JP6096165B2 - 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. (A) is a front view of FIG. 6, (b) is a cross-sectional view. This air valve 101 has a vent 102a at the upper end, a water passage 102b at the lower end, a hollow portion 102c inside the lower portion of the vent 102a, and a water guide portion 102d below the vent 102b. A valve box 102 connected to the water pipe 100, a lid 103 having a large air hole 103a for exhausting air facing the vent 102a of the valve box 102, and a valve body 102, A valve body guide 105 disposed in the hollow portion 102c of the box 102; a spherical float valve body 106 disposed inward of the valve body guide 105; And a floating valve body 107 having a small air hole 107 a facing the large air hole 103 a of the lid body 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 nuts 142, 142,. It is fixed to the valve box 102 by 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 element 107 is in close contact with the lower inner lid 103Bb to close the large air hole 103a, and the float valve element 106 is in close contact with the idler valve element 107. In order to close the small air hole 107a, 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. After such a sealed state, when air enters the hollow portion 102c of the valve box 102 through the water pipe 100 and enters the hollow portion 102c, the pressure of the air pool A in the hollow portion 102c of the valve box 102 increases, and the water is retreated. The water level goes down. 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 is separated downward 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 performed urgently or when a failure occurs, and at that time, the air valve 101 is disassembled.

JP 2005-61618 A

However, since the outer lid body 104 is fixed to the valve box 102 using a plurality of lid body fixing bolts 141, 141,..., Each time, using a tool, as shown in FIG. Valve 101 must be disassembled. That is, as shown in FIG. 8 (a), remove the outer cover body 103A from the lid body fixing bolts 141 and 141, a nut from ... 142, 142, remove the., Further, and FIG. 8 (b) , The lid fixing bolts 141, 141,... Are loosened and removed, and the upper inner lid body 103Ba and the lower inner lid body 103Bb are removed. 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 returned to the hollow portion 102c of the valve box 102, and the lower inner lid body 103Bb and the upper inner lid body are returned. 103Ba and the outer lid 103A are attached to the valve box 102 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. Yes and has a valve body that will be connected to the water pipe in the through Mizuguchi, a lid mounted thereto a sky pores facing the vent port of the valve body, the hollow portion of the valve body A valve body guide disposed, 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. And a floating valve body having a small air hole facing the air hole, wherein the valve body guide is formed in a bottomed cylindrical shape, and the hollow portion has an inner surface near its lower side. And a plurality of valve body guide receiving portions are further formed inwardly protruding from the valve body guide receiving portion and the lid body. Will place the inner, the valve body has on its side wall, it can determine whether the air valve is operating normally in observation from the outside, and block the communication between the hollow portion and the water passage pipe In order to reduce the internal pressure accumulated in the hollow part during decomposition, the hole further has a hole that allows the hollow part to communicate with the outside, and the hole rises as the water level in the hollow part rises. floating valve body is in close contact with the lid closing the sky pores, further said rear float valve body Ida busy the small air holes in close contact with the floating valve body, the even lowered the water level float the valve body is not lowered, wherein the accumulated time of the air is not discharged abnormal operation in the small air hole is left is blocked in the hollow portion, the air when communicating with and outside said hollow portion blowing, the float valve body is lowered, the small air hole is not blocked positive In operation, characterized in that it is formed at a position for ejecting the water when communicating with and outside said hollow portion.

The air valve according to claim 2 is the air valve according to claim 1, wherein the lid extends from a lower cylindrical portion that fits into a hollow portion of the valve box, and an outer surface of the lower cylindrical portion. A concave engagement groove is formed on the valve box, and the valve box is provided with a lever having an operation portion on one side and an engagement portion that can be pressed against the engagement groove on the lid on the other side. The lever is configured to be movable, and in the first position, the engaging portion is pressed against the engaging groove of the lid body in the first position, and the engaging portion is separated from the engaging groove of the lid body in the second position. A lever that is detachably attached to the valve box, accommodates the lever in the first position, and is removed before the lever is moved to the second position when the lid is pulled up and removed. A cover is further provided.

