JP2025183010A - Valve diagnostic device and valve diagnostic method - Google Patents

Abstract

The present invention provides a method for suitably diagnosing the state of a valve during construction of a system that handles fluid.
[Solution] The system comprises a construction condition input means 11 for inputting construction conditions including construction procedures and construction processes for construction of a system that handles fluids, a diagnosis target valve recognition means 12 for recognizing a valve to be diagnosed based on the construction conditions, a valve operation process recognition means 13 for recognizing a scheduled date and time for operating the valve to be diagnosed based on the construction conditions as a valve operation process, a diagnosis schedule generation means 14 for generating scheduled dates and times for acquiring data on the valve to be diagnosed based on the construction conditions and the valve operation process as a diagnosis schedule, a data acquisition means 15 for acquiring data on the valve to be diagnosed based on the diagnosis schedule and storing this data in a diagnosis database 16 as diagnostic data, and a diagnosis means 17 for retrieving and comparing multiple pieces of diagnostic data for the same valve to be diagnosed that have different acquisition dates and times and that are stored in the diagnostic database, and determining and diagnosing the state of the valve to be diagnosed.
[Selected Figure] Figure 1

Description

Embodiments of the present invention relate to a valve diagnostic device and a valve diagnostic method.

When inspecting or repairing pumps, tanks, etc. at plants that handle fluids such as water, the vent valve and drain valve are opened to remove air and the water is drained. After the repair is completed, the drain valve is closed and the tank is refilled with water or other fluid, and the vent valve is then closed.

When draining or filling the water, debris, scale, and other solidified material can flow through and remain near the valve disc and valve seat of the vent or drain valve, preventing the valve from closing completely. If this is not noticed, a small amount of water may continue to leak. In addition, with high-temperature, high-pressure water, erosion and cavitation can wear away the valve disc over time, increasing the amount of leakage and potentially affecting the operation of the pump, tank, and even the operation of the plant.

Japanese Patent Application Laid-Open No. 2005-308540

To prevent the above-mentioned events, plant maintenance involves managing water quality to reduce the generation of debris and scale (although there are limits to this, as changes in water quality can affect plant performance), or managing the closed state of valves by retightening and checking the position of the valve stem. However, there are limits to what can be done, as debris and scale are issues of tiny, invisible foreign matter inside valves and the piping upstream and downstream of the valves.

In response to this, methods can be considered for quantitatively determining the open/close state of the valve, particularly slight valve openings caused by foreign matter being trapped between the valve disc and the valve seat. For example, one method detects changes in the stress generated in the stem or yoke when the valve is tightened due to foreign matter being trapped between the valve disc and the valve seat (Patent Document 1).

It is also possible to detect differences in vibration response due to differences in the valve's open/closed state when the target valve is struck. For example, when the valve is in an open state, such as slightly open, and when it is completely closed, the force with which the valve disc is pressed against the valve seat and the state of contact between the valve disc and the valve seat are different, resulting in different rigidity and constraints in each part, and therefore a different vibration response when the valve is struck with a hammer or the like. By detecting this vibration response, it is possible to estimate valve failure, abnormality, and the open/close state, including slightly open.

When a valve is struck, its vibration response will exhibit a unique pattern depending on the valve's structure, material, the force applied to the stem and yoke depending on the valve's open/close state, the state of contact between the valve disc and valve seat, and other factors. One of these patterns is the frequency-amplitude characteristic, which can be obtained by Fourier transforming the valve vibration data measured by a vibration sensor when the valve is struck. In other words, a reference frequency-amplitude pattern is recorded in advance by striking the target valve in its new condition, etc., and then by repeating the striking and recording at different times, any changes in the frequency-amplitude pattern from the reference can be detected, and the state of the valve can be detected.

In addition, the method disclosed in Patent Document 1 involves turning the valve handle to close the valve, which lowers the valve stem and presses the valve disc against the valve seat. This action-reaction relationship causes stretching and compression in the valve stem and the yoke that supports it. Naturally, this stretching and compression differs when the valve disc is properly pressed against the valve seat and when a foreign object is caught between the valve disc and the valve seat, and this method detects this change by detecting distortion in the valve stem and yoke.

However, the above-mentioned methods pose a challenge in large-scale plants, such as nuclear power plants, which have hundreds to thousands of vent and drain valves. These methods must address differences in characteristics that arise due to individual differences between valves and differences in installation conditions, and require recording unique reference data for each valve, resulting in a huge amount of work. This reference data is not common even for valves of the same model. Furthermore, even if reference data is collected individually, it is possible that the reference data may become useless due to changes over time since collection.

