JPH089496Y2 - Air valve - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an air valve equipped for venting air from a water pipe such as a water pipe.

[Prior Art] An air valve shown in FIG. 4, for example, is known as an air valve that is attached in communication with a water pipe to remove air from the water pipe such as a water pipe. In the figure, an air valve is installed in communication with a water pipe 1 and a valve box 2, and is housed inside the valve box 2 according to the water level of water flowing from the water pipe 1 side into the valve box 2. A float 3 that moves up and down, and a guide member 4 that is capped by the float 3 and has a U-shaped cross section together with the float 3.
It is equipped with a floating valve body 5 that moves up and down with the guide as a guide, and an upward seat portion 5A is formed on the outer peripheral portion of the floating valve body 5.

A lid 7 having a valve hole 6 formed therein is attached to the upper portion of the valve box 2, and a valve seat 8 attached downward to the outer peripheral portion of the valve hole 6 faces the seat portion 5A of the floating valve body 5. .

Therefore, in the initial state in which the piping of the water pipe 1 is completed, the float 3 and the floating valve body 5 are held at the illustrated position, that is, the valve open position. Therefore, when the water pipe 1 is filled with water, the air in the water pipe 1 passes from the valve box 2 through the cutout portion 4A of the guide member 4 and the valve hole 6 and the lid body 7, as shown by the arrow.
The air is rapidly exhausted to the outside through a ventilation space 10 formed between the lid 7 and a cover 9 attached to the upper portion.

The buoyancy is generated in the float 3 as the water enters the valve box 2 due to the water filling of the water passage pipe 1, so that the float 3 and the floating valve body 5 float up with the guide member 4 as a guide and move freely. The seat portion 4A of the valve body 5 is in close contact with the valve seat 8 and the valve hole 6
The valve is closed as shown in FIG. 5 to stop the water.

[Problems to be Solved by the Invention] However, in the conventional air valve, although the float 3 and the floating valve body 5 are sucked up by the rapid exhaust flow generated during the above-described filling operation, the exhaust is not completed. First, the seat portion 4A of the floating valve body 5 comes into close contact with the valve seat 8 and the valve hole 6
There is a risk of inconvenience that the closed valve will be closed.

In order to avoid such inconvenience, conventionally,
Before the filling operation, the cover 9 of the air valve is removed, a manual tool such as a spanner is inserted into the valve box 2, and the floating valve element 5 is pressed downward until the exhaust is completed.

However, the work of attaching and detaching the cover 9 is relatively complicated, and there is a risk that the worker will be exposed to the water ejected when the exhaust is completed.

The present invention has been made in view of such circumstances, and it is possible to prevent the floating valve body from floating without disassembling the air valve, that is, without removing the cover, and achieve improvement in workability and safety. The purpose is to provide an air valve that can.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a float that moves up and down according to the water level of water flowing from the water pipe side into a valve box that is installed in communication with the water pipe. The floating valve body, which is placed and crowned on the float and moves up and down together with the float, opens and closes the valve hole of the lid body mounted on the upper part of the valve box, and also has a ventilation space on the upper part of the lid body. In the air valve equipped with, the exhaust operation shaft that comes into contact with the floating valve element and prevents the float and floating valve element from floating due to the rise in water level is attached to the cover so as to be able to move forward and backward with respect to the valve box. is there.

[Operation] According to the present invention, the exhaust valve is caused by the buoyant force of the float generated by the rise of the water level in the valve box when the exhaust valve is brought into contact with the floating valve element by advancing it into the valve box. You can prevent the body from rising.

When the exhaust operation shaft is retracted from the valve box when the exhaust is completed, the floating valve element floats due to the buoyancy of the float, and the valve hole is closed to stop the water.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a vertical sectional front view of an air valve to which the present invention is applied. A feature of the present invention relates to a structure in which an exhaust operation shaft that comes into contact with the floating valve body and prevents the float and the floating valve body from floating due to a rise in water level is attached to a cover member so as to be able to move forward and backward with respect to the valve box. Except for these, other members and the structure thereof are not different from those of the conventional example. Therefore, in FIG. 1, parts corresponding to FIG. 4 and FIG. Omit it.

