JP6817019B2 - Non-freezing air valve - Google Patents

Description

The present invention mainly relates to an air valve that is connected to a water main and discharges air in the pipe, and more particularly to an antifreeze type air valve that can prevent internal freezing.

In pipelines such as water mains, air bubbles and air pools may reduce the effective cross-sectional area of the piping and reduce the pipeline capacity. To prevent this, air is discharged from the piping. Valves are commonly installed. The air valve is usually installed in a pipe, buried underground, or in a pipeline laid in an aqueduct via a T-shaped pipe. In this case, especially in a low temperature such as a cold region, the inside may freeze and its function may not be exhibited. Therefore, as a countermeasure, it is called a non-freezing type air valve provided so as to prevent the inside from freezing. Air valves are often used.

Generally, in the non-freezing type air valve, a sleeve member is inserted in a tubular body forming a valve box, a float valve body is housed inside the sleeve member, and a floating valve body is housed in the upper part of the float valve body. A lid having a large air hole is attached to the upper part of the structure. Then, it is connected to the T-shaped pipe in a state where the inside is exposed in the vicinity of the water main, and the freezing inside is prevented by utilizing the running water energy from the pipe.

As a result, in this type of air valve, repair work such as internal inspection and cleaning is performed by blocking the flow path with the water main without requiring a repair valve such as a ball valve between the air valve and the main. It has a structure that allows. When repairing this air valve, after removing the cover covering the upper part, loosen the bolt fixing the sleeve member and raise the sleeve member by water pressure, and this rise causes the intake / exhaust communication holes provided in the body. By closing the valve chamber, the water can be stopped. Then, the fixing bolt holding the lid body is removed, the lid body is removed, the floating valve body and the float valve body are removed, and the repair work is carried out.

On the other hand, in the air valve of Patent Document 1, when cleaning the inside, after loosening the fixing bolt and removing the cover, loosen and remove the guide fixing bolt fixing the float valve body guide, and also remove the bolt with a hole. A pair of tightening members made of the above are uniformly tightened to push down the float valve body guide, and the cushioning body at the lower part of the float valve body is pressed against the valve box to close the through hole at the bottom of the valve box to stop water. It is possible. In this state, the bolt for fixing the inner lid member is loosened, the inner lid member is removed, and the float valve body and the floating valve body are removed for repair.

In the antifreeze type air valve of Patent Document 2, a bottomed cylindrical valve box for accommodating a float, a bottomed outer cylinder forming a gap between the outer peripheral surface of the valve box, and an upper portion of the valve box. It has a valve body that covers the opening, and the valve box can be moved up and down by screwing a flange to the outer cylinder. When cleaning the air valve, the valve box is lowered by screwing, so that the opening of the outer cylinder is closed with the sealing material attached to the bottom surface of the valve box to shut off from the fluid flow path. There is.

Japanese Patent No. 4583288 Japanese Patent No. 3919284

Among the non-freezing type air valves described above, in the air valve having a structure in which the fixing bolt is loosened and the sleeve member is raised by the force of water pressure to stop the water in the valve chamber, the fixing bolt is used when the water pressure in the water main is low. When loosening, the sleeve member cannot be raised and the communication hole may not be closed. In this case, it becomes necessary to raise the sleeve member with respect to the body by tightening another bolt, which complicates the work.

In the air valve of Patent Document 1, the guide fixing bolt is loosened to release the fixing of the float valve body guide, and then the tightening member is tightened to push down the float valve body guide. Therefore, the operation is complicated by these plurality of types of bolts, it takes time and effort to repair the float valve body and the floating valve body, and a large operation space for operating a plurality of types of parts is also required.

The antifreeze type air valve of Patent Document 2 has a structure in which the entire valve box is moved up and down with respect to the outer cylinder via screwing of a flange to close the outer cylinder opening, so that the valve box can be rotated. A special tool is required, and as this tool becomes larger, workability also deteriorates. Moreover, since the sealing packing is mounted between the valve box and the outer cylinder, the sliding resistance increases when the valve box rotates, and the force for moving the valve box up and down increases. Further, the load on the packing is increased, and the packing may be damaged and the sealing property cannot be ensured.

The present invention has been developed in order to solve the above-mentioned problems, and an object of the present invention is an air valve that prevents internal freezing, and easily and surely connects to an external pipe with a simple operation. It is an object of the present invention to provide a non-freezing type air valve which can cut off a flow path to carry out repair work and secure internal sealing performance.

In order to achieve the above object, in the invention according to claim 1, a sleeve portion containing a floating valve body and a float valve body is mounted in a valve box portion so as to be vertically movable so that a flow path with an external pipe can be cut off. A non-freezing type air valve provided, in which a bolt member is erected on a flange provided on the upper end side of the valve box portion, and the sleeve portion is non-rotated with respect to the valve box portion in a screwed state to the bolt member. state forcibly increased or lowered, the Rutotomoni openable and closable flow path between the external pipe in closed or open communicating portion provided respectively on the sleeve part and the valve body portion to each other, the upper end of the sleeve portion It is a non-freezing type air valve that is detachably attached by rotating it with a lid having a large air hole embedded in the opening .

According to the second aspect of the present invention, a nut member screwed into a bolt member is rotatably attached to a flange portion provided at the upper end of the sleeve portion in a position-controlled state, and the sleeve portion is moved up and down via the flange portion. It is a non-freezing type air valve.

The invention according to claim 3, screwed to the bolt member from the bottom side of the flange, which is not frozen type air valve housing a bolt head of the bolt member in a concave accommodation portion formed in the flange.

According to the fourth aspect of the present invention, the length of the bolt member is such that the upper surface of the nut member and the screw tip of the bolt member are substantially the same height in a closed state of the communicating portion between the sleeve portion and the valve box portion. It is a non-freezing type air valve set to.

The invention according to claim 5 is a non-freezing type air valve in which a cover portion that covers the valve box portion and the sleeve portion from above is fixed to the tip end side of the bolt member.

In the invention according to claim 6, an appropriate number of O-rings that closely seal the inner circumference of the valve box portion are attached to the outer circumference of the sleeve constituting the sleeve portion, and the periphery of the communication portion in the open state is sealed by the O-rings. It is a frozen air valve.

The invention according to claim 7 is a non-freezing type air valve in which a flange portion is divided into upper and lower portions and a nut member is mounted between the upper and lower flange portions in an engaged state.

According to the invention of claim 1, the sleeve portion is raised or lowered non-rotatingly along the bolt member in a screwed state with the bolt member erected on the valve box portion to force the valve box portion. By providing the communication part between the sleeve part and the valve box part so that the flow path with the external pipe can be opened and closed while the sleeve part and the valve box part are mutually closed or opened, the water pressure is used while making the operation space compact. The bolt member can be rotated manually without any need to move the sleeve part up and down with respect to the valve box part via screwing, and the flow path to the external piping can be easily cut off with a simple operation without making a mistake in the operation procedure. Then, repair work such as internal inspection and cleaning can be carried out. Moreover, since there is no risk of the sleeve part rotating with respect to the valve box part, damage to the seal part between the valve box part and the sleeve part can be prevented and the internal sealability can be ensured. In particular, inspection and cleaning of the air valve body can be performed. When performing repair work such as, it is sufficient to rotate and remove only the lid attached to the upper end opening of the sleeve part from the insertion hole, so there is a risk that a force pushing down from the top will act on the flange during the work. It is possible to prevent troubles during work, and by removing the lid, the floating valve body and float valve body inside can be easily removed. In this case, the lid can be rotated and attached / detached with the lid embedded. By mounting it freely, the upper surface can be placed on a flat surface when the lid is mounted to make it compact, and when the lid is removed, the water pressure inside can be gradually released to prevent it from coming out all at once, which improves repair workability. In addition to being extremely good, the repair work can be performed without protruding extra bolts or nuts on the upper side of the outer diameter of the flange, and the number of parts can be reduced.

