JP2000088131A - Flow rate control device for valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress flow rate fluctuation caused by a characteristic of a valve and to improve control accuracy by constituting a device so as to be provided with a storage means storing operating characteristic data of the valve, to correct driving amount of a valve element that an instruction means instructs by operating characteristic data and to make a driving means to output driving amount. SOLUTION: When it is judged that instructed opening is inputted after a CPU 6 performs an A/D conversion for an instruction signal from an instruction means in an A/D conversion part 8, the CPU 6 calculates a rotation distance of valve element required for changing opening of a valve 4 to instructed opening from the present opening of the valve element, from flow rate characteristic data corresponding to opening for every resolution of the valve 4 stored in an EEPROM 10. From determined codes of the rotation distance of the valve element, whether the valve 4 should be moved in an open direction or moved in a close direction judged. In the case of the close direction, the rotation distance is corrected by valve element rotation direction opening deviation data stored in the EEPROM 10, the rotation distance is outputted to a motor driving device 5 and value opening is controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow control device for valves such as a ball valve and a butterfly valve.

[0002]

2. Description of the Related Art Conventionally, a valve flow control device is provided inside an actuator by instructing an actuator attached to the valve to indicate the opening degree of the valve by an instruction means, and detects the opening degree of the valve. The valve body of the valve is rotated so that the valve opening becomes the indicated opening while comparing the detected opening of the valve opening sensor, for example, a potentiometer with the indicated opening.

Japanese Patent Application Laid-Open No. 1-220783 discloses that in order to reduce the hysteresis of a proportional control valve, the proportional control valve is forcedly vibrated by driving the proportional control valve with a signal including an AC component when the proportional control valve is energized. A control device for a proportional control valve is described.

[0004]

In the above-described valve flow control device, the opening degree of the valve causes hysteresis in the operating direction of the valve due to mechanical misalignment due to gear backlash in the actuator. For example, as shown in FIG. 6, when there is an instruction to set the opening of the valve to 50%, when the valve body of the valve is moved from the 0% opening position to the 50% opening position, When the valve body of the valve is moved from the opening position of 100% to the opening position of 50%, the operating direction of the valve body is reversed, so that the influence of the valve operating friction, gear backlash, etc. As a result, the opening position of the valve shifts.

In this case, as an example of the valve, when the valve body of the valve is moved in the forward direction from the opening position of 0% to the opening position of 50%, the opening position of the valve does not shift, and When the valve body is moved backward from the 100% opening position to the 50% opening position, a phenomenon occurs such that the opening position of the valve shifts. As described above, hysteresis occurs in the valve opening direction in the valve operating direction due to mechanical deviation due to valve operating friction, gear backlash, etc., and the flow rate of fluid flowing through the valve is initially reduced by the valve opening degree hysteresis. Fluctuates with respect to the value of

[0006] In addition, mechanical displacement also occurs depending on the amount of operation (operating distance, operating speed) of the valve element, and the opening position of the valve shifts. For example, as shown in FIG. 7, when an instruction to set the valve opening to 50% is issued, the valve body of the valve is moved from a position close to the 50% opening position to the 50% opening position. When the valve body is moved 50% from the 0% opening position
The operating distance of the valve differs greatly from when the valve is operated at the opening position of 0%, and the valve of the valve is moved 50% from the opening position of 0%.
%, The actuator can sufficiently accelerate, operate at a constant speed, and decelerate the valve with the capability of the actuator.
When the valve is operated at the opening position of 0%, the valve comes to the stop position during acceleration of the valve (transitional period before the valve reaches a constant speed).

For this reason, when the valve body of the valve is moved from the 0% opening position to the 50% opening position, the opening position of the valve does not shift, but the valve body is located close to the 50% opening position. When the valve is operated to an opening position of 50% to 50%, the opening position of the valve shifts, and the flow rate of the fluid flowing through the valve fluctuates. Of course, this phenomenon varies depending on the type of the valve and the type of its driving source (motor), but a deviation of the valve opening position occurs.

