JP6438058B2 - 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.

In general, water pipes such as water pipes and agricultural water pipes are designed so that air (including other gases mixed in the air in this specification) accumulates therein and does not hinder water flow. Is provided with an air valve for discharging air out of the pipe. FIG. 6 shows a conventional general air valve, which is the same as the conventional air valve described in Patent Document 1 invented by the present inventor. 6A is a front view and FIG. 6B is a cross-sectional view. The air valve 101 has a vent 102a at the upper end and a water vent 102b at the lower end.
A valve box 102 having a hollow portion 102c inside the lower portion of the vent hole 102a and a water guide portion 102d below the vent hole 102a and connected to the water pipe 100 at the water vent hole 102b, and air facing the vent hole 102a of the valve box 102 A lid 103 having a large air hole 103a for discharging and attached to the valve box 102
A valve body guide 105 disposed in the hollow portion 102 c of the valve box 102, a spherical float valve body 106 disposed inside the valve body guide 105, and an inside of the valve body guide 105. The floating valve body 107 is provided above the float valve body 106 and has a small air hole 107a facing the large air hole 103a of the lid 103. More specifically, the valve box 102 has a cock 124 at an intermediate portion of the water guide portion 102d. The lid 103 includes a separate outer lid 103A, an upper inner lid 103Ba, and a lower inner lid 103Bb, and lid fixing bolts 141, 141,...
And are fixed to the valve box 102 by nuts 142, 142,. Further, the valve body guide 105 has window holes through which air and water can be circulated at appropriate positions on the upper side and the bottom of the side part.
The floating valve body 107 has a valve seat 171 that protrudes slightly downward at the center, and a small air hole 107a is formed in the valve seat 171. Patent Document 1 proposes obtaining an effect such as downsizing by devising a spherical float valve element 106 as a columnar float valve element.

The operation of the air valve 101 is as follows. That is, when the cock 124 attached to the valve box 102 is opened, the air in the water conduit 100 and the valve box 102 is rapidly exhausted (large amount of exhaust) from the large air hole 103a due to the water pressure. When water enters the hollow portion 102c of the valve box 102 from the water conduit 100, the floating valve body 107 and the float valve body 106 rise as the water level rises. As a result, as shown in FIG. 7A, the floating valve body 107 is in close contact with the lower inner lid body 103Bb to close the large air hole 103a, and the float valve body 106 is further connected to the floating valve body 10.
7 and closes the small air hole 107a so that the hollow portion 102c of the valve box 102 has an air reservoir A and a water reservoir W up and down, and is completely sealed. If air enters the hollow portion 102c of the valve box 102 from the water pipe 100 after entering such a sealed state, the valve box 10
The pressure in the air reservoir A in the second hollow portion 102c is increased, the water is retreated and the water level is lowered.
The float valve body 106 descends as the water level falls, while the floating valve body 107 remains pushed up by the internal pressure of the air reservoir A. Then, as shown in FIG. 7 (b), the float valve body 106 moves away from the floating valve body 107, and the air is discharged to the outside of the valve box 102 through the small air hole 107a and the large air hole 103a ( Exhausted under pressure). Then, the water level rises again, and the hollow portion 102c of the valve box 102 is completely sealed as shown in FIG.

In such an air valve 101, due to adhesion of dust or the like, the small air hole 107 a remains open without being blocked by the float valve body 106, and water leaks, or conversely, the floating valve body 107 and the float valve body 106. Even if the water level drops, the float valve element 106 does not descend and the small air hole 107a remains blocked, and air may not be discharged. For this reason, maintenance work is carried out urgently regularly or when a failure occurs.
The air valve 101 is disassembled.

