Valve diagnosis apparatus and valve diagnosis method

Abstract

To suitably diagnose a state of a valve in construction work of a system that handles a fluid.SOLUTION: A valve diagnosis apparatus includes: construction condition input means 11 that inputs construction conditions including a construction procedure and construction processes in construction work of a system that handles a fluid; diagnosis target valve recognition means 12 that recognizes a diagnosis target valve on the basis of the construction conditions; valve operation process recognition means 13 that recognizes, as a valve operation process, a scheduled date and time at which the diagnosis target valve is to be operated on the basis of the construction conditions; diagnosis schedule generation means 14 that generates, as a diagnosis schedule, a scheduled date and time at which data of the diagnosis target valve is to be acquired on the basis of the construction conditions and the valve operation process; data acquisition means 15 that acquires data of the diagnosis target valve on the basis of the diagnosis schedule and stores the data as diagnosis data in a diagnosis database 16; and diagnosis means 17 that calls and compares the plurality of pieces of diagnosis data stored in the diagnosis database for the same diagnosis target valve and having different acquisition dates and times, and determines and diagnoses a state of the diagnosis target valve.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] An embodiment of the present invention relates to a valve diagnostic device and a valve diagnostic method. [Background technology]

[0002] When inspecting or repairing pumps, tanks, etc. in plants that handle fluids such as water, the vent valve and drain valve for venting air are opened to drain the water, and after the repair is completed, the drain valve is closed and the tank is refilled with water or other fluid, and then the vent valve is closed.

[0003] When draining or filling the water, debris, scale, and other solidified materials can flow through and remain near the valve disc and valve seat of the vent valve 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, in the case of high-temperature, high-pressure water, erosion and cavitation can wear down 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. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-308540 Summary of the Invention [Problem to be solved by the invention]

[0005] To prevent the above-mentioned events, plant maintenance involves managing water quality to reduce the generation of debris and scale (there are limits to this, as changes in water quality can affect plant performance), or managing the closed state of valves by tightening or checking the position of the valve stem.However, there are limits to what can be done about debris and scale, as they are tiny, invisible foreign objects inside the valves and the piping upstream and downstream of the valves.

[0006] In response to this, methods can be considered to quantitatively determine the open / close state of the valve, particularly the slight opening of the valve due to foreign matter being caught between the valve disc and the valve seat. For example, there is a method that detects changes in the stress generated in the stem or yoke when the valve is tightened due to foreign matter being caught between the valve disc and the valve seat (Patent Document 1).

[0007] 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, which results in different rigidity and constraints for each part, resulting in different vibration responses 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 the slightly open state.

[0008] Here, the vibration response when a valve is struck will show a unique pattern depending on the valve structure, material, the force applied to the stem and yoke depending on the valve's open / close state, the pressing state of the valve disc and valve seat, etc. One of these patterns is the frequency-amplitude characteristic obtained by Fourier transforming the valve vibration data measured by a vibration sensor when the valve is struck. That is, for the target valve, a reference frequency-amplitude pattern is recorded in advance by striking it in its new condition, etc., and then by repeating the striking and recording at intervals, any changes in the frequency-amplitude pattern from the reference can be detected, and the valve state can be detected based on this.

[0009] In addition, in the method disclosed in Patent Document 1, when the valve handle is turned to close the valve, the valve stem is lowered and the valve disc is pressed against the valve seat, and due to the relationship of action and reaction, the valve stem and the yoke that supports the valve stem are stretched or compressed. Naturally, this stretching or 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 the distortion of the valve stem or yoke.

[0010] However, the above-mentioned methods pose a challenge in large-scale plants, such as nuclear power plants, that 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 they 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 individual reference data is collected, it is possible that the reference data may become useless due to changes over time.

[0011] The embodiments of the present invention have been made in consideration of the above circumstances, and an object of the present invention is to provide a valve diagnosis device and a valve diagnosis method that can suitably diagnose the condition of a valve during construction of a system that handles fluid.

