KR100503990B1 - Pressure reducing closed emergency shutoff valve with shutoff function - Google Patents

Abstract

According to the data submitted by the Korea Gas Safety Corporation to the National Assembly's Industrial Resources Committee, the gas is shut off in case of fire in LPG charging station and city gas constant pressure chamber.

The present invention relates to a pressure-sensitive closed emergency shutoff valve having a shut-off function for use in the manufacture, storage, sale and use of flammable or toxic substances, and in the event of a fire, a pressure-reduced closed emergency shutoff valve installed in a floor or a pipe trench. Decompression closed emergency shutoff with a shut-off function that can quickly shut off the decompression closed emergency shutoff valve when a flame is formed in the upper part of the valve and when a flame is formed at a distance away from the decompression closed emergency shutoff valve. It is an object to provide a valve.

To this end, the pressure reducing closed emergency shutoff valve 101, the operation pipe 102 coupled to the operation pipe connecting hole of the pressure reducing closed emergency shutoff valve 101, and the union 109 coupled to the end of the operation pipe 102. ), A branch pipe 110 branched from the operation pipe 102, and a mechanical heat sensor are coupled to the branch pipe 110 to provide a pressure reducing closed type emergency shutoff valve having a shut-off function. It has the effect of maximizing the fire detection capability of the pressure reducing closed emergency shutoff valve.

In addition, the mechanical heat detector is recognized by the user for many years that there is no malfunction in the case of non-fire, so the present invention is the only way to prevent damage caused by malfunction in the shut-off device of the pipeline in case of fire, city gas meter In the event of a fire in the city gas supply system such as ground and city gas constant pressure chamber, the gas is automatically shut off and extinguished to protect human life and minimize damage to the device. The reason is that in the event of a fire that malfunctions, the shut-off device in the pipeline cannot be used in the city gas supply system.

Description

Pressure reducing closed emergency shutoff valve with shut-off function

The present invention is a pressure reducing closed emergency shutoff valve for use in the production, storage, sale and use of flammable or toxic substances, automatically reducing the pressure reducing closed emergency shutoff valve when a disaster such as fire or explosion occurs. It is related with a pressure reducing closed emergency shutoff valve having a shut-off function that is closed to minimize damage of flammable or toxic substances to reduce damage.

※ The related art related to the pressure reducing closed emergency shutoff valve with an auto shutoff function is as follows.

① The conventional technology related to a pressure reducing closed emergency shutoff valve with an auto shutoff function is a pressure reducing closed emergency shutoff valve. The pressure reducing closed emergency shutoff valve has a diaphragm control valve using a diaphragm in the drive section and a cylinder control valve using a cylinder in the drive section.The valve disk opens when the fluid pressure is supplied to the drive section, and the valve disk closes when the fluid pressure is lost. Refers to diaphragm control valve and cylinder control valve.

