JPH0932949A - Air valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air valve which does not disturb smooth flow of fluid in a pipe even when the air valve is arranged on a siphon pipe. SOLUTION: In an air valve 11 formed in such a manner that a large air hole 4 is formed in an upper end part and at a lower part, a floating valve body 9 to open and close the large air hole 4 is elevatably disposed in a valve casing 3 communicating with a piping 2, a cover body 13 to open and close the large air hole 4 from above is arranged at the upper end part of the valve casing 3. This constitution performs suction and exhaust by opening a cover body 13 where occasion demands, such as a discharge time, and performs no automatic suction and exhaust by closing the cover body 13 during a normal operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air valve installed in industrial piping or the like.

[0002]

2. Description of the Related Art The role of an air valve is to automatically perform the discharge of air in a pipeline when refilling water, the supply of air to the pipeline when draining water, and the discharge of air mixed in water during running water. , To ensure the safety of pipes and smooth water flow. Conventional air valves include, for example, those shown in FIG.

In FIG. 3, reference numeral 1 denotes an air valve arranged in a pipe 2 for industrial use, and the valve box 3 has a large-diameter air hole 4 formed at the upper end thereof and a communication hole 5 at the lower portion thereof. It communicates with the inside of the pipe 2. A guide cylinder 6 is disposed inside the valve box 3 concentrically with the large-diameter air hole 4. The guide cylinder 6 has a flow hole 7 in the upper part and a small air hole 8 is formed inside. The floating valve body 9 and the float 10 are arranged so as to be able to move up and down, and the floating valve body 9 opens and closes the large diameter air hole 4, and the float 10 opens and closes the small air hole 8.

In the above structure, when a large amount of air is exhausted, such as when the entire pipe is filled with water, the floating valve body 9 and the float 10 are both located in the lower part of the guide cylinder 6 as shown in the figure. The exhaust air from the pipe 2
It flows into the valve box 3 through the communication hole 5, then flows into the guide cylinder 6 through the flow hole 7, and is discharged to the outside of the valve box 3 through the large-diameter air hole 4.

When a large amount of air is taken in, such as when draining the entire pipeline, in a state in which both the floating valve body 9 and the float 10 are located in the lower portion of the guide cylinder 6 as described above, Intake air is taken into the pipe 2 from the outside of the valve box 3 along a path that sequentially passes through the large-diameter air hole 4, the flow hole 7, and the communication hole 5.

On the other hand, when the entire pipeline is filled with water and becomes nearly full, the water enters the valve box 3 of the air valve 1 from the pipe 2 and rises, and the float 10 changes due to fluctuations in the water level in the valve box 3. While moving up and down to move the floating valve body 9 up and down, the small air holes 8
Open and close.

That is, when the valve box 3 is substantially filled with water, the floating valve body 9 is located in the upper part to close the large-diameter air hole 4, and the float 10 is located in the upper part, and the small air hole is located. 8 is closed and completely shut off. Once the large air hole 4 is closed by the floating valve body 9 and internal pressure is applied, the floating valve body 9 cannot be lowered and the large air hole 4 is not opened.

In this state, when the air gradually accumulates in the valve box 3 to lower the water level, the float 10 descends to open the small air hole 8 and the air is discharged to the outside of the valve box 3 through the small air hole 8. To be done. After the air is released, the water level in the valve box 3 rises, so the float 10 rises and closes the small air holes 8 again.

[0009]

As described above, the air valve is used to discharge the air in the pipeline when refilling water, supply the air to the pipeline when draining water, and discharge the mixed air in water during running water. However, if such an air valve is installed on the siphon pipe, the negative pressure in the siphon pipe is transmitted to the air valve and intake is performed, so that a cavity occurs in the siphon pipe. , Water is not passed smoothly.

The present invention solves the above problems, and an object of the present invention is to provide an air valve that does not hinder the smooth flow of the fluid inside the pipe even if it is provided on the siphon pipe.

[0011]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention has a valve box having an air hole at an upper end and a lower part which opens and closes the air hole in a valve box communicating with a pipe. In an air valve in which a body is vertically movable, a lid body for opening and closing the air hole from above is provided at an upper end portion of the valve box.

According to the above-mentioned structure, the lid is opened when the water is exhausted and the air is supplied or the water is discharged.
It is possible to open and close the air holes by raising and lowering the valve body without blocking the air holes from above and perform intake and exhaust, and normally, by closing the lid body, closing the air holes from above, It is possible to set a state in which automatic intake / exhaust is not performed. Therefore, even if the air valve is provided on the pipe having a negative pressure inside, the intake is not automatically performed during water passage, and the smooth flow of the fluid in the pipe is not hindered.

[0013]

An embodiment of the present invention will be described below with reference to the drawings. 1 and 2, the air valve 11 of the present invention has substantially the same configuration as that of the conventional one described with reference to FIG. 3, and therefore members having the same action are denoted by the same reference numerals and described. Is omitted.

Here, the air valve 11 is different from the conventional one in that a lid 13 for opening and closing the large-diameter air hole 4 from above is provided at the upper end of the valve box 3. That is, at the upper end of the valve box 3, a cylindrical body 12 concentric with the large diameter air hole 4 is placed on the periphery of the large diameter air hole 4, and the cylindrical body 12 is provided at the upper end of the cylindrical body 12. A lid 13 was provided to cover the opening.

According to the above-mentioned structure, normally, by closing the lid 13 as shown in FIG. 1, the large air hole 4 is closed from above, and the automatic intake and exhaust is performed. You can prevent it from happening.

When the water is exhausted and the air is drained, the lid 13 is opened as shown in FIG. 2 to open the large-diameter air hole 4 from above. As a result, the large-diameter air hole 4 can be opened and closed by raising and lowering the float 10 to perform intake and exhaust.

Therefore, even if the air valve 11 is provided in a siphon pipe or the like having a negative pressure inside, the fluid can smoothly flow without breaking the siphon in the pipe line.

[0018]

As described above, according to the present invention, by providing the lid body for opening and closing the air hole formed in the upper end portion of the valve box from above, it is possible to perform intake and exhaust when draining water, etc. At other times, automatic intake / exhaust is prevented, so even if this air valve is installed on a siphon pipe with negative pressure inside, the smooth flow of the fluid inside the pipe is obstructed. There is no.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state of an air valve according to an embodiment of the present invention when passing water.

FIG. 2 is a cross-sectional view showing a state of the air valve during intake.

FIG. 3 is a cross-sectional view showing a configuration of a conventional air valve.

[Explanation of symbols]

 2 Piping 3 Valve box 4 Large diameter air hole 9 Floating valve body 11 Air valve 13 Lid body

Claims (1)

[Claims] 1. An air valve having an air hole at an upper end thereof, and a valve body which opens and closes the air hole in a lower portion communicating with a pipe in a lower portion and which is vertically movable. An air valve, wherein a lid for opening and closing the air hole from above is provided at an upper end portion.