Wireless opening meter, valve maintenance support system and support method

Abstract

The invention provides a wireless opening meter, a valve maintenance support system and a support method, which can diagnose the bad condition of a valve without using a high-specification positioner and improve the working efficiency of valve maintenance. The wireless opening meter comprises: a measurement unit for measuring the opening degree of the control valve, the air pressure supplied to the operator, and the temperature on the outlet side; a malfunction diagnosis unit that calculates an index of the valve until a change in malfunction occurs on the basis of the measured value, and performs malfunction diagnosis of the valve on the basis of the index; a wireless communication unit that wirelessly transmits the index and the result of the failure diagnosis to a valve maintenance support device; and an adjustment unit that compares the index with a predetermined index determination threshold value, and performs an interval extension process for the operation time of the wireless opening meter by making the operation cycle of the wireless opening meter longer than an initial value when it is determined that the degree of progress of the valve to the failure is small.

Description

Technical Field

[0001] The present invention relates to a technology for supporting maintenance work, and more particularly to a wireless valve opening meter, a valve maintenance support system, and a support method, which realize support for highly efficient valve maintenance work. Background Art

[0002] Valves used in petrochemical plants, etc. (such as Figure 15 The control valves require special attention to safety and are therefore subject to regular maintenance. Figure 15 The control valve shown includes a valve body 100 for opening and closing a passage for fluid flow; a positioner 101 for converting an input electrical signal into air pressure; and an operator 102 for operating the valve body 100 according to the air pressure supplied from the positioner 101 .

[0003] In order to set up Figure 15 To improve the efficiency of valve maintenance work in valve plants such as those shown above, technologies have been proposed for detecting the occurrence of stick-slip in the valve's sliding portion (see Patent Document 1), determining the hunting state of the valve (see Patent Document 2), and detecting scale adhesion to the valve (see Patent Document 3). These technologies can be implemented using a positioner that detects the valve's opening position.

[0004] The fault detection technologies (diagnosis technologies) disclosed in Patent Documents 1 to 3 require high-specification positioners. If the positioner included in an existing control valve is not of a high-specification type, the positioner must be replaced. However, depending on the specifications of the control valve itself or the installation conditions in the plant, positioner replacement may be difficult or impossible, leading to a demand for improvements.

[0005] [Prior art literature]

[0006] [Patent Document]

[0007] [Patent Document 1] Japanese Patent No. 3254624

[0008] [Patent Document 2] Japanese Patent Application Laid-Open No. 2015-114942

[0009] [Patent Document 3] Japanese Patent Application Laid-Open No. 2015-114943 Summary of the Invention

[0010] [Problems to be solved by the invention]

[0011] The present invention is made to solve the above-mentioned problems, and its purpose is to provide a wireless valve opening meter, a valve maintenance support system and a support method that can realize the diagnosis of control valve failure without using a high-specification positioner and improve the efficiency of control valve maintenance.

[0012] [Technical means to solve the problem]

[0013] The present invention provides a wireless valve position meter, a battery-driven wireless valve position meter installed in a control valve, characterized by comprising: a measuring unit configured to measure at least one of the valve position of the control valve, the air pressure supplied to the operator of the control valve, and the temperature on the outlet side of the control valve; a failure diagnosis unit configured to calculate an index of changes in the control valve until a failure occurs based on the measurement value obtained by the measuring unit, and to perform a failure diagnosis of the control valve based on the index; a wireless communication unit configured to wirelessly transmit the index and the result of the failure diagnosis to a valve maintenance support device; and an adjustment unit configured to compare the index with a predetermined index judgment threshold value, and, if it is determined that the degree of progress of the control valve toward a failure is small, to extend the operation cycle of the wireless valve position meter by lengthening the operation cycle of the wireless valve position meter compared to an initial value, thereby performing an interval extension process for the operation time of the wireless valve position meter; and, if it is determined that the degree of progress is large, to set the operation cycle to the initial value and stop the interval extension process.

[0014] Furthermore, in one configuration example of the wireless aperture meter of the present invention, the failure of the control valve that is the target of the failure diagnosis is a failure that is specific to the control valve and that gradually develops.

[0015] In addition, a structural example of the wireless aperture meter of the present invention is characterized in that, when the process of multiple types of faulty conditions of the control valve is observed at the same time, each of the indicator judgment thresholds corresponding to the multiple types of faulty conditions is pre-set, so that for the multiple types of faulty conditions, the period from when the interval extension processing is stopped by comparing the indicator with the indicator judgment threshold until the faulty condition is detected is the same.

[0016] In addition, the valve maintenance support system of the present invention is characterized in that it includes: a wireless opening meter of a battery-driven type installed in the control valve; and a valve maintenance support device, wherein the wireless opening meter includes: a measuring unit configured to measure at least one of the opening of the control valve, the air pressure supplied to the operator of the control valve, and the temperature on the outlet side of the control valve; a failure diagnosis unit configured to calculate an index of changes in the control valve until a failure occurs based on the measurement value obtained by the measuring unit, and perform a failure diagnosis of the control valve based on the index; a first wireless communication unit configured to wirelessly transmit the index and the result of the failure diagnosis to the valve maintenance support device. and an adjustment unit configured to compare the indicator with a prescribed indicator judgment threshold value, and when it is determined that the degree of progress of the control valve toward an abnormal condition is small, make the operating cycle of the wireless aperture meter longer than the initial value, thereby performing an interval extension process for the operating time of the wireless aperture meter, and when it is determined that the degree of progress is large, set the operating cycle to the initial value and stop the interval extension process. The valve maintenance support device includes: a second wireless communication unit configured to receive the indicator and the result of the abnormal condition diagnosis sent from the wireless aperture meter; and a diagnosis result presentation unit configured to present the indicator and the result of the abnormal condition diagnosis received by the second wireless communication unit.

[0017] In addition, the valve maintenance support system of the present invention is characterized in that it includes: a wireless opening meter, which is a battery-driven type installed in the control valve; and a valve maintenance support device, wherein the wireless opening meter includes: a measuring unit, which is configured to measure at least one of the opening of the control valve, the air pressure supplied to the operator of the control valve, and the temperature on the outlet side of the control valve; a first wireless communication unit, which is configured to wirelessly transmit the measurement value obtained by the measuring unit to the valve maintenance support device and receive a command wirelessly transmitted from the valve maintenance support device; and a control unit, which is configured to set the operation cycle of the wireless opening meter in accordance with the command, and the valve maintenance support device includes: a second wireless communication unit, which is configured to receive the measurement value transmitted from the wireless opening meter; a malfunction diagnosis unit, which is configured to diagnose the malfunction based on the first wireless communication unit. The second wireless communication unit calculates an index of the change of the control valve until a malfunction occurs based on the measured value received, and performs a malfunction diagnosis of the control valve based on the index; a diagnosis result presentation unit is configured to present the index and the result of the malfunction diagnosis; and an adjustment unit is configured to compare the index with a prescribed index judgment threshold, and when it is determined that the degree of progress of the control valve toward the malfunction is small, generates a command to set the operating cycle of the wireless aperture meter to a value longer than an initial value, thereby performing an interval extension process of the operating time of the wireless aperture meter, and when it is determined that the degree of progress is large, generates a command to set the operating cycle to the initial value, thereby stopping the interval extension process, and the second wireless communication unit wirelessly sends the command generated by the adjustment unit to the wireless aperture meter.