JP 2005-61618 A

However, the outer lid 104 is attached to the valve box 102 by a plurality of lid fixing bolts 141, 141,.
Since it is fixed using..., The air valve 101 must be disassembled using a tool each time as shown in FIG. That is, as shown in FIG. 8A, after the nuts 142, 142,... Are removed from the lid fixing bolts 141, 141,.
3A is removed, and as shown in FIG. 8B, lid fixing bolts 141, 141,.
Loosen and remove, and remove the upper inner lid body 103Ba and the lower inner lid body 103Bb. And as shown in FIG.8 (c), the valve body guide 105, the float valve body 106, and the floating valve body 107 are taken out from the hollow part 102c of the valve box 102. FIG. Thereafter, when the inspection, cleaning, or repair work is completed, the valve body guide 105, the float valve body 106, and the floating valve body 107 are moved to the hollow portion 1 of the valve box 102.
02c, the lower inner lid 103Bb, the upper inner lid 103Ba, and the outer lid 103A are connected to the valve box 1
02 and fixed with lid fixing bolts 141, 141,. As described above, disassembling the air valve 101 in maintenance work is very complicated.

On the other hand, the air valve 101 is installed in a manhole or a water pipe bridge on the road. However, since the traffic is temporarily stopped in the work in the manhole, the maintenance work needs to be performed quickly although it is complicated as described above. There is.

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 capable of more easily and quickly performing assembly and disassembly work including maintenance work.

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 box connected to a water pipe at the water flow opening, a large air hole facing the vent hole, and a lid attached to an upper end of the valve box; and the valve box A valve body guide disposed in the hollow portion of the valve body, a float valve body disposed inward of the valve body guide, and disposed inward of the valve body guide and above the float valve body, A floating valve body having a small air hole facing the large air hole of the lid body, and a first position where the lid body is coupled to the valve box, and the coupling of the lid body is released. a lever operable from the outside of the valve body and a second position to allow separation from the valve body, a removable cover enclosing the outside of the valve body Wherein the cover is housed said lever is in said first position inside, characterized in that to prevent the operation to the second position by the unexpected external force.

The air valve according to claim 2, wherein the lever is supported on the outer surface of the front Kiben box, between a first position which is brought down along the outer side, was filed with respect to the outer surface Ri rotational operable der between the second position, pressed against the concave engagement groove formed in the lid in the first position coupling the lid to said valve body, said first The coupling of the lid body is released at a position 2 away from the engagement groove.

Air valve according to claim 3, the valve body is in communication with the hollow portion from the outside, the screw has screw holes for screwing are formed,該螺Ko holes, and the water passage tube and the hollow portion When the screw is removed at the time of disassembling while discontinuing the communication, the floating valve body that rises as the water level in the hollow portion rises closely contacts the lid body to block the large air hole, and further the float valve After the body is in close contact with the floating valve body and closes the small air hole, the float valve body does not descend even if the water level is lowered, and the small air hole remains closed and the hollow part is closed. In the abnormal operation in which the air accumulated in the air is not discharged, air is ejected, and the float valve body is lowered, and water is ejected in the normal operation in which the small air hole is not blocked.
Air valve according to claim 4, said cover, said has fixing holes at positions corresponding to the screw hole is formed, the cover is screwed the screw through the fixing hole to the screw hole Thus, it is attached to the valve box.

  According to the air valve of the present invention, since the lever that can connect and release the lid body to the upper end portion of the valve box by operation from the outside of the valve box is provided, the maintenance work can be easily and quickly performed without using a tool. Assembling and disassembling operations can be performed, and since the lever in the first position where the lid is coupled is housed inside and the cover surrounding the outside of the valve box is provided, the second position is released. It is possible to improve the safety by preventing erroneous operation of the lever, and further improve the aesthetics.

It is (a) front view and (b) sectional view of an air valve concerning a 1st embodiment of the present invention. It is sectional drawing explaining the screw etc. for fixing the cover of an air valve same as the above. It is sectional drawing explaining operation | movement of an air valve same as the above. It is an expanded fragmentary sectional view explaining a motion of the float valve body of an air valve same as the above. It is sectional drawing which shows the decomposition | disassembly procedure 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 explaining operation | movement of an air valve same as the above. It is sectional drawing which shows the decomposition | disassembly procedure of an air valve same as the above.

