KR100896089B1 - Double type valve apparatus for high-pressure container - Google Patents

Abstract

The present invention relates to a valve device of a high pressure vessel for storing compressed natural gas (CNG) or a fire extinguishing agent at a high pressure in a cylindrical body having a volume of about 1000 L (liter) or more, and more specifically, a high pressure gas. Repair and maintenance of the on-off valve by installing an after-sales valve to quickly and accurately shut off the leakage of the high-pressure gas stored inside the high-pressure container during repair or maintenance of the on-off valve installed for the discharge of the valve. At the same time, the maintenance and replacement work can be performed more easily and safely, and the leakage of gas generated during the operation is almost zero, enabling economic use of the high pressure container, and the overpressure as a safety valve according to the increase in the internal pressure of the high pressure container. By rupturing the two rupture discs inside the outlet, the rupture discs as safety valves can be used for It also minimizes the enormous amount of gas leakage caused by malfunctions due to fatigue loads due to shock and vibration or material defects, and the risk and economic loss of accidents.It is most suitable for high pressure containers used in mobile tube trailers. The present invention relates to a double valve device of a high pressure container so that the present invention can be applied.

To this end, the present invention is provided with a large-capacity high-pressure container (10) in which a high-pressure gas is stored in the cylinder-shaped body, the upper neck ring (11) of the high-pressure container (10) (Neck-ring) A valve body 13 having a gas discharge passage 14 formed therein is installed, and the valve body 13 has an on / off valve 17 for selectively discharging high pressure gas through a gas supply line 18 and a safety valve. In each of the overpressure discharge openings 19 with the rupture disk 30 incorporated therein as a valve, a gas control passage communicating with the gas discharge passage 14 is provided between the valve body 13 and the on-off valve 17. A set bolt 15 having an inner portion 16 is installed, and an A / S valve 20 for selectively opening and closing the gas control passage 16 is inserted into the set bolt 15. The A / S valve 20 is a valve connector 21 is fastened and installed on one side of the set bolt 15, the handle 22 And a valve stem 23 which is screwed along the valve connector 21 by the rotation of the valve connector 21, and a valve pin 24 formed at the tip of the valve stem 23, wherein the gas control passage 16 The valve seat 25 is fixedly installed in the valve seat 24 is inserted or removed in accordance with the rotation of the handle 22, the gas seat passage 16 by the valve pin 24 in the valve seat (25) A hole is formed to be opened and closed, and the inside of the overpressure discharge port 19 is characterized in that a pair of rupture disk 30 is inserted to be spaced apart at regular intervals by a spacer ring 31.

High Pressure Vessel, Valve Device, Overpressure Outlet, Burst Disc, Tube Trailer

Description

Double type valve apparatus for high-pressure container

1 is a side cross-sectional view of a part of a high-pressure container in which the double valve device according to the present invention is installed.

Figure 2 is a partially enlarged cross-sectional view showing the installation structure of the A / S valve forming the main portion of the present invention.

Figure 3 is a partially enlarged cross-sectional view showing the structure of the overpressure discharge port forming another main portion of the present invention.

<Explanation of symbols for main parts of drawing>

10: high pressure container 11: neck ring 12: container fixing flange

13 valve body 13a, 15a screw connection 13b, 21a nut

14 gas discharge passage 15 set bolt 15b valve connector

16 gas control passage 17 on-off valve 17a, 17b valve joint

18 gas supply line 19 overpressure outlet 20 A / S valve

21: valve connector 22: handle 23: valve stem

24: valve pin 25: valve seat 26: screw connection

27: sealing ring 28: backup ring 29: adapter

30 rupture disc 31 spacer ring 32 washer

33: Spinning Nut

The present invention relates to a valve device of a high pressure vessel for storing compressed natural gas (CNG) or a fire extinguishing agent at a high pressure in a cylindrical body having a volume of about 1000 L (liter) or more, and more specifically, a high pressure gas. Repair and maintenance of the on-off valve by installing an after-sales valve to quickly and accurately shut off the leakage of the high-pressure gas stored inside the high-pressure container during repair or maintenance of the on-off valve installed for the discharge of the valve. At the same time, the maintenance and replacement work can be performed more easily and safely, and the leakage of gas generated during the operation is almost zero, enabling economic use of the high pressure container, and the overpressure as a safety valve according to the increase in the internal pressure of the high pressure container. By rupturing the two rupture discs inside the outlet, the rupture discs as safety valves can be used for It also minimizes the enormous amount of gas leakage caused by malfunctions due to fatigue loads due to shock and vibration or material defects, and the risk and economic loss of accidents.It is most suitable for high pressure containers used in mobile tube trailers. The present invention relates to a double valve device of a high pressure container so that the present invention can be applied.

