JPH09317918A - Manufacture of flow control valve and photosensitive fluid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flow control valve having good linearity to the valve opening and flow rate and capable of controlling flow with high precision covering a wide flow area. SOLUTION: A valve body 31, which is composed of a valve casing 33 and a valve plate 34, has a valve chest 35 provided in its interior and fluid flows therein through an inflow port 36. The valve chest 35 is provided with an opening 37 for the outflow port 37 lengthy in the orthogonal direction to the fluid outflowing direction. The opening 37 has its opening area exposed to the valve chest 35 proportionally increased or decreased correspondingly to the slide moving quantity of a valve stem 32 by the valve stem 32 making a sliding movement with a motor as its driving source and fluid flown inside the valve chest 35 flows out through a fluid outlet in a flow rate proportionated to the opening area.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow control valve and a method for producing a photographic photosensitive solution.

[0002]

2. Description of the Related Art Conventionally, a method of controlling the flow rate of a liquid using a needle valve has been known. However, since the needle valve has no linearity between the flow rate of the liquid flowing out and the valve movement amount, complicated control is required to obtain the linearity. Therefore, in practical use, instead of a needle valve, a pneumatic automatic control valve such as a diaphragm valve or a butterfly valve or an electric automatic control valve such as a ball valve is used as a flow rate control valve (for example, Japanese Patent Laid-Open No. 58-58). 121381).

[0003]

However, even with the above flow control valve, it is difficult to obtain linearity between the valve opening and the flow over a wide flow range. For example,
If the linearity is obtained in the low flow rate range, it becomes difficult to obtain the linearity between the valve opening and the flow rate in the high flow rate range. Further, if the linearity is obtained in the high flow rate range, it becomes difficult to obtain the linearity in the low flow rate range, and further, the resolution of the flow rate control becomes low in the minute flow rate range.

The present invention has been made in order to solve the above problems, and has a good linearity between the valve opening and the flow rate over a wide flow rate range, and the flow rate control is possible even in a minute flow rate range. It is an object of the present invention to provide a small-sized flow rate control valve which has a high resolution, a high-accuracy repeatability, and is easy to control. Another object of the present invention is to provide a method for producing a photographic sensitizing solution capable of producing a high quality photographic sensitizing solution by using this flow control valve.

[0005]

To achieve the above object, in a flow control valve according to a first aspect of the present invention, a valve plate in which an elongated outlet having a constant slit width is formed in a direction orthogonal to the liquid outflow direction. A valve box that forms a valve chamber between the valve plate and the liquid inlet, and is wider than the slit width,
And a valve rod that slides in the longitudinal direction of the outlet in the valve chamber to adjust the opening length of the outlet, and controls the outflow amount of the liquid from the outlet in proportion to the sliding amount of the valve rod. It was done like this.

In the flow control valve according to the second aspect, the valve rod is a cylindrical body having a diameter larger than the slit width of the valve plate.
In the flow rate control valve according to the third aspect, the liquid for controlling the flow rate is any one of a silver ion solution, a halogen ion solution and a coating solution for a photographic light-sensitive material.

According to a fourth aspect of the present invention, there is provided a method for producing a photographic photosensitive solution, wherein a long and narrow outlet having a constant slit width is disposed between the valve plate and the liquid inlet, and the valve plate is oriented in a direction orthogonal to the liquid outflow direction. A valve box having a valve chamber is formed, and a valve rod having a width wider than the slit width is slid in the longitudinal direction of the outlet in the valve chamber by a driving force of a motor to adjust the opening length of the outlet. With the use of a flow control valve that controls the outflow amount of the liquid from the outflow port in proportion to the slide amount of the valve rod,
When controlling the flow rate of at least one of the silver ion-containing solution and the halogen ion-containing solution, the silver ion concentration in the solution in the reaction tank is measured and the flow rate of the solution is controlled by the flow control valve. The flow rate is measured by a flow meter, and the drive of the motor is feedback-controlled based on these measurement results to adjust the opening length of the outlet of the flow rate control valve, thereby the reaction through the flow rate control valve. It controls the flow rate of the solution added to the tank.