[0012] Another object of the present invention is to provide a valve diagnostic device and a valve diagnostic method that can suitably diagnose the closed state of a valve used for draining and filling fluid during construction of a system that handles fluid. [Means for solving the problem]

[0013] A valve diagnostic device in an embodiment of the present invention is a valve diagnostic device in which a sensor is installed in a valve used in construction of a system that handles a fluid, and which diagnoses the condition of the valve using data acquired by the sensor, and is characterized by comprising: construction condition input means for inputting construction conditions including the construction procedure and construction process for the construction; diagnosis target valve recognition means for recognizing the valve to be diagnosed as the diagnosis target valve based on the construction conditions; valve operation process recognition means for recognizing scheduled dates and times at which the diagnosis target valve will be opened and closed as valve operation processes based on the construction conditions; diagnostic schedule generation means for generating scheduled dates and times at which data of the diagnosis target valve will be acquired using the sensor as a diagnostic schedule based on the construction conditions and the valve operation process; data acquisition means for acquiring data of the diagnosis target valve using the sensor based on the diagnostic schedule and storing this data in a diagnostic database as diagnostic data; and diagnostic means for retrieving and comparing multiple pieces of diagnostic data for the same diagnosis target valve that have different acquisition dates and times and that are stored in the diagnostic database, and determining and diagnosing the condition of the diagnosis target valve.

[0014] a step of acquiring the data of the valve to be diagnosed using the sensor based on the diagnostic schedule and the diagnostic means; and a step of comparing the diagnostic data of the same valve to be diagnosed using the diagnostic means; a step of comparing the diagnostic data of the same valve to be diagnosed using the diagnostic means; a step of comparing the diagnostic data of the same valve to be diagnosed using the diagnostic means; a step of comparing the diagnostic data of the same valve to be diagnosed using the diagnostic means; [Effects of the Invention]

[0015] According to the embodiment of the present invention, it is possible to suitably diagnose the state of a valve during construction of a system that handles a fluid. Furthermore, it is possible to suitably diagnose the closed state of a valve used for draining and filling a fluid during construction of a system that handles a fluid after use. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a block diagram showing the configuration of a valve diagnosis device according to an embodiment. [Figure 2] 2 is a system diagram of a system having a valve to be diagnosed by the valve diagnosis device of FIG. 1; [Figure 3] FIG. 3 is a longitudinal cross-sectional view showing an example of the valve (vent valve, drain valve) in FIG. 2. [Figure 4]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; [Figure 5] FIG. 2 is an explanatory diagram illustrating a situation in which data is acquired by the data acquisition means of FIG. 1; [Figure 6] FIG. 2 is an explanatory diagram showing a screen interface provided in the diagnostic means of FIG. 1; DETAILED DESCRIPTION OF THE INVENTION

[0017] 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 systems that handle fluids in a plant, particularly valves used for fluid drainage (e.g., water draining) to discharge fluid and fluid filling (e.g., water filling) to fill fluid during the construction work. More specifically, the valve diagnostic device 10 identifies a valve used for fluid drainage and fluid filling as a diagnostic target valve 1 (Fig. 5), and diagnoses a slightly open state of the diagnostic 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 diagnostic target valve 1.

[0018] As shown in FIG. 1, the valve diagnosis device 10 includes 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.

[0019] A system for handling a fluid, for example, water, is shown in Figure 2. In this system 100, a main system 110A is configured by arranging a valve 101, a pump 103, a check valve 104, a valve 105, and a heat exchanger 107 in this order from upstream to downstream on a pipe 102, with valves 106, 108, and 109 connected to the heat exchanger 107. A first sub-system 110B is configured by arranging a vent valve 111, a vent valve 113, and a drain receiver 122 on a pipe 117. A second sub-system 110C is configured by arranging a drain valve 112, a drain valve 114, and a drain receiver 123 on a pipe 118. A third sub-system 110D is configured by arranging a vent valve 115 and a drain receiver 121 on a pipe 119. The fourth sub-system 110E is configured by arranging the drain valve 116 and the drain receiver 123 in the pipe 120.

[0020] The first to fourth secondary systems 110B to 110E are systems for draining and filling the main system 110A of the system 100 during construction of the main system 110A. For example, when inspecting the heat exchanger 107, the valves 105, 106, 108, and 109 of the main system are closed to isolate the heat exchanger 107, and the vent valve 115, drain valve 116, vent valve 113, and drain valve 114 are opened to drain (drain) water from the heat exchanger 107. After draining, the heat exchanger 107 is disassembled for inspection. After disassembly and inspection of the heat exchanger 107 is completed, the drain valves 114 and 116 are closed, and water is drawn in from another water supply system to fill the heat exchanger 107. After filling, the vent valves 115 and 113 are closed.

[0021] Furthermore, when inspecting the pump 103, for example, the valves 101 and 105 of the main system are closed, and the vent valve 111 and drain valve 112 are opened to drain the water. After draining the water, the pump 103 is inspected. After inspecting the pump 103, the 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, the vent valve 111 is closed.

