thus making it easier for the staff to maintain the drain valve.

[0025] Optionally, the connecting rod includes a first connecting rod and a second connecting rod. One end of the first connecting rod is fixedly connected to the valve cover, and the other end is detachably connected to the second connecting rod. The end of the second connecting rod away from the first connecting rod is fixedly connected to the side wall of the rotating plate.

[0026] The second connecting rod has a polygonal snap-fit ​​groove on one end face near the first connecting rod. The first connecting rod is inserted into the snap-fit ​​groove, and the cross-section of the first connecting rod matches the shape of the snap-fit ​​groove.

[0027] By adopting the above technical solution, when the operator disassembles the valve cover, rotating the valve cover causes the first connecting rod end to be inserted into the snap-fit ​​groove, which has a polygonal structure, and the rotating plate rotates together with the valve cover. When the valve cover is removed from the valve cylinder, the first connecting rod and the second connecting rod automatically disengage, allowing the valve cover to be easily removed. When reinstalling the valve cover, simply align the first connecting rod with the snap-fit ​​groove and rotate the valve cover to install the valve cover and open the shut-off valve. The operation is simple and convenient.

[0028] Optionally, the valve cover may be detachably equipped with a protective shell at the end away from the valve cylinder, and the protective shell has several vent holes on its side wall away from the valve cylinder.

[0029] By adopting the above technical solution, the protective shell can protect the exhaust channel, reduce the possibility of external pollutants entering the valve cylinder from the exhaust channel, and open the vent holes on the protective shell so that the gas in the water supply and drainage pipes can be discharged smoothly.

[0030] Optionally, a dust cover is provided at the end of the exhaust passage away from the valve cylinder, the dust cover covers the exhaust passage, and the side wall of the dust cover is provided with a plurality of exhaust grooves.

[0031] By adopting the above technical solution, if only a protective shell is set, external pollutants can easily enter the exhaust channel through the vent. Setting a dust cover can provide secondary protection for the exhaust channel. Moreover, the exhaust groove is opened on the side wall of the dust cover, so that the vent and the dust cover are not on a parallel plane, which can further prevent external pollutants from entering the exhaust channel.

[0032] In summary, this application includes at least one of the following beneficial effects:

[0033] 1. When the drain valve of this application is inspected or replaced, the valve cover can be quickly separated from the valve cylinder simply by rotating the valve cover. Moreover, the internal structure of the drain valve of this application is simple, which enables quick replacement and maintenance.

[0034] 2. Install a shut-off valve so that when the operator removes the valve cover, the shut-off valve can be simultaneously activated to close the water supply and drainage pipes, reducing the impact of water in the water supply and drainage pipes on the operator's maintenance of the drain valve;

[0035] 3. The auxiliary float and auxiliary guide rod are set up to achieve dual anti-clogging of the drain valve. Even if the main float becomes less effective or fails due to long-term use, the auxiliary float can still play a sealing role, reducing the possibility of leakage after long-term use of the drain valve. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0037] Figure 2 This is a partial cross-sectional view used in this application embodiment to illustrate the internal structure;

[0038] Figure 3 This is an exploded structural diagram of the sealing assembly according to an embodiment of this application;

[0039] Figure 4 This is an exploded structural diagram of the shut-off valve according to an embodiment of this application.

[0040] Explanation of reference numerals in the attached drawings: 1. Valve cylinder; 11. Main guide rod; 2. Valve cover; 21. Exhaust passage; 22. Sealing block; 221. Conical perforation; 23. Protective shell; 231. Vent hole; 24. Dust cover; 241. Exhaust groove; 3. Sealing component; 31. Mounting cylinder; 311. Rib; 32. Sealing gasket; 321. Rib groove; 4. Main float; 41. Secondary guide rod; 42. Secondary float; 5. Shut-off valve; 51. First fixing plate; 511. First through hole; 52. Second fixing plate; 521. Second through hole; 53. Rotating plate; 531. Connecting hole; 6. Connecting rod; 61. First connecting rod; 62. Second connecting rod; 621. Snap-fit ​​groove; 7. Limiting rod; 71. Enlargement block. Detailed Implementation

[0041] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0042] This application discloses an air vent valve for a water supply and drainage system, as shown in the embodiments below. Figure 1 An air vent valve for a water supply and drainage system includes a valve cover 2 and a valve cylinder 1. The valve cylinder 1 is a hollow component, and the valve cover 2 is threadedly connected to one end of the valve cylinder 1. A shut-off valve 5 is fixed to the end of the valve cylinder 1 away from the valve cover 2. The end of the shut-off valve 5 away from the valve cylinder 1 is threadedly connected to a water supply and drainage pipe, which is not shown in the figure.

