JP2000074239A - Gas emergency shut-off device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive gas emergency shut-off device having the low pressure loss in regular use and having a simple structure. SOLUTION: A pipe joint 1 having upper and lower opening parts 1b, 1c and a lateral opening part 1a perpendicular to them is provided, a ring-shaped stopper 4 formed of a low melting point metallic material is arranged on the opening part 1b, a spherical valve element 6 is locked on the stopper 4, a union collar 10 is attached to the opening part 1c, a valve seat 12 for receiving the valve element 6 is formed on the upper end opening part of the union collar 10, the opening part 1a is connected to gas piping, and the union collar 10 is connected to a gas meter. When the temperature in a gas emergency shut-off device rises in emergency such as fire, the stopper 4 is melted, the valve element 6 is dropped by its own weight and locked on the valve seat 12, and the upper end opening part of the union collar 10 is closed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas shutoff device in a gas passage, and more particularly, to a gas shutoff device for urgently shutting off a gas when a gas pipe becomes high temperature due to heat such as a fire.

[0002]

2. Description of the Related Art Conventionally, an emergency gas shutoff valve has been used to shut off a gas flow path for city gas, LP gas and the like in an emergency such as a fire. As a conventional emergency gas shutoff valve of this type, a spherical valve body and its receiving seat are provided at an end of a valve hole,
It is known that a ring made of a heat-deformable material is provided between the receiving seat and the valve body, and when the temperature is high, the ring expands and the valve body falls and is locked on the valve seat to close the valve. (See Japanese Utility Model Laid-Open No. 3-23265).

[0003]

In the above-mentioned emergency gas shut-off valve, members such as a receiving seat, a valve body, and a valve seat are interposed in the gas flow passage, so that the pressure loss in the gas flow passage becomes large and the parts are also reduced. There is a problem that the score is high and the cost is high.

The present invention has been made in view of the above points, and an object of the present invention is to provide an inexpensive gas shut-off device which has a small pressure loss during normal use, and has a simple structure.

[0005]

In order to achieve the above object, the present invention relates to a gas shut-off device connected between a gas pipe and a gas meter, wherein the gas shut-off device comprises upper and lower openings and a lateral opening orthogonal to the upper and lower openings. A ring-shaped stopper made of a low-melting metal material is disposed in the upper opening, a spherical valve body is locked in the stopper, and a union brim is provided in the lower opening. A valve seat for receiving the valve body is formed at the upper end opening of the union flange,
The lateral opening is connected to a gas pipe, and the union flange is connected to a gas meter.

Therefore, according to the first aspect of the present invention, gas is introduced into the pipe joint through the gas pipe connected to the opening of the pipe joint, and supplied to the gas meter from the lower opening through the union flange. Is done. When the temperature inside the gas shut-off device rises due to a fire or the like, the stopper melts and the valve body falls by its own weight, is locked by the valve seat, closes the upper end opening of the union flange, and the gas supply is shut off. When the valve is shut off, the gas pressure is higher upstream of the valve body, and the valve body is pressed against the valve seat by this pressure and does not float. Since the valve element and the stopper are always outside the gas flow path, the valve element and the stopper do not obstruct the gas flow, and the pressure loss can be reduced.

According to a second aspect of the invention, there is provided the gas shut-off device according to the first aspect, wherein the stopper is mounted in a plug screwed into the upper opening. is there.

[0008] For this reason, according to the second aspect of the present invention, the stopper and the valve element are set on the plug, and the valve element can be easily attached only by screwing the plug.
The replacement operation is also easy.

According to a third aspect of the present invention, there is provided the gas shutoff device according to the first aspect, wherein the stopper is directly attached to the upper opening.

Therefore, according to the third aspect of the present invention, since there is no threaded portion such as a plug, the sealing performance is improved and the safety is further improved.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a first embodiment of the gas shut-off device of the present invention. This gas shut-off device
A tee-type fitting 1 is provided, which has a lateral opening 1a, an upper opening 1b, and a lower opening 1c.
Are formed.

A plug 3 is screwed into the internal thread 2 of the upper opening 1b. At the upper end of this plug 3,
A lid 7 is attached. A ring-shaped stopper 4 made of a low-melting-point metal material is fixed to a convex portion 3a on the lower inner periphery of the plug 3. A spherical valve element 6 is provided in the hole 5 of the stopper 4.
Is partially fitted.

A union flange 10 is screwed into the inner peripheral thread 8 of the lower opening 1c of the pipe joint 1. The diameter of the valve hole 11 of the union flange 10 is smaller than the outer diameter of the valve body 6. A valve seat 12 having a tapered surface for receiving the valve element 6 is formed in the upper end opening of the union flange 10.

