KR101915926B1 - Pressure Reducing Valve for Flow and Pressure Control - Google Patents

Abstract

The present invention relates to a pressure reduction valve for control of flow rate and pressure. The present invention provides: a pressure reduction valve body having a fluid inlet, through which a fluid is introduced at a pressure of 30 bar, a fluid opening/closing passage opened and closed to pass and block the fluid of the fluid inlet, and a fluid outlet, through which the fluid that passed through the fluid opening/closing passage is discharged; a pilot valve located at an upper portion of the pressure reduction body and provided with a pilot valve knob configured to set a discharge pressure value through a pilot pipe formed on one side of the interior of the fluid inlet; a plate lifted by a pressure as the fluid introduced according to a set value of the pilot valve flows to a plate operating chamber formed at an upper portion of the pressure reduction body through a plate pipe to be dispersed; a piston configured to reciprocate a disk that interrupts the fluid opening/closing passage upwards and downwards according to an operation of the plate and connected to a lower portion of the plate and an upper portion of the disk; a spring functioning to move the piston to the lower side by using elasticity if the piston is moved upwards by the plate; a disk configured to open the fluid opening/closing passage if the piston is moved upwards by the plate after the spring is coupled to the interior of the disk to close the fluid opening/closing passage; and a relief valve configured to bypass a portion of the fluid that circulates at a lower portion of the plate operating valve to the outside when the fluid is introduced into the plate operating chamber to a fluid pressure set to the pilot valve or more. Accordingly, the present invention has a unique effect of remarkably improving an operation function of the pressure reduction valve and making it possible to easily repair the relief valve.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a pressure reducing valve,

The present invention relates to a pressure reducing valve (also referred to as SRS), and more particularly, to an operation of a reduced pressure valve used in a marine engine generator by smoothly operating a piston through a steel plate method, To a reduced pressure valve for controlling flow rate and pressure, which improves the function and facilitates the maintenance of the relief valve.

Generally, a pressure reducing valve is used in a pressure reducing line of an engine generator for a marine vessel. The pressure of the primary side fluid can be reduced to a constant pressure lower than the pressure of the primary side, There is an automatic adjustment valve. The pressure drops when a fluid goes out from a narrow gap to a large place. The narrower the gap, the greater the degree of decompression. The pressure reducing valve is applied to this principle, and the pressure is reduced by passing the fluid through the wide pipe in the gap between the valve and the valve seat. The method of automatically controlling the gap of the valve according to the pressure is divided into piston type and diaphragm type. If a high pressure fluid flows through the low pressure side due to a failure of the pressure reducing valve in the case of installing a pressure reducing valve, it is dangerous that the equipment on the low pressure side causes a rupture accident. Therefore, a stop valve is provided on the high pressure side of the pressure reducing valve, It is recommended to have a Relief Valve (Saft Valve).

As to the structure and principle of the pressure reducing valve, the pressure reducing valve is largely divided into a direct-acting type and a pilot type. The direct-acting type pressure reducing valve literally uses the pressure of the water flowing into the valve directly to reduce pressure, and the pilot type is a structure to guide the operation of the large-diameter valve in the direct-acting type pressure reducing valve by attaching a direct acting type pressure reducing valve to the large- . Especially, in the case of a pressure reducing valve for water supply, a direct acting type is used, and the operation principle is similar to that of a pneumatic device. That is, a diaphragm, a bellows, or a cylinder is installed on the upper side of the valve, and a disk for opening and closing the valve is connected to the stem and connected to the diaphragm, the bellows, or the piston inside the cylinder. On these drives, in most cases, a spring is installed and an adjustment screw is provided on the spring to adjust the pressure. When the adjustment screw is locked, the spring is compressed and the diaphragm is pressed, which causes the disc to operate and the valve is opened. At this time, when high-pressure water enters the primary side of the valve, that is, the inlet side, the disk is opened to pass through the seat to the secondary side of the valve. When the water continues to flow into the secondary side of the valve, the pressure gradually increases, so that the pressure increases the diaphragm that was opening the valve disc. When the pressure is greater than the force that the upper adjusting screw is compressing the spring, Water will not enter the secondary side. It is the pressure reducing valve that repeats this principle. Therefore, a direct-acting pressure reducing valve can be used not only for water but also for air, gas and oil, but it does not apply to high-temperature fluids such as steam. Of course, it is possible to make a steam pressure reducing valve by using a diaphragm that maintains physical property even at high temperature, but steam is condensed and mainly uses a pilot type.

