JP5773487B2 - Air valve - Google Patents

Description

  The present invention relates to an air valve that discharges air accumulated inside a water pipe to the outside of the pipe.

  Conventionally, air valves for discharging the air inside the water pipe to the outside have been widely used in various places in order to prevent harmful effects caused by the accumulation of air inside the water pipe. The air valve has a function of large exhaust (rapid exhaust) that discharges (exhausts) a large amount of air in the water pipe after installation of the water pipe, investigation of the water pipe, and construction of the water pipe, and tap water is usually used. In general, a device having a function of exhausting a small amount of air mixed in a water pipe for various reasons in a state where the water pipe is flowing at a low pressure is used.

  The air valve 101 shown in FIG. 14 shows a conventional structure, and has a structure substantially the same as that disclosed in Patent Document 1 inventor of the present application. The air valve 101 has, as a basic structure, a valve box 102 having a vent 102a at the upper end, a water vent 102b at the lower end, a hollow portion 102c inside the vent 102a, and a water guide portion 102d below it. An inner lid body 103 having a large air hole 103a to be attached to the vent 102a of the valve box 102, an outer lid body (lever cover) 104 provided so as to cover the large air hole 103a, a valve A valve body guide 105 disposed in the hollow portion 102 c of the box 102, a float valve body 106 disposed inward of the valve body guide 105, and inward of the valve body guide 105 and above the float valve body 106. And a floating valve body 107 having a small air hole 107 a penetrating in the vertical direction and having an upper end surface capable of closing the large air hole 103 a of the inner lid body 103. The float valve element 106 and the floating valve element 107 have a specific gravity smaller than that of water, and the idle valve element 107 is lighter than the float valve element 106.

  The valve box 102 is usually used by connecting a separate repair valve 100 having a cock portion for controlling the intrusion of water into the hollow portion 102c between the air valve 101 and the water pipe. Further, the valve body guide 105 is formed with a window hole 105a through which air and water can be circulated at appropriate positions on the bottom and sides.

  The operation of the air valve 101 is as follows. Before water enters the hollow portion 102c of the valve box 102 from the water pipe through the repair valve 100, that is, before a large amount of exhaust is performed, as shown in FIG. 14B, the floating valve body 107 and the float valve body 106 is overlaid on the bottom of the valve element guide 105. When the cock of the repair valve 100 is opened and water enters the hollow portion 102c of the valve box 102 from the water pipe through the repair valve 100, the air in the hollow portion 102c of the valve box 102 flows into the valve element guide 105. It is pushed by the water pressure while passing through the window hole 105a, and is rapidly discharged (a large amount of exhaust) from the large air hole 103a. At the same time, the floating valve element 107 and the float valve element 106 float as the water level rises while being guided by the inner surface of the valve element guide 105. As a result, the floating valve body 107 is in close contact with the inner lid body 103 and closes the large air hole 103a.

  After a large amount of exhaust is completed in this way, a small amount of exhaust is performed. A relatively small amount of air accumulates between the idle valve element 107 and the float valve element 106, and the air reservoir A together with the water line (boundary of air and water), as shown in FIG. The float valve body 106 is pushed down, while the floating valve body 107 remains pushed up. Then, the air is discharged to the outside of the valve box 102 (a small amount of exhaust) through the small air hole 107a. When the air in the air reservoir A decreases, as shown in FIG. 15 (b), the float valve body 106 rises and closes to the floating valve body 107 to close the small air hole 107 a, and the valve box 102 is hollow. The portion 102c is sealed. Thereafter, when air enters the hollow portion 102c of the valve box 102 from the water pipe through the repair valve 100 and enters the air, and the air in the air pool A increases again, a small amount of air is exhausted again.

JP 2009-121678 A

  By the way, although the air valve is installed in various places outdoors, it is necessary to take measures to prevent rainwater and the like from entering from the outside depending on the use situation and use environment. As a countermeasure, like the outer lid body 104 of the air valve 101, the large air hole 103a and the small air hole 107a are covered, and the air path leading from them to the outside is bent and faces downward to the outside. I try to open it.

