JP2005061618A - Air valve and hydrant therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air valve and a hydrant with the air valve in which the production costs can be reduced, and the work can be simply carried out, at low costs. <P>SOLUTION: The air valve 1 is provided with a cylindrical casing 4 in the erected posture in which a ventilation hole 3 is opened at an upper end 2, a pillar-shaped float needle valve 5 which is long in the vertical direction and movably inserted up and down in the cylindrical casing 4, and a valve seat 6 which is installed around the ventilation hole 3 in the cylindrical casing 4 and makes the pillar-shaped float needle valve 5 rising with the buoyancy from water supply in close contact. The hydrant 8 with the air valve is equipped with the air valve 1 at the side of the valve housing 13. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a general-purpose air valve that exhausts air bubbles, air, or other gas (hereinafter referred to as “air” or the like) accumulated inside or near a water pipe to the outside of the pipe, and such It relates to a fire hydrant fitted with an air valve.

  As shown in FIG. 9, a conventional air valve 101 is known in which a lightweight valve body 105 that covers the upper side of a spherical float valve 104 is placed in a casing 103 having an exhaust port 102 in the upper part thereof. . A packing material 106 that can be in close contact with the spherical float valve 104 is provided on the lower surface of the valve body 105. The valve body 105 and the packing material 106 form a vent hole 107 that penetrates each of the valve body 105 and the packing material 106. A joint flange 108 that is joined to a water pipe (not shown) is provided on the lower periphery of the casing 103.

  When the water supply is introduced into the casing 103 from the water pipe, the air staying in the casing 103 is rapidly exhausted from the exhaust port 102 due to the water pressure. At the same time, the valve body 105 floats together with the spherical float valve 104 in the water supply. As a result, as shown in FIG. 10, the valve body 105 is in close contact with the upper portion of the casing 103 to close the exhaust port 102, and the spherical float valve 104 closes the vent hole 107, so that the inside of the casing 103 is completely sealed. .

  In this state, when air or the like enters the casing 103 from the water pipe into the casing 103 and enters a cavity in the upper portion of the casing 103, the spherical float valve 104 is lowered accordingly. On the other hand, since a predetermined internal pressure (water pressure or atmospheric pressure) is applied to the casing 103, the valve body 105 remains pushed up by the internal pressure.

  Therefore, although the exhaust port 102 of the casing 103 continues to be blocked by the valve body 105, the air or the like in the casing 103 passes through the gap between the spherical float valve 104 and the valve body 105, and further through the vent hole 107, and then the casing. 103 is discharged outward. When the air valve 101 is cleaned, the inside of the casing 103 and the water pipe can be shut off by the on-off valve 109 provided on the upper side of the joint flange 108.

Other techniques relating to the air valve are disclosed in the following patent documents.
JP 2001-254404 A

  In order to fit the conventional air valve 101 into a water pipe buried underground or a water pipe piped inside a bridge or the like, it is an inevitable problem to reduce the size of the air valve 101. In order to satisfy such a request from the construction site, it is first necessary to reduce the size of the spherical float valve 104 and the valve body 105. However, the volume of the spherical float valve 104 and the valve body 105 is set so as to be a predetermined weight in consideration of responsiveness to water pressure in addition to ensuring a specific gravity that allows the buoyancy to float with a predetermined buoyancy during water supply. Yes. Therefore, the spherical float valve 104 and the valve body 105 cannot be simply reduced. This point prevents the air valve 101 from being downsized.

  In addition, since the water pressure is set to a value unique to various water pipes, by changing the shape and dimensions of the spherical float valve 104 and the valve body 105 in correspondence with the water pressure value, It is necessary to increase or decrease the weight or specific gravity. However, since it is necessary to change the inner diameter of the casing 103 in accordance with such a change in shape and size, the spherical float valve 104, the valve body 105, and the casing 103 are used to manufacture or install the air valve 101. A large number must be prepared for each weight, specific gravity, or size. Therefore, there is a problem that the manufacturing cost of the air valve 101 or the labor required for its construction increases unnecessarily.