Further, the characteristics of the valve, for example, the flow characteristics, vary greatly depending on the configuration of the valve (type of valve, etc.).
Each valve has unique characteristics. Therefore, under certain conditions, a butterfly valve through which 20 (l) of fluid flows per minute at an opening of 100%, and at a opening of 50%, a fluid flows through 4.6 (l) per minute, and the same with a ball valve. At an opening of 100%, a fluid of 20 (l) per minute flows under the condition, and at an opening of 50%, a fluid of 2.5 (l) per minute flows. Therefore, the same performance cannot be obtained for each valve with the same actuator, and a different flow control device must be used each time the configuration of the valve changes.

According to the present invention, it is possible to prevent the fluctuation of the flow rate caused by the mechanical deviation due to the flow rate characteristic of the valve, the operation direction of the valve body and the operation amount, thereby improving the accuracy, and to use the valve even if the valve configuration changes. It is an object of the present invention to provide a flow control device for a valve that can perform pressure reduction.

[0010]

In order to achieve the above object, the present invention according to claim 1 comprises a driving means for driving a valve element of a valve, an instruction means for instructing a driving amount of the valve element, and a valve. Storage means for storing the operation characteristic data, and a calculation means for correcting the drive amount of the valve element designated by the instruction means with the operation characteristic data and outputting the corrected drive amount to the drive means.

According to a second aspect of the present invention, in the valve flow control device according to the first aspect, the storage means includes: operating characteristic data for each resolution of the valve; The arithmetic means stores at least one of correction data according to the rotation distance of the valve element, and the operation means stores the driving amount of the valve element corresponding to the instruction opening degree of the instruction means according to the opening degree instruction of the instruction means. And outputs it to the driving means.

According to a third aspect of the present invention, in the valve flow control device according to the first or second aspect, the storage means stores flow characteristic data corresponding to an opening degree of the valve as the operating characteristic data. is there.

[0013]

FIG. 1 shows a first embodiment of the present invention. In the first embodiment, the stepping motor 2 is connected to the valve body of the valve 4 via the attenuator 3. The valve 4 is, for example, a ball valve, and the stepping motor 2 is driven by a motor driving device 5 to rotate. The attenuator 3 rotates the valve element of the valve 4 by reducing the rotation amount of the stepping motor 2 to, for example, 1/250 and applying the reduced amount to the valve element of the valve 4. Here, the stepping motor 2, the attenuator 3, and the motor driving device 5 constitute driving means for driving the valve body of the valve.

The control unit 6 constituting the arithmetic means is a ROM
7, RAM 9, analog / digital converter (A / D) 8
Is used, and an EEPROM 10 as a storage unit is connected. The power supply device 11 applies a predetermined DC voltage to the CPU 6, the motor driving device 5, the stepping motor 2, and the EEPROM 10. Further, an input signal for instructing the opening degree of the valve 4 is input to the CPU 6 from a not-shown instruction means as a driving amount for driving the valve element.

In the EEPROM 10, data of flow characteristics (characteristics indicating the relationship between the opening and the flow rate) corresponding to the opening degree of each valve resolution is stored in advance as operating characteristic data of each resolution of the valve 4, and In addition, valve body rotation direction opening degree deviation data indicating the deviation of the opening degree position according to the operation direction of the valve body of the valve 4 is stored. Here, the flow rate characteristic corresponding to the opening degree of the ball valve 4 is, as shown by the solid line in FIG. 3, the flow rate of the fluid flowing through the ball valve 4 (from 0% to 100%). Cv value) changes from 0% to 100%.

Accordingly, the EEPROM 10 stores the fluid flowing through the ball valve 4 for each of the 256 degrees of the ball valve 4 divided into 256 sections by dividing the opening of the ball valve 4 from 0% to 100%. Is stored at address 256 as flow characteristic data corresponding to the opening of the ball valve 4, and such flow characteristic data corresponding to the opening of the ball valve 4 is stored for each resolution of the valve 4. Keep it.

The position of the opening of the valve 4 is deviated by the mechanical deviation caused by the operation direction and the operation amount (operating distance, operation speed) of the valve body of the valve 4. However, the mechanical position caused by the operation amount of the valve body depends on the needs of the user. Valve 4 due to misalignment
It may not be necessary to correct the deviation of the opening degree position. Therefore, in this embodiment, no correction data is used for correcting the fluctuation of the flow rate due to the mechanical displacement caused by the operation amount of the valve element.