[0043] Reference Figure 2 and Figure 3An exhaust channel 21 is provided through the valve cover 2. When the valve cover 2 is threaded to the valve cylinder 1, the exhaust channel 21 communicates with the inner cavity of the valve cylinder 1. A sealing member 3 is provided at one end of the exhaust channel 21 near the valve cylinder 1. The sealing member 3 includes a mounting cylinder 31 fixed around the exhaust channel 21. The mounting cylinder 31 is frustoconical, and the exhaust channel 21 communicates with the hollow area of ​​the mounting cylinder 31. Multiple ribs 311 are radially fixed on the inner wall of the mounting cylinder 31. A sealing gasket 32 ​​is detachably provided on the ribs 311. The sealing gasket 32 ​​is a hollow frustoconical shape that matches the shape and size of the inner wall of the mounting cylinder 31. The sealing gasket 32 ​​is made of rubber material, and multiple grooves 321 are formed on the side wall of the sealing gasket 32 ​​near the mounting cylinder 31. The ribs 311 can be inserted into the grooves 321 one by one, and the ribs 311 and the sealing gasket 32 ​​are interference fit. Because the sealing gasket 32 ​​is made of rubber, there is a large friction between the sealing gasket 32 ​​and the rib 311; the sealing gasket 32 ​​and the rib 311 are interference fit, which allows the sealing gasket 32 ​​to be tightly fixed on the inner wall of the mounting cylinder 31.

[0044] Reference Figure 2 and Figure 3 A main guide rod 11 is fixed inside the valve cylinder 1. The main guide rod 11 is arranged parallel to the side wall of the valve cylinder 1, and a main float 4 is slidably mounted on the main guide rod 11. Specifically, the main float 4 has an elongated hole with one end penetrating the main float 4 and the other end not penetrating the main float 4. The elongated hole passes through the center of the main float 4, and the main guide rod 11 is inserted into the elongated hole. The main float 4 can slide along the main guide rod 11 until it is tightly sealed against the side wall of the sealing gasket 32. When the main float 4 is tightly sealed against the sealing gasket 32, the main float 4 does not detach from the main guide rod 11.

[0045] Reference Figure 2 and Figure 4 The shut-off valve 5 includes a first fixed plate 51, a rotating plate 53, and a second fixed plate 52 arranged sequentially. The first fixed plate 51 is fixedly connected to the valve cylinder 1, and the end of the second fixed plate 52 away from the rotating plate 53 is threadedly connected to the water supply and drainage pipe. The rotating plate 53 is rotatably connected to both the first fixed plate 51 and the second fixed plate 52, and the side walls of the rotating plate 53 are in contact with the side walls of the first fixed plate 51 and the second fixed plate 52. Specifically, a limiting rod 7 passes through the first fixed plate 51, the second fixed plate 52, and the rotating plate 53. Both ends of the limiting rod 7 are fixed with enlarged blocks 71, which abut against the side walls of the first fixed plate 51 and the second fixed plate 52 away from the rotating plate 53, respectively. The limiting rod 7 can be rotatably connected relative to the first fixed plate 51 and the second fixed plate 52, and the limiting rod 7 is fixedly connected to the rotating plate 53.

[0046] Reference Figure 2 and Figure 4The shut-off valve 5 also includes a channel for connecting the valve cylinder 1 and the water supply and drainage pipes. The channel includes a first through hole 511 through the first fixed plate 51, a second through hole 521 through the second fixed plate 52, and one or more connecting holes 531 through the rotating plate 53. The first through hole 511 and the second through hole 521 are coaxially arranged. When the rotating plate 53 is rotated so that the connecting hole 531 is connected to the first through hole 511 and the second through hole 521, the shut-off valve 5 opens. When the rotating plate 53 is rotated so that the connecting hole 531 is misaligned with the first through hole 511 or the second through hole 521, the shut-off valve 5 closes.

[0047] Reference Figure 1 and Figure 4 A connecting rod 6 is also provided between the valve cover 2 and the shut-off valve 5. The connecting rod 6 includes a first connecting rod 61 and a second connecting rod 62. One end of the first connecting rod 61 is fixedly connected to the side wall of the valve cover 2, and the other end is detachably connected to the second connecting rod 62. The end of the second connecting rod 62 away from the first connecting rod 61 is fixedly connected to the side wall of the rotating plate 53. The cross-sectional area of ​​the second connecting rod 62 is larger than that of the first connecting rod 61, and a polygonal snap-fit ​​groove 621 is provided on the end face of the second connecting rod 62 near the first connecting rod 61. The end of the first connecting rod 61 away from the valve cover 2 is inserted into the snap-fit ​​groove 621, and the cross-sectional shape of the first connecting rod 61 matches the shape of the snap-fit ​​groove 621. When the valve cover 2 rotates, the connecting rod 6 can drive the rotating plate 53 to rotate synchronously. At the same time, since the first connecting rod 61 is only inserted into the snap-fit ​​groove 621, when the threaded connection between the valve cover 2 and the valve cylinder 1 is released, the first connecting rod 61 and the second connecting rod 62 also separate from each other.

