Leakage prevention method for gas pipeline

Abstract

The embodiment of the invention discloses an anti-leakage method for a gas pipeline, and the method comprises the steps: obtaining the throughput of a total gas valve of a building and the throughput of each home-entry gas valve through a system within detection time, and respectively generating a total gas throughput value and a gas sum value; and the system carries out difference value calculation on the total gas passing value and the gas sum value to obtain a gas difference value. And the gas difference value is compared with a preset gas amount threshold value, and whether abnormal leakage exists or not is judged. And if the gas difference value exceeds the gas amount threshold value, the system generates a gas leakage signal. After the signal is triggered, the system closes a total gas valve of the building and sends alarm information to the outside (such as a manager or a gas company) through a communication means. According to the method, the use condition of the gas pipeline can be monitored in real time, leakage is quickly found through difference calculation, and the detection efficiency is greatly improved. Compared with a traditional mode depending on subjective discovery of a user, the method has higher sensitivity and reliability. When leakage is detected, the system can automatically close the gas main valve.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas pipelines, in particular to a gas pipeline leakage prevention method. BACKGROUND

[0002] Gas pipeline leakage is a very dangerous situation, which can cause fire, explosion, poisoning and other serious consequences.

[0003] Urban buried gas pipelines, especially steel pipelines, are prone to micro-pore leakage due to corrosion, and the leaked gas will overflow and diffuse from the surrounding soil gaps. When the leaked gas encounters a hole such as a sewage well, a gas well, or a cable trench, it will accumulate, and when the concentration of the accumulated gas reaches the explosion limit, it will cause a fire or explosion when encountering a spark.

[0004] A Chinese patent discloses a patent number CN 110645481 A, which is a gas pipeline leakage control method. The gas detection device tests the gas concentration at the detection points, then compares the gas concentration at each detection point on each detection surface, obtains the maximum gas concentration, and compares the gas concentration of each detection surface with the maximum value to control gas leakage.

[0005] However, another gas pipeline is arranged on the outer wall of the building, and part of it is located outside the building and part of it is arranged inside the building. If there is a leak in the gas pipeline outside the building, the leaked gas will be directly released into the air and will not be known at the first time. Since the gas pipeline is arranged on the outer wall, it is difficult to detect, so the existing method is not to detect, or to wait for a period of time after the leakage is found by the user to process the gas leakage.

[0006] The gas pipeline leakage cannot be known at the first time, and the leakage prevention treatment cannot be performed, which easily causes gas accidents. SUMMARY

[0007] Therefore, it is necessary to propose a gas pipeline leakage prevention method to solve the above problems.

[0008] The present application provides a gas pipeline leakage prevention method, which comprises:

[0009] Obtaining the total gas flow of the total gas valve of the target building within the detection time to generate a total gas flow value;

[0010] Obtaining the sum of the gas flow of each household gas valve of the target building within the detection time to obtain a total gas sum value;

[0011] Calculating the difference between the total gas flow value and the total gas sum value to obtain a gas difference value;

[0012] comparing the gas difference value with a gas amount threshold value, if the gas difference value is greater than the gas amount threshold value, generating a gas leakage signal, and executing the gas leakage signal to control the total gas valve to close, and sending the gas leakage signal to the outside.

[0013] In at least one embodiment of the present application, the method further comprises:

[0014] if the gas difference value is less than the gas amount threshold value, performing gas leakage detection in the next cycle.

[0015] In at least one embodiment of the present application, the method further comprises:

[0016] obtaining the gas concentration in each gas valve in the target building, and generating real-time gas concentration data;

[0017] selecting a maximum gas concentration value and a minimum gas concentration value from the real-time gas concentration data;

[0018] calculating the difference between the maximum gas concentration value and the minimum gas concentration value to obtain a gas concentration difference value;

[0019] comparing the gas concentration difference value with a gas concentration threshold value, if the gas concentration difference value is greater than the gas concentration threshold value, generating a pipeline damage signal, and sending the pipeline damage signal to the outside.

[0020] In at least one embodiment of the present application, the method further comprises:

[0021] if the gas concentration difference value is less than the gas concentration threshold value, performing gas leakage detection in the next cycle.