[0018] Furthermore, in one configuration example of the valve maintenance support system of the present invention, the failure of the control valve that is the target of the failure diagnosis is a gradually developing failure that is unique to the control valve.

[0019] In addition, a structural example of the valve maintenance support system of the present invention is characterized in that, when simultaneously observing the process of multiple types of faulty conditions of the control valve, each of the indicator judgment thresholds corresponding to the multiple types of faulty conditions is pre-set, so that for the multiple types of faulty conditions, the period from when the interval extension processing is stopped by comparing the indicator with the indicator judgment threshold until the faulty condition is detected is the same.

[0020] In addition, in one structural example of the valve maintenance support system of the present invention, the fault condition of the control valve that is the object of the fault diagnosis is at least one of stick-slip, deterioration of the V-shaped gasket, deterioration of the diaphragm of the operator, deterioration of the diaphragm of the valve body, deterioration of parts caused by thermal cycling, damage to the bellows seal, and rupture of the bellows seal.

[0021] The valve maintenance support method of the present invention is characterized by comprising: a first step in which a battery-driven wireless aperture meter installed in a control valve measures at least one of the opening of the control valve, the air pressure supplied to the operator of the control valve, and the temperature on the outlet side of the control valve; a second step in which the wireless aperture meter calculates an index of change in the control valve until a malfunction occurs based on the measured value obtained in the first step; a third step in which the wireless aperture meter performs a malfunction diagnosis of the control valve based on the index; a fourth step in which the wireless aperture meter wirelessly transmits the index and the result of the malfunction diagnosis to a valve maintenance support device; a fifth step in which the wireless aperture meter compares the index with a predetermined index determination threshold value, and if it is determined that the degree of progress toward malfunction of the control valve is small, increases an operating cycle of the wireless aperture meter by longer than an initial value, thereby extending the operating time interval; and a sixth step in which the wireless aperture meter compares the index with the index determination threshold value, and if it is determined that the degree of progress toward malfunction of the control valve is large, sets the operating cycle to the initial value and stops the interval extension process.

[0022] In addition, the valve maintenance support method of the present invention is characterized in that it includes: a first step, a battery-driven wireless opening meter installed in the control valve measures at least one of the opening of the control valve, the air pressure supplied to the operator of the control valve, and the temperature on the outlet side of the control valve; a second step, the wireless opening meter calculates an index of change of the control valve until a malfunction occurs based on the measurement value obtained through the first step; a third step, the wireless opening meter performs malfunction diagnosis of the control valve based on the index; a fourth step, the wireless opening meter wirelessly transmits the index and the result of the malfunction diagnosis to a valve maintenance support device; a fifth step, the valve maintenance support device The support device receives the indicator and the result of the malfunction diagnosis sent from the wireless valve opening meter; in the sixth step, the valve maintenance support device presents the indicator and the result of the malfunction diagnosis received in the fifth step; in the seventh step, the wireless valve opening meter compares the indicator with a specified indicator judgment threshold, and when it is determined that the degree of progress of the control valve toward the malfunction is small, makes the operation cycle of the wireless valve opening meter longer than the initial value, thereby performing an interval extension process of the operation time; and in the eighth step, the wireless valve opening meter compares the indicator with the indicator judgment threshold, and when it is determined that the degree of progress is large, sets the operation cycle to the initial value and stops the interval extension process.

[0023] In addition, the valve maintenance support method of the present invention is characterized in that it includes: a first step, a battery-driven wireless opening meter installed in the control valve measures at least one of the opening of the control valve, the air pressure supplied to the operator of the control valve, and the temperature on the outlet side of the control valve; a second step, the wireless opening meter wirelessly transmits the measurement value obtained in the first step to a valve maintenance support device; a third step, the valve maintenance support device receives the measurement value transmitted from the wireless opening meter; a fourth step, the valve maintenance support device calculates an index of change of the control valve until a malfunction occurs based on the measurement value received in the third step; a fifth step, the valve maintenance support device performs a malfunction diagnosis of the control valve based on the index; a sixth step, the valve maintenance support device presents the index and the result of the malfunction diagnosis; a seventh step In the first step, the valve maintenance support device compares the indicator with a prescribed indicator judgment threshold value, and when it is determined that the progress of the control valve toward the faulty condition is small, generates a command to set the operation cycle of the wireless aperture meter to a value longer than the initial value, thereby performing an interval extension process for the operation time of the wireless aperture meter; in the eighth step, the valve maintenance support device compares the indicator with the indicator judgment threshold value, and when it is determined that the progress is large, generates a command to set the operation cycle to the initial value, thereby stopping the interval extension process; in the ninth step, the valve maintenance support device wirelessly transmits the command generated in the seventh step or the eighth step to the wireless aperture meter; in the tenth step, the wireless aperture meter receives the command; and in the eleventh step, the wireless aperture meter sets the operation cycle of the wireless aperture meter in accordance with the command received in the tenth step.

[0024] [Effects of the Invention]

[0025] According to the present invention, by providing a battery-powered wireless valve gauge with a measuring unit, a fault diagnosis unit, and a wireless communication unit, it is possible to diagnose control valve faults without using a high-specification positioner, thereby improving control valve maintenance efficiency. Furthermore, by providing an adjustment unit, the operating time of the wireless valve gauge can be appropriately extended based on the degree of control valve fault progression, thereby reducing battery consumption.

[0026] Furthermore, the present invention provides a battery-powered wireless valve gauge with a measuring unit and a first wireless communication unit, and a valve maintenance support device with a second wireless communication unit and a failure diagnosis unit. This allows for diagnosis of control valve failures without the use of a high-specification positioner, thereby improving control valve maintenance efficiency. Furthermore, the present invention provides an adjustment unit in the valve maintenance support device and a control unit in the wireless valve gauge, allowing the operating time of the wireless valve gauge to be appropriately extended based on the degree of control valve failure, thereby reducing battery consumption in the wireless valve gauge.