The best mode for carrying out the present invention will be described below with reference to the drawings. 1A is a front view of an air valve 1X according to a first embodiment of the present invention, and FIG. 1B is a cross-sectional view (a cross-sectional view in front view).
2 (a) and 2 (b) are cross-sectional views illustrating a cover fixing screw (screw) 41 and the like of the air valve 1X, and FIGS. 3 (a) and 3 (b) illustrate the operation of the air valve 1X. Sectional view to explain, FIG.
b) is an enlarged partial sectional view for explaining the movement of the float valve body 6 of the air valve 1X, and FIGS.
) Are cross-sectional views sequentially showing a procedure for disassembling the air valve 1X. This air valve 1X has a vent 2a at the upper end, a water inlet 2b at the lower end, a hollow portion 2c inside the vent 2a, and a water guide 2d below the vent 2b. A valve body 2 connected to the water pipe 100, a lid 3 having a large air hole 3a for exhausting air facing the vent 2a of the valve box 2, and attached to the valve box 2,
The valve body guide 5 disposed in the hollow portion 2c of the valve box 2, the float valve body 6 disposed inside the valve body guide 5, and the inside of the valve body guide 5 and the float valve body 6 Large air hole 3 of the lid 3 that is arranged above
and a floating valve body 7 having a small air hole 7a facing a. Moreover, the lever cover 4 attached to the valve box 2 so that attachment or detachment is possible is further provided. Hereinafter, the structure of these components will be described together with their functions.

First, the valve box 2 will be described. The valve box 2 has an outer shape similar to a wine glass as a whole. The hollow portion 2c of the valve box 2 has a relatively wide space from the vent 2a at the upper end to the middle in the vertical direction. The water guide portion 2d communicates with the hollow portion 2c, and is a substantially cylindrical pipe having a smaller diameter than the hollow portion 2c.

The valve box 2 has an operation portion 22a on one side and an engagement groove 3 of a lid 3 to be described later on the other side of the valve box 2.
A lever 22 having an engaging portion 22b that can be brought into pressure contact with b is rotatably provided. Specifically, two support shaft bodies 21 and 21 are provided on the outer surface of the valve box 2 near the vent hole 2a, and the lever 2
An intermediate portion between the two operation portions 22a and the engaging portion 22b is rotatably supported. Further, on the side wall forming the outer surface of the valve box 2, there is provided a lever opening 2e that allows the engaging portion 22b to rotate and protrude into the hollow portion 2c. Note that the lever opening 2e may have a hollow shape by removing the upper side wall. The engaging portion 22b of the lever 22 has a so-called eccentric cam shape, and the distance from the support shaft 21 to the inner circumferential surface in the horizontal direction is the first position where the operating portion 22a is substantially vertical ( The lever 22 is long) and is short at the second position of the lever 22 (the state in which the lever 22 is raised) where the operating portion 22a is substantially horizontal (the state where the lever 22 is raised), and gradually changes according to the rotation. Yes. The support shaft 21 and the lever 22 are not limited to two and may be three or more.

Below the lever opening 2e of the valve box 2, the inner side surface of the side wall is bent slightly inward to form a lid receiving portion 2f with which the lower end of an inner lid portion 3B of the lid 3 to be described later contacts. . This lid receiving portion 2f
The inner lid portion 3B is fitted from the vent 2a of the valve box 2 and an elastic packing ring 23 is fitted so as to alleviate the impact when the lower end comes into contact and to improve the adhesion. Yes.

In addition, the operation unit 22a when the lever 22 is in the first position (a state where the lever 22 is tilted).
A plurality of (for example, four) lever cover receiving portions with which the outer side surface of the valve box 2 protrudes outwardly in a bowl shape and a lower end surface of a cylindrical lever cover 4 to be described later abuts. 2g, 2g
.... The tip of the lever cover receiving portion 2g protruding in a bowl shape is preferably formed in a stepped shape with the upper portion removed so that the lever cover 4 can be easily placed at the correct position. Further, on the outer side surface of the valve box 2, a cover fixing portion 2g ′ protruding outward to the extent that it abuts on the inner surface of the lever cover 4 is provided separately from the lever cover receiving portion 2g. The cover fixing portion 2g ′ is formed with a screw hole 2h communicating with the hollow portion 2c from the outside (see FIG. 2), and an internal thread is engraved on the inner peripheral surface thereof. The cover fixing portion 2g ′ can be shared by one of the lever cover receiving portions 2g.