[0048] Reference Figure 2 and Figure 4 By appropriately setting the number of threads in the threaded connection between the valve cover 2 and the valve cylinder 1, and the position of the connecting hole 531 on the rotating plate 53, it is possible to achieve the following: when the operator rotates to open the valve cover 2, the rotating plate 53 rotates via the connecting rod 6. When the valve cover 2 is removed from the valve cylinder 1, the connecting hole 531 on the rotating plate 53 is misaligned with either the first through hole 511 or the second through hole 521, thus closing the shut-off valve 5. Similarly, when the operator installs the valve cover 2 onto the valve cylinder 1, the shut-off valve 5 opens, and the drain valve operates normally. The shut-off valve 5 allows operators to more conveniently and quickly inspect the drain valve, reducing the impact of water in the water supply and drainage pipes on their inspections.

[0049] Reference Figure 2The inner wall of the exhaust channel 21 is also fixed with a sealing block 22, which blocks the exhaust channel 21. A conical perforation 221 is opened through the sealing block 22. A secondary guide rod 41 is fixedly installed at the end of the main float 4 away from the main guide rod 11. The length of the secondary guide rod 41 is parallel to the length of the main guide rod 11. A secondary float 42 is fixedly connected at the end of the secondary guide rod 41 away from the main float 4. The secondary float 42 can seal against the side wall of the conical perforation 221.

[0050] Reference Figure 2 A dust cover 24 is threaded onto the side wall of the valve cover 2 away from the valve cylinder 1. The dust cover 24 covers the exhaust channel 21, and multiple exhaust grooves 241 are spaced apart on the side wall of the dust cover 24. A protective shell 23 is provided outside the dust cover 24, which is also threaded onto the valve cover 2. Multiple vent holes 231 are provided on the side wall of the protective shell 2 away from the valve cover 2. The protective shell 23 and the dust cover 24 can reduce the entry of external contaminants into the valve cylinder 1 through the exhaust channel 21 without affecting the outward discharge of gas from the exhaust valve. At the same time, the opening plane of the exhaust grooves 241 is perpendicular to the opening plane of the vent holes 231, making it even more difficult for external contaminants to enter the valve cylinder 1. The threaded connection of the protective shell 23 or the dust cover 24 to the valve cover 2 allows the operator to quickly clean the inside of the protective shell 23 or the dust cover 24.

[0051] The implementation principle of an air vent valve for a water supply and drainage system according to an embodiment of this application is as follows: When there is no gas in the water supply and drainage pipe, water enters the drain valve. The float moves along the main guide rod 11 with the water in the air vent valve until the main float 4 seals against the side wall of the sealing gasket 32. At this time, the auxiliary guide rod 41 moves with the main float 4, causing the auxiliary float 42 to also move to abut against the conical perforation 221, thus sealing the drain valve and making it difficult for water in the water supply and drainage pipe to flow out of the drainage pipe. Even if there is wear between the main float 4 and the sealing gasket 32, causing the seal to fail, the auxiliary float 42 can still intercept the water in the drain valve, making it difficult for water in the water supply and drainage pipe to flow out of the drain valve. The combination of the main float 4 and the auxiliary float 42 extends the service life of the drain valve and provides double interception of water in the drain valve, reducing the possibility of water flowing out of the drain valve through the drainage channel.

[0052] When gas is present in the water supply and drainage pipes, it enters the drain valve, causing the liquid level inside the drain valve to drop. At this time, the main float 4 moves with the liquid level until it no longer abuts against the sealing gasket 32, and simultaneously the auxiliary float 42 moves with the main float 4 until it disengages from the conical perforation 221, allowing the gas to escape from the vent channel 21. After the gas is expelled, the liquid level in the drain valve returns to normal, and the main float 4 and auxiliary float 42 close the drain channel again.

[0053] When staff perform regular maintenance on the drain valve, or when the drain valve is damaged and requires repair, they only need to remove the valve cover 2 from the valve cylinder 1. As the valve cover 2 rotates, the rotating plate 53 rotates along with it under the transmission of the connecting rod 6. When the valve cover 2 is removed, the rotating plate 53 rotates to the closed position of the shut-off valve 5, which prevents water from the water supply and drainage pipes from entering the drain valve, facilitating maintenance. After the valve cover 2 is removed, due to the simple internal structure of the valve cylinder 1, workers can quickly replace the main float 4, sealing gasket 32, and auxiliary float 42, reducing maintenance difficulty and improving maintenance efficiency.

