JP6818200B2 - Abnormal part detection device of control valve system - Google Patents

Description

The present invention does not require an improvement of the control valve system, more specifically, an overhaul in a periodic inspection, and by skillfully synthesizing calculated values calculated based on measured values at the same time point on the same graph plane. The present invention relates to an abnormal part detection device of a control valve system that can plot and display the state change of the above in multiple directions and can detect an abnormal part with high accuracy visually and intuitively.

In the control valve system of equipment in various plants, it is necessary to carry out regular inspections to ensure safety, and in order to detect abnormalities in equipment, overhaul (disassemble) the equipment and carry out inspections. Often.

However, overhaul not only imposes a heavy workload, but if a normal control valve is overhauled, human error may occur during assembly, which may lead to an abnormality. There was also the problem that it would cost a lot.

Conventionally, for the purpose of reducing the burden of periodic inspection of such a plant, a valve that diagnoses an abnormality of a valve by focusing on the dynamic characteristics of the valve has been disclosed (see, for example, Patent Document 1).

However, in this diagnostic device, when comparing the analysis result and the test result, the display with the X-axis as the time axis is exemplified, but in this case, the transition in the X-axis direction is unidirectional because it is just the passage of time. Since it is a target, the only visible change is the numerical fluctuation in the Y-axis direction (vertical movement of the amplitude), and it appears only in a simple waveform. Therefore, in order to evaluate the abnormal state with such a small displacement difference, experience and skill are inevitably required, and although the presence or absence of the abnormality can be detected, the accuracy of detecting the abnormal part is sufficient. I can't say that.

Japanese Unexamined Patent Publication No. 7-159285

The present invention has been made in view of the above-mentioned problems in the conventional control valve system, and an object of the present invention is that overhaul in periodic inspection is unnecessary and measured values at the same time point. By skillfully synthesizing the calculated values calculated based on the above on the same graph plane, the state change of the device can be plotted and displayed in multiple directions, and the abnormal part can be visually and intuitively displayed with high accuracy. An object of the present invention is to provide an abnormality site detection device for a control valve system that can detect an abnormality.

The means adopted by the present inventor to solve the above technical problems will be described as follows with reference to the accompanying drawings.

That is, the present invention is an abnormality site detection device of a control valve system capable of controlling a flow rate or pressure by a fluid pressure type positioner.
The valve drive unit has a positioner output flow rate sensor that can measure the fluid flow rate output from the positioner to the control valve through piping.
An input pressure sensor that can measure the pressure input to the positioner according to the input signal of a predetermined waveform given periodically, and
A positioner supply flow rate sensor that can measure the fluid flow rate supplied to the positioner, and
A valve pressure sensor that can measure the valve pressure of the control valve and
At least a plurality of valve opening sensors capable of measuring the valve opening of the control valve are arranged.
In addition to making it possible to acquire the measured values of each of the sensors at a predetermined time point,
The first calculated value and the second calculated value are calculated based on the singular or multiple measured values at the same time point.
The first calculated value and the second calculated value at each measurement time within a predetermined period can be plotted and displayed on the XY-axis graph plane having each as the graph axis.
The abnormal part of the control valve system can be detected according to the difference pattern of the distribution characteristics between this plot display and the normal plot display obtained in advance .
The first calculated value is calculated from the measured value of the positioner output flow rate sensor and the measured value of the valve pressure sensor, and is also calculated.
By calculating the rate of change of the second calculated value from the measured value of the valve opening sensor,
By adopting the technical means of making it possible to detect the abnormality of the valve body, the abnormality part detection device of the control valve system was completed.

