JPH11181847A - Underground hydrant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the total height by forming the subvalve body opening/closing the inflow opening and the main valve body opening/closing the outflow opening to have a spherical shape in compliance with the inside face of the valve case and holding the subvalve body to be rotatabe to the opening and closing positions by the lower valve shaft provided in the central part of the valve case and also holding the main valve body to be rotatable to the opening and closing positions by the upper valve shaft. SOLUTION: An inflow opening 2 is formed at the lower part of a spherical valve case 1 and an outflow opening 3 is formed at the upper part thereof respectively. And a subvalve body 4 opening/closing true inflow opening 2 and a main valve body 5 opening/closing the outflow opening 3 are contained in the valve case 1 respectively. The subvalve body 4 and main valve body 5 are formed of a semispherical valve body in compliance with the the shape of the inside face of the valve case 1. The openings 4a, 5a corresponding to the inflow opening 2 or the outflow opening 3 are provided at a half part of the valve body respectively. The lower valve shaft 11 is provided at the upper part of the lower valve case 6 to horizontally arrange the axial line, and the subvalve body 4 is made rotatable to both opened and closed positions. The upper valve shaft 12 is provided under the upper valve case 7 to be parallel to the lower valve shaft 11 and the main valve body 5 is made turnable to both opening and closing positions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground fire hydrant attached to a water pipe, and more particularly to an underground fire hydrant in which a main valve and a sub valve are housed in one valve box.

[0002]

2. Description of the Related Art An underground fire hydrant attached to a water pipe buried underground is mounted on a branch pipe rising from the water pipe via a sub-valve. The auxiliary valve is closed when the fire hydrant main body is maintained, and is normally open.

On the other hand, the conventional buried pipeline has an earth covering of one.
Since it is set to 200 mm, even underground fire hydrants have been manufactured in a shape and size corresponding to 1200 mm of earth covering. However, recently, in order to reduce the construction cost, it is planned to reduce the earth covering of the buried pipeline to about 600 to 800 mm.

However, the conventional underground fire hydrant has a sub-valve between the fire hydrant main body and the buried pipe as described above.
In addition, since it is attached to the branch pipe rising from the pipeline, it is considerably protruded from the pipeline, and some measure is required when the earth covering of the buried pipeline is made thin.

Accordingly, an object of the present invention is to provide an underground fire hydrant capable of reducing the height of a fire hydrant including a sub-valve.

[0006]

To achieve the above object, an underground fire hydrant of the present invention opens and closes the inlet in a spherical valve box having an inlet at the bottom and an outlet at the top. An underground fire hydrant containing a sub-valve element and a main valve element that opens and closes the outlet, respectively, wherein both the valve elements are formed into spherical shapes corresponding to the inner surface shape of the valve box, and the sub-valve element is formed. The main valve body is rotatably held between a valve opening position and a valve closing position by a horizontal lower valve shaft provided in a central portion of the valve box, and the main valve body is provided by an upper valve shaft provided above the lower valve shaft. It is characterized by being held rotatably between a valve opening position and a valve closing position.

Further, in the underground fire hydrant of the present invention, the valve box has a hemispherical lower valve box containing a sub-valve including a lower valve shaft, and a hemispherical valve containing a main valve body including an upper valve shaft. The upper valve box is detachably connected to the upper valve box.

[0008]

1 to 3 show an embodiment of an underground fire hydrant according to the present invention. FIG. 1 is a sectional view showing a normal state in which a sub-valve is open and a main valve is closed. FIG. 2 is a sectional view showing a state where both valves are open, and FIG. 3 is a sectional view showing a state where both valves are closed.

The underground fire hydrant shown in this embodiment has an inlet 2 connected to a water pipe at the lower part of a spherical valve box 1 and an outlet 3 connected to a fire hose at the upper part. And a sub-valve element 4 for opening and closing the inflow port 2 and a main valve element 5 for opening and closing the outflow port 3 are accommodated in the valve box 1. The valve box 1 is assembled by detachably flange-connecting a hemispherical lower valve box 6 and an upper valve box 7 with an assembling bolt 8, and is embedded in the outer periphery of the bottom of the lower valve box 6. A mounting flange 9 connected to a branch pipe of the pipeline is provided, and a hose connection fitting 10 is provided on the top of the upper valve box 7.

A lower valve shaft 11 for rotating the sub-valve 4 between an open position and a closed position is provided above the lower valve box 6.
Are provided with their axes oriented in the horizontal direction.
An upper valve shaft 12 for rotating the main valve element 5 between a valve opening position and a valve closing position is provided in a lower part of the lower valve shaft 11 in a direction parallel to the lower valve shaft 11. The sub-valve 4 and the main valve 5 have the same structure as a so-called ball valve, and are formed in a shape using a part of the valve element peripheral surface of the ball valve. That is, the sub-valve element 4 and the main valve element 5 are formed of a hemispherical (bowl-shaped) valve element formed in a spherical shape corresponding to the inner surface shape of the valve box 1. Openings 4 a and 5 a corresponding to the inflow port 2 and the outflow port 3 are provided, respectively. As shown in FIGS. 2 and 3, the main valve element 5 is formed to have a smaller diameter than the auxiliary valve element 4 so as to be rotatable inside the auxiliary valve element 4. When the valve is opened and closed, the two valve bodies 4, 5
Are formed so as not to interfere with each other.