According to a third aspect of the present invention, in the pneumatic valve of the second aspect, the lever cover is configured such that when the lever is in the first position, the lever is erroneously moved to the second position by an unexpected external force. It is characterized by preventing becoming .

According to the air valve of the present invention, the valve body guide is disposed between the valve body guide receiving portion and the lid body, and air or water in the hollow portion can be ejected through the hole, so that maintenance can be easily and quickly performed. Assembly and disassembly work including work becomes possible.

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, FIG. 1B is a cross-sectional view (cross-sectional view in front view), and FIGS. 2A and 2B are views of the air valve 1X. 3A and 3B are cross-sectional views illustrating the cover fixing screw 41 and the like, FIGS. 3A and 3B are cross-sectional views illustrating the operation of the air valve 1X, and FIGS. Enlarged partial sectional views for explaining the movement of the float valve body 6 of the air valve 1X, and FIGS. 5A to 5C are sectional views sequentially showing the disassembling procedure of 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 box 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, The valve body guide 5 disposed in the hollow portion 2c of the box 2, the float valve body 6 disposed inside the valve body guide 5, and the inside of the valve body guide 5 above the float valve body 6 And a floating valve body 7 having a small air hole 7 a facing the large air hole 3 a of the lid 3. 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 is provided with a lever 22 on its outer surface, which is rotatably provided with an operating portion 22a on one side and an engaging portion 22b that can be pressed against an engaging groove 3b of a lid 3 described later on the other side. Yes. Specifically, two support shafts 21 and 21 are provided on the outer surface of the valve box 2 in the vicinity of the vent hole 2a, and an intermediate portion between the operating portion 22a and the engaging portion 22b of the lever 22 is rotatable. It is 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. . The lid body receiving portion 2f has an elastic packing ring so that the inner lid portion 3B is fitted from the vent 2a of the valve box 2 and the lower end abuts against the impact, and the adhesion is improved. 23 is fitted.

  Further, the outer surface of the valve box 2 protrudes outward in a bowl shape slightly below the tip of the operation portion 22a when the lever 22 is in the first position (the state in which the lever 22 is tilted), which will be described later. A plurality of (for example, four) lever cover receiving portions 2g, 2g,... With which the lower end surface of the cylindrical lever cover 4 abuts. 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 against the inner side 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. These are parts 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 flange 2j around the water inlet 2b at the lower end, and the flange 2j is joined to the water pipe 100 so that the water inlet 2b communicates with the inside of 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. The lower cylindrical portion 3b extending below the inner lid portion 3B is a hollow portion from the vent 2a of the valve box 2 when the levers 22 and 22 of the valve box 2 are in the second position (the levers 22 and 22 are raised). It fits into 2c, and its lower end comes into contact with the lid receiving portion 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. The outer lid portion 3A 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. The air in the hollow portion 2c of the valve box 2 flows out through the large air hole 3a and 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 where the levers 22 and 22 are raised), the engaging portions 22b and 22b are separated from the engaging grooves 3c to release the pressure contact state, and the lid The body 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 the lever cover 4 is attached to the valve box 2, the screw 41 is passed through the cover fixing hole 4a of the lever cover 4 and screwed into the screw hole 2h of the valve box 2, as shown in FIG. 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. Further, a small hole 7c for passing air is formed between the outer peripheral surface of the idle valve element 7 and the recess 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, when the cock 24 is opened and water enters the hollow portion 2c of the valve box 2 from the water conduit 100, the air in the hollow portion 2c of the valve box 2 is rapidly exhausted from the large air hole 3a by the water pressure. The 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. 3 (a), the floating valve body 7 comes into close contact with the upper surface of the inner lid portion 3B to close the large air hole 3a, and the float valve body 6 comes into close contact with the floating valve body 7 to reduce its small size. In order to close the air hole 7a, the hollow portion 2c of the valve box 2 has an air reservoir A and a water reservoir W up and down, and 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. . And again, the water level rises 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 experiment by the present inventor, a curved surface with a radius of curvature up to 1 to 3 times the height (height) L of the float valve body 6 is desirable, and the air valve 1X operates without problems even when tilted 30 degrees from the vertical direction. Has been confirmed. 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 to block communication between the water pipe 100 and the hollow portion 2c of the valve box 2 so that water does not flow in during operation.