Generally, high-pressure containers for storing gaseous gases at high pressure, such as compressed natural gas (CNG) storage containers or fire extinguishing agents, are made of jumbo-shaped jumbo containers that are relatively large in size. The upper necking portion of the high pressure vessel is provided with a valve mechanism for selectively discharging the high pressure gas stored in the interior of the container as needed.

Representative examples of the valve mechanism installed in the high pressure vessel as described above, the gas discharge passage in a state in which the valve body formed with a gas discharge passage communicating with the internal space of the high pressure vessel is fixedly installed on the necking portion of the high pressure vessel, An on / off valve (mainly a ball valve is used) provided with an opening / closing handle at the outlet of the valve is installed as a parking end valve, and the valve body ruptures when the internal pressure of the high pressure container rises above a certain level by a fire or the like. At the same time as the disk is ruptured, an overpressure outlet as a safety valve is installed to automatically discharge the gas stored in the high pressure container.

However, the conventional valve device for a high pressure vessel according to the related art is a defective operation or air tightness of the on / off valve due to frequent operation of the on / off valve for selectively discharging the high pressure gas from the high pressure vessel and various shocks or vibrations applied to the high pressure vessel. When a situation such as leakage occurs, it is very difficult to immediately perform operations such as repair, maintenance or replacement of the on / off valve while preventing leakage of gas stored in the high pressure container.

In other words, since the on-off valve is the main discharge passage of the gas stored in the high-pressure container, when the operation such as opening or disconnecting the on-off valve should be preceded in the repair, maintenance or replacement of the on-off valve, the high-pressure container It is very difficult to easily and safely perform on-site repair, maintenance or replacement work of the on / off valve with the leakage of high pressure gas stored at a pressure of about 200 bar inside the valve quickly and accurately.

For this reason, the repair or maintenance of the on-off valve and the replacement of the high-pressure gas stored in the high-pressure container in the state that most of the work is discharged, and then refill the gas inside the high-pressure container is mainly made, Repair and maintenance of the on-off valve takes a lot of time and money, and the risk of noise and safety accidents due to gas release not only increases, but also the overall economic efficiency of the use of a high-pressure container is greatly reduced. There was this.

In addition, only one burst disk is installed at the overpressure discharge port of a conventional valve device for a high pressure vessel. When a sudden increase in the internal pressure of the high pressure vessel due to a fire or the like occurs, the burst disk bursts and gas stored in the high pressure vessel. It was possible to prevent the breakage of the high pressure container itself by releasing it.However, due to the accumulation of fatigue load caused by various shocks and vibrations applied to the high pressure container including repeated filling of gas, or the material defect of the ruptured disk itself, When the ruptured disk malfunctions under pressure, there is a problem in that a huge amount of gas discharged in the high-pressure container and the resulting risks and economic losses are very large.

In particular, more than 1000 liters (liters) of internal capacity are needed to smoothly fill gas fuel and supply fire extinguishing agents anytime and anywhere in an emergency regardless of the location of vehicles using fire fuel or the location of fire. A mobile tube trailer equipped with a large-capacity high-pressure gas container or a large-capacity extinguishing agent container on a trailer vehicle is widely used.

In the case of a large-capacity high-pressure container installed in the mobile tube trailer as described above, the damage of the on-off valve and the rupture disk as the parking stop valve occurs very frequently due to various shocks and vibrations caused by the operation of the trailer vehicle. In the same way, frequent repair, maintenance, and replacement of valves or failure to improve frequent malfunctions of the ruptured discs would result in significant economic losses in the use of high-pressure containers.

The present invention has been made to solve the conventional problems as described above, the double valve device for a high pressure vessel according to the present invention at the time of repair or maintenance of the on-off valve installed for the discharge of high-pressure gas or replacement of the on-off valve By installing the A / S valve to quickly and accurately cut off the leakage of the high pressure gas stored inside the high pressure container, repair and maintenance of the on-off valve can be performed more easily and safely, and occur at the same time. The first technical problem is to make the leakage of gas to be almost zero so that economic use of the high pressure container is possible.