  An object of the present invention is to achieve reduction in manufacturing cost and simplification of construction in addition to miniaturization of the air valve itself and miniaturization of a fire hydrant to which the air valve is attached.

  An air valve according to the present invention includes a cylindrical casing in an upright posture in which water is introduced into the interior and a vent hole is opened at the upper end, and a columnar float valve that is vertically inserted into the cylindrical casing so as to be movable up and down. And a valve seat that is provided around the vent hole in the cylindrical casing and closely contacts the columnar float valve that is lifted by receiving buoyancy from the water supply.

  Furthermore, the air valve according to the present invention is characterized in that the buoyancy that the columnar float valve receives from the water supply can be adjusted by increasing or decreasing the weight or specific gravity of the columnar float valve.

  Furthermore, the air valve according to the present invention includes an exhaust path provided outside the cylindrical casing, one of the exhaust paths is connected to the vent hole, and the other of the exhaust paths is connected to the upper end of the cylindrical casing. It is characterized by opening to a lower position.

  Further, the fire hydrant with an air valve according to the present invention has a water supply port provided with a joint flange that can be joined to the water pipe at the periphery, and a water discharge port through which the water supplied from the water pipe can be discharged via the water supply port A housing, an on-off valve that is built in the valve housing and opens and closes the water supply port, a cylindrical casing that is disposed above the joint flange in an upright position with a vent hole open at an upper end, and the cylindrical shape from the valve housing A communication passage for introducing water supply into the casing, a columnar float valve that is vertically inserted into the cylindrical casing so as to be movable up and down, and the water supply provided around the vent hole in the cylindrical casing And a valve seat that closely contacts the columnar float valve that is lifted by receiving buoyancy.

  Since the columnar float valve constituting the air valve according to the present invention has an elongated shape in the vertical direction, the overall width dimension of the air valve including the cylindrical casing into which the columnar float valve is inserted can be suppressed. In addition, compared with the conventional technology, the valve body intended to exhaust air etc. rapidly is omitted, so the height dimension of the air valve is also suppressed by the space occupied by this valve body. It is done. Therefore, the air valve can be significantly reduced in size, and the air valve can be fitted in a water pipe buried underground or a water pipe piped inside a bridge or the like. Furthermore, with the miniaturization of the air valve, for example, when it is attached to a fire hydrant, the entire fire hydrant with such an air valve can be further miniaturized.

  Furthermore, according to the air valve of the present invention, when water is introduced into an upright cylindrical casing and the inside of the cylindrical casing is filled with the water, the columnar float valve is lifted by receiving buoyancy from the water supply. Adhere to the seat. As a result, the air hole is closed, and the cylindrical casing is completely sealed. In this state, when air or the like is mixed with the water supply and enters the cylindrical casing, the water supply in the cylindrical casing is retreated accordingly, and the water level in the cylindrical casing is lowered.

  Since the columnar float valve also descends as the water level falls, the columnar float valve deviates downward from the valve seat. Since the water pressure in the cylindrical casing is set to be higher than the atmospheric pressure, the air is guided by this water pressure, and the air passes through the air gap between the columnar float valve and the valve body, and further through the vent hole. Exhausted to the outside. When all the air and the like are exhausted to the outside of the cylindrical casing, the water level in the cylindrical casing is restored, so that the cylindrical casing is again filled with water supply.

  The above operation can be appropriately performed only by changing the weight or specific gravity of the columnar float valve according to the level of water pressure expected to be applied in the cylindrical casing. The weight or specific gravity of the columnar float valve is determined by, for example, the overall length of the columnar float valve in the vertical direction or the ratio of the hollow portion in the columnar float valve. By simply changing the shape or by forming a hollow portion in the columnar float valve, it is possible to quickly and easily make a specification change corresponding to any water pressure.

  Therefore, according to the air valve, the main components of the air valve other than the columnar float valve, in particular the cylindrical casing, correspond to the inherent water pressure set for each water pipe as in the past. It is possible to save the trouble of making such a metal product or preparing a large number for each of various specifications (dimensions). Thereby, the manufacturing cost which concerns on the said air valve, or the effort which the construction requires can be reduced significantly.