[0022] In at least one embodiment of the present application, the method further comprises:

[0023] marking the valve corresponding to the minimum gas concentration value as a target valve;

[0024] obtaining the gas concentration value of the branch valve where the target valve is located to obtain an adjacent gas concentration value;

[0025] calculating the difference between the adjacent gas concentration value and the minimum gas concentration value to obtain an adjacent gas concentration difference value;

[0026] comparing the adjacent gas concentration difference value with the gas concentration threshold value, if the adjacent gas concentration difference value is greater than the gas concentration threshold value, generating a target pipeline damage signal;

[0027] and generating a branch valve closing signal according to the target pipeline damage signal, and executing the branch valve closing signal to close the branch valve.

[0028] In at least one embodiment of the present application, the method further comprises:

[0029] If the adjacent gas concentration difference value is less than the gas concentration threshold value, gas leakage detection in the next cycle is performed.

[0030] In at least one embodiment of the present application, the branch valve is arranged between the target valve and the total gas valve, and each branch valve controls one or more household gas valves.

[0031] In at least one embodiment of the present application, the target pipeline damage signal includes the floor where the branch valve is located, the position information of the target valve, and the corresponding room information.

[0032] In at least one embodiment of the present application, the step of calculating the difference between the adjacent gas concentration value and the minimum gas concentration value to obtain the adjacent gas concentration difference value comprises:

[0033] Obtaining the temperature value of the branch valve to generate a first temperature value;

[0034] Obtaining the temperature value of the target valve to generate a second temperature value;

[0035] Calculating the temperature difference value according to the first temperature value and the second temperature value, and calculating the gas concentration compensation value according to the temperature difference value;

[0036] Summing the minimum gas concentration value and the gas concentration compensation value to obtain a summed gas concentration value;

[0037] Comparing the summed gas concentration value with the gas concentration threshold value.

[0038] In at least one embodiment of the present application, the method further comprises:

[0039] Obtaining the gas concentration value of the environment where the target valve is located to generate an environmental gas concentration value;

[0040] Comparing the environmental gas concentration value with the environmental gas concentration threshold value, and if the environmental gas concentration value is greater than the environmental gas concentration threshold value, generating a target valve gas leakage signal.

[0041] The gas pipeline leakage prevention method implemented in the embodiment has at least the following beneficial effects:

[0042] The gas pipeline leakage prevention method provided above, in the detection time, the system obtains the passing amount of the building total gas valve and the passing amount of each household gas valve, and generates a total gas passing value and a gas sum value, respectively.

[0043] The system calculates the total gas difference value by subtracting the total gas sum value from the total gas passing value.

[0044] The gas difference value is compared with a preset gas amount threshold value to determine whether there is an abnormal leakage.

[0045] If the gas difference value exceeds the gas amount threshold value, the system generates a gas leakage signal.

[0046] After the signal is triggered, the system closes the building total gas valve and sends an alarm message to the outside (such as the management personnel or the gas company) through communication means.

[0047] This method can monitor the use of gas pipelines in real time, quickly find leaks through difference calculation, and greatly improve detection efficiency.

[0048] Compared with the traditional method of relying on user subjective discovery, this method has higher sensitivity and reliability.

[0049] At the same time when the leakage is detected, the system can automatically close the total gas valve and notify the outside, reducing the time cost and potential risk of human intervention.

[0050] Effectively control the scope of the accident, reduce the probability of secondary disasters such as fire and explosion.