According to the second aspect of the present invention, the nut member can be mounted in the flange portion in a position-controlled state and rotatably, and the sleeve portion can be moved up and down with respect to the valve box portion in a non-rotating state via the flange portion. , The communication part can be easily closed or opened by operating only the nut member.

According to the third aspect of the present invention, since the bolt head can be housed in the concave accommodating portion, the bolt head can be prevented from protruding from the lower surface of the flange of the valve box and the lower surface can be flattened. The flange can be firmly connected while being brought into close contact with a sealing member such as a gasket.

According to the invention of claim 4, since the state in which the communication portion between the sleeve portion and the valve box portion is blocked and the water stop state is reached can be confirmed by the relationship between the upper surface of the nut member and the screw tip of the bolt member, the sleeve portion It is possible to avoid an excessive rise or insufficient rise of the sleeve portion and raise the sleeve portion to an appropriate position to reliably block the communication portion.

According to the invention of claim 5, the valve box portion and the sleeve portion can be protected by the cover portion, and when the cover portion is attached, the lifting bolt member of the sleeve portion can also be used for fixing the cover portion, so that the number of parts can be reduced. While the cover part can be firmly attached.

According to the invention of claim 6, when the sleeve portion is lowered to a state where the communication portion is open, an O-ring is used between the outer circumference of the sleeve portion and the inner circumference of the valve box without depending on the amount of movement of the sleeve portion. It can be sealed and exhausted from the external piping through the communication holes while preventing leakage from these gaps.

According to the invention of claim 7, the nut member can be attached to the upper and lower flange portions in a rotatable and fall-prevention state while restricting the movement of the nut member in the vertical direction to prevent slippage and disconnection, and the nut member can be smoothly rotated. However, the sleeve portion can be moved up and down to open and close the flow path with the external piping.

It is a vertical sectional view which shows the embodiment of the non-freezing type air valve of this invention. It is a separation perspective view of the non-freezing type air valve of FIG. (A) is an enlarged cross-sectional view taken along the line AA in FIG. (B) is an enlarged cross-sectional view showing sleeve portions having different mounting states. (C) is a cross-sectional view taken along the line BB of (b). It is a partial notch enlarged perspective view of a sleeve. It is a partially omitted plan view of FIG. FIG. 5 is a sectional view taken along the line CC of FIG. It is sectional drawing which shows the state which the flow path of FIG. 6 is closed. It is a separation perspective view which shows the disassembled state of the non-freezing type air valve of FIG. (A) is a partially omitted enlarged cross-sectional view of FIG. 7. (B) is a partially enlarged cross-sectional view showing the reduced pressure state of (a). It is an enlarged sectional view of the main part which shows the other embodiment of the non-freezing type air valve of this invention. It is a vertical sectional view which shows still another embodiment of the non-freezing type air valve of this invention. FIG. 11 is a vertical cross-sectional view showing a state in which the floating valve body and the float valve body of FIG. 11 are raised. It is sectional drawing which shows the state which the flow path of FIG. 11 is closed. It is an enlarged perspective view which shows the bottom lid in FIG.

Hereinafter, embodiments of the non-freezing air valve in the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a vertical cross-sectional view showing an embodiment of the non-freezing type air valve of the present invention, and FIG. 2 shows a separated perspective view of the non-freezing type air valve.

The non-freezing type air valve of the present invention (hereinafter referred to as an air valve main body 1) is connected to an external pipe 2 mainly composed of a water pipe via a flange member 3 in a sealed state by a gasket 4, and is particularly in a cold region. It is suitable for use in water pipes 2 that may freeze, such as gaskets, underground burials, and aqueducts. The air valve main body 1 has a valve box portion 10, a sleeve portion 11, and a cover portion 12, and the sleeve portion 11 in which the floating valve body 13 and the float valve body 14 are housed is contained in the valve box portion 10. It is mounted so that it can move up and down, and the flow path to the water main 2 can be cut off by these operations. The sleeve portion 11 is provided with a lid 15, which will be described later.

The valve box portion 10 is composed of at least a cylindrical valve box 20 and an annular flange 21. Of these, the valve box 20 is formed of an appropriate steel pipe such as stainless steel to a predetermined length, and the outer peripheral side of the upper portion is screwed into the inner peripheral side of the flange 21 to be integrally fixed. A protruding annular locking portion 22 is formed on the lower outer periphery of the screwed portion of the valve box 20, and a covering plate 23, which will be described later, is attached to the annular locking portion 22 while being locked.

A plurality of elongated hole-shaped valve box side communication portions 24 are formed below the annular locking portion 22, and in the present embodiment, four valve box side communication portions 24 are provided as shown in FIG. 3A. .. As shown in FIG. 3B, even if the valve box portion 10 is attached to the sleeve portion 11 in a different mounting state, the communication portion 24 has a round hole shape formed in the sleeve portion 11 described later. The sleeve-side communication portions 25 are provided at the same height so as to face each other, so that the outside of the valve box 20 and the inside of the sleeve portion 11 are reliably communicated with each other. It is desirable that the valve box side communication portion 24 is arranged directly under the flange 21 so that the air entering between the water main main 2 and the valve box 20 can be discharged without stagnation.

As shown in FIG. 3C, a wide recess 26 is formed in an annular shape around the valve box side communication portion 24 by the tapered surface, for example, at a depth of about 0.5 mm. Since the valve box side communication portion 24 is provided in such a cross-sectional shape, the O-ring 31 is inside the valve box 20 among the O-rings 31 and 32 mounted on the outer periphery of the sleeve 30 of the sleeve portion 11 described later. Damage when sliding on the circumference is prevented.
In FIG. 1, a diameter-expanded seal groove 33 having a diameter slightly larger than the inner circumference is provided on the inner diameter of the lower end portion of the valve box 20, and the inner circumference side of the diameter-expanded seal groove 33 is on the outer circumference near the lower portion of the sleeve portion 11. It serves as a sealing surface with the attached O-ring 61, which will be described later.

The flange 21 of the valve box portion 10 is formed in an annular shape by, for example, ductile cast iron, and the entire outer surface thereof is powder-coated with an epoxy resin or the like. The inner diameter side of the flange 21 is formed to be thick, and a bolt member 35, which is a hexagon socket head cap screw bolt, is attached to the inner diameter portion at a diagonal position by screwing, and the tip side of the bolt member 35 is attached to the inner diameter portion. It is erected on the upper part of the valve box portion 10.

On the bottom surface side of the flange 21, a concave accommodating portion 36 having an enlarged diameter from the screwed portion is formed, and the head 35a of the bolt member 35 is accommodated in the concave accommodating portion 36. In this way, the bolt head 35a is locked to the concave accommodating portion 36 to prevent the bolt member 35 from moving upward with respect to the flange 21, and the tip end side thereof is set to a predetermined height. Although not shown, the bolt member may be an implantable bolt provided with a lock.

The upper surface of the inner diameter portion of the flange 21 is provided flat so that the bottom surface of the flange portion 40 provided on the sleeve portion 11 described later can be brought into contact with the lower surface. Further, the lower surface of the inner diameter portion of the flange 21 is also provided in a flat shape, and a covering plate 23 made of, for example, a stainless steel material is provided on the lower surface side of the flange portion. An annular tapered groove 41 is formed on the inner diameter edge portion on the lower surface side of the flange 21, and a bolt insertion hole 42 is formed on the outer diameter side of the flange 21.