In addition, the inner surface near the lower part of the hollow portion 2c partially protrudes inward, and a plurality of (for example, four) valve body guide receivers for receiving the lower end portion of a bottomed cylindrical valve body guide 5 to be described later. Part 2i, 2i
....

A cock 24 is attached to an intermediate part of the water guide part 2d below the hollow part 2c, and the opening and closing of the cock 24 controls the inflow and stoppage of water from the water conduit 100 to the hollow part 2c of the valve box 2. Further, the outside of this portion is covered with a cylindrical cock cover 25 in order to prevent the cock 24 and the valve box 2 from being damaged by the impact load from the side. The valve box 2 has a water inlet 2b at the lower end.
The flange portion 2j is provided in the periphery of the flange portion 2 so that the water inlet 2b communicates with the inside of the water conduit 100.
j is joined to the water pipe 100.

Next, the lid 3 will be described. The lid 3 has an outer lid portion 3A shaped like a thin plate, an inner lid portion 3B having a substantially cylindrical shape and having a large air hole 3a in the upper portion, and a certain gap G interposed therebetween. A plurality of (for example, three) column portions 3C to be connected are integrally formed. Inner lid 3B
The lower cylindrical portion 3b extending below the lever 22 and 22 of the valve box 2 is in the second position (lever 2
2 and 22), the lower end of the valve box 2 comes into contact with the lid receiving part 2f of the valve box 2. On the outer side surface of the lower cylindrical portion 3b, a concave engaging groove 3c is formed in which the above-described engaging portion 22b of the lever 22 can be pressed. Outer cover 3
A prevents rainwater or the like from entering the hollow portion 2c of the valve box 2 from the large air hole 3a, and has a larger diameter than the inner lid portion 3B. And the air of the hollow part 2c of the valve box 2 is the large air hole 3a,
It flows out to the outside through the gap G.

When the levers 22 and 22 are rotated from the second position to the first position (the levers 22 and 22 are tilted) with the inner lid portion 3B fitted, the engaging portions 22b and 22b are used for the lever. The engagement groove 3c is pressed from both sides after passing through the openings 2e and 2e, so that the lid 3 is firmly coupled and mounted on the valve box 2 so as not to come off due to the internal pressure of water or air. Therefore, the engagement groove 3c is formed in an annular shape with a concave curve that is gentle in the vertical direction so that the pressure contact from both the engagement portions 22b and 22b is possible. When the levers 22 and 22 are rotated again to the second position (the state in which the levers 22 and 22 are raised), the engaging portions 22b and 22b are engaged with the engaging grooves 3c.
The pressure contact state is released and the cover 3 and the valve box 2 can be separated. Note that elastic double O-rings 31 and 32 are fitted around the large air hole 3a of the inner lid portion 3B so that the floating valve body 7 and the valve body guide 5 are in good contact with each other. Yes.

The cylindrical lever cover 4 is positioned at a position corresponding to the screw hole 2h of the cover fixing portion 2g ′ when the lower end of the cylindrical lever cover 4 is brought into contact with the lever cover receiving portions 2g, 2g,. A cover fixing hole 4a is formed (see FIG. 2). Further, the lever cover 4 has a height and an inner diameter such that the levers 22 and 22 in the first position can be almost completely accommodated with the lower end thereof being in contact with the lever cover receiving portions 2g, 2g,. Have. As shown in FIG. 2A, an attached cover fixing screw 41 connected to the lever cover 4 or the valve box 2 by a wire, a chain, or the like is provided. The lever cover 4 is detachably attached to the valve box 2 by the screw 41. When attaching the lever cover 4 to the valve box 2, as shown in FIG.
The screw 41 is passed through the cover fixing hole 4 a of the lever cover 4 and screwed into the screw hole 2 h of the valve box 2. The screw 41 is preferably a butterfly bolt or a bolt with a handle as shown in the figure, which can be screwed even without a tool. Further, it is desirable that the hollow portion 2c side of the screw hole 2h is narrowed so that the tip of the screw 41 protrudes slightly inward so that dust or the like is difficult to adhere.