2 is a cross-sectional view of the cylinder operation valve, and the cylinder operation valve most widely supplied as a pressure reducing closed type emergency shutoff valve supplies fluid pressure into the cylinder 16 through the operation pipe connection hole 11 so that the valve is always open. In the emergency shutoff, the valve is closed by the force of the spring 14 when the pressure of the fluid supplied in the cylinder 16 is released to the atmosphere to remove the pressure. The characteristic of the cylinder operation valve is that it operates in a direction that is always closed by the fluid pressure and the force of the spring 14. The cylinder inlet 12 is completely closed under any conditions by making the valve inlet 12 a safety side. The valve can be opened with a small force regardless of the pressure or the back pressure.The Teflon is used for the seat packing (13) for complete air tightness, and the cylinder (16) as the driving part is separated from the inside of the valve receiving the fluid pressure. The parts can be replaced without being discharged. If the ambient temperature rises above 75 [deg.] C, the fusible 15 in the lower part of the cylinder 16 melts and the fluid pressure in the cylinder 16 is removed. The valve closes, and the precautionary point when installing is to apply the principle of check valve, so only the fluid flowing from one side cannot be blocked. Therefore, the side to be protected at the time of mounting should be the valve inlet side 12. The check valve is a valve that allows the fluid to flow in one direction only and prevents it from flowing in the opposite direction, and has a switch type and a lift type. It is also called a valve or check valve. For example, the check valve installed at the outlet of the water supply pump prevents the backflow of water when the pump is stopped. The check valve is widely used in mechanical equipment such as gas equipment, fire fighting equipment, water supply equipment, air conditioning equipment, and chemical plants. The cylinder control valve applies the principle of the lift type check valve, and the difference between the lift type check valve and the lift type check valve allows the fluid to flow in only one direction, but the cylinder control valve is always open. Fluid in both directions, and the valve inlet of the lift check valve It corresponds to the valve outlet 23 of the operation valve. When fluid flows from the valve inlet 12 of the cylinder operating valve to the valve outlet 23, the fluid pressure supplied to the cylinder 16 is released into the atmosphere during the shutoff operation to remove the pressure, which acts on the disk 22. When the fluid is closed by the fluid pressure and the force of the spring 14, on the contrary, when the fluid flows from the valve outlet 23 to the valve inlet 12, the fluid pressure is lowered to the lower part of the disk 22 according to the principle of Pascal during the blocking operation. As a result, the disk 22 rises, making it impossible to abolish. The side to protect the cylinder operation valve is a part which should not allow the release of flammable or toxic substances into the atmosphere in the event of an accident, for example in the case of an LPG filling station. The side to be protected during installation becomes the LPG storage tank, the storage tank should be installed at the valve inlet 12 side, and the gas charger should be installed at the valve outlet 23 side. When the flow of gas flows or a fire occurs, the cylinder operation valve is abolished during shutoff operation, and when gas flow is stopped and the residual gas in the pipe of the valve outlet 23 is burned, extinguishing is performed to ensure safety. On the contrary, if the storage tank is installed on the valve outlet 23 side, the flow of gas from the storage tank to the gas filling machine is impossible to close the cylinder operation valve, which leads to the expansion of the fire. In addition, the side of the underground supply base of Ahyeon, Mapo-gu, Seoul, which occurred on Dec. 07, 1994, is to be protected when the main pipe is installed on both sides of the city gas meter, and the cylinder operation valve is the inlet and outlet of the meter. If the accident occurs in the meter, the cylinder jaw valve installed at the inlet side of the meter should be closed. There occurs a backflow in the outlet-side group the main pipe. The main pipe of the outlet side is of enormous length, so the main outlet of the meter should be regarded as a large gas tank. The cylinder operation valve installed at the meter inlet side should normally allow city gas to flow from the valve inlet 12 to the valve outlet 23, and the cylinder operation valve installed at the meter outlet side will normally have the city gas at the valve outlet 23. It must flow to the valve inlet 23. If it is installed in reverse, the cylinder operation valve cannot be closed, leading to an increase in fire. For this reason, the valve inlet 12 becomes the safety side. Safety means the following: 12 people died and 10 people were injured due to an explosion in the underground supply base. It destroyed copper, and 93 vehicles were damaged. In the event of such an accident, the peg of the cylinder operating valve is to ensure normal operation and to prevent or reduce the human and property damages caused by this. 12 workers die at the underground supply base, and in the event of an explosion at the LPG station, It is also worth noting that there is a high probability of leading to the death of skilled workers, due to the fact that there is a gap in the number of incident-finding staff for a certain period of time. Also note that the structure of the gas handling facility is composed of non-combustible materials. I am extinguishing the fire extinguishing method to stop extinguishing gas by closing the valve in case of leakage of flammable gas. However, the name of the fire extinguishing is used, and in order to prevent the explosion of the tank in the event of a fire in the flammable gas storage tank, it is necessary to release a large amount of flammable gas from the storage tank to the atmosphere within 30 minutes to burn and remove it. Engineering doesn't define this as a fire extinguishing method, but I've used it as the extinguishing or decomposition fire extinguishing since the 20th century, and this is possible because the upper space of the building we live in is infinite. I don't understand well, for example, exercise If there is a fire in the 1000 [t] LPG storage tank installed at the center of the cabinet, if the bomb is dropped into the storage tank, LPG will be removed within a minute, and if there is no gas, there will be no material to be burned, so that fire extinguishing will naturally occur. Will be. In case of an accident, it is recommended to refer to the person who has little practical experience what will happen after the cylinder valve is removed.

