JPH0547799Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an above-ground fire hydrant with an air valve, in which an air valve is integrally assembled to the above-ground fire hydrant.

[Conventional technology]

In urban water pipes, water mains are used to automatically discharge air mixed in the water, especially air that accumulates in high places in the water mains, and to draw in outside air when removing water from the water mains. An air valve is installed in the pipe. Additionally, a fire hydrant is attached to a water main to connect a fire pump hose in the event of a fire, and a fire hydrant with an air valve is also used, in which an air valve is attached to the fire hydrant.

As this fire hydrant with an air valve, an underground fire hydrant with an air valve attached is disclosed in Japanese Utility Model Publication No. 12399/1983.

As shown in FIG. 2, this fire hydrant with an air valve is installed in a manhole 1 covered with an iron cover 2 fitted to a frame 1a, and is constructed as follows.

That is, the fire hydrant valve box 3 has a lower inlet 4 connected to a water main pipe 6 via a connecting pipe 5, and a side outlet 7 connected to a water discharge pipe 8, respectively. A water outlet cap 9 that covers the upper water outlet of the water discharge pipe 8 is provided with a ventilation hole 10 that communicates the inside of the water discharge pipe 8 and the inside of the manhole 1.
is formed. A valve seat 11 is formed in the fire hydrant valve box 3, and the valve body 12 seated on the valve seat 11 is moved upward by rotation of the valve stem 13 to open the valve.

An L-shaped branch pipe 14 is installed on the side of the fire hydrant valve box 3.
The air valve box 15 is supported by. The L
The shaped branch pipe 14 communicates the inlet 4 and the air valve box 15. A float valve body 17 is disposed within the case 16 disposed within the air valve box 15.
is accommodated. Furthermore, a valve seat cover 18 having a small diameter air hole valve seat 18a on which a float valve body 17 is seated is provided on the upper part of the air valve box 15.
A lid 19 is provided on the top of each.

A communication pipe 20 is provided between the upper part of the water discharge pipe 8 and the lid 19, and communicates the inside of the upper part of the water discharge pipe 8 with the inside of the air valve box 15 via the small diameter air hole valve seat 18a. There is.

Therefore, the air in the water main 6 flows through the inlet 4, the branch pipe 14, the air valve box 15, the communication pipe 20,
Vent hole 1 of water outlet cap 9 via water outlet pipe 8
0 into manhole 1.

[The problem that the idea attempts to solve]

However, in the underground fire hydrant with air valve configured as described above, since the manhole 1 is covered by the iron cover 2, the frame 1a of the manhole 1 and the iron cover 2
Sediment, etc. gets stuck in the gap between the two and becomes airtight. A similar situation also occurs during winter when it snows or freezes.

Therefore, if air is discharged through the air valve under such conditions, the pressure inside the manhole 1 will rise and the iron cover 2 will eventually blow up, which is extremely dangerous. .

Additionally, the iron lid is larger and heavier than when installing a single fire hydrant or air valve, making it inconvenient for fire extinguishing work and maintenance and inspection work.

Therefore, it is desired to install a fire hydrant with an air valve on the ground, but if a fire hydrant with the above configuration is simply installed on the ground, the air valve box 15 is placed on the side of the hydrant valve box 3. Overhanging and branch pipe 14
An above-ground fire hydrant with an air valve does not currently exist because the installation space is too large due to the provision of a hydrant and a communication pipe 20.

Therefore, in view of the above points, the present invention aims to provide an above-ground fire hydrant with an air valve that does not take up a large installation space.

[Means to solve the problem]

The present invention consists of a fire hydrant valve box that has an inlet connected to a water main and an outlet connected to a water discharge pipe that stands above the ground, a valve body that sits on a valve seat in the fire hydrant valve box, and a valve body that In an above-ground fire hydrant that can be operated by a valve stem from the top of a water discharge pipe, an air valve box is integrally formed adjacent to the fire hydrant valve box, and the air valve box is configured to:
A valve seat cover that accommodates a float valve body inside and has a small diameter air hole valve seat on the upper part on which the float valve body is seated, and a cover that extends to the upper periphery of the fire hydrant valve box above the valve seat cover. A communication hole is formed in the lower part of the peripheral wall of the fire hydrant valve box and the air valve box to communicate the inside of the lower part of the air valve box with the inlet, and the outlet is provided between the valve seat cover and the cover. The water discharge pipe is characterized by forming a communication path communicating with the water discharge pipe, and forming a vent hole communicating the inside of the water discharge pipe with the outside in a water discharge port cap that is covered with the water discharge port of the water discharge pipe.

[Effect]

Therefore, the air in the water main enters the outlet from the communication passage via the inlet, the communication hole, the air valve box, and the small-diameter air hole valve seat, and then rises inside the water discharge pipe and flows through the water outlet cap. It is released to the outside through the stomata.

