JPH10160020A - Air valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stop leakage from a large air hole when water can not be stopped. SOLUTION: This air valve is composed to have a loose valve element 5 for opening and closing a large air hole 4 formed on the upper part of the valve box 2 and a float valve element 7 for opening and closing a small air hole 6 formed in the central part of the loose valve element 5, both valve elements 5, 7 arranged inside the valve box 2 connected to a piping through a repair valve so that they can ascend and descend. In this case, a cut-off valve element 10 for opening and closing the large air hole 4 is provided and an operating unit 11 for the cut-off valve element 10 is provided on the upper part of the valve box 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 provided in, for example, water and sewage.

[0002]

2. Description of the Related Art FIG.
There are the following. This is disposed in a manhole, for example, and a communication hole 3 communicating with the repair valve 1 is formed in a lower portion of a valve box 2 connected to a pipe (not shown) such as water supply and sewage via a repair valve 1. At the same time, a large air hole 4 is formed in the upper part of the valve box 2, and a guide cylinder 2 a is disposed concentrically with the large air hole 4 in the valve box 2. A floating valve element 5 for opening and closing the air hole 4;
And a float valve element 7 for opening and closing a small air hole 6 formed at the center of the valve. A cover 8 covers the large air hole 4.

[0003] In the above configuration, the repair valve 6 is opened to allow pressurized water to flow into the valve box 2 from the pipes such as water and sewage through the communication port 3 so as to move freely as shown by phantom lines in FIG. While the large air hole 4 is closed by the valve element 5,
The small air hole 6 is closed by the float valve element 7, and in this closed state, air accumulates in the valve box 2, the water level in the valve box 2 decreases, and the float valve element 7 has a smaller force than the force for pushing up the float valve element 7. When the weight of the valve body 7 becomes larger, the float valve body 7 is lowered and separated from the small air hole valve seat 6a, whereby the inside of the valve box 2 communicates with the outside air through the small air hole 6 and the valve box 2 Automatically discharges air that has accumulated inside.

[0004]

In the above configuration, for example, if dirt or the like is caught between the large air hole valve seat 4a and the floating valve body 5 and the water cannot be stopped, the water leaking from the large air hole 4 causes the air to leak. It will collect in the manhole where the valve is installed.
In this case, in order to stop the water leakage, it is necessary to close the repair valve 1 in which a worker enters the manhole where the water leakage continues and is submerged, which takes time and labor.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide an air valve which can stop water leakage from a large air hole when water cannot be stopped.

[0006]

In order to achieve the above object, the present invention provides a valve box connected to a pipe via a repair valve for opening and closing a large air hole formed in an upper portion of the valve box. A water stop valve for opening and closing the large air hole in an air valve in which an idle valve element and a float valve element for opening and closing a small air hole formed in a central portion of the idle valve element are arranged to be movable up and down. A body is provided, and an operation part of the water stop valve body is provided above the valve box.

[0007] In the above configuration, at the beginning of water flow, the floating valve element and the float valve element are located below the valve box and open large air holes. When water flows into the valve box, the float valve body floats and pushes up the floating valve body to close the large air hole.

When a pressure fluctuation occurs in the piping by a water hammer or the like after the floating valve element closes the large air hole, the atmospheric pressure prevails and the floating valve element moves downward in a phase in which the inside of the valve box becomes a negative pressure. In the phase where the pressure in the valve box becomes positive after that, the pressure in the valve box pushes up the floating valve element to close the large air hole. Depending on the state of the pressure fluctuation, the floating valve body repeats up and down movement.

Normally, the large air hole is closed by the floating valve body and the small air hole is closed by the float valve body. In this closed state, air accumulates in the valve box, the water level in the valve box drops, and when the weight of the float valve body becomes larger than the force pushing up the float valve body, the float valve body descends and small air holes It separates from the valve seat, communicates with the outside air through the small air holes, and automatically discharges the air accumulated in the valve box.

If, for example, debris is caught between the large air hole valve seat and the floating valve body and water cannot be stopped, water leaking from the large air hole accumulates in the manhole where the air valve is installed. However, in this case, the operating section is operated to close the large air hole with the water stop valve to stop water leakage. Subsequently, after pumping out the water accumulated in the manhole, the worker enters the manhole, closes the repair valve, and stops the flow of the pressurized water into the valve box. Subsequently, the water valve is separated from the large air hole, dust and the like sandwiched between the large air hole valve seat and the floating valve body are removed, and the repair valve is opened, whereby the air valve is restored. Can be returned to the normal state.