The stepping motor 2 drives the valve body with ten pulses to set the opening of the ball valve 4 to 1/2 of the 90 ° opening from 0% to 100% corresponding to one address.
In this embodiment, the stepping motor 2 drives the stepping motor 2 in accordance with the valve body rotation direction opening degree shift data for correcting the shift of the opening degree position of the valve 4 due to the mechanical shift caused by the operation direction of the valve body of the valve 4. EEPROM as data for five addresses corresponding to the number of 50 pulses
10 is stored.

FIG. 2 shows an operation flow of the present embodiment. C
The PU 6 performs A / D conversion of the input signal input from the instruction means in step S1 and checks it by the A / D converter 8, and determines whether or not the instruction opening is input from the instruction means.
When the instruction opening degree is input from the instruction means, the CPU 6 determines the opening degree of the valve 4 from the flow characteristic data corresponding to the opening degree for each valve resolution stored in the EEPROM 10 in step S2. The rotation distance of the valve element required to change the present opening degree of the body to the instruction opening degree of the instruction means is calculated.

Next, in step S3, the CPU 6 determines whether the valve should be moved in the opening direction in order to set the opening of the valve 4 to the instructed opening based on the sign of the rotation distance of the valve obtained by the calculation in step S3. Decide whether to move in the direction. When the valve element is to be moved in the opening direction, the CPU 6 does not perform the correction of the rotation distance based on the opening position deviation in the valve element rotating direction because the opening degree deviation in the rotation direction of the valve element does not occur.

If the valve should be moved in the closing direction, the CPU 6 determines in step S4 that the EEPROM 10
According to the valve body rotation direction opening deviation data stored in
The moving distance obtained by the above calculation is corrected so that there is no displacement of the opening degree due to the rotation direction of the valve body, that is, 50 pulses of the driving pulse of the stepping motor 2 are subtracted from the moving distance obtained by the above calculation.

Here, the ball valve 4 has a flow rate characteristic corresponding to the opening as shown by the solid line in FIG. 3, and the dotted line in FIG. 3 shows the flow rate when the opening and the flow rate of the ball valve 4 are proportional. Show characteristics. When the indicated opening is, for example, 25%, the rotation distance of the valve body at which the opening of the valve 4 becomes 25% from the current opening is calculated from the flow rate characteristic data corresponding to the opening for each resolution of the valve. Even if the flow rate of valve 4 is 2
Although the flow rate does not correspond to 5%, the flow distance of the valve 4 is corrected by correcting the movement distance obtained by the calculation so as to eliminate the opening position shift due to the rotation direction of the valve body using the valve body rotation direction opening degree shift data. At a desired flow rate.

Next, the CPU 6 outputs data of the number of pulses corresponding to the corrected moving distance to the motor driving device 5 in a step S5. The motor driving device 5 applies pulses to the stepping motor 2 by the number of pulses input from the CPU 6 to rotate the stepping motor 2, and the stepping motor 2 rotates the valve element of the valve 4 via the attenuator 3 to rotate the valve 4. The opening is defined as the indicated opening. Therefore, the opening degree of the valve 4 does not deviate due to the flow characteristics of the valve 4 or the operating direction of the valve element, and can be satisfied by the user.

As described above, the first embodiment is an embodiment of the first aspect of the present invention, in which the stepping motor 2, the attenuator 3, and the motor drive as driving means for driving the valve element of the valve 4 are provided. A device 5, an instructing means for instructing the driving amount of the valve element, an EPROM 10 as a storage means for storing operating characteristic data of the valve 4, and an operating characteristic of the valve element instructed by the instructing means. C as an arithmetic means for correcting with data and outputting to the driving means
The provision of the PU 6 makes it possible to eliminate the deviation of the valve opening position due to the characteristics of the valve and the operating direction of the valve element, thereby preventing the fluctuation of the flow rate due to the deviation of the valve opening position and improving the accuracy.

This first embodiment is an embodiment of the invention according to claim 3, and in the valve flow control apparatus according to claim 1, the storage means 10 stores the valve as the operating characteristic data. Since the flow characteristic data corresponding to the opening degree of No. 4 is stored, fluctuation of the flow caused by the flow characteristic of the valve can be prevented and accuracy can be improved.