  Furthermore, according to the air valve of the present invention, one of the exhaust passages provided outside the cylindrical casing is connected to the vent hole, so that air exhausted from the vent hole to the outside of the cylindrical casing, All flows into the exhaust path, passes through the exhaust path, and reaches the other side of the exhaust path. Since the other of the exhaust passages is open at a position lower than the upper end of the cylindrical casing, air or the like is exhausted from the other of the exhaust passages to the atmosphere, but rain water or the like passes through the other of the exhaust passages. Regressing toward the pores is prevented.

  Therefore, when the air valve is attached to a water pipe, for example, and buried in the basement together with the water pipe, it is possible to prevent rainwater or the like from entering the vicinity of the vent hole. In addition, troubles such as clogging of the air vents due to dust mixed with rainwater can be prevented.

  Further, according to the fire hydrant with an air valve according to the present invention, regardless of the open / close state of the on-off valve built in the valve housing, the inside of the cylindrical casing passes through the communication passage from the water supply port of the valve housing to the inside of the cylindrical casing. Water supply can be introduced in Moreover, since the place where the fire hydrant with the air valve is actually installed is the end (upper end) of the water pipe extending in the vertical direction, the air accumulated in the water pipe passes through the communication path and enters the cylindrical casing. It reaches. Thereby, the columnar float valve inserted in the cylindrical casing performs the operation described above. Therefore, the fire hydrant with an air valve can always exhaust the air and the like from the vent hole to achieve the above-described effect.

  And if a water supply port is a position higher than the location opened and closed by an on-off valve, a cylindrical casing can be freely arrange | positioned anywhere in a valve housing. Therefore, if the cylindrical casing is disposed close to the side surface of the valve housing, the overall height of the fire hydrant with the air valve can be greatly suppressed. Moreover, in this case, since the communication path from the lower end of the cylindrical casing to the water supply port can be minimized, the entire fire hydrant with the air valve can be further reduced in size.

  An air valve and a fire hydrant with an air valve according to an embodiment of the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, the air valve 1 has a cylindrical casing 4 in an upright posture with a vent hole 3 opened at an upper end 2 thereof, and is elongated in the vertical direction inserted into the cylindrical casing 4 so as to be movable up and down. A columnar float valve 5 and a valve seat 6 that is provided around the vent hole 3 inside the cylindrical casing 4 and that closely contacts the columnar float valve 5 that floats on water not shown in the drawing are provided.

  The cylindrical casing 4 includes a cylinder 41 that introduces water into the inside thereof through an end port of the lower end 40, an end block 43 that closes the end port of the upper end 42 of the cylinder 41, and an upper end 42 of the cylinder 41 that is joined to the end block 43. An end cap 44 is provided to cover the peripheral surface and the upper surface. For example, while the internal thread is formed on the inner peripheral surface near the upper end 42 of the cylinder 41 and the external thread formed on the outer peripheral surface of the end block 43 is fastened to the internal thread, the cylinder 41 and the end block 43 are joined. good. In addition, a male screw is formed on the outer peripheral surface in the vicinity of the upper end 42 of the cylinder 41, and the cylinder 41 and the end cap 44 are joined by tightening a female screw formed on the inner peripheral surface of the end cap 44 to the male screw. good.

  As described above, it is desirable that the cylinder 41, the end block 43, and the end cap 44 be joined to each other so that the columnar float valve 5 can be easily replaced. In particular, if the end cap 44 can be attached / detached by simply rotating the end cap 44 with respect to the cylinder 41, a plurality of bolts (not shown) that penetrate the lid covering the exhaust port as in the conventional example shown in FIG. The labor of tightening can be saved by one representative).

  A plurality of members to be described below are joined firmly by welding or adhesion in addition to the mechanical screwing as described above. The description regarding the joint location of each member is abbreviate | omitted.