[0008]

FIG. 2 shows an example in which the flow control valve of the present invention is used in a photosensitive liquid (emulsion) charging device used for a photographic film or the like. This charging device comprises a KBr solution as an alkali halide solution in a gelatin solution in a reaction tank 10 by a well-known double jet method.
AgNO ₃ solution and an appropriate addition rate, respectively,
Halogen ion (Br ⁻ ) in KBr solution and AgNO
₃ Used to prepare silver halide (AgBr) emulsion by reacting silver ion (Ag ⁺ ) in solution. As the alkali halide solution is not limited to the KBr solution, using NaCl solution, KI solution and the like, Cl ^- and I
^A silver halide (AgCl, AgI) emulsion may be prepared by reacting a halogen ion of-with silver ion, or various kinds of silver halide may be simultaneously produced.

The KBr solution is supplied by a pump 11 from a storage tank (not shown). The KBr solution is added to the gelatin solution in the reaction tank 10 via the flow control valve 12, and the flow rate is measured by the flow meter 13. The AgNO ₃ solution is supplied from the storage tank by the pump 15 and added to the gelatin solution in the reaction tank 10 via the flow control valve 16. Then, the flow rate is measured by the flow meter 17. Each of the flow rate control valves 12 and 16 has its valve opening adjusted via the motors 21 and 22 driven by the control unit 20, and controls the flow rate (addition rate) added to the reaction tank 10 per unit time. . The details of the flow control valves 12 and 16 will be described later.

The flow meter 13 measures the flow rate per unit time of the KBr solution that flows out from the flow rate control valve 12 and is added to the gelatin solution, and sends a KBr flow rate signal corresponding to this flow rate to the control unit 20. Similarly, the flow meter 17 outputs AgNO ₃ which flows out from the flow control valve 16 and is added to the gelatin solution.
The flow rate of the solution per unit time is measured, and an AgNO ₃ flow rate signal corresponding to this flow rate is sent to the control unit 20.

A stirring blade 23 is provided in the reaction tank 10, and a motor 24 is driven to drive the KBr solution and AgNO.
_{3 The} gelatin solution to which the solution has been added is stirred to make the ion concentration (pAg) of silver ions in the gelatin solution uniform.
As a result, AgBr fine particles (crystals) are produced and aged in a gelatin solution having a uniform silver ion concentration.

If the shape (crystal habit) and size of the AgBr fine particles in the prepared emulsion are different, the sensitivity of the photographic film coated with the same and the graininess of the image are different.
The shape and size of r-fine particles change depending on the ion concentration of silver ions in the gelatin solution during generation and ripening. Therefore, a sensor (electrometer) 2 for measuring the ion concentration of silver ions in the gelatin solution is provided in the reaction tank 10.
5 is equipped. The sensor 25 measures the ion concentration of silver ions in the gelatin solution and sends a concentration signal according to the measured ion concentration to the control unit 20.

The control unit 20 detects the ion concentration of silver ions in the gelatin solution based on the concentration signal. And
The valve opening degrees of the flow rate control valves 12 and 16 are determined based on the ion concentrations, and the valve opening degrees of the flow rate control valves 12 and 16 are set via the motors 21 and 22 so as to reach the determined valve opening degrees. Adjust. In addition, the control unit 20 controls each flow meter 1
The addition rates of the KBr solution and the AgNO ₃ solution are detected based on the KBr flow rate signals and the AgNO ₃ flow rate signals from 3, 17 and the valve opening degrees of the flow rate control valves 12, 16 are corrected.
As a result, the ion concentration of silver ions in the gelatin solution in the reaction tank 10 is maintained at a predetermined value.