[0027] In addition, in the present invention, when simultaneously observing the process of multiple types of faulty conditions of the control valve, each indicator judgment threshold value corresponding to the multiple types of faulty conditions is pre-set, so that for the multiple types of faulty conditions, the period from when the interval extension processing is stopped by comparing the indicator with the indicator judgment threshold value until the faulty condition is detected is the same. As a result, the grace period until the valve maintenance implementation date and time that the system operator wants to identify can be made the same for the multiple types of faulty conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a block diagram showing the configuration of a wireless valve opening meter in the valve maintenance support system according to the first embodiment of the present invention.

[0029] Figure 2 This is a block diagram showing the configuration of a valve maintenance support device of a valve maintenance support system according to a first embodiment of the present invention.

[0030] Figure 3 This is a flowchart illustrating the operation of the valve maintenance support system according to the first embodiment of the present invention.

[0031] Figure 4 This is a diagram showing an example of the configuration of a plant.

[0032] Figure 5 This is a characteristic diagram showing measurement results when valve stick-slip does not occur in the conventional technology.

[0033] Figure 6 This is a characteristic diagram showing measurement results when valve stick-slip occurs in the conventional technology.

[0034] Figure 7 This is a diagram showing the operating frequency in the conventional technology.

[0035] Figure 8 1 is a characteristic diagram showing measurement results when valve stick-slip does not occur in the first embodiment of the present invention.

[0036] Figure 91 is a characteristic diagram showing measurement results when valve stick-slip occurs in the first embodiment of the present invention.

[0037] Figure 10 This is a diagram showing an example of reducing the operating frequency in the first embodiment of the present invention.

[0038] Figure 11 This is a block diagram showing the configuration of a wireless valve opening meter in a valve maintenance support system according to a second embodiment of the present invention.

[0039] Figure 12 This is a block diagram showing the configuration of a valve maintenance support device of a valve maintenance support system according to a second embodiment of the present invention.

[0040] Figure 13 This is a flowchart illustrating the operation of the valve maintenance support system according to the second embodiment of the present invention.

[0041] Figure 14 This is a block diagram showing an example of the configuration of a computer for realizing the valve maintenance support system according to the first and second embodiments of the present invention.

[0042] Figure 15 This is a diagram showing an example of a control valve.

[0043] [Explanation of Symbols]

[0044] 1.1a: Wireless actuation meter

[0045] 2, 2-A, 2-C, 2-M: Control valve

[0046] 3.3a: Valve maintenance support device

[0047] 10, 30: Valve ID storage unit

[0048] 11: Opening measurement unit

[0049] 12: Pressure measurement unit

[0050] 13: Temperature measurement unit

[0051] 14, 33: Storage

[0052] 15, 34: Adverse Condition Diagnosis Department

[0053] 16, 35: Adjustment Department

[0054] 17, 17a, 31, 31a: Wireless communication unit

[0055] 18, 18a: Control unit

[0056] 19: Battery

[0057] 32, 32a: Diagnosis result display section DETAILED DESCRIPTION

[0058] [Principle 1 of the invention]

[0059] When considering the need to detect the valve position while an existing positioner is installed, and considering the typical installation conditions in a petrochemical plant, it is preferable to install a wirelessly communicating, battery-powered valve position measuring device (wireless position gauge) on the valve. A wireless position gauge eliminates the need for new wiring, increasing its compatibility with existing control valves. Wireless position gauges are designed for long-term use, particularly in detecting (diagnosing) valve failures, and therefore are preferably designed to extend battery life. Furthermore, if an existing positioner is installed, there is no need to completely replace the high-specification positioner; a specification that enhances the detection (diagnosis) of failures such as stick-slip may suffice.

[0060] The inventors noted that stick-slip and other valve failures are cumulative sliding anomalies unique to valves. These failures do not occur suddenly, but rather develop gradually. They also came up with the idea of reducing battery consumption by appropriately extending the operating time of the wireless valve gauge based on the severity of the failure. Furthermore, gradually developing failures are not limited to stick-slip.

[0061] [Principle 2 of the invention]

[0062] Gradually developing faults are not limited to stick-slip; depending on the valve type, multiple different faults may be monitored simultaneously. In this case, because the faults vary, it is not desirable to have no specific pattern in the judgment indicator for appropriately extending the operating time of the wireless actuator based on the degree of progression. For example, if a judgment indicator for stick-slip terminates the interval extension even at a relatively low degree of progression, while a judgment indicator for other abnormalities (specifically described in the embodiments below) continues to extend the interval even at a relatively high degree of progression, this could potentially disrupt plant maintenance operations.

[0063] Therefore, the judgment index (such as a threshold value, etc.) is preferably set so that the period until the probability of detecting the fault is predicted to be high is the same for multiple different types of faults. For example, for all types of faults, they are set to have the following rule: when the probability of detecting the fault is high after 100 days, the interval extension is terminated. Moreover, for multiple different types of faults, if it is determined that any one of the interval extensions of the operating time should be terminated, the interval extension is terminated. Thus, the operator of the complete plant can simply understand that even if the interval extension is terminated due to the progress towards any fault, a grace period of approximately 100 days is expected.

[0064] [First embodiment]

[0065] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. This embodiment corresponds to the above-mentioned inventive principle 1 and inventive principle 2. Figure 1 This is a block diagram showing the structure of a wireless valve opening meter in the valve maintenance support system of this embodiment. In the following embodiments, for simplicity of description, examples of valve identifiers (IDs) are simplified compared to those used in actual plants.

[0066] The battery-driven wireless opening meter 1 installed on the control valve 2 includes: a valve ID storage unit 10, which stores the ID (identification information) inherent to the valve 2 as the installation destination of the wireless opening meter 1; an opening measurement unit 11, which continuously measures the opening of the valve 2; a pressure measurement unit 12, which measures the air pressure supplied to the operator of the valve 2; a temperature measurement unit 13, which measures the temperature on the outlet side of the valve 2; a storage unit 14, which stores the opening measurement value, the pressure measurement value and the temperature measurement value; a fault diagnosis unit 15, which calculates the index of the change of the valve 2 until the fault occurs based on the measurement value, and calculates the fault diagnosis based on the index. Execute malfunction diagnosis of valve 2; the adjustment unit 16 compares the index with the specified index judgment threshold, and when it is determined that the degree of progress of valve 2 toward malfunction is small, makes the operation cycle of the wireless aperture meter 1 longer than the initial value, thereby performing interval extension processing of the operation time of the wireless aperture meter 1; when it is determined that the degree of progress is large, sets the operation cycle to the initial value and stops the interval extension processing; the wireless communication unit 17 wirelessly sends the index and the result of the malfunction diagnosis to the valve maintenance support device; the control unit 18 controls the entire wireless aperture meter; and the battery 19 supplies power to each part of the wireless aperture meter 1.

