JP7000124B2 - Valve maintenance support device and method - Google Patents

Description

The present invention relates to a valve maintenance support device and a method for supporting maintenance work of a bellows valve provided with a bellows-shaped bellows (bellows seal) provided so as to surround the outer periphery of a valve shaft coupled to a valve body.

Conventionally, valves used in petroleum and chemical plants need to pay particular attention to safety, and for this reason, regular maintenance is performed. FIG. 12 shows an example of a valve (control valve) used in petroleum and chemical plants.

The valve 100 includes a valve body 101, a positioner 102, and an actuator 103. The actuator 103 has a spring-type diaphragm structure, and the valve shaft (valve shaft (diaphragm) 103a of the actuator is displaced against the force of the spring 103b according to the air pressure Po supplied from the positioner 102. The stem) 104 is moved up and down to adjust the opening degree of the valve (the gap between the valve body 105 and the seat ring 106). That is, it regulates the flow of fluid.

The positioner 102 detects the lift position of the valve shaft 104, that is, the actual opening of the valve from the rotation angle position of the feedback lever 107 connected to the valve shaft 104, and determines the difference between the detected actual opening and the set opening. The corresponding air pressure Po is supplied to the actuator 103.

In the valve 100, a bellows-shaped bellows (bellows seal) 108 is provided on the outer periphery of the valve shaft 104 coupled to the valve body 105 in order to prevent fluid from leaking to the outside. The bellows 108 is made of a corrosion-resistant metal material, and is provided in a lower flange 109 connected to the valve body 101 so as to surround the outer periphery of the valve shaft 104.

Within the lower flange 109, the bellows 108 is supported between the bellows ring 111 fitted to the valve shaft 104 and the bellows flange 112 sandwiched between the lower flange 109 and the upper flange 110. In the upper flange 110, a gland packing 113 is provided between the outer peripheral surface of the valve shaft 104 and the inner peripheral surface of the upper flange 110 in order to further prevent the fluid from leaking to the outside.

A valve 100 provided with such a bellows-shaped bellows 108 is called a bellows valve (see, for example, Patent Document 1). Hereinafter, the bellows valve is indicated by the reference numeral VB to distinguish it from other types of valves 100. In the following description, the term valve 100 refers to a valve including a bellows valve VB.

The valve 100 may use a reverse-acting actuator or a normal-acting actuator. Like the bellows valve VB shown in FIG. 12, the reverse operation actuator urges the opening degree of the valve in the closing direction by the force of the spring. On the contrary, the positive actuator urges the opening of the valve in the opening direction by the force of the spring. Further, in the bellows valve VB shown in FIG. 12, the actuator 103 is operated by air pressure, but there is also a type in which the actuator 103 is operated by hydraulic pressure.

In a plant where such a valve is installed, it is necessary to efficiently maintain a large number of valves, and in order to improve the efficiency of the maintenance work, valve stick slip detection (see, for example, Patent Document 2) and valves Methods such as hunting detection (see, for example, Patent Document 3) and valve scale adhesion detection (see, for example, Patent Document 4) have been proposed.

JP-A-2007-154929 Japanese Patent No. 3254624 Japanese Unexamined Patent Publication No. 2015-114942 Japanese Unexamined Patent Publication No. 2015-114943

However, there is no complete or sufficient upper limit for safety and efficiency of maintenance work. Since many valves are used in petroleum and chemical plants, further improvement in the efficiency of maintenance work is required.

The present invention has been made to solve such a problem, and an object thereof is a valve maintenance support device capable of improving the efficiency of valve maintenance work, especially when handling a bellows valve. And to provide a method.

