Air valve

Abstract

To provide an air valve which enables efficient suctioning and exhausting of air.SOLUTION: An air valve 1 includes: a valve casing having a valve casing hollow part 2a therein and having a valve casing flange part 22 in a periphery near an upper opening of the valve casing hollow part 2a; a lid body 3 which has a lid body hollow part 3a therein, has a lid body flange part 32 which is fastened to the valve casing flange part 22 in a periphery near a lower opening 3aa of the lid body hollow part 3a, and has a lid body cap part 35 formed with a small air hole 35a and in which the lower opening 3aa of the lid body hollow part 3a communicates with the valve casing hollow part 2a, an upper opening of a large air hole 32b is formed on an upper surface of the lid body flange part 32, and a lower opening communicates with the valve casing hollow part 2a; a floating valve body 4 which is disposed in the valve casing hollow part 2a, may close the large air hole 32b from below, and is formed with a center hole 4a penetrating in a vertical direction; and a float valve body 5 which is disposed in the lid body hollow part 3a and may close the small air hole 35a from below.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to an air valve that is connected to a pipe through which water flows and that performs intake and exhaust. [Background technology]

[0002] Conventionally, air valves are connected to pipes such as water supply and sewerage, industrial water pipelines, and agricultural water pipelines, and are widely used in various places. Air valves having a large air hole and a small air hole are generally used (for example, Patent Documents 1 and 2, etc.). The large air hole is used for intake and large-volume exhaust (rapid exhaust). When the pipe is switched from a water-passing state to a water-cut state, such as when the upstream pump is stopped (or the upstream valve is closed), the intake air can be introduced into the pipe to rapidly drain the water in the pipe. When the pipe is switched from a water-cut state to a water-passing state, such as when the upstream pump is operated (or the upstream valve is opened), the large-volume exhaust can rapidly exhaust the air (including other gases) in the pipe to the outside. Also, the small air hole is used for small-volume exhaust. When the pipe is in a normal water-passing state under normal pressure, the small-volume exhaust can exhaust air that has entered the pipe for various reasons to the outside in small amounts.

[0003] Such an air valve generally includes a valve box connected to a pipe, a cover in which a large air hole is formed and which is attached to the valve box, a floating valve body arranged in the internal space of the valve box and the cover (the internal space formed by the valve box and the cover) and capable of blocking the large air hole of the cover depending on the position of the water surface (water level) in the internal space, and a float valve body arranged in the internal space of the valve box and the cover. The small air hole is formed in the cover (for example, Patent Document 1, etc.) or in the floating valve body (for example, Patent Document 2, etc.). The float valve body can block the small air hole depending on the water level. The float valve body and the floating valve body have a specific gravity smaller than that of water. A water stop valve (including a so-called repair valve, etc.) capable of stopping the intrusion of water into the valve box (stopping the water) for repairing the air valve, etc., can be provided between the air valve and the pipe.

[0004] In most cases, the large air hole and the small air hole are arranged in parallel in a nearly horizontal direction (e.g., Patent Document 1, etc.), or the large air hole is arranged at the top and the small air hole is arranged at the bottom (e.g., Patent Document 2, etc.), but there are also known valves in which the large air hole is arranged at the bottom and the small air hole is arranged at the top (e.g., Patent Documents 3 and 4, etc.). Patent Documents 3 and 4 disclose an air valve in which the large air hole is formed on the side of the lower part of the lid body (valve lid and cover (and the topmost lid in Patent Document 4)) and the small air hole is formed on the cap part of the lid body. In this air valve, an annular floating valve body (annular float with a cylindrical valve body erected on top) is arranged inside the valve body, and a float valve body (float) is arranged inside the lid body. An air valve in which the large air hole is arranged at the bottom and the small air hole is arranged at the top can widen the passage between the large air hole and the water passage port of the valve body, and it is possible to increase the amount of intake and large-volume exhaust per hour. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Utility Model Application Publication No. 4-126076 [Patent Document 2] JP 2009-121678 A [Patent Document 3] Japanese Utility Model Application Publication No. 55-93769 [Patent Document 4] Japanese Utility Model Application Publication No. 3-49477 Summary of the Invention [Problem to be solved by the invention]