[0067] Figure 2This is a block diagram showing the structure of the valve maintenance support device of the valve maintenance support system of this embodiment. The valve maintenance support device 3 includes a valve ID storage unit 30 that stores the IDs of control valves 2 that are candidates for maintenance; a wireless communication unit 31 that receives indicators and fault diagnosis results transmitted from the wireless position meter 1; and a diagnosis result presentation unit 32 that presents the indicators and fault diagnosis results received by the wireless communication unit 31.

[0068] Figure 3 This is a flowchart illustrating the operation of the valve maintenance support system of this embodiment. In this embodiment, for example, a plurality of valves are installed in a plant, and unique IDs are pre-assigned to each of these valves. Figure 4 In the example, control valve 2-A and control valve 2-M with valve ID "A" and valve ID "M" are provided in flow path 201-1, and control valve 2-C with valve ID "C" is provided in flow path 201-2. Figure 4 202-A, 202-C and 202-M are flow measuring devices, 203 is a storage tank and 204 is a pressure transmitter.

[0069] exist Figure 4 In the figure, descriptions of valves other than valve 2-A, valve 2-C, and valve 2-M are omitted. In this embodiment, valves 2-A, 2-C, and 2-M are specifically selected as the top priority maintenance targets in a specific periodic plant maintenance, and valve IDs "A," "C," and "M" are pre-stored in valve ID storage unit 30.

[0070] In addition, the valve ID storage unit 10 of the wireless opening meter 1 installed in the valve 2-A stores the ID "A", the valve ID storage unit 10 of the wireless opening meter 1 installed in the valve 2-C stores the ID "C", and the valve ID storage unit 10 of the wireless opening meter 1 installed in the valve 2-M stores the ID "M".

[0071] The opening measuring unit 11 of the wireless opening meter 1 installed in the valve 2-A, valve 2-C, and valve 2-M continuously detects the rotation angle of the valve stem (valve rod) of the valve 2-A, valve 2-C, and valve 2-M, thereby continuously measuring the valve opening ( Figure 3 The structure of the opening measurement unit 11 (opening sensor) is disclosed in, for example, Japanese Patent Application Laid-Open No. 2021-026268, and therefore a detailed description thereof will be omitted.

[0072] The control unit 18 of each wireless type opening meter 1 receives the opening measurement value from the opening measurement unit 11 of the device, and stores the received opening measurement value and the reception time of the opening measurement value in the storage unit 14 ( Figure 3 Step S101).

[0073] On the other hand, the pressure measuring section 12 of each wireless type opening gauge 1 continuously measures the air pressure ( Figure 3 Step S102).

[0074] The control unit 18 of each wireless type aperture meter 1 receives the pressure measurement value from the pressure measurement unit 12 of the device, and stores the received pressure measurement value and the time of receiving the pressure measurement value in the storage unit 14 ( Figure 3 Step S103).

[0075] The temperature measuring section 13 of each wireless type actuation meter 1 continuously measures the temperature of the outlet side of the valve 2-A, the valve 2-C, and the valve 2-M. Figure 3 Step S104).

[0076] The control unit 18 of each wireless type aperture meter 1 receives the temperature measurement value from the temperature measurement unit 13 of the device, and stores the received temperature measurement value and the time of receiving the temperature measurement value in the storage unit 14 ( Figure 3 Step S105).

[0077] Although Figure 3 Although not explicitly described in the , the opening measurement unit 11, pressure measurement unit 12, temperature measurement unit 13, and control unit 18 periodically perform the processing of steps S100 to S105. By repeating the processing of steps S100 to S105, time-series data of opening measurement values, time-series data of pressure measurement values, and time-series data of temperature measurement values are accumulated in the storage unit 14. The measurement cycle of the opening measurement values, pressure measurement values, and temperature measurement values is set to a value shorter than the operating cycle of the wireless opening meter 1, which will be described later.

[0078] Next, the malfunction diagnosis unit 15 of each wireless type opening meter 1 calculates an index ( ) of changes until a malfunction occurs in the valve 2-A, the valve 2-C, or the valve 2-M based on at least one of the time series data of the opening measurement value, the time series data of the pressure measurement value, and the time series data of the temperature measurement value stored in the storage unit 14 of the device. Figure 3 Step S106), and based on the index, perform the bad condition diagnosis of valve 2-A, valve 2-C, and valve 2-M ( Figure 3 Step S107).

[0079] For example, when applying the technology for detecting the occurrence of stick-slip in the sliding portion of a valve (Patent Document 1) to this embodiment, the failure diagnosis unit 15 calculates the mean square value and the average value of the valve opening movement (equivalent to velocity information) calculated from the time series data of the valve opening measurement values during the diagnosis target period. Furthermore, it calculates the ratio Aτ (mean square value / average value) of the average value to the mean square value. The difference Aτ-A between this ratio Aτ and the pre-stored normal state ratio A is used as an indicator of the change until the failure occurs (step S106). If the difference Aτ-A is greater than a predetermined diagnostic threshold, the failure diagnosis unit 15 determines that stick-slip is likely to occur (a failure has been detected). If the difference Aτ-A is less than the diagnostic threshold, the failure diagnosis unit 15 determines that the system is normal (step S107).

[0080] When applying the technology for detecting deterioration of a V-shaped gasket in a valve (Japanese Patent No. 6851938) to this embodiment, the failure diagnosis unit 15 uses the valve speed index (maximum operating speed) calculated from the time series data of the opening measurement values during the diagnosis period, and the valve friction index (pressure difference depending on the opening direction) calculated from the time series data of the opening measurement values and the time series data of the pressure measurement values during the diagnosis period as indicators of changes until a failure occurs (step S106). If the speed index is greater than or equal to a predetermined speed threshold (diagnosis threshold) and the friction index is less than or equal to the predetermined friction threshold (diagnosis threshold), the failure diagnosis unit 15 determines that there is a possibility of V-shaped gasket deterioration (step S107).

[0081] When applying the technology for detecting deterioration of the diaphragm of a valve actuator (Japanese Patent No. 6978252) to this embodiment, the malfunction diagnosis unit 15 uses the product of the valve operation amount (e.g., number of operations or sliding distance) during the diagnosis target period, calculated from the time series data of the valve opening measurement values, and the average pressure value during the diagnosis target period, calculated from the time series data of the pressure measurement values, as an indicator of the change until the malfunction occurs (step S106). If the calculated product exceeds a predetermined diagnostic threshold, the malfunction diagnosis unit 15 determines that there is a possibility of deterioration of the diaphragm of the actuator (step S107).