(3) Attached FIG. 12 is a schematic diagram of a pressure reducing closed emergency shutoff valve remote control device, which is installed in a storage facility of flammable gas such as LPG and ammonia, and stores compressed air and a compressor 108 for generating compressed air. An air tank 107, a pressure reducing closed emergency shutoff valve 101 for blocking leakage of flammable gas in an emergency, an operation pipe 102 connecting the driving unit of the emergency shutoff valve 101 and an air tank 107, The stop valve 106 provided in the operation pipe 102, the branch pipe 103 branched from the operation pipe 102, the pressure gauge 104 provided in the branch pipe 103, and the emergency valve 105 are included. It is configured by.

Its operation is to supply compressed air from the air tank 107 through the control tube 102 to the cylinder or diaphragm, which is the driving part of the emergency shutoff valve, so that the emergency shutoff valve 101 is always open and combustible gas. In the event of a disaster such as leakage, fire, explosion, etc., the emergency valve 105 is opened to release the air pressure supplied to the driving portion of the emergency shutoff valve 101 to the atmosphere to remove the pressure. (101) is closed.

In addition, when the ambient temperature of the emergency shut-off valve 101 rises above 75 [° C.], the emergency shut-off valve 101 is automatically closed by melting the available electric power installed in the drive unit of the emergency shut-off valve 101 and removing the air pressure. In addition, the compressor 108 and the air tank 107, which are components of the emergency shutoff valve remote control device, may be replaced with a nitrogen or carbon dioxide container in which a pressure regulator is installed, and a manual portable air compressor may be used.

The data submitted to the Korea Gas Safety Corporation to the National Assembly's Industrial Resources Committee on the decompression closed emergency shutoff valve remote control device is as follows. The current safety and business management legislation of liquefied petroleum gas specifies a manual shut-off method for installing an emergency shut-off device and operating it at a distance of more than 5 [m], and 99 [%] of LPG filling stations adopt a gas pressure type. In addition, when the gas shutoff is generated during this charging operation, the gas is cut off and the operation is prevented. There may be problems such as adverse effects. It is said. In other words, the current pressure reducing closed emergency shutoff valve remote control device is obviously a manual shutoff method in the event of a fire, but it is not wrong to say that it is an auto shutoff method. The reason is that the probability of blocking automatically is extremely small but can be blocked automatically.

※ Problems of the conventional pressure reducing closed type emergency shutoff valve are as follows.

Pressure reducing closed type emergency shutoff valve is installed in the bottom or inside the pipe trench.In case of installing on the bottom, if a flame is formed on the upper part of the pressure reducing closed type emergency shutoff valve in case of a fire, hot air As it descends down, the available heat in the drive section of the pressure-reduced closed emergency shutoff valve is cooled by cold air, so that the available electric charge does not melt, so that the pressure-reduced closed emergency shutoff valve cannot be shut off or it takes a lot of time to shut down. . In case of installation inside the underground pipe trench, if a flame is formed in the upper part of the pipe trench at the time of fire, the upper part of the pipe trench is cooled by cold air. The radiant heat from the formed flame is blocked by the pipe trench, so that it does not directly act on the pressure reducing closed emergency shutoff valve installed inside the pipe trench, so that the available electric charge in the drive portion of the pressure reducing closed emergency shutoff valve is kept at a low temperature. The pressure reducing closed emergency shutoff valve does not automatically shut off because it does not melt. In addition, if a flame is formed at a position away from the decompression closed emergency shutoff valve in the event of a fire, the fusible charge in the driving portion of the decompression closed emergency shutoff valve is kept at a low temperature. There is a disadvantage that can not be blocked.

In the present invention, in view of the conventional problems as described above, when a fire is formed in the upper part of the pressure-sensitive closed emergency shutoff valve installed on the floor or inside the pipe trench at the time of fire and a certain distance or more from the pressure-reduced closed emergency shutoff valve It is an object of the present invention to provide a pressure-sensitive closed emergency shut-off valve having a shut-off function that can be quickly shut off when the flame is formed in a remote position.