[0022] As described above, the vent valves 111, 113, 115 and the drain valves 112, 114, 116 are valves that are closed after construction of the main system 110A is completed, and most of them 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 the valve seat 2D of the valve casing 2E via the valve stem 2B supported by the valve casing 2E and comes into contact with it. 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 the valve seat 3D of the valve casing 3E via the valve stem 3B supported by the valve casing 3E and comes into contact with it.

[0023] 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 FIG. 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 during closing operations, and may enter a slightly open state due to poor closure. The valve diagnosis device 10 of this embodiment shown in FIG. 1 uses a valve including a manual valve such as gate valve 2 and globe valve 3 as the diagnosis target valve 1, and diagnoses the closure state of this diagnosis target valve 1 after use.

[0024] 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 by computer program. The construction procedures specify the valves to be used for the work and the procedures for using those valves, and are written in the construction procedure manual 20. The construction processes are also created to specify the timing for operating the valves used in the construction 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.

[0025] In addition, 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 a plant having the system 100.

[0026] The diagnosis target valve recognition means 12 shown in Fig. 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 by a human system or by a computer program using text data of the construction procedure. The diagnosis target valve recognition means 12 is provided with a diagnosis target valve interface 23 (Fig. 4) that displays the recognized diagnosis target valve 1.

[0027] The valve operation process recognition means 13 shown in Fig. 1 recognizes the scheduled dates and times when the valve 1 to be diagnosed will be opened and closed as the valve operation process, 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 provided with a valve operation process interface 24 (Fig. 4) that displays the recognized valve operation process.

[0028] The diagnostic schedule generation means 14 shown in Fig. 1 generates a diagnostic schedule of dates and times for acquiring data on the valve 1 to be diagnosed using a sensor (such as a 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. At this time, the diagnostic schedule generation means 14 generates the diagnostic schedule by using a human system or a computer program, taking into consideration the installation location and operation process of the valve 1 to be diagnosed, its relationship with other construction work, etc. The diagnostic schedule generation means 14 is provided with a diagnostic schedule interface 25 (Fig. 4) that displays the generated diagnostic schedule (data acquisition dates and times).

[0029] The data acquisition means 15 shown in FIG. 1 acquires data (measurement data) of the valve 1 to be diagnosed by using a sensor (for example, the vibration sensor 26 in FIG. 5) installed on the valve 1 to be diagnosed based on the diagnostic schedule generated by the diagnostic schedule generation means 14, and stores (preserves) this data in the diagnostic database 16 as diagnostic data.

[0030] 5, the data acquisition means 15 has a vibration sensor 26 installed on the diagnosis target valve 1, which is the valve from which data is to be acquired, and a recording device 27 that records vibration data, which is measurement 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 when this diagnosis target valve 1 is vibrated by a hammer 28 serving as a vibrating means, the vibration response generated in the diagnosis target valve 1 is measured by the vibration sensor 26, and vibration data (measurement data) based on the vibration response from this vibration sensor 26 is recorded in the recording device 27.

[0031] In addition, the data acquisition means 15 may be configured to include a sensor 29 that is installed in the diagnosis target valve 1, which is the valve from which data is to be acquired, and that measures displacement, stress, or strain during valve operation at this installation position, and a recording device 30 that records data (measurement data) of the displacement, stress, or strain measured by this sensor 29.

[0032] The measurement data, such as the vibration data recorded in the recording device 27 or 30, is stored as diagnostic data in the diagnostic database 16. At this time, information such as the name of the diagnosis target valve 1, which is the valve from which the data is acquired, and the date and time of data acquisition are added to the measurement data measured by the vibration sensor 26 or 29 to form the diagnostic data. That is, the measurement data is in a normal data format such as binary or CSV, but the data file name of the diagnostic data is a combination of the name of the diagnosis target valve 1 and the date and time of data acquisition with the measurement data so that the diagnosis target valve 1 and the date and time of data acquisition can be uniquely identified. For example, if the name of the diagnosis target valve 1 is zzzzzzzz and the data acquisition date and time is yyyy year, mm month, dd day, hh hour, mm minute, ss second, the data file name of the diagnostic data would be "zzzzzzzz_yyyy_mm_dd_hh_mm_ss.csv."

[0033] Another method is to create two diagnostic data files with a common 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 be identified not by its name but by identification information such as the code or symbol of the valve in the plant.

[0034] The diagnostic means 17 calls up and compares multiple pieces of diagnostic data for the same valve 1 to be diagnosed that have different acquisition dates and times and are stored in the diagnostic database 16, and determines and diagnoses the state of the valve 1 to be diagnosed. The diagnostic means 17 has a screen interface 31 that includes a data selection interface 32, a selected data display interface 33, and a determination result display interface 34.