[0082] When applying the technology for detecting deterioration (hardening) of the valve body's diaphragm (Japanese Patent No. 6981815) to this embodiment, the failure diagnosis unit 15 uses the amount of intrusion into the valve body in the closing direction, calculated from the time-series data of the valve opening measurement values, to identify the valve as fully closed, as an indicator of changes leading to the occurrence of a failure (step S106). If the calculated intrusion amount is below a predetermined diagnostic threshold, the failure diagnosis unit 15 determines that there is a possibility of deterioration of the valve body's diaphragm (step S107).

[0083] When applying the technology for detecting valve component degradation (e.g., seat ring loosening) due to thermal cycling (Japanese Patent No. 6981816) to this embodiment, the failure diagnosis unit 15 uses the product of the valve temperature difference during the diagnosis period, calculated from time-series data of temperature measurements, and the number of cycles as an indicator of the change until a failure occurs (step S106). If the calculated product exceeds a predetermined diagnostic threshold, the failure diagnosis unit 15 determines that there is a possibility of valve component degradation (step S107).

[0084] When the technology for detecting damage to a bellows seal of a valve (Japanese Patent No. 7000123) is applied to this embodiment, the failure diagnosis unit 15 calculates the relationship between the air pressure required to increase the valve opening and the valve opening (Characteristic I), and the relationship between the air pressure required to decrease the valve opening (Characteristic II), based on the time series data of the opening measurement values and the time series data of the pressure measurement values. The unit calculates the absolute value of the difference between Characteristic I and a predetermined reference (e.g., Characteristic I in a normal state) as the difference on the Characteristic I side, and the absolute value of the difference between Characteristic II and the reference (e.g., Characteristic II in a normal state) as the difference on the Characteristic II side. The difference (absolute value) between the differences on the Characteristic I side and the differences on the Characteristic II side is then calculated as an indicator of the change leading to the occurrence of a failure (step S106). When the calculated index is equal to or greater than a predetermined diagnosis threshold value only in the tension region (low opening region), the malfunction diagnosis unit 15 determines that the bellows seal of the valve may be damaged (step S107 ).

[0085] When applying the technology for detecting valve bellows seal fracture (Japanese Patent No. 7000125) to this embodiment, the failure diagnosis unit 15 uses the pressure difference (maximum friction force) between the air pressure required to increase the valve opening and the air pressure required to decrease the valve opening, calculated based on the time series data of the valve opening measurement values and the time series data of the pressure measurement values, as an indicator of the change until a failure occurs (step S106). If the calculated pressure difference falls below a predetermined diagnostic threshold, the failure diagnosis unit 15 determines that the valve bellows seal may have fractured (step S107).

[0086] The wireless communication unit 17 of each wireless type opening meter 1 wirelessly transmits data including the valve ID stored in the valve ID storage unit 10 of the device, the opening measurement value, the pressure measurement value, the temperature measurement value, the index of the change until the failure occurs, and the failure diagnosis result obtained by the failure diagnosis unit 15 to the valve maintenance support device 3 ( Figure 3 Step S108).

[0087] The wireless communication unit 31 of the valve maintenance support device 3 receives the data ( Figure 3 Step S109).

[0088] The diagnosis result presentation unit 32 of the valve maintenance support device 3 presents the operator with the index of change until the occurrence of the fault and the result of the fault diagnosis ( Figure 3 Step S110).

[0089] Next, the adjustment unit 16 of each wireless type opening meter 1 compares the index of change until the malfunction occurs with a predetermined index judgment threshold value, and if it is determined that the progress of the malfunction of the control valve as the installation destination is small (in Figure 3 In step S111 of the embodiment, if the answer is "YES", at least one of the operation cycle of the malfunction diagnosis unit 15 and the operation cycle (data transmission cycle) of the wireless communication unit 17 is made longer than the initial value, thereby performing the interval extension processing of the operation time of the wireless type aperture meter 1 ( Figure 3 Specifically, the parameter value that specifies the operation cycle of the wireless aperture meter 1 may be automatically adjusted.

[0090] Furthermore, when the adjustment unit 16 determines that the control valve as the installation destination is progressing to a malfunction at a high level ("NO" in step S111), the adjustment unit 16 sets the operation cycle of the malfunction diagnosis unit 15 and the operation cycle of the wireless communication unit 17 to the initial values and stops the operation time interval extension process ( Figure 3 The processing of steps S106 to S113 is performed in each operation cycle of the wireless aperture meter 1.

[0091] In this embodiment, valve stick-slip detection (Patent Document 1) is used as a specific example for further explanation. Simply put, stick-slip is a phenomenon in which rapid acceleration and rapid stop increase during valve operation. Therefore, it can be diagnosed based on data that can be measured only by the opening measurement unit 11, such as the breakdown of the balance between the detected average speed and maximum speed, or the breakdown of the balance between the speed and acceleration distribution. Figure 4 The situation shown here corresponds to a breakdown in the balance of the velocity and acceleration distribution. Here, the valve opening movement (equivalent to velocity information) every 40 milliseconds is defined as one sample over 400 seconds (the diagnostic target period). The mean squared value and average value of each sample are used as indicators of changes leading to the occurrence of a failure.

[0092] Figure 5 This is a characteristic diagram showing the measurement results when valve stick-slip does not occur in the prior art. Figure 6 This is a characteristic diagram showing the measurement results when valve stick-slip occurs. In the technology disclosed in Patent Document 1, the ratio Aτ (= mean square value / mean value) of the average value to the mean square value is calculated, and the difference Aτ-A between this ratio Aτ and the ratio A in the normal state is compared with a predetermined diagnostic threshold value to detect stick-slip. Figure 5 In the example, the solid line 50 represents the ratio A in the normal state, the difference between the ratio Aτ represented by the black circle and the solid line 50 is Aτ-A, and the difference between the dotted line 51 and the solid line 50 is the diagnosis threshold.

[0093] In the technology disclosed in Patent Document 1, only the diagnostic threshold is set, so data collection is performed at a predetermined operating frequency. Figure 7 In this way, the operating cycle is fixed to calculate indicators and diagnose faults every 400 seconds.

[0094] Figure 8 is a characteristic diagram showing the measurement results when valve stick-slip does not occur in this embodiment. Figure 9 This is a characteristic diagram showing the measurement results when valve stick-slip occurs. Figure 8 、 Figure 9 In the embodiment, the difference between the dotted line 52 and the solid line 50 becomes the index judgment threshold. In the present embodiment, when the index (difference Aτ-A) is below the index judgment threshold, the operating frequency of the wireless aperture meter 1 is reduced to reduce the consumption of the battery 19. Figure 8 、 Figure 9In the example, the ratio of the black and white dots is Aτ, and the white dots in the example show the value of the interval extended by this embodiment. As an example of reducing the operating frequency, it can be considered that when the indicator exceeds the indicator judgment threshold, Figure 7 As shown, the index is calculated and the fault diagnosis is performed every 400 seconds. When the index is below the index judgment threshold, for example, Figure 10 As shown, the index is calculated and the fault diagnosis is performed every 800 seconds.