The lever cover 4 prevents the levers 22 and 22 from being accidentally set to the second position due to an unexpected external force when the air valve 1X is installed not in a manhole or the like. Can also improve aesthetics. Further, the screw 41 and the screw hole 2h of the valve box 2 have an excellent effect when the air valve 1X is disassembled, which will be described later.

The bottomed cylindrical valve body guide 5 has window holes 5a and 5b through which air and water can be circulated at appropriate positions on the upper side and the bottom of the side. The window hole 5 a on the upper side may be a notch from the upper end of the valve element guide 5. The valve body guide 5 has its upper end abutted against the O-ring 32 of the lid 3 and the lower end portion of the valve body guide 5 abutted against the valve body guide receiving portion 2 i of the valve box 2, thereby fixing the position.

The float valve body 6 is lighter in specific gravity than water. The float valve body 6 has a long and substantially cylindrical shape, and an upper end portion 6a thereof is tapered in a truncated cone shape. The tip has a curved surface in consideration of adhesion when the air valve 1X is installed inclined from the vertical direction, difficulty in fixing to the valve seat 71, and the like. In this way, the curved surface at the tip can be designed freely, which is different from the float valve body 106 of the air valve 101 of FIG. 6 described in the background art section.

The floating valve body 7 is generally disc-shaped, and an inverted truncated cone-shaped recess 7 b corresponding to the truncated cone-shaped upper end 6 a of the float valve body 6 is formed on the lower surface. At its center, it protrudes slightly downward so that it can be in close contact with the float valve body 6 and has a flat surface with a resilient valve seat 71, and a small air hole 7 a at the center of the valve seat 71. It is formed so as to penetrate vertically. In addition, the floating valve element 7
A small hole 7c for the passage of air is formed between the outer peripheral surface of the first and second recesses 7b. The idle valve element 7 is lighter than the float valve element 6. When the float valve body 6 is separated from the idle valve body 7, the air in the hollow portion 2c of the valve box 2 is discharged from the small air hole 7a. When the float valve body 6 is in contact with the floating valve body 7, the upper end portion 6a of the float valve body 6 is fitted into the recess 7b, thereby closing the small air hole 7a. The floating valve body 7 has a convex portion 7d formed on the upper surface thereof.
The convex portion 7d is smaller than the large air hole 3a of the lid body 3, and when the floating valve body 7 rises, the convex portion 7d is loosely fitted into the large air hole 3a, and the peripheral portion of the convex portion 7d is the lid body. 3 0-rings 31 with good adhesion.

The air valve 1X operates as follows. That is, the cock 24 is opened and the water pipe 1
When water enters the hollow portion 2c of the valve box 2 from 00, the air in the hollow portion 2c of the valve box 2 is rapidly exhausted from the large air hole 3a due to the water pressure. At the same time, the floating valve body 7 and the float valve body 6 rise as the water level rises. As a result, as shown in FIG.
Since the large air hole 3a is in close contact with the upper surface of B, and the float valve body 6 is in close contact with the floating valve body 7 and closes the small air hole 7a, the hollow portion 2c of the valve box 2 has an air reservoir A in the vertical direction. And a water pool W is formed, which is completely sealed. After such a sealed state, when air enters the hollow portion 2c of the valve box 2 through the water pipe 100 and enters the hollow portion 2c of the valve box 2, the pressure of the air reservoir A in the hollow portion 2c of the valve box 2 increases, and the water is retreated. The water level goes down. The float valve body 6 descends as the water level falls, while the floating valve body 7 remains pushed up by the internal pressure of the air reservoir A. Then, as shown in FIG. 3B, the float valve body 6 is separated downward from the floating valve body 7, and the air is discharged to the outside of the valve box 2 through the small air hole 7a and the large air hole 3a. . Then, the water level rises again, and the hollow portion 2c of the valve box 2 is completely sealed.

