JP2003253707A - Fire hydrant with air valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact, low-height fire hydrant. <P>SOLUTION: The fire hydrant with an air valve is attached to a rising pipe 56 through a ball valve type repair valve 25 from a water supply pipe line 55 laid in a pit buried underground. The side of the valve case 1A of an air valve is widened flat sideways. By this way, a flow passage 3 to a screw type hydrant 2 is formed. An inflow opening 4 is formed in the upper wall of the stream passage 3. The mounting position of the fire hydrant 2 is made lower than conventional cases by making the widened part of the body of the air valve flat and further, the fire hydrant is made low in the height and in a screw type to provide the low-height fire hydrant with an air valve which is usable for a water supply pipe line buried shallow underground. In the fire hydrant, prevention of spraying in slight opening can be realized by securing safety in water discharge and securing air tightness. Further, the pit buried underground can be made small by reducing size and making the hydrant low. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire hydrant with an air valve attached to a underground water pipe.

[0002]

2. Description of the Related Art A conventional integrated fire hydrant with an air valve is disclosed in Japanese Patent Laid-Open No. 11-166650, and an example thereof is shown in FIG. 5, which is shown in FIG. It is attached via a ball valve type repair valve 54 to a rising pipe 56 from a water pipe 55 arranged in a pit P buried in the ground.

As shown in FIG. 5, the fire hydrant with an air valve is provided with an opening 42 on the side surface of a valve box 41 of the air valve 40, and a cylindrical water discharge passage 4 protruding laterally from the opening 42.
3 is bent upward, and a water discharge port 46 is formed in the upward water discharge flow path 43 via a ball valve type on-off valve 44. After connecting the hose to the water discharge port 46 and opening the on-off valve 44,
Water can be discharged by flowing water into the hose from the water discharge port 46. Further, in the valve box 41 of the air valve 40, the guide cylinder 50 is arranged concentrically with the large-diameter air hole 52, and the guide cylinder 5 is provided.
Inside the 0, a floating moving body 48 having a small air hole 53 and a float 49 are vertically movable. In this air valve, when the valve box 41 is filled with air and the water level is lowered, the float 49 is lowered to open the small air holes 53 to release the air to the outside, and after the air is released, As the float 49 rises with the water level and the small air holes 53 are closed, the water in the water pipe 55 is constantly evacuated.

[0004]

By the way, today, the water pipe 55 has been buried in a shallow underground layer, and there is a demand for lowering the height T (depth of the pit P) of the fire hydrant with an air valve. . However, in the conventional fire hydrant with the air valve, the ball valve type on-off valve 44 is provided at the tip of the water discharge flow path 43 bent upward.
Since the water discharge port 46 is provided through the pipe, its height T becomes high, and it may not be used in the water pipe 55 buried in the shallow layer. Further, as shown in FIG. 6, since the swing width W of the lever 45 is large and hits the wall surface of the pit P, at a place where the lateral width of the pit P is not sufficiently wide, the lever 45 is detached and the opening / closing valve 44 is provided.
Opening and closing work and checking the open and close position of the fire hydrant are complicated.

Further, when the ball valve type on-off valve 44 is opened, there is a danger that a person having a water discharge nozzle will suddenly be exposed to a sudden pressure of water pressure when the valve is opened. There is a problem that water is blown out in a mist when draining the pipe.

An object of the present invention is to solve the above problems.

[0007]

In order to solve the above-mentioned problems, the present invention firstly expands the side portion of the air valve box laterally in a flat shape and attaches the fire hydrant to the upper wall of the expanded portion. It has an inflow port. In this way, by making the enlarged portion of the air valve valve box that is a flow path to the fire hydrant laterally flat, the mounting position of the fire hydrant can be made lower than before. Furthermore, a low-profile screw-type fire hydrant that can be opened by rotating the screw is integrated into the upper part of this inlet, which makes it possible to further reduce the overall height of the device. In addition, the screw type fire hydrant,
Since the lever is not used for opening and closing and only the valve is raised and lowered by the rotation of the screw, the required lateral width of the pit P is small, and it has the advantage that it can be opened and closed slowly, and it is airtight. It is high, and no mist-like water is blown out when opening slightly.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION One embodiment is shown in FIGS.
In this embodiment, the pit P buried in the ground is the same as the conventional one.
Rise pipe 56 from water pipe 55 piped inside
In addition, it is a fire hydrant with an air valve attached via a ball valve type repair valve 25. The repair valve 25 is bolted to the rising pipe 56, and the ball valve-shaped valve element 2 is provided in the repair valve box 26.
7, the valve shaft 28 projects laterally from the valve box 26 and is connected to a quadrangular prismatic operating rod 24 via a worm gear mechanism 29. When the T-shaped stopper rod is fitted into the operating rod 24 and rotated, the valve body 27 rotates via the operating rod 24, the worm gear mechanism 29 and the valve shaft 28, and the water flows into the air valve valve box 1A. Is opened and closed.

The air valve 1 has its valve box 1A attached to the upper portion of the repair valve 25 by bolting.
It is a low-profile type in which a guide container 20 and a floating valve body 19 each having a specific gravity of 1 or less are installed. Normally, the valve container 21 and the small air hole 21a are raised by the buoyancy and water pressure of the water from the water pipe 55 to close the valve opening 21 and the small air hole 21a. Deflate. In addition, when a large amount of air is taken in, such as when draining the pipeline, the floating valve body 19 descends to the position shown at 18 in the lower part of the guide container 20, and outside air is taken in from the outside through the valve port 21.

