Low-pressure carbon dioxide fire extinguishing system shunt pipe pre-inflating device and use method thereof

Abstract

The present invention introduces a pre-inflating device for a shunt pipe of a low-pressure carbon dioxide fire extinguishing system and a method of use, including a pre-inflating valve, a base joint, a connecting pipeline, a pre-inflating valve inspection valve and a valve position monitoring device; one end of the pre-inflating valve is arranged on the shunt pipe of the low-pressure carbon dioxide fire extinguishing system through a base joint; the other end is connected to the pre-inflating valve inspection valve through a connecting pipeline; the other end of the pre-inflating valve inspection valve is connected to the gas source pipe of the fire extinguishing agent storage device through a connecting pipeline; the valve position monitoring device is respectively arranged on the pre-inflating valve and the pre-inflating valve inspection valve. The pre-inflating device for a shunt pipe of a low-pressure carbon dioxide fire extinguishing system and a method of use of the present patent can truly and effectively reflect the performance of each partition selection valve under actual working conditions; the pressure difference between the inlet and outlet of the main inspection valve is small, and the external force required to open the valve is small, which is also conducive to improving the life and performance of the main inspection valve.

Description

Technical Field

[0001] The present invention relates to the technical field of fire-fighting gas fire extinguishing, and in particular to a pre-inflating device for a shunt pipe of a low-pressure carbon dioxide fire extinguishing system and a use method thereof. Background Art

[0002] Low-pressure carbon dioxide fire extinguishing systems are widely used in industrial projects such as coating lines, cement production lines, the steel and nonferrous metals industries, and power plants. In a typical low-pressure carbon dioxide fire extinguishing system, carbon dioxide is stored in a liquid form in a fire extinguishing agent storage device. A main inspection valve is installed at the outlet of the fire extinguishing agent storage device to block the outflow of carbon dioxide from the fire extinguishing agent storage device when the system is shut down for maintenance. The main inspection valve connects to the diversion pipes of different fire extinguishing areas. The diversion pipes are equipped with pressure gauges, safety valves, and manual pressure relief valves to ensure the safe operation of the system. Fire extinguishing zone selection valves are also installed on the branches of each fire extinguishing zone on the diversion pipes. When a fire occurs in a fire extinguishing zone, the main inspection valve is opened, and the fire extinguishing zone selection valve is opened under the control of the automatic fire alarm system. The carbon dioxide is then released into the fire extinguishing zone through the fire extinguishing zone selection valve and the fire extinguishing agent pipeline to extinguish the fire. When the main inspection valve is opened, pressure (approximately 2.07 MPa) is present on the fire extinguishing agent storage device side (inlet) of the main inspection valve, while there is no pressure (0 MPa) on the main inspection valve's diverter pipe side (outlet). This creates a pressure difference between the inlet and outlet of the main inspection valve. This pressure difference requires a greater force to open the main inspection valve, potentially damaging the valve core and potentially affecting the valve's lifespan and performance.

[0003] In order to ensure that the low-pressure carbon dioxide fire extinguishing system can operate safely, reliably and effectively after it is put into use, the above-mentioned valves must be repeatedly subjected to action simulation tests according to their actual working conditions during the commissioning phase of the low-pressure carbon dioxide fire extinguishing system; in order to ensure that the above-mentioned valves are always in a reliable and effective state during the operation of the low-pressure carbon dioxide fire extinguishing system, it is also necessary to regularly conduct action simulation tests on the above-mentioned valves according to their actual working conditions.

[0004] In a typical low-pressure CO2 fire extinguishing system, when conducting a simulated test of the zone selector valve's operation, the main inspection valve is closed. Therefore, there is no pressure (0 MPa) in the pipe between the zone selector valve and the main inspection valve. At this time, the simulated test environment for the zone selector valve's operation does not match actual operating conditions (under actual operating conditions, there is a pressure of approximately 2.07 MPa in the pipe between the zone selector valve and the main inspection valve). Therefore, the simulated test of the zone selector valve's operation cannot truly and effectively reflect the zone selector valve's performance under actual operating conditions. Summary of the Invention

[0005] In order to overcome the deficiencies in the background technology, the technical problem to be solved by the present invention is to provide a pre-inflating device for the diversion pipe of a low-pressure carbon dioxide fire extinguishing system and a method of use thereof, which facilitates the opening of the main inspection valve, is beneficial to improving the life and performance of the main inspection valve, and can truly and effectively reflect the performance of each zone selection valve under actual working conditions.