The valve portion of the flow control valve 16 is shown in FIG.
The valve unit 30 includes a valve body 31 and a cylindrical valve rod 32.
It is composed of The valve body 31 includes a valve box 33 and a valve plate 34 that are in close contact with each other, and a valve chamber 35 is formed between the valve box 33 and the valve plate 34. In the valve box 33,
An inflow port 36 for allowing a liquid (AgNO ₃ solution) to flow into the valve chamber 35 is formed, and the valve plate 34 is provided in the valve plate 34.
An outlet 37 is formed for letting out the liquid that has flowed into 5 and for controlling the flow rate of the liquid that flows out in cooperation with the valve rod 32.

The outlet 37 is located outside the valve plate 34 and in the valve chamber 35.
It is formed so as to expose the elongated rectangular openings 37a and 37b inside. When the opening area of the opening 37b exposed to the valve chamber 35 side is adjusted by the valve rod 32 as described later, the outflow port 37 is unsteady in fluid due to the edge effect at both ends of the exposed opening 37b. In order to suppress the generation of the flow, the longitudinal direction is provided in a direction orthogonal to the direction in which the fluid flows (the direction of arrow A in the figure). As a result, good linearity (proportional relationship) is provided between the valve opening and the flow rate in a wide flow rate range from a minute flow rate to a high flow rate, and high-resolution flow rate control is possible in the minute flow rate range.

The valve chamber 35 is located behind the outlet 37 (the inlet 3
6 side) is a space in which the length in the direction orthogonal to the outflow direction of the liquid is longer than the length L in the longitudinal direction of the outlet 37, and the inlet 36 side is the inlet chamber 41 and the outlet 37 side is the valve slide. It is part 42.

The valve slide portion 42 includes a valve box 33 and a valve plate 34.
Is surrounded by a seal surface (valve seat) 44 formed in the inflow chamber 4
1 is formed as a space connecting the outflow port 37. The valve rod 32 is inserted into the valve slide portion 42 via a sleeve 45 provided on one side surface of the valve body 31,
Inside the valve slide portion 42, it is slidably assembled in the direction along the longitudinal direction of the outlet 37. The valve rod 32 is retracted from the inside of the valve chamber 35 by a moving mechanism to be described later, and the maximum opening position at which the opening 37b is entirely exposed to the inflow chamber 42, and the opening 37b is completely covered so as not to be exposed to the inflow chamber 42. It is slid to an arbitrary position between the closed position (valve opening “0”).

FIG. 3 shows a cross section of the valve portion 30. The sealing surface 44 is formed as a concave surface having the same diameter as the valve rod 32, and the peripheral wall surface of the valve rod 32 and the sealing surface 44 are in close contact with each other. This prevents the liquid filled in the inflow chamber 41 from leaking out to the outflow port 37 from a portion where these are in close contact with each other. Further, by making the height of the opening of the valve slide portion 42 on the inflow chamber 41 side smaller than the diameter of the valve rod 32, the deflection of the tip of the valve rod 32 is prevented, and the peripheral wall surface of the valve rod 32 and the sealing surface 44 are prevented. The close state of is maintained.

The slit width W of the outflow port 37, that is, the opening 37b is smaller than the diameter of the valve rod 32. Accordingly, when the valve rod 32 is slid in the valve slide portion 42, the opening length of the opening 37b exposed to the inflow chamber 42, that is, the opening area is proportionally increased or decreased according to the sliding movement amount. A fluid having a flow rate proportional to the opening area flows out from the outlet 37. As described above, the flow rate control valve 16 can be made compact and the installation space can be reduced because the valve portion 30 has an extremely simple structure.

The surfaces of the valve rod 32 and the seal surface 44 are extremely smooth so that no gap is formed between them. Further, it is preferable that the width W of the outflow port 37 be constant in the longitudinal direction when the processing dimensional accuracy is within 3%. By doing so, linearity between the valve opening and the flow rate can be obtained. You can have it. Further, the valve rod 32 is
The shape is not limited to the cylindrical shape, and may be an elongated plate shape or a prismatic shape, but the cylindrical shape is preferable as described above in consideration of sealing performance and operability.