The construction and operation will be described in detail with reference to the accompanying drawings for the pressure-reducing closed emergency shutoff valve having a shut-off function implemented in the present invention to achieve the above object.

※ In order to achieve the object of the present invention, the coupling relationship between the components and components of the pressure reducing closed type emergency shutoff valve having a shut-off function implemented in the present invention is as follows.

A description will be given with reference to the accompanying drawings, FIGS. 17 and 2 to 5.

17 is a schematic diagram of a pressure reducing closed emergency shutoff valve with a shut-off function using a thermosensitive valve, and FIGS. 2 and 3 are schematic diagrams of a pressure reducing closed emergency shutoff valve with a shut-off function using a closed sprinkler head, and FIG. 5 is a schematic diagram of a pressure reducing closed emergency shutoff valve system having a shut-off function using vacancy, and FIG. 5 is a schematic diagram of a reduced pressure closed emergency shutoff valve system having a shut-off function using an available alloy pipe. The pressure reducing closed emergency shutoff valve includes a pressure reducing closed emergency shutoff valve 101; An operation pipe (102) coupled to the operation pipe connection hole of the pressure reducing closed emergency shutoff valve (101); Union 109 coupled to the end of the operation tube 102; A branch pipe (110) branched from the manipulation pipe (102); Characterized in that it comprises a mechanical heat detector coupled to the branch pipe 110, the pressure reducing closed emergency shutoff valve 101 is a cylinder operation valve or a diaphragm operation valve is used, the mechanical heat detector is a closed sprinkler A head 201, a fusible wire 301, a fusible alloy pipe 401, a thermosensitive valve 801, and the like are used.

※ Embodiment of the pressure-reduced closed type emergency shutoff valve with a shut-off function implemented in the present invention to achieve the above object is as follows.

① In order to achieve the object of the present invention, the action of each component in the coupling relationship between the components and components of the pressure-sensitive closing type emergency shutoff valve having a shut-off function implemented in the present invention, and the pressure-sensitive closing with a shut-off function Basic data for reproducing the type emergency shutoff valve are as follows.

A description with reference to the accompanying drawings FIG. 17 and FIGS.

1 is a cross-sectional view of a cylinder operation valve.

The pressure reducing closed emergency shutoff valve 101 is a diaphragm operation valve using a diaphragm in the drive unit and a fluid supply to the drive unit of the cylinder operation valve using the cylinder 16 in the drive unit when the valve disc is opened and the fluid pressure is lost. It refers to the diaphragm control valve and cylinder control valve, which act to close the valve disc.

The operation pipe 102 is a pipe that is coupled to the operation pipe connecting hole 11 of the pressure reducing closed emergency shutoff valve 101 driving unit and supplies a fluid pressure to the driving unit.

The union 109 is coupled to the end of the operation tube 102 is coupled to the fluid pressure supply pipe, the union 109 is a prefabricated pipe joint by a nut to facilitate the connection of the operation pipe 102 and the fluid pressure supply pipe. ).

The branch pipe 110 branched from the control pipe 102 and serves to connect the control pipe 102 and the mechanical heat sensor.

The mechanical heat sensor is opened when the ambient temperature rises during a fire, and releases the fluid pressure into the atmosphere. As a result, the fluid pressure of the pressure reducing closed emergency shutoff valve 101 is lost, and the reduced pressure closed emergency shutoff valve 101 is automatically opened. Acts to close it,

The mechanical heat detector is a tube that is made of low melting material with low melting point and release of fluid pressure into the atmosphere by automatically opening, discharging, or releasing the thermal element blocking the discharge port at a constant temperature. In this case, the thermal element refers to a portion that blocks the discharge port in a normal state, but when it reaches a certain temperature by heat, it destroys and dissolves itself, is released from the discharge port, and the discharge port is opened to operate to release the fluid pressure into the atmosphere. There are many types of mechanical heat detectors and the number is increasing.