[0006] However, there are cases where more efficient intake and exhaust is desired than the air valves disclosed in Patent Documents 1 and 2, as well as Patent Documents 3 and 4. For example, in cases where the piping is switched between a water-passing state and a water-cut state frequently (e.g., on a daily basis), such as in an agricultural water pipeline, more efficient intake and large-volume exhaust are desired.

[0007] The present invention has been made in consideration of the above circumstances, and has an object to provide an air valve capable of efficient intake and exhaust. [Means for solving the problem]

[0008] In order to achieve the above object, the air valve according to claim 1 is an air valve having a large air hole and a small air hole, comprising: a valve box having a valve box hollow portion therein and a valve box flange portion around the vicinity of an upper opening of the valve box hollow portion; a lid having a lid hollow portion therein and a lid flange portion fastened to the valve box flange portion of the valve box around the vicinity of a lower opening of the lid hollow portion; a lid cap portion in which the small air hole is formed, the lower opening of the lid hollow portion communicating with the valve box hollow portion of the valve box, the upper opening of the large air hole being formed on an upper surface of the lid flange portion and the lower opening communicating with the valve box hollow portion of the valve box; a floating valve element which is arranged in the valve box hollow portion of the valve box and which is formed with a central hole penetrating in the vertical direction, and a float valve element which is arranged in the lid hollow portion of the lid and which is able to block the large air hole from below. And, The cover is provided with a floating valve pin that can be inserted into the large air hole from above. Through elastic body It is retained.

[0009] Claim 2 The air valve according to claim 1 In the air valve described in the above, the cover body holds a float valve pin body that can be inserted into the small air hole from above.

[0010] Claim 3 The air valve according to claim 1 or 2 In the air valve described in the above, the lid has a guide rod extending downward from the lid cap portion, and the float valve body is formed with a guide rod insertion hole through which the guide rod passes.

[0011] Claim 4 The air valve described in An air valve having a large air hole and a small air hole, the air valve having a valve box hollow portion therein and a valve box flange portion around the vicinity of an upper opening of the valve box hollow portion, a lid hollow portion therein and a lid flange portion fastened to the valve box flange portion of the valve box around the vicinity of a lower opening of the lid hollow portion, and a lid cap portion in which the small air hole is formed, the lower opening of the lid hollow portion communicating with the valve box hollow portion of the valve box, and the upper opening of the large air hole is connected to the lid flange portion a lid body having a lower opening formed on an upper surface thereof and communicating with the valve box hollow portion of the valve box; a floating valve body arranged in the valve box hollow portion of the valve box and capable of blocking the large air hole from below and having a central hole passing through in the vertical direction; and a float valve body arranged in the lid body hollow portion of the lid body and capable of blocking the small air hole from below, the lid body having a guide rod body extending downward from the lid body cap portion, and a guide rod body insertion hole through which the guide rod body is inserted is formed in the float valve body, The float valve body has an upper member and a lower member, and the upper member and the lower member are joined so as to be able to tilt relative to each other. Effect of the Invention

[0012] The present invention Air valve This allows for efficient intake and exhaust. [Brief description of the drawings]