[0006] The technical solution adopted by the present invention to solve the technical problem is:

[0007] A pre-charging device for the manifold of a low-pressure carbon dioxide fire extinguishing system, including a pre-charging valve, a base connector, connecting pipes, a pre-charging valve inspection valve, and a valve position monitoring device;

[0008] One end of the pre-inflation valve is arranged on the diversion pipe of the low-pressure carbon dioxide fire extinguishing system through a base joint; the other end is connected to the pre-inflation valve inspection valve through a connecting pipeline; the other end of the pre-inflation valve inspection valve is connected to the gas phase gas source pipe of the fire extinguishing agent storage device through a connecting pipeline; the valve position monitoring device is respectively arranged on the pre-inflation valve and the pre-inflation valve inspection valve, and the valve position monitoring device sends the "open" or "closed" status information of the pre-inflation valve and the pre-inflation valve inspection valve to the carbon dioxide fire extinguishing system device control cabinet.

[0009] Specifically, the base joint is welded and arranged on the diversion pipe of the low-pressure carbon dioxide fire extinguishing system.

[0010] Specifically, the pre-inflated valve and the base joint are sealed by a tapered pipe thread.

[0011] Specifically, a valve is provided on the connecting pipeline connecting the pre-inflation valve inspection valve and the gas source pipe of the fire extinguishing agent storage device.

[0012] More specifically, the valve is in a normally open state.

[0013] Specifically, the specifications of the pre-inflation valve inspection valve should be greater than or equal to the specifications of the pre-inflation valve.

[0014] Specifically, the normal state of the pre-inflation valve is "closed", and the abnormal state is "open". When the valve position monitoring device sends the abnormal state of the pre-inflation valve to the carbon dioxide fire extinguishing system control cabinet, the low-pressure carbon dioxide fire extinguishing system control cabinet performs an alarm action.

[0015] Specifically, the normal state of the pre-inflation valve inspection valve is "open", and the abnormal state is "closed". When the valve position monitoring device sends the abnormal state of the pre-inflation valve inspection valve to the carbon dioxide fire extinguishing system control cabinet, the low-pressure carbon dioxide fire extinguishing system control cabinet will perform an alarm action.

[0016] The method for using the pre-inflating device for the shunt pipe of the low-pressure carbon dioxide fire extinguishing system specifically comprises the following steps:

[0017] When conducting simulation experiments on the action of each zone selection valve:

[0018] S1: First, ensure that the main inspection valve is in the closed state. At this time, the carbon dioxide in the fire extinguishing agent storage device cannot enter the diversion pipe. There is no carbon dioxide gas in the diversion pipe, and the pressure in the diversion pipe is 0 MPa. Turn the handle of the pre-inflation valve to open the pre-inflation valve. The carbon dioxide gas flows out of the fire extinguishing agent storage device, flows through the pre-inflation valve inspection valve, and then enters the diversion pipe through the pre-inflation valve, starting to inflate the diversion pipe.

[0019] S2: Observe the pressure gauge. If the pressure gauge reading gradually rises, it indicates that the shunt pipe inflation process is normal. If the pressure gauge reading remains unchanged, it indicates that there is an abnormality in the shunt pipe inflation process. In this case, close the pre-inflation valve and find out the cause. After the cause is found and dealt with, open the pre-inflation valve again to inflate the shunt pipe until the pressure gauge reading rises and stops changing. This indicates that the shunt pipe inflation is complete. At this point, the shunt pipe and the branch pipes of the shunt pipe are filled with carbon dioxide gas, and the carbon dioxide gas pressure is equal to the pressure in the fire extinguishing agent storage device. Each zone selection valve is in an action simulation test environment that is the same as its actual working condition.

[0020] S3: After completing step 2, close the pre-inflation valve first, and then open the partition selection valve. The simulation test of the partition selection valve action is completed once;

[0021] S4: After closing the partition selection valve, repeat the above steps to perform the partition selection valve action simulation test multiple times. After all the partition selection valve action simulation tests are completed, close the pre-inflation valve to end the partition selection valve action simulation test.

[0022] Open the main inspection valve:

[0023] S1: Before opening the main inspection valve, first check the system status and the status of instruments and equipment such as the pressure gauge, safety valve, manual pressure relief valve, and zone selection valve. When the system and instrument equipment are in normal condition, proceed to the next step;

[0024] S2: Turn the handle of the pre-inflation valve to open it. The carbon dioxide gas flows out of the fire extinguishing agent storage device, flows through the pre-inflation valve inspection valve, and then enters the diversion pipe through the pre-inflation valve. At this time, the diversion pipe begins to be inflated.