[0054] After the overhaul is completed, the valve cover 2 is reconnected to the valve cylinder 1 by thread. When the valve cover 2 is rotated, the connecting rod 6 drives the rotating plate 53 to rotate. After the valve cover 2 is installed, the shut-off valve 5 is in the open state, and the water in the water supply and drainage pipe can enter the drain valve, and the drain valve starts working again.

[0055] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An air vent valve for a water supply and drainage system, characterized in that: It includes a valve cylinder (1) and a valve cover (2), wherein the valve cylinder (1) is fixedly connected to the water supply and drainage pipe, and the valve cover (2) is threadedly connected to the valve cylinder (1); The valve cover (2) is provided with an exhaust channel (21) that penetrates the valve cover (2). The exhaust channel (21) is connected to the inner cavity of the valve cylinder (1). A sealing member (3) is provided at the port of the exhaust channel (21) near the valve cylinder (1). The valve cylinder (1) is fixed with a main guide rod (11), and a main float ball (4) is slidably arranged on the main guide rod (11). The main float ball (4) can slide to seal against the sealing member (3). A shut-off valve (5) is fixedly installed between the valve cylinder (1) and the water supply and drainage pipe. The shut-off valve (5) includes a rotating plate (53). A connecting rod (6) is fixed between the rotating plate (53) and the valve cover (2). The shut-off valve (5) also includes a channel that can be opened and closed by rotating the rotating plate (53). The connecting rod (6) includes a first connecting rod (61) and a second connecting rod (62). One end of the first connecting rod (61) is fixedly connected to the valve cover (2), and the other end is detachably connected to the second connecting rod (62). The end of the second connecting rod (62) away from the first connecting rod (61) is fixedly connected to the side wall of the rotating plate (53). The second connecting rod (62) has a polygonal snap-fit ​​groove (621) on one end face near the first connecting rod (61). The first connecting rod (61) is inserted into the snap-fit ​​groove (621), and the cross-section of the first connecting rod (61) matches the shape of the snap-fit ​​groove (621). The shut-off valve (5) includes a first fixing plate (51) and a second fixing plate (52) disposed on both sides of the rotating plate (53). The side of the first fixing plate (51) away from the rotating plate (53) is fixedly connected to the valve cylinder (1), and the side of the second fixing plate (52) away from the rotating plate (53) is detachably connected to the water supply and drainage pipe. The channel includes a first through hole (511) and a second through hole (521) respectively through the first fixed plate (51) and the second fixed plate (52), and a plurality of connecting holes (531) through the rotating plate (53), wherein the first through hole (511) and the second through hole (521) are coaxially formed. When the operator rotates to open the valve cover (2), the rotating plate (53) is driven to rotate through the connecting rod (6). When the valve cover (2) is removed from the valve cylinder (1), the connecting hole (531) on the rotating plate (53) is misaligned with the first through hole (511) or the second through hole (521), thus closing the shut-off valve (5). Similarly, when the operator installs the valve cover (2) onto the valve cylinder (1), the shut-off valve (5) opens, and the drain valve operates normally.

2. An air vent valve for a water supply and drainage system according to claim 1, characterized in that: The sealing component (3) includes a mounting cylinder (31) fixed around the exhaust channel (21) and a sealing gasket (32) detachably mounted on the mounting cylinder (31), the sealing gasket (32) being interference-fitted with the mounting cylinder (31).

3. An air vent valve for a water supply and drainage system according to claim 2, characterized in that: The mounting cylinder (31) has multiple ribs (311) fixed on the side wall away from the valve cover (2), and the sealing gasket (32) has multiple grooves (321) on its side wall. The multiple ribs (311) are inserted into the grooves (321) one by one, and the sealing gasket (32) is made of rubber material.

4. An air vent valve for a water supply and drainage system according to claim 1, characterized in that: The inner wall of the exhaust channel (21) is also fixed with a sealing block (22), and a conical perforation (221) is opened through the sealing block (22). The main float (4) is fixed with a secondary guide rod (41) on the side away from the main guide rod (11), and a secondary float (42) is fixed at the end of the secondary guide rod (41) away from the main float (4). The secondary float (42) can move to seal against the side wall of the conical perforation (221).

5. An air vent valve for a water supply and drainage system according to claim 1, characterized in that: The valve cover (2) is detachably equipped with a protective shell (23) at the end away from the valve cylinder (1). The protective shell (23) has several vent holes (231) on its side wall away from the valve cylinder (1).

6. An air vent valve for a water supply and drainage system according to claim 1, characterized in that: The exhaust channel (21) is provided with a dust cover (24) at the end away from the valve cylinder (1). The dust cover (24) covers the exhaust channel (21), and the side wall of the dust cover (24) is provided with a plurality of exhaust grooves (241).

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