In FIG. 1, reference numeral 11 denotes an exhaust operation shaft, and its male screw portion 11
A is screwed into a screw hole 9A formed by penetrating the central portion of the cover 9, and is attached to the valve box 2 so as to be able to move forward and backward (movable up and down). Corresponding to the upper end, the head with a rectangular cross section through the pin 12 on the upper end
A cap 13 having 13A is attached.

With such a configuration, a manual tool 14 such as a box spanner is fitted to the head 13A of the cap 13 in advance, as shown in FIG. 2, before the water pipe 1 is filled with water. By rotating in the forward direction, the exhaust operation shaft 11 is screwed to enter the valve box 2, and the pressing portion 11B is brought into contact with the floating valve body 5. As a result, even if buoyancy is generated in the float 3 due to the rise in the water level in the valve box 2 accompanying the filling of the water pipe 1, it is possible to prevent the float 3 and the floating valve body 5 from floating.

Therefore, as the air in the water pipe 1 is indicated by the arrow,
Even if rapid exhaust is performed from the valve box 2 to the outside through the cutout portion 4A of the guide member 4 and the valve hole 6 through the ventilation space 10, the rapid exhaust flow causes the float 3 and the floating valve body 5 to be sucked up and exhausted. Although not completed, it is possible to surely avoid the inconvenience that the seat portion 4A of the floating valve body 5 comes into close contact with the valve seat 8 and the valve hole 6 is closed to bring the valve closed state.

When the above-mentioned exhaust is completed, the exhaust operation shaft 11 is retracted and retracted from the valve box 2 by the reverse rotation of the manual tool 14, so that the float 3 and the floating valve body 5 guide the guide member 4 by the buoyancy of the float 3. And the seat portion 4A of the floating valve body 5 is in close contact with the valve seat 8 to close the valve hole 6 and the valve is closed to stop the water.

Thus, according to the present invention, the relatively complicated cover 9 is used.
The floating operation of the floating valve body 5 can be reliably prevented by omitting the attachment / detachment work and simply rotating the exhaust operation shaft 11, so that workability is improved and water is ejected when exhaust is completed. Even if it is shielded by the cover 9, the worker is not exposed to water and the safety is improved.

[Advantages of the Invention] Since the present invention is configured as described above, it has the advantages described below.

That is, even if buoyancy is generated in the float due to the rise of the water level in the valve box during refilling, the floating valve can be operated by simply rotating the exhaust operation shaft while omitting the relatively complicated cover installation and removal work. Even if the floating of the body is prevented and the exhaust is not completed, it is possible to reliably avoid the inconvenience of the floating valve body closing the valve hole, so that the workability is improved. Also, even if water is ejected when the exhaust is completed, it can be shielded by the cover, so that the worker is not exposed to the water and the safety is improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of an air valve to which the present invention is applied, FIG. 2 is a vertical sectional front view showing a rapid exhaust state, FIG. 3 is a vertical sectional front view in normal use, and FIG. 4 is a conventional air valve. FIG. 5 is a vertical sectional front view, and FIG. 5 is a vertical sectional front view at the time of normal use. 1 ... Water pipe 2 ... Valve box 3 ... Float 5 ... Floating valve body 6 ... Valve hole 7 ... Lid body 9 ... Cover 10 ... Ventilation space 11 ... Exhaust operation shaft

Claims (1)

[Scope of utility model registration request] Claims: 1. A float valve which is arranged in communication with a water pipe and which moves up and down according to the water level of the water flowing in from the water pipe side. The float valve is capped by the float and moves up and down together with the float. In the air valve in which the body opens and closes the valve hole of the lid attached to the upper part of the valve box, and the cover is attached to the upper part of the lid with a ventilation space,
An air valve, wherein an exhaust operation shaft, which comes into contact with an idle valve body and prevents the float and floating valve body from floating due to a rise in water level, is attached to a cover so as to be movable back and forth with respect to the valve box.