On the side of the valve box 1A of the air valve 1, there is a laterally flattened flow passage 3 to the fire hydrant, and on the upper wall of the flow passage 3 is an inlet 4 to the fire hydrant 2. Are formed. The valve box 2A of the fire hydrant 2 is formed integrally with the valve box 1A and the flow path 3 via the inflow port 4. As shown in FIG. 3, the valve box 2 </ b> A is provided with a water discharge passage 10 that protrudes to the outside of a side portion of the space 5 inside thereof, and the water discharge passage 10 is opened upward to form a water discharge port 11. In the space 5, a valve rod 6 screwed to the valve box 2A and a valve body 7 connected to the valve rod 6 are arranged, and a valve seat 8 is provided on the upper surface side of the inflow port 4. Both the valve body 7 and the valve seat 8 are covered with an elastic body to ensure water shutoff. An operating rod (cap) 15 is attached to the upper end portion of the valve rod 6, and a T-shaped stopper rod is fitted on the operating rod (cap) 15 to rotate the valve rod 7 to move up and down. The fire hydrant 2 is opened and closed by approaching and separating the fire hydrant 8. The outlet 11 is a fitting 1
A flange 13 in which 2 is screwed is screwed to the water discharge passage 10, and a push ring 14 is fitted on the insert 12 so as to be able to move up and down. A hose is connected to this plug 12 to discharge water.

In this embodiment, as described above, the side portion of the valve box 1A of the air valve 1 is laterally expanded in a flat shape, so that the fire hydrant 2 that is integrated with the air valve 1 can be mounted at a conventional position. The height can be made even lower than the above, and the height can be further reduced by being integrated with the screw type fire hydrant. When the fire hydrant 2 is opened and closed, it can be opened and closed from the outside of the buried pit P by attaching and rotating a T-shaped stopper rod to the operating rod (cap) 15, and the lever can be operated horizontally. The required lateral width of the pit P is smaller than that of a conventional fire hydrant with an air valve, which has a large swing width. Furthermore, since the screw type fire hydrant is opened and closed gently by rotating the valve rod 6 a plurality of times, dangerous elements such as sudden water discharge at the time of opening like the ball valve type fire hydrant are eliminated, and it occurs at the time of slight opening. No mist-like water is blown out.

In this embodiment, the valve box 2A of the fire hydrant 2 is used.
The valve box 1A of the air valve 1 and the valve box 1A of the air valve 1 are integrally molded. For example, as shown in FIG. 4, the valve box 2A of the fire hydrant 2 and the valve box 1A of the air valve 1 are separately manufactured to form a dividing line. It is also possible to join them with a bolt at a and integrate them. Further, when the valve rod 6 screwed to the valve box 2A and the operating rod (cap) 15 are joined, a spline mechanism is employed for this joining, so that the operating rod (cap) 15 is moved along with the rise of the valve rod 6. It is possible to use a mechanism in which the fire does not rise, which allows the height of the fire hydrant to be further reduced.

[0013]

As described above, according to the present invention, the side portion of the air valve valve box is laterally enlarged in a flat shape, and the inlet of the fire hydrant is provided at the upper wall of the enlarged portion to attach the fire hydrant. Can be made lower than before, and by integrating it with a low-profile screw-type fire hydrant that can be opened by rotating the screw, the height can be kept lower than that of the conventional fire hydrant with an air valve. For this reason,
Since it does not use a lever to open and close, the required width of the pit can be made smaller than before, and it has the advantage that the fire hydrant can be opened and closed slowly with a screw. No mist-like water bubbles are generated.

[Brief description of drawings]

FIG. 1 is a cutaway front view of an embodiment.

FIG. 2 is a plan view of the same embodiment.

FIG. 3 is a partially cut right side view of the embodiment.

FIG. 4 is a cutaway front view of another embodiment.

FIG. 5 is a cutaway front view of a main part of a conventional example.

FIG. 6 is a right sectional view of a main part of a conventional example.

[Explanation of symbols]

1 air valve 1A Air valve valve box 2 fire hydrant 2A fire hydrant valve box 3 channels 4 Inlet 6 valve rod 7 valve body 8 seat 11 Outlet 15 Operation rod 19 Floating valve body of air valve 20 guide containers 21 valve 21a Small air hole 22 Lid 23 Guide container opening 55 water pipe 56 Rising tube a dividing line

Claims (2)

[Claims] 1. In a fire hydrant 2 with an air valve 1 attached to a underground water pipe 55, a valve box 1A of the air valve 1 is provided.
The side portion is laterally expanded in a flat shape to form a flow path 3 to the fire hydrant 2, the valve box 2A of the fire hydrant 2 is provided on the upper wall of the flat portion, and the inlet 4 to the valve box 2A is provided. A valve seat 8 is formed on the upper surface of the inflow port 4, and a valve rod 6 integral with the valve body 7 is screwed to the valve box and the valve rod 6 is rotated to form a valve on the valve seat 8. A fire hydrant with an air valve, characterized in that the body 7 is brought into contact with and separated from the body to open and close the fire hydrant 2. 2. A fire hydrant structure with an air valve, wherein the fire hydrant with an air valve according to claim 1 is attached to a rising pipe 56 from a water pipe 55 through a ball valve type repair valve 25.