[0095] While the above example uses stick-slip as an example, when simultaneously monitoring multiple failure conditions, such as stick-slip, degradation of V-gaskets, degradation of the actuator diaphragm, degradation of the valve body diaphragm, degradation of components due to thermal cycling, and breakage / rupture of bellows seals, it is preferable to pre-set indicator thresholds corresponding to each failure type so that the period from when the interval extension process is stopped by comparing the indicator with the threshold until the failure is detected is the same for each failure type. This period can be estimated statistically based on data related to past failure occurrences. Alternatively, if no historical data is available, the threshold can be temporarily set at the initial stage of valve operation and then adjusted appropriately by monitoring the initial development of abnormality signs.

[0096] When the technology for detecting deterioration of the V-shaped gasket of the valve (Japanese Patent Gazette No. 6851938) is applied to the present embodiment, when at least one of the situations occurs in which the speed index is less than the prescribed speed index judgment threshold (speed index judgment threshold < speed threshold) or the friction index exceeds the prescribed friction index judgment threshold (friction index judgment threshold > friction threshold), the adjustment unit 16 performs an interval extension process for the operating time.

[0097] When the technology for detecting the deterioration of the diaphragm of the valve operator (Japanese Patent Gazette No. 6978252) is applied to this embodiment, when the indicator (the product of the operating volume and the pressure) is within a range below the specified indicator judgment threshold (indicator judgment threshold < diagnosis threshold), the adjustment unit 16 performs an interval extension process for the operating time.

[0098] When the technology for detecting the deterioration (hardening) of the diaphragm of the valve body (Japanese Patent Gazette No. 6981815) is applied to the present embodiment, when the indicator (the amount of intrusion of the valve body in the closing direction) is above the specified indicator judgment threshold (indicator judgment threshold > diagnosis threshold), the operating time interval is extended.

[0099] When the technology for detecting the deterioration of parts caused by thermal cycles of valves (for example, loosening of the valve seat ring) (Japanese Patent Gazette No. 6981816) is applied to the present embodiment, when the indicator (the product of the temperature difference and the number of cycles) is within a range below the prescribed indicator judgment threshold (indicator judgment threshold < diagnosis threshold), the adjustment unit 16 performs an interval extension process for the operating time.

[0100] When the technology for detecting damage to the bellows seal of the valve (Japanese Patent Gazette No. 7000123) is applied to the present embodiment, when the indicator (the difference between the difference on the characteristic I side and the difference on the characteristic II side) is within a range below the prescribed indicator judgment threshold (indicator judgment threshold < diagnosis threshold), the adjustment unit 16 performs an interval extension process for the operating time.

[0101] When the technology for detecting the fracture of the bellows seal of the valve (Japanese Patent Gazette No. 7000125) is applied to the present embodiment, when the indicator (pressure difference) is above the specified indicator judgment threshold (indicator judgment threshold > diagnosis threshold), the adjustment unit 16 performs an interval extension process for the operating time.

[0102] When simultaneously monitoring the progress of multiple types of failures, if all failures of the same control valve are judged to be of low progression, the adjustment unit 16 determines that the interval extension of the operating time of the wireless position meter 1 installed in the control valve should be performed. Alternatively, if at least one failure of the same control valve is judged to be of high progression, the adjustment unit 16 determines that the interval extension of the operating time of the wireless position meter 1 installed in the control valve should be terminated.

[0103] As described above, in this embodiment, the operating time of the wireless aperture meter 1 is appropriately extended at intervals according to the degree of progress of the control valve toward malfunction, thereby reducing battery consumption.

[0104] Furthermore, in this embodiment, the valve ID, measured values, indicators, and failure diagnosis results are transmitted to the valve maintenance support device 3. However, in addition to these, information on the operating cycle of the wireless position meter 1 may also be transmitted to the valve maintenance support device 3. This allows the operator of the valve maintenance support device 3 to recognize whether the interval extension process for the operating time of the wireless position meter 1 has been stopped.

[0105] [Second embodiment]

[0106] Next, a second embodiment of the present invention will be described. Figure 11This is a block diagram showing the configuration of a wireless valve opening meter 1a in the valve maintenance support system of this embodiment. The wireless valve opening meter 1a includes a valve ID storage unit 10, an opening measurement unit 11, a pressure measurement unit 12, a temperature measurement unit 13, a storage unit 14, a wireless communication unit 17a, a control unit 18a, and a battery 19.

[0107] Figure 12 This is a block diagram showing the structure of a valve maintenance support device 3a of the valve maintenance support system of this embodiment. The valve maintenance support device 3a includes a valve ID storage unit 30, a wireless communication unit 31a, a diagnosis result presentation unit 32a, a storage unit 33, a failure diagnosis unit 34, and an adjustment unit 35.

[0108] In the first embodiment, the malfunction diagnosis unit 15 and adjustment unit 16 are installed in the wireless valve opening meter 1. However, to reduce battery consumption, it is preferable to install components or processes that do not need to be installed in the wireless valve opening meter externally. Therefore, in this embodiment, the malfunction diagnosis unit 34 and adjustment unit 35 are installed in the valve maintenance support device 3a.

[0109] Figure 13 This is a flowchart illustrating the operation of the valve maintenance support system of this embodiment. Figure 13 The processing of steps S100 to S105 is the same as that described in the first embodiment.

[0110] The wireless communication unit 17a of each wireless type opening meter 1a wirelessly transmits data including the valve ID, opening measurement value, pressure measurement value and temperature measurement value stored in the valve ID storage unit 10 of the device to the valve maintenance support device 3a ( Figure 13 As described above, the opening measurement value, the pressure measurement value, and the temperature measurement value are each supplemented with time information.

[0111] The wireless communication unit 31a of the valve maintenance support device 3a receives data transmitted from each wireless type opening meter 1a ( Figure 13 The data received by the wireless communication unit 31a is stored in the storage unit 33 ( Figure 13 Step S116).

[0112] The failure diagnosis unit 34 of the valve maintenance support device 3a calculates an index ( ) of changes in the control valve until a failure occurs based on at least one of the time series data of the opening measurement value, the time series data of the pressure measurement value, and the time series data of the temperature measurement value for each valve ID stored in the valve ID storage unit 30 of the device (each valve ID included in the received data). Figure 13 Step S117), based on the index, the fault diagnosis of the control valve is performed for each valve ID ( Figure 13 The method of calculating the index and the method of diagnosing the fault are the same as those in the first embodiment.

