JPH11324036A - Hydrant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent water from abruptly jetting out in inspection to safely carry out an inspecting work by providing a resistant body in the midway of a passage way from a valve element to the discharging opening, in a hydrant using a ball valve type valve. SOLUTION: A subvalve element 5 opening or closing the inflow opening 2 and a chief valve element 6 opening or closing the outflow opening 3 are housed in a valve box 1 spherically formed. These both valve elements 5, 6 have the same structure with a so-called ball valve and a semispherical valve element has a spherical face corresponding to the shape of the inside face of the valve box 1. In a hydrant using such a ball valve type valve, a resistant body 15 made of a disk-shaped elastic body having such a size that the passage way is blocked is provided in the midway of the passage way extending from the chief valve element 6 to the discharging opening at the front end of the insertion metal tool 3. Radial slits extending from the central part to the outer peripheral part are provided in the resistant body 15. In this way, when the valve elements are rotated in the inspection of the hydrant, water is prevented from abruptly jetting out and inspection works can be safely carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire hydrant, and more particularly, to a fire hydrant having a structure for preventing water from spouting from a fitting part during inspection.

[0002]

2. Description of the Related Art As a valve of a fire hydrant attached to a water pipe, a ball valve type valve is often used in consideration of operability and reliability. As is well known, a ball valve accommodates a valve body having a spherical outer peripheral surface in a valve box having a spherical inner peripheral surface in a rotatable manner, and the valve body is provided with an opening provided in the valve body. The valve is normally opened and closed by turning 90 degrees between a valve opening position where the part matches the opening of the valve box and a valve closing position where the opening of the valve box is closed by the body of the valve body. It is formed as follows.

On the other hand, in the case of a fire hydrant, the opening and closing operation of the valve is regularly inspected in preparation for use. In this inspection work, without connecting the fire hose to the fitting of the fire hydrant, the valve was opened slightly, so that the inside of the valve was looked through from the water outlet side, and the operation state of the valve and the outflow state of the water were checked. .

[0004]

However, in the above-mentioned inspection work, when the valve is slightly opened, water may suddenly blow out from the small gap toward the water discharge port. The face of a worker performing inspection work was sometimes hit directly.

Accordingly, an object of the present invention is to provide a fire hydrant capable of preventing a sudden spout of water from a water outlet during inspection.

[0006]

In order to achieve the above object, the fire hydrant of the present invention is a fire hydrant using a ball valve, the size of which closes the flow path from the ball valve to the water outlet. And a resistor having a plurality of radially extending slits extending from the center to the outer periphery of the resistor.

[0007]

1 and 2 show an embodiment of a fire hydrant according to the present invention. FIG. 1 is a longitudinal sectional view of a fire hydrant, and FIG. 2 is a plan view of a resistor.

The fire hydrant has an inflow port 2 connected to a water pipe at a lower portion of a spherical valve box 1 and an outflow port 4 provided with a fitting 3 to which a fire hose or the like is connected at an upper portion.
And a main valve element 6 for opening and closing the inflow port 4 in the valve box 1 and a main valve element 6 for opening and closing the outflow port 4.
And are stored respectively. The valve box 1 is assembled by detachably flange-connecting a hemispherical lower valve box 7 and an upper valve box 8 with assembly bolts 9.
A mounting flange 10 connected to the branch pipe of the buried pipeline is provided on the outer periphery of the bottom of the lower valve box 7.

A lower valve shaft 11 for rotating the sub-valve element 5 between an open position and a closed position is provided above the lower valve box 7.
Are provided with their axes directed horizontally, and the upper valve box 8
An upper valve shaft 12 for rotating the main valve element 6 between the valve opening position and the 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 element 5 and the main valve element 6 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 5 and the main valve element 6 are hemispherical (bowl-shaped) formed in a spherical shape corresponding to the inner surface shape of the valve box 1.
Of the valve body, and an inlet 2 is provided in one half of the valve body.
And valve element openings 5a and 6a corresponding to the metal fittings 3 are provided. The main valve body 6 is formed to have a smaller diameter than the sub-valve element 5 so as to be rotatable inside the sub-valve element 5. , 6 are formed so as not to interfere with each other.