  However, depending on the location where the air valve 101 is installed, there may be a situation where the amount of rainwater or the like increases or the pressure becomes high, so that rainwater or the like can easily enter from the outside. Then, it may be difficult to sufficiently prevent rainwater or the like from entering the large air hole 103a or the small air hole 107a. In this case, in order to cope with the situation as much as possible, it is preferable to have a structure with an increased ability to prevent rainwater and the like from entering from the outside.

  The present invention has been made in view of the above reasons, and an object of the present invention is to provide an air valve having a simple structure with an increased ability to prevent intrusion of rainwater and the like from the outside.

  In order to achieve the above object, the air valve according to claim 1 has a vent at the upper end, a water vent at the lower end, a hollow portion inside the vent, and a water guide below the vent. A valve body having a large air hole, an inner lid attached to the vent of the valve box, a valve body guide disposed in a hollow portion of the valve box, and an inward of the valve body guide A float valve element disposed on the inside of the valve element guide and above the float valve element, having a small air hole penetrating in a vertical direction, and an upper end surface of which is a large air in the inner cover element An air valve comprising a floating valve body capable of closing a hole, wherein the large air hole can be closed, and an inner space communicating with the small air hole in a state where the large air hole is closed; A second small air hole penetrating through the wall forming the void, and can close the second small air hole in close contact with the outer surface of the wall with a predetermined elastic force. Characterized by comprising further comprising a stopper that sex body is provided.

  An air valve according to a second aspect of the present invention is the air valve according to the first aspect, further comprising an outer lid provided so as to cover the upper side of the large air hole, and the plug body includes the inner lid and the air valve. It is mounted between the outer lid body.

  According to a third aspect of the present invention, in the air valve according to the first aspect, the plug is attached to the inner lid by a fixture.

  The air valve according to claim 4 is the air valve according to any one of claims 1 to 3, wherein a cross-sectional area of the second small air hole is a cross-sectional area of a portion having the smallest diameter in the small air hole. It is characterized by being larger than.

  The air valve according to claim 5 is the air valve according to any one of claims 1 to 4, wherein only one second small air hole is formed.

  According to the air valve of the present invention, when the small amount is exhausted, the plug body closes the large air hole, and the elastic body closes the second small air hole in the plug body, so that the small amount of exhaust is appropriately performed. In addition, the ability to easily prevent rainwater and the like from entering from the outside can be greatly increased.

It is (a) front view and (b) sectional view of an air valve concerning an embodiment of the present invention. It is sectional drawing which shows two states at the time of small amount exhaustion of an air valve same as the above. It is a top view explaining mounting | wearing operation | movement of the inner cover body of an air valve same as the above. It is sectional drawing which shows two states after mounting | wearing the plug body at the time of small amount exhaustion of an air valve same as the above. It is a cross-sectional enlarged partial view which shows one state after mounting | wearing the plug body at the time of small amount exhaustion of an air valve same as the above. It is a cross-sectional enlarged partial view which shows another state after mounting | wearing the plug body at the time of small amount exhaustion of an air valve same as the above. It is an enlarged view of the plug body of the same air valve, wherein (a) is a plan view, (b) is a side view, and (c) is a bottom view. It is (a) front view and (b) sectional drawing of another air valve same as the above. It is sectional drawing which shows two states at the time of small amount exhaustion of another air valve same as the above. It is sectional drawing which shows two states after mounting | wearing with the plug body at the time of small amount exhaustion of another air valve same as the above. It is a cross-sectional enlarged partial view which shows one state after mounting | wearing with the plug body at the time of small amount exhaustion of another air valve same as the above. It is a cross-sectional enlarged fragmentary view which shows one state after mounting | wearing with the plug body of the other shape at the time of small amount exhaustion of another air valve same as the above. It is a cross-sectional enlarged partial view which shows one state after mounting | wearing with the plug body using another mounting method of an air valve same as the above. It is the (a) front view of the conventional air valve, (b) It is sectional drawing. It is sectional drawing which shows two states at the time of small amount exhaustion of the conventional air valve.