[0013] [Figure 1] FIG. 2 is a front view showing an air valve and a water stop valve according to an embodiment of the present invention. [Diagram 2] FIG. [Diagram 3] 3 is a cross-sectional view of the air valve shown in FIG. 2 (a cross-sectional view taken along the line AA in FIG. 2). [Figure 4] FIG. 2 is a plan view showing the valve body of the air valve and the floating valve body therein. [Diagram 5] FIG. 4 is a bottom view of the cover of the air valve. [Figure 6] 1A and 1B show the cover cap portion of the cover of the air valve and the members attached thereto, where (a) is a side view and (b) is a bottom view. [Figure 7] 1 shows the floating valve body of the air valve of the same, where (a) is a side view and (b) is a bottom view. [Figure 8] 1A, 1B, and 1C are diagrams showing the float valve body of the air valve of the same, in which FIG. [Figure 9] FIG. 2 is a cross-sectional view of the air valve shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the present invention will be described. The air valve 1 according to the embodiment of the present invention has a large air hole 32b and a small air hole 35a, which will be described later. As shown in Figures 1, 2, and 3, the air valve 1 includes a valve box 2, a cover 3, a floating valve element 4, and a float valve element 5.

[0015] The valve box 2 is connected to a pipe and has a valve box hollow section 2a inside. The wall section surrounding the valve box hollow section 2a is a cylindrical valve box tubular section 21. Below the valve box hollow section 2a is a water conveying section 2b with a smaller inner diameter. The valve box 2 can be made mainly of cast iron, for example. A floating valve element 4, which will be described in detail later, is disposed in the valve box hollow section 2a, as shown in Figures 3 and 4.

[0016] The upper side of the valve box hollow portion 2a is open, and a valve box flange portion 22 is provided around the vicinity of the upper opening. The valve box flange portion 22 has a plurality of valve box fastening holes 22a (four in this embodiment).

[0017] A separate water stop valve 10 (including a so-called repair valve, etc.) that controls the infiltration of water into the valve box hollow part 2a through the water conveying part 2b is usually connected between the valve box 2 and the piping (see Figure 1). The water stop valve 10 may not be a separate valve, but may be provided in the middle of the water conveying part 2b by extending it downward.

[0018] The cover 3 is attached to the upper side of the valve box 2, and has a cover hollow portion 3a inside. The wall portion around the cover hollow portion 3a is a cylindrical cover cylindrical portion 31. The cover cylindrical portion 31 can be composed of a lower cover cylindrical portion 311 and an upper cover cylindrical portion 312. The lower cover cylindrical portion 311 (and the cover flange portion 32 continuing therefrom, which will be described later) can be made mainly of cast iron, for example. The upper cover cylindrical portion 312 can be made of a material (for example, stainless steel, copper-based metal) that can easily improve machining accuracy (for example, machining accuracy of the inner wall, etc.). As shown in FIG. 3, a float valve body 5, which will be described later in detail, is arranged in the cover hollow portion 3a.

[0019] The lower side of the cover hollow portion 3a is open and communicates with the valve box hollow portion 2a of the valve box 2. The inner diameter of the lower opening 3aa is smaller than the inner diameter of the upper opening of the valve box hollow portion 2a.

[0020] The lid 3 has a lid flange 32 around the vicinity of the lower opening 3aa. A plurality of lid fastening holes 32a (four in this embodiment) are formed in the lid flange 32. The lid flange 32 is fastened to the valve box flange 22 by a plurality of fasteners 3A (four in this embodiment) consisting of bolts and nuts. In detail, the lid flange 32 is fastened to the valve box flange 22 by passing a bolt through the valve box fastening hole 22a and the lid fastening hole 32a of the valve box flange 22 and tightening the bolt and nut.

[0021] The cover flange 32 has a portion that overlaps with the upper opening of the valve box hollow portion 2a of the valve box 2 in a plan view, and an upper opening of the large air hole 32b is formed on the upper surface of the cover flange 32. The lower opening of the large air hole 32b is connected to the valve box hollow portion 2a of the valve box 2. The large air hole 32b is divided into a predetermined number (six in this embodiment) (see FIG. 5). The large air hole 32b may be a through hole formed in the up-down direction (vertical direction), or, as shown in FIG. 3, the upper opening of the large air hole 32b is shifted outward (outward with respect to the axis of the air valve 1) from the lower opening, and the large air hole 32b may be a through hole formed obliquely in the up-down direction so that it is generally outward as it goes upward.