The lower valve shaft 11 and the upper valve shaft 12 may be provided so as to penetrate the valve box 1 and each of the valve bodies 5 and 6, but the valve box is so arranged that the valve shaft does not cross the flow path. It is preferable that short valve shafts are provided at opposing positions on the side surfaces so as to rotatably support each valve element, 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 5 is placed in a state where the peripheral edge of the valve element opening 5a is in contact with the lower valve seat 13 provided on the inner periphery of the inflow port 2. The opening 5a is in a valve-opening position where the opening 5a is open to the inlet 2. One of the main valve bodies 6 is in a valve-closing position in which the body of the valve body closes the outlet 4 in a state where the spherical body is in contact with the main valve seat 14 provided on the inner periphery of the outlet 4. It has become.

When performing a fire extinguishing activity, after connecting a fire extinguishing hose to the fitting 3, an appropriate valve opening / closing means is operated to rotate the upper valve shaft 12, and the main valve body 6 is moved to its valve body. Opening 6
a is rotated to the valve opening position where the outlet port 4 is opened. As a result, the main valve body 6 is in a valve-open state in which the peripheral edge of the valve body opening 6a is in contact with the main valve seat 14, and water flowing in from the inflow port 2 flows out through the valve box 1 to the outflow port 4. Then, it is supplied from the fitting 3 to the fire extinguishing hose.

In the middle of the flow path from the main valve body 6 to the water outlet at the tip of the fitting 3, a resistor 15 made of a disc-shaped elastic body large enough to close the flow path is provided. ing. As shown in FIG. 2, the resistor 15 has a plurality of radial slits 16 extending from the center to the outer periphery. It is fixed in a state of being sandwiched between the innermost step of the screw and the tip of the male screw of the fitting 3. Also,
The material of the resistor 15 can maintain a disc-like shape to some extent when the valve is closed, and at the time of the fire extinguishing activity, the divided pieces divided by the slit 16 are positioned along the inner peripheral surface of the fitting 3 due to the flow of water. It is preferably a rubber-based material having an appropriate thickness and elasticity so that it can be deformed, and it may be formed of a transparent material. Furthermore, the number of slits 16 is arbitrary, but if the number is small, deformation at the time of water discharge becomes insufficient, and if it is too large, it becomes difficult to maintain the shape at the time of shielding.
Usually, about 6 to 12 are preferable.

By providing such a resistor 15, when the main valve 6 is rotated in the opening direction during inspection of the fire hydrant, the valve opening 6a is slightly opened to the outlet 4. Even when the water spouts vigorously, the spouted water can be blocked by the resistor 15, so that the water can be prevented from directly hitting the worker. The fact that the main valve body 6 has opened can be known by the sound of the jetted water hitting the resistor 15. If the amount of water increases, the water rises up to the fitting 3 through the resistor 15. Therefore, the operation of the main valve body 6 can be confirmed without any problem.

When the main valve body 6 is opened during the fire extinguishing activity, the resistor 15 is divided by the slit 16 and elastically deforms.
Since the state follows the flow path wall, the flow of fire-extinguishing water is not obstructed.

[0016]

As described above, according to the fire hydrant of the present invention, when the valve body is rotated at the time of inspection, it is possible to prevent water from spouting vigorously toward the worker. Inspection work can be performed safely. In addition, since the radial slits are provided to facilitate elastic deformation, the resistor does not obstruct the flow of the fire extinguishing water, and has no effect on the fire extinguishing activity.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a fire hydrant showing one embodiment of the present invention.

FIG. 2 is a plan view of a resistor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Valve box, 2 ... Inlet, 3 ... Bracket, 4 ... Outlet, 5
... Auxiliary valve body, 6 ... Main valve body, 6a ... Valve opening, 14 ... Main valve seat, 15 ... Resistor, 16 ... Slit

Claims (1)

[Claims] In a fire hydrant using a ball valve, a flow path from the ball valve to a water discharge port is made of a disc-shaped elastic body large enough to close the flow path, and goes from the center to the outer periphery. A fire hydrant provided with a resistor having a plurality of slits radially.