In addition, the present invention is to install and detachably install the A / S valve with the set bolt on the gas discharge passage outlet side of the valve body is fastened to the neck ring of the high pressure container to connect the on-off valve, and then the set bolt The on / off valve is connected to the outlet side of the gas passage formed in the gas passage to ensure the compatibility of the A / S valve more widely and at the same time minimize the structural change of the pre-fabricated high pressure vessel. It is a second technical problem to be able to easily apply to various high-pressure containers.

Finally, the present invention is to ensure that the two rupture disk as a safety valve in accordance with the increase in the internal pressure of the high-pressure container to be built in the overpressure discharge port integrally formed with the valve body, the rupture disk as a safety valve is repeated charging of gas or various impact And the huge amount of gas leakage caused by malfunction of fatigue load due to vibration or material defect of the disk itself, and the risk of accident and economic loss caused by this, can also be minimized. It is a third technical problem to provide a valve device that can be most optimally applied to a large-capacity high-pressure container used for a mobile tube trailer.

The present invention for achieving the above technical problem, a large-capacity high-pressure container is provided with a high-pressure gas is stored in the cylinder-shaped body, the upper neck ring of the high-pressure container is provided with a valve body formed with a gas discharge passage therein The valve body is provided with an on-off valve for selectively discharging high pressure gas through a gas supply line, and an overpressure discharge port in which a rupture disk is incorporated as a safety valve, respectively, between the valve body and the on-off valve. A set bolt having a gas control passage communicating with the gas discharge passage is installed therein, and an A / S valve is inserted into the set bolt to selectively open and close the gas control passage, and the A / S valve is installed. The valve connector is fastened to one side of the set bolt, and screwed along the valve connector by the rotation of the handle It consists of a valve stem and a valve pin formed at the front end of the valve stem, the valve seat is fixed to the gas control passage in which the valve pin is inserted or removed in accordance with the rotation of the handle, the valve seat is attached to the valve pin A hole for opening and closing the gas control passage is formed, and a pair of ruptured disks are inserted to be spaced apart at regular intervals by a spacer ring.

Hereinafter, described in detail with reference to the accompanying drawings, the present invention for achieving the above object is as follows.

Figure 1 is a partial side cross-sectional view of a high-pressure container is installed double valve device according to the present invention, Figure 2 is a partially enlarged cross-sectional view showing the installation structure of the A / S valve forming the main portion of the present invention, Figure 3 It is a partially enlarged sectional view which shows the structure of the overpressure discharge port which comprises another main part.

The overall configuration of the high-pressure container including a double valve device according to the present invention, as shown in Figure 1, a large-capacity high-pressure container (10) in which the high-pressure gas is stored in the cylinder-shaped body Of the upper neck of the high-pressure container 10 (Neck-ring), that is, the narrow neck of the upper part of the container 10, on a frame or tube trailer for various equipment. The container fixing flange 12 for firmly fixing the high-pressure container 10 is coupled to.

The neck ring 11 serves as a primary discharge passage for the high pressure gas stored in the high pressure vessel 10 and also serves as a base for installing various valve mechanisms, and an upper end portion of the neck ring 11. The valve body 13 for the installation of the valve mechanism is fastened and installed through the center portion of the neck ring 11, the inside of the body of the valve body 13 to discharge the high pressure gas stored in the high pressure vessel (10). The gas discharge passage 14 for the passage is formed.

As described above, the gas discharge passage 14 formed in the valve body 13 is a passage leading to the on / off valve 17 side as the parking stop valve and a passage leading to the overpressure discharge port 19 in which the rupture disc is incorporated as a safety valve. The on / off valve 17 and the overpressure discharge port 19 are respectively connected to the outlet side of the passage, and the A / S valve 20 corresponding to the first main part of the present invention is set bolt 15. By) will be installed between the valve body 13 and the on-off valve 17.

The A / S valve 20 corresponding to the first main part of the present invention is a gas control passage communicating with the gas discharge passage 14 formed in the valve body 13 as shown in FIGS. 1 and 2, respectively. 16 is fastened to the upper end of the valve body 13 together with the set bolt 15 formed therein, the A / S valve 20 is the gas control passage 16 formed in the set bolt 15 To selectively open and close the function as needed.

In order to selectively open and close the gas control passage 16 of the set bolt 15 as described above, the A / S valve 20 is a valve connector 21 is fastened and installed on one side of the set bolt 15, The valve stem 23 (Valve stem) which is screwed rotationally moved along the inner surface of the valve connector 21 by the rotation of the handle 22 and the gas control passage formed on the tip of the valve stem 23 It is made of a valve pin 24 that is in close contact with the interior of the valve seat 25 inserted or fixed on the (16) or detached from the valve seat (25).