[0035] That is, in order to call up the diagnostic data stored in the diagnostic database 16, the diagnostic means 17 displays the identification information such as the name of the valve 1 to be diagnosed and the data acquisition date and time in the data selection interface 32. This data selection interface 32 is configured so that the displayed diagnostic data can be selected. Furthermore, when multiple diagnostic data with different data acquisition dates and times for the same valve 1 to be diagnosed (for example, diagnostic data for the same valve 1 to be diagnosed at the time of delivery, or diagnostic data before and after overhaul and inspection work on equipment in the main system 110A) are selected using the data selection interface 32, 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.

[0036] The diagnostic means 17 uses a computer program and a mathematical method to compare the similarities of multiple diagnostic data sets with different data acquisition dates and times for the same valve 1 to be diagnosed, which are displayed in the selected data display interface 33, and displays the judgment results from this comparison in the judgment result display interface 34. As a result, if it is judged that there is a possibility of a malfunction in the closed state of the valve 1 to be diagnosed, for example, this is displayed in the judgment result display interface 34, and the slightly open state of the valve 1 to be diagnosed due to a closing failure is diagnosed.

[0037] 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.

[0038] Next, the diagnostic schedule generating means 14 executes a step of generating, as a diagnostic schedule, scheduled dates and times for acquiring data (measurement data) of the valve 1 to be diagnosed using sensors (vibration sensors 26, sensors 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 recognizing means 13. Thereafter, the data acquiring means 15 executes a step of acquiring data of the valve 1 to be diagnosed using sensors (vibration sensors 26, sensors 29) based on the diagnostic schedule generated by the diagnostic schedule generating means 14, and storing this data in the diagnostic database 16 via the recording devices 27, 30 as diagnostic data.

[0039] Finally, the diagnostic means 17 executes a step of calling up multiple pieces of diagnostic data stored in the diagnostic database 16 for the same valve 1 to be diagnosed but with different data acquisition dates and times, comparing the similarities of these pieces of diagnostic data, and determining and diagnosing the state of the valve 1 to be diagnosed, particularly the closed state.

[0040] 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 the diagnostic schedule generated by the diagnostic schedule generation means 14 based on 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 have different acquisition dates and times from the diagnostic database 16, compares them, and determines and diagnoses the state of the valve 1 to be diagnosed.

[0041] Therefore, when valves in sub-systems 110B to 110E used for draining and filling fluid during construction of main system 110A of system 100 that handles fluid are set as the valves to be diagnosed 1, it is possible to suitably diagnose the state of this valve 1 to be diagnosed, particularly the closed state after use of the valve 1 to be diagnosed. As a result, it is possible to diagnose the slightly open state due to a closing failure of this valve 1 to be diagnosed, and therefore it is possible to prevent disruption to plant operation due to fluid leakage during operation of a plant including system 100 after construction of system 100 is completed.

[0042] Although the embodiment of the present invention has been described above, this embodiment is presented as an example and is not intended to limit the scope of the invention. This embodiment can be embodied in various other forms, and various omissions, substitutions, changes, and combinations can be made without departing from the spirit of the invention. Furthermore, such substitutions, changes, and combinations are included in the scope and spirit of the invention, and are also included in the inventions described in the claims and their equivalents.

[0043] For example, in the above embodiment, the valve 1 to be diagnosed is a valve in one of the sub-systems 110B to 110E that is 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 may be applied to a valve in the main system 110A of this system 100 as the valve to be diagnosed 1, and the state of this valve may be diagnosed. [Explanation of symbols]

[0044] 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 (vibrating 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

1. A valve diagnostic device in which a sensor is installed in a valve used in construction of a system that handles fluid, and which 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.

2. 2. The valve diagnostic device according to claim 1, wherein the valve to be diagnosed is a valve used for draining fluid and filling fluid during construction of a system that handles fluid.

3. 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.

4. 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 call up 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:

5. 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.

6. 3. The valve diagnosis device according to claim 1, wherein the data acquisition means comprises a sensor that is installed in the valve to be diagnosed and that measures displacement, stress, or strain during valve operation, and a recording device that records the displacement, stress, or strain data measured by the sensor.

7. 3. The valve diagnosis device according to claim 1, wherein the construction procedure and construction process input by the construction condition input means are electronic data managed by an equipment management system, a process management system, or an equipment maintenance system provided in a plant having a system that handles fluids.

8. 2. The valve diagnosis device according to claim 1, wherein the valve to be diagnosed is a valve used for draining fluid and filling fluid during construction of a system that handles fluid, and the device is configured to diagnose a slightly open state due to a closing failure of this valve after use.

9. 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.

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