[0051] Precise monitoring of gas pipelines helps to quickly detect trace leaks and avoid gas waste; at the same time, through automatic linkage, potential safety hazards are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0053] Among them:

[0054] Figure 1 The flowchart of the gas pipeline leakage prevention method in Example One;

[0055] Figure 2 The flowchart of the gas pipeline leakage prevention method in Example Two;

[0056] Figure 3 The flowchart of the gas pipeline leakage prevention method in Example Three;

[0057] Figure 4 The flowchart of the gas pipeline leakage prevention method in Example Four. DETAILED DESCRIPTION

[0058] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0059] The present application provides a gas pipeline leakage prevention method, the method comprising:

[0060] S101, obtaining the total gas valve of the target building in the detection time The gas flow rate is generated to generate a total gas flow value;

[0061] S102, obtaining the sum of the gas flow rate of each household gas valve of the target building in the detection time, obtaining a total gas sum value;

[0062] S103, the total gas flow value and the total gas sum value are calculated by difference, and a gas difference value is obtained;

[0063] S104, comparing the gas difference value with the gas amount threshold value;

[0064] S105, if the gas difference value is greater than the gas amount threshold value, a gas leakage signal is generated, and the gas leakage signal is executed to control the total gas valve to be closed, and the gas leakage signal is sent to the outside.

[0065] Embodiment one:

[0066] Please refer to the attached Figure 1 In this embodiment, the system obtains the flow rate of the total gas valve of the building and the flow rate of each household gas valve in the detection time, and generates a total gas flow value and a total gas sum value respectively.

[0067] The system calculates the total gas flow value and the total gas sum value by difference, and obtains a gas difference value.

[0068] The gas difference value is compared with the preset gas amount threshold value to determine whether there is abnormal leakage.

[0069] If the gas difference value exceeds the gas amount threshold value, the system generates a gas leakage signal.

[0070] After the signal is triggered, the system closes the total gas valve of the building, and sends an alarm information to the outside (such as the management personnel or the gas company) through the communication means.

[0071] The method can monitor the use of the gas pipeline in real time, quickly find the leakage through difference calculation, and greatly improve the detection efficiency.

[0072] Compared with the traditional method relying on subjective discovery of users, the method has higher sensitivity and reliability.

[0073] While the leakage is detected, the system can automatically close the total gas valve and notify the outside, reducing the time cost and potential risk of human intervention.

[0074] Effectively control the scope of the accident, and reduce the probability of secondary disasters such as fire and explosion.

[0075] Precise monitoring of gas pipelines helps to detect trace leaks in time and avoid gas waste; at the same time, through automatic linkage, potential safety hazards are reduced.

[0076] It should be noted that the total gas passing value is the total amount of gas passing through the total gas valve within the detection time.

[0077] The gas passing amount of each user's indoor gas valve in the target building is detected one by one, and the passing amounts of all users are accumulated to generate a total gas value.

[0078] Refine the gas usage data of each user to further accurately locate the gas usage distribution in the building.

[0079] In at least one embodiment of the present application, the method further comprises:

[0080] S106, if the gas difference value is less than the gas amount threshold, proceed with gas leakage detection in the next cycle.

[0081] If the gas difference value does not exceed the gas amount threshold, the system enters the next detection cycle and continues to monitor the gas condition of the building.

[0082] In at least one embodiment of the present application, the method further comprises:

[0083] S201, obtaining the gas concentration in each gas valve of the target building to generate real-time gas concentration data;

[0084] S202, selecting the maximum gas concentration value and the minimum gas concentration value from the real-time gas concentration data;

[0085] S203, calculating the difference between the maximum gas concentration value and the minimum gas concentration value to obtain a gas concentration difference value;

[0086] S204, comparing the gas concentration difference value with a gas concentration threshold value,

[0087] S205, if the gas concentration difference value is greater than the gas concentration threshold value, a pipeline damage signal is generated and sent to the outside.

[0088] In at least one embodiment of the present application, the method further comprises:

[0089] S206, if the gas concentration difference value is less than the gas concentration threshold value, proceed to the next cycle of gas leakage detection.

[0090] Embodiment two:

[0091] Please refer to the attached Figure 2 In this embodiment, the system obtains real-time gas concentration data of each gas valve through sensors installed on the target building gas valves.

[0092] The system extracts the maximum and minimum values in the real-time concentration data and calculates the concentration difference value as the basis for judging pipeline leakage or damage.

[0093] The system compares the calculated gas concentration difference value with the preset gas concentration threshold value to determine whether it is within the range of the gas concentration threshold value.

[0094] If the gas concentration difference value exceeds the gas threshold value, the system generates a pipeline damage signal and sends the signal to an external management system or gas company for emergency measures.