On the other hand, a pressure reducing valve of Japanese Patent Laid-Open No. 10-2009-0057963 (2009.06.08) has been proposed (refer to FIG. 1 (a)), 10-1764709 (July 1, 2017), a flow rate regulating type pressure reducing valve has been proposed (see FIG. 1 (B)).

However, the technical feature of the proposed [1] is that when the fluid enters the primary inflow hole 3 while waiting in an initial closed state, the fluid moves to the pilot valve 10 side through the pilot pipe 12, The fluid introduced by the discharge pressure value set in step 10 is moved to the diaphragm sealer 14 so that the diaphragm 11 is lowered by the pressure and the piston 9 is lowered to push the disk 6 connected to the lower end thereof The pressure reducing valve 1 is opened and the fluid is discharged to the discharge pressure set through the discharge hole 5 as the disk 6 which was supposedly resiliently supported by the inner surface spring 8 is lowered.

The technical feature of the proposed [2] is that the core technology of the proposed [1] is applied as it is, and in order to solve the problem of the relief valve of [1] .

However, all of the above-mentioned techniques [1] and [2] proposed that the fluid introduced by the discharge pressure value set in the pilot valve moves to the diaphragm seal 14 / working pressure chamber 110 and the diaphragm 11, When the piston (9, 400) descends while being lowered by the pressure and simultaneously the disk (6, 600) connected is pushed out, the disk (6, 600) The problem is that since the material of the diaphragm 11,300 is made of rubber, there is a problem that the rubber pad is worn during curing and the up and down movement of the piston 9,400 can not be properly driven.

In addition, since the disk 6,600 is located on the lower side of the fluid inlet portion 3,101 and the fluid outlet portion 5,103, the description of the proposed [1] and [2] There is a problem in that vibration is generated by the flow of the fluid when the pressure reducing valve is installed and it is difficult to maintain the reduced pressure balance.

Since the relief valve 15,700 and the disc 6,600 of the above-described techniques [1] and [2] are located inside the upper and lower portions of the pressure reducing valve, abnormal pressure inside the diaphragm seal 14 / The upper and lower covers of the pressure reducing valve must be opened at the same time for repairing. In particular, since the relief valve (15, 700) is located inside the pressure reducing valve, maintenance and setting remain difficult.

Accordingly, the present invention proposes a new pressure reducing valve for controlling flow rate and pressure, which overcomes the above problems.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the problems of the prior art, and more particularly, to a pilot valve having a pilot valve having an automatic control function in a conventional manual method and a steel plate The operation of the pressure reducing valve is greatly improved and the maintenance of the relief valve is facilitated by constructing the pressure reducing valve used in the engine for the marine engine that smoothes the operation of the piston by improving the position of the relief valve, Pressure regulating valve for regulating the flow rate and the pressure.