  A valve seat 6 is formed on the lower surface of the end block 43. The end cap 44 has an open lower surface, and further has an exhaust port 45 formed at an appropriate position on the peripheral surface. A gap is secured between the peripheral surface and the upper surface of the end block 43 and the inner surface of the end cap 44. This gap serves as an exhaust path 7 provided outside the cylindrical casing 4. The valve seat 6 is a spherical recess, and faces the upper end 51 of the columnar float valve 5 that is a convex spherical surface. An opening 60 is provided at the center of the valve seat 6, and a substantially conical packing material 30 is fitted into the opening 60. A ventilation hole 3 is formed through the center of the packing material 30. The arrangement of the vent holes 3 corresponds to the apex of the upper end 51 of the columnar float valve 5. The lower end of the packing material 30 protrudes slightly downward from the valve seat 6, and can reliably adhere to the upper end 51 of the columnar float valve 5.

  As the columnar float valve 5, a long shape extending in the vertical direction, specifically, a shape in which the overall length corresponding to the vertical direction in the figure is larger than the width dimension corresponding to the horizontal direction in the figure is applied. Yes. This is because the columnar float valve 5 is prevented from being inverted or tilted inside the cylindrical casing 4 to obtain the advantage that the upper end 51 of the columnar float valve 5 can always be directed to the valve seat 6. is there. This advantage is the same even if the total length in the vertical direction of the columnar float valve 5 is shortened or extended from the illustrated dimensions. As the material of the columnar float valve 5, for example, a material having a specific gravity smaller than that of water, such as a synthetic foamed resin, and that does not cause corrosion even when immersed in water for many years is desirable.

  FIG. 2 shows a form in which the cylinder 41 of the cylindrical casing 4 is connected to the water diversion column 47 through the joint pipe 46 as an example of use of the air valve 1. In this case, a male screw is formed on the outer peripheral surface in the vicinity of the lower end 40 of the cylinder 41, and a cylinder 41 and the joint tube 46 are joined by tightening a female screw formed on the inner peripheral surface of the joint tube 46 to the male screw. Also good. Further, a male thread is formed on the outer peripheral surface in the vicinity of the upper end 48 of the water diversion column 47, and the joint pipe 46 and the water diversion column 47 are joined by tightening a female thread formed on the inner peripheral surface of the joint pipe 46 to the male screw. May be.

  The diversion column 47 can introduce tap water into the inside thereof through the end of the lower end 49. Further, the tap water is introduced into the cylinder 41 from the inside of the diversion column 47 through the joint pipe 46 as described above. Such tap water is referred to as “water supply” below. Two states of the columnar float valve 5 are shown with a one-dot chain line CL as a boundary. That is, the right side of the alternate long and short dash line CL is a state in which the columnar float valve 5 that has been lifted by receiving buoyancy from water supply has its upper end 51 in close contact with the lower end of the packing material 30. The left side of the alternate long and short dash line CL is a state where the columnar float valve 5 is lowered as the water level inside the cylindrical casing 4 is lowered. The raising and lowering of the columnar float valve 5 will be described in detail later.

  FIG. 3 shows a modified example of the air valve 1. The end block 43 is inserted into the cylinder 41 so as to be in sliding contact with the cylinder 41. A pressure coil spring 71 is sandwiched between the end block 43 and the end cap 44. The latching stop 72 is configured to hold the end block 43 at a height near the upper end 42 of the cylinder 41. The pressure coil spring 71 has a damper effect for preventing the packing material 30 from being crushed and preventing other members from being damaged when the water supply freezes and expands in winter or the like.

  Further, as apparent from a comparison between FIG. 2 and FIG. 3, the packing material 30 may be directly pressed by the end cap 44 so that the end block 43 does not float from the upper end 42 of the cylinder 41. As described above, when the end cap 44 is tightened near the upper end 42 of the cylinder 41, in other words, when the distance between the end block 43 and the end cap 44 slightly increases or decreases, the end block 43 is pressed by the packing material 30. The strength that is changed. Therefore, if the pressure coil spring 71 can be expanded and contracted as much as the distance between the end block 43 and the end cap 44 increases or decreases, the strength with which the end block 43 is pressed becomes constant regardless of the above-mentioned tightening.