[0025] S3: Observe the pressure gauge. If the pressure gauge reading gradually rises, it indicates that the shunt tube inflation process is normal. If the pressure gauge reading remains unchanged, it indicates that there is an abnormality in the shunt tube inflation process. In this case, close the pre-inflation valve and find out the cause. After the cause is found and dealt with, open the pre-inflation valve again to inflate the shunt tube until the pressure gauge reading rises and stops changing, indicating that the shunt tube inflation is complete.

[0026] S4: After inflation, the diversion pipe and the branch pipes of the diversion pipe are filled with carbon dioxide gas, and the pressure of the carbon dioxide gas is equal to the pressure in the fire extinguishing agent storage device. There is pressure on both sides of the inlet and outlet of the main inspection valve and the pressure is equal, and there is no pressure difference; first close the pre-inflation valve, and then the main inspection valve can be easily opened.

[0027] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0028] 1. The patented low-pressure carbon dioxide fire extinguishing system manifold pre-inflation device and its method of use can conduct action simulation tests under the same environmental conditions as the actual working conditions of the zone selection valve. The test operation is safe and controllable, and the test results are true and reliable. It can truly and effectively reflect the performance of each zone selection valve under actual working conditions.

[0029] 2. Before opening the main inspection valve, the pre-inflation valve can be used to inflate the low-pressure carbon dioxide fire extinguishing system diversion pipe until its internal pressure is equal to the internal pressure of the fire extinguishing agent storage device. At this time, since there is no pressure difference on both sides of the inlet and outlet of the main inspection valve, the main inspection valve can be smoothly opened with a smaller operating force; at the same time, the pressure difference on both sides of the inlet and outlet of the main inspection valve is small, and the external force required to open the valve is small, which is also beneficial to improve the life and performance of the main inspection valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the connection between this patent and a low-pressure carbon dioxide fire extinguishing system.

[0031] In the figure: 1-pre-inflation valve, 2-fire extinguishing agent storage device, 3-valve position monitoring device, 4-pre-inflation valve inspection valve, 5-main inspection valve, 6-diverter pipe, 7-pressure gauge, 8-safety valve, 9-manual pressure relief valve, 10-diverter pipe partition branch pipe, 11-partition selection valve, 12-charging pipe, 13-balancing pipe, 14-overpressure exhaust pipe, 15-gas source pipe of fire extinguishing agent storage device. DETAILED DESCRIPTION

[0032] The present invention will be further explained below with reference to the accompanying drawings and embodiments, which should not be used to limit the scope of protection of the present invention. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0033] Combined with attachment Figure 1 A pre-inflating device for a shunt pipe of a low-pressure carbon dioxide fire extinguishing system comprises a pre-inflating valve 1, a base joint, a connecting pipeline, a pre-inflating valve inspection valve 4 and a valve position monitoring device 3.

[0034] The base joint is welded and installed on the diversion pipe 6 of the low-pressure carbon dioxide fire extinguishing system. The pre-inflation valve 1 and the base joint are sealed with a tapered pipe thread. One end of the pre-inflation valve 1 is set on the diversion pipe 6 of the low-pressure carbon dioxide fire extinguishing system through the base joint, and the other end of the pre-inflation valve 1 is connected to one end of the pre-inflation valve inspection valve 4 through a connecting pipeline; the other end of the pre-inflation valve inspection valve 4 is connected to the gas phase gas source pipe 15 of the fire extinguishing agent storage device through a connecting pipeline, and a valve is provided on the connecting pipeline connecting the pre-inflation valve inspection valve 4 and the gas phase gas source pipe 15 of the fire extinguishing agent storage device, and the valve is in a normally open state during use; the specifications of the pre-inflation valve inspection valve 4 are larger than those of the pre-inflation valve 1.

[0035] The valve position monitoring device 3 is respectively arranged on the pre-inflation valve 1 and the pre-inflation valve inspection valve 4, and the valve position monitoring device 3 sends the "open" or "closed" status information of the pre-inflation valve 1 and the pre-inflation valve inspection valve 4 to the carbon dioxide fire extinguishing system device control cabinet.