The covering plate 23 covers the lower surface of the flange 21 on the inner diameter side, and is provided so as to prevent corrosion of the sealing region with the flange member 3 by the gasket 4. When the covering plate 23 is provided, the entire flange 21 can be manufactured of cast iron made of ductile or the like. At this time, as compared with the case where the entire flange is made of stainless steel, the cost can be suppressed and the coating plate 23 can secure corrosion resistance.

When the flange member 3 on the water main 2 side is of GF type, the outer diameter of the covering plate 23 is set to be substantially the same as the outer diameter of the gasket seat. In this case, since the GF type gasket has the same size as the outer diameter of the gasket seat of the RF type flange, it can also be used for the RF type. As described above, the covering plate 23 is locked to the annular locking portion 22 on the inner diameter side and fixed to the outer periphery of the valve box 20.

An O-ring 43 is mounted between the covering plate 23 and the annular tapered groove 41 of the flange 21, and the valve box 20, the flange 21, and the covering plate 23 are sealed by the O-ring 43. By holding the O-ring 43 from below by the covering plate 23, it is possible to prevent the O-ring 43 from falling off from the annular tapered groove 41.

By mounting the covering plate 23 on the flange 21, the bolt head 35a is also covered with the covering plate 23. As a result, even if the bolt member rotates with the rotation of the nut member 50 described later, the bolt member is prevented from falling off.

In FIGS. 1 and 2, the sleeve portion 11 is composed of at least a sleeve 30, a flange portion 40, a nut member 50, a bottom lid 51, and a lid 15, and the sleeve portion 11 has a floating valve body 13 and a float valve body 14. Is built-in.

The sleeve 30 is formed in a substantially cylindrical shape by a general steel pipe such as stainless steel, an annular collar portion 52 is formed on the upper outer circumference, a female thread portion 53 is formed on the upper inner circumference, and a circle is formed below the collar portion 52. A hole-shaped sleeve-side communication portion 25 is formed, and the sleeve-side communication portion 25 can communicate with the valve box-side communication portion 24 described above when the air valve main body 1 operates.

As shown in FIG. 3C, a wide concave portion 56 is formed around at least the outer peripheral side of the sleeve side communication portion 25 by the tapered surface, for example, as in the concave portion 26 of the valve box side communication portion 24. It is formed in an annular shape with a depth of about 5 mm. A predetermined gap S is provided between the concave portion 56 and the concave portion 26 between the inner circumference of the valve box 20 and the outer circumference of the sleeve 30 and the inner circumference of the valve box 20 without contact with each other. The area is secured. As a result, the ventilation state can be ensured without the sleeve-side communication portion 25 and the valve box-side communication portion 24 facing each other. Since the concave portion 56 is provided on the outer circumference of the sleeve 30, it can be easily formed by cutting or the like.

In this case, since the elongated hole-shaped valve box-side communicating portion 24 is provided with a plurality of round-hole-shaped sleeve-side communicating portions 25 facing each other, FIGS. 3 (a) and 3 (b) are shown. As shown in the above, even if the positional relationship between the sleeve-side communication portion 25 and the valve box-side communication portion 24 changes, the communication state between these communication portions 25 and 24 is maintained to ensure a high air flow rate. In either case, ventilation is possible with high efficiency. Therefore, in order to make the communicating portions 24 and 25 face each other, it is not necessary to fix the sleeve 30 to the flange 21 by welding or the like while adjusting the rotation in a predetermined direction. For example, when the gap between the valve box 20 and the sleeve 30 is 0.2 mm, the distance between the gap S provided with the recess 26 and the recess 56 can be expanded to about 1.2 mm.

An O-ring 57 that closely seals the inner circumference of the valve box 20 is mounted on the upper outer periphery of the sleeve-side communication portion 25 of the sleeve 30, and the fluid flowing from the valve box-side communication portion 24 by this O-ring 57 normally flows. That is, when the air valve main body 1 is operated, water is prevented from entering the upper side of the valve box 20 from between the valve box 20 and the sleeve 30. An appropriate number of O-rings including the O-ring 57 are mounted on the outer circumference of the sleeve 30.

On the other hand, the O-rings 31 and 32 are mounted on the lower side of the communication portion, and these O-rings 31 and 32 communicate with the valve box side when the sleeve 30 is raised with respect to the valve box 20 in FIG. It is arranged at the upper and lower positions so as to sandwich the portion 24. As a result, the fluid flowing in from the communication portion 24 is prevented from entering between the valve box 20 and the sleeve 30 at each seal position.

As shown in FIGS. 6 and 7, in the circumferential direction of the lower part of the sleeve, for example, a communication hole 60 having a small diameter of about φ6 mm is formed at at least one place for filling water, and the communication hole is filled with water. At that time, the float valve body 14 floats up. An O-ring 61 and a backup ring 62 are attached to the lower portion of the communication hole 60. When the communication hole 60 is closed in FIG. 7, the O-ring 61 seals the diameter-expanded seal groove 33 and the communication hole 60 is closed from the outside. It will be in a detached state.

A bottom lid 51 is fixed to the lower end side of the sleeve 30 by screwing, and the lower end side of the sleeve 30 is closed by the bottom lid 51. The bottom lid 51 is provided with an outer diameter substantially equal to the outer diameter of the sleeve 30, and the upper end side thereof is formed to have a thin wall shape. When the bottom lid 51 is integrated with the sleeve 30, a mounting groove 63 is provided between the bottom lid 51 and the sleeve 30, and the O-ring 61 and the backup ring 62 are mounted in the mounting groove 63. By providing the backup ring 62 in front of the O-ring 61, the O-ring 61 is protected when the bottom lid 51 is screwed in, and damage or twisting of the O-ring 61 is prevented.

The enlarged diameter portion on the upper outer diameter side of the bottom lid 51 becomes a contact surface with the lower end of the valve box 20, and the rising position of the sleeve portion 11 is regulated by these contact surfaces, that is, the lift stopper function is exhibited. To. In this case, the surface roughness of these contact surface portions may be finely set to form a metal seal surface, and the double seal function of the O-ring 61 may be exhibited when the sleeve of FIG. 7 is raised.

In FIGS. 2 and 6, the flange portion 40 of the sleeve portion 11 is composed of the lower flange portion 40a and the upper flange portion 40b and is provided on the upper end side of the sleeve portion 30.
The lower flange portion 40a is provided with an insertion hole 70 for mounting the sleeve in the center thereof, and an engaging step portion 71 to which the flange portion 52 of the sleeve 30 can be engaged is formed at the upper surface edge portion of the insertion hole 70. As a result of these engagements, the lower flange portion 40a rises and the sleeve 30 can also rise. The lower flange portion 40a has a substantially square outer shape, and two through hole portions 72, 72 are formed at diagonal positions thereof so as to sandwich the insertion hole 70, and a bolt member 35 to be inserted into the through hole portion 72. The nut member 50 is provided so as to be dispositionable. The lower flange portion 40a is provided separately from the sleeve 30, but these may be integrally formed.

On the other hand, the upper flange portion 40b is provided with an insertion hole portion 73 for mounting the lid 15 in the central portion, and a reduced diameter portion 74 to which the upper surface of the flange portion 52 of the sleeve 30 can come into contact with the lower portion of the insertion hole portion 73. Is formed. As a result, the flange portion 52 is locked to the reduced diameter portion 74, so that the sleeve 30 can be lowered as well as the upper flange portion 40b. The upper flange portion 40b is provided in a substantially square shape having substantially the same shape as the lower flange portion 40a, and an insertion hole 75 communicating with the through hole portion 72 is provided at a diagonal position thereof so as to sandwich the insertion hole portion 73. An enlarged diameter stepped portion 76 is formed in the lower portion of the insertion hole 75. A nut member 50 is provided inside the insertion hole 75 so that it can be mounted.