Embodiments of the present invention have been made in consideration of the above circumstances, and aim to provide a valve diagnosis device and a valve diagnosis method that can effectively diagnose the condition of valves during construction work in systems that handle fluids.

Another object of embodiments of the present invention is to provide a valve diagnostic device and a valve diagnostic method that can effectively diagnose the post-use closed state of valves used for draining and filling fluids during construction of systems that handle fluids.

In one embodiment of the present invention, a valve diagnostic device is provided with a sensor installed in a valve used in construction work on a fluid-handling system, and diagnoses the condition of the valve using data acquired by the sensor. The device is characterized by comprising: a construction condition input means for inputting construction conditions, including the construction procedure and construction process, a diagnosis target valve recognition means for recognizing the valve to be diagnosed as a diagnosis target valve based on the construction conditions, a valve operation process recognition means for recognizing the scheduled dates and times for opening and closing the diagnosis target valve as valve operation processes based on the construction conditions, a diagnosis schedule generation means for generating a diagnosis schedule with scheduled dates and times for acquiring data on the diagnosis target valve using the sensor based on the construction conditions and the valve operation process, a data acquisition means for acquiring data on the diagnosis target valve using the sensor based on the diagnostic schedule and storing this data in a diagnostic database as diagnostic data, and a diagnostic means for retrieving and comparing multiple pieces of diagnostic data for the same diagnosis target valve, which are acquired at different dates and times and which are stored in the diagnostic database, to determine and diagnose the condition of the diagnosis target valve.

A valve diagnosis method according to an embodiment of the present invention is a valve diagnosis method in which a sensor is installed in a valve used in construction work in a fluid-handling system, and data acquired by the sensor is used to diagnose the condition of the valve. The method comprises the steps of: inputting construction conditions, including the construction procedure and construction process, using a construction condition input means; recognizing the valve to be diagnosed as the valve to be diagnosed based on the construction conditions using a diagnosis target valve recognition means; recognizing the planned dates and times for opening and closing the valve to be diagnosed as valve operation processes based on the construction conditions using a valve operation process recognition means; generating a diagnosis schedule based on the construction conditions and the valve operation process, including planned dates and times for acquiring data on the valve to be diagnosed using the sensor; acquiring data on the valve to be diagnosed using the sensor based on the diagnostic schedule using a data acquisition means, and storing this data in a diagnostic database as diagnostic data; and retrieving and comparing multiple pieces of diagnostic data for the same valve to be diagnosed that have different acquisition dates and times and are stored in the diagnostic database using a diagnostic means, to determine and diagnose the condition of the valve to be diagnosed.

According to an embodiment of the present invention, it is possible to effectively diagnose the state of valves during construction work on systems that handle fluids. Furthermore, it is possible to effectively diagnose the closed state of valves used for draining and filling fluids during construction work on systems that handle fluids.

FIG. 1 is a block diagram showing the configuration of a valve diagnosis device according to an embodiment. 2 is a system diagram of a system having a valve to be diagnosed by the valve diagnosis device of FIG. 1 ; FIG. 3 is a longitudinal cross-sectional view showing an example of the valve (vent valve, drain valve) of FIG. 2 . 2 is an explanatory diagram showing interfaces provided in the construction condition input means, the diagnosis target valve recognition means, the valve operation process recognition means, and the diagnosis schedule generation means shown in FIG. 1 ; FIG. 2 is an explanatory diagram illustrating a situation in which data is acquired by the data acquisition unit of FIG. 1 . FIG. 2 is an explanatory diagram showing a screen interface provided in the diagnostic unit of FIG. 1 ;

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
Fig. 1 is a block diagram showing the configuration of a valve diagnostic device according to one embodiment. The valve diagnostic device 10 shown in Fig. 1 diagnoses the closed state of valves used in construction work on fluid-handling systems in a plant, particularly valves used for fluid drainage (e.g., water draining) and fluid filling (e.g., water filling) during the construction work. More specifically, the valve diagnostic device 10 identifies a valve used for fluid drainage and fluid filling as a target valve 1 (Fig. 5), and diagnoses a slightly open state of the target valve 1 due to poor closing after use using data acquired by a sensor (e.g., a vibration sensor 26 described below) installed in the target valve 1.

As shown in Figure 1, the valve diagnosis device 10 is composed of a construction condition input means 11, a diagnosis target valve recognition means 12, a valve operation process recognition means 13, a diagnosis schedule generation means 14, a data acquisition means 15, a diagnosis database 16, and a diagnosis means 17.