The valve rod 32 is slid by the moving mechanism shown in FIG. 4 to adjust the valve opening degree in order to ensure highly accurate position reproducibility. The moving mechanism is the control unit 2 described above.
A motor 22 that is controlled by 0 and is, for example, a servo motor
And a ball screw 52a is formed.
a is screwed with the female screw 53a, is connected to the rotary shaft of the motor 22, a connecting plate 53 to which one end of the valve rod 32 and the female screw 53a are fixed, and the guide plate 53 is connected to the shaft 52 (the valve 52). The bar 32) is constituted by a guide bar 54 and the like for restricting the rod 32 to move only in the direction along the axis.

By driving the motor 22 to rotate the shaft 52, the valve rod 32 is slid in either the maximum opening position or the shut-off position depending on the direction of rotation. Accordingly, as shown in FIG. 4A, the valve rod 32 is completely retracted from the valve chamber 35 and the maximum opening position where the opening area exposed to the inflow chamber 42 of the opening 37b is maximized, As shown in FIG. 4 (b), the opening 37 b is formed in the inflow chamber 42.
The valve opening is adjusted by being slid to and from the shut-off position where the opening area exposed to is 0. In addition, the motor 22
Since the slide movement amount of the valve rod 32 is accurately controlled according to the rotation angle of the rotating shaft of, the valve opening degree can be precisely controlled. Further, even when the flow rate is controlled stepwise or continuously, the movement amount of the valve rod 32 is proportional to the rotation angle of the rotation shaft of the motor 22, and the valve opening degree is proportional to this movement amount.
The responsiveness of flow rate control becomes high.

The slide movement of the valve rod 32 is not limited to this configuration, and other configurations may be used as long as the slide movement amount can be accurately controlled. For example,
The rotation angle of the motor may be detected by a rotary encoder, or the rotation of the motor may be converted into linear movement by a rack and pinion mechanism to adjust the valve opening.

Although the material of the valve body 31 and the valve rod 32 is not particularly limited, it is preferable that the valve body 31 and the valve rod 32 have different hardnesses in order to prevent the valve body 31 and the valve rod 32 from being engaged with each other. Further, it is preferable to appropriately select the material in consideration of the prevention of corrosion from the liquid that controls the flow rate and the working accuracy. For example, the combination of the material of the valve rod 32 and the valve case 31 is preferably a combination of ceramic-stainless steel, titanium-ceramic, and stainless steel-hard chrome-plated stainless steel.

Further, the slit width W of the outflow port 37 and the length L of the outflow port 37 can be appropriately changed with the thickness and the length of the valve rod 32 as well as the flow rate range required for control. If the slit width W of the outlet 37 and the length L of the outlet 37 are determined according to the flow rate range required for control, the flow rate can be accurately controlled over a wide flow rate range required for control by one flow control valve. It is possible to In addition, KB
For the flow control valve 12 for the r solution, the flow control valve 16
Since the configuration is the same as that of, the description thereof will be omitted.

Next, the operation of the above configuration will be described. The KBr solution is added to the gelatin solution in the reaction tank 10 through the pump 11, the flow rate control valve 12 and the flow meter 13, and the AgNO ₃ solution is added through the pump 15, the flow rate control valve 16 and the flow meter 17. Halogen ion (Br ⁻ ) and silver ion (Ag ⁺ ) contained in each of these solutions.
React with to produce silver halide (AgBr).

If the concentration of silver ions in the gelatin solution in the reaction tank 10 tends to deviate from a predetermined value based on the concentration signal from the sensor 25, the control unit 20.
Then, the control unit 20 calculates the flow rates of the KBr solution and the AgNO ₃ solution per unit time for keeping the ion concentration of silver ions constant, and determines the flow rate control valves 12 according to the calculation results. , 16 are calculated. Then, the calculated valve opening and the current flow control valves 12, 16
The rotation direction and the rotation angle of the motors 21 and 22 are respectively determined from the valve opening degree and the flow rate of each solution per unit time based on the current flow rate signals from the flow meters 13 and 17.