A union nut 13 is rotatably fitted to the lower end of the union flange 10. The union nut 13 is connected to an inlet of a gas meter (not shown).

A gas pipe (not shown) is connected to the opening 1a of the pipe joint 1, gas is introduced into the pipe joint 1, and is supplied to the gas meter through the union flange 10 from the lower opening 1c. When the temperature inside the gas shut-off device rises due to a fire or the like, as shown in FIG. 2, the stopper 4 melts and the valve body 6 falls by its own weight, and is locked by the valve seat 12 to open the upper end opening of the union flange 10. To close the valve hole 11. This shuts off the gas supply. When shut off, the gas pressure is higher upstream of the valve body 6, so that the valve body 6 is pressed against the valve seat 12 by this pressure and does not float.

As described above, in the gas shut-off device of the present embodiment, since the valve 6 is always outside the gas flow path G (see FIG. 1), the valve 6 and the stopper 4 obstruct the gas flow. And the pressure loss can be reduced.

Further, the plug 3 and the union brim 10 are screwed into and out of the tee-type pipe joint 1, and the valve 6 is inserted into the plug 3.
The opening 1a is connected to the gas pipe and the lower opening 1c is connected to the inlet of the gas meter, so that it can be easily attached to the inlet of the existing gas piping equipment. it can. The gas shut-off device after the shut-off operation can be used again by replacing the plug 3 (only the stopper 4 may be used).

FIG. 3 and FIG. 4 show a second embodiment of the gas shut-off device of the present invention, in which a convex portion 15 is provided along the inner periphery of the opening 1b at the upper part of the pipe joint 1. The plug 3 of the first embodiment is abolished by directly attaching the stopper 4 to the first embodiment. Lid 1 at the upper end of fitting 1
4 are provided.

Also in the second embodiment, when the temperature inside the gas shut-off device rises due to a fire or the like, as shown in FIG.
The stopper 4 melts and the valve body 6 falls under its own weight, and the valve seat 12
And the valve hole 11 is closed.

In the second embodiment, since the plug 3 can be eliminated, the structure becomes simpler, and since there is no threaded portion of the plug 3, the sealing performance is improved and the safety is further improved.

[0022]

As described in detail above, according to the first aspect of the present invention, since the stopper and the valve element are arranged in the opening at the upper part of the pipe joint, the valve element is always outside the gas flow path. Thus, the valve body and the stopper do not obstruct the gas flow, and the pressure loss in the gas shut-off device can be reduced. In addition, since ordinary pipe joints can be used, the structure is simple and can be manufactured at low cost, and the sealing portion can be minimized, so that the safety is high, and the lateral opening is a gas pipe,
Since the lower openings are respectively connected to the inlets of the gas meters, they can be easily attached to the inlets of existing gas piping facilities.

According to the second aspect of the present invention, the stopper is mounted in the plug screwed into the upper opening, so that in addition to the effect of the first aspect of the invention, the stopper and the valve element are provided on the plug. The valve body can be easily mounted simply by screwing in the plug, and the replacement operation can be easily performed for each plug.

According to the third aspect of the present invention, since the stopper is directly attached to the upper opening, it is not necessary to use a plug or the like in addition to the effect of the first aspect of the present invention. The number of seal portions is small, so that the sealability is good and the safety is higher.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing a first embodiment of a gas shut-off device of the present invention.

FIG. 2 is a vertical sectional side view of the gas shut-off device according to the first embodiment at the time of a shut-off operation.

FIG. 3 is a vertical sectional side view showing a second embodiment of the gas cutoff device of the present invention.

FIG. 4 is a vertical sectional side view of a gas shut-off device according to a second embodiment during a shut-off operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe joint 1a Lateral opening 1b Upper opening 1c Lower opening 3 Plug 4 Stopper 6 Valve body 10 Union flange 12 Valve seat

Claims (3)

[Claims] 1. A gas shut-off device connected between a gas pipe and a gas meter, comprising: a pipe joint having upper and lower openings and a horizontal opening orthogonal to the opening; A ring-shaped stopper made of a low melting point metal material is arranged, a spherical valve body is locked to the stopper, a union flange is attached to the lower opening, and the valve body is attached to an upper end opening of the union brim. A gas shut-off device, wherein a valve seat for receiving the gasket is formed, the lateral opening is connected to a gas pipe, and the union flange is connected to a gas meter. 2. The gas shut-off device according to claim 1, wherein the stopper is mounted in a plug screwed into the upper opening. 3. The gas shut-off device according to claim 1, wherein the stopper is directly attached to the upper opening.