Next, the screw 41 of the cover fixing screw 41 is loosened and removed. At this time, normally, water is ejected from the screw hole 2h of the valve box 2, but the normal operation of the air valve 1X can be confirmed by the water pressure. Temporarily, the floating valve body 7 and the float valve body 6 were fixed, and even when the water level dropped, the float valve body 6 did not descend and the small air holes 7a remained blocked and air was not discharged. In some cases, air will erupt. 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 103Bb of the air valve 101 of FIG. 6 described in the background art section . Therefore, 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. Further, Rukoto to the air valve 1X type no cock 24 are readily possible.

1X Air Valve 2 Valve Box 2a Valve Box Vent 2b Valve Box Water Flow Port 2c Valve Box Hollow 2d Valve Box Water Conveying Portion 2g 'Cover Fixing Portion 2h Valve Box Screw Hole 22 Lever 22a Lever Operation Unit 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 (3)

Vents the upper end, has a passage Mizuguchi the lower end, the hollow portion below the inside of the vent, and have a water conduit thereunder, said communication valve box that will be connected to the water pipe at Minakuchi A lid having a large air hole facing the vent of the valve box, and a valve body guide disposed in a hollow portion of the valve box, and disposed inside the valve body guide. An air comprising: a float valve body that is formed, and a floating valve body that is disposed inwardly of the valve body guide and above the float valve body and has a small air hole facing the large air hole of the lid body In the valve
The valve body guide is formed in a bottomed cylindrical shape, and a plurality of valve body guide receiving portions are further formed in the hollow portion by partially projecting the inner surface near the lower part thereof inward. The valve body guide is disposed between the valve body guide receiving portion and the lid body,
The valve box can be determined by observing from the outside whether or not the air valve is operating normally on the side wall, and when the hollow is disassembled while blocking the communication between the water pipe and the hollow portion. In order to reduce the internal pressure accumulated in the part, it further has a hole through which the hollow part can communicate with the outside,
Said bore, said floating valve body is in close contact with the lid closing the sky pores, further the small air the float valve body is in close contact with the floating valve element to increase with increasing water level in the hollow portion after the holes infarction Ida, the water level is the not float valve body is lowered even down, the during abnormal operation of air accumulated is not discharged as a left small air hole is blocked in the hollow portion the air ejected when communicating with and outside said hollow portion, the float valve body is lowered, the during normal operation of the small air hole is not blocked, the time of communicating with and outside said hollow portion air valve, characterized in that it is formed in a position for ejecting water. The air valve according to claim 1,
The lid is formed by extending a lower cylindrical portion that fits into a hollow portion of the valve box, and forming a concave engagement groove on an outer surface of the lower cylindrical portion,
The valve box is rotatably provided with a lever having an operating portion on one side and an engaging portion that can be pressed against the engaging groove of the lid on the other side,
In the lever, the engaging portion is pressed against the engaging groove of the lid body at the first position, and the engaging portion is separated from the engaging groove of the lid body at the second position,
A lever cover that is detachably attached to the valve box and that houses the lever in the first position and is removed before the lever is moved to the second position when the lid is pulled up and removed. An air valve characterized by The air valve according to claim 2,
The air valve according to claim 1, wherein the lever cover prevents the lever from being accidentally brought into the second position by an unexpected external force when the lever is in the first position.

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