For example, when the silver ion concentration tends to be higher than a predetermined value, the flow control valve 1
2 is increased to increase the addition rate of the KBr solution, and the flow control valve 17 is further decreased to reduce the valve opening A
The rotation directions and rotation angles of the motors 21 and 22 are determined by reducing the addition rate of the gNO ₃ solution,
Based on this, the motors 21 and 22 are rotated.

In the flow control valve 16 on the AgNO ₃ solution side,
By the rotation of the motor 22, the valve rod 32 is slid toward the shutoff position, and is slid to a position corresponding to the valve opening previously obtained by the control unit 20. As a result, the opening area of the opening 37b exposed to the inflow chamber 42 is reduced to the valve rod 32.
According to the slide movement amount, the valve opening degree is reduced, and the AgNO ₃ solution flowing out from the flow control valve 16 is reduced by this reduction amount. As a result, the flow rate of the AgNO ₃ solution flowing into the reaction tank 10 is reduced.

In this way, the control unit 20 maintains the flow meter 17 while the flow control valve 16 is controlling the predetermined valve opening.
Monitoring the AgNO ₃ flow signal from. Then, although the motor 22 is feedback-controlled based on this signal and the flow control valve 16 is set to the predetermined valve opening, the flow rate of the AgNO ₃ solution becomes the flow rate previously obtained for some reason. If not, the flow control valve 16
The valve opening of is corrected.

At the same time as the addition rate of the AgNO ₃ solution is decreased, the flow control valve 12 is connected to the motor 2
1 is rotated to increase the valve opening degree and increase the flow rate of the KBr solution. Also in this case, the KBr flow rate signal from the flow meter 13 is monitored for the flow rate of the KBr solution, the feedback control of the motor 22 is performed based on this signal, and the valve opening degree of the flow rate control valve 12 is corrected. In this way, the ionic concentration of silver ions in the gelatin solution is maintained at a predetermined value.

On the contrary, when it is determined that the silver ion concentration in the gelatin solution is lower than the predetermined value, the rotation of the motor 22 causes the valve rod 32 to slide toward the maximum opening position and AgNO. _{3 The} flow rate of the solution flowing into the reaction tank 10 is increased. Further, at the same time as the addition rate of the AgNO ₃ solution is increased, the motor 21 is rotated to reduce the valve opening degree of the flow rate control valve 12 and reduce the flow rate of the KBr solution. Also at this time, the flow rates of the KBr solution and the AgNO ₃ solution are monitored by monitoring the flow rate signals from the flowmeters 13 and 17, and the motor 22 is feedback-controlled based on these signals to open the flow control valves 12 and 16. Correct the degree.

When controlling the flow rate as described above, for example, the flow rate control valve 16 is arranged such that the longitudinal direction of the elongated outlet 37 is orthogonal to the outflow direction of each solution, and the valve rod is disposed. Since the occurrence of unsteady flow at the end of the outlet 37 opened at 32 can be suppressed to a low level, the valve opening and the flow rate can be controlled with good linearity, and even if the valve opening is changed repeatedly. With good responsiveness, a stable flow rate can be quickly obtained according to the valve opening. Further, even in the case of controlling the AgNO ₃ solution with a minute flow rate, the minute flow rate can be accurately controlled. Furthermore, since the valve opening is proportionally increased or decreased according to the rotation angle of the motor 22, the flow rate can be easily controlled. For this reason, the flow rate of the AgNO ₃ solution added to the reaction tank 10 can be accurately adjusted with simple control. That is, the control unit 20
Load can be reduced. The flow control valve 1
The same applies to No. 2.

When controlling the valve opening of the flow control valves 12 and 16 based on the measurement by the sensor 25, the flow meter 1
Since the flow rates of the KBr solution and the AgNO ₃ solution are measured at ₃ and 17, and the feedback control is performed based on the measurement result, the flow rates of the KBr solution and the AgNO ₃ solution can be controlled more accurately.