[0022] The cover 3 has O-rings 33A and 33B on the outer and inner sides of the lower opening of the large air hole 32b on its underside (including the underside of the cover flange portion 32). The upper surface of the floating valve element 4 is in close contact with the underside of the cover 3 (specifically, the O-rings 33A and 33B) and can close the lower opening of the large air hole 32b.

[0023] It is possible to incorporate a separate plate 3' made of a material (e.g., a copper-based metal) that is different from the other main parts and can be easily machined with high precision on the inner side of the lid fastening hole 32a on the underside of the lid 3. In this way, it is possible to accurately flatten the underside of the lid 3 and accurately form the holes into which the O-rings 33A and 33B are fitted so that the floating valve body 4 can effectively close the large air hole 32b.

[0024] The cover 3 has a floating valve pin body 34 that is held via an elastic body 34A such as a spring body. The floating valve pin body 34 can be inserted into the large air hole 32b from above (including diagonally above), and can reach the valve box hollow portion 2a by pushing the upper part. In this embodiment, the elastic body 34A is held by an elastic body holding cylinder 34B.

[0025] The upper side of the lid hollow portion 3a of the lid 3 is closed by the lid cap portion 35. The above-mentioned small air hole 35a is formed in the lid cap portion 35. In this embodiment, the small air hole 35a is formed on the central axis of the lid 3. In detail, the lid cap portion 35 has a valve seat 35b, and the small air hole 35a is formed by vertically penetrating the valve seat 35b and the member above it. The valve seat 35b has elasticity, and when the float valve body 5 is in close contact with it from below, the small air hole 35a is blocked. In the example shown in FIG. 3, a recess 35c is formed below and around the valve seat 35b on the lower surface of the lid cap portion 35. In addition, an external air hole 38 is formed on the side surface of the lid cap portion 35, which is connected to the small air hole 35a through the space between them (see FIG. 1). The lid cap part 35 is removable from the lid tubular part 31 (specifically, the upper lid tubular part 312). When the lid cap part 35 is removed, the valve seat 35b can be cleaned, or the float valve body 5 arranged in the lid hollow part 3a can be removed and cleaned.

[0026] The lid 3 has a float valve pin body 36 held in the lid cap 35 via an elastic body 36A such as a spring. The float valve pin body 36 can be inserted at its lower part (pin body) into the small air hole 35a from above, and can reach the bottom of the small air hole 35a by pushing the upper part. At this time, the recoil force of the elastic body 36A causes the upper part of the float valve pin body 36 to be pushed multiple times to perform a repeated operation, making it easier to remove foreign matter from the small air hole 35a and its vicinity, which will be described later.

[0027] The lid 3 has a guide rod 37 extending downward from the lid cap portion 35. As described later, the guide rod 37 passes through a guide rod insertion hole 5a of the float valve 5, and a nut is fastened to the lower portion of the guide rod 37 as a stopper that stops the float valve 5 from descending any further (see Figs. 3 and 6). As a result, the guide rod 37 guides the float valve 5, which moves up and down according to the position of the water surface (water level).

[0028] The lid 3 also has a float valve body rotation stop rod 37A extending downward from the lid cap portion 35 (see FIG. 6). The float valve body rotation stop rod 37A can prevent the float valve body 5 from rotating around the guide rod 37 as an axis.

[0029] The floating valve element 4 is disposed in the valve box hollow portion 2a of the valve box 2 as described above. The floating valve element 4 can block the large air hole 32b of the cover body 3 from below depending on the water surface position (water level) of the valve box hollow portion 2a. The floating valve element 4 can be, for example, roughly disk-shaped as shown in the figures (see Figures 4 and 7). The floating valve element 4 has a flat upper end surface so that it can be in close contact with the cover body 3 (specifically, O-rings 33A, 33B). The floating valve element 4 also has a central hole 4a that penetrates in the vertical direction. The floating valve element 4 has a predetermined number of legs 41 (three in this embodiment) at the bottom (see Figure 7).