Note that the lower valve shaft 11 and the upper valve shaft 12
The valve body may be provided so as to penetrate the valve box 1 and each of the valve bodies 4 and 5. Is preferably rotatably supported, and one of the valve shafts is projected from the valve box 1. A valve opening / closing means composed of an operation lever and a valve opening / closing means connected via a worm are provided at the tip end portion of the valve shaft protruding from the valve box 1 in the same manner as in the related art.

In the normal state shown in FIG. 1, the sub-valve element 4 is in the valve-open state with the peripheral edge of the opening 4a abutting against a seal ring 13 provided on the inner periphery of the inflow port 2. The spherical portion of the valve body 5 abuts on a seal ring 14 provided on the inner periphery of the outlet 3 and is in a closed state.

When performing a fire extinguishing activity, the hose fitting 1
After connecting the fire extinguisher hose to 0, the upper valve shaft 12 is rotated by operating appropriate valve opening / closing means, and as shown in FIG. 2, the main valve body 5 is rotated to the valve opening position. Thereby, the main valve body 5
The valve 5 is in an open state in which the periphery of the opening 5a is in contact with the seal ring 14, and the water flowing in from the inflow port 2 is supplied to the fire extinguishing hose from the outflow port 3 through the valve box 1.

When cleaning the inside of the valve box 1 or checking the main valve body 5, the appropriate valve opening / closing means is operated to operate the lower valve shaft 1.
1 to rotate the sub-valve 4 to the closed position as shown in FIG. As a result, the sub-valve element 4 is in a valve-closed state in which the spherical portion is in contact with the seal ring 13, so that water does not flow from the inflow port 2 and the upper valve is removed by extracting the assembly bolt 8. The box 7 can be removed from the lower valve box 6.

As described above, by storing the sub-valve 4 and the main valve 5 in the spherical valve box 1, the height from the bottom mounting flange 9 to the top hose connection fitting 10 is reduced. Can be lowered, and the burial of the buried pipeline is 600-8
Even if it becomes about 00 mm, it can sufficiently cope.

Further, since the valve box 1 has a two-part structure of the lower valve box 6 and the upper valve box 7, inspection and replacement of the main valve body 5 can be easily performed only by attaching and detaching the assembly bolts 8. Furthermore, since a short pipe of an appropriate length can be inserted between the lower valve box 6 and the upper valve box 7 and flange-coupled to each other, even when the pipe is buried deep, the hose connection fitting can be used. 10 can be adjusted to a predetermined position from the road surface. Moreover, since the insertion and withdrawal of the short pipe can be performed even after the fire hydrant is installed in the buried pipeline, it is possible to easily cope with a change in the buried depth due to road construction or the like.

In addition, since the two valve elements 4 and 5 have the same structure as the ball valve, the loss is small and a large amount of fire-extinguishing water can be supplied. Is hardly deposited.

[0018]

As described above, according to the present invention,
Since the height of the underground fire hydrant, especially the height of the fire hydrant protruding from the upper surface of the pipeline, can be reduced, the burial of the buried pipeline is reduced by 60%.
Even if it becomes about 0 to 800 mm, it can be used without any problem.

[Brief description of the drawings]

FIG. 1 is a sectional view of an underground fire hydrant showing a normal state.

FIG. 2 is a sectional view showing a state where both valves are opened.

FIG. 3 is a sectional view showing a state where both valves are closed.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Valve box, 2 ... Inlet, 3 ... Outlet, 4 ... Sub-valve, 4a
... opening, 5 ... main valve body, 5a ... opening, 6 ... lower valve box, 7 ...
Upper valve box, 8: Assembly bolt, 9: Mounting flange, 10 ...
Hose connection fitting, 11: Lower valve shaft, 12: Upper valve shaft, 1
3,14… Seal ring

Claims (2)

[Claims] An underground in which a sub-valve for opening and closing the inlet and a main valve for opening and closing the outlet are housed in a spherical valve box having an inlet at a lower part and an outlet at an upper part, respectively. A fire hydrant, wherein the two valve bodies are formed into spherical shapes corresponding to the inner surface shape of the valve box, and the sub-valve element is opened and closed by a horizontal lower valve shaft provided in the center of the valve box. The main valve body is rotatably held at a valve closing position, and the main valve body is rotatably held at a valve opening position and a valve closing position by an upper valve shaft provided above the lower valve shaft. Underground fire hydrant. 2. The valve box has a hemispherical lower valve box containing a sub-valve body including a lower valve shaft and a hemispherical upper valve box containing a main valve body including an upper valve shaft. The underground fire hydrant according to claim 1, wherein the fire hydrant is formed by being connected to the fire hydrant.