In order to operate the A / S valve 20, a nut part 21a for rotational movement of the valve stem 23 is formed along the inner circumferential surface of the valve connector 21, and the valve stem 23 is formed. On the outer circumferential surface of the body) is formed a screw coupling portion 26 that is screwed to the nut portion 21a of the valve connector 21, and the rear end of the valve stem 23 of the A / S valve 20 The handle 22 for operation is integrally connected and fixed to the valve stem 23.

The valve connector 21 may be screwed to one side of the set bolt 15, but in some cases may be installed to be fitted with the set bolt 15 in a state of preventing leakage packing, The valve connector 21 inserted into the set bolt 15 may be fixed to the set bolt 15 by a welding method, and the valve seat 25 may be fastened to the inside of the body of the set bolt 15 in the same manner. It can be fixed in a variety of ways, such as by formula, fit or adhesive.

In addition, in the case of the valve seat 25, although not shown in the drawings, a hole for communicating the passage 16 in upper and lower portions of the body of the valve seat 25 in contact with the gas control passage 16 is formed. The valve pin 24 and the valve seat 25 have a truncated conical shape in which the outer diameter and the inner diameter decrease toward the locking direction so as to achieve a more rapid and reliable valve operation by the rotation operation of the handle 22. It is preferable to form.

In particular, the valve pin 24 and the valve seat 25 may be rotationally rubbed in accordance with the operation of the handle 22 at the time of locking the valve 20, so that the valve seat 25 in place by the rotational friction force It is preferable to firmly fix the inside of the set bolt 15 so as not to swing. For this purpose, a rectangular protrusion is formed at the tip of the valve seat 25 in the drawing, and the rectangular protrusion is set bolt 15. It is tightly inserted into the square groove formed in the inside.

In addition, the valve pin 24 and the valve seat 25 may be made of a metal material such as copper having excellent lubricity and sealability, and the valve pin 24 may be made of metal or a hard plastic material. At the same time, the valve seat 25 may be made of a material such as elastic rubber, synthetic resin, or flexible plastic, but if the valve seat 25 can effectively open and close the gas control passage 16 of the set bolt 15. There are many other materials available.

And, immediately after the valve pin 24, the sealing ring 27 as an O-ring (O-ring) to block the high-pressure gas stored in the high-pressure container 10 to leak through the A / S valve 20 The backup ring 28 is interposed on the valve stem 23 together with the back-up ring, and the backup ring 28 is closed by the pressure of the gas stored in the high-pressure container 10. By compensating for the crushing or tearing, it serves to more safely block the gas leakage through the A / S valve (20).

In addition, the on-off valve 17 as the parking stage valve is fastened toward one side (right side in the drawing) of the set bolt 15 as shown in FIGS. 1 and 2 to serve as an outlet of the gas control passage 16. The valve connector 15b and the valve joint 17a are connected and installed. As described above, the opening and closing valve 17 is mainly used as a ball valve having a handle, but there are other various types of valves. Instead of the valve connector 15b, the outlet portion of the gas control passage 16 may be extended in the form of a pipe so that the open / close valve 17 is directly connected to the outlet pipe.

In addition, a gas supply line 18 connected to the on / off valve 17 by a valve joint 17b is installed at the outlet side of the on / off valve 17 to discharge the liquefied natural gas or the extinguishing agent to a place that requires it. The gas supply line 18 may be a metal pipe, preferably a copper pipe, a pipe of synthetic resin or plastic, or a flexible pipe such as a high pressure hose. have.

In addition, the structure of the overpressure discharge port 19 corresponding to the second main portion of the present invention, as shown in Figure 3, the valve body 13 of the gas discharge passage 14 passing through the body of the valve body 13 A pair of rupture disks 30 are spaced apart at regular intervals by a spacer ring 31 at the outlet end of the gas discharge passage 14 extending outwardly by a predetermined length from the side of the side, the pair Adapter 29 for tightly fixing the rupture disk 30 to the outlet side of the gas discharge passage 14 is fastened along the outlet outer peripheral surface of the gas discharge passage 14 with the washer 32 interposed therebetween. .

The rupture disk 30 is formed of a thin metal film having a disc shape similar to that of the conventional overpressure discharge port of a high pressure vessel valve device, and mainly to satisfy the discharge flow rate of the international standard AP520. Although a metal plate such as an aluminum plate is used, the most preferred embodiment of the rupture disc 30 is acetal (polyoxymethylene, polyoxymethylene: mechanical strength and oil resistance and abrasion resistance and repetition on both sides of a nickel-chromium plate that is resistant to fatigue load). And a thermoplastic resin resistant to load) is coated.