[0030] The float valve 5 is a long, roughly cylindrical member, and as described above, is disposed in the lid hollow portion 3a of the lid 3. The float valve 5 can close the small air hole 35a from below depending on the position of the water surface (water level) in the lid hollow portion 3a.

[0031] The float valve body 5 is formed with a guide rod body insertion hole 5a through which the guide rod body 37 of the cover body 3 is inserted. The guide rod body insertion hole 5a is a through hole. The float valve body 5 is also formed with a rotation stop hole 5b through which the float valve body rotation stop rod body 37A of the cover body 3 is inserted (see FIG. 8).

[0032] The float valve body 5 has an upper member 51 and a lower member 52, and the upper member 51 and the lower member 52 are connected to each other by a connecting member 5c (a hexagon socket head bolt in this embodiment) so as to be inclinable with each other. In this embodiment, the connecting member 5c is provided near the end of the upper member 51.

[0033] In the air valve 1 described above, when the piping switches from a water-passing state to a water-cut state, for example, when the upstream pump is stopped (or the upstream valve is closed), air is drawn in through the large air hole 32b, and the atmosphere is guided into the piping through the valve body hollow section 2a and the water guide section 2b (and the open water stop valve 10). Here, the large air hole 32b is formed in the vertical direction or at an oblique angle in the vertical direction as described above, so that a large amount of atmosphere can smoothly flow into the piping through the valve body hollow section 2a and the water guide section 2b. This allows for extremely efficient air intake. In this respect, it is more preferable to form the large air hole 32b at an oblique angle in the vertical direction as described above.

[0034] In addition, in the air valve 1, when the piping is switched from a water-cut state to a water-passing state, for example, when the upstream pump is operated (or the upstream valve is opened), the air (including other gases) in the piping is rapidly exhausted (large-volume exhausted) to the outside through the large air hole 32b with the water stop valve 10 open. Large-volume exhaust is performed from when water enters the valve box hollow portion 2a until the floating valve body 4 comes into close contact with the cover body 3 from below and closes the large air hole 32b. Here, the large air hole 32b is formed in the vertical direction or at an oblique angle in the vertical direction as described above, so that the air in the piping can be smoothly exhausted in large quantities from the water guide portion 2b and the valve box hollow portion 2a to the outside through the large air hole 32b. Therefore, extremely efficient large-volume exhaust is possible. In this respect, it is more preferable to form the large air hole 32b at an oblique angle in the vertical direction as described above.

[0035] After the large amount of exhaust is finished, a small amount of exhaust is performed. By the small amount of exhaust, the air in the hollow portion 3a of the cover is exhausted through the small air hole 35a, the water level rises gradually, and the float valve body 5 rises along the guide rod body 37. When the small air hole 35a is a predetermined distance from the water level, the float valve body 5 (more specifically, the upper surface of the upper member 51) comes into contact with the valve seat 35b and blocks the small air hole 35a from below, and exhaust stops.

[0036] After that, when the water in the pipe flows normally and air is mixed with the water, the air mixes with the water and infiltrates from the pipe into the hollow part 3a of the cover. Then, when the amount of air above the water surface increases and the water surface drops, the small air hole 35a opens.

[0037] Here, if the small air hole 35a is formed on the central axis of the cover body 3, and the connecting member 5c that connects the upper member 51 and the lower member 52 of the float valve body 5 is located near the end of the upper member 51 and is a predetermined distance away from the central axis, a moment force (moment of force) approximately equal to the descending force of the lower member 52 multiplied by the predetermined distance acts on the contact portion between the upper member 51 and the valve seat 35b. This causes the upper surface of the upper member 51 to tilt, and the upper member 51 and the valve seat 35b can be easily pulled apart even if they are tightly attached to each other (see FIG. 9).

[0038] In this way, the top surface of the upper member 51 tilts or drops overall, opening the small air hole 35a and again venting a small amount of air. Then, when the water level rises due to the small amount of air venting and the small air hole 35a is a specified distance from the water level, the float valve body 5 closes the small air hole 35a from below and venting stops.