According to an aspect of the present invention, there is provided a pressure reducing valve for regulating a flow rate and a pressure, the pressure reducing valve being used in a marine engine generator and having a fluid inlet (110) And a fluid discharge port (130) for discharging the fluid having passed through the fluid opening / closing passage to 7 bar; A pilot valve 200 disposed at an upper portion of the pressure reducing valve body and having a pilot valve knob 210 for setting a discharge pressure value through a pilot pipe 140 formed at one side of the fluid inlet; A plate 300 that is fluidly introduced by the set value of the pilot valve and is moved by pressure to disperse and move to the plate operation chamber 150 formed on the upper portion of the pressure reducing valve body through the plate pipe 310; A piston 400 connected to a lower portion of the plate and an upper portion of the disk to reciprocate the disk for interrupting the fluid path according to the operation of the plate by the pressure of the fluid introduced through the pilot tube, ; A spring (500) for moving the piston back by elasticity when the piston is moved upward by the plate due to the pressure of the fluid flowing through the pilot tube; A disk (600) that closes the fluid opening / closing passage and opens the fluid opening / closing passage when the piston is moved upward by the plate; And a part of the fluid circulating in the lower portion of the plate operation chamber is bypassed to the outside when flowing into the plate operation chamber at a fluid pressure equal to or higher than the fluid pressure set in the pilot valve, The pilot valve 200 is located at a position where the outlet of the pilot valve is connected to the plate pipe, and the pressure of the fluid controlled by the pilot valve is detected A fluid pressure sensor 220 for transmitting the fluid pressure to the pilot valve knob drive control unit 230 and automatically adjusting the pilot valve knob 210 by comparing the reference value with a reference value based on a signal transmitted from the fluid pressure sensor, The data value detected from the pressure sensor is received and the stepping motor is driven to set the pilot valve to the plate operation chamber (Arduino, 231), which is a single-board microcontroller based on an open source that controls supply of fluid in a pressure state, and a reference value for controlling the pilot valve to supply a fluid in a pressure state set in the plate operation chamber And a stepping motor (233) coupled to the pilot valve knob and adapted to receive the command of the armature to adjust the pilot valve knob, And a pressure regulating valve (230) for regulating flow rate and pressure is configured.

According to another embodiment of the present invention, the plate 300 is made of steel.

According to another embodiment of the present invention, the relief valve 700 is located at a lower portion of the pressure reducing valve body, and when a fluid pressure of 7.7 bar or more is applied to the inside of the plate operation chamber, .

According to another embodiment of the present invention, the pressure-reducing valve for regulating the flow rate and the pressure is characterized by being an open-top type disk.

According to another embodiment of the present invention, the flow regulating valve for regulating the flow rate and the pressure is characterized in that the flow of the fluid is moved in the top-down direction.

The pressure reducing valve for controlling flow rate and pressure of the present invention has the following effects.

A pressure reducing valve for smoothly operating the piston by improving the position of a plate made of a steel material for opening and closing a disc of the pressure reducing valve and a position of a relief valve in accordance with a set value of the pilot valve, By doing so,

(1) The present invention can greatly improve the operation function of the pressure reducing valve by smoothly driving the upward and downward movement of the piston through the steel plate method instead of the diaphragm method of the conventional rubber material.

(2) According to the present invention, in the conventional disk lower open method, the fluid is flowed from the high pressure side to the low pressure side in the downward direction through the disk open method, and the vibration is attenuated by the flow of the fluid in the pressure reducing valve, .

(3) Since the relief valve of the present invention is located at the lower part of the pressure reducing valve body, the upper cover can be removed only when the maintenance of the upper and lower covers is simultaneously performed, thereby facilitating maintenance and saving repair time .

(4) The present invention has a unique effect that the pilot valve knob can be automatically controlled by a drive pressure drive device having a fluid pressure sensor, an Arduino, and a stepping motor, unlike the conventional manual control product.

1 (A) shows a conventional pressure reducing valve and (B) shows a conventional flow rate and pressure adjusting type pressure reducing valve.
2 is a diagram showing a disc close state of the entire technical configuration of a pressure reducing valve for controlling flow rate and pressure according to a preferred embodiment of the present invention;
3 is a view showing a disc open state of the entire technical configuration of a pressure reducing valve for controlling flow rate and pressure according to a preferred embodiment of the present invention;
4 is a block diagram showing a pilot valve knob controller for a flow rate and pressure regulating valve according to a preferred embodiment of the present invention.
FIG. 5 is a view for explaining a plate type (present invention) for a pressure reducing valve for controlling flow rate and pressure according to a preferred embodiment of the present invention, in comparison with a diaphragm type (conventional invention)
FIG. 6 is a view for explaining a disc upper method (present invention) for a pressure reducing valve for controlling flow rate and pressure according to a preferred embodiment of the present invention and a disc lower method (prior invention)
7 is a view for explaining a flow of fluid to a pressure reducing valve for controlling flow rate and pressure according to a preferred embodiment of the present invention,
8 is a view for explaining the maintenance relation of the pressure reducing valve for controlling the flow rate and the pressure according to the preferred embodiment of the present invention,
9 is a view for explaining the position of a relief valve with respect to a pressure-reducing valve for controlling flow rate and pressure according to a preferred embodiment of the present invention,