The mechanical heat detector uses a closed sprinkler head 201, a potable 301, a fusible alloy pipe 401, a heat-opening valve 801, etc., and the closed sprinkler head 201 is a waterproof hole in a normal state. Refers to a sprinkler head in which the nozzle opening is opened by automatically destroying, dissolving or releasing the heat at a certain temperature, which is prescribed in Article 2 (Definition of Terms) of the Type Approval and Certification Technique of the Sprinkler Head (KOFEIS 0501). The soluble 301 refers to a plug filled with a soluble alloy made of lead, tin, antimony, cadmium, bismuth, etc. in the center thereof, and the soluble alloy pipe 401 is a soluble alloy. The pipe refers to a heat-opening valve 801 in which the valve is closed in a normal state, and the valve is opened by breaking, melting, or leaving the heat-sensitive body at a constant temperature.

The area of the detection zone to effectively detect fire in the event of a fire in the place where the pressure reducing closed emergency shutoff valve 101 is installed is called the boundary area, and the closed sprinkler head 201 and one available field 301 are in charge. The boundary area shall be 10 [㎡] or less, and the height of the attachment surface of the closed sprinkler head 201 and the fusible head 301 shall be 5 [m] or less from the floor so that the fire can be effectively detected. The alloy pipe 401 has a horizontal distance between the fusible alloy pipe 401 and each part of the sensing zone to be 2 [m] or less, and the height of the surface of the fusible alloy pipe 401 is 5 [m] or less from the floor. It should be installed to detect fire effectively. By doing so, it is possible to maximize the fire detection capability of the conventional pressure reducing closed emergency shutoff valve (101).

② How to use the pressure reducing closed emergency shutoff valve with auto shutoff function is as follows.

1. It demonstrates with attached drawing (FIGS. 6-8). FIG. 6 is a schematic diagram of an emergency shutoff valve shutoff device using a closed sprinkler head, FIG. 7 is a schematic diagram of an emergency shutoff valve shutoff device using available electric power, and FIG. 8 is a schematic diagram of an emergency shutoff valve shutoff device using an available alloy pipe. . This is to explain the pressure-reduced closed type emergency shutoff valve having an auto shutoff function powered by air pressure.

The operation preparation method of this procedure is to fill the air tank 107 by the air compressor 108, and then open the stop valve 106 so that the scale at the pressure gauge 104 can be reduced-pressure closed emergency shutoff valve 101. The stop valve 106 is closed while keeping it within the operating pressure range of the drive section (generally 1 to 5 [Kgf / cm 2)).

The operation test method sequence is normal when the pressure reducing closed emergency shutoff valve 101 is closed within two seconds of opening the emergency valve 105. In the event of a fire, the operation sequence of the closed sprinkler head 201 and the fusible 301 is opened by heat, or when the soluble alloy pipe is melted by melting, the compressed air in the operation pipe 102 is released, Emergency shutoff valve 101 is automatically closed. In addition, the air pressure used as the power of the pressure reducing closed emergency shutoff valve 101 generally uses air pressure, nitrogen gas pressure, and carbon dioxide gas pressure, and the emergency valve 105 is an operation valve of the pressure reducing closed emergency shutoff valve.

2. The accompanying drawings will be described with reference to FIG. Fig. 9 is a schematic diagram of an emergency shutoff valve shut-off device using hydraulic power and using a closed sprinkler head. This is to explain the pressure-reduced closed type emergency shutoff valve with a hydraulic shutoff function.

The operation preparation method sequence of this is that when the hydraulic pump 502 is operated, the pressure on the discharge side of the hydraulic pump 502 is kept constant by the relief valve 503, and the stop valve 106 is opened to open the pressure gauge 104 at the pressure gauge 104. The scale of the valve is within the operating pressure range of the pressure reducing closed emergency shutoff valve 101, and the stop valve 106 is closed. The operation test method sequence is normal when the emergency valve 105 is opened, the oil inside the operating tube 102 is discharged into the oil tank 501, and the pressure reducing closed emergency shutoff valve 101 is closed within 2 seconds. In the event of a fire, when the closed sprinkler head 201 is opened by heat, the oil inside the operating tube 102 is released into the atmosphere, and the pressure reducing closed emergency shutoff valve 101 is automatically closed. In addition, the hydraulic pressure to be used as the power of the pressure-reducing closed emergency shutoff valve 101 is generally used, such as hydraulic pressure, hydraulic pressure, water and oil mixed fluid pressure.