In order to achieve such an object, the present invention has a bellows valve (VB) provided with a bellows-shaped bellows (108) provided so as to surround the outer periphery of the valve shaft (104) coupled to the valve body (105). ) Is a valve maintenance support device (200) that supports the maintenance work, and the opening measurement value data (D1) and the bellows valve transmitted from the opening measuring unit (21) that measures the opening of the bellows valve are used. A measurement value data storage unit (1) that stores pressure measurement value data (D2) transmitted from a pressure measurement unit (22) that measures the fluid pressure (Po) supplied to the driven operation device (103), and a measurement value data storage unit (1). Diagnostic index calculation unit (3) that calculates information on the maximum frictional force of the bellows valve as the diagnostic index (F) of the bellows valve based on the opening measurement value data and pressure measurement value data stored in the measurement value data storage unit. A diagnostic index presentation unit (4) that presents the diagnostic index of the bellows valve calculated by the diagnostic index calculation unit, and a threshold storage unit (6) that stores the upper limit of the normal range for the diagnostic index as the diagnostic index threshold. When the diagnostic index of the bellows valve calculated by the diagnostic index calculation unit is equal to or higher than the diagnostic index threshold, the judgment unit (5) determines that the bellows valve is a valve requiring maintenance, and the judgment unit performs maintenance. It is characterized by comprising a determination result presenting unit (7) for presenting a bellows valve determined to be necessary.

In the present invention, the measurement value data storage unit stores the opening measurement value data from the opening measurement unit and the pressure measurement value data from the pressure measurement unit. The diagnostic index calculation unit calculates information on the maximum frictional force of the bellows valve as a diagnostic index of the bellows valve based on the opening measurement value data and the pressure measurement value data stored in the measurement value data storage unit.

In the bellows valve, when deformation such as a partial dent occurs in the bellows (when bending occurs in a portion that is not originally bent and deformation that cannot be restored), the force for distorting the bellows increases. This increase in the force that distorts the bellows appears as an increase in the maximum frictional force (maximum frictional force generated between the bellows valve and the valve shaft) of the bellows valve, and the calculated diagnostic index of the bellows valve becomes large. The calculated diagnostic index of the bellows valve is presented to the operator as an index indicating whether or not the bellows is suspected to be deformed.

In addition, the calculated diagnostic index of the bellows valve is compared with the diagnostic index threshold (upper limit value of the normal range) stored in the threshold storage unit, and the calculated diagnostic index of the bellows valve is equal to or higher than the diagnostic index threshold. It is determined that the bellows valve is a valve that requires maintenance. This determination result is also presented to the operator.

In the above description, as an example, the components on the drawing corresponding to the components of the invention are shown by reference numerals in parentheses.

As described above, according to the present invention, information on the maximum frictional force of the bellows valve is calculated as a diagnostic index of the bellows valve based on the opening measurement value data and the pressure measurement value data, and the calculated bellows valve is used. The diagnostic index of the bellows valve is presented to the operator as an index indicating whether or not the bellows is suspected to be deformed, and if the calculated diagnostic index of the bellows valve is equal to or higher than the diagnostic index threshold value, the bellows valve needs maintenance. The valve is determined to be a good valve and presented to the operator, and the efficiency of valve maintenance work can be improved, especially when handling a bellows valve.

FIG. 1 is a diagram schematically showing a state before and after compression of a bellows when no deformation has occurred. FIG. 2 is a diagram schematically showing a state before and after compression of a bellows when deformation occurs. FIG. 3 is a block diagram showing a configuration of a main part of the valve maintenance support device according to the first embodiment of the present invention. FIG. 4 is a flowchart showing how the opening measurement value data and the pressure measurement value data are accumulated in the measurement value data storage unit of the valve maintenance support device. FIG. 5 is a diagram illustrating changes in the valve opening degree θ and the air pressure Po in one vertical movement when the valve actuator is a reverse operation actuator. FIG. 6 is a diagram illustrating changes in the valve opening degree θ and the air pressure Po in one vertical movement when the valve manipulator is a normal operating device. FIG. 7 is a flowchart for explaining the operation of this valve maintenance support device. FIG. 8 is an image diagram showing an example of valve arrangement of a plant to be maintained. FIG. 9 is a diagram showing changes in the maximum frictional force of a valve (bellows valve) with the passage of time. FIG. 10 is a diagram showing a display example of a diagnostic index of a valve (bellows valve) as a maintenance candidate. FIG. 11 is a diagram illustrating a configuration (implementation example of the first embodiment) of the plant and its equipment management system according to the second embodiment of the present invention. FIG. 12 is a diagram showing an example of a control valve (bellows valve).