Further, the present invention is an abnormality site detection device of a control valve system capable of controlling a flow rate or pressure by a fluid pressure type positioner.
The valve drive unit has a positioner output flow rate sensor that can measure the fluid flow rate output from the positioner to the control valve through piping.
An input pressure sensor that can measure the pressure input to the positioner according to the input signal of a predetermined waveform given periodically, and
A positioner supply flow rate sensor that can measure the fluid flow rate supplied to the positioner, and
A valve pressure sensor that can measure the valve pressure of the control valve and
At least a plurality of valve opening sensors capable of measuring the valve opening of the control valve are arranged.
In addition to making it possible to acquire the measured values of each of the sensors at a predetermined time point,
The first calculated value and the second calculated value are calculated based on the singular or multiple measured values at the same time point.
The first calculated value and the second calculated value at each measurement time within a predetermined period can be plotted and displayed on the XY-axis graph plane having each as the graph axis.
The abnormal part of the control valve system can be detected according to the difference pattern of the distribution characteristics between this plot display and the normal plot display obtained in advance.
The first calculated value is the rate of change as a deviation between the measured value of the input pressure sensor and the measured value of the valve opening sensor.
By calculating the second calculated value from the measured value of the positioner output flow rate sensor and the measured value of the valve pressure sensor,
It is also possible to adopt a technical means of making the positioner's own anomaly detectable.

Furthermore, the present invention is an abnormality site detection device of a control valve system capable of controlling a flow rate or pressure by a fluid pressure type positioner.
The valve drive unit has a positioner output flow rate sensor that can measure the fluid flow rate output from the positioner to the control valve through piping.
An input pressure sensor that can measure the pressure input to the positioner according to the input signal of a predetermined waveform given periodically, and
A positioner supply flow rate sensor that can measure the fluid flow rate supplied to the positioner, and
A valve pressure sensor that can measure the valve pressure of the control valve and
At least a plurality of valve opening sensors capable of measuring the valve opening of the control valve are arranged.
In addition to making it possible to acquire the measured values of each of the sensors at a predetermined time point,
The first calculated value and the second calculated value are calculated based on the singular or multiple measured values at the same time point.
The first calculated value and the second calculated value at each measurement time within a predetermined period can be plotted and displayed on the XY-axis graph plane having each as the graph axis.
The abnormal part of the control valve system can be detected according to the difference pattern of the distribution characteristics between this plot display and the normal plot display obtained in advance.
While providing multiple Y-axis so that each XY-axis plot display can be superimposed and displayed,
The first calculated value is calculated from the measured value of the positioner output flow rate sensor, and
The second calculated value is calculated from the measured value of the positioner supply flow rate sensor and calculated from the measured value of the valve pressure sensor.
By superimposing each XY-axis plot display,
It is also possible to adopt a technical means of making the positioner's own anomaly detectable.

Further, in order to solve the above-mentioned problems, in addition to the above-mentioned means, the present invention uses a positioner output flow rate sensor as a flow meter arranged in a pipe.
The technical means of making the flow rate directly measurable can be adopted.

Furthermore, in order to solve the above problems, in addition to the above means, the present invention uses a positioner output flow rate sensor as a pressure gauge arranged outside the pipe.
Adopt a technical means of measuring the diaphragm chamber volume from the valve opening sensor and using the measured value of the valve pressure by the pressure gauge to obtain the measured value of the positioner output flow rate by conversion by the equation of state. Can be done.

According to the abnormality site detection device of the control valve system of the present invention, the state change of the device can be changed in multiple directions by skillfully synthesizing the calculated values calculated based on the measured values at the same time point on the same graph plane. Since the plot can be displayed, the abnormal part can be detected with high accuracy visually and intuitively.

Further, since the abnormal state can be detected only by the measurement of the sensor, the overhaul in the periodic inspection becomes unnecessary, so that the work load can be reduced and the cost can be reduced.

Furthermore, regarding the maintenance of equipment, time-based maintenance (TBM: Time Based Maintenance) has been conventionally performed, but by applying the technique of the present invention, it has been shifted to state-based maintenance (CBM: Condition Based Maintenance). Can contribute to the development of the industry.