In addition, the adapter 29 extends by a predetermined length from the rupture disk 30 located at the right end of the figure so as to more securely protect the rupture disk 30 from various external factors to have a roughly screw socket shape. At the distal end of the adapter 29, a spinning nut 33 is fastened to assist the release of the high pressure gas through the gas discharge passage 14 when the rupture disk 30 is ruptured.

Lastly, in the dual valve device for a high pressure container according to the present invention, in addition to the screw fastening portions indicated by reference numerals 13a and 15a, the connection parts of the various components necessary for constituting the double valve device have a high pressure gas stored in the high pressure container 10. A packing not shown may be additionally provided as necessary to prevent leakage, and a known sealing material or coating sealant may be applied to the connection parts of each part to maintain sufficient airtightness of each connection part. It is desirable to make.

Hereinafter, the working relationship of the present invention having the above configuration will be described in detail with reference to the accompanying drawings.

First, when the liquefied natural gas or the extinguishing agent is charged to a high pressure inside the high pressure container 10 and the opening / closing valve 17 as the parking stop valve is normally operated, the gas control passage 16 formed in the set bolt 15 is provided. ) To maintain the open state by the A / S valve 20, the gas control passage (16) and the open / close valve (17) of the gas discharge passage (14) of the valve body (13) and the set bolt (15). Through it is possible to selectively discharge the gas stored in the high-pressure container (10).

In other words, when normal use of the high-pressure container 10 is possible, the handle 22 of the A / S valve 20 is rotated so that the valve stem 23 is leftward in the drawing in the state shown in FIGS. 1 and 2. The valve pin 24 at the tip of the valve stem 23 is separated from the valve seat 25, that is, the gas control passage 16 is opened by the A / S valve 20. The discharge of the high pressure gas and the blocking thereof are to be made by the on-off valve 17.

As described above, due to frequent operation of the on-off valve 17 and various shocks or vibrations applied to the high-pressure container 10 during normal use of the high-pressure container 10, such as a malfunction or leakage leakage of the on-off valve 17. In the case where a situation arises and the repair or maintenance of the on-off valve 17 or its replacement should be made, the handle 22 of the A / S valve 20 is rotated before that shown in FIGS. 1 and 2. As described above, the valve pin 24 at the tip of the valve stem 23 is firmly in contact with the inner surface of the valve seat 25, that is, the gas control passage 16 is closed by the A / S valve 20. The valve unit is set.

When the gas control passage 16 is set to the closed state by the A / S valve 20 as described above, the high pressure gas stored in the high pressure vessel 10 is the gas discharge passage 14 of the valve body 13. Since the gas is not discharged to the outside via the gas control passage 16 of the set bolt 15, such as opening or disconnecting the opening and closing valve 17 during repair, maintenance or replacement of the opening and closing valve 17. Even if work is to be performed, by operating the A / S valve 20, the high pressure gas stored at a pressure of about 200 bar inside the high pressure vessel 10 to quickly and accurately cut off the site in the field, the on-off valve 17 Repair, maintenance or replacement can be done very easily and safely in the field.

For this reason, during the repair or maintenance of the on-off valve 17 that becomes the parking stage valve and the replacement thereof, the operation is performed in a state where most of the high-pressure gas stored in the high-pressure container 10 is released, and then the high-pressure container 10 Compared with the conventional case of recharging the gas inside, the time and cost required for repair or maintenance of the on-off valve 17 and its replacement can be reduced to the maximum, and noise and Not only can the risk of safety accidents be significantly reduced, but the overall economics of the use of the high-pressure container 10 can be greatly improved.

In addition, by installing a pair of rupture disks 30 in the overpressure discharge port 19 of the valve device for the high pressure vessel 10, various shocks and vibrations applied to the high pressure vessel 10 including repeated filling of gas. Due to the accumulation of fatigue load or material defects in the bursting disc 30 itself, the other bursting disc 30 located on the outside even if one of the bursting discs 30 located on the inside under a predetermined pressure malfunctions. As a result, it is possible to block a meaningless release of the high pressure gas.