  Constituent elements substantially the same as those already described in the first embodiment are denoted by the same reference numerals below, and detailed description or illustration thereof is omitted.

  FIG. 4 illustrates the fire hydrant 8 to which the air valve 1 is attached. Such a fire hydrant 8 with an air valve includes a valve housing 13 having a water supply port 10 provided with a joint flange 9 on the periphery and a water discharge port 12 through which the water supplied to the inner chamber 11 through the water supply port 10 can be discharged, An on-off valve 14 that is built in the housing 13 and opens and closes the water supply port 10, the above-described cylindrical casing 4 that is disposed above the joint flange 9 in an upright posture, and the cylindrical casing 4 from the water supply port 10 of the valve housing 13. The communication passage 15 that penetrates the joint flange 9 so as to reach the lower end 40, the columnar float valve 5 described above, and the valve seat 6 are provided.

  The joint flange 9 is a part that is located on the lower side in the drawing and is joined to a water pipe that is not shown in the drawing. This water pipe is a place where the fire hydrant 8 with an air valve is actually installed. Specifically, the water pipe extending in the vertical direction or the end (upper end) of the branch pipe branching upward from the horizontally extending water pipe. Means. The water supply port 10 is open to the bottom of the valve housing 13. The water discharge port 12 is a pipe line extending upward from the side surface of the valve housing 13, and a cap 16 is detachably attached to the terminal.

  Two states of the on-off valve 14 are shown with a one-dot chain line CL in FIG. 4 as a boundary. That is, when the upper end 18 of the spindle 17 protruding from the upper surface of the valve housing 13 is rotated using a spanner or the like in the direction in which the upper end 18 of the spindle 17 is tightened to the nut 19, The valve body 20 is in close contact with the bottom of the valve housing 13 to close the water supply port 10. This state is shown on the right side of the alternate long and short dash line CL. On the contrary, when the upper end 18 of the spindle 17 is rotated in the loosening direction, the valve body 20 is separated from the bottom of the valve housing 13 upward to open the water supply port 10. This state is shown on the left side of the alternate long and short dash line CL.

  The operation of the air valve 1 and the fire hydrant 8 with the air valve detailed above will be described with reference to FIG. That is, regardless of the open / close state of the on-off valve 14, water supply is always introduced into the cylindrical casing 4 through the water supply port 10 and the communication passage 15. When the columnar float valve 5 is lifted by receiving buoyancy from the water supply while the inside of the cylindrical casing 4 is filled with water supply, the upper end 51 of the columnar float valve 5 is in close contact with the entire valve seat 6 including the packing material 30. To do. As a result, the vent hole 3 is closed, and the inside of the cylindrical casing 4 is completely sealed. In this state, when air or the like is mixed with the water supply and enters the inside of the cylindrical casing 4, the water supply inside the cylindrical casing 4 is retreated accordingly, and the water level inside the cylindrical casing 4 is lowered.

  As the water level falls, the columnar float valve 5 also descends, so that the columnar float valve 5 deviates downward from the valve seat 6. This state is shown in FIG. Usually, since the water pressure inside the cylindrical casing 4 is set higher than the atmospheric pressure, the air or the like is inferred by this water pressure so that the air or the like is a gap between the columnar float valve 5 and the valve seat 6, or a vent hole. 3 is exhausted to the outside of the cylindrical casing 4, and all of it reaches one of the exhaust passages 7, that is, directly above the vent hole 3 in the drawing. Further, air or the like flows to the other side (left side in the drawing) along the exhaust path 7 and is discharged from the exhaust port 45 of the end cap 44 to the atmosphere.

  As shown in the figure, since the exhaust port 45 is opened at a position lower than the upper end 2 of the cylindrical casing 4, air or the like is exhausted well from the other side of the exhaust path 7, but rainwater or the like is discharged from the other side of the exhaust path 7. It is possible to prevent the retrograde from going to the vent hole 3. When all the air and the like are exhausted to the outside of the cylindrical casing 4, the water level inside the cylindrical casing 4 is restored, and again the inside of the cylindrical casing 4 is filled with water supply.