In this case, for example, dirt or the like is caught between the large air hole valve seat and the floating valve body, so that water cannot be stopped. Water leaking from the large air hole accumulates in the manhole where the air valve is installed. However, the water leakage can be easily stopped by operating the operation unit from above the valve box and closing the large air hole by the water stop valve body.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an air valve according to an embodiment of the present invention, in which a water shutoff valve seat 4b is formed by extending a peripheral upper portion of a large air hole 4 upward.
A water stop valve body 10 for opening and closing the large air hole 4 is provided in contact with and separated from the valve b, and an operation unit 11 of the water stop valve body 10 is provided above the valve box 2. In the configuration other than the above, the same parts as those of the conventional example shown in FIG.

The operating portion 11 has a threaded rod 15 screwed into a nut 14 which is non-rotatably fitted in a recess 13 formed in a support frame 12 erected on the upper surface of the valve box 2. The water stop valve body 10 is connected to the lower end of the
An operation member 16 is provided above the screw rod 15, a holding member 17 for a nut 14 is attached to the support frame 12, and a cover 18 is fitted over a flange portion 12 a protruding from the outer peripheral surface of the support frame 12. I have.

In the above configuration, as shown by the imaginary line in FIG. 1, in the initial stage of water passage, the floating valve element 5 and the float valve element 7 are located below the valve box 2 to open the large air hole 4. It is in. When the repair valve 1 is opened and water flows from the pipes such as water and sewage to the inside of the valve box 2, the float valve 7 floats and pushes up the floating valve 5 to close the large air hole 4.

After the floating valve element 5 closes the large air hole 4,
When a pressure fluctuation occurs in the piping due to a water hammer or the like, in a phase in which the inside of the valve box 2 becomes a negative pressure, the atmospheric pressure prevails and pushes the floating valve element 5 downward. In this phase, the pressure in the valve box pushes up the floating valve element 5 to close the large air hole 4. Depending on the state of the pressure fluctuation, the floating valve element 5 repeats up and down movement.

Normally, the large air hole 4 is closed by the floating valve element 5 and the small air hole 6 is closed by the float valve element 7. In this closed state, air accumulates in the valve box 2 and the water level in the valve box 2 drops, and the weight of the float valve element 7 is greater than the force of pushing up the float valve element 7. When it becomes larger, the float valve element 7 is lowered and separated from the small air hole valve seat 6a, whereby
The inside of the valve box 2 communicates with the outside air through the small air holes 6, and the air accumulated in the valve box 2 is automatically discharged.

The large air hole valve seat 4a and the floating valve body 5
If water cannot be stopped because dust or the like is caught between the air holes, water leaking from the large air hole 4 will accumulate in the manhole where the air valve is installed.
As shown by the solid line in FIG. 1, the water stop valve body 10 is pressed against the water stop valve seat 4b to close the large air hole 4 and stop water leakage.

In this case, even when the air valve in the manhole is submerged, the large air hole 4 is closed by the water shutoff valve 10 simply by rotating the screw rod 15 provided above the valve box 2. To easily stop water leakage.

Subsequently, after pumping out the water accumulated in the manhole, the worker enters the manhole, closes the repair valve 1, and stops the flow of the pressurized water into the valve box 2. continue,
By reversing the screw rod 15, the water stop valve body 10 is
b (see the phantom line in FIG. 1), and the large air hole valve seat 4a
The air valve can be returned to the original normal state by removing dust and the like sandwiched between the air valve and the floating valve body 5 and opening the repair valve 1.

[0020]

According to the present invention, for example, dirt or the like is interposed between the large air hole valve seat and the floating valve body so that water cannot be stopped.
Even if water leaking from the large air hole accumulates in the manhole where the air valve is installed, operating the operation unit from above the valve box closes the large air hole with the water shutoff valve body to easily leak water You can stop it. Further, since only the upper structure of the existing air valve needs to be changed slightly, the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an air valve according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Repair valve 2 Valve box 4 Large air hole 5 Idle valve 6 Small air hole 7 Float valve 10 Water stop valve 11 Operation part

Claims (1)

[Claims] 1. A floating valve body for opening and closing a large air hole formed in an upper portion of the valve box in a valve box connected to a pipe via a repair valve, and a floating valve body formed in a central portion of the floating valve body. In an air valve in which a float valve body for opening and closing the small air hole is arranged so as to be able to move up and down, a water stop valve body for opening and closing the large air hole is provided, and an operation unit of the water stop valve body is An air valve provided above a valve box.