  Hereinafter, preferred embodiments for carrying out the present invention will be described. The air valve 1 according to the embodiment of the present invention has a structure in which a plug 8 is added to the structure of the air valve 101 described above.

  As shown in FIGS. 1 and 2, the air valve 1 has a vent 2a at the upper end, a water vent 2b at the lower end, and a hollow portion 2c in the lower interior of the vent 2a. A valve box 2 having a water guiding portion 2d below it, an inner lid 3 having a large air hole 3a and attached to the vent 2a of the valve box 2, and an upper part of the large air hole 3a are provided. An outer lid body (lever cover) 4, a valve body guide 5 disposed in the hollow portion 2 c of the valve box 2, a float valve body 6 disposed inward of the valve body guide 5, and the inside of the valve body guide 5 And a floating valve body 7 which is disposed above the float valve body 6 and has a small air hole 7a penetrating in the vertical direction and whose upper end surface can block the large air hole 3a of the inner lid body 3. Is. The float valve element 6 and the floating valve element 7 have a specific gravity smaller than that of water, and the idle valve element 7 is lighter than the float valve element 6.

  A more specific structure of the air valve 1 is as follows. The valve box 2 has two levers 21 and 21 in the circumferential direction of its outer surface. The lever 21 has a portion of a lever operation portion 21a that is operated by touching the lever 21 and a portion of an engagement portion 21b that can be pressed against an engagement groove 3b described later of the inner lid 3. Further, the valve box 2 is normally used by connecting a separate repair valve 100 having a cock portion for controlling water intrusion into the hollow portion 2c between the air valve 1 and the water pipe.

  The inner lid body 3 includes an inner lid body portion 3A having the above-described large air hole 3a at the center portion, and two inner lid body operation portions 3B and 3B provided at the peripheral edge portion of the upper surface of the inner lid body portion 3A. Are integrally formed (see FIG. 3). On the outer side surface of the inner lid main body 3A, a concave engaging groove 3b that can be pressed against the engaging portion 21b of the lever 21 is formed in an annular shape. The inner lid body operation portion 3B is formed with a step so that the insertion portion 3Ba which is an end thereof is thin, and the insertion portion 3Ba protrudes outward from the outer surface of the inner lid body portion 3A (see FIG. 3 (a)).

  The inner lid body 3 is attached to the inner lid body portion 3A by gripping the inner lid body operation portions 3B and 3B and positioning the insertion portions 3Ba and 3Ba in the recessed portions 2e and 2e of the valve box 2. It fits in the vent 2a of the box 2 (see FIG. 1 etc.). Then, the inner lid body 3 is rotated (clockwise in FIG. 3), and the insertion portions 3Ba and 3Ba of the inner lid body operation parts 3B and 3B are formed in the circumferential direction from the recesses 2e and 2e of the valve box 2. (See FIG. 3B). Then, the levers 21 and 21 are tilted so that the engaging portions 21b and 21b press the engaging groove 3b from both sides.

  The outer lid body 4 has a cylindrical shape with a top, and is attached to the valve box 2 from the lateral side by a screw 41 with a handle and from the upper side by a bolt 42.

  The valve body guide 5 has a bottomed cylindrical shape and has a window hole 5a through which air and water can flow. The window hole 5a is provided at an appropriate position on the bottom or side.

  The float valve body 6 has a substantially cylindrical shape, and the length in the vertical direction is longer than the length (diameter) in the horizontal direction, that is, is long. Further, the upper end portion 6a is tapered in a truncated cone shape, and the upper end surface 6aa which is the tip thereof is substantially flat. The higher the flatness of the upper end surface 6aa, the easier it is to come into close contact with the valve seat 71. On the other hand, since the upper end surface 6aa may be in a fixed state with the valve seat 71, it may be difficult to separate from the close state. You may make it have.