It is the schematic which shows the structure of the abnormality part detection apparatus of the control valve system of embodiment of this invention. It is explanatory drawing which shows the abnormality part detection apparatus of Example 1 of this invention. It is a plot display at the time of normal of Example 1 of this invention. It is a plot display at the time of normal of Example 1 of this invention. It is a plot display at the time of abnormality of Example 1 of this invention. It is a plot display at the time of abnormality of Example 1 of this invention. It is a comparative example of the plot display at the time of abnormality of Example 1 of this invention. It is a comparative example of the plot display at the time of abnormality of Example 1 of this invention. It is explanatory drawing which shows the abnormality part detection apparatus of Example 2 of this invention. It is a plot display at the time of normal of Example 2 of this invention. It is a plot display at the time of abnormality of Example 2 of this invention. It is a plot display at the time of abnormality of Example 2 of this invention. It is a comparative example of the plot display at the time of abnormality of Example 2 of this invention. It is a comparative example of the plot display at the time of abnormality of Example 2 of this invention. It is a comparative example of the plot display at the time of abnormality of Example 2 of this invention. It is explanatory drawing which shows the abnormality part detection apparatus of Example 3 of this invention. It is a plot display at the time of normal of Example 3 of this invention. It is a plot display at the time of abnormality of Example 3 of this invention. It is a plot display at the time of abnormality of Example 3 of this invention. It is a comparative example of the plot display at the time of abnormality of Example 3 of this invention.

Embodiments of the present invention will be described with reference to FIGS. 1 to 20. In the figure, what is indicated by reference numeral 1 is a positioner output flow rate sensor, and the positioner output flow rate sensor 1 can measure the fluid flow rate output from the positioner P to the control valve B through the pipe.

Furthermore, what is indicated by reference numeral 2 is an input pressure sensor, and the input pressure sensor 2 can measure the pressure input to the positioner P in response to an input signal having a predetermined waveform given periodically. Specifically, it measures what is converted into the fluid pressure for operating the pilot internal valve by the input signal.

Furthermore, what is indicated by reference numeral 3 is a positioner supply flow rate sensor, and the positioner supply flow rate sensor 3 can measure the fluid flow rate supplied to the positioner P.

Furthermore, what is indicated by reference numeral 4 is a valve pressure sensor, and the valve pressure sensor 4 can measure the valve pressure of the control valve B.

Furthermore, what is indicated by reference numeral 5 is a valve opening degree sensor, and the valve opening degree sensor 5 can measure the valve opening degree of the control valve B.

First, the configuration of the control valve system of the present embodiment will be described (see FIG. 1). The control valve system of the present embodiment controls the flow rate of the fluid or pressure to be controlled by the fluid pressure type positioner P (within the range of the broken line in the figure).

Further, in the present embodiment, a pneumatic type fluid can be adopted as the fluid used for the fluid pressure type positioner P. Gas is easier to handle than hydraulic liquid because there is no risk of liquid leakage.

The structure of the positioner P is generally known, but when pressure is input by an input signal, the fluid is supplied to the inside of the main body to move the pilot internal valve, and the operation of the pilot internal valve causes piping. The control valve B can be driven by the fluid output through the pipe to control the opening and closing. The valve opening degree of the control valve is appropriately fed back to the control mechanism through the displacement sensor.

Next, the configuration of the abnormality site detection device of this control valve system will be described. First, the positioner output flow rate sensor 1 capable of measuring the fluid flow rate output from the positioner P to the control valve B through the pipe can be arranged. Specifically, the fluid output by the operation of the pilot inner valve flows and is arranged in the pipe communicating with the control valve B.

In the present embodiment, as the positioner output flow rate sensor 1, a flow meter capable of directly measuring the flow rate arranged in the pipe can be adopted. By adopting a flow meter, the waveform of the positioner output flow rate responds in a differentiated form of the same pressure change, so even minute changes can be reliably captured, and extremely high detection capability is obtained compared to pressure meters. be able to.

Especially in the case of a diaphragm type control valve, the positioner output flow rate sensor 1 is used as a pressure gauge arranged outside the pipe, and the diaphragm chamber volume is measured from the valve opening sensor 5 and the valve pressure is measured. The measured value can also be used as the measured value of the positioner output flow rate by conversion by the equation of state. By doing so, it is not necessary to insert the flow rate sensor in the middle of the pipe, and it is possible to prevent the instrument itself from becoming a resistance of the fluid.

In this control valve system, at least a plurality of sensors of the positioner output flow rate sensor 1, the input pressure sensor 2, the positioner supply flow rate sensor 3, the valve pressure sensor 4, and the valve opening sensor 5 are arranged. ..