In the above embodiment, AgNO ₃ solution, KB
Needless to say, the flow rate control valve of the present invention can be used for flow rate control of other liquids, which has been described with reference to the example of controlling the flow rate of the r solution or the like. Further, the flow rate control valve of the above-described embodiment has the same inflow direction and outflow direction, but may have a structure in which the liquid flows out in a direction angled with respect to the inflow direction of the liquid.

FIG. 5 shows an example in which the flow control valve of the present invention is used in an emulsion coating device. This emulsion coating device
This is a well-known extrusion type, and an emulsion (coating liquid) supplied by a pump (not shown) is sent to a coating head 63 via a flow rate control valve 61 and a flow meter 62. The coating head 63 pushes out the emulsion from its tip to coat the thin emulsion layer 64a on the film base 64 of the photographic film conveyed at a predetermined speed. The flow rate control valve 61 has the same configuration as that of the above-described embodiment, and the motor 61b
Is used as a power source to adjust the valve opening of the valve unit 61a,
The flow rate of the emulsion supplied to the coating head 63 is adjusted. The flow meter 62 measures the flow rate of the emulsion supplied to the coating head 63. The control unit 65 adjusts the valve opening degree of the flow rate control valve 61 based on the measurement result so that the flow rate of the emulsion supplied to the coating head 63 becomes a constant value according to the transport speed of the film base 64.

By using the flow rate control valve 61 of the present invention in such an emulsion coating apparatus, the flow rate of the emulsion supplied to the coating head 63 can be adjusted with high precision by simple control by the control unit 65. And film base 6
It is possible to form the emulsion layer 64a having a uniform thickness on the No. 4 substrate. Although this coating apparatus forms one emulsion layer, it may be a coating apparatus that coats a plurality of layers at the same time, and it goes without saying that it can also be applied to coating apparatuses of other systems such as a curtain system. Absent.

[0038]

EXAMPLE The flow rate control valve of the present invention configured as described above was used in a system using a metering pump, the valve opening was changed, and the relationship between the flow rate flowing out from the outlet and the valve opening was measured. Water was used as the fluid for controlling the flow rate, and the control range of the flow rate was 0 to 10 Liters / min. A graph of this measurement result is shown in FIG. As a comparative example, a conventional commercially available diaphragm-type controller valve was used in the same system and the relationship between the valve opening and the flow rate was examined. The graph of this measurement result is shown in FIG.

The slit width W at the outlet is 2 mm,
The length L of the outlet in the longitudinal direction is 150 mm, but the slit width is in the range of 0.1 mm to 10 mm, preferably 0.
It can be appropriately changed within a range of 3 mm to 5 mm.
In the graph of FIG. 6, the valve opening is “0%” when the valve stem completely blocks the opening of the outlet on the valve chamber side, and the valve stem is exposed to the inlet chamber by completely opening the opening of the outlet. The opening length is 150
The valve opening degree of "100%" is defined as a value in mm, and the valve opening degree during that time is expressed as a percentage of the ratio of the length of the opening exposed to the inflow chamber to 150 mm.

As shown in FIGS. 6 and 7, in the diaphragm type control valve, a straight line cannot be obtained between the valve opening and the flow rate, and it is difficult to control the minute flow rate range. The flow rate control valve of the present invention has a very good linearity between the valve opening and the flow rate from the minute flow rate to the entire region. At this time, it was confirmed that the flow rate control valve of the present invention can control the flow rate with a resolution of 0.05 Liter / min.

Further, using the above flow rate control valve, the valve opening degree was alternately changed to 25% and 50% repeatedly 100 times, and the variation of the flow rate was measured. Similarly, with respect to the diaphragm type control valve, the valve opening degree was alternately changed to 25% and 50% for 100 times, respectively, and the variation in the flow rate was measured. From these measurement results, it was confirmed that the diaphragm type control valve has an average flow rate variation of about 3%, whereas the flow rate control valve of the present invention has an average variation of 1% or less.

As can be seen from these measurement results, the flow rate control valve of the present invention has extremely good linearity between the valve opening and the flow rate, and also has high-precision repeatability, and accurately controls the flow rate. It turns out that is possible. Furthermore, it can be seen that the flow rate can be controlled with high resolution.