Figure 2 shows a system that handles a fluid, for example, water. In this system 100, the main system 110A is configured by arranging, in order from upstream, a valve 101, a pump 103, a check valve 104, a valve 105, and a heat exchanger 107 on a pipe 102, with valves 106, 108, and 109 connected to the heat exchanger 107. The first sub-system 110B is configured by arranging, in pipe 117, vent valves 111 and 113, and a drain receiver 122. The second sub-system 110C is configured by arranging, in pipe 118, drain valves 112 and 114, and a drain receiver 123. The third sub-system 110D is configured by arranging, in pipe 119, a vent valve 115 and a drain receiver 121. The fourth sub-system 110E is configured by arranging a drain valve 116 and the drainage receiver 123 in the piping 120.

The first through fourth secondary systems 110B-110E described above are systems used to drain and fill the main system 110A of the system 100 during construction of the main system 110A. For example, when inspecting the heat exchanger 107, valves 105, 106, 108, and 109 of the main system are closed to isolate the heat exchanger 107, and vent valve 115, drain valve 116, vent valve 113, and drain valve 114 are opened to drain (drain) the water inside the heat exchanger 107. After draining is complete, the heat exchanger 107 is disassembled for inspection. After disassembly and inspection of the heat exchanger 107 is completed, drain valves 114 and 116 are closed, and water is drawn in from another water supply system to fill the system. After filling the system with water, vent valves 115 and 113 are closed.

For example, when inspecting pump 103, main system valves 101 and 105 are closed, and vent valve 111 and drain valve 112 are opened to drain the water. After draining the water, pump 103 is inspected. After inspecting pump 103, drain valve 112 is closed and water is drawn in from another water supply system to fill the tank, and after filling the tank with water, vent valve 111 is closed.

As mentioned above, vent valves 111, 113, 115 and drain valves 112, 114, 116 are valves that are closed after construction of main system 110A is completed, and most are manual valves as shown in Figure 3. Figure 3(A) shows a gate valve 2, which is closed when the handle 2A is manually operated and the valve disc 2C is pressed against and contacts the valve seat 2D of the valve casing 2E via the valve stem 2B supported by the valve casing 2E. Figure 3(B) shows a globe valve 3, which is closed when the handle 3A is manually operated and the valve disc 3C is pressed against and contacts the valve seat 3D of the valve casing 3E via the valve stem 3B supported by the valve casing 3E.

However, with these valves (gate valve 2, globe valve 3), foreign matter contained in the water may remain between valve disc 2C and valve seat 2D, and between valve disc 3C and valve seat 3D after draining or filling with water. In such cases, vent valves 111, 113, 115 and drain valves 112, 114, 116 shown in Figure 2, which are composed of valves including manual valves such as gate valve 2 and globe valve 3, may not be able to maintain a closed state when closed, and may enter a slightly open state due to improper closure. The valve diagnostic device 10 of this embodiment, shown in Figure 1, uses a valve including a manual valve such as gate valve 2 and globe valve 3 as the diagnostic target valve 1 and diagnoses the closure state of this diagnostic target valve 1 after use.

The construction condition input means 11 inputs construction conditions, including construction procedures and construction processes for construction work such as inspecting equipment in the main system 110A of the system 100, manually or via a computer program. The construction procedures specify the valves to be used for the work and the procedures for using those valves, and are set forth in the construction procedure manual 20. The construction processes are also created to specify the timing for operating the valves used in the work. As shown in Figure 4, the construction condition input means 11 includes a construction procedure interface 21 that displays the input construction procedures, and a construction process interface 22 that displays the input construction processes.

The construction procedures and construction processes input by the construction condition input means 11 may be obtained from electronic data managed by an equipment management system, process management system, or equipment maintenance system installed in the plant having the system 100.

The diagnosis target valve recognition means 12 shown in Figure 1 recognizes the valves to be diagnosed (vent valves 111, 113, 115, drain valves 112, 114, 116) as diagnosis target valves 1 based on the construction conditions input by the construction condition input means 11. This recognition by the diagnosis target valve recognition means 12 is performed manually or by a computer program using text data of the construction procedures. The diagnosis target valve recognition means 12 is equipped with a diagnosis target valve interface 23 (Figure 4) that displays the recognized diagnosis target valve 1.