Specifically, the input pressure sensor 2 is arranged in a pipe through which the fluid of the control mechanism of the positioner P flows. Further, the positioner supply flow rate sensor 3 communicates with the positioner P and is arranged in a pipe through which a fluid supplied to the pilot flows.

Then, the valve pressure sensor 4 is arranged in a pipe through which the fluid output by the operation of the pilot inner valve flows and communicates with the control valve B, similarly to the positioner output flow rate sensor 1. Further, the valve opening degree sensor 5 is arranged in a movable portion of the control valve.

Then, the measured values of the respective sensors at a predetermined time point can be acquired, and the first calculated value and the second calculated value are calculated based on the single or a plurality of the measured values at the same time point. At this time, when the measured value is singular, the measured value and the calculated value are the same value.

Next, the first calculated value and the second calculated value at each measurement time within a predetermined cycle can be plotted and displayed on the XY-axis graph plane having each as the graph axis. In this embodiment, the XY axes are orthogonal.

After that, the abnormal part of the control valve system can be detected according to the difference pattern of the distribution characteristics between this plot display and the normal plot display obtained in advance. This normal plot display can be stored in a database in advance on a recording medium or the like, and can be easily compared to determine an abnormality due to a difference in distribution characteristics.

Examples of the present invention are shown below. The data obtained in the examples show the behavior of the control valve in a state where an abnormality is intentionally given to a specific location. As the positioner P of Examples 1 to 3, Mason Naran 7400 type (driving unit: Mason Naran 82-21914) is used. Further, in Examples 1 and 2, the signal pattern of the input signal of the positioner P is a lamp wave having a 1-minute cycle (a lamp wave having an amplitude of 40 to 60% and a cycle of 1 minute is used for 2 cycles), and the response is plotted. In Example 3, UPDN (up / down) waves (40 → 45%, 45 → 40% ramp-like changes in two cycles at regular intervals) are used, and the response is plotted.

<Example 1>
In this embodiment, the abnormal part detection device shown in FIG. 2 is used, and the first calculated value is calculated from at least one of the measured value of the positioner output flow rate sensor 1 and the measured value of the valve pressure sensor 4, and is the second. (Ii) The calculated value is the change speed calculated from the measured value of the valve opening sensor 5. That is, since the relationship between the positioner output flow rate and the valve opening degree is affected by the abnormality mode of the valve body, the abnormality of the valve body can be detected. The positioner output flow rate and valve opening can be measured using the following sensors.
-Positioner output flow rate: Positioner output flow rate sensor 1, valve pressure sensor 4
-Valve opening: Valve opening sensor 5

In this embodiment, the first calculated value (positioner output flow rate) is plotted on the X-axis graph plane and the second calculated value (change speed of valve opening) is plotted on the XY-axis graph plane with the Y-axis as the graph axis. At this time, the unit of the positioner output flow rate is [NL (normal liter: standard state (temperature 20 ° C., atmospheric pressure 1013 hPa, relative humidity 65%)) / min], and the unit of the valve opening change rate is [% / sec]. In this way, the greatest feature of the present invention is that the calculated values (variables) of units (dimensions) different from each other are displayed on the same plane.

Further, in this embodiment, the plot distribution has the following characteristics depending on the operating state of the control valve B. (1) to (3) are the numbers 1 to 3 in the circled numbers (hereinafter, simply referred to as "1") in the figure. In addition, the plot is reversed left and right for the forward operating valve.
(1) The positioner output flow rate increases until the valve starts to move.
(2) When the valve starts to move, it moves a little faster. Then, the positioner output flow rate is delayed and decreases, and the valve speed becomes slow.
(3) The valve moves while maintaining the speed.

The process of abnormality detection in this embodiment will be described. In this embodiment, the abnormal mode is determined by the change in the plot characteristics with respect to the normal state. First, FIGS. 3 and 4 show the plot display in the normal state. With the passage of time, the circled numbers 1 to 3 are plotted along the direction of the arrow. In the normal plot shape, when focusing on the first size (lengths of a and b), almost a = b (see FIG. 4).