[0113] The diagnosis result presenting unit 32a of the valve maintenance support device 3a presents the operator with the index of change until the failure occurs and the result of the failure diagnosis ( Figure 13 Step S119).

[0114] Next, the adjustment unit 35 of the valve maintenance support device 3a compares the index of change until the occurrence of the malfunction with the predetermined index judgment threshold value, and determines whether the degree of progress toward the malfunction of the control valve is small (or small) for each valve ID stored in the valve ID storage unit 30 (each valve ID included in the received data), similarly to the adjustment unit 16 of the first embodiment. Figure 13 Step S120).

[0115] If the adjustment unit 35 determines that the control valve is progressing toward a malfunction at a low level, it determines that the operation time of the wireless valve gauge 1a should be extended, and generates a command to set the operation cycle of the wireless valve gauge 1a to a value longer than the initial value. If the adjustment unit 35 determines that the control valve is progressing toward a malfunction at a high level, it determines that the interval extension process for the operation time of the wireless valve gauge 1a should be terminated, and generates a command to set the operation cycle of the wireless valve gauge 1a to the initial value.

[0116] If there is a wireless opening meter 1a that has been determined by the adjustment unit 35 to be subject to the operation time interval extension process, the wireless communication unit 31a of the valve maintenance support device 3a wirelessly transmits a command to the wireless opening meter 1a to set the operation cycle to a value longer than the initial value ( Figure 13 In addition, when there is a wireless type aperture meter 1a for which the adjustment unit 35 has determined that the operation time interval extension process should be completed, the wireless communication unit 31a wirelessly transmits a command to set the operation cycle to the initial value to the wireless aperture meter 1a ( Figure 13 Step S122).

[0117] The wireless communication unit 17a of each wireless type opening meter 1a receives the command sent from the valve maintenance support device 3a ( Figure 13 Step S123).

[0118] The control unit 18a of each wireless type aperture meter 1a sets the operation cycle of the device (in this embodiment, the data transmission cycle of the wireless communication unit 17a) according to the command received by the wireless communication unit 17a of the device. Figure 13The processing of steps S114 to S124 is performed every operation cycle of the wireless aperture meter 1a.

[0119] In this manner, this embodiment achieves the same effects as the first embodiment. The indicator judgment thresholds for simultaneously monitoring the progress of multiple types of failures can be set similarly to the first embodiment. As in the first embodiment, when simultaneously monitoring the progress of multiple types of failures, if all failures of the same control valve are judged to be of low progression, the adjustment unit 35 determines that the operating time interval of the wireless valve opening meter 1a installed in the control valve should be extended. Furthermore, if at least one failure of the same control valve is judged to be of high progression, the adjustment unit 35 determines that the operating time interval extension of the wireless valve opening meter 1a installed in the control valve should be terminated.

[0120] The valve ID storage unit 10, storage unit 14, fault diagnosis unit 15, adjustment unit 16, wireless communication unit 17, wireless communication unit 17a, and control unit 18, control unit 18a of the wireless opening meter 1 and the wireless opening meter 1a described in the first and second embodiments can be implemented by a computer including a central processing unit (CPU), a storage device and an interface, and a program for controlling these hardware resources. Similarly, the valve maintenance support device 3 and the valve maintenance support device 3a can be implemented by a computer. The structure of these computers is shown in FIG. Figure 14 middle.

[0121] The computer includes a CPU 300, a storage device 301, and an interface device (abbreviated as I / F) 302. In the case of the wireless opening meter 1 or wireless opening meter 1a, the opening measurement unit 11, pressure measurement unit 12, temperature measurement unit 13, and the hardware of the wireless communication unit 17 or wireless communication unit 17a are connected to the I / F 302. In the case of the valve maintenance support device 3 or valve maintenance support device 3a, the hardware of the wireless communication unit 31 or wireless communication unit 31a, a display device, and the like are connected to the I / F 302. In this computer, a program for implementing the valve maintenance support method of the present invention is stored in the storage device 301. The CPU 300 of each device executes the processing described in the first and second embodiments according to the program stored in the storage device 301 of the device.

[0122] [Industrial Applicability]

[0123] The present invention can be applied to technology supporting valve maintenance work.

Claims

1. A wireless valve gauge, which is a battery-driven wireless valve gauge installed in a control valve, characterized in that: include: a measuring unit configured to measure at least one of an opening of the control valve, an air pressure supplied to an operator of the control valve, and a temperature on an outlet side of the control valve; a malfunction diagnosis unit configured to calculate an index of changes in the control valve until a malfunction occurs based on the measurement value obtained by the measurement unit, and to perform malfunction diagnosis of the control valve based on the index; a wireless communication unit configured to wirelessly transmit the indicator and the result of the failure diagnosis to a valve maintenance support device; as well as The adjustment unit is configured to compare the indicator with a prescribed indicator judgment threshold value, and when it is determined that the degree of progress of the control valve toward an abnormal condition is small, make the operation cycle of the wireless aperture meter longer than an initial value, thereby performing an interval extension process for the operation time of the wireless aperture meter; when it is determined that the degree of progress is large, set the operation cycle to the initial value and stop the interval extension process.

2. The wireless actuation meter according to claim 1, wherein: The failure of the control valve that is the subject of the failure diagnosis is a failure that is unique to the control valve and gradually develops.

3. The wireless actuation meter according to claim 1, wherein: When simultaneously observing the process of multiple types of faulty conditions of the control valve, each of the indicator judgment thresholds corresponding to the multiple types of faulty conditions is pre-set so that for the multiple types of faulty conditions, the period from when the interval extension processing is stopped by comparing the indicator with the indicator judgment threshold until the faulty condition is detected is the same.

4. A valve maintenance support system, characterized in that: include: Wireless opening gauge, which is a battery-driven type installed in the control valve; as well as Valve maintenance support device, The wireless type actuation meter comprises: a measuring unit configured to measure at least one of an opening of the control valve, an air pressure supplied to an operator of the control valve, and a temperature on an outlet side of the control valve; a malfunction diagnosis unit configured to calculate an index of changes in the control valve until a malfunction occurs based on the measurement value obtained by the measurement unit, and to perform malfunction diagnosis of the control valve based on the index; a first wireless communication unit configured to wirelessly transmit the indicator and the result of the failure diagnosis to the valve maintenance support device; and The adjustment unit is configured to compare the index with a predetermined index judgment threshold value, and when it is determined that the degree of progress of the control valve toward a malfunction is small, extend the operation cycle of the wireless aperture meter by making it longer than an initial value, thereby performing an interval extension process for the operation time of the wireless aperture meter; and when it is determined that the degree of progress is large, set the operation cycle to the initial value and stop the interval extension process. The valve maintenance support device includes: a second wireless communication unit configured to receive the index and the result of the failure diagnosis transmitted from the wireless aperture meter; and The diagnosis result presenting unit is configured to present the indicator and the result of the failure diagnosis received by the second wireless communication unit.