Here, the normal valve such as the air valve 101 of FIG. 6 described in the background art section is generally difficult to operate normally when tilted by 2 degrees or more from the vertical direction, and is installed within that range. When the float valve body 6 of the air valve 1X according to the embodiment of the present invention is installed in the vertical direction, the float valve body 6 is in close contact with the surface of the valve seat 71 of the floating valve body 7 as shown in FIG. As shown in FIG. 4 (b), the float valve element 6 is long in the case where it is installed from the vertical direction. Therefore, the water level is usually in contact with the inner side surface of the upper side wall while the cylindrical side surface is in contact with it. The tip of the floating valve body 7 comes into close contact with the surface of the valve seat 71 of the floating valve body 7. The relative positional relationship between the float valve element 6 and the valve seat 71 in FIG. 4B is such that the float valve element 6 in FIG. 4A is in the radial direction, and the gap g between the float valve element 6 and the inner side surface of the side wall. Only translated. Accordingly, the inverted frustoconical recess 7b of the floating valve body 7 is sized so as not to hinder its parallel movement. Further, the tip of the upper end portion 6a of the float valve body 6 is in close contact with the valve seat 71 in a direction close to a flat surface. In the experiments of the present inventor, the length (height) L of the float valve body 6 is 1 to 3
A curved surface with a radius of curvature up to twice is desirable, and it has been confirmed that the air valve 1X operates without problems even when it is inclined 30 degrees from the vertical direction. Therefore, it is possible to install the air valve 1X at a place where maintenance work can be performed easily and quickly, whether it is up or down.

Next, a procedure for maintenance work of the air valve 1X will be described. First, the manhole cover or the like is removed as necessary so that the air valve 1X appears. At this time, if the water overflows, there is a possibility that the small air hole 7a remains open without being blocked by the float valve body 6 due to the attachment of dust or the like and leaks. Next, the cock 24 is closed and the water pipe 100 and the valve box 2 are closed.
The communication with the hollow portion 2c is blocked so that water does not flow in during the work.

Next, the screw 41 of the cover fixing screw 41 is loosened and removed. At this time,
Although water spouts from the screw hole 2h of the valve box 2, the normal operation of the air valve 1X can be confirmed by the water pressure. Even if the floating valve element 7 and the float valve element 6 are fixed and the water level drops, the float valve element 6
If the small air hole 7a remains blocked and the air is no longer discharged, the air is ejected. In this way, even if the air valve 1X is not disassembled, it can be determined by observation from the outside whether or not the air valve 1X is operating normally. If the air valve 1X does not operate normally, the air valve 1X will be disassembled. At that time, the internal pressure due to the accumulated compressed air can be reduced and the disassembly work such as removal of the lid 3 can be started. It becomes possible to work quickly while avoiding the possibility of the lid 3 being blown off by an abnormal internal pressure at the moment when the positions 22 and 22 are set to the second position. Also in the air valve 101 of FIG. 6 described in the background art section, if the screw hole communicating with the hollow portion 102c from the outside is formed and the screw is screwed, the air valve 101 need not be disassembled. By loosening the screw and observing whether water is ejected or air is ejected, it is possible to determine whether the floating valve body 107 and the float valve body 106 are firmly attached to each other.

Next, as shown in FIG. 5A, the lever cover 4 is removed and the lid 3 is removed. As shown in FIG. 5B, the levers 22 and 22 are moved to the second position, and the pressure contact state between the lid 3 and the levers 22 and 22 is released. And as shown in FIG.5 (c), the cover body 3 is pulled up and removed. Here, the outer lid portion 3A and the inner lid portion 3B are integrated, and the outer lid body 103A, the upper inner lid body 103Ba, and the lower inner lid body 103B of the air valve 101 of FIG. 6 described in the background art section.
Since it is not a separate body like b, the lid 3 can be easily and quickly removed from the valve box 2.