Next, as an abnormal mode caused by the positioner P, a plot display when a foreign matter adheres to the pilot inner valve is shown in FIG. In this case, paying attention to the first size (lengths of a and b in FIGS. 4 and 5), since a = b, the plot does not change much and an abnormality is detected. It can be said that it is difficult.

On the other hand, FIG. 6 shows a plot display when the gland packing is retightened as an abnormal mode caused by the drive unit / inner valve. In this case, paying attention to the first size (the lengths of a and b in FIGS. 4 and 6) and the second size, the plot becomes large although the shape is almost a = b. Therefore, the abnormal site can be detected from the difference pattern of such distribution features.

Further, FIG. 7 shows a plot display when the inner valve stem is eccentric as an abnormal mode caused by the drive unit / inner valve. In this case, paying attention to No. 3 (and the circled portion in the figure), the plot spreads to the left and right, and No. 1 also becomes larger. Therefore, the abnormal site can be detected from the difference pattern of such distribution features.

Further, FIG. 8 shows a plot display when the guide portion of the plug is scratched as an abnormal mode caused by the drive unit / internal valve. In this case, paying attention to the first size (lengths of a and b in FIG. 8), a ≠ b, and the plots in the open direction (right side) and the closed direction (left side) are asymmetric. Therefore, the abnormal site can be detected from the difference pattern of such distribution features.

<Example 2>
In this embodiment, the abnormality portion detection device shown in FIG. 9 is used to calculate the rate of change of the deviation between the first calculated value and the measured value of the input pressure sensor 2 and the measured value of the valve opening sensor 5. At the same time, the second calculated value is calculated from at least one of the measured value of the positioner output flow rate sensor 1 and the measured value of the valve pressure sensor 4. That is, since the positioner output flow rate is controlled so as to cancel the deviation between the input signal and the valve opening degree, the abnormality of the positioner P itself can be detected. The deviation between the input signal and the valve opening and the positioner output flow rate can be measured using the following sensors.
Deviation (rate of change) between the input signal and the valve opening: Input pressure sensor 2, valve opening sensor 5
-Positioner output flow rate (change rate): Positioner output flow rate sensor 1, valve pressure sensor 4

In this embodiment, the first calculated value (deviation rate of change) is plotted on the X-axis graph plane and the second calculated value (positioner output flow rate change rate) is plotted on the XY-axis graph plane with the Y-axis as the graph axis. At this time, the unit of the deviation rate of change is [% / sec], and the unit of the positioner output flow rate change rate is [NL / sec ² ].

Further, in this embodiment, the distribution of the plot has the following characteristics depending on the operating state of the positioner P. (1) to (5) are circled numbers 1 to 5 in the figure. In the case of a forward operating valve, the plot is reversed left and right.
(1) The deviation increases, but the positioner output flow rate does not change (deviation → delay in flow rate increase).
(2) When the deviation accumulates, the positioner output flow rate increases.
(3) The deviation decreases as the positioner output flow rate increases (the plot moves in the negative direction).
(4) The positioner output flow rate decreases so that the deviation returns to zero.
(5) The control state is balanced.

The process of abnormality detection in this embodiment will be described. In this embodiment, the abnormal mode is determined by the change in the plot characteristics with respect to the normal state. First, FIG. 10 shows a plot display in the normal state. With the passage of time, plots are made along the direction of the arrow from No. 1 to No. 5.

Next, as an abnormal mode caused by the positioner P, FIG. 11 shows a plot display when a foreign matter adheres to the pilot inner valve. In this case, the plot is collapsed up and down. Therefore, the abnormal site can be detected from the difference pattern of such distribution features.

Further, FIG. 12 shows a plot display when the output (air) pipe is clogged or the supply (air) pipe is clogged as an abnormal mode caused by the positioner P. In this case, No. 5 (circled portion in the figure) becomes vertically large. Therefore, the abnormal site can be detected from the difference pattern of such distribution features.

On the other hand, in the abnormal mode caused by the drive unit / internal valve, the positioner input signal changes, but the valve does not move easily, so the deviation becomes large, and the plot becomes large. For this reason, the plot changes even in the abnormal mode caused by the drive unit / internal valve, and it is difficult to grasp the characteristics of each abnormal mode.