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, like reference numerals refer to like elements throughout. Although the same reference numerals are used in the different drawings, the same reference numerals are used throughout the drawings. The prior art should be interpreted by itself. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

2 to 9, core technical means of a pressure reducing valve for controlling flow rate and pressure according to a preferred embodiment of the present invention are roughly divided into a pressure reducing valve body 100, a pilot valve 200, a plate 300, (400), a spring (500), a disk (600), and a relief valve (700).

2 and 3, the pressure reducing valve body 100 is a body relating to a pressure reducing valve for controlling flow rate and pressure according to an embodiment of the present invention, and includes a fluid inlet 110 and a fluid opening / A fluid discharge portion 130, a pilot tube 140, a plate operation chamber 150, and a plate operation chamber tube 160, respectively.

The fluid inlet 110 is formed on one side of the pressure reducing valve body 100, and the fluid flows into the pressure reducing valve body 100 at 30 bar.

The fluid passage 120 is formed inside the pressure reducing valve body 100 and communicates with the fluid inlet 110 when the disk 600 is lifted so that the fluid transferred from the fluid inlet 110 .

The fluid discharge part 130 is formed on the other side of the pressure reducing valve body 100 and communicates with the fluid opening and closing passage 120 to reduce the fluid passing through the fluid opening and closing passage 120 to 7 bar, Is discharged. Here, 30 bar of the fluid inlet 110 and 7 bar of the fluid outlet are in accordance with the design of the pressure reducing valve used in the marine engine generator of the present invention, and it is obvious that the variable design can be made if necessary.

The pilot pipe 140 is formed inside the pressure reducing valve body 100 and guides the fluid flowing through the fluid inlet 110 to introduce the fluid into the pilot valve 200.

The plate operation chamber 150 is formed in the interior of the pressure reducing valve body 100 and is located on the upper side of the fluid opener 120. The plate operation chamber 150 is connected to the plate pipe 140 through which the fluid flowing through the pilot pipe 140 is transferred. A space is secured inside the plate 300 so that the plate 300 can move up and down by the dispersed fluid pressure of the plate 310.

The plate operation chamber tube 160 is formed inside the pressure reducing valve body 100 and guides the fluid flowing through the fluid opening and closing passage 120 to the inside of the plate operation chamber 150, The fluid is introduced into the upper portion of the plate 300 so that the disk 600 is closed by the spring 500.

2 to 4, the pilot valve 200 is a means for supplying a part of the fluid flowing through the pilot pipe 140 to a fluid in a pressure state set in the plate operation chamber 150, A pilot valve knob 210, a fluid pressure sensor 220, and a pilot valve knob drive control unit 230.

The pilot valve knob 210 is a means for adjusting the pressure of the fluid flowing into the pilot valve 200 through the pilot pipe 140 to a preset pressure.

Here, the pilot valve knob 210 has a scale mark printed thereon for setting the pressure, and can be manually adjusted by the user or automatically adjusted by the pilot valve knob drive control unit 230.

The fluid pressure sensor 220 is located at a position where the discharge port of the pilot valve 200 is connected to the plate pipe 310 and detects the pressure of the fluid controlled by the pilot valve 200, ).

The pilot valve knob drive control unit 230 automatically adjusts the pilot valve knob 210 by comparing the reference value with a signal transmitted from the fluid pressure sensor 220.

4, the pilot valve knob drive control unit 230 according to the embodiment of the present invention includes an Arduino 231, a RAM 232, and a stepping motor 233, do.

