JP2000230655A - Mounting structure of air valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the protrusion of a valve box into a conduit by forming connection flanges on the upper circumference of the valve box and the upper opening circumference of a riser opposite to each other, respectively, and installing a connection short pipe for preventing the valve box lower end from protruding into the conduit between both the connection flanges. SOLUTION: An air valve 1 is formed of a valve box 3 having a float chamber 2 in the inner part, a valve element part 4 provided in the upper part of the valve box 3, a cap 5 covering the valve element part 4, a float 6 housed within the float chamber 2 in such a manner as to be vertically movable, and a free valve element 7. The valve box 3 has a connection flange 8 on the body circumference, and this flange 8 is connected to the connection flange 13 of a riser 12 integrated to a conduit 11 to mount the air valve 1 on the conduit 11. At this time, when the height H of the riser 12 is smaller than the length L of the valve box 3, a connection short pipe 21 is interposed between both the connection flanges 8, 13 to perform the mounting of the air valve 1, so that the valve box 3 never protrudes into the conduit 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for mounting an air valve, and more particularly, to a structure for mounting an antifreeze type air valve having a structure for preventing freezing of a fluid in a valve box to a pipe line. .

[0002]

2. Description of the Related Art Conventionally, water or the like mixed in a fluid flowing in a pipeline has been discharged into a pipeline such as a water supply system.
An air valve is provided for sucking air into the pipeline when discharging the fluid in the pipeline. This air valve generally accommodates a float in a float chamber formed at a lower portion of a valve box so as to be able to move up and down, and activates a valve element provided at an upper portion of the valve box by the up and down movement of the float, thereby discharging air or the like. It is configured to perform inhalation.

[0003] Further, in an air valve used in a cold region, a fluid flowing in a pipe is always in contact with a valve box in order to prevent the fluid in the air valve from freezing and damaging the air valve. To prevent freezing in the valve box by the thermal energy of the fluid. An air valve (antifreeze-type air valve) having such an antifreeze structure is usually attached to a pipeline by inserting a valve box projecting from a lower portion of the air valve into a rising pipe provided in the pipeline. .

[0004]

However, in the conventional antifreeze air valve mounting structure, if the height of the riser pipe provided in the pipeline is low, the lower end of the valve box of the air valve protrudes into the pipeline. There was a thing. In this case, the original function of the air valve and the function of preventing freezing are not impaired, but this not only increases the flow resistance of the fluid, but also hinders the cleaning and inspection of the pipeline.

Therefore, according to the present invention, an air valve, particularly an antifreeze type air valve, can be mounted without protruding the valve box into the pipeline even when the height of the riser pipe provided in the pipeline is low. An object of the present invention is to provide an air valve mounting structure.

[0006]

In order to achieve the above object, an air valve mounting structure according to the present invention is provided by vertically moving a float housed vertically in a float chamber below a valve box.
A structure for mounting an air valve for opening and closing a valve body provided at an upper portion of a valve box to discharge air in a fluid flowing through a pipe at an upper opening of a riser pipe provided at the pipe,
Connection flanges are provided on the outer periphery of the upper portion of the valve box and the outer periphery of the upper opening of the riser tube so as to face each other, and the lower end portion of the valve case when the air valve is mounted is connected between the connection flanges. It is characterized in that a connecting short tube for preventing it from protruding into the road is attached.

[0007] In particular, in the air valve mounting structure of the present invention, the connecting short pipe is provided on an upper contact portion abutting on a lower surface of the connecting flange of the air valve valve box and on an upper surface of the connecting flange of the riser pipe. A lower contact portion to be contacted, a telescopic tube portion capable of adjusting an interval between the upper contact portion and the lower contact portion in the axial direction, and a predetermined interval between the upper contact portion and the lower contact portion. It is characterized by having a spacing member for fixing in size.

[0008]

FIG. 1 is a sectional view showing a first embodiment of an air valve mounting structure according to the present invention. First, the air valve 1
A valve box 3 having a float chamber 2 therein, a valve body 4 provided on an upper portion of the valve box 3, and a cap 5 covering the valve body 4
And a float 6 and a floating valve 7 housed in the float chamber 2 so as to be movable up and down.
A connection flange 8 for attaching the air valve 1 to a pipe is provided on the outer periphery of the body.