[Principle of invention]
The inventor has stated that in the case of a bellows valve that uses a bellows (bellows seal), if deformation such as a partial dent occurs in the bellows (bending occurs in a part that is not originally a bent part, and deformation that cannot be restored occurs. And), I focused on increasing the force that distorts the bellows.

That is, the force required to distort the entire bellows in a normal bellows causes deformation as a defect (deformation that deviates from the shape designed for efficient deformation (hereinafter, simply referred to as deformation)). If this is the case, an extra force is required for the deformed portion than the force for proper elastic deformation, so that the total force required for distorting the bellows increases. For example, when the bellows is distorted like a compression spring, the bending method deviates from the design, and the deformed part requires a force deviating from the design.

FIG. 1 schematically shows the state before and after compression of the bellows when no deformation has occurred. FIG. 1A shows the state of the bellows before compression, and FIG. 1B shows the state of the bellows after compression. If the bellows are not deformed, all bends will be distorted as designed.

FIG. 2 schematically shows the state before and after compression of the bellows when the bellows is deformed. When the bellows is deformed, a force that deviates from the design is required at the deformed part, and the force that distorts the bellows increases.

This increase in the force that distorts the bellows appears as an increase in the maximum frictional force (maximum frictional force generated between the bellows valve and the valve shaft) of the bellows valve, considering the mounting state of the bellows. The inventor has come up with the idea that by presenting information about the maximum frictional force of the bellows valve to the operator as a diagnostic index of the bellows valve, it becomes possible to estimate whether or not the bellows is suspected to be deformed. This makes it possible to improve the efficiency of valve maintenance work, especially when handling bellows valves.

[Embodiment 1]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 3 is a block diagram showing a configuration of a main part of the valve maintenance support device according to the first embodiment of the present invention. Here, for the sake of brevity, the example of the valve ID (identification information) will be simpler than that used in an actual plant.

The valve maintenance support device 200 of the present embodiment is realized by hardware including a processor and a storage device, and a program that realizes various functions in cooperation with these hardware, and includes a measured value data storage unit 1 and a storage unit 1. It includes a valve ID storage unit 2, a diagnostic index calculation unit 3, a diagnostic index presentation unit 4, a determination unit 5, a threshold storage unit 6, and a determination result presentation unit 7.

In the valve maintenance support device 200, the measured value data storage unit 1 is transmitted from the opening measurement value data D1 and the pressure measuring unit 22 transmitted from the opening measurement unit 21 of the valve 100 used in the plant. The incoming pressure measurement value data D2 is stored.

That is, the valve 100 used in the plant includes an opening degree measuring unit 21 for measuring the opening degree θ of the valve and a pressure measuring unit 22 for measuring the air pressure Po supplied to the actuator of the valve. There is. The opening measurement unit 21 transmits the measured valve opening θ as opening measurement value data D1 to the valve maintenance support device 200, and the pressure measurement unit 22 uses the measured air pressure Po as pressure measurement value data D2 to support valve maintenance. It is transmitted to the device 200.

When the valve maintenance support device 200 receives the opening degree measurement value data D1 from the opening degree measuring unit 21 (YES in step S101), as shown in the flowchart in FIG. 4, the valve maintenance support device 200 receives the received opening degree measurement value data D1. When the measured value data storage unit 1 stores the measured value data (step S102) and the pressure measured value data D2 from the pressure measuring unit 22 is received (YES in step S103), the received pressure measured value data D2 is stored in the measured value data storage unit 1. Is stored in (step S104).