[0039] Foreign matter can be removed from the large air hole 32b and its vicinity by regular or irregular cleaning using the floating valve pin body 34. Removing foreign matter maintains the opening of the large air hole 32b by the floating valve body 4 during intake and the opening and closing of the large air hole 32b by the floating valve body 4 during large-volume exhaust, making it easier to maintain efficient intake and large-volume exhaust.

[0040] Specifically, the large air hole 32b and its vicinity can be cleaned as follows. That is, in the first step, with the water stop valve 10 closed, the upper part of the float valve body pin body 36 is pressed, and its tip reaches below the small air hole 35a and pokes the float valve body 5. This tilts the upper surface of the float valve body 5 or lowers it entirely, opening the small air hole 35a. This causes water or air to be sucked into the small air hole 35a and then discharged, lowering the pressure (water pressure and air pressure) inside the air valve 1 (the cover body hollow portion 3a and the valve box hollow portion 2a).

[0041] Next, in the second step, the upper part of the floating valve body pin body 34 is pressed, and its tip reaches below the large air hole 32b and pokes the floating valve body 4. This tilts the upper surface of the floating valve body 4 and lowers it entirely, opening the large air hole 32b. Thereafter, with the large air hole 32b open, the water stop valve 10 is opened, and the floating valve body pin body 34 is raised, allowing the large air hole 32b and any foreign matter in its vicinity to be expelled from the large air hole 32b together with water or air, before the large air hole 32b is blocked again by the floating valve body 4.

[0042] In this way, when the first step is performed before the second step, the water pressure inside the air valve 1 drops, weakening the force pushing back the floating valve pin body 34 from the inside, so that the tip of the floating valve pin body 34 can be easily pushed down to below the large air hole 32b. Note that the first and / or second steps can be performed multiple times as necessary.

[0043] In addition, the small air hole 35a and its vicinity can be cleaned to remove foreign matter on a regular or irregular basis using the float valve pin body 36. Removing foreign matter maintains the opening and closing action of the small air hole 35a by the float valve pin body 36 when exhausting a small amount of air, making it easier to maintain efficient exhaust of a small amount of air.

[0044] Specifically, the small air hole 35a and its vicinity can be cleaned as follows. That is, first, with the water stop valve 10 open, the upper part of the float valve body pin body 36 is pressed, and its tip reaches below the small air hole 35a and pokes the float valve body 5. This tilts the upper surface of the float valve body 5 or lowers it entirely, opening the small air hole 35a. After that, the float valve body pin body 36 is raised, and the small air hole 35a and foreign matter in its vicinity are sucked into the small air hole 35a together with water or air and discharged until the small air hole 35a is blocked again by the float valve body 5 due to water pressure. This process (step) can be performed multiple times as necessary.

[0045] In this way, the air valve 1 (the large air hole 32b, the small air hole 35a, and their vicinity) can be cleaned without disassembling the air valve 1 (for example, by removing the cover 3 from the valve box 2 and / or removing the cover cap part 35 from the cover 3). This cleaning is particularly useful when the air valve 1 is used in a pipe such as a sewer, an industrial water pipeline, or an agricultural water pipeline, through which water of inferior quality flows compared to tap water from a water supply system. Although the small air hole 35a is usually separated from the water surface, it is not rare that foreign objects come into contact with the small air hole 35a together with the water when the water surface suddenly shakes due to a change in water pressure in the pipe (for example, due to compression of the air layer caused by the water hammer phenomenon, etc.).

[0046] In addition, before disassembling the air valve 1 for maintenance, the upper part of the float valve pin body 36 is pressed with the water stop valve 10 closed, and its tip is brought to the bottom of the small air hole 35a to poke the float valve body 5. This tilts the top surface of the float valve body 5 or lowers it entirely, opening the small air hole 35a. This causes water or air to be sucked into the small air hole 35a and discharged, lowering the pressure (water pressure and air pressure) inside the air valve 1 (the lid body hollow part 3a and the valve box hollow part 2a). This process (step) can prevent the water or air inside from spraying out when the lid body 3 is subsequently removed from the valve box 2 or the lid body cap part 35 is removed from the lid body 3. This maintenance can maintain efficient intake and exhaust.