  The idler valve body 7 is generally disc-shaped, and has a recess 7b formed on the lower surface. At the center of the concave portion 7b, a slightly projecting downward so as to be in close contact with the float valve body 6 and having a substantially flat surface and an elastic valve seat 71, the small air hole 7a described above is provided. It is formed through the center of the valve seat 71 vertically. The concave portion 7b is sized such that the upper end portion 6a of the float valve body 6 can enter with a margin so that the float valve body 6 can contact the valve seat 71. A through-hole 7c is formed in the lateral direction so that air can pass from the outer peripheral surface of the idle valve body 7 to the recess 7b. Further, the floating valve body 7 has a convex portion 7d formed at the center of the upper end surface thereof, and this convex portion 7d is smaller than the large air hole 3a of the inner lid body 3 so that it can enter. Yes. Further, the floating valve body 7 is provided with an O-ring 72 at the periphery of the upper end surface thereof so as to be in good contact with the inner lid body 3.

  The plug body 8 is used by being mounted between the inner lid body 3 and the outer lid body 4 as shown in FIGS. That is, after the large amount of exhaust is initially performed, the outer lid body 4 is removed, the plug body 8 is placed so as to close the large air hole 3a, and the outer lid body 4 is attached again to mount the plug body 8. . At that time, the stopper body 8 is pressed against both the inner lid body 3 and the outer lid body 4 so as to be in close contact with both of them without a gap and fixed so as not to move up and down. Therefore, the contact portion between the inner lid 3 and the plug 8 is in a state where air does not leak.

  As shown in FIG. 7, the plug body 8 has an approximately hollow cylindrical base portion 80 formed with an inner space 8 a that is open at the bottom. When the plug 8 is in close contact with the inner lid 3, the large air hole 3 a is closed, and the inner space 8 a communicates with the small air hole 7 a of the floating valve body 7. A part of the base 80 is a wall 80a that forms the inner space 8a, and a second small air hole 8b that penetrates from the inner space 8a to the outer surface of the wall 80a is formed. Therefore, when the plug 8 is in close contact with the inner lid 3, the inner space 8a has no air passage other than the second small air hole 8b and the small air hole 7a. In addition, although the inner space part 8a may penetrate vertically, in that case, it is necessary to make it the state where the air does not leak between the plug body 8 and the outer cover body 4. FIG.

  On the outer surface of the wall 80a that forms the inner space 8a, a ring-shaped elastic body 81 that can close the second small air hole 8b closely with a predetermined elastic force is provided. The diameter of the elastic body 81 is larger than the diameter of the second small air hole 8b. The elastic body 81 is expanded by the outer surface of the wall 80a and is always in a tensioned state (a tensioned state), and thereby is in close contact with a predetermined elastic force. More specifically, a ring-shaped recess is formed at the position of the opening of the second small air hole 8b on the outer surface of the wall 80a, and the elastic body 81 is fitted therein.

  The plug body 8 is preferably made of a synthetic resin such as an ABS resin having moderate flexibility so that the plug body 8 can be easily mounted between the inner lid body 3 and the outer lid body 4. As shown in FIG. 7 and the like, it is preferable to use a packing (O-ring) 82 made of rubber or the like so that air does not leak well between the body 3.

  The operation of the air valve 1 is as follows. Before water enters the hollow portion 2c of the valve box 2 from the water pipe through the repair valve 100, that is, before a large amount of exhaust is performed, as shown in FIG. 1B, the floating valve body 7 and the float valve body 6 is the state which overlapped on the bottom part of the valve body guide 5. FIG. The plug 8 is stored elsewhere. When the cock of the repair valve 100 is opened and water enters the hollow portion 2c of the valve box 2 from the water pipe through the repair valve 100, the air in the hollow portion 2c of the valve box 2 becomes the side of the valve body guide 5 and the like. The air is pushed by the water pressure while passing through the window hole 5a, and is rapidly exhausted (a large amount of exhaust) from the large air hole 3a. At the same time, the floating valve body 7 and the float valve body 6 rise as the water level rises. As a result, the floating valve body 7 comes into close contact with the inner lid body 3 and closes the large air hole 3a (see FIG. 2 (a) and the like).