3. Description will be made with reference to the accompanying drawings (FIGS. 13-16). FIG. 13 is a sectional view of a glass bulb-type heat-opening valve, and FIG. 14 is a sectional view of a fusible-link type heat-opening valve. The heat sensing performance of the thermosensitive valve is the same as that of the closed sprinkler head 201 and detects heat and opens the valve. Fig. 15 is a schematic diagram of an emergency shutoff valve shut-off device using hydraulic pressure as a power source and a thermosensitive valve, and in the event of a fire in this case, a small amount of oil inside the operating pipe 102 is opened when the thermosensitive valve 801 is thermally opened. The air is released into the atmosphere and the pressure reducing closed emergency shutoff valve 101 is automatically closed. However, in the case of using flammable liquids such as hydraulic fluid as the working fluid, there is a danger of spreading the fire if the flammable liquid is released into the atmosphere during a fire.

In order to prevent this, as shown in the schematic diagram of the emergency shutoff valve shut-off device with the hydraulic pressure of FIG. 16 as a power source, the oil inside the operating tube 102 is returned when the thermal-opening valve 801 heats and opens. If returning to the oil tank 501 through the pipe 802, there is no risk of expanding the fire even if flammable liquid is used as the working fluid.

The operation sequence of the glass bulb type thermo-opening valve of Fig. 13 is as follows. When the ambient temperature of the glass bulb type thermosensitive valve reaches a constant temperature due to heat, the disk 915 may be broken when the glass bulb 921 is destroyed due to expansion of the liquid in the glass bulb 921 or an increase in the vapor pressure. When the glass bulb-type thermosensitive valve opens, the fluid pressure at the valve inlet 919 of the glass bulb-type thermosensitive valve rises by more than a predetermined pressure, so that the load acting on the disk 915 causes compression of the glass bulb 921. When the load is reached, the glass bulb 921 is broken, and the disk 915 is raised to open the glass bulb-type thermosensitive valve.

The operation sequence of the fusible-link type thermosensitive valve of Fig. 14 is as follows. When the ambient temperature of the fusible-link type thermosensitive valve reaches a constant temperature due to heat, the fusible material 903 is dissolved, and when the fusible material 903 is dissolved, the valve stem 912 and the gap retaining rod 905 spring. Ascending by the force of 908, when the interval holding rod 905 is raised, the inclined guide plate 904 is inclined, when the inclined guide plate 904 is inclined, the interval holding rod 905 is inclined to maintain the interval holding rod 905 disengages from the fusible-link thermosensitive valve, and when the gap retaining rod 905 disengages, the disk 915 is raised to open the fusible-link thermosensitive valve. 901 is a set screw, 902 is a fugitive material, 906 is a frame, 907 is a cap, 922 is a silicone O-ring, 909 is a cover, 910 is a gasket, 911 is an O-ring, 913 is a valve body, 914 is a bag packing, 916 is disk packing, 917 is disk sheet, 918 is fluid inlet, 920 is valve outlet Indicates.

4. The accompanying drawings will be described with reference to FIG. 10 is a system diagram of an emergency shutoff valve shut-off device in a city gas pressure regulator chamber. This means that high pressure, medium pressure and low pressure methods are used to increase the transport capacity and efficient operation of the supply facilities such as piping and gas hold.In the area where gas supply pressure is extremely limited, from high pressure to medium pressure, The pressure regulator 601 is used to reduce the pressure from the medium pressure to the low pressure and to supply the pressure to a suitable pressure suitable for the use mechanism, and the pressure reducing closed emergency shutoff valve 101 is installed at the inlet and the outlet of the pressure regulator 601. will be.

The operation preparation method of this procedure is to fill the air tank 107 by the air compressor 108, and then open the stop valve 106 so that the scale at the pressure gauge 104 can be reduced-pressure closed emergency shutoff valve 101. It is in the operating pressure range of a drive part, and the stop valve 106 is closed. The operation test method sequence is normal when the pressure reducing closed type emergency shutoff valve 101 is closed within two seconds after the emergency valve 105 is opened. In case of fire, when the closed sprinkler head 201 is opened by heat, the compressed air inside the operation tube 102 is released into the atmosphere, and the pressure-reduced closed emergency shutoff valve 101 is automatically closed. By doing so, it is possible to block and extinguish the leakage of gas in case of fire, thereby preventing the spread of fire and protecting human life.