[0047] The above describes an air valve according to an embodiment of the present invention. However, the present invention is not limited to the above-described embodiment, and various design modifications are possible within the scope of the matters described in the claims. [Explanation of symbols]

[0048] 1 Air valve 10. Water stop valve 2 Valve box 2a Valve box hollow part 2b Water conveyance section 21 Valve box cylindrical part 22 Valve body flange 22a Valve box fastening hole 3 Lid 3' Plate 3A fastener 3a Lid hollow part 3aa Lower side opening 31 Lid cylindrical part 311 Lower lid cylindrical part 312 Upper lid cylindrical part 32 Lid flange 32a Lid fastening hole 32b Large air hole 33A, 33B O-ring 34 Pin body for floating valve body 34A Elastic body 34B Elastic body holding cylinder 35 Lid cap part 35a Small air hole 35b Valve seat 35c Recess 36 Float valve pin body 36A Elastic body 37 Guide rod body 37A Float valve body anti-rotation rod body 38 External air vent 4 Floating valve disc 4a Central hole of floating valve body 41 Legs 5 Float valve body 5a Guide rod body insertion hole 5b Rotation stop hole 5c Upper and lower member connecting member 51 Upper part 52 Lower member

Claims

1. An air valve having a large air hole and a small air hole, a valve box having a valve box hollow portion therein and a valve box flange portion around the vicinity of an upper opening of the valve box hollow portion; a cover having a hollow cover portion therein, a cover flange portion around the periphery of the vicinity of a lower opening of the hollow cover portion which is fastened to the valve box flange portion of the valve box, a cover cap portion in which the small air hole is formed, the lower opening of the hollow cover portion communicating with the valve box hollow portion of the valve box, an upper opening of the large air hole being formed on an upper surface of the flange portion of the cover, and the lower opening communicating with the valve box hollow portion of the valve box; A floating valve body that is disposed in the valve box hollow portion of the valve box and can block the large air hole from below, and has a central hole penetrating in the vertical direction; a float valve body that is disposed in the hollow portion of the lid body and that can close the small air hole from below; It is equipped with An air valve in which a floating valve pin that can be inserted into the large air hole from above is held by the cover via an elastic body.

2. 2. The air valve according to claim 1, The air valve has a float valve pin body that can be inserted into the small air hole from above and is held on the cover body.

3. The air valve according to claim 1 or 2, The lid has a guide rod extending downward from the lid cap portion, The float valve body has a guide rod body insertion hole formed therein, through which the guide rod body passes.

4. An air valve having a large air hole and a small air hole, a valve box having a valve box hollow portion therein and a valve box flange portion around the vicinity of an upper opening of the valve box hollow portion; a cover having a hollow cover portion therein, a cover flange portion around the periphery of the vicinity of a lower opening of the hollow cover portion which is fastened to the valve box flange portion of the valve box, a cover cap portion in which the small air hole is formed, the lower opening of the hollow cover portion communicating with the valve box hollow portion of the valve box, an upper opening of the large air hole being formed on an upper surface of the flange portion of the cover, and the lower opening communicating with the valve box hollow portion of the valve box; A floating valve body that is disposed in the valve box hollow portion of the valve box and can block the large air hole from below, and has a central hole penetrating in the vertical direction; a float valve body that is disposed in the hollow portion of the lid body and that can close the small air hole from below; Equipped with The lid has a guide rod extending downward from the lid cap portion, The float valve body has a guide rod body insertion hole through which the guide rod body is inserted, The float valve body is an air valve having an upper member and a lower member, the upper member and the lower member being connected to each other so as to be able to tilt.

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