FIG. 4 shows a second embodiment of the present invention. This second embodiment is an embodiment of an apparatus for controlling the flow rate of a butterfly valve. In this second embodiment,
In the first embodiment, the stepping motor 2
A stepping motor 12, an attenuator 13, and a motor driving device 14 are used instead of the attenuator 3 and the motor driving device 5, and the valve body of the butterfly valve 15 is connected to the stepping motor 2 via the attenuating device 3.

A predetermined DC voltage is applied to the stepping motor 12 and the motor driving device 14 from the power supply device 11.
The motor driving device 14 is controlled by the CPU 6. The stepping motor 12 is driven by a motor driving device 14, and the stepping motor 12 rotates the valve body of the butterfly valve 15 via the attenuator 13. EPROM10
Is stored in advance as operating characteristic data of the butterfly valve 15 and flow rate characteristic data corresponding to the degree of opening of the butterfly valve 15 for each resolution, and the deviation of the opening position due to the operating direction of the valve body of the butterfly valve 15 is determined. The valve body rotation direction opening deviation data shown is stored.

The flow characteristic corresponding to the opening of the butterfly valve 15 is shown by a solid line in FIG.
5 is 0% to 100%, the flow rate (Cv value) of the fluid flowing through the butterfly valve 15 is 0% to 1%.
It changes up to 00%. Therefore, in the EEPROM 10,
The butterfly valve 1 is divided into 256 sections by dividing the opening of the butterfly valve 15 from 0% to 100% into 256 sections.
Data of the flow rate of the fluid flowing through the butterfly valve 15
Is stored at address 256 as flow characteristic data corresponding to the opening of the butterfly valve 15 and
Flow characteristics data corresponding to the opening of the butterfly valve 1
5 for each resolution.

The CPU 6 receives an input signal for instructing the opening of the butterfly valve 15 and receives the input signal.
Of the EEPRO in the same manner as the flow rate control of the ball valve 4 in the first embodiment described above.
The flow rate control of the butterfly valve 15 is performed using the flow rate characteristic data corresponding to the opening degree of the butterfly valve 15 and the data of the opening degree deviation in the valve body rotation direction stored in M10.

That is, as shown in FIG. 2, the CPU 6 A / D converts the input signal input from the instruction means in step S1 and checks it by the A / D conversion section 8 to check the instruction opening degree from the instruction means, as shown in FIG. Is determined. CPU
6 is the case where the instruction opening degree is input from the instruction means,
In step S2, from the flow rate characteristic data corresponding to the opening degree for each resolution of the valve stored in the EEPROM 10,
The rotation distance of the valve element required to change the opening degree of the valve 15 from the current opening degree of the valve element to the instruction opening degree of the indicating means is calculated.

Next, in step S3, the CPU 6 determines whether the valve should be moved in the opening direction in order to set the opening of the valve 15 to the indicated opening based on the sign of the rotation distance of the valve obtained by the calculation in step S3. Decide whether to move in the direction. CPU 6
When the valve body is to be moved in the opening direction, the opening position shift due to the rotation direction of the valve body does not occur, so that the rotation distance is not corrected by the valve body rotation direction opening position shift.

If the valve is to be moved in the closing direction, the CPU 6 determines in step S4 that the EEPROM 10
According to the valve body rotation direction opening deviation data stored in
The moving distance obtained by the above calculation is corrected so that the opening position shift due to the rotation direction of the valve body is eliminated.

Here, the butterfly valve 15 has a flow rate characteristic corresponding to the opening as shown by the solid line in FIG. 5, and the dotted line in FIG. 5 shows the flow rate when the opening degree of the butterfly valve 15 is proportional to the flow rate. Show characteristics. The indicated opening is, for example, 25
%, The opening of the valve 15 is shifted by 25 from the current opening.
% Is calculated from the flow rate characteristic data corresponding to the opening for each resolution of the valve.
Is not the flow rate corresponding to the opening degree of 25%, but the movement distance obtained by the calculation is corrected by the valve body rotation direction opening degree shift data so that the opening position shift due to the valve body rotation direction is eliminated. , The flow rate of the valve 15 can be set to a desired flow rate.

Next, the CPU 6 outputs data of the number of pulses corresponding to the corrected moving distance to the motor driving device 5 in step S5. The motor driving device 5 applies pulses to the stepping motor 2 by the number of pulses input from the CPU 6 to rotate the stepping motor 2, and the stepping motor 2 rotates the valve element of the valve 15 via the attenuator 3 to rotate the valve 15. The opening is defined as the indicated opening. Therefore,
The opening degree of the valve 15 is satisfied by the user without deviation due to the flow characteristics of the valve 15 and the operation direction of the valve element.