FIG. 5 illustrates changes in the valve opening θ (opening measurement value data D1) and air pressure Po (pressure measurement value data D2) in one vertical movement when the valve 100 operator is used as a reverse operation controller. Then, in FIG. 6, changes in the valve opening θ (opening measurement value data D1) and air pressure Po (pressure measurement value data D2) in one vertical movement when the valve 100 actuator is used as a normal operation controller. Is illustrated.

In the present embodiment, the opening measurement value data D1 and the pressure measurement value data D2 are periodically transmitted from the opening degree measuring unit 21 and the pressure measuring unit 22 of the valve 100 to the measured value data storage unit 1. It shall be accumulated as time series data.

Further, in the present embodiment, a large number of valves 100 including bellows valves VB (FIG. 12) are installed in the plant, and opening measurement value data D1 from these valves 100 (100-1 to 100-N). It is assumed that (D1 ₁ to D1 _N ) and the pressure measurement value data D2 (D2 ₁ to D2 _N ) are stored in the measurement value data storage unit 1 in association with the ID of the valve.

Hereinafter, the operation of the valve maintenance support device 200 will be specifically described with reference to the flowchart shown in FIG. 7, with the functions of each part.

The operator targets the valves 100-1 to 100-N installed in the plant as measurement targets, determines maintenance candidate valves from the measurement target valves 100-1 to 100-N, and determines the maintenance candidate valves. Register the valve (step S201).

In this case, the ID of the valve registered as the valve as a candidate for maintenance (hereinafter, also referred to as a valve ID) is stored in the valve ID storage unit 2 of the valve maintenance support device 200.

For example, assuming that there are 26 valves 100 in the plant, these 26 valves 100 have "A", "B", "C", ..., "M", ..., "X", " It is assumed that unique IDs "Y" and "Z" are assigned in advance. When valves A, M, and C are defined as candidate valves for maintenance, the operator inputs "A", "M", and "C" as valve IDs.

In this embodiment, it is assumed that the valves A, M, and C are bellows valves VB as shown in FIG. 12, and are selected as the highest priority maintenance target in a specific periodic plant maintenance. Hereinafter, the valves A, M, and C are also referred to as bellows valves A, M, and C.

FIG. 8 is an image diagram showing an example of valve arrangement of a plant to be maintained. In the present embodiment, valves 100-A (bellows valve A) and 100-M (bellows valve M) having valve IDs "A" and "M" are arranged in the flow path 11-1 of the flow path ID "1". It is assumed that the valve 100-C (bellows valve C) having the valve ID “C” is arranged in the flow path 11-3 of the flow path ID “3”.

In FIG. 8, 12-A, 12-C, and 12-M are flow rate measuring instruments, 13 is a tank, and 14 is a pressure transmitter. In FIG. 8, the description is omitted for valves whose valve IDs are other than "A", "C", and "M".

When the diagnostic index calculation unit 3 receives an instruction to calculate the diagnostic index (YES in step S202), the maintenance candidate valve IDs “A”, “C”, and “M” stored in the valve ID storage unit 2 (Step S203), and the opening measurement value data D1 and the pressure measurement value data D2 stored in the measurement value data storage unit 1 in association with the read valve IDs “A”, “C”, and “M”. Is read (step S204).

Then, the diagnostic index calculation unit 3 determines the maximum frictional force (with the valve shaft) of the bellows valves A, C, and M based on the opening measurement value data D1 and the pressure measurement value data D2 read from the measurement value data storage unit 1. Information on the maximum frictional force generated between them) is calculated as the diagnostic index F (FA, FC, FM) of the bellows valves _A , _C , _M (step S205).

FIG. 9 shows the change in the maximum frictional force of the bellows valve with the passage of time. The diagnostic index calculation unit 3 is required to reduce the air pressure Po supplied to the actuator required for increasing the opening degree of the bellows valve and the opening degree of the bellows valve at the same opening degree. The pressure difference from the air pressure Po supplied to the actuator is obtained as information on the maximum frictional force, and the information on this maximum frictional force is used as the diagnostic index F of the bellows valve. For example, the immediately preceding 24 hours is set as the diagnosis target period, the information on the maximum frictional force within this diagnosis target period is obtained as the information on the current maximum frictional force, and the information on the current maximum frictional force is used as the diagnostic index F of the bellows valve. do.