  After a large amount of exhaust is completed in this way, a small amount of exhaust is performed. A relatively small amount of air is accumulated between the floating valve element 7 and the float valve element 6, and the float valve element 6 is pushed down by the air reservoir A together with the draft line as shown in FIG. On the other hand, the floating valve body 7 remains pushed up. Then, the air is discharged to the outside of the valve box 2 (a small amount of exhaust) through the small air hole 7a. When the air in the air reservoir A decreases, as shown in FIG. 2 (b), the float valve body 6 rises and closes to the floating valve body 7 to close the small air hole 7 a, and the valve box 2 is hollow. The part 2c is sealed. Thereafter, when air enters the hollow portion 2c of the valve box 2 from the water pipe through the repair valve 100 and enters the water, and the air in the air reservoir A increases again, a small amount of air is exhausted again.

  After exhausting a small amount, the plug 8 is mounted between the inner lid 3 and the outer lid 4 at an appropriate time. Specifically, the cock of the repair valve 100 is closed, the screw 41 with the handle and the bolt 42 are removed from the valve box 2, the outer cover body 4 is removed, and then the plug body 8 is placed so as to close the large air hole 3a. Then, the outer lid 4 is attached again so that the cock of the repair valve 100 is opened. The operation of a small amount of exhaust after mounting the plug 8 is as follows. When air enters the hollow portion 2c of the valve box 2 from the water pipe into the hollow portion 2c of the valve box 2 and enters the air, and the air in the air reservoir A increases, as shown in FIGS. 6 is pushed down, while the floating valve body 7 remains pushed up. Then, air enters the inner space 8a of the plug 8 from the small air hole 7a.

  The air discharged from the small air hole 7a of the floating valve body 7 accumulates in the inner space 8a of the plug body 8, and when the pressure becomes higher than a preset pressure (set pressure), the air is discharged outside the second small air hole 8b. The ring-shaped elastic body 81 that is in close contact with a predetermined elastic force is spread. If it does so, a clearance gap will be made between the elastic body 81 and the wall 80a, and the air of the inner space part 8a will flow out from the 2nd small air hole 8b, and will be discharged | emitted outside the valve box 2. FIG. The set pressure of the inner space 8a is determined in consideration of the pressure of the hollow portion 2c of the valve box 2.

  When the air in the air reservoir A decreases, as shown in FIGS. 4 (b) and 6, the float valve body 6 rises and comes into close contact with the floating valve body 7 to close the small air hole 7a. 2 hollow part 2c will be in a sealed state. At the same time, when the pressure of the air in the inner space 8a becomes lower than the set pressure, the elastic body 81 closes the second small air hole 8b, and the inner space 8a is also completely sealed. Thereafter, when air enters the hollow portion 2c of the valve box 2 from the water pipe through the repair valve 100 and enters the water, and the air in the air reservoir A increases again, a small amount of air is exhausted again.

  Thus, when the external pressure is lower than the pressure of the hollow portion 2c of the valve box 2, the air valve 1 to which the plug 8 is attached can appropriately perform a small amount of exhaust operation.

  On the other hand, when the pressure of rainwater or the like is high and they are going to enter from the outside, the large air hole 3a having a large area is closed by the plug body 8, and the second small air hole 8b is elastic under tension. Since the body 81 is closely closed, the intrusion of rainwater or the like is prevented. Therefore, the blocking capability of the air valve 1 is very high and does not weaken even if the air valve 1 is tilted.

  Thus, the air valve 1 has a simple structure and a structure that increases the ability to prevent rainwater and the like from entering from the outside.