On the other hand, a T-shaped pipe is used for a pipe 11 such as a water pipe in correspondence with an air valve mounting part, and a branch pipe part thereof is installed as a rising pipe 12 in a vertical direction. A connection flange 13 for pipe connection is provided on the outer periphery of an upper end portion of the riser pipe 12. The connection flange 8 of the air valve 1 is formed in a shape connectable to the connection flange 13. ing.

That is, in a normal case (when the riser pipe 12 has a sufficient height), the connection flange 8 of the air valve 1 is directly connected to the connection flange 13 of the riser pipe 12 and bolted. The air valve 1 can be attached to the conduit 11.

The discharge of air in the pipeline from the air valve 1, for example, a small amount of air, is performed through a through hole 3a at the bottom of the valve box, a through hole 2a at the bottom of the float chamber, and a through hole 2b at the top. The float 6 is lowered by the air flowing into the float chamber, and the through hole 7a of the floating valve body 7 is opened. In this state, the space between the outer periphery of the valve box 3 and the inner periphery of the riser pipe 12 is filled with air.
Is constantly in contact with the fluid flowing through the pipeline,
Freezing of the air valve 1 is prevented. A large amount of air is discharged or sucked by the float 6 descending together with the floating valve body 7 to fully open the valve body portion 4.

[0012] Then, as shown in FIG.
When the height H (dimension from the upper surface of the connection flange 13 to the inner surface of the conduit) H is smaller than the length L of the valve box 3 (dimension from the lower surface of the connection flange 8 to the lower end of the valve box) L, A short pipe 21 having a suitable length between the connection flanges 8 and 13.
Is mounted, and the air valve 1 is mounted with the short connecting pipe 21 interposed between the rising pipe 12 and the connecting flange 13. At this time, by selecting the connecting short pipe 21 having an appropriate length, the lower end of the valve box 3 does not protrude into the pipe line 11 and the thermal energy of the fluid is sufficiently transmitted to the valve box 3. The air valve 1 can be mounted at a position where

Although the shape of the connecting short pipe 21 is arbitrary, a pipe body 22 having an inner diameter equal to the inner diameter of the riser pipe 12 and a flange contact portion provided on the outer periphery of both ends of the pipe body 22 are provided. 23 and 24. The flange contact portions 23 and 24 can be formed in an appropriate shape as long as the air valve 1 can be attached to the riser pipe 12 in a stable state. In addition, both flange contact portions 2
The connecting flanges 3 and 24 may be formed in the same shape as the connecting flanges 8 and 13, but as shown in FIG. By forming the flange contact portion 24 with a smaller diameter than the bolt insertion portion, sufficient stability can be obtained while improving manufacturability and workability at the time of mounting the air valve.

FIGS. 2 and 3 show a second embodiment of the present invention. FIG. 2 is a sectional view of a main part, and FIG. 3 is an exploded perspective view of a spacing member. In this embodiment, the connection short pipe 31 mounted between the riser pipe 12 and the air valve 1 is connected to an upper contact portion 32 that abuts on the lower surface of the connection flange 8 of the air valve 1, and is connected to the riser pipe 12. A lower contact portion 33 that contacts the upper surface of the flange 13, a telescopic tube portion 34 in which the distance between the upper contact portion 32 and the lower contact portion 33 can be adjusted in the axial direction, and an upper contact portion. An interval holding member 35 for fixing the interval between the lower contact portion 32 and the lower contact portion 33 at a predetermined size is prepared.

The telescopic tube portion 34 is integral with the lower contact portion 33 and has an inner diameter substantially the same as the riser tube 12, and is integral with the upper contact portion 32 and has an inner diameter substantially equal to the outer diameter of the inner tube 34a. And an outer tube 34b. The inner tube 34a is slidable in the axial direction via a liquid-tight packing 36 so as to be slidable in the axial direction.
4b.

