JP2002357282A - Air valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air valve capable of applying the valve to the embedding in a sharrow layered spot with its height reduced. SOLUTION: The air valve comprises a valve chamber 2 having an inlet port 2A communicating with a conduit 1, float 3 contained in the valve chamber 2 and valve body 7 fitted on the upper part of the float 3 to open/shut a valve port 9A by the ascending/descending motion of the float 3, thereby allowing the outside (the air) to communicate with/shut the inside of the valve body 7. The valve chamber 2 of this air valve is equipped inside the valve chamber 2 with a repairing valve 14 to open/shut the inlet port 2A of the valve chamber 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air valve for sucking / exhausting a water pipe such as a sewage pressure feed pipe, and more particularly to an air valve which can be applied to a shallow burial.

[0002]

2. Description of the Related Art Conventionally, an air valve shown in FIG. 5 has been known as an air valve attached to a water pipe through a repair valve necessary for maintenance and inspection in order to suck and exhaust a water pipe such as a sewage pressure feed pipe. Have been. The pneumatic valve includes a valve box 2 mounted in communication with a water pipe 1 through a repair valve necessary for maintenance and inspection, which will be described later, a float 3 housed inside the valve box 2, and a flow valve.
A valve stem 4 attached to the valve 3 and extending upward;
And a valve element 7 connected to the upper side of the valve rod 4 with a relative movement amount substantially corresponding to the length of the long hole 6 in the vertical direction. The valve body 7 is integrally provided with a hollow shaft portion 7A provided with a small air hole 7a at a lower end portion, extends upward, and is located in a valve box cover 8 detachably mounted on the upper portion of the valve box 2. are doing. Also, valve box cover-8
A sheet receiver 9 is mounted on the upper part of the seat.
An annular seal member 7b attached to the upper surface of the valve body 7 faces a downward valve seat 9B in the periphery of the valve hole 9A.

[0003] An exhaust chamber 10 communicating with the atmosphere through an exhaust port 10a is formed in the sheet receiver 9, and a diaphragm device 11 is mounted on an upper portion thereof. The hollow shaft portion 7A is connected to the exhaust chamber 10 of the sheet receiver 9 through the valve hole 9A.
The diaphragm 11A is attached to the upper end of the diaphragm device 11 slidably, and is constantly urged by a spring 12 in the valve closing direction (upward). The upper pressure chamber 11B of the diaphragm device 11 communicates with the atmosphere via an air nozzle 11b. The diaphragm device 11 is air-tightly covered by a cover 13, and the inside of the cover 13 has a ventilation hole 13A.
Is in communication with the atmosphere through

On the other hand, between the water pipe 1 and the valve box 2, a repair valve 14 made of, for example, a ball valve or a butterfly valve is provided.
The repair valve 14 is closed and the inside of the valve box 2 is cut off from the water pipe 1, whereby the air valve is connected to the water pipe 1.
It is designed so that maintenance and inspection can be performed without removing it from the device.

[0005] According to the air valve of the above construction, when the piping of the water pipe 1 is completed with the repair valve 13 opened, as shown in FIG. The seal member 7b is raised by the spring force of the spring 12, and is held in a closed state in which the seal member 7b is in close contact with the valve seat 9B of the sheet receiver 9. Therefore, the air in the water pipe 1 is transferred from the valve box 2 to the valve body 7.
Into the upper pressure chamber 11B of the diaphragm device 11 through the small air hole 7a, and exhaust from here through the air nozzle 11b and the ventilation hole 13A of the cover 13 (initial exhaust).
Is done.

[0006] By the work of filling the water pipe 1, the water pipe 1
When the air pressure in the valve box 2 increases, the pressure chamber 11B also increases in pressure, depresses the diaphragm 11A against the spring force of the spring 12, and also depresses the valve body 7 via the pin 5, as shown in FIG. The seal member 7b of the valve body 7 is a seal.
The valve 9 is in an open state apart from the valve seat 9B. Thereby, the inside of the valve box 2 has the valve hole 9A, the exhaust chamber 10, and the exhaust port.
10a and the path of the ventilation hole 13A of the cover 13 communicate with the atmosphere. .

When the sewage enters the valve box 2, the float 3 rises due to buoyancy, and closes the small air hole 7 a of the valve body 7 at the upper end of the valve rod 4 to push up the valve body 7. Therefore, as shown in FIG. 7, the valve hole 9A is closed, and the valve is closed (filled water closed) in which air is trapped in the air pool 15 in the valve box 2. When the air mixed with the sewage in the water pipe 1 enters the valve box 2 after the valve is closed in this manner, the air pool 1
The pressure of 5 rises and lowers the sewage level in the valve box 2. For this reason, the draft of the float 3 is lowered, and the buoyancy of the float 3 is reduced by the reduced draft and lowered. , And the pressure is exhausted.

When the pressure inside the valve box 2 becomes negative due to the drainage of the water pipe 1, the exhaust port 10a, the exhaust chamber 10, and the valve hole 9A.
At this time, the atmospheric pressure is applied to the valve element 7 to push down the valve element 7, so that a large amount of air is sucked as shown by the arrow in FIG.

[0009]

However, in the conventional air valve, since the height H shown in FIG. 5 is a large value obtained by adding the height h2 of the repair valve 13 to the height h1 of the main body, it is frequently used in recent years. However, there is a problem that the method cannot be applied to the shallow burial that tends to occur.

[0010] Therefore, an object of the present invention is to provide an air valve which is reduced in height and which can be applied to a shallow buried layer.