  The cross-sectional area of the second small air hole 8b is preferably larger than the cross-sectional area of the portion having the smallest diameter in the small air hole 7a. If it does so, the air discharged | emitted from the small air hole 7a to the inner space part 8a at the time of small amount exhaust will be discharged | emitted smoothly outside from the 2nd small air hole 8b. Therefore, the operation at the time of exhausting a small amount, that is, the operation of discharging the air at a predetermined atmospheric pressure accumulated in the upper part of the hollow part 2c of the valve box 2 to the outside of the hollow part 2c is hardly hindered by the inner space 8a. And the influence of the presence of the inner space 8a can be almost eliminated. A plurality of second small air holes 8b may be formed, but the cross-sectional area in that case indicates the total cross-sectional area.

  Preferably, only one second small air hole 8b is formed. Then, since there is only one route for intrusion of rainwater or the like, the blocking capability is high, and of course, the pressure for expanding the elastic body 81 when the air in the inner space 8a is discharged from the second small air hole 8b during a small amount of exhaust. Becomes easier to stabilize.

  Since the air valve 1 has a structure in which the plug body 8 is added to the structure of the air valve 101 described above, only the air valve 101 that has a high possibility of rainwater or the like entering from the outside is air-conditioned. The valve 1 can be easily formed.

  The plug 8 can be applied to various air valves other than the air valve 1 by changing the size, shape, and the like. The air valve 1 ′ shown in FIGS. 8 to 11 has a structure in which a plug body 8 ′ obtained by deforming the plug body 8 is added to a typical structure similar to that described as the prior art in the above-mentioned Patent Document 1. .

  As a basic structure, the air valve 1 ′ has a vent 2a ′ at the upper end, a water vent 2b ′ at the lower end, a hollow portion 2c ′ inside the vent 2a ′, and a water guide section below the vent 2a ′. A valve box 2 'having 2d', an inner lid 3 'having a large air hole 3a' and attached to the vent 2a 'of the valve box 2', and the upper part of the large air hole 3a '. An outer cover body 4 ′ provided, a valve body guide 5 ′ disposed in the hollow portion 2c ′ of the valve box 2 ′, a float valve body 6 ′ disposed inward of the valve body guide 5 ′, and a valve body A small air hole 7a 'is provided in the guide 5' and above the float valve body 6 'and penetrates in the vertical direction. The upper end surface closes the large air hole 3a' of the inner lid body 3 '. And a floating valve body 7 ′ to be obtained. The float valve body 6 'and the floating valve body 7' have a specific gravity smaller than that of water, and the floating valve body 7 'is lighter than the float valve body 6'.

  A more specific structure of the air valve 1 'is as follows. The valve box 2 ′ has a cock 24 ′ that controls intrusion of water into the hollow portion 2 c ′ at the intermediate portion of the water guide portion 2 d ′. The inner lid body 3 ′ is formed by overlapping the upper inner lid body 3 </ b> A ′ and the lower inner lid body 3 </ b> B ′. The inner lid body 3 'is screwed and fixed with one male screw to the valve box 2' by lid body fixing bolts 42 ', 42',. Are fixed to the inner lid 3 'by the other male screw of the body fixing bolts 42', 42 ', ... and nuts 43', 43 ', .... The valve element guide 5 ′ has window holes 5 a ′ through which air and water can flow at appropriate positions on the upper side and the bottom of the side part. The float valve body 6 'has a spherical shape. The floating valve body 7 'has a valve seat 71' protruding slightly downward at the center, and the small air hole 7a 'described above is formed in the valve seat 71'.

  The plug body 8 ′ of the air valve 1 ′ has a curved surface in accordance with the shape of the outer lid body 4 ′, and the other structure is the same as that of the plug body 8.