The diagnostic index _F (FA, _FC , _FM ) calculated by the diagnostic index calculation unit 3 is sent to the diagnostic index presentation unit 4. The diagnostic index presentation unit 4 presents the diagnostic index F from the diagnostic index calculation unit 3 to the operator as a diagnostic index for the maintenance candidate valve (bellows valve), that is, as an index for notifying the presence or absence of suspicion of deformation of the bellows (step). S206).

For example, as shown in FIG. 10 as the display area of the diagnostic index as # 1, it corresponds to the bellows valves A, C, and M, which are maintenance candidate valves, that is, the IDs “A”, “ The numerical values of the diagnostic indexes FA, _FC , and FM calculated by the diagnostic index calculation unit 3 are displayed on the display in association with " _C " and " _M ".

At this time, as shown in FIG. 10 as the presentation area of the diagnostic target portion as # 2, the diagnostic indexes FA, _FC , and FM presented (displayed) in the diagnostic index presentation area # 1 are _bellows valves _A , By presenting (displaying) that the state of the bellows attached to C and M is targeted, it is necessary to pay attention to the bellows for the operator who has little knowledge about the need for maintenance of the bellows. Is quantitatively shown, so that the risk of bellows check omission can be reduced.

The diagnostic index _F (FA, _FC , _FM ) calculated by the diagnostic index calculation unit 3 is also sent to the determination unit 5. In the threshold value storage unit 6, the upper limit value of the normal range with respect to the diagnostic index F is stored as the diagnostic index threshold value Fth.

When the diagnostic index F is sent from the diagnostic index calculation unit 3, the determination unit 5 reads out the diagnostic index threshold value Fth stored in the threshold storage unit 6 (step S207), and the diagnostic index from the diagnostic index calculation unit 3. F is compared with the diagnostic index threshold Fth (step S208). In this case, each of the diagnostic indexes _FA , _FC , and FM from the diagnostic index calculation unit 3 is compared with the diagnostic index threshold value _Fth .

Here, when the diagnostic index F from the diagnostic index calculation unit 3 is equal to or higher than the diagnostic index threshold value Fth (YES in step S208), the determination unit 5 determines that the valve (bellows valve) requires maintenance. Determination (step S209). For example, when the diagnostic index FM among the diagnostic indexes _FA , _FC , and FM is equal to or higher than the diagnostic index threshold value _Fth , the bellows valve _M is determined to be a valve requiring maintenance. The determination unit 5 sends this determination result to the determination result presentation unit 7.

The determination result presenting unit 7 presents the determination result from the determination unit 5 to the operator (step S210). For example, when the bellows valve M is determined to be a valve requiring maintenance among the bellows valves A, C, and M which are candidate valves for maintenance, the bellows is set in the diagnostic index presentation area # 1 shown in FIG. The valve ID of the bellows valve _M and the diagnostic index FM are displayed in red as valves suspected of being deformed. In this case, the valve IDs of the bellows valves _A and _C and the diagnostic indexes FA and FC are displayed in black. At this time, the diagnostic index threshold value Fth used at the time of determination may be displayed in the diagnostic index presentation area # 1.

In this embodiment, the diagnostic index of the maintenance candidate valves (bellows valves A, C, M) and the judgment result of whether or not the valve requires maintenance is displayed on the display, but the printer is used. It may be launched by such as, or it may be notified by voice.

Further, in this embodiment, the diagnostic index calculation unit 3 calculates the diagnostic index F only for the valves (bellows valves A, C, M) that are candidates for maintenance, but all the valves to be measured (valves). The diagnostic index F may be calculated for A to Z).

In this case, in the diagnostic index presentation unit 4, the valve IDs of all the valves to be measured and the diagnostic index F are associated with each other. , Valves that are judged to require maintenance should be displayed separately, such as in red.