As shown in FIGS. 2 and 8, in the upper flange portion 40b, two engaging bolts having an enlarged upper diameter can be inserted into a fixing bolt 77 made of a hexagon socket head cap screw at a position orthogonal to the insertion hole portion 73. The holes 78 are provided so as to face each other. On the other hand, two female screw portions 79 are provided so as to face each other at the positions corresponding to the engagement holes 78 of the lower flange portion 40a. The lower flange portion 40a and the upper flange portion 40b are fixed together with a fixing bolt 77 from above the upper flange portion 40b via the engaging hole 78 and the female screw portion 79 while incorporating the nut member 50. Will be done.

When the screwing of the fixing bolt 77 is completed, the head 77a of the fixing bolt is housed in the enlarged diameter portion of the engaging hole 78. Therefore, in this buried state, as shown in FIG. 5, the upper flange portion 40b is covered with at least the engagement hole 78 with a covering material 80 which is a sealing material formed of a thin film material from the upper surface side, so that the air valve main body 1 It is possible to prevent the fixing bolt 77 from being accidentally rotated during repair or the like. It is preferable that the covering material 80 is provided with a display portion 81 including an arrow in the rotation direction of the nut member 50 at the time of repair.

In FIGS. 1 and 2, the nut member 50 is formed in a substantially cylindrical shape having an outer diameter that can be mounted in the insertion hole 75 of the upper flange portion 40b, and a female screw 90 is formed in the central portion thereof. It is screwed into the screw 91 of the bolt member 35. An annular flange portion 92 that engages with the stepped portion 76 of the upper flange portion 40b is provided on the bottom portion of the nut member 50. The nut member 50 may have a structure that can be rotatably engaged with the stepped portion 76, and for example, a C-shaped retaining ring or a split ring (not shown) may be attached instead of the annular flange portion 92.
The upper part of the nut member 50, more specifically, the portion protruding from the upper flange portion 40b when the nut member 50 is housed in the flange portion 40, is a commonly used tool such as a spanner or a wrench, which is not shown. A locking surface 93 for a rotation operation is provided. The locking surface 93 is formed, for example, in a hexagonal cross section.

The nut member 50 is mounted in an engaged state between the flange portions 40 divided into upper and lower parts, whereby the nut member 50 is mounted on the flange portion 40 in a position-restricted state and rotatably, and is screwed on the bolt member 35. It is also provided so that it can move up and down. At that time, the annular flange portion 92 is engaged with the stepped portion 76 of the upper flange portion 40b, and the bottom surface side is brought into contact with the upper surface side of the lower flange portion 40a, so that the sleeve portion 11 is nutted via the flange portion 40. It is provided so as to be able to move up and down together with the member 50.

In this way, the sleeve portion 11 is forcibly moved up or down with respect to the valve box portion 10 in a non-rotating state by screwing into at least two bolt members 50, and FIG. 6 or FIG. 7 shows. As shown, the sleeve-side communication portion 25 and the valve box-side communication portion 24 are mutually closed or opened, and the flow path to and from the water main main 2 is provided so as to be openable and closable.

In this case, the length of the bolt member 35 is such that the upper surface of the nut member 50 and the screw tip 35b of the bolt member 35 are substantially the same height in the state where the communication portions 24 and 25 in FIG. 7 are closed. Is set to. The nut member 50 can be moved by a moving distance D from the open state of the air valve main body 1 of FIG. 1 until the upper surface side in the closed state becomes substantially the same height as the screw tip 35b of the bolt member.

In FIGS. 1 and 2, the lid 15 is formed in a substantially annular shape having a large air hole 100 in the center, and is provided on the upper portion of the sleeve portion 11. A male threaded portion 101 is formed on the lower outer periphery of the lid 15, and the male threaded portion 101 is screwed into the female threaded portion 53 on the upper inner circumference of the sleeve 30, so that the lid 15 can be attached to and detached from the inner peripheral side of the sleeve 30. It is attached to. A valve chamber 102 in which the floating valve body 13 and the float valve body 14 can move is provided between the lid 15 and the sleeve portion 11 and the above-mentioned bottom lid 51 provided under the sleeve portion 11, and the lid is provided. When the 15 is removed, the water pressure in the valve chamber 102 can be gradually released as the screw is loosened.

An O-ring 103 is provided on the outer periphery of the upper portion of the screw portion 101 of the lid 15, and when the lid 15 is screwed into the sleeve 30, the O-ring 103 can be closely sealed to the inner circumference of the sleeve 30. An enlarged diameter contact step portion 104 is formed on the upper portion of the O-ring 103, and after the screwing of the lid 15 is completed, the contact step portion 104 abuts on the upper end of the sleeve 30 to position the lid 15. Be retained.

As shown in FIG. 6, the O-ring 103 is located at a distance H from the upper end side of the contact step portion 104 so that the seal state with the sleeve portion 11 is released with the lid 15 slightly loosened. Be placed. As a result, the O-ring 103 is slightly downward from the upper end side of the sleeve 30 in a state where the contact step portion 104 of the lid 15 is in contact with the upper end side of the sleeve 30, that is, in a state where the lid 15 is completely screwed. The inner circumference of the sleeve 30 is sealed at the position of. Therefore, when the lid 15 is removed at the time of repairing the air valve main body 1, the sealed state by the O-ring 103 is maintained for the distance H.

A valve seat surface 105 is formed on the bottom surface side of the lid 15 so that the floating valve body 13 abuts and closes the large air hole 100, and an O-ring 106 is attached to the valve seat surface 105. Since the valve seat surface 105 is automatically aligned by the screwed structure of the lid 15 into the sleeve 30, the aligned valve seat surface 105 improves the sealing property with the floating valve body 13.

As described above, since the O-ring 106 on the valve seat surface side is arranged in a so-called stepped shape located below the O-ring 103 mounted on the outer periphery of the upper part of the lid, the height of the valve seat surface 105 is high. Since the position is lower than the mounting surface of the lid 15, it is less affected by the outside air, and the antifreezing property is improved. Since the O-ring 106 can exhibit anti-freezing property if it is arranged in a stepped shape, it is not always necessary to fix the lid 15 by screwing for the purpose of improving the O-ring 106. For example, the lid 15 is fitted by fitting. It may be attached to the sleeve 30.
Further, since the small air hole valve seat 13b provided in the lower part of the small air hole 13a of the floating valve body 13 described later is located below the bottom surface side of the flange 21 of the valve box portion 10, this small air hole valve The antifreeze property of the seat 13b is also improved.

Since the floating valve body 13 has a structure in which the floating valve body 13 abuts on the O-ring 106 to ensure a sealable structure, and the lid 15 and the sleeve 30 are peripherally sealed by the O-ring 103 when the lid 15 is attached, the O-ring is provided. Leakage from these screwed portions is prevented by 103. When the lid 15 is removed, the state of sealing by the O-ring 103 gradually rises, and the internal pressure is reduced. When the O-ring 103 reaches the upper end surface of the sleeve 30, the sealed state is released.

As shown in FIG. 1, in the present embodiment, after the lid 15 has been screwed into the sleeve 30, the upper surface side of the lid 15 is provided so as to be arranged on substantially the same plane as the upper surface side of the upper flange portion 40b. .. As a result, it can be visually recognized from the outside that the screwing of the lid 15 is completed.