[0095] If the gas concentration difference value does not exceed the gas threshold value, the system enters the next monitoring cycle and continues to detect and analyze the gas concentration.

[0096] This method can quickly find local abnormal concentration areas by obtaining real-time gas concentration data, thereby achieving accurate positioning of gas leakage.

[0097] The difference analysis of the maximum and minimum values enables the system to identify local leakage points and concentration abnormal points, improving the sensitivity and accuracy of detection.

[0098] By automatically generating a pipeline damage signal and sending it to an external system, the whole process of leakage detection is automated, reducing human intervention and improving accident handling efficiency.

[0099] Through dynamic monitoring of the concentration difference value and alarm linkage, secondary disasters such as fire and explosion caused by gas accumulation or leakage are prevented, greatly improving the safety of the gas use environment.

[0100] In at least one embodiment of the present application, the method further comprises:

[0101] S301, mark the valve corresponding to the minimum gas concentration value as the target valve;

[0102] S302, obtain the gas concentration value of the branch valve where the target valve is located to obtain the adjacent gas concentration value;

[0103] The adjacent gas concentration value is subtracted from the minimum gas concentration value to obtain an adjacent gas concentration difference value;

[0104] The adjacent gas concentration difference value is compared with the gas concentration threshold value;

[0105] S305If the adjacent gas concentration difference value is greater than the gas concentration threshold value, a target pipeline breakage signal is generated, and a branch valve closing signal is generated according to the target pipeline breakage signal, and the branch valve closing signal is executed to close the branch valve.

[0106] In at least one embodiment of the present application, the method further comprises:

[0107] S306If the adjacent gas concentration difference value is less than the gas concentration threshold value, gas leakage detection is performed in the next cycle.

[0108] Embodiment three:

[0109] Please refer to the accompanying Figure 3 In this embodiment, the minimum value is selected from the real-time gas concentration data to obtain the minimum gas concentration value, and the minimum gas concentration value is mapped to the corresponding valve, and the corresponding valve is marked as a "target valve".

[0110] The gas concentration value of the branch where the target valve is located is obtained to obtain adjacent concentration value data.

[0111] The difference between the adjacent gas concentration value and the minimum gas concentration value is calculated to form a concentration difference value.

[0112] The calculated concentration difference value is compared with the preset concentration threshold value to determine whether it exceeds the safety range. If it exceeds, a target pipeline breakage signal is generated.

[0113] After generating the pipeline breakage signal, the system automatically generates and executes a branch valve closing signal to isolate the problem branch.

[0114] If the concentration difference value does not exceed the threshold value, the system enters the next detection cycle and continues to monitor the gas concentration data in real time.

[0115] By marking the target valve corresponding to the minimum concentration value and combining the difference calculation of the adjacent concentration value, the precise positioning of the leakage point or the breakage area is realized.

[0116] Using the adjacent concentration difference value analysis method, small leakage situations can be detected, which makes up for the defects of traditional technology in responding to trace leakage.

[0117] The breakage signal is automatically generated and the branch valve is closed in conjunction, without the need for manual intervention, which greatly improves the efficiency of accident handling.

[0118] The closing operation of the branch valve effectively limits the range of gas leakage, reducing the risk of secondary disasters such as fire and explosion. At the same time, other branches can normally use gas to ensure that other normal valves can be used.

[0119] In at least one embodiment of the present application, the branch valve is arranged between the target valve and the total gas valve, and each branch valve controls one or more household gas valves.

[0120] In at least one embodiment of the present application, the target pipeline damage signal includes the floor where the branch valve is located, the position information of the target valve, and the corresponding room information.

[0121] In at least one embodiment of the present application, the step of calculating the difference between the adjacent gas concentration value and the minimum gas concentration value to obtain the adjacent gas concentration difference value comprises:

[0122] S303, obtaining the temperature value of the branch valve to generate a first temperature value;

[0123] S307, obtaining the temperature value of the target valve to generate a second temperature value;

[0124] S308, calculating the temperature difference value according to the first temperature value and the second temperature value, and calculating the gas concentration compensation value according to the temperature difference value;

[0125] S309, summing the minimum gas concentration value and the gas concentration compensation value to obtain the summed gas concentration value;

[0126] S304, comparing the summed gas concentration value with the gas concentration threshold value.