The Arduino 231 is a single-board microcontroller based on an open source and receives data values detected from the fluid pressure sensor 220 to drive the stepping motor 233, And controls the valve 200 to supply the fluid in the pressure state set in the plate operation chamber 150. [

Herein, the Arduino according to an embodiment of the present invention refers to a board and related development tools and environment completed with a single-board microcontroller based on open source. Arduino can accept values from multiple switches and sensors, and control external electronic devices such as LEDs and motors to create objects that can interact with the environment. The device can be controlled using an environment that can easily be developed by one of the embedded systems. It also provides the Arduino Integrated Development Environment (IDE), provides software development and executable code uploads, and works with software such as Adobe Flash, Processing, and Max / MSP. The biggest advantage of the Arduino is that it allows the microcontroller to operate easily. Generally, AVR programming is compiled with AVRStudio (changed to Atmel Studio, ARM tool added) and WinAVR (avr-gcc) or developed with IAR EW or CodeVision, and uploaded through a separate ISP device. It must go through a cumbersome process. In contrast, Arduino can easily upload compiled firmware via USB. And Arduino is relatively inexpensive compared to other modules and supports Windows, Mac OS X and Linux.

The memory (RAM) 232 stores a setting parameter, which is a reference value for controlling the pilot valve 200 to supply the fluid in a pressure state set in the plate operation chamber 150.

The stepping motor 233 is coupled to the pilot valve knob 210 and controls the pilot valve knob 210 in response to an instruction from the Arduino 231.

Here, the stepping motor 233 according to the embodiment of the present invention uses a stepping motor capable of controlling a predetermined rotation angle by a command of a pulse signal.

Also, the pilot valve 200 controls the fluid pressure of 30 bar flowing through the fluid inlet to a fluid pressure of 7 bar.

2 and 3 and 5, the plate 300 is configured to receive a fluid in a pressure state set by the pilot valve 200 through the plate tube 310, And is made of steel in the present invention, unlike the rubber products of the prior art.

The reason why the plate 300 according to the embodiment of the present invention is made of steel is that since the material of the diaphragm 11,300 corresponding to the plate of the present invention in the prior art is made of rubber, So that the up and down movement of the piston 9,400 can not be properly driven.

2 and 3, the operation function of the plate 300 according to the embodiment of the present invention will be described below.

Before the fluid is introduced into the pilot valve 200 through the pilot pipe 140 formed at one side of the fluid inlet 110 in FIG. 2, the plate 300 is divided into upper and lower plate operation chambers 150 And the disk 600 is closed (closed) to the fluid opening / closing path 120.

3, when the fluid flows through the pilot pipe 140 formed at one side of the fluid inlet 110, the fluid in the pressure state set by the pilot valve 200 is supplied through the plate pipe 310, At the same time as the plate 300 is lifted up inside the plate operation chamber 150, the disk 600 is lifted and separated from the fluid opening / closing path 120 to be opened.

2 and 3 and 5, the piston 400 is a means for vertically reciprocating the disk 600 according to the operation of the plate 300, And is connected to the upper portion of the disc 600.

2, 3 and 5, the spring 500 is provided between the piston 400 and the disc 600 as a means for facilitating the action reaction of the piston 400, When the piston 400 is moved upward by the plate 300, the piston 400 moves downward by elasticity.

In other words, when there is no lifting operation of the plate 300, the lifted piston 400 is lowered to keep the disk 600 in the closed state.

2, 3, and 5, the disk 600 is a means for interrupting the fluid path 120, and the spring 500 is coupled to the fluid path 120, When the piston 400 is moved upward by the plate 300, the disk 600 is lifted together to open the fluid opening / closing path 120.

2 and 3 and 5, when the relief valve 700 flows into the plate operation chamber 150 at a predetermined fluid pressure or higher, the relief valve 700 is connected to the lower portion of the plate operation chamber 150, And is located at a lower portion of the pressure reducing valve body 100 to facilitate maintenance.

In addition, the relief valve 700 bypasses the relief valve when a fluid pressure of 7.7 bar or more is applied to the plate operation chamber.

Figure 6 shows an improved disc 600 for a flow regulator and pressure regulating valve according to a preferred embodiment of the present invention.

That is, the item (a) of FIG. 6 represents the disc lower opening method of the existing product, and the item (B) of FIG. 6 represents the disc upper open method which is the developed product of the present invention.