[0011]

In order to achieve the above object, an air valve according to the present invention comprises a valve box having an inlet communicating with a water pipe, and a float housed in the valve box. The valve hole is closed by the valve body mounted on the upper part of the float and the valve body pushed up by the float rising in the valve box to shut off the inside and outside of the valve box. A pneumatic valve configured such that a valve hole is opened by a valve body pulled down by a float descending in the valve box to communicate the inside and outside of the valve box. It is equipped with a repair valve that opens and closes the inlet.

According to the present invention, since the repair valve for opening and closing the inlet of the valve box is provided inside the valve box, the height of the air valve can be reduced by an amount corresponding to the height of the conventional repair valve. Therefore, it can be applied to shallow burial.

[0013]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along line AA of FIG.
The same parts as those in the conventional example shown in FIGS. 5 to 8 are denoted by the same reference numerals, and redundant description of the structure and operation will be omitted.

1 and 2, a repair valve 14 for opening and closing an inlet 2A of the valve box 2 is provided inside the valve box 2. That is, the repair valve 14 includes a valve body 14A, and an inner valve stem 14B and an outer valve stem 14C attached to both ends of the valve body 14A so as to have the same axis C. The cross-sectional shape in the C direction has a hemispherical shape, and the cross-sectional shape in the direction orthogonal to the axis C has an arc shape having the same curvature as the hemispherical curvature. Also,
The inner valve stem 14B is inserted into a support hole 2B provided in the valve box 2 so as to be freely rotatable around the axis C.
Extends through the support hole 2C in a rotatable and airtight manner around the axis C and extends to the outside, and an opening / closing operation handle 15 is attached to the extending end.

At the inlet 2A of the valve box 2, an annular valve box sheet 16 to which the outer surface of the valve body 14A comes and goes is attached. The annular valve box sheet 16 is made of an elastic body such as rubber, and has an annular seat retainer 17 screwed into a rear end portion of the inlet 2A.
By the sheet receiver 18 screwed into the opening of the entrance 2A,
The packing 19 is attached to the sheet receiver 18 with the packing 19 disposed therebetween. In addition, the annular valve box sheet 16
Does not necessarily need the packing 19 when is made of an elastic material such as rubber.

With such a configuration, FIGS. 1 and 2
By closing the repair valve 14 and shutting off the inside of the valve box 2 from the water pipe 1 as described above, maintenance and inspection can be performed without removing the air valve from the water pipe 1. In addition, by opening the repair valve 14 as shown in FIG. 3 by operating the opening / closing operation handle 15, the inside of the valve box 2 is communicated with the water pipe 1 so that the exhaust function of the air valve can be exhibited.

On the other hand, since the repair valve 14 is provided inside the valve box 2, the height H1 of the air valve is suppressed to the same height as the height h1 of the main body of the conventional air valve shown in FIG. be able to. That is, compared to the height H of the conventional air valve,
Since the height H1 of the air valve of the present invention can be reduced by the height h2 of the repair valve 13, the present invention can be applied to a shallow-layer burial that tends to be used frequently in recent years.

As shown in FIG. 4, the valve element 14 of the repair valve 14
A, a cross section in a direction orthogonal to the axis C is formed in a substantially hemispherical shape having the same curvature as the hemispherical cross section in the direction of the axis C, and the through hole 20 is provided so as to be deviated laterally.
When the repair valve 14 is opened as shown in the figure, the wire mesh 21 functions as a filter so that solid matter mixed in the water flowing through the water pipe 1 enters the valve box 2. This can prevent the air valve from malfunctioning. Although the annular valve box sheet 16 made of an elastic material such as rubber is used, an annular valve box sheet (metal sheet) 16 made of metal may be used. In this case, it is necessary to interpose a packing 19 between the annular valve box sheet 16 and the seat receiver 18.

In the above-described embodiment, the description has been made using the air valve for sucking / exhausting the sewage pressure feed pipe.
The present invention can be applied not only to an air valve that suctions and exhausts a sewage pressure pipe, but also to an air valve that sucks and exhausts a water pressure transmission pipe and an agricultural water pressure pipe.

[0020]

As described above, since the air valve of the present invention is constituted, the following special effects can be obtained.

That is, since the repair valve that opens and closes the inlet of the valve box is provided inside the valve box, the height of the air valve can be reduced by a value corresponding to the height of the conventional repair valve.
Therefore, the present invention can be applied to a shallow layer buried which has been frequently used in recent years.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along the line AA of FIG.

FIG. 3 is an explanatory view showing a valve open state of FIG. 2;

FIG. 4 is an enlarged sectional view showing a modified example of the valve element.

FIG. 5 is a longitudinal sectional view of a conventional example.

FIG. 6 is an enlarged sectional view showing a large amount of exhaust under pressure and an exhaustion under pressure.

FIG. 7 is an enlarged cross-sectional view showing a water filling closed state.

FIG. 8 is an enlarged sectional view showing an intake state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water pipe 2 Valve box 2A inlet 3 Float 7 Valve 9A Valve hole 14 Repair valve

Claims (1)

[Claims] A valve box having an inlet communicating with a water pipe;
A float housed in the valve box, a valve element mounted on an upper portion of the float, and a flow rising in the valve box.
The valve hole is closed by the valve body pushed up by the valve to shut off the inside and the outside of the valve box, and the valve hole is opened by the valve body lowered by the float descending in the valve box. An air valve configured to communicate between the inside and the outside of the air valve, wherein a repair valve for opening and closing an inlet of the valve box is provided inside the valve box.