When the inspection, cleaning, or repair work is completed, the valve body guide 5, the float valve body 6, and the floating valve body 7 are returned to the hollow portion 2c of the valve box 2, the lid body 3 is fitted, and the levers 22 and 22 are moved to the first position. At the position, the lid 3 and the levers 22 and 22 are attached in pressure contact. Then, the lever cover 4 is installed, and the screw 41 is screwed into the screw hole 2 h of the valve box 2. If necessary, replace the manhole cover, etc. Thus, the air valve 1X can be easily and quickly assembled.

That is, in the air valve 1X, the lid 3 is fixed and released by rotating the levers 22 and 22 of the valve box 2, so that the assembly including the maintenance work can be easily and quickly performed without using a tool. And disassembly work becomes possible.

As mentioned above, although the air valve which concerns on embodiment of this invention was demonstrated, this invention is not restricted to what was described in embodiment, Various design change within the range of the matter described in the claim is carried out. Is possible. For example, such an air valve can be integrally attached to a normal fire hydrant. Of course, the shapes and structures of the valve box, the lid, the valve body guide, the float valve body, the floating valve body and the like described in the embodiments can be modified as appropriate. It is also possible to easily make the air valve 1X without the cock 24.

1X Air valve 2 Valve box 2a Valve box vent 2b Valve box water inlet 2c Valve box hollow 2d Valve box water guide 2g 'Cover fixing part 2h Valve box screw hole 22 Lever 22a Lever operation part 22b Lever Engagement portion 3 lid body 3B inner lid portion 3a large air hole 3b lid cylindrical portion 3c lid engagement groove 4 lever cover 41 screw 5 valve body guide 6 float valve body 7 floating Valve body 7a Small air hole of floating valve body

Claims (4)

A valve box having a vent at the upper end, a water vent at the lower end, a hollow part inside the vent, and a water guiding part below the vent, and connected to the water pipe at the water vent A large air hole facing the vent hole, a lid attached to an upper end of the valve box, a valve body guide disposed in a hollow part of the valve box, and a valve body guide A float valve body disposed inward, and a floating valve body having a small air hole disposed inward of the valve body guide and above the float valve body and facing the large air hole of the lid body; In an air valve comprising:
Operation from the outside of the valve box between a first position where the lid is coupled to the valve box and a second position where the coupling of the lid is released to allow separation from the valve box Possible levers ,
A removable cover surrounding the outside of the valve box,
The air valve is characterized in that the cover accommodates the lever in the first position inside, and prevents an operation to the second position by an unexpected external force. The lever is
Is supported on the outer surface of the front Kiben box, a first position which is brought down along the outer side, Ri rotational operable der and a second position which is raised relative to said outer surface ,
The lid is coupled to the valve box by pressing against a concave engagement groove formed in the lid at the first position, and separated from the engagement groove at the second position. The air valve according to claim 1, wherein the coupling is released . Said valve body is in communication with the hollow portion from the outside, the screw has been threaded hole for screwing is formed,
When the screw is removed at the time of disassembling to discontinue communication between the water pipe and the hollow portion, the floating valve body that rises as the water level in the hollow portion rises closely contacts the lid body. Then, after the large air hole is closed, and the float valve body is in close contact with the floating valve body and closes the small air hole, the float valve body does not descend even if the water level is lowered. During abnormal operation in which the hole remains blocked and the air accumulated in the hollow portion is not discharged, air is blown out, and the float valve body is lowered, and water is discharged during normal operation in which the small air hole is not blocked. The air valve according to claim 1 or 2, wherein the air valve is ejected. The cover has a fixing hole at a position corresponding to the screw hole,
The cover, air valve according to claim 3, characterized in that it is attached to the screw through the fixing hole in the valve body by screwing in the screw hole.

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