[0043]

As described above in detail, according to the present invention, the valve plate is formed with the elongated outlet having a constant slit width in the direction orthogonal to the outflow direction of the liquid, and the valve chamber is formed as the valve plate. A valve rod that is formed between the liquid inlet and wider than the slit width of the valve plate is slid inside the valve chamber to adjust the opening length of the outlet and slide the valve rod to adjust the flow. Since the amount of liquid flowing out from the outlet is controlled, good linearity can be obtained between the valve opening and the flow rate.
The flow rate can be controlled with high resolution, and the responsiveness,
The flow rate stability and repeatability are also improved.

Furthermore, since good linearity is obtained in the valve opening and the flow rate, when the flow rate control is performed in combination with a flow meter or the like, the control is simple and the load on the control device can be greatly reduced. it can. Further, since the structure is simple, the size can be reduced and the installation space can be reduced. Further, by appropriately changing the length and width of the opening provided so as to be exposed on the valve chamber side of the outlet, one flow control valve can accurately control the flow rate in a wide flow rate range. Is possible.

[Brief description of drawings]

FIG. 1 is a cutaway view showing a valve portion of a flow control valve embodying the present invention.

FIG. 2 is a schematic view showing a charging device using the same flow rate control valve.

FIG. 3 is a sectional view showing a section of a flow control valve.

FIG. 4 is an explanatory diagram showing a valve unit and a moving mechanism of a flow control valve.

FIG. 5 is a schematic view showing an example in which the flow control valve embodying the present invention is used in an emulsion coating apparatus.

FIG. 6 is a graph showing the relationship between the valve opening and the flow rate of the flow control valve of the present invention.

FIG. 7 is a graph showing the relationship between the valve opening and the flow rate of a conventional diaphragm type control valve.

[Explanation of symbols]

 10 Reaction Tank 12, 16, 61 Flow Control Valve 13, 17, 62 Flow Meter 20 Control Unit 21, 22 Motor 25 Sensor 31 Valve Case 32 Valve Bar 33 Valve Box 34 Valve Plate 37 Outlet 37b Opening 44 Sealing Surface

Claims (4)

[Claims] 1. A valve plate in which an elongated outlet having a constant slit width is formed in a direction orthogonal to a liquid outflow direction, and a valve box forming a valve chamber between the valve plate and the liquid inlet. A valve rod that is wider than the slit width and that slides in the longitudinal direction of the outlet in the valve chamber to adjust the opening length of the outlet, and controls the amount of liquid flowing out from the outlet. A flow control valve that is controlled in proportion to the slide amount of the valve rod. 2. The flow control valve according to claim 1, wherein the valve rod is a cylindrical body having a diameter equal to or larger than the slit width. 3. The flow control valve according to claim 1, wherein the liquid is any one of a solution containing silver ions, a solution containing halogen ions, and a coating solution for a photographic light-sensitive material. 4. An elongated outlet having a constant slit width has a valve plate oriented in a direction orthogonal to a liquid outflow direction, and a valve box forming a valve chamber between the valve plate and the liquid inlet. By the driving force of the motor, a valve rod wider than the slit width is slid in the valve chamber in the longitudinal direction of the outflow port to adjust the opening length of the outflow port so that the outflow amount of the liquid from the outflow port is adjusted. A flow control valve that controls in proportion to the slide amount of the valve rod is used to control the flow rate of at least one of the silver ion-containing solution and the halogen ion-containing solution to be added to the reaction tank to generate a photographic photosensitive solution. In the method for producing a photographic photosensitive solution, the silver ion concentration in the solution in the reaction tank is measured, and the flow rate of the solution whose flow rate is controlled by the flow rate control valve is measured with a flow meter. Based on the above The flow rate of the solution added to the reaction tank through the flow rate control valve by controlling the opening length of the outlet of the flow rate control valve by feedback control of the drive of the flow control valve. A method for producing a photographic photosensitive solution.