The lid 15 is provided so that it can be removed from the sleeve 30 by, for example, rotating about 3.5 turns from the screwed state. In this case, it is desirable that the seal state by the O-ring 103 is maintained at least during the first rotation when loosening the lid 15, that is, between one lead of the screwing between the male thread portion 101 and the female thread portion 53.

As shown in FIGS. 5 and 8, a cross-shaped engaging groove 110 is provided on the upper portion of the lid 15, and the lid 15 attachment / detachment tool is provided along the engaging groove 110 so as to be mounted.

In FIG. 7, when the tool mounted on the engaging groove 110, for example, a long rod-shaped tool is rotated, the engaging groove 110 is provided on the regulating portion 50 provided on the upper portion of the air valve main body 1. It is placed at the position of contact. The regulating portion in the present embodiment is a nut member 50, which is provided so that the tool mounted on the engaging groove 110 comes into contact with the nut member 50 by rotation, but protrudes above the air valve body 1. As long as the lid attachment / detachment tool attached to the engagement groove 110 can be abutted and locked, the mode is not particular.

As shown in FIG. 8, the floating valve body 13 and the float valve body 14 are each made of resin or hollow stainless steel and formed in a substantially columnar shape, and these can be attached to and detached from the inside of the sleeve 30 in a stacked state. It is installed.
In FIGS. 6 and 7, a small air hole 13a is provided in the center of the floating valve body 13, and a small air hole valve seat 13b sealed by the upper surface side of the float valve body 14 is provided on the lower inner circumference of the small air hole 13a. A fixing member 13c is attached to the small air hole valve seat 13b. Since the bottom surface side of the lid 15 is inserted into the sleeve 30 by screwing into the sleeve 30, the valve seat surface 105 on the bottom surface side of the large air hole 100 is also located inside the sleeve 30, that is, the water main. It is provided at a position lowered to the 2 side.

As a result, the floating valve body 13 that comes into contact with the valve seat surface 105 is also lowered to the water main 2 side, and the small air hole valve seat 13b of the floating valve body 13 is also lowered to the water main 2 side accordingly. .. In the present embodiment, the position of the small air hole valve seat 13b when the floating valve body 13 comes into contact with the valve seat surface 105 is closer to the water main 2 side than the lower surface of the flange 21 of the valve box portion 10. It is provided in. Then, when the air valve main body 1 is connected to the water main, the small air hole valve seat 13b is located inside the water main 2, so that the small air hole valve seat 13b valve seat surface is frozen. Can be effectively prevented.

On the other hand, the float valve body 14 has substantially the same outer diameter as the floating valve body 13 and is formed to be longer than the floating valve body 13. These float valve bodies 14 and floating valve bodies 13 receive buoyancy according to the water level in the valve box 20, and are guided by the sleeve 30 so that they can move up and down smoothly. This operation causes a large amount of air contained in tap water. It is provided so as to be discharged to the outside of the air valve main body 1 through the air hole 100.

In FIGS. 1 and 2, the cover portion 12 is composed of at least a cover main body 120 and a heat insulating material 121, and is provided so that the valve box portion 10 and the sleeve portion 11 can be covered from above.
The cover body 120 is processed into an inverted bowl shape having a substantially U-shaped cross section using, for example, a stainless steel plate material, and the heat insulating material 121 is attached to the inner surface side of the cover body 120. Bolt holes 122 are drilled in two places in the cover portion 12, and screws 91 of the bolt member 35 screwed into the nut member 50 are inserted from below the bolt holes 122 and protrude from the upper part of the cover body 120. A bag nut 123 is screwed onto the tip end side of the male screw 91, and by tightening the bag nut 123, it is fixed so as to cover it from above.

In this case, a washer-shaped spacer 124 is interposed between the back surface side of the cover body 120 and the nut member 50. When the bag nut 123 is tightened, the periphery of the bolt hole 122 is supported from the back surface side by the spacer 124 to prevent the cover body 120 from being deformed. Further, if the spacer 124 is made of resin, the strength around the bolt hole 122 can be secured while suppressing the cost. The spacer 124 may be fixed to the heat insulating material 121 in advance, or may be integrally molded with the heat insulating material 121. In the present embodiment, the spacer 124 is fixed to the heat insulating material 121 by insert molding, whereby the spacer 124 falls off. And loss is prevented.

The heat insulating material 121 is housed so as to be in contact with the inner surface of the cover main body 120, an exhaust passage 125 is provided on the inner peripheral surface side of the heat insulating material 121, and the air flowing out from the large air hole 100 of the lid 15 is exhausted. It is discharged to the outside through the road 125. The heat insulating material 121 is formed with an insertion hole (not shown) for mounting the nut member 50 and a mounting recess 126 for mounting the spacer 124.

In the above embodiment, the bolt member 35 is attached by screwing from the bottom surface side of the flange 21, but the bolt member may be an embedded bolt and screwed from the upper surface side of the flange 21.
Further, when the communication portions 24 and 25 are closed to each other by raising the sleeve 11 with respect to the bolt member 35 via the nut member 50, the flow path is closed and the sleeve 11 is lowered via the nut member 50. As a result, the flow path is opened when the communication portions 24 and 25 are opened, but these may be reversed so that the communication portions 24 and 25 are closed when the nut member 50 is lowered.

The valve box side communication portion 24 is provided in a long hole shape and the sleeve side communication portion 25 is provided in a round hole shape, but these may be reversed, and the valve box side communication portion 24 has a recess 26 and a sleeve side communication portion 25. Although each of the concave portions 56 is provided in the above, one of these may be provided.

Subsequently, the procedure for assembling the above-mentioned air valve main body will be described.
In FIGS. 1 and 2, first, the bolt member 35 is screwed from the bottom surface side of the flange 21 until the head portion 35a is accommodated in the concave accommodating portion 36. By this screwing, the male screw 91 is in a state of protruding from the upper surface side of the flange 21 while the screw tip 35b is set to a predetermined height. An O-ring 43 is fitted and mounted in the annular tapered groove 41 on the bottom surface side of the flange.

Subsequently, the covering plate 23 is arranged so as to overlap with the predetermined position on the bottom surface side of the flange 21, and the valve box 20 is screwed from the bottom surface side of the flange 21 to fix the valve box 20 to the flange portion 21 to fix the valve box portion 10. Constitute. At this time, by locking the annular locking portion 22 to the bottom surface side of the covering plate 23, the valve box 20 can be mounted at a predetermined position of the flange 21, and the covering plate 23 can be mounted between the annular locking portion 22 and the flange 21. It is prevented from falling off by sandwiching.

On the other hand, the sleeve 30 is inserted from above the lower flange portion 40a so that the flange portion 52 is engaged with the engaging step portion 71, and the O-rings 31, 32, and 57 are mounted on the outer circumference of the sleeve 30, respectively. Subsequently, the sleeve 30 is inserted into the valve box 20 from above, the O-ring 61 and the backup ring 62 are attached to the lower part of the sleeve 30 from below in this order, and the bottom lid 51 is screwed into the lower end side of the sleeve 30. Stick. As a result, the O-ring 61 can be mounted in the mounting groove 63 between the sleeve 30 and the bottom lid 51 in a state of being protected by the backup ring 62.

Next, after screwing the nut member 50 into the bolt member 35 to the extent that the nut member 50 comes into contact with the lower flange portion 40a, the upper flange portion 40b is placed on the lower flange portion 40a while inserting the nut member 50 into the insertion hole 75. To do. In this state, the fixing bolt 77 is screwed into the female screw portion 79 of the lower flange portion 40a from the two engaging holes 78 of the upper flange portion 40b. At this time, the two fixing bolts 77 are alternately tightened so that the nut member 50 is evenly sandwiched between the lower flange portion 40a and the upper flange portion 40b, and then tightened until the fixing bolt head 77a is housed in the enlarged diameter portion. ..