[0127] Please refer to the accompanying Figure 3 In this embodiment, branch valves are arranged between the target valve and the total gas valve, and each branch valve is responsible for the gas supply control of one or more users.

[0128] Through zoning control, the branch valve can be closed in time when detecting gas leakage, and the leakage area is isolated.

[0129] The target pipeline damage signal not only includes the leakage detection result, but also specifically points to the floor where the branch valve is located, the position of the target valve, and the room information.

[0130] Provide detailed location information for emergency response to help management personnel quickly locate and handle the problem area.

[0131] The gas concentration values of the target valve and its branch valves are calculated by difference to analyze the concentration change trend.

[0132] The temperature values of the branch valve and the target valve are collected to generate corresponding temperature data.

[0133] The gas concentration compensation value is calculated based on the temperature difference, which is used to correct the accuracy of the detection data.

[0134] The temperature fluctuation reduces the interference on the gas concentration detection, improving the reliability of the concentration data.

[0135] The corrected gas concentration value is compared with the threshold value to determine whether there is a leak or abnormal concentration.

[0136] The compensated concentration data is analyzed to ensure that the detection result is more accurate and reliable.

[0137] Avoiding the influence of temperature on the gas concentration in the pipeline, thereby improving the accuracy of gas monitoring.

[0138] The setting of the branch valve realizes the zoning management of gas supply, avoiding the problem of interruption of gas supply in the whole building caused by the closing of the total valve.

[0139] The target pipeline damage signal contains detailed location information, helping the manager to quickly locate the problem area, significantly shortening the accident handling time.

[0140] The temperature difference and concentration compensation mechanism reduces the influence of environmental factors on the detection accuracy, adapting to complex and variable use environment.

[0141] Automatic generation of damage signal and branch valve closing signal reduces the time cost of human intervention and significantly improves the efficiency of accident response.

[0142] Zoning management combined with real-time monitoring avoids fire or explosion accidents caused by gas leakage and diffusion, significantly improving the safety of the gas system.

[0143] In at least one embodiment of the present application, the method further comprises:

[0144] S401, obtaining the gas concentration value of the environment where the target valve is located, and generating an environmental gas concentration value;

[0145] S402, comparing the environmental gas concentration value with the environmental gas concentration threshold value;

[0146] S403, if the environmental gas concentration value is greater than the environmental gas concentration threshold value, a target valve gas leakage signal is generated.

[0147] Embodiment four:

[0148] Please refer to the attached Figure 4In this embodiment, the gas concentration in the environment around the target valve is collected by sensors or detection devices to generate an environmental gas concentration value.

[0149] The external environment of the target valve is monitored to capture gas that may leak into the environment.

[0150] The detected environmental concentration value is compared with the preset environmental gas concentration threshold to determine whether the gas concentration in the environment reaches a dangerous level.

[0151] By comparing with the environmental gas concentration threshold, it is determined whether there is gas leakage or abnormal concentration around the target valve.

[0152] When the environmental concentration value exceeds the environmental gas concentration threshold, a gas leakage signal is automatically generated for subsequent processing.

[0153] When the environmental concentration value exceeds the environmental gas concentration threshold, a gas leakage signal is automatically generated for subsequent processing.

[0154] When the gas leakage signal is detected, the system can timely inform the relevant management personnel and start the necessary emergency response measures.

[0155] The pain point of the difficulty in monitoring the leakage of the gas pipeline outside the building in the traditional technology is solved. By collecting the environmental concentration value in real time and automatically generating the leakage signal, the automation of leakage detection and response is realized, which greatly improves the efficiency and safety of the system.

[0156] The setting of the environmental concentration threshold enables the system to quickly capture trace gas leakage and avoid the risk of accident expansion.

[0157] It is suitable for detection of gas pipelines outside the building wall, especially when the pipeline is exposed to an open environment. By monitoring the gas concentration in the surrounding air, the detection range is effectively improved.