Since the air valve is integrally formed on the side of the fire hydrant valve box, the installation space does not become large, and there is no problem even if the fire hydrant and the air valve box are buried underground.

〔Example〕

An embodiment of the above-ground fire hydrant with air valve according to the present invention will be described below with reference to FIG.

The fire hydrant valve box 31 has an inlet port 32 that opens at the bottom.
is connected to a water main pipe 34 via a connecting pipe 33, and an outlet 35 opening at the top is connected via a straight pipe 36 to the upper part of a water discharge pipe 37 standing above the ground. A valve seat 38 is formed in the fire hydrant valve box 31, and a valve body 39 is seated on the valve seat 38.
The valve is opened by rotating the valve stem 40 from above the water discharge pipe 37 to move it upward. A clutch 41 is provided in the middle of the valve stem 40. A water outlet 42 is provided at the upper side of the water outlet pipe 37, and a water outlet cap 4 is provided to cover the water outlet 42.
3 is formed with a vent hole 44 that communicates the inside of the water discharge pipe 37 with the outside.

An air valve box 4 is provided on the side of the fire hydrant valve box 31.
5 are integrally formed adjacent to each other. The air valve box 45 houses a float valve body 46 therein, and has a valve seat cover 47 having a small-diameter air hole valve seat 47a on which the float valve body 46 is seated. Each is provided with a lid 48 on the top. The lid 48 extends to the upper part of the fire hydrant valve box 31 and is held between the fire hydrant valve box 31 and the straight pipe 36.

A communication hole 49 communicating with the bottom of the air valve box 45 and the inlet port 32 is formed in the lower part of the peripheral wall 31a of the fire hydrant valve box 31 and the peripheral wall 45a of the air valve box 45. Further, a communication passage 50 communicating with the outlet port 35 is formed between the valve seat cover 47 and the cover 48 .

By configuring as above, the water main 34
The air inside flows through the communication path 5 through the inlet 32, the communication hole 49, the air valve box 45, and the small-diameter air hole valve seat 47a.
The water enters the outlet 35 from 0, rises inside the water discharge pipe 37, and is discharged to the outside through the vent hole 44 of the water discharge cap 43.

In addition, the air valve box 45 does not protrude from the fire hydrant valve box 31 that much, and the communication hole 49 and the communication path 5
0 is not installed externally, the entire fire hydrant becomes compact, and the installation space does not become large.Furthermore, as shown in the figure, it is easy to bury the fire hydrant valve box 31 and the air valve box 45 underground. If it is semi-underground like this, there will be fewer parts that protrude above the ground.

[Effect of idea]

As described above, since the fire hydrant valve box and the air valve box are integrally formed, and the communication hole and the communication path are provided inside both valve boxes, the installation space does not become large and the above-ground type can be used. Additionally, the status of air intake and exhaust can be checked through the vents in the water outlet cap. Furthermore, when connected to a pump truck and discharging water, air will not be sucked in from the air valve even if the pipe line becomes negative pressure.

Moreover, even if the fire hydrant valve box and the air valve box are buried underground, the air in the water main can be released to the atmosphere, eliminating the need for a dedicated manhole or iron cover. Furthermore, if both valve boxes are buried underground, the risk of freezing due to geothermal heat is reduced.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional front view of an above-ground fire hydrant with an air valve, which is an embodiment of the present invention, and FIG. 2 is a sectional front view of an example of a conventional underground fire hydrant with an air valve. 31... Fire hydrant valve box, 32... Inlet port, 34...
...Water main, 35...Outlet, 37...Water pipe,
42...Water outlet, 43...Water outlet cap, 44
...Vent hole, 45...Air valve box, 46...Float valve body, 47...Valve seat cover, 47a...Small diameter air hole valve seat, 48...Lid, 49...Communication hole, 50...
Communication path.

Claims (1)

[Scope of utility model registration request] A fire hydrant valve box with an inlet connected to a water main and an outlet connected to a water discharge pipe standing above the ground, a valve body seated on a valve seat in the fire hydrant valve box, and a valve body connected from the top of the water discharge pipe. In an above-ground fire hydrant that can be operated by a valve stem, an air valve box is integrally formed adjacent to the fire hydrant valve box, and the air valve box accommodates a float valve body inside and has an air valve box in its upper part. A valve seat cover having a small-diameter air hole valve seat on which a float valve element is seated, and a lid extending to the upper periphery of the fire hydrant valve box on the upper part of the valve seat cover; forming a communication hole communicating between the lower part of the air valve box and the inlet, and forming a communication passage communicating with the outlet between the valve seat cover and the cover;
An above-ground fire hydrant with an air valve, characterized in that a vent cap that covers the water discharge port of the water discharge pipe is formed with a vent hole that communicates the inside of the water discharge pipe with the outside.