JPH10169816A - Air valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To discharge a large volume of air when the discharging volume is too large by piercing an auxiliary hole in a side wall of a valve casing, and fitting an opening/closing valve to the auxiliary hole in a system where a small air hole formed in a center part of a loose valve disk to open/close a large air hole formed in an upper part of the valve casing. SOLUTION: When water flows into a valve casing 1 from pipes for water/ sewage works through a communication hole 2, a large air hole 3 is closed by a loose valve disk 4, and a small air hole 5 is closed by a float valve disk 6. When the weight of the float valve disk 6 is larger than the force to push up the float valve disk 6, and the float valve disk 6 is detached from a valve seat 5a of the small air hole 5 to evacuate the air inside a valve casing 1. Because the volume of the air to be evacuated is excessive, the loose valve disk 4 is involved in the air flow during evacuation, and floated, and if the large air hole 3 is closed, a ball valve 12 is turned to open an auxiliary hole 9. The air inside the valve casing 1 is evacuated from the auxiliary hole 9 through a hydrant 10, and air evacuation is rapidly completed.

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 because a communication hole 2 communicating with the pipe is formed at a lower part of the valve box 1 connected to a pipe (not shown) such as water supply and sewage, and a large air hole 3 is formed at an upper part of the valve box 1. A guide cylinder 1a is disposed concentrically with the large air hole 3 in the valve box 1, and a floating valve body 4 for opening and closing the large air hole 3 is provided in the guide cylinder 1a. A float valve body 6 for opening and closing a small air hole 5 formed in the center of the body 4 is provided so as to be able to move up and down. Reference numeral 7 denotes a cover that covers the large air hole 4.

[0003] In the above construction, by allowing water to flow into the valve box 1 through the communication port 2 from pipes such as water and sewage, as shown by the phantom line in FIG. Is closed, and the small air hole 5 is closed by the float valve body 6. In this closed state, air accumulates in the valve box 1, the water level in the valve box 1 drops, and the force to push up the float valve body 6. When the weight of the float valve body 6 is larger than that of the float valve body 6, the float valve body 6 is lowered and separated from the small air hole valve seat 5a, and the inside of the valve box 1 communicates with the outside air through the small air hole 5; The air accumulated in the valve box 1 is automatically discharged.

[0004]

In the above configuration, when the amount of exhaust gas is too large, the floating valve element 4 is entrained in the airflow and rises in the middle of exhausting, and the large air hole 3 is closed. Can be exhausted only, and it may take time to exhaust.

Therefore, for example, Japanese Utility Model Application Laid-Open No. 52-93296.
As described in the publication, when a fire hydrant is integrally formed in the valve box 1 and the large air hole 3 is closed by the floating valve element 4 due to excessive displacement, the fire hydrant is opened and the fire hydrant is opened. However, in this case, it is necessary to manufacture an air valve with a fire hydrant of a special shape, and the manufacturing cost is high.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide an air valve that can exhaust a large amount when the amount of exhaust is too large and can reduce the manufacturing cost.

[0007]

In order to achieve the above object, the present invention provides a floating valve body for opening and closing a large air hole formed in an upper part of a valve box in a valve box connected to piping. An air valve in which a float valve body for opening and closing a small air hole formed in a central portion of the floating valve body is arranged so as to be able to move up and down.
An auxiliary hole is provided in a side wall of the valve box, and an on-off valve is attached to the auxiliary hole.

[0008] In the above construction, the large air hole is closed by the floating valve body and the small air hole is closed by the float valve body by flowing water into the valve box from piping such as water and sewage. In this state, when air accumulates in the valve box, the water level in the valve box decreases, and the weight of the float valve body is greater than the force pushing up the float valve body,
The float valve body is lowered and separated from the small air hole valve seat,
The inside of the valve box communicates with the outside air through the small air holes, and the air accumulated in the valve box is automatically discharged.