For example, as an abnormal mode caused by the drive unit / inner valve, plot displays when the inner valve stem is eccentric are shown in FIGS. 13 to 15. In this case, the plot becomes large, which is different from the plot seen in the abnormal mode due to the positioner P (No. 5 is distributed on the diagonal broken line).

<Example 3>
In this embodiment, the abnormal part detection device shown in FIG. 16 is used, the first calculated value is calculated from the measured value of the positioner output flow rate sensor 1, and the second calculated value is the measurement of the positioner supply flow rate sensor 3. It is calculated from the value and is calculated from the measured value of the valve pressure sensor 4. That is, since the relationship between the positioner output flow rate and the positioner supply flow rate is affected by the amount of bleed from the positioner, it is possible to detect an abnormality in the positioner's air piping system. The positioner supply flow rate and the positioner output flow rate can be measured using the following sensors.
-Positioner supply flow rate: Positioner supply flow rate sensor 3
-Positioner output flow rate: Positioner output flow rate sensor 1, valve pressure sensor 4

In this embodiment, the first calculated value (positioner output flow rate) is provided in parallel, and the Y-axis (Y1, Y2) of a plurality of second calculated values (positioner supply flow rate) (valve pressure) is provided in parallel, and each X is provided. -The Y-axis plot display is superimposed and displayed. At this time, the unit of the positioner output flow rate is [NL / min], the unit of the positioner supply flow rate is [NL / min], and the unit of the valve pressure is [kPa].

The positioner of this embodiment has the following features.
(1) The positioner supply flow rate also increases or decreases as the positioner output flow rate increases or decreases.
(2) Looking at the plots of the positioner supply flow rate and the valve pressure, it can be seen that the positioner supply flow rate is affected by the valve pressure because it has the same shape.

The process of abnormality detection in this embodiment will be described. In this example, in order to reduce the influence of the fluctuation of the positioner output flow rate, the judgment was made by focusing on the index. First, FIG. 17 shows a plot display in the normal state. Here, the positioner supply flow rate prediction line (diagonal line in the figure) at a valve pressure of 150 kPa is used as an index.

Next, FIG. 18 shows a plot display when the pilot seat portion is scratched as an abnormal mode caused by the positioner P. In this case, the positioner supply flow rate forecast line moves upward. Therefore, the abnormal site can be detected from the difference pattern of such distribution features.

Further, as an abnormal mode caused by the positioner P, FIG. 19 shows a plot display when a foreign matter adheres to the pilot inner valve. In this case, the positioner supply flow rate forecast line moves downward. Therefore, the abnormal site can be detected from the difference pattern of such distribution features.

On the other hand, FIG. 20 shows a plot display when the inner valve stem is eccentric as an abnormal mode caused by the drive unit / inner valve. In this case, the plotted range increases, but the positioner supply flow rate forecast line does not change, so it is difficult to capture the characteristics of each abnormal mode.

Although the present invention is generally configured as described above, it is by no means limited to the illustrated embodiment, and various modifications can be made within the description of "Claims", for example, of a positioner. As the fluid, various gases and liquids can be used.

Further, the combination of the sensors used for calculating the first calculated value and the second calculated value can also be changed, and any of these belongs to the technical scope of the present invention.

1 Positioner output flow rate sensor 2 Input pressure sensor 3 Positioner supply flow rate sensor 4 Valve pressure sensor 5 Valve opening sensor P Positioner B Control valve

Claims (5)