Therefore, due to the malfunction of the bursting disk 30, a significant amount of gas stored in the high-pressure container 10 is insignificantly released, and the risk and economic loss of the accident can be greatly reduced. Even if 30 is installed, since the installation interval between the burst disks 30 is narrow and the bursting strength (burst pressure) is also the same, each burst disk (when a predetermined pressure or more is concerned that breakage of the high-pressure container 10 is concerned) Since 30) is sequentially ruptured from the inside at about the same time, the inherent function of the rupture disc 30 can be achieved without any problem.

In particular, the double valve device according to the present invention is a high-pressure container for a tube trailer in which damage to the on-off valve 17 and the rupture disk 30 occurs as a parking end valve very frequently due to various shocks and vibrations caused by the operation of the trailer vehicle. It can be optimally applied to {a large-capacity container having an internal volume of 1000L (liter) or more}, and the A / S is provided on the outlet side of the gas discharge passage 14 of the valve body 13 to which the on-off valve 17 is connected. The valve 20 is detachably installed together with the set bolt 15, and then the on-off valve 17 is connected to the outlet side of the gas control passage 16 formed in the set bolt 15. In addition, the A / S valve 20 can be secured more widely and at the same time, the A / S valve 20 can be used in various high pressure vessels 10 within a range that minimizes structural changes of the pre-fabricated high pressure vessel 10. Being easily applicable to The.

As described above, the double valve device for a high pressure container according to the present invention is about 200 bar inside the high pressure container by the operation of the A / S valve before repair, maintenance or replacement of the on / off valve serving as the parking end valve. It is effective to quickly and accurately cut off the leakage of high pressure gas stored at the pressure of the degree, which makes it very easy and safe to carry out repair, maintenance or replacement of the valve on site. .

Therefore, when repairing or maintaining an on-off valve that becomes a parking stage valve and replacing it, the related work is performed in a state where most of the high-pressure gas stored in the high-pressure container is discharged, and then the gas is recharged inside the high-pressure container. Compared to the case, it is possible to reduce the time and cost required for repair, maintenance, and replacement of the on / off valve as much as possible, and also significantly reduce the risk of noise and safety accidents caused by gas release. Rather, there is an effect to greatly improve the overall economics of the use of the high-pressure container.

In addition, by installing a pair of rupture disks in the overpressure discharge port of the valve device for a high-pressure container, even if one of the rupture disks located on the inside under a certain pressure malfunctions due to various factors, the remaining one rupture is located on the outside The disk has the effect of blocking the insignificant release of high pressure gas, and as a result, a huge amount of gas stored in the high pressure container is insignificantly released due to the malfunction of the ruptured disc, and the risk and economic loss of the accident are greatly increased. There is an effect that can be reduced.

In particular, there is an effect that can be optimally applied to the high-pressure container for the tube trailer, the damage of the on-off valve and the bursting disk as the parking stage valve due to various shocks and vibrations due to the operation of the trailer vehicle, The A / S valve is installed detachably together with the set bolt on the gas discharge passage outlet side of the valve body to which the valve body is connected, and then the on / off valve is connected to the gas control passage outlet side of the set bolt. The A / S valve can be easily applied to various high pressure containers within the range of ensuring the compatibility of the S valve more widely and minimizing the structural change of the pre-fabricated high pressure container.

Claims (2)

delete A large-capacity high-pressure container (10) having a high-pressure gas is stored inside the cylinder-shaped body, and the upper neck ring (11) (Neck-ring) of the high-pressure container (10) gas discharge passage (14) A valve body 13 formed therein is installed, and the valve body 13 has an opening / closing valve 17 for selectively discharging the high pressure gas through the gas supply line 18 and a rupture disk 30 as a safety valve. In that the overpressure discharge ports 19 with built-in are respectively connected and installed, Between the valve body 13 and the open / close valve 17, a set bolt 15 having a gas control passage 16 communicating therewith with the gas discharge passage 14 is provided therein, and on the set bolt 15. A / S valve 20 for inserting and opening the gas control passage 16 selectively is inserted into the fastening type, The A / S valve 20 is a valve stem 21 screwed along the valve connector 21 by the rotation of the handle 22 and the valve connector 21 is fastened to one side of the set bolt (15). (23), and the valve pin 24 formed at the tip of the valve stem 23, The valve seat 25 is fixedly installed in the gas control passage 16 in which the valve pin 24 is inserted or removed in accordance with the rotation of the handle 22. The valve seat 25 is provided by the valve pin 24. A hole for opening and closing the gas control passage 16 is formed, The inside of the overpressure discharge port 19, a pair of rupture disk 30 is inserted into the spacer valve 31 so as to be spaced apart at regular intervals, characterized in that the double valve device for a high pressure vessel.

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