The valve operation process recognition means 13 shown in Figure 1 recognizes the scheduled dates and times when the valve 1 to be diagnosed will be opened and closed as valve operation processes based on the construction conditions input by the construction condition input means 11. This recognition by the valve operation process recognition means 13 is performed by a human system or by a computer program estimating the dates and times when the valve 1 to be diagnosed will be operated from a bar display indicating the duration of the construction process. The valve operation process recognition means 13 is equipped with a valve operation process interface 24 (Figure 4) that displays the recognized valve operation process.

The diagnostic schedule generation means 14 shown in Figure 1 generates a diagnostic schedule of dates and times for acquiring data on the valve 1 to be diagnosed using a sensor (such as the vibration sensor 26 described below) based on the construction conditions input by the construction condition input means 11 and the valve operation process recognized by the valve operation process recognition means 13. The diagnostic schedule generation means 14 generates the diagnostic schedule by taking into account factors such as the installation location and operation process of the valve 1 to be diagnosed, its relationship with other construction work, and other factors, either manually or through a computer program. The diagnostic schedule generation means 14 is equipped with a diagnostic schedule interface 25 (Figure 4) that displays the generated diagnostic schedule (data acquisition dates and times).

The data acquisition means 15 shown in Figure 1 uses a sensor (e.g., the vibration sensor 26 in Figure 5) installed on the valve 1 to acquire data (measurement data) on the valve 1 based on the diagnostic schedule generated by the diagnostic schedule generation means 14, and stores (preserves) this data as diagnostic data in the diagnostic database 16.

For example, as shown in FIG. 5, the data acquisition means 15 includes a vibration sensor 26 installed on the diagnosis target valve 1, which is the valve from which data is acquired, and a recording device 27 that records the vibration data measured by this vibration sensor 26. The vibration sensor 26 is installed on the diagnosis target valve 1 at a data acquisition date and time based on the diagnosis schedule, and the vibration response generated in the diagnosis target valve 1 when the diagnosis target valve 1 is vibrated by a hammer 28 serving as a vibrating means is measured by the vibration sensor 26, and the vibration data (measurement data) based on the vibration response from this vibration sensor 26 is recorded in the recording device 27.

The data acquisition means 15 may also be configured to include a sensor 29 that is installed on the diagnosis target valve 1, which is the valve from which data is acquired, and that measures displacement, stress, or strain during valve operation at this installation position, and a recording device 30 that records the displacement, stress, or strain data (measurement data) measured by this sensor 29.

Measurement data such as vibration data recorded in the recording device 27 or 30 described above is stored as diagnostic data in the diagnostic database 16. At this time, information such as the name of the diagnostic target valve 1 (the valve from which the data was acquired) and the date and time the data was acquired are added to the measurement data measured by the vibration sensor 26 or sensor 29 to form the diagnostic data. In other words, the measurement data is in a standard data format such as binary or CSV, but the diagnostic data file name combines the name of the diagnostic target valve 1 and the date and time the data was acquired with the measurement data so that the diagnostic target valve 1 and the date and time the data was acquired can be uniquely identified. For example, if the name of the diagnostic target valve 1 is zzzzzzzzz and the date and time the data was acquired is yyyy year, mm month, dd day, hh hour, mm minute, ss second, the diagnostic data data file name would be "zzzzzzzzz_yyyy_mm_dd_hh_mm_ss.csv."

Another method is to create two diagnostic data files with the same name but different extensions: an information file recording information such as the name of the valve 1 to be diagnosed and the date and time of data acquisition, and a measurement data file recording the response of the valve 1 to be diagnosed. Note that the valve 1 to be diagnosed may not be identified by its name, but by identification information such as the valve's code or symbol in the plant.

The diagnostic means 17 retrieves and compares multiple diagnostic data sets, acquired at different times and dates, for the same valve 1 to be diagnosed, stored in the diagnostic database 16, and determines and diagnoses the condition of the valve 1 to be diagnosed. The diagnostic means 17 has a screen interface 31 equipped with a data selection interface 32, a selected data display interface 33, and a determination result display interface 34.

In other words, in order to call up the diagnostic data stored in the diagnostic database 16, the diagnostic means 17 displays the name and other identification information of the diagnostic target valve 1 and the data acquisition date and time in the data selection interface 32. This data selection interface 32 is configured to allow selection of the displayed diagnostic data. Furthermore, when multiple diagnostic data with different data acquisition dates and times for the same diagnostic target valve 1 are selected using the data selection interface 32 (for example, diagnostic data for the same diagnostic target valve 1 at the time of delivery, or diagnostic data before and after overhaul and inspection work on equipment in the main system 110A), the diagnostic means 17 calls up the selected diagnostic data from the diagnostic database 16 and displays it in the selected data display interface 33.