The float valve body 14 and the floating valve body 13 are inserted into the sleeve 30 in this order, and the lid 15 is attached to the sleeve 30 at a predetermined position by screwing the male threaded portion 101 into the female threaded portion 53 from the insertion hole portion 73. To do.

Finally, the cover portion 12 in which the heat insulating material 121 and the spacer 124 are housed is mounted on the nut member 50 from above the valve box portion 10, and the bag nut 123 is screwed onto the bolt member 35 to fix the cover body 120. To do. By the above procedure, the assembly of the air valve main body 1 is completed.

When the air valve main body 1 is connected to the water main main 2, as shown in FIG. 1, the air valve main body 1 stands at a branch position of a cheese-shaped flange member 3 in the water main main 2 piped in a substantially horizontal direction. It is installed in the installed state. The flange member 3 has a connection portion 3a to the water main body 2, a tubular portion 3b for mounting the air valve main body 1, and a flange connection portion 3c with the air valve main body 1, and a bolt nut 130 is attached to the flange connection portion 3c. The flange 21 of the air valve body 1 is fixed. The flange connecting portion 3c is provided in a GF type (grooved) manner, and a sealing gasket 4 is attached to the groove portion, and the gasket 4 seals between the flange connecting portion 3c and the air valve main body 1. In this case, by providing the covering plate 23 on the lower surface side of the flange 21 of the air valve body 1, the corrosion resistance of the gasket seal region is ensured, and the air valve body 1 is connected in a state where the adhesion with the gasket 4 is improved. it can.

After the air valve main body 1 is connected, the lower part of the sleeve portion 11 is inserted into the tubular portion 3b, and the sleeve portion 11 and the valve box portion 19 are arranged at a position higher than the water main main 2. As a result, the sleeve-side communication portion 25, the valve box-side communication portion 24, and the water-filling communication hole 60 are also provided at positions higher than the water main main 2.

If there is no water in the valve box 20 of the air valve main body 1 after connecting to the water main 2, the float valve body 14 and the floating valve body 13 descend from the state shown in FIG. 1, and the large air of the lid 15 is reached. The hole 100 is opened, and rapid exhaust and rapid intake operations are performed from this state.

The rapid exhaust is an operation in which a large amount of air in the pipeline is rapidly exhausted through the large air hole 100 when the water main 2 is filled with water. At the time of rapid exhaust, both the floating valve body 13 and the float valve body 14 are located below the sleeve 30 without floating, so that the large air hole 100 is fully opened. As a result, the air in the pipeline is efficiently discharged to the outside through the valve box side communication portion 24, the sleeve side communication portion 25, and the large air hole 100 of the air valve main body 1. At this time, since the communication hole 60 is provided at one place and has a small diameter, the float valve body 14 and the floating valve body 13 do not rise due to the air flowing in from the communication hole 60, so that the large air hole 100 Does not block.

The rapid intake is an operation of rapidly sucking a large amount of water into the pipeline through the air valve body 1 when the water in the pipeline is discharged, and the floating valve body 13 and the float valve body 14 are lowered. It is carried out. In this case, the large air hole 100 is opened, and the air is efficiently taken in through the large air hole 100, the sleeve side communication portion 25, and the valve box side communication portion 24, and the drainage in the pipeline is quickly performed.
With these rapid exhaust and rapid intake, operations such as initial water supply to the water main 2 and drainage from the water main 2 can be performed in a short time.

When the inside of the air valve main body 1 is filled with water, a force that pushes up the float valve body 14 from below acts mainly by entering the inside through the communication hole 60. As a result, the float valve body 14 rises smoothly, and the float valve body 14 also surely raises the floating valve body 13 to a predetermined position at the time of filling.

When the filling of the air valve body 1 is completed and the inside of the pipeline is full, the float valve body 14 and the floating valve body 13 are raised by buoyancy, and the upper surface side of the floating valve body 13 is covered. The large air hole 100 is closed in close contact with the valve seat surface 105, and the float valve body 14 closes the small air hole 13a of the floating valve body 13. As a result, the outflow of water from the valve chamber 102 to the outside is prevented.

Under the pressure at the time of filling (for example, 0.1 to 0.75 MPa when the nominal diameter is 25), the air mixed in the water main 2 gradually gathers in the air valve main body 1 and the valve chamber It collects on the top of 102. When this amount of air reaches a certain level, only the float valve body 14 first descends, the small air holes 13a of the floating valve body 13 are opened, and air is exhausted.

When the amount of air in the valve box 20 decreases due to the discharge of air, the float valve body 14 rises due to the buoyancy of water and closes the small air hole 13a again. By repeating the above operation, the air accumulated in the main pipe is automatically discharged to the outside of the valve via the air valve main body 1.

Next, the operation of the non-freezing air valve of the present invention in the above embodiment will be described.
When performing repair work such as inspection and cleaning of the air valve main body 1, first, loosen the bag nut 123 from the state shown in FIG. 1 and lift the cover portion 12 to remove it from the valve box portion 10. In this state, in FIG. 6, a tool such as a spanner is locked on the locking surfaces 93 of the two nut members 50 and rotated in a direction of loosening (the direction in which the nut member 50 rises) little by little. At this time, the annular flange portion 92 of the nut member 50 engages with the stepped portion 76 of the upper flange portion 40b, and the engaging step portion 71 of the lower flange portion 40a integrated with the upper flange portion 40b engages with the flange portion 52 of the sleeve 30. As a result, the flange portion 40 and the sleeve 30 also rise, and the sleeve 30 rises with respect to the valve box 20 to mutually close the communication portions 24 and 25 as shown in FIG. 7, and the air valve main body 1 The flow path between the water main and the water main 2 can be cut off.

At this time, the O-ring 61 mounted in the mounting groove 63 fits into the enlarged diameter seal groove 33 of the valve box, and the sleeve 30 and the lower end side of the valve box 20 are sealed by the O-ring 61. As a result, the communication hole 60 can be blocked to prevent water from entering.
Due to the above-mentioned blockage of the communication portions 24 and 25, the shutoff state of the communication hole 60, and the state in which the float valve body 14 and the floating valve body 13 block the small air hole 13a and the large air hole 100, water pressure is generated in the valve chamber 102. It will be sealed.
In this state, by removing the lid 15, the floating valve body 13 and the float valve body 14 inside can be removed to carry out repair work on these parts and the inside.

In this way, by raising the sleeve portion 11 through the screwing of the nut member 50 and the bolt member 35, the flow path is manually forcibly opened without utilizing the water pressure in the water main main 2. Can be blocked. In this case, there are no unnecessary tightening parts such as attachment / detachment bolts and nuts on the upper surface side of the lid 15, and only the nut member 50 needs to be rotated, so that the work can be simplified and the flow path can be easily provided without making a mistake in the work process. Can be opened and closed.

Moreover, since the nut member 50 is rotatably mounted while restricting the position with respect to the flange portion 40, the sleeve portion 11 does not rotate together with the nut member 50, and the sleeve portion 11 is valved in a non-rotating state. It can rise with respect to the box portion 10. Therefore, it is possible to prevent damage to the O-ring due to the rotation of the sleeve portion 11 to ensure sealing performance, and to reduce the tool handling space.

In FIG. 9, when the lid 15 is removed, the lid 15 is detachably screwed into the upper part of the sleeve portion 11, so that the movement width T is changed from the state of FIG. 9 (a) to the state of FIG. 9 (b). When the air valve body 1 is loosened and raised by a minute, the volume inside the valve chamber 102 of the air valve body 1 can be expanded and the enclosed water pressure can be reduced. At this time, the O-ring 103 mounted on the outer peripheral side of the lid 15 can be sealed between the lid 15 and the sleeve portion 11 to maintain the leakage prevention state, and the lid 15 is screwed and attached so that the lid 15 can be attached. There is no risk of getting out all at once.