7 is a view for explaining the structure of the pressure reducing valve according to the disk opening method of FIG.

That is, FIG. 7 (A) shows a state in which the flow of the fluid is generated in the upward direction from the bottom according to the disk bottom opening method of FIG. 6 (A), and vibration due to the flow of fluid occurs when the pressure reducing valve is installed, Is difficult.

However, FIG. 7 (B) shows a state in which the flow of the fluid is generated in the top-down direction according to the disk top opening method of FIG. 6 (B), and vibration due to the flow of the fluid does not occur during the installation of the pressure reducing valve, It is easy.

8 is a view for explaining the removal of the upper and lower covers in the maintenance of the pressure reducing valve for controlling flow rate and pressure according to a preferred embodiment of the present invention.

That is, the item (a) of FIG. 8 corresponds to the existing product, and the relief valve which discharges the fluid pressure exceeding the value set by the pilot valve is located inside the upper part of the pressure reducing valve body, The upper and lower covers need to be removed and the upper and lower covers must be removed at the same time during maintenance.

8 (b) is a developed product according to an embodiment of the present invention, in which a relief valve 700 for discharging a fluid pressure equal to or higher than a value set by the pilot valve 200 is positioned below the reduced pressure valve body Since the disk is open at the top, it requires an upper cover, and only the upper cover needs to be removed during maintenance, which makes it easy to maintain and save repair time.

9 is a view for explaining the position of a relief valve with respect to a pressure-reducing valve for controlling flow rate and pressure according to a preferred embodiment of the present invention, in comparison with the prior art.

That is, since the relief valve is located inside the upper part of the body of the pressure reducing valve, the upper cover of the pressure reducing valve must be repaired when an abnormal pressure occurs in the diaphragm chamber / working pressure chamber, There are difficulties in maintenance and setting.

9 (B) is a developed product according to the embodiment of the present invention. Since the relief valve is independently positioned below the pressure reducing valve body 100, the pressure in the plate operation chamber 150 is maintained There is a unique feature that does not have difficulty in maintenance and setting.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the scope of the present invention but to limit the scope of the technical idea of the present invention. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100: Pressure Reducing Valve Body 110: Fluid Inlet
120: Fluid opening / closing passage 130: Fluid outlet
140: pilot tube 150: plate operating chamber
160: Plate operation chamber tube 200: Pilot valve
210: Pilot valve knob 220: Fluid pressure sensor
230: Pilot valve knob controller 231: Arduino
232: memory 233: drive drive
300: plate 310: plate tube
400: piston 500: spring
600: Disk 700: relief valve

Claims (8)

In a pressure-reducing valve for controlling flow rate and pressure,
The pressure reducing valve is used in a marine engine generator and includes a fluid inlet 110 into which fluid flows at 30 bar, a fluid opening and closing passage 120 through which the fluid in the fluid inlet is controlled by opening and closing, And a fluid outlet (130) for discharging the fluid to 7 bar;
A pilot valve 200 disposed at an upper portion of the pressure reducing valve body and having a pilot valve knob 210 for setting a discharge pressure value of a fluid introduced through a pilot pipe 140 formed at one side of the fluid inlet, ;
A plate 300 that is fluidly introduced by the set value of the pilot valve and is moved by pressure to disperse and move to the plate operation chamber 150 formed on the upper portion of the pressure reducing valve body through the plate pipe 310;
A piston 400 connected to a lower portion of the plate and an upper portion of the disk to reciprocate the disk for interrupting the fluid path according to the operation of the plate by the pressure of the fluid introduced through the pilot tube, ;
A spring (500) for moving the piston back by elasticity when the piston is moved upward by the plate due to the pressure of the fluid flowing through the pilot tube;
A disk (600) that closes the fluid opening / closing passage and opens the fluid opening / closing passage when the piston is moved upward by the plate;
And a part of the fluid circulating in the lower portion of the plate operation chamber is bypassed to the outside when flowing into the plate operation chamber at a fluid pressure equal to or higher than the fluid pressure set in the pilot valve, And a relief valve (700)
The pilot