[0036] After the low-pressure carbon dioxide fire extinguishing system is put into use, the normal state of the pre-inflation valve 1 is "closed", and the abnormal state is "open". When the valve position monitoring device 3 sends the abnormal state of the pre-inflation valve 1 to the carbon dioxide fire extinguishing system device control cabinet, the low-pressure carbon dioxide fire extinguishing system device control cabinet will perform an alarm action.

[0037] The normal state of the pre-inflating valve inspection valve 4 is "open", and the abnormal state is "closed". When the valve position monitoring device 3 sends the abnormal state of the pre-inflating valve inspection valve 4 to the carbon dioxide fire extinguishing system device control cabinet, the low-pressure carbon dioxide fire extinguishing system device control cabinet performs an alarm action.

[0038] Preferably, the pre-inflation valve 1 is a two-position two-way manual ball valve; the pre-inflation valve inspection valve 4 is a two-position three-way manual ball valve. When the pre-inflation valve inspection valve 4 is "closed", the connecting pipeline between the gas source pipe 15 of the fire extinguishing agent storage device and the pre-inflation valve 1 is not connected. The pre-inflation valve inspection valve 4 is a two-position three-way manual ball valve, which can automatically discharge the gas in the connecting pipeline between the pre-inflation valve inspection valve 4 and the pre-inflation valve 1, thereby ensuring the safety of the maintenance work of the pre-inflation valve 1.

[0039] Preferably, the connecting pipeline between the pre-inflation valve 1 and the pre-inflation valve inspection valve 4 adopts a copper tube or a galvanized seamless steel tube for conveying fluid; when a copper tube is selected, both ends of the copper tube are connected to the pre-inflation valve 1 and the pre-inflation valve inspection valve 4 with conversion joints; the copper tube is inserted into the casing for protection, and the casing is firmly fixed with a pipe clamp; when a galvanized seamless steel tube is selected for conveying fluid, both ends of the galvanized seamless steel tube for conveying fluid need to be connected to the pre-inflation valve 1 and the pre-inflation valve inspection valve 4 respectively with metal hoses, and firmly fixed with pipe clamps.

[0040] The pressure gauge 7, safety valve 8, and manual pressure relief valve 9 of the low-pressure carbon dioxide fire extinguishing system of this patent are arranged on the diversion pipe 6, and the safety valve 8 and the manual pressure relief valve 9 are both connected to the overpressure exhaust pipe 14 on the gas source pipe 15 of the fire extinguishing agent storage device; the fire extinguishing agent storage device 2 is filled with fire extinguishing agent through the filling pipe 12, and the pressure balance in the fire extinguishing agent storage device 2 is adjusted through the balance pipe 13.

[0041] During the use of the fire extinguishing system, the pre-inflation valve 1 is in a normally closed state, and the pre-inflation valve inspection valve 4 is in a normally open state; when the pre-inflation valve 1 is used to simulate the action of the partition selection valve 11 in the laboratory or for pre-inflation to facilitate the opening of the storage device main inspection valve 5, the pre-inflation valve 1 is in an open state; when the pre-inflation valve 1 has a problem and needs to be repaired, the pre-inflation valve inspection valve 4 needs to be closed.

[0042] The method of using the pre-inflating device for the manifold of the low-pressure carbon dioxide fire extinguishing system is as follows: When conducting the simulation experiment of the action of the selector valve 11 of each zone:

[0043] S1: First, ensure that the main inspection valve 5 is in the closed state. At this time, the carbon dioxide in the fire extinguishing agent storage device 2 cannot enter the diversion pipe 6. There is no carbon dioxide gas in the diversion pipe 6, and the pressure in the diversion pipe 6 is 0 MPa. Turn the handle of the pre-inflation valve 1 to open the pre-inflation valve 1. The carbon dioxide gas flows out of the fire extinguishing agent storage device 2, flows through the pre-inflation valve inspection valve 4, and then enters the diversion pipe 6 through the pre-inflation valve 1, starting to inflate the diversion pipe 6.

[0044] S2: Observe the pressure gauge 7. If the reading of the pressure gauge 7 gradually rises, it indicates that the inflation process of the shunt pipe 6 is normal. If the reading of the pressure gauge 7 remains unchanged, it indicates that there is an abnormality in the inflation process of the shunt pipe 6. In this case, close the pre-inflation valve 1 and find out the cause. After the cause is found and dealt with, open the pre-inflation valve 1 again to inflate the shunt pipe 6 until the reading of the pressure gauge 7 rises and stops changing. This indicates that the inflation of the shunt pipe 6 is complete. At this time, the shunt pipe 6 and the shunt pipe branch pipes 10 are filled with carbon dioxide gas, and the pressure of the carbon dioxide gas is equal to the pressure in the fire extinguishing agent storage device 2. Each zone selection valve 11 is in an action simulation test environment that is the same as its actual working condition.