[0158] The generation and alarm of the leakage signal ensure that the management personnel can learn about it in time and take measures, reducing the risk of fire or explosion caused by gas leakage.

[0159] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the present disclosure.

[0160] The above-described embodiments are merely illustrative of several embodiments of the present application, which are described in more detail and in a specific and detailed manner, but should not be construed as limiting the scope of the patent of the present application. It should be noted that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A method for preventing leakage of a gas pipeline, characterized in that: The method comprises: Obtain the gas flow rate of the total gas valve of the target building within the detection time and generate the total gas flow rate value; Obtain the sum of the gas flow through each gas valve entering the target building during the detection time to obtain the total gas value; Calculate the difference between the total gas passing value and the gas sum value to obtain a gas difference; The gas difference is compared with a gas quantity threshold. If the gas difference is greater than the gas quantity threshold, a gas leakage signal is generated and executed to control the main gas valve to close and send the gas leakage signal to the outside.

2. The gas pipeline leakage prevention method according to claim 1, characterized in that: The method further comprises: If the gas difference is less than the gas quantity threshold, gas leakage detection is performed in the next cycle.

3. The gas pipeline leakage prevention method according to claim 1, characterized in that: The method further comprises: Obtain the gas concentration in each gas valve in the target building and generate real-time gas concentration data; Selecting a maximum gas concentration value and a minimum gas concentration value from the real-time gas concentration data; Calculating the difference between the maximum gas concentration value and the minimum gas concentration value to obtain a gas concentration difference; The gas concentration difference is compared with a gas concentration threshold value. If the gas concentration difference is greater than the gas concentration threshold value, a pipeline damage signal is generated and sent to the outside.

4. The gas pipeline leakage prevention method according to claim 2, characterized in that: The method further comprises: If the gas concentration difference is less than the gas concentration threshold, gas leakage detection is performed in the next cycle.

5. The gas pipeline leakage prevention method according to claim 2, characterized in that: The method further comprises: Mark the valve corresponding to the minimum gas concentration value as the target valve; Obtain the gas concentration value of the branch valve where the target valve is located, and obtain the adjacent gas concentration values; Calculating the difference between the adjacent gas concentration values ​​and the minimum gas concentration value to obtain the adjacent gas concentration difference; Comparing the adjacent gas concentration difference with the gas concentration threshold, and generating a target pipeline damage signal if the adjacent gas concentration difference is greater than the gas concentration threshold; A branch valve closing signal is generated according to the target pipeline damage signal, and the branch valve closing signal is executed to close the branch valve.

6. The gas pipeline leakage prevention method according to claim 5, characterized in that: The method further comprises: If the adjacent gas concentration difference is less than the gas concentration threshold, gas leakage detection is performed in the next cycle.

7. The gas pipeline leakage prevention method according to claim 5, characterized in that: The branch valves are arranged between the target valve and the main gas valve, and each of the branch valves controls one or more gas valves entering the house.

8. The gas pipeline leakage prevention method according to claim 5, characterized in that: The target pipeline damage signal includes: the floor where the branch valve is located, the location information of the target valve and the corresponding room information.

9. The gas pipeline leakage prevention method according to claim 5, characterized in that: The step of calculating the difference between the adjacent gas concentration values ​​and the minimum gas concentration value to obtain the adjacent gas concentration difference comprises: Acquire a temperature value of a branch valve to generate a first temperature value; Obtaining a temperature value of a target valve and generating a second temperature value; Calculating a temperature difference based on the first temperature value and the second temperature value, and calculating a gas concentration compensation value based on the temperature difference; Calculating the sum of the minimum gas concentration value and the gas concentration compensation value to obtain a summed gas concentration value; The summed gas concentration value is compared with a gas concentration threshold.

10. The gas pipeline leakage prevention method according to claim 5, characterized in that: The method further comprises: Obtain the gas concentration value of the environment where the target valve is located and generate the ambient gas concentration value; The ambient gas concentration value is compared with an ambient gas concentration threshold value, and if the ambient gas concentration value is greater than the ambient gas concentration threshold value, a target valve gas leakage signal is generated.

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