This second embodiment is another embodiment of the invention according to claim 1, wherein a stepping motor 12 as a driving means for driving a valve element of a valve 15 and an attenuator 13
A motor driving device 14, an instruction means for instructing the drive amount of the valve element, an EPROM 10 as a storage means for storing operating characteristic data of the valve 15, and a drive amount of the valve element indicated by the instruction means. C as arithmetic means for correcting with the operation characteristic data and outputting to the driving means
The provision of the PU 6 makes it possible to eliminate the deviation of the valve opening position due to the characteristics of the valve and the operating direction of the valve element, thereby preventing the fluctuation of the flow rate due to the deviation of the valve opening position and improving the accuracy.

This second embodiment is an embodiment of the invention according to claim 3, and in the valve flow control device according to claim 1, the storage means 10 stores the valve as the operating characteristic data. Since the flow characteristic data corresponding to the 15 degrees of opening is stored, fluctuations in the flow caused by the flow characteristics of the valve can be prevented and accuracy can be improved.

The second embodiment relates to a valve flow control device for controlling the flow rate of a butterfly valve. The storage means 10 further stores flow rate characteristic data corresponding to the opening of another valve other than the Baume valve and the butterfly valve. Alternatively, the opening degree deviation data of the valve body rotation direction may be stored to control the opening degree of another valve. Thus, the storage means 1
0 stores operating characteristic data for each resolution of the valve, and the calculating means 6 calculates the driving amount of the valve body based on the operating characteristic data, whereby various valve characteristics can be realized by one device. Becomes

In the third embodiment and the fourth embodiment of the present invention, the EPROM 10 further includes valves 4 and 15 in the first and second embodiments, respectively.
The correction data for correcting the displacement of the opening positions of the valves 4 and 15 due to the mechanical displacement caused by the operation amount (operating distance, operating speed) of the valve element is stored in advance.

The valve 4 stored in the EPROM 10
Each of the fifteen rotation element opening direction deviation data is the following data as a value converted into the number of pulses for driving the stepping motors 2 and 12 for each movement distance of the valve element.

When the moving distance is up to 10 °, the number of pulses is 47. When the moving distance is more than 10 ° and up to 20 °, the number of pulses is 49. When the moving distance is more than 20 ° and up to 30 °, the number of pulses is 50. If the moving distance is larger than 40 ° and up to 50 °, the number of pulses is 54. If the moving distance is larger than 50 ° and up to 50 °, the number of pulses is 57. If the moving distance is larger than 50 ° and up to 60 °, the number of 57 pulses. The moving distance is larger than 60 °. If the moving distance is greater than 70 ° and is up to 80 °, the number of pulses is 55. If the moving distance is up to 80 °, the number of pulses is 55. In step S4, the CPU 6 uses the valve body rotational direction opening degree deviation data stored in the EPROM 10 to calculate The moving distance obtained by the above calculation is corrected so that the opening position shift due to the rotation direction of the valve body is eliminated.

The correction data of the valves 4 and 15 stored in the EPROM 10 are converted into the following data as values converted into the number of pulses for driving the stepping motors 2 and 12 for each moving distance of the valve body. .

If the moving distance is up to 10 °, the number of 6 pulses. If the moving distance is larger than 10 ° and up to 20 °, 4 pulses.
Number of pulses 2 if the travel distance is greater than 20 ° and up to 30 °
Number of pulses The number of pulses is 0 if the moving distance is 20 ° or more. The stepping motor has a problem in rising, and if the rotation distance of the valve by the stepping motor is a short distance, the opening position of the valve shifts.
Each correction data of the fifteen valve elements is the data as described above.

In the third and fourth embodiments, the CPU 6 executes step S6 before step S5 as shown in FIG. In step S6, the CPU 6 applies the correction data stored in the EPROM 10 to the movement distance obtained by the above calculation (corrected in step S4 when the valve element is rotated in the backward direction (close direction)). The moving distance is corrected by adding the values according to.
Therefore, the displacement of the opening position due to the moving distance of the valve body of the valve is eliminated, and the flow rate of the valve can be controlled with higher accuracy.