[0045] S3: After completing step 2, first close the pre-inflation valve 1, and then open the partition selection valve 11. The simulation test of the operation of the partition selection valve 11 is completed.

[0046] S4: After closing the partition selection valve 11, repeat the above steps to perform the partition selection valve 11 action simulation test multiple times. After all the partition selection valve 11 action simulation tests are completed, close the pre-inflation valve 1 to end the partition selection valve 11 action simulation test;

[0047] Open the main inspection valve:

[0048] S1: Before opening the main inspection valve 5, first check the system status and the status of instruments and equipment such as the pressure gauge 7, safety valve 8, manual pressure relief valve 9, and zone selection valve 11. When the system and instrument equipment are in normal condition, proceed to the next step;

[0049] S2: Turn the handle of the pre-inflation valve 1 to open it. The carbon dioxide gas flows out of the fire extinguishing agent storage device 2, flows through the pre-inflation valve inspection valve 4, and then enters the shunt pipe 6 through the pre-inflation valve 1. At this time, the shunt pipe 6 begins to be inflated.

[0050] S3: Observe the pressure gauge 7. If the reading of the pressure gauge 7 gradually rises, it indicates that the inflation process of the shunt tube 6 is normal. If the reading of the pressure gauge 7 does not change, it indicates that there is an abnormality in the inflation process of the shunt tube 6. Then close the pre-inflation valve 1 and find out the cause. After the cause is found and dealt with, open the pre-inflation valve 1 again to inflate the shunt tube 6 until the reading of the pressure gauge 7 rises and stops changing. This indicates that the inflation of the shunt tube 6 is completed.

[0051] S4: At this time, the diversion pipe 6 and the diversion pipe branch pipe 10 are filled with carbon dioxide gas, and the pressure of the carbon dioxide gas is equal to the pressure in the fire extinguishing agent storage device 2. There is pressure on both the inlet and outlet sides of the main inspection valve 5 and the pressure is equal, and there is no pressure difference; first close the pre-inflation valve 1, and then the main inspection valve 5 can be easily opened.

[0052] The parts not described in detail in this invention are prior art.

[0053] The embodiments selected herein for the purpose of disclosing the invention are presently considered suitable, but it should be understood that the invention is intended to include all variations and modifications of the embodiments that fall within the scope of the concept and invention.