  The above operation can be appropriately performed only by changing the weight of the columnar float valve 5 according to the level of the water pressure inside the cylindrical casing 4. Since the weight of the columnar float valve 5 is determined by the length of the entire length in the vertical direction, for example, at a construction site or a manufacturing factory, only the columnar float valve 5 is changed to a desired length so that it can cope with any water pressure. Specification changes can be made quickly and easily. Alternatively, the weight of the columnar float valve 5 is determined by the ratio of the hollow portion 50 to the columnar float valve 5 as shown in FIG. When the hollow part 50 opened only downward as shown in the figure is filled with air or the like to become an air reservoir, the columnar float valve 5 has a lower specific gravity as a whole including the air reservoir. For this reason, the specific gravity of the columnar float valve 5 can be adjusted only by changing the dimension of the hollow part 50 formed in the columnar float valve 5 at, for example, a construction site or a manufacturing factory, and the above-described specification change can be performed quickly and easily.

  Accordingly, the main components of the air valve 1 other than the columnar float valve 5, particularly metal products such as the cylindrical casing 4, are remodeled corresponding to the specific water pressure set for each type of water pipe. There is an advantage that it is possible to save the trouble of preparing a large number of main components for various specifications.

  The above-mentioned “change in length” means that several types of columnar float valves 5 having different lengths are prepared in advance, and one columnar float valve 5 selected from these is inserted into the cylindrical casing 4. is there. In addition, the columnar float valve 5 may be cut to shorten the entire length, or, as shown in FIG. 6, a plurality of columnar float valves 5 may be stacked vertically to increase the total length. Furthermore, as shown in the figure, a plurality of pieces of the cylindrical casing 4 may be detachably joined to each other so that the total length of the cylindrical casing 4 can be increased or decreased according to the total length of the columnar float valve 5.

  As described above, the columnar float valve 5 has an elongated shape in the vertical direction, so that the overall width dimension of the air valve 1 including the cylindrical casing 4 into which the columnar float valve 5 is inserted is suppressed. The overall width of the valve-equipped hydrant 8 can also be suppressed. In addition, since the valve body intended to exhaust air or the like rapidly is omitted as compared with the prior art, the height dimension of the air valve 1 can be suppressed as much as the valve body is omitted. Therefore, in addition to achieving a significant downsizing of the air valve 1, it is possible to reduce the overall size of the fire hydrant 8 with an air valve.

  Further, the cylindrical casing 4 can be freely disposed anywhere with respect to the valve housing 13 as long as the water supply port 10 is at a position higher than the position where the water supply port 10 is opened and closed by the on-off valve 14. Therefore, as illustrated in FIG. 4, if the cylindrical casing 4 is disposed close to the side surface of the valve housing 13, the overall height of the fire hydrant 8 with the air valve can be significantly suppressed. In addition, in this case, since the communication path 15 extending from the lower end 40 of the cylindrical casing 4 to the water supply port 10 can be minimized, the entire fire hydrant 8 with an air valve can be further downsized.

  It should be noted that the present invention can be implemented in a mode in which various improvements, modifications, and variations are added based on the knowledge of those skilled in the art without departing from the spirit of the present invention. For example, the ball valve indicated by reference numeral 70 in FIG. 7 allows the discharge of air or the like in the cylindrical casing 4, but the pressure in the pipe line is equal to or negative from the atmospheric pressure due to circumstances such as water shutoff work. When it turns to pressure, it acts as a check valve, and can prevent dust, rainwater, etc. in the atmosphere from going backward in the exhaust passage 7. Such a ball valve 70 may be provided in the end cap 44 shown in FIGS. Moreover, as shown in FIG. 7, the exhaust path 7 may be a pipe. The figure shows a form in which one end of the exhaust passage 7 is connected to the vent hole 3 and the other end of the exhaust passage 7 is directed to a position lower than the upper end 2 of the cylindrical casing 4.