An abnormality detection device for a control valve system that controls the flow rate or pressure of a control valve with a fluid pressure type positioner.
The valve drive unit has a positioner output flow rate sensor that can measure the fluid flow rate output from the positioner to the control valve through piping.
An input pressure sensor that can measure the pressure input to the positioner according to the input signal of a predetermined waveform given periodically, and
A positioner supply flow rate sensor that can measure the fluid flow rate supplied to the positioner, and
A valve pressure sensor that can measure the valve pressure of the control valve and
At least a plurality of valve opening sensors capable of measuring the valve opening of the control valve are arranged.
It is possible to acquire the measured values of each of the sensors at a predetermined time point, and
The first calculated value and the second calculated value are calculated based on the single or multiple measured values at the same time point.
The first calculated value and the second calculated value at each measurement time within a predetermined period can be plotted and displayed on the XY-axis graph plane having each as the graph axis.
And the plot displaying, in response to the difference patterns of distribution characteristics of the previously obtained normal-time plot display, abnormalities detectable der the control valve system,
The first calculated value is calculated from the measured value of the positioner output flow rate sensor and the measured value of the valve pressure sensor, and
The second calculated value is changed by calculating the rate of change from the measured value of the valve opening sensor.
An abnormality site detection device for a control valve system characterized in that an abnormality in the valve body can be detected. An abnormality detection device for a control valve system that controls the flow rate or pressure of a control valve with a fluid pressure type positioner.
The valve drive unit has a positioner output flow rate sensor that can measure the fluid flow rate output from the positioner to the control valve through piping.
An input pressure sensor that can measure the pressure input to the positioner according to the input signal of a predetermined waveform given periodically, and
A positioner supply flow rate sensor that can measure the fluid flow rate supplied to the positioner, and
A valve pressure sensor that can measure the valve pressure of the control valve and
At least a plurality of valve opening sensors capable of measuring the valve opening of the control valve are arranged.
It is possible to acquire the measured values of each of the sensors at a predetermined time point, and
The first calculated value and the second calculated value are calculated based on the single or multiple measured values at the same time point.
The first calculated value and the second calculated value at each measurement time within a predetermined period can be plotted and displayed on the XY-axis graph plane having each as the graph axis.
And the plot displaying, in response to the difference patterns of distribution characteristics of the previously obtained normal-time plot display, abnormalities detectable der the control valve system,
The first calculated value is the rate of change as a deviation between the measured value of the input pressure sensor and the measured value of the valve opening sensor.
The second calculated value is calculated from the measured value of the positioner output flow rate sensor and the measured value of the valve pressure sensor.
An abnormality site detection device for a control valve system, characterized in that an abnormality of the positioner itself can be detected. An abnormality detection device for a control valve system that controls the flow rate or pressure of a control valve with a fluid pressure type positioner.
The valve drive unit has a positioner output flow rate sensor that can measure the fluid flow rate output from the positioner to the control valve through piping.
An input pressure sensor that can measure the pressure input to the positioner according to the input signal of a predetermined waveform given periodically, and
A positioner supply flow rate sensor that can measure the fluid flow rate supplied to the positioner, and
A valve pressure sensor that can measure the valve pressure of the control valve and
At least a plurality of valve opening sensors capable of measuring the valve opening of the control valve are arranged.
It is possible to acquire the measured values of each of the sensors at a predetermined time point, and
The first calculated value and the second calculated value are calculated based on the single or multiple measured values at the same time point.
The first calculated value and the second calculated value at each measurement time within a predetermined period can be plotted and displayed on the XY-axis graph plane having each as the graph axis.
And the plot displaying, in response to the difference patterns of distribution characteristics of the previously obtained normal-time plot display, abnormalities detectable der the control valve system,
While it is possible to provide multiple Y-axis and display each XY-axis plot display in an overlapping manner,
The first calculated value is calculated from the measured value of the positioner output flow rate sensor, and
The second calculated value is calculated from the measured value of the positioner supply flow rate sensor and is calculated from the measured value of the valve pressure sensor.
By superimposing each XY-axis plot display,
An abnormality site detection device for a control valve system, characterized in that an abnormality of the positioner itself can be detected. The positioner output flow rate sensor is a flow meter installed in the piping.
The abnormality site detection device for a control valve system according to any one of claims 1 to 3, wherein the flow rate can be directly measured. The positioner output flow rate sensor is a pressure gauge placed outside the piping.
Diaphragm chamber volume from the valve opening degree sensor is measured, and, using the measured values of Ben圧by the pressure gauge, according to claim 1, characterized in that the measured value of the positioner output flow from the translation by the state equation - The abnormality site detection device for the control valve system according to any one of 3 .