The first to fourth embodiments are embodiments of the invention according to claim 2, and in the valve flow control device according to claim 1, the storage means 10
Stores at least one of operating characteristic data for each resolution of the valves 4 and 15, data of the opening degree deviation of the valves 4 and 15 in the valve body rotation direction, and correction data corresponding to the rotation distance of the valve bodies. The means 6 calculates the drive amount of the valve body corresponding to the instruction opening degree of the instruction means based on the data stored in the storage means 10 according to the opening degree instruction of the instruction means and outputs it to the driving means. The displacement of the opening position caused by at least one of the characteristic, the operation direction of the valve element, and the mechanical displacement due to the operation amount can be prevented, and the fluctuation of the flow rate can be prevented, so that the accuracy can be improved. Furthermore, even if the configuration of the valve changes, it can be used.

The third and fourth embodiments are other embodiments of the first and third aspects of the present invention, and are the same as the first and second embodiments. It works.

The present invention is not limited to the above-described embodiment, but includes a device for mixing and supplying a plurality of liquids, a device for cooling and heating by circulating liquids, and a flow rate control for valves used in air conditioners and the like. A device that has a flow rate, temperature,
The present invention can be applied to an apparatus having a sensor for detecting pressure or the like and controlling a valve by a comparison operation between an output of the sensor and a set value. Further, the present invention can be applied to a valve flow control device that controls the flow rate of valves having different flow characteristics, such as a butterfly valve, a ball valve, a globe valve, and a gate valve.

In the present invention, a motor such as a DC motor may be used instead of the stepping motor. In this case, a deviation of the opening position due to the operation direction and the operation amount of the valve element of the valve occurs, so that it is necessary to correct it, and it is necessary to create a valve element rotational direction opening deviation data and correction data by a model.

[0048]

As described above, according to the first aspect of the present invention, the above configuration can prevent the fluctuation of the flow rate caused by the characteristics of the valve and improve the accuracy, and can be used even if the configuration of the valve changes. It is possible to do.

According to the second aspect of the present invention, the above configuration prevents fluctuations in the flow rate caused by at least one of the flow rate characteristics of the valve, the operation direction of the valve element, and the mechanical displacement due to the operation amount, thereby improving the accuracy. It can be used even if the configuration of the valve changes.

According to the third aspect of the present invention, with the above-described configuration, it is possible to prevent the fluctuation of the flow rate caused by the characteristics of the valve and improve the accuracy, and it is possible to use even if the configuration of the valve changes. .

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a flowchart showing an operation flow of the embodiment.

FIG. 3 is a characteristic diagram showing an example of a flow rate characteristic corresponding to an opening degree of a ball valve.

FIG. 4 is a block diagram showing a second embodiment of the present invention.

FIG. 5 is a characteristic diagram showing an example of a flow rate characteristic corresponding to an opening of a butterfly valve.

FIG. 6 is a diagram for explaining the relationship between the rotation direction of the valve and the opening deviation.

FIG. 7 is a diagram for explaining a relationship between a rotation distance of a valve and an opening deviation.

FIG. 8 is a flowchart showing an operation flow according to the third embodiment and the fourth embodiment of the present invention.

[Explanation of symbols]

 2,12 stepping motor 4,15 valve 5,14 motor drive device 6 CPU 10 EPROM

Claims (3)

[Claims] 1. A driving means for driving a valve element of a valve, an instruction means for instructing a driving amount of the valve element, a storage means for storing operating characteristic data of the valve, and the valve indicated by the instruction means. A flow rate control device for a valve, comprising: a calculating means for correcting a driving amount of the body based on the operation characteristic data and outputting the corrected data to the driving means. 2. The valve flow control device according to claim 1, wherein the storage means stores operating characteristic data for each resolution of the valve, data of a deviation in a valve body rotation direction of the valve, and a rotation distance of the valve body. At least one of the corresponding correction data is stored, and the calculating means calculates the driving amount of the valve body corresponding to the indicated opening degree of the indicating means by the opening degree instruction of the indicating means based on the stored data of the storing means. A flow rate control device for a valve. 3. A valve flow control device according to claim 1, wherein said storage means stores flow characteristic data corresponding to an opening degree of said valve as said operation characteristic data. Control device.