Further, by arranging the O-ring 103 at a position where the seal position with the sleeve portion 11 is released after the lid 15 is slightly loosened, for example, the lid 15 is rotated about 1.5 times, the lid 15 is about. After expanding the volume of the valve chamber 102 to the state shown in FIG. 9B by rotating it once, loosen the lid 15 little by little to gradually release the side seal by the O-ring 103 and screw it in. The water pressure in the valve chamber 102 is gradually released from the gap between the portions, that is, the gap between the male thread portion 101 and the female thread portion 53, using the so-called "leakage phenomenon" to prevent the upper end side of the sleeve 30 from opening at once. it can. In this way, by rotating the lid 15 about 3.5 times, the inside of the valve chamber 102 is gradually depressurized so that the lid 15 can be removed while preventing the phenomenon of water spouting, so that safe repair work can be performed. It becomes.

In FIG. 8, by providing an engaging groove 110 for mounting a cross-shaped tool on the upper portion of the lid 15, a tool such as a spanner can be vertically inserted into the engaging groove 110 to rotate the lid 15. .. Therefore, the repair work can be performed without projecting extra bolts, nuts, or the like on the upper side of the lid 15, and the number of parts can be reduced.

Moreover, when the tool mounted on the engaging groove 110 is rotated, the engaging groove 110 is provided at a position where the tool comes into contact with the nut member 50, so that the tool is rotated approximately 90 ° each time. Is abutted and locked to the regulating portion 50 to prevent further rotation. Subsequently, by inserting the tool in the horizontal direction intersecting the vertical direction of the locking groove 110, the operator can similarly rotate the lid by 90 ° without changing the working position. By repeating this process, the lid 15 can be attached to and detached from the sleeve 30 without using a special tool, and by preventing the lid 15 from being loosened once, water is surely prevented from being ejected from the valve chamber 102.

As described above, when repairing the air valve main body 1, the communication portions 24 and 25 and the communication hole 60 are closed without removing the air valve main body 1 from the water main 2 (flange member 3), and the water main 2 2 is repaired. Internal parts can be removed while blocking the leakage to the outside.

After the repair work, the air valve main body 1 may be assembled in the reverse procedure of the above to return the flow path to the water main 2 to the open state. When the flow path is opened, the two nut members 50 are rotated little by little in the direction of tightening with a tool (the direction in which the nut member 50 descends). As a result, the bottom surface of the nut member 50 comes into contact with the upper surface side of the lower flange portion 40a, the lower flange portion 40a is lowered, and the reduced diameter portion 74 of the upper flange portion 40b presses the flange portion 52, so that the sleeve 30 is lowered. In this way, the communication portions 24 and 25 between the sleeve portion 11 and the valve box portion 10 can be opened to each other to return the flow path to the open state.

FIG. 10 shows another embodiment of the non-freezing air valve of the present invention. In the following embodiments, the same parts as those in the previous embodiments are represented by the same reference numerals, and the description thereof will be omitted.
In this embodiment, as shown in FIG. 10A, a through hole 140 for releasing residual pressure in the valve chamber 102 is provided above the communication portion 25 of the sleeve 30, specifically above the O-ring 57. It is provided. In this case, the sleeve 30 is raised with respect to the valve box 20 during repair or the like, and as shown in FIG. 10B, when the through hole 140 reaches the vicinity of the upper end of the valve box 20, the through hole 140 is formed. The seal state with the valve box 20 is released, and the water pressure in the valve chamber 102 is discharged from the through hole 140. Therefore, it is possible to automatically release the water pressure in the valve chamber 102 by shutting off the flow path between the air valve main body 1 and the water pipe 2. In the figure, when the through hole 140 is formed in the sleeve 30, the water pressure in the valve chamber 102 is released from the through hole 140 except during repair by separately providing the sealing O-ring 141 above the through hole 140. It is good to prevent this.

A tapered surface portion 142 whose diameter increases toward the upper portion is provided on the upper inner circumference of the valve box 20, and water pressure is discharged to the outside from the through hole 140 through the tapered surface portion 142. Therefore, the residual pressure can be released even when the rising position of the sleeve 30 in which the through hole 140 does not reach the upper end of the valve box 20 is slightly low. The tapered surface portion 142 also has a function of preventing damage to the O-ring 141 when the sleeve 30 is inserted into the valve box 20 when the air valve main body 1 is assembled.
Further, the tapered surface portion 142 can reduce the sliding resistance to the O-ring 141 when the sleeve 30 is lowered after being raised to prevent damage to the O-ring 141.

11 to 13 show still another embodiment of the non-freezing air valve of the present invention. In the air valve main body 150 in this embodiment, the sleeve portion 11 has a bottom lid 151, a sleeve 30, a flange portion 40, a nut member 50, and a lid 15, and the inside of the sleeve portion 11 is the same as in the above embodiment. , The floating valve body 13 and the float valve body 14 are built in.

The bottom lid 151 shown in FIG. 14 has a substantially columnar base portion 152, an annular protrusion 153 located at the upper part of the base portion 152, and a diameter-expanded portion 154 located at the lower part of the base portion 152. It is attached to the lower opening side and can be covered.
An annular groove 160 is formed on the upper surface of the base portion 152 with a predetermined width and depth, and a communication hole 161 that communicates the annular groove 160 with the outside is formed in the direction of intersection with the annular groove 160. The annular groove 160 is concentrically provided on the upper surface of the base 152.

Similar to the case of the above-described embodiment, the communication hole 161 is formed at at least one place under the bottom lid 151 by, for example, a small diameter of about φ6 mm, and the communication hole 161 is used to form a sleeve from the annular groove 160. Water can be filled in the portion 11. The communication hole 161 is formed, for example, by drilling a drill from the side surface of the bottom lid 151 toward the annular groove 160, and is easily formed by advancing the drill until it reaches the annular groove 160. Although not shown, the base 152 may be formed with a communication hole 161 without providing the annular groove 160. In this case, the communication hole 161 may be formed by drilling from the upper surface and the side surface of the base 152 to communicate with each other. It can be formed. A plurality of communication holes 161 may be formed radially, for example, which enables even filling of water directly under the float valve body 14.

A truncated cone 162 is formed on the central side of the annular groove 160 with an appropriate outer diameter and height, and a truncated cone portion 163 formed in the center of the bottom surface of the float valve body 14 is formed on the truncated cone 162. It is provided so that it can come into contact with the valve body 14 when it descends. Since the communication hole 161 described above is located below the truncated cone 163, it is located below the bottom surface of the lowered float valve body 14.

A male screw portion 170 is formed on the outer periphery of the annular protrusion 153, and the male screw portion 170 is provided so as to be screwable to a female screw portion 171 formed on the inner circumference of the lower portion of the sleeve 30. By screwing the male screw portion 170 and the female screw portion 171, the bottom lid 151 is attached to the lower part of the sleeve 30.

The diameter-expanded portion 154 is formed in a disk shape having a diameter larger than that of the base portion 152, and the upper surface 154a of the diameter-expanded portion 154 is provided so as to be in contact with the lower end portion 20a of the valve box 20. By these abutments, the lift stopper function is exhibited as in the above-described embodiment, and the position when the sleeve portion 11 is raised as shown in FIG. 13 can be regulated. An O-ring 172 is mounted slightly above the enlarged diameter portion 154 of the bottom lid 151, and the O-ring 172 seals between the outer circumference of the bottom lid 151 and the inner circumference of the valve box 20. A parallel two-sided portion 173 is formed on the outer peripheral side of the enlarged diameter portion 154, and the bottom lid 151 can be easily attached by gripping and rotating the parallel two-sided portion 173 with a tool.

