JPH07894Y2 - Gas valve with built-in safety valve - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial field of application) The present invention relates to a gas meter for LP gas or the like, and particularly to prevent a meter failure due to abnormal pressure and other damages of gas equipment. The present invention relates to a gas meter with a built-in safety valve.

(Prior Art) LP gas is provided with an intermediate-pressure gas meter in the middle of the gas pipe supplied from the LP gas container through a pressure regulator, and the gas is supplied to the end combustion equipment side via this gas meter.

In this type of LP gas supply system, abnormal pressure is generated due to reliquefaction of gas in the gas meter, and this abnormal pressure may cause trouble.

This reliquefaction phenomenon means that the LP gas vaporized in the LP gas cylinder is liquefied again due to the temperature drop due to the temperature difference between the pipes. Then, after the reliquefaction phenomenon occurs, if the temperature rises and the gas is vaporized and the pressure rises, an abnormal pressure rise occurs in the pipe and the inside of the equipment, which eventually causes damage.

The cause of this reliquefaction phenomenon is that the pressure in the gas container directly contacts the equipment due to the LP gas supply system itself or the failure of the regulator.In any case, this reliquefaction phenomenon causes the operation of the medium pressure gas meter. There is a risk of failure, damage, or damage to other connected devices.

As a means to prevent damage to the gas meter itself due to this type of reliquefaction, conventionally, a protector for preventing meter breakage due to abnormal pressure is provided at the joint flange connection part of the upper case and the lower case that constitute the gas meter, and We are reinforcing.

(Problems to be solved by the invention) However, even if this kind of reinforcement is performed, the case is made of a thin iron plate, the case swells due to the increase in gas supply pressure, and finally the connection part comes off and the meter becomes immobile. There was a fear of becoming.

In some cases, instead of the iron plate, the case is made of aluminum die casting to improve the strength.

However, even with this structure, there is a limit to the pressure resistance, and if the limit is exceeded, there is a risk that sudden destruction will occur, which in turn increases the risk.

This invention is to improve the above-mentioned drawbacks and to release a gas to the outside when the internal pressure of the gas meter exceeds a predetermined value, and to keep the internal pressure within a set value. The purpose is to provide.

[Means for Solving the Problems] (Means for Solving the Problems) In order to achieve the above object, a gas outlet communicating with the atmosphere side is formed in the vicinity of a gas inlet port of a gas meter, and the gas outlet is formed by a spring. The safety valve is constituted by a valve housing having a nozzle portion, a valve element provided inside the valve housing, and a spring for urging the valve element toward the nozzle portion. The gas meter with a built-in safety valve is characterized in that the gas can be released to the outside when the internal pressure of the gas meter exceeds a predetermined value.

(Function) When the gas pressure supplied into the case through the gas inlet is abnormally high, the spring-type safety valve opens to discharge the gas to the atmospheric pressure side and remove the excess pressure, Keep within the set pressure.

(Embodiment) An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an LP gas supply system to which the present invention is applied.

In the figure, a pressure regulator 2 is provided at the supply port of the LP gas cylinder 1.
Is connected to the inside of the pressure regulator 2, and the LP gas, which has been decompressed in the pressure regulator 2 and has an intermediate pressure, is supplied to the inside of the gas meter 4 through the pipe 3, and after being metered therein, the pipe 3 is again used.
Is supplied to the combustion equipment 5 side at the end.

As shown in FIG. 2, the gas meter 4 includes an upper case 7 having a gas inlet port 6a and a gas outlet port 6b.
And a lower case 8 constituting a measuring chamber, both of which are airtightly flange-joined.

The upper case 7 is divided into an inner unit room 7a and an integrating meter room 7b that is airtightly divided from the inner unit room 7a.

The gas supplied to the inside of the upper case 7 through the gas inlet port 6a enters the measuring chamber on the lower case 8 side through the inner unit chamber 7a, and expands and contracts the membrane plate (not shown) provided in the measuring chamber alternately, thereby According to the contraction, the gas is supplied to the downstream side through the gas outlet port 6b.

Then, the reciprocating motion of the ring or the like is converted into a rotary motion in the inner unit chamber 7a along with the expansion and contraction motion of the membrane plate, the valve is opened and closed with respect to the membrane plate, and at the same time, the rotary motion is transmitted to the accumulating chamber 7b side, A multi-digit integrating counter (not shown) provided here is rotated one direction to display this value.

In the above gas meter, a spring type safety valve (hereinafter simply referred to as a safety valve) near the gas inlet port 6a of the upper case 7
Ten are provided.

This safety valve 10 is provided in the vicinity of the gas inlet port 6a, a valve housing 12 in which one is opened to the atmosphere side and the other is formed with a nozzle portion 11 opening to the inner unit chamber 7a, and the inside of the valve housing 12. A valve body 14 and a spring 15 that constantly urges the valve body 14 toward the nozzle portion 11 to close the nozzle portion 11;
The adjusting screw 16 is screwed into the spring 12 and comes into contact with the other end of the spring 15.

A gas discharge port 16a is formed in the screw 16, and when the valve body 14 releases the nozzle portion 11, the gas supplied to the inside of the inner unit chamber 7a is discharged to the atmosphere side.

The spring pressure of the spring 15 is set such that the spring 15 bends when the internal pressure of the inner unit chamber 7a exceeds the set upper limit value.

Therefore, as long as the gas having the normal pressure is supplied to the inside of the inner unit chamber 7a, the safety valve 10 is closed, and the normal state measurement and integrated display are performed.

Further, when a reliquefaction phenomenon occurs due to a failure of the pressure regulator 2 or other causes from this state and abnormally high pressure gas is supplied into the gas meter 4, the valve body 14 is passed through the nozzle portion 11.
When gas pressure is applied to the valve, the spring 15 is bent and the valve element 14 is retracted,
Open the nozzle part 11 and open the gas outlet 16a from the valve housing 12.
Through the atmosphere.

As a result, the inside of the gas meter 4 is kept within the set pressure, and the safety of the gas meter 4 and the gas downstream side pipe 3 and the combustion device 5 thereafter are maintained.

The valve housing 12 of the safety valve 10 may be integrated with the upper case 7 as a matter of course.

[Effects of the Invention] As described in detail with reference to the embodiments above, in the gas valve with a built-in safety valve of the present invention, when the internal pressure of the gas meter exceeds a predetermined value, the gas is discharged to the outside, Is maintained within the set value, the safety of the gas meter itself is maintained even if the gas pressure rises abnormally due to re-liquefaction, etc., and the downstream side equipment after the gas meter is prevented from being destroyed. it can.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an LP gas supply system to which the present invention is applied, and FIG. 2 is a schematic explanatory diagram of a gas meter with a built-in safety valve. 4 …… Gas meter 6a …… Gas inlet port 10 …… Spring type safety valve 11 …… Nozzle 12 …… Valve housing 14 …… Valve body 15 …… Spring 16 …… Adjustment screw 16a …… Gas outlet

Claims (1)

[Scope of utility model registration request] 1. A gas discharge port communicating with the atmosphere is formed near a gas inlet port of a gas meter, and the gas discharge port is closed by a spring type safety valve. A valve housing having
A valve body provided inside the valve housing and a spring for urging the valve body toward the nozzle portion, so that the gas can be released to the outside when the internal pressure of the gas meter exceeds a predetermined value. A gas meter with a built-in safety valve.