Further, the diagnostic index threshold value Fth depends on how much deformation is a problem, and may be appropriately determined according to the trade-off between the risk caused by the deformation of the bellows and the maintenance cost. Further, the diagnostic index threshold value Fth may be determined based on the frictional force when the cumulative value of the sliding distance assumed that no deformation has occurred is small (initial state).

[Embodiment 2]
Next, the valve maintenance support device according to the second embodiment of the present invention will be described. The second embodiment explains the implementation example of the first embodiment. FIG. 11 is a diagram showing the configurations of the plant and its equipment management system, and the same configurations as those of FIG. 8 are designated by the same reference numerals.

Petroleum and chemical plants are provided with an equipment management system 8 that controls and manages each equipment of the plant. Since the measured value data storage unit 1, the valve ID storage unit 2, the diagnostic index calculation unit 3, the determination unit 5, and the threshold value storage unit 6 described in the first embodiment handle a huge amount of plant-specific information, the equipment management system It is preferably mounted on the 8 side.

On the other hand, the diagnostic index presentation unit 4 and the determination result presentation unit 7 provide, in principle, particularly necessary processing when determining valve maintenance. In addition, the maintenance performer (the person in charge of the work of the maintenance contractor) is generally outsourced by the plant owner company to carry out the maintenance of the plant. Therefore, assuming that an unspecified number of plants are targeted, the diagnostic index presentation unit 4 and the determination result presentation unit 7 are mounted on the portable computer 9 carried by the worker (operator) of the maintenance contractor. It is preferable to do so.

The computer 9 includes a CPU (Central Processing Unit), a memory, and an interface. The equipment management system 8 of the plant and the computer 9 are temporarily connected to each other by using a communication function such as Ethernet (registered trademark) when performing maintenance work.

When the operator starts the application software on the computer 9, the CPU of the computer 9 executes the process according to the program stored in the memory, sends a calculation instruction of the diagnostic index to the device management system 8, and registers it in the device management system 8. For the maintenance candidate valves (bellows valves) that have been performed, the diagnostic index is calculated and it is determined whether or not maintenance is necessary. The diagnostic index of the maintenance candidate valve (bellows valve) calculated by the device management system 8 and the determination result of whether or not maintenance is necessary are displayed on the display of the computer 9.

In this example, it is assumed that the maintenance candidate valve (bellows valve) is already registered in the device management system 8, but the operator can register or change the maintenance candidate valve (bellows valve) from the computer 9. Can also be done.

Based on the diagnostic index of the maintenance candidate valve (bellows valve) displayed on the display of the computer 9 and the judgment result of whether maintenance is necessary, the operator pays particular attention to the inspection of the bellows valve (bellows valve). confirm. After confirmation, the operator disconnects the computer 9 from the device management system 8.

In this way, the valve maintenance support device 200 described in the first embodiment can be applied to an actual plant.

[Extension of Embodiment]
Although the present invention has been described above with reference to the embodiments, the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the structure and details of the present invention within the scope of the technical idea of the present invention.

1 ... Measurement value data storage unit, 2 ... Valve ID storage unit, 3 ... Diagnostic index calculation unit, 4 ... Diagnostic index presentation unit, 5 ... Judgment unit, 6 ... Threshold storage unit, 7 ... Judgment result presentation unit, 21 ... Open Degree measuring unit, 22 ... Pressure measuring unit, 100 (100-1 to 100-N) ... Valve, 101 ... Valve body, 102 ... Positioner, 103 ... Operator, 104 ... Valve shaft, 105 ... Valve body, 108 ... Bellows , VB ... Bellows valve, 200 ... Valve maintenance support device.