In this case, as described above, the communication hole 161 is formed in the bottom lid 151, and the O-ring 172 is mounted between the communication hole 161 and the enlarged diameter portion 154. Since the ring 172 hits the enlarged diameter portion 154, there is no possibility of moving in the falling direction. Therefore, damage and twisting of the O-ring 172 can be prevented without using a backup ring, and the O-ring 172 can be mounted with a simplified mounting structure while reducing the number of parts.

In the closed state of the flow path of FIG. 13, water from the outside tends to enter from between the enlarged diameter portion 154 of the bottom lid 151 and the lower end of the valve box portion 10. In this case, the O-ring 172 provided between the bottom lid 151 and the valve box portion 10 can reliably seal the water at one place, so that the water stopping performance can be improved.

In the case of the air valve main body 1 having the structure of FIG. 1, when water from the outside tries to enter through the gap between the bottom lid 51 and the valve box portion 10 in the closed state of the flow path of FIG. It is conceivable that this water travels between the bottom lid 51 and the valve box portion 10 and between the bottom lid 51 and the backup ring 62. In this case, the space between the bottom lid 51 and the valve box portion 10 is closed by the O-ring 61, but water advances between the bottom lid 51 and the backup ring 62, and this water is a male screw. There is a risk of intrusion from between the portion 170 and the female screw portion 171. Therefore, it may be necessary to take a water blocking measure such as a sealing agent between the male screw portion 170 and the female screw portion 171.

When the air valve main body 150 shown in FIG. 11 is initially filled with water, water mainly enters the annular groove 160 from the communication hole 161 of the bottom lid 151, and the force of water from the annular groove 160. Joins the float valve body 14. At that time, as described above, since the communication hole 161 is located below the bottom surface of the lowered float valve body 14, water pressure is applied from directly below toward the bottom surface of the float valve body 14, and this is achieved. A force that pushes up the float valve body 14 and the floating valve body 13 upward is exerted.

For this reason, even when strong water enters through the communication hole 161 at the time of initial filling, the water does not hit the float valve body 14 in the descending state from the lower surface and press against the inner surface of the sleeve 30. The running water does not hinder the buoyancy of the valve body 14. Further, since the float valve body 14 is prevented from tilting, an extra frictional force is not generated between the float valve body 14 and the sleeve 30. As a result, the operation of the float valve body 14 and the floating valve body 13 at the time of filling is not hindered, and as shown in FIG. 12, the float valve body 14 and the floating valve body 13 are smoothly moved up and filled with water. Can be done.

Moreover, since the annular groove 160 is formed concentrically on the upper surface of the base portion 152, water pressure can be evenly applied to the bottom surface of the float valve body 14 in the descending state shown in FIG. 11 through the annular groove 160. By not applying a force in the direction of tilting to the float valve body 14 and the floating valve body 13, the ascending operation can be stabilized up to the state shown in FIG.
Further, in the float valve body 14 at the time of descent in FIG. 11, since the truncated cone portion 163 is in contact with the truncated cone 162 of the bottom lid 151, the contact area between the float valve body 14 and the bottom lid 151 Can be kept small. As a result, when the float valve body 14 is about to rise, there is no possibility that the bottom surface side will adhere to the bottom lid 151, and the area of the outer periphery of the bottom portion of the float valve body 14 that receives water is widened, so that the float valve body 14 is easily floated and filled with water. Contribute to function.

When performing repair work such as inspection and cleaning on the air valve main body 150, first, the cover portion 12 is removed from the valve box portion 10 in the same manner as in the above-described embodiment.

Next, the nut member 50 is rotated in the ascending direction by a tool to raise the flange portion 40 and the sleeve 30 with respect to the valve box 20. When the sleeve 30 is raised, the upper surface 154a of the enlarged diameter portion 154 comes into contact with the lower end portion 20a of the valve box 20 to exert the lift stopper function, and the sleeve portion 11 stops at a predetermined position of the valve box 20. As a result, as shown in FIG. 13, the communication portions 24 and 25 are mutually closed, and the flow path between the air valve main body 150 and the water pipe 2 is cut off.

At this time, the O-ring 172 seals the space between the bottom lid 151 and the valve box 20, so that the communication hole 161 is blocked and water is prevented from entering the inside.
In this way, the communication portions 24 and 25 are closed, the communication holes 161 are blocked, the small air holes 13a and the large air holes 100 are closed by the float valve body 14 and the floating valve body 13, and the water pressure in the valve chamber 102 is reduced. By sealing and removing the lid 15 in this state, the floating valve body 13 and the float valve body 14 can be removed, and repair work for these parts and the inside can be performed.

In this embodiment, the bottom lid 151 is provided with a communication hole 161 and the bottom lid 151 is integrated with the female screw portion 171 of the sleeve 30 by screwing the male screw portion 170 into the communication hole 161. As long as the float valve body 14 is located below the bottom surface of the float valve body 14, the mounting structure of the bottom lid 151 and the sleeve 30 is not particular. Therefore, for example, it can be provided in various structures such as forming a communication hole on the sleeve 30 side.

1,150 Air valve body 2 Water main (external piping)
10 Valve box part 11 Sleeve part 12 Cover part 13 Floating valve body 14 Float valve body 21 Flange 24 Valve box side communication part 25 Sleeve side communication part 30 Sleeve 31, 32, 57 O-ring 35 Bolt member 35a Bolt head 35b Screw tip 36 Concave housing part 40 Flange part 40a Lower flange part 40b Upper flange part 50 Nut member

Claims (7)

A non-freezing type air valve in which a sleeve portion containing a floating valve body and a float valve body is mounted so as to be movable up and down in the valve box portion so as to block the flow path to the external pipe, and the valve box portion. the erected flange bolt member provided at the upper side, forcibly increased or lowered in a non-rotating state the sleeve portion with respect to the valve body portion in a screwed state of the bolt member, said having a large air hole communicating portion provided respectively on said valve body portion and sleeve portions mutually closed or open openable and closable a flow passage between the outer pipe Rutotomoni, the upper end opening of the sleeve portion An antifreeze type air valve characterized by being detachably attached by rotating the lid with the lid embedded . The claim that a nut member screwed to the bolt member is rotatably attached to a flange portion provided at the upper end of the sleeve portion in a position-controlled state, and the sleeve portion is moved up and down via the flange portion. The non-freezing type air valve according to 1. The non-freezing air valve according to claim 1 or 2 , wherein the bolt member is screwed in from the bottom surface side of the flange , and the bolt head of the bolt member is housed in a concave accommodating portion formed in the flange. The length of the bolt member is set so that the upper surface of the nut member and the screw tip of the bolt member are substantially the same height in a closed state of the communication portion between the sleeve portion and the valve box portion. Item 2. The non-freezing type air valve according to Item 2. The non-freezing type air valve according to any one of claims 1 to 4, wherein a cover portion that covers the valve box portion and the sleeve portion from above is fixed to the tip end side of the bolt member. The first to fifth aspects of claim 1 to 5, wherein an appropriate number of O-rings that closely seal the inner circumference of the valve box portion are attached to the outer circumference of the sleeve constituting the sleeve portion, and the periphery of the communication portion in the open state is sealed by the O-rings. The non-freezing type air valve according to any one item. The non-freezing type air valve according to any one of claims 2 to 6, wherein the flange portion is divided into upper and lower portions, and the nut member is mounted between the upper and lower flange portions in an engaged state.

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