The diagnostic means 17 uses a computer program and mathematical techniques to compare the similarities of multiple diagnostic data sets with different data acquisition dates and times for the same diagnostic target valve 1 displayed in the selected data display interface 33, and displays the results of this comparison in the determination result display interface 34. As a result, if it is determined that there is a possibility of a malfunction in the closed state of the diagnostic target valve 1, for example, this is displayed in the determination result display interface 34, and the diagnostic target valve 1 is diagnosed as being in a slightly open state due to a closure failure.

Next, the operation of the valve diagnostic device 10 configured as described above will be described.
1 , first, a step is carried out in which construction conditions (construction procedures and construction steps) for construction of a main system 110A of a system 100 that handles a fluid (e.g., water) are input using construction condition input means 11. Next, a step is carried out in which a diagnosis target valve 1 is recognized based on the construction conditions using diagnosis target valve recognition means 12. Subsequently, a step is carried out in which a valve operation step recognition means 13 recognizes, based on the construction conditions, the scheduled dates and times at which the diagnosis target valve 1 will be opened and closed as valve operation steps.

Next, the diagnostic schedule generation means 14 performs a step of generating a diagnostic schedule that includes planned dates and times for acquiring data (measurement data) of the valve 1 to be diagnosed using sensors (vibration sensor 26, sensor 29) based on the construction conditions input by the construction condition input means 11 and the valve operation process recognized by the valve operation process recognition means 13. Thereafter, the data acquisition means 15 performs a step of acquiring data of the valve 1 to be diagnosed using sensors (vibration sensor 26, sensor 29) based on the diagnostic schedule generated by the diagnostic schedule generation means 14, and storing this data in the diagnostic database 16 as diagnostic data via the recording devices 27, 30.

Finally, the diagnostic means 17 retrieves multiple diagnostic data for the same target valve 1, stored in the diagnostic database 16, but with different data acquisition dates and times, and compares the similarities between these diagnostic data to determine and diagnose the state of the target valve 1, particularly its closed state.

As configured as above, this embodiment provides the following effects.
The data acquisition means 15 acquires measurement data from sensors (vibration sensor 26, sensor 29) installed on the valve 1 to be diagnosed based on a diagnostic schedule generated by the diagnostic schedule generation means 14 on the basis of the construction conditions and the valve operation process, and stores this data as diagnostic data in the diagnostic database 16. The diagnostic means 17 calls up multiple diagnostic data for the same valve 1 to be diagnosed that were acquired at different dates and times from the diagnostic database 16, compares them, and determines and diagnoses the state of the valve 1 to be diagnosed.

For this reason, when valves in sub-systems 110B-110E used for draining and filling fluid during construction of main system 110A of system 100 that handles fluid are designated as the valves to be diagnosed 1, the condition of these valves 1, particularly the closed state of the valves after use, can be suitably diagnosed. As a result, it is possible to diagnose the slightly open state of the valves to be diagnosed 1 due to poor closure, preventing disruption to plant operation due to fluid leaks during operation of the plant including system 100 after construction of system 100 is completed.

The above describes an embodiment of the present invention, but this embodiment is presented as an example and is not intended to limit the scope of the invention. This embodiment can be embodied in a variety of other forms, and various omissions, substitutions, changes, and combinations can be made without departing from the spirit of the invention. Furthermore, these substitutions, changes, and combinations are included within the scope and spirit of the invention, as well as within the scope of the invention and its equivalents as set forth in the claims.

For example, in the above embodiment, the valve 1 to be diagnosed is a valve in one of the sub-systems 110B-110E used for draining and filling fluid during construction of the main system 110A of a large-scale system 100 that handles fluid. However, if the system 100 is small-scale, this embodiment can be applied to a valve in the main system 110A of this system 100 as the valve to be diagnosed 1, and the condition of this valve can be diagnosed.

1... valve to be diagnosed, 10... valve diagnosis device, 11... construction condition input means, 12... valve to be diagnosed recognition means, 13... valve operation process recognition means, 14... diagnosis schedule generation means, 15... data acquisition means, 16... diagnosis database, 17... diagnosis means, 21... construction procedure interface, 22... construction process interface, 23... valve to be diagnosed interface, 24... valve operation process interface, 25... diagnosis schedule interface, 26... vibration sensor, 27... recording device, 28... hammer (vibration means), 29... sensor, 30... recording device, 31... screen interface, 32... data selection interface, 33... selected data display interface, 34... judgment result display interface, 100... system.