As shown in FIG. 3, the spacing member 35 comprises a pair of comb-shaped blocks 37 having a bolt insertion hole 35a. By combining the tooth-shaped concave portion 37a and the convex portion 37b, the height dimension of the spacing member 35 can be set in a plurality of steps.

Therefore, by adjusting the height of the spacing member 35 in accordance with the height (H) of the riser pipe 12 for mounting the air valve 1 and the size (L) of the valve box 3,
The dimension between the connection flanges 8 and 13 can be adjusted, and the lower end portion of the valve box 3 can be installed at a position close to the inside of the pipe within a range not protruding into the pipe 11. Thus, the air valve 1 can be mounted at a position with a high anti-freezing effect without increasing the flow resistance of the fluid and without obstructing the cleaning and inspection of the pipeline 11.

Further, as shown in FIG. 4, the comb-like block 37 of the spacing member may be provided with a groove 35b for inserting a bolt in place of the bolt insertion hole 35a.
Furthermore, a plate-like member having such a bolt insertion hole or a groove may be stacked in the axial direction of the bolt to maintain the interval. As shown in the cross-sectional view of FIG. 5, a telescopic tube portion of the connecting short tube 31 that connects the upper contact portion 32 and the lower contact portion 33 so as to be able to expand and contract is capable of expanding and contracting like a bellows tube 38. It can also be formed by a tube. Further, the spacing between the upper contact portion 32 and the lower contact portion 33 can be maintained by a so-called double nut method.

The structure of the air valve which is the object of the present invention is arbitrary, and is not limited to the structure shown in FIG. 1, but can be applied to air valves having various structures, especially antifreeze type air valves. The description of the detailed structure of the air valve and the operation of discharging air in the pipeline or sucking air into the pipeline will be omitted.

[0020]

As described above, according to the air valve mounting structure of the present invention, the air valve, especially the antifreeze type air valve, can be installed without increasing the flow resistance of the fluid, It can be mounted at a position with a high anti-freezing effect without obstructing cleaning and inspection.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of an air valve mounting structure according to the present invention.

FIG. 2 is a cross-sectional view of a main part, similarly showing a second embodiment.

FIG. 3 is an exploded perspective view showing an example of a shape of a spacing member.

FIG. 4 is an exploded perspective view showing another example of the shape of the spacing member.

FIG. 5 is a sectional view showing another example of the shape of the telescopic tube.

[Explanation of symbols]

1 ... air valve, 2 ... float chamber, 3 ... valve box, 4 ... valve body,
DESCRIPTION OF SYMBOLS 5 ... Cap, 6 ... Float, 7 ... Floating valve element, 8 ... Connection flange, 11 ... Pipe line, 12 ... Rise pipe, 13 ... Connection flange, 21 ... Connection short pipe, 22 ... Pipe body part, 2
3, 24 ... flange contact portion, 31 ... short pipe for connection, 32 ...
Upper contact part, 33 ... Lower contact part, 34 ... Telescopic tube part, 35
... spacing member, 36 ... liquid-tight packing, 37 ... comb-shaped block, 38 ... bellows tube

Claims (2)

[Claims] 1. A valve body provided in an upper portion of a valve box is opened and closed by a vertical movement of a float accommodated in a float chamber below the valve box so as to be movable up and down, thereby discharging air in a fluid flowing through a pipe. A structure for attaching an air valve to an upper opening of a riser pipe provided in the conduit, wherein a connection flange is opposed to an upper outer periphery of the valve box and an outer periphery of an upper opening of the riser pipe, respectively. Mounting the air valve between the connection flanges so as to prevent a lower end of the valve box from protruding into the pipe when the air valve is mounted. Construction. 2. The connecting short pipe includes an upper contact portion that contacts an under surface of a connection flange of an air valve valve box, a lower contact portion that contacts an upper surface of a connection flange of a rising pipe, and an upper contact portion. An interval holding member for fixing the interval between the upper contact portion and the lower contact portion with a predetermined dimension while having a telescopic tube portion capable of adjusting the interval between the contact portion and the lower contact portion in the axial direction. The air valve mounting structure according to claim 1, wherein the air valve mounting structure is provided.