When the amount of exhaust is too large, the floating valve element is entrained in the airflow during the exhaust and rises to close the large air hole, and the exhaust can only be exhausted from the small air hole. In such a case, the on-off valve attached to the auxiliary hole may be opened. As a result, a large amount of air accumulated in the valve box is discharged to the outside from the auxiliary hole, and the exhaust can be quickly terminated.

In addition, the auxiliary hole is formed in the side wall of the valve box, and the on-off valve is simply attached to the auxiliary hole. It is only necessary to make a slight change to the existing air valve. Can be.

[0011]

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.
And a fire hydrant 10 is attached to the auxiliary hole 9. In the configuration other than the above, the same parts as those of the conventional example shown in FIG.

The fire hydrant 10 has a plug body 10a formed of a substantially L-shaped tube, and a flange portion 10b integrally formed at the base end of the plug body 10a is provided with an O-ring 11 for the valve box 1. A hose connection port 10c is fixed to the side wall and provided at the end of the plug body 10a via a ball valve (open / close valve) 12. A cap 13 is attached to the hose connection port 10c.

In the above configuration, with the ball valve 12 of the fire hydrant 10 closed (see the solid line in FIG. 1), water is introduced into the valve box 1 from piping such as water and sewage to obtain the structure shown in FIG.
As shown by an imaginary line, the large air hole 3 is closed by the floating valve body 4 and the small air hole 5 is closed by the float valve body 6, and in this closed state, air accumulates in the valve box 1. When the water level in the valve box 1 decreases and the weight of the float valve body 6 becomes larger than the force for pushing up the float valve body 6, the float valve body 6 is lowered and the small air hole valve seat 5a
, Whereby the inside of the valve box 1 communicates with the outside air through the small air holes 5, and the air accumulated in the valve box 1 is automatically discharged.

When the amount of exhaust is too large, the floating valve element 4 is entrained in the airflow during the exhaust and floats up, closing the large air hole 3 and exhausting only from the small air hole 5. If it takes a long time to exhaust the gas, the auxiliary valve 9 may be opened by rotating the ball valve 12 by 90 °. As a result, the air collected in the valve box 1 is removed from the auxiliary hole 9 through the fire hydrant 1.
The exhaust can be quickly terminated by discharging a large amount to the outside through zero.

An auxiliary hole 9 is provided in the side wall of the valve box 1 to
Since only the fire hydrant 10 with the ball valve 12 is attached to the auxiliary hole 9 and only a slight change needs to be made to the existing air valve, the manufacturing cost can be reduced.

When performing a fire fighting operation, the hose connection port 1
Remove the cap 13 from the hose connection port 10c.
After connecting a fire extinguishing hose (not shown) to c, the ball valve 12 may be opened. Thereby, pressurized water can be supplied from the inside of the valve box 1 to the fire hose through the auxiliary hole 9 and the fire hydrant 10.

Further, water can be taken out using the fire hydrant 10.

[0018]

According to the present invention, by opening the on-off valve attached to the auxiliary hole when the displacement is too large,
A large amount of air accumulated in the valve box is discharged to the outside from the auxiliary hole, and the exhaust can be quickly terminated.

In addition, since the auxiliary hole is formed in the side wall of the valve box and the on-off valve is simply attached to the auxiliary hole, it is only necessary to make a slight change to the existing air valve. Can be.

[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 Valve box 3 Large air hole 4 Floating valve element 5 Small air hole 6 Float valve element 9 Auxiliary hole 12 Ball valve (open / close valve)

Claims (1)

[Claims] 1. A floating valve body for opening and closing a large air hole formed in an upper part of the valve box in a valve box connected to a pipe, and a small air hole formed in a central portion of the floating valve body for opening and closing. In a pneumatic valve in which a float valve body for moving up and down is arranged,
An air valve, wherein an auxiliary hole is provided in a side wall of the valve box, and an on-off valve is attached to the auxiliary hole.