Claims (9)

A valve diagnostic device in which a sensor is installed in a valve used in construction of a system that handles fluid, and the device diagnoses the state of the valve using data acquired by the sensor,
a construction condition input means for inputting construction conditions including a construction procedure and a construction process for the construction;
a diagnosis target valve recognition means for recognizing the valve to be diagnosed as a diagnosis target valve based on the construction conditions;
a valve operation process recognition means for recognizing, based on the construction conditions, the scheduled dates and times when the valve to be diagnosed will be opened and closed as a valve operation process;
a diagnostic schedule generating means for generating a diagnostic schedule including scheduled dates and times for acquiring data on the diagnostic target valve using the sensor based on the construction conditions and the valve operation process;
a data acquisition means for acquiring data on the valve to be diagnosed using the sensor based on the diagnostic schedule and storing the data in a diagnostic database as diagnostic data;
and a diagnostic means for calling up and comparing a plurality of diagnostic data for the same valve to be diagnosed that are stored in the diagnostic database but have different acquisition dates and times, and for determining and diagnosing the state of the valve to be diagnosed. The valve diagnosis device described in claim 1, characterized in that the valve to be diagnosed is a valve used for draining fluid and filling fluid during construction of a fluid-handling system. The construction condition input means includes a construction procedure interface that displays the input construction procedure, and a construction process interface that displays the input construction process,
the diagnosis target valve recognition means includes a diagnosis target valve interface that displays the recognized diagnosis target valve,
the valve operation process recognition means includes a valve operation process interface that displays the recognized valve operation process;
3. The valve diagnostic device according to claim 1, wherein the diagnostic schedule generating means is configured to include a diagnostic schedule interface that displays the generated diagnostic schedule. the diagnostic means includes a data selection interface that displays identification information of the valve to be diagnosed and the date and time of data acquisition in order to retrieve diagnostic data stored in the diagnostic database, and that allows the diagnostic data to be selected;
a selected data display interface that retrieves and displays from the diagnostic database a plurality of diagnostic data items that are different in acquisition date and time and are related to the same valve to be diagnosed and that are selected by the data selection interface;
a judgment result display interface that displays a judgment result obtained by comparing the plurality of diagnostic data displayed on the selected data display interface;
3. The valve diagnostic device according to claim 1, further comprising a screen interface including: the data acquisition means includes a vibration sensor installed in the valve to be diagnosed and a recording device that records the vibration data measured by the sensor;
3. The valve diagnosis device according to claim 1, wherein the sensor measures a vibration response generated when the diagnosis target valve is vibrated by a vibrating means, and the vibration data from the sensor is recorded in the recording device. The valve diagnosis device described in claim 1 or 2, characterized in that the data acquisition means is configured to include a sensor installed in the valve to be diagnosed and measuring displacement, stress, or strain during valve operation, and a recording device that records the displacement, stress, or strain data measured by this sensor. The valve diagnosis device described in claim 1 or 2, characterized in that the construction procedures and construction processes input by the construction condition input means are electronic data managed by an equipment management system, process management system, or equipment maintenance system installed in a plant having a fluid handling system. The valve to be diagnosed is a valve used for draining and filling fluid during construction of a fluid-handling system, and the valve diagnosis device described in claim 1 is configured to diagnose a slightly open state due to poor closing of the valve after use. A valve diagnosis method in which a sensor is installed in a valve used in construction of a system that handles a fluid, and a state of the valve is diagnosed using data acquired by the sensor, comprising:
A step of inputting construction conditions including construction procedures and construction processes for the construction using a construction condition input means;
a step of recognizing the valve to be diagnosed as a valve to be diagnosed based on the construction conditions by a valve to be diagnosed recognition means;
a step of recognizing, by a valve operation process recognition means, scheduled dates and times when the diagnosis target valve will be opened and closed based on the construction conditions, as a valve operation process;
generating, as a diagnostic schedule, scheduled dates and times for acquiring data on the diagnostic target valve using the sensor based on the construction conditions and the valve operation process by a diagnostic schedule generating means;
acquiring data on the valve to be diagnosed using the sensor based on the diagnostic schedule by a data acquisition means, and storing the data in a diagnostic database as diagnostic data;
and a step of using a diagnostic means to call up and compare multiple pieces of diagnostic data for the same valve to be diagnosed that are stored in the diagnostic database but have different acquisition dates and times, and to determine and diagnose the state of the valve to be diagnosed.