5. The accompanying drawings will be described with reference to FIG. 11 is a schematic diagram of an emergency shutoff valve shut-off device in an LPG charging station. When the LPG of the storage tank 701 is sent to the gas charger 703 by the submersible pump 702, the LPG filling system is to inject the LPG container or the fuel tank of the vehicle from the gas charger 703, and the submersible pump 702. ) Shows that the pressure reducing closed emergency shutoff valve 101 is installed at the outlet. The operation preparation method of this procedure is to fill the air tank 107 by the air compressor 108, and then open the stop valve 106 so that the scale at the pressure gauge 104 can be reduced-pressure closed emergency shutoff valve 101. It is in the operating pressure range of a drive part, and the stop valve 106 is closed.

The operation test method sequence is normal when the pressure reducing closed type emergency shutoff valve 101 is closed within two seconds after the emergency valve 105 is opened. In case of fire, when the closed sprinkler head 201 is opened by heat, the compressed air inside the operation tube 102 is released and the pressure reducing closed emergency shutoff valve 101 is automatically closed. By doing so, when the fire occurs due to the conduction and other causes of the gas charger 703, the amount of leakage gas can be minimized to reduce the damage.

The accompanying drawings will be described with reference to FIG. Fig. 19 is a power cut-off circuit diagram of a contact pressure switch. When a magnetic contactor is normally applied and the closed sprinkler head 201 is opened by heat, or the emergency valve 105 is opened, a contact pressure switch 997 is opened. The main contact point 992 of the magnetic contactor connected to the load side of the parking short circuit 991 by returning the magnetic contactor coil 993 is opened, and the gas compressor circuit breaker 994, the submersible pump circuit breaker 995, and the liquid pump Supply of power to the breaker 996 is interrupted and the fuse 98 is for protecting the control circuit.

In case of LPG filling station, the emergency measures in case of fire open the emergency valve 105 to close the pressure reducing closed emergency shutoff valve 101, cut off the power supply, and close the storage tank and the machine room valve. At this time, it takes 10 to 100 seconds to shut off the power after the emergency valve 105 is opened. For this reason, when the power of the gas compressor, the submersible pump 702 and the liquid transfer pump is automatically shut off in conjunction with the opening of the emergency valve 105 or the opening of the closed sprinkler head, the time required for emergency measures is also saved. It is possible to prevent the shut-off operation of the compressor, the submersible pump 702 and the discharge-side valve of the liquid pump. The power load of the LPG filling station includes a gas compressor, a submersible pump 702, a liquid pump, and an air compressor. Currently, the disconnection of power in the event of a fire at an LPG charging station is achieved by opening the breaker.

6. The accompanying drawings will be described with reference to FIG. 18 is a schematic diagram of a pressure reducing closed emergency shutoff valve with an auto shut-off function having an enhanced malfunction prevention function. This is a mechanical heat sensor in which n thermosensitive valves 801 are connected in series, where n is a natural number except one. In this operation, the decompression closed emergency shutoff valve 101 is closed only when all of the thermosensitive valves 801 connected to the decompression closed emergency shutoff valve 101 are thermally opened. That is, when only one heat-opening valve 801 is opened, the pressure-sensitive closed emergency shutoff valve 101 is not closed and only the two or more pressure-sensitive closed emergency shutoff valves 101 are closed. In addition, the pressure drop inside the control tube 102 is to be small until the heat-opening valve 801 is completely opened using a gas that is a compressive fluid as the working fluid.

① As described in detail above, the present invention relates to a case in which a flame is formed on an upper portion of a pressure reducing closed emergency shutoff valve installed inside a pipe trench in a floor or underground when a fire occurs, and a flame at a position away from the pressure reducing closed emergency shutoff valve. In this case, there is an effect that the auto shut off of the reduced-pressure closed emergency shutoff valve can be made quickly.