5. A valve maintenance support system, characterized in that: include: Wireless opening gauge, which is a battery-driven type installed in the control valve; as well as Valve maintenance support device, The wireless type actuation meter comprises: a measuring unit configured to measure at least one of an opening of the control valve, an air pressure supplied to an operator of the control valve, and a temperature on an outlet side of the control valve; a first wireless communication unit configured to wirelessly transmit a measurement value obtained by the measurement unit to the valve maintenance support device and to receive a command wirelessly transmitted from the valve maintenance support device; and The control unit is configured to set the operation cycle of the wireless actuation meter according to the command. The valve maintenance support device includes: a second wireless communication unit configured to receive the measurement value transmitted from the wireless aperture meter; a malfunction diagnosis unit configured to calculate an index of changes in the control valve until a malfunction occurs based on the measurement value received by the second wireless communication unit, and to perform malfunction diagnosis of the control valve based on the index; a diagnosis result presenting unit configured to present the indicator and the result of the malfunction diagnosis; and The adjustment unit is configured to compare the index with a predetermined index judgment threshold value, and when it is determined that the progress of the control valve toward a fault condition is small, generate a command to set the operation cycle of the wireless type aperture meter to a value longer than an initial value, thereby performing an interval extension process for the operation time of the wireless type aperture meter; and when it is determined that the progress is large, generate a command to set the operation cycle to the initial value, thereby stopping the interval extension process. The second wireless communication unit wirelessly transmits the command generated by the adjustment unit to the wireless aperture meter.

6. The valve maintenance support system according to claim 4 or 5, characterized in that: The failure of the control valve that is the subject of the failure diagnosis is a failure that is unique to the control valve and gradually develops.

7. The valve maintenance support system according to claim 4 or 5, characterized in that: When simultaneously observing the process of multiple types of faulty conditions of the control valve, each of the indicator judgment thresholds corresponding to the multiple types of faulty conditions is pre-set so that for the multiple types of faulty conditions, the period from when the interval extension processing is stopped by comparing the indicator with the indicator judgment threshold until the faulty condition is detected is the same.

8. The valve maintenance support system according to claim 6, characterized in that: The fault condition of the control valve that is the subject of the fault diagnosis is at least one of stick-slip, deterioration of the V-shaped gasket, deterioration of the diaphragm of the operator, deterioration of the diaphragm of the valve body, deterioration of parts caused by thermal cycling, damage to the bellows seal, and rupture of the bellows seal.

9. A valve maintenance support method, characterized in that: include: In a first step, a battery-driven wireless opening meter installed in the control valve measures at least one of the opening of the control valve, the air pressure supplied to the operator of the control valve, and the temperature on the outlet side of the control valve; In a second step, the wireless opening meter calculates an index of change until a malfunction occurs in the control valve based on the measurement value obtained in the first step; In a third step, the wireless valve opening meter performs a fault diagnosis of the control valve based on the indicator; In a fourth step, the wireless valve opening meter wirelessly transmits the indicator and the result of the fault diagnosis to a valve maintenance support device; In a fifth step, the wireless valve opening meter compares the indicator with a predetermined indicator judgment threshold value, and if it is determined that the control valve is progressing toward a malfunction, the operation cycle of the wireless valve opening meter is extended compared to an initial value, thereby performing an operation time interval extension process; as well as In a sixth step, the wireless aperture meter compares the index with the index determination threshold value, and when it is determined that the progress degree is large, sets the operation cycle to the initial value and stops the interval extension process.

10. A valve maintenance support method, characterized in that: include: In a first step, a battery-driven wireless opening meter installed in the control valve measures at least one of the opening of the control valve, the air pressure supplied to the operator of the control valve, and the temperature on the outlet side of the control valve; In a second step, the wireless valve opening meter calculates an index of change until a malfunction occurs in the control valve based on the measurement value obtained in the first step; In a third step, the wireless valve opening meter performs a fault diagnosis of the control valve based on the indicator; In a fourth step, the wireless valve opening meter wirelessly transmits the indicator and the result of the fault diagnosis to a valve maintenance support device; In a fifth step, the valve maintenance support device receives the indicator and the result of the fault diagnosis transmitted from the wireless valve opening meter; In a sixth step, the valve maintenance support device displays the indicator received in the fifth step and the result of the fault diagnosis; In a seventh step, the wireless valve opening meter compares the indicator with a predetermined indicator judgment threshold value, and if it is determined that the control valve is progressing toward a malfunction, the operation cycle of the wireless valve opening meter is extended compared to an initial value, thereby performing an operation time interval extension process; as well as In an eighth step, the wireless aperture meter compares the index with the index determination threshold value, and when it is determined that the progress degree is large, sets the operation cycle to the initial value and stops the interval extension process.

11. A valve maintenance support method, characterized in that: include: In a first step, a battery-driven wireless opening meter installed in the control valve measures at least one of the opening of the control valve, the air pressure supplied to the operator of the control valve, and the temperature on the outlet side of the control valve; In a second step, the wireless opening meter wirelessly transmits the measurement value obtained in the first step to a valve maintenance support device; In a third step, the valve maintenance support device receives the measurement value transmitted from the wireless valve opening meter; In a fourth step, the valve maintenance support device calculates an index of change until a malfunction occurs in the control valve based on the measurement value received in the third step; In a fifth step, the valve maintenance support device performs a fault diagnosis of the control valve based on the indicator; In a sixth step, the valve maintenance support device displays the indicator and the result of the fault diagnosis; In a seventh step, the valve maintenance support device compares the indicator with a predetermined indicator judgment threshold value and, if it is determined that the control valve is progressing toward a malfunction, generates a command to set the operation cycle of the wireless valve opening meter to a value longer than an initial value, thereby extending the interval of the operation time of the wireless valve opening meter. In an eighth step, the valve maintenance support device compares the indicator with the indicator judgment threshold value and, if it is determined that the progress is large, generates a command to set the operation cycle to the initial value, thereby stopping the interval extension process; In a ninth step, the valve maintenance support device wirelessly transmits the command generated in the seventh step or the eighth step to the wireless valve opening meter; In the tenth step, the wireless actuation meter receives the command; as well as In an eleventh step, the wireless type aperture meter sets an operation cycle of the wireless type aperture meter according to the command received in the tenth step.

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