  Alternatively, the ball valve 70 is omitted, and as shown in FIG. 8, the valve body 52 made of an O-ring is fixed near the lower end of the columnar float valve 5, while the role of a mortar-shaped valve seat is provided at the lower end 40 of the cylinder 41. A seal block 53 that fulfills the above may be connected.

  In this case, as shown on the right side of the alternate long and short dash line CL in the drawing, the water supply is allowed to pass through the lower end 40 of the cylinder 41 in a state where the columnar float valve 5 is lifted by receiving buoyancy from the water supply. As shown on the left side of the alternate long and short dash line CL, the valve body 52 comes into close contact with the seal block 53 in a state where air or the like enters the cylinder 41 and the columnar float valve 5 is lowered as the water supply level drops. become. Thereby, since the gap between the cylinder 41 and the communication path 15 is blocked, it is possible to prevent air or the like from entering the communication path 15 into the cylinder 41.

  The present invention can prevent rust of a water pipe by exhausting air or the like accumulated in a pipe line in or near the water pipe. Furthermore, it is possible to prevent the rust in the T-shaped tube for installing the fire hydrant and the danger that the water or the like rapidly expands and the water supply blows out immediately after the fire hydrant is opened. Furthermore, since a fire hydrant and its associated equipment can be reduced in size, space saving can be realized when installing a fire hydrant on a building or road.

Sectional drawing of the air valve which concerns on embodiment of this invention. Sectional drawing which shows the usage example of the air valve which concerns on embodiment of this invention. Sectional drawing which shows the modification of the principal part of the air valve which concerns on embodiment of this invention. The side view which fractured the fire hydrant with an air valve concerning an embodiment of the invention. The side view which fractured | ruptured the principal part of the fire hydrant with an air valve which concerns on embodiment of this invention. Sectional drawing which shows the 1st modification of the air valve which concerns on embodiment of this invention. Sectional drawing which shows the 2nd modification of the air valve which concerns on embodiment of this invention. The side view which fractured | ruptured the principal part of the 3rd modification of the air valve which concerns on embodiment of this invention. Sectional drawing of the air valve of a prior art example. Sectional drawing which shows the operation example of the air valve of a prior art example.

Explanation of symbols

1: Air valve 2: Upper end 3: Vent hole 4: Cylindrical casing 5: Column-shaped float valve 6: Valve seat 7: Exhaust passage 8: Fire hydrant with air valve 9: Joint flange 10: Water supply port 11: Inner chamber 12: Release Water port 13: Valve housing 14: On-off valve 15: Communication path

Claims (4)

A cylindrical casing in an upright position in which water is introduced into the interior and a vent hole is opened at the upper end, a vertically long columnar float valve inserted in the cylindrical casing so as to be movable up and down, and a cylindrical casing in the cylindrical casing. An air valve, comprising: a valve seat provided around the vent hole and in close contact with the columnar float valve that is lifted by receiving buoyancy from the water supply. The air valve according to claim 1, wherein the buoyancy that the columnar float valve receives from the water supply can be adjusted by increasing or decreasing the weight or specific gravity of the columnar float valve. An exhaust path provided outside the cylindrical casing is provided, one of the exhaust paths is connected to the vent hole, and the other of the exhaust paths is opened at a position lower than the upper end of the cylindrical casing. The air valve according to claim 1 or 2. A valve housing having a water supply port provided at the periphery with a joint flange that can be joined to the water pipe, and a water discharge port through which the water supplied from the water pipe can be discharged via the water supply port, and the water supply port built in the valve housing An on-off valve that opens and closes, a cylindrical casing that is disposed on the upper side of the joint flange in an upright position with a vent hole at the upper end, a communication passage that introduces water supply from the valve housing into the cylindrical casing, A vertically extending columnar float valve inserted in the cylindrical casing so as to be movable up and down; and the columnar float valve provided around the vent hole in the cylindrical casing and receiving buoyancy from the water supply A fire hydrant with an air valve, characterized by comprising a valve seat for close contact.

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