② In addition, the pipeline blocking method by the pressure-sensitive closed emergency shutoff valve with auto shutoff function is the only way to prevent damage caused by malfunction. The reason is that the gas leak detector and the automation material detection system have the problem of malfunction and non-operation. There is a problem of malfunction, and mechanical heat detectors such as closed sprinkler heads and electric pots have been recognized by the user for many years that there is no malfunction. The pipeline blocking method by the pressure reducing closed emergency shutoff valve is the only way to prevent damage caused by malfunction. However, I admit that it is not obvious when there is someone presenting a technique for the shut-off method of a pipeline in the event of a fire that has a lower probability of malfunction than this method.

1 is a cross-sectional view of the cylinder operation valve

2 is a schematic diagram of a pressure reducing closed emergency shutoff valve having a shutoff function using a cylinder operation valve as a pressure reducing closed emergency shutoff valve and a closed sprinkler head with a mechanical heat detector.

3 is a schematic diagram of a pressure reducing closed emergency shutoff valve having a shutoff function using a closed sprinkler head.

4 is a schematic diagram of a pressure reducing closed emergency shutoff valve having a shut-off function using available electric power

5 is a schematic diagram of a pressure reducing closed emergency shutoff valve having a shutoff function using an available alloy pipe

Figure 6 is a schematic diagram of the emergency shutoff valve cut-off device using a closed sprinkler head

Figure 7 is a schematic diagram of emergency shutoff valve cut-off device using available electric power

8 is a schematic diagram of an emergency shutoff valve shut-off device using an available alloy pipe

Fig. 9 is a schematic diagram of an emergency shutoff valve cut-off device using hydraulic power and using a closed sprinkler head.

10 is a schematic diagram of an emergency shutoff valve cut-off device in a city gas pressure regulator chamber.

11 is a schematic diagram of an emergency shutoff valve shut-off device in an LPG charging station

12 is a schematic diagram of a pressure reducing closed emergency shutoff valve remote control device

13 is a cross-sectional view of the glass bulb type thermal opening valve

14 is a sectional view of a fusible-link type thermal opening valve

15 is an emergency shutoff valve shut-off system diagram using hydraulic pressure as a power source and a thermosensitive valve;

Fig. 16 is a system diagram of an emergency shutoff valve shut-off device powered by hydraulic pressure and having a return pipe;

17 is a schematic diagram of a pressure reducing closed emergency shutoff valve having a shutoff function using a thermosensitive valve.

18 is a schematic diagram of a pressure reducing closed emergency shutoff valve with an auto shut-off function having an enhanced malfunction prevention function.

19 is a power cutoff circuit diagram of a contact pressure switch;

<Description of the code | symbol about the principal part of drawing>

11: Control tube connection hole 104: Pressure gauge

12: valve inlet 105: emergency valve

13: seat packing 106: stop valve

14: spring 107: air tank

15: Before use 108: Air compressor

16: cylinder 109: union

101: pressure reducing closed emergency shutoff valve 110: branch pipe

102: operator tube 201: closed sprinkler head

103: branch pipe 301: before use

                                401: available alloy pipe

                                501: oil tank

                                502: hydraulic pump

                                503: relief valve

                                801: thermal open valve

                                802: return tube

Claims (5)

A pressure reducing closed emergency shutoff valve 101; An operation tube 102 coupled to the operation tube connection hole of the pressure reducing closed emergency shutoff valve 101; Union 109 coupled to the end of the operation tube 102; A branch pipe (110) branched from the manipulation pipe (102); Pressure reducing closed emergency shutoff valve having a shut-off function characterized in that it comprises a mechanical heat sensor coupled to the branch pipe (110). The pressure reducing closed type emergency shutoff valve according to claim 1, wherein the mechanical heat detector is configured of a closed sprinkler head (201). The pressure reducing closed type emergency shutoff valve according to claim 1, wherein the mechanical heat sensor is constituted by a fusible valve (301). The pressure reducing closed type emergency shutoff valve according to claim 1, wherein the mechanical heat detector is constituted by a fusible alloy pipe (401). The pressure reducing closed type emergency shutoff valve according to claim 1, wherein the mechanical heat sensor is configured of a thermosensitive valve (801).