  When mounting the plug 8 'between the inner lid 3' and the outer lid 4 ', the cock 24' is closed and the lid fixing bolts 42 ', 42', ... through the nuts 43 ', 43', .. Is removed, the outer lid body 4 ′ is removed, and then the plug body 8 ′ is placed so as to close the large air hole 3a ′, and the outer lid body 4 ′ is attached again to open the cock 24 ′. To do. Further, since the operation of the air valve 1 ′ is the same as that of the air valve 1, description of the operation is omitted, but FIG. 8B shows water from the water pipe 100 ′ to the hollow portion 2c ′ of the valve box 2 ′. Shows the state before the intrusion. FIGS. 9A and 9B show a state before the plug body 8 ′ is mounted between the inner lid body 3 ′ and the outer lid body 4 ′ when exhausting a small amount. ) Is a state in which the float valve body 6 ′ is pushed down and air is discharged to the outside of the valve box 2 ′ through the small air hole 7a ′, and FIG. The air hole 7a 'is closed. FIGS. 10A, 10B, and 11 show a state after the plug body 8 ′ is mounted between the inner lid body 3 ′ and the outer lid body 4 ′ when exhausting a small amount. 10 (a) and FIG. 11 show a state in which the float valve body 6 ′ is pushed down and air is discharged to the outside of the valve box 2 ′ through the small air hole 7a ′, and FIG. 10 (b) shows the float valve body 6 In this state, “rises and closes the small air holes 7a”.

  Further, the plug body 8 ′ may be further deformed as shown in FIG. 12, and the packing (O-ring) 82 may be fitted into the peripheral portion of the lower end surface.

  The air valve according to the embodiment of the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and various designs within the scope of the matters described in the claims. It can be changed. For example, various types of inner lid bodies and outer lid bodies for mounting the plug bodies between them can be used. In addition, the plug body can be installed between the inner lid body and the outer lid body and fixed so as not to move up and down, so that the large air hole can be closed quickly and reliably with a simple structure. It is also possible to attach the plug body to the inner lid body using a fixture (for example, a screw, a bolt, a nut, etc.) without using the outer lid body. For example, as shown in FIG. 13, a female screw is formed in the inner lid body 3 and a through hole is formed in the plug body 8, and the plug body 8 can be fixed to the inner lid body 3 with a screw 83. In this way, depending on the use situation and use environment, the present invention can also be applied to a special shape with the outer lid body removed or the outer lid body does not originally exist.

DESCRIPTION OF SYMBOLS 1 Air valve 2 Valve box 2a Valve box vent 2b Valve box water inlet 2c Valve box hollow part 2d Valve box water guide part 3 Inner lid 3a Large air hole 4 Outer lid 5 Valve body guide 6 Float valve body DESCRIPTION OF SYMBOLS 7 Free valve body 7a Small air hole of free valve body 8 Plug body 8a Inner space part 8b 2nd small air hole 80a Wall which forms an inner space part 81 Elastic body

Claims (5)

A vent hole at the upper end, a water vent at the lower end, a hollow part inside the lower part of the vent, a water passage part below the vent part, and a vent hole for the valve box having a large air hole An inner lid attached to the valve body, a valve body guide disposed in a hollow portion of the valve box, a float valve body disposed inward of the valve body guide, and an inner side of the valve body guide, An air valve that is arranged above the float valve body, has a small air hole penetrating in the vertical direction, and an idler valve body whose upper end surface can block the large air hole of the inner lid body,
An inner space that communicates with the small air hole in a state in which the large air hole is blocked, and a second small air hole that passes through a wall that forms the inner space. The air valve is further provided with a plug body provided with an elastic body capable of closing the second small air hole in close contact with the outer surface of the wall with a predetermined elastic force. The air valve according to claim 1,
An outer lid provided to cover the upper side of the large air hole;
The air valve according to claim 1, wherein the plug is mounted between the inner lid and the outer lid. The air valve according to claim 1,
The air valve according to claim 1, wherein the stopper is attached to the inner lid by a fixture. The air valve according to any one of claims 1 to 3,
An air valve characterized in that a cross-sectional area of the second small air hole is larger than a cross-sectional area of a portion having the smallest diameter in the small air hole. In the air valve according to any one of claims 1 to 4,
An air valve characterized in that only one second small air hole is formed.

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