Claims

1. A method for using a pre-inflating device for a shunt pipe of a low-pressure carbon dioxide fire extinguishing system, characterized in that: The specific steps include: When conducting simulation experiments on the action of each zone selection valve: S1: First, make sure that the main inspection valve is in the closed state. At this time, the carbon dioxide in the fire extinguishing agent storage device cannot enter the diversion pipe, there is no carbon dioxide gas in the diversion pipe, and the pressure in the diversion pipe is 0Mpa; turn the handle of the pre-inflation valve to open the pre-inflation valve, and the carbon dioxide gas flows out of the fire extinguishing agent storage device, flows through the pre-inflation valve inspection valve, and then enters the diversion pipe through the pre-inflation valve, and starts to inflate the diversion pipe; S2: Observe the pressure gauge. If the indication of the pressure gauge gradually rises, it means that the charging process of the shunt pipe is normal. If the indication of the pressure gauge remains unchanged, it means that there is an abnormality in the charging process of the shunt pipe. The pre-charging valve should be closed to find out the cause. After the cause is found and dealt with, the pre-charging valve should be opened again to inflate the shunt pipe until the indication of the pressure gauge rises to the point where the indication of the pressure gauge no longer changes, indicating that the charging of the shunt pipe is completed. At this time, the shunt pipe and the shunt pipe branch pipes are filled with carbon dioxide gas, and the pressure of the carbon dioxide gas is equal to the pressure in the fire extinguishing agent storage device. Each partition selection valve is in an action simulation test environment that is the same as its actual working condition. S3: After completing step 2, close the pre-inflation valve first, and then open the partition selection valve. The simulation test of the partition selection valve action is completed; S4: After closing the partition selection valve, repeat the above operation steps, and the partition selection valve action simulation test can be performed multiple times; after all the partition selection valve action simulation tests are completed, close the pre-inflation valve to end the partition selection valve action simulation test; Open the main inspection valve: S1: Before opening the main inspection valve, first check the system status and the status of instruments and equipment such as the pressure gauge, safety valve, manual pressure relief valve, and zone selection valve. When the system and instrument equipment are in normal condition, proceed to the next step; S2: Turn the handle of the pre-inflating valve to open the pre-inflating valve, and the carbon dioxide gas flows out from the fire extinguishing agent storage device, flows through the pre-inflating valve inspection valve, and then enters the shunt pipe through the pre-inflating valve. At this time, the shunt pipe starts to be inflated; S3: Observe the pressure gauge. If the pressure gauge reading gradually rises, it means that the shunt tube inflation process is normal. If the pressure gauge reading remains unchanged, it means that there is an abnormality in the shunt tube inflation process. In this case, the pre-inflation valve should be closed to find out the cause. After the cause is found and dealt with, the pre-inflation valve should be opened again to inflate the shunt tube until the pressure gauge reading rises and stops changing, indicating that the shunt tube inflation is complete. S4: After inflation, the shunt pipe and the branch pipes are filled with carbon dioxide gas, and the pressure of the carbon dioxide gas is equal to the pressure in the fire extinguishing agent storage device. There is pressure on both sides of the inlet and outlet of the main inspection valve, and the pressure is equal, and there is no pressure difference; first close the pre-inflation valve, and then the main inspection valve can be easily opened; The low-pressure carbon dioxide fire extinguishing system shunt pipe pre-inflating device comprises a pre-inflating valve, a base joint, a connecting pipeline, a pre-inflating valve inspection valve and a valve position monitoring device; One end of the pre-inflation valve is arranged on the shunt pipe of the low-pressure carbon dioxide fire extinguishing system through a base joint, and the other end is connected to one end of the pre-inflation valve inspection valve through a connecting pipeline; the other end of the pre-inflation valve inspection valve is connected to the gas phase gas source pipe of the fire extinguishing agent storage device through a connecting pipeline; the valve position monitoring device is respectively arranged on the pre-inflation valve and the pre-inflation valve inspection valve, and the valve position monitoring device sends the status information of the pre-inflation valve and the pre-inflation valve inspection valve to the carbon dioxide fire extinguishing system device control cabinet respectively.

2. The method for using the low-pressure carbon dioxide fire extinguishing system shunt pipe pre-inflating device according to claim 1, characterized in that: The base joint is welded and arranged on the shunt pipe of the low-pressure carbon dioxide fire extinguishing system.

3. The method for using the low-pressure carbon dioxide fire extinguishing system shunt pipe pre-inflating device according to claim 1, characterized in that: The pre-inflated valve and the base joint are sealed and connected by a conical pipe thread.

4. The method for using the low-pressure carbon dioxide fire extinguishing system shunt pipe pre-inflating device according to claim 1, characterized in that: A valve is arranged on the connecting pipeline connecting the pre-inflated valve inspection valve and the gas source pipe of the fire extinguishing agent storage device.

5. The method for using the low-pressure carbon dioxide fire extinguishing system shunt pipe pre-inflating device according to claim 4, characterized in that: The valve is in a normally open state.

6. The method for using the low-pressure carbon dioxide fire extinguishing system shunt pipe pre-inflating device according to claim 1, characterized in that: The specifications of the pre-inflation valve inspection valve are not less than those of the pre-inflation valve.

7. The method for using the low-pressure carbon dioxide fire extinguishing system manifold pre-inflating device according to claim 1, characterized in that: The normal state of the pre-inflation valve is "closed", and the abnormal state is "open". When the valve position monitoring device sends the abnormal state of the pre-inflation valve to the carbon dioxide fire extinguishing system control cabinet, the low-pressure carbon dioxide fire extinguishing system control cabinet performs an alarm action.

8. The method for using the low-pressure carbon dioxide fire extinguishing system shunt pipe pre-inflating device according to claim 1, characterized in that: The normal state of the pre-inflating valve inspection valve is "open", and the abnormal state is "closed". When the valve position monitoring device sends the abnormal state of the pre-inflating valve inspection valve to the carbon dioxide fire extinguishing system control cabinet, the low-pressure carbon dioxide fire extinguishing system control cabinet performs an alarm action.

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