Claims (4)

A valve that utilizes the phenomenon generated by the frictional force acting on the valve shaft to support the maintenance work of the bellows valve equipped with a bellows-shaped bellows provided so as to surround the outer circumference of the valve shaft coupled to the valve body. It is a maintenance support device
The pressure transmitted from the opening measurement value data transmitted from the opening measurement unit that measures the opening degree of the bellows valve and the pressure measuring unit that measures the fluid pressure supplied to the operator that drives the bellows valve. A measured value data storage unit that stores measured value data,
The fluid supplied to the operator required for increasing the opening degree of the bellows valve based on the opening degree measurement value data and the pressure measurement value data stored in the measurement value data storage unit. The pressure difference between the pressure and the fluid pressure supplied to the operator required to reduce the opening degree of the bellows valve is calculated as a diagnostic index regarding an increase in the force of the bellows valve to distort the bellows. Diagnostic index calculation unit and
A diagnostic index presentation unit that presents the diagnostic index of the bellows valve calculated by the diagnostic index calculation unit, and a diagnostic index presentation unit.
A threshold storage unit that stores the upper limit of the normal range in which the bellows is not deformed or is small with respect to the diagnostic index as the diagnostic index threshold.
The diagnostic index of the bellows valve calculated by the diagnostic index calculation unit is compared with the diagnostic index threshold value, and as a result of the comparison , the bellows valve is maintained only when the diagnostic index is equal to or higher than the diagnostic index threshold value. Judgment unit that determines that is a necessary valve,
A valve maintenance support device including a determination result presentation unit that presents a bellows valve that is determined to require maintenance by the determination unit as a valve that is suspected of being deformed . In the valve maintenance support device according to claim 1 ,
The diagnostic index presentation unit is
A valve maintenance support device, which, together with the diagnostic index, presents that the diagnostic index targets the state of the bellows mounted on the bellows valve. In the valve maintenance support device according to claim 1 or 2 .
Equipped with a valve identification information storage unit that stores the identification information of bellows valves registered as maintenance candidate valves.
The measured value data storage unit is
A plurality of valves including the maintenance candidate valve are targeted for measurement, and the opening measurement value data and the pressure measurement value data are stored in association with the valve identification information for each of the measurement target valves.
The diagnostic index calculation unit is
The valve identification information of the maintenance candidate valve stored in the valve identification information storage unit is read out, and the opening measurement value data and the opening measurement value data stored in the measurement value data storage unit are associated with the read identification information. A valve maintenance support device for calculating the diagnostic index for each of the maintenance candidate valves based on the pressure measurement value data. A valve that utilizes the phenomenon generated by the frictional force acting on the valve shaft to support the maintenance work of the bellows valve equipped with a bellows-shaped bellows provided so as to surround the outer circumference of the valve shaft coupled to the valve body. It ’s a maintenance support method.
The pressure transmitted from the opening measurement value data transmitted from the opening measurement unit that measures the opening degree of the bellows valve and the pressure measuring unit that measures the fluid pressure supplied to the operator that drives the bellows valve. The measured value data storage step for storing the measured value data in the measured value data storage unit,
The fluid supplied to the operator required for increasing the opening degree of the bellows valve based on the opening degree measurement value data and the pressure measurement value data stored in the measurement value data storage unit. The pressure difference between the pressure and the fluid pressure supplied to the operator required to reduce the opening degree of the bellows valve is calculated as a diagnostic index regarding an increase in the force of the bellows valve to distort the bellows. Diagnostic index calculation step and
A diagnostic index presentation step that presents the diagnostic index of the bellows valve calculated by the diagnostic index calculation step, and a diagnostic index presentation step.
A threshold storage step for storing the upper limit of the normal range in which the bellows is not deformed or small with respect to the diagnostic index as a diagnostic index threshold in the threshold storage unit.
The diagnostic index of the bellows valve calculated by the diagnostic index calculation step is compared with the diagnostic index threshold value, and as a result of the comparison , the bellows valve is maintained only when the diagnostic index is equal to or higher than the diagnostic index threshold value. Judgment step to determine that is a required valve,
A valve maintenance support method comprising: a determination result presentation step of presenting a bellows valve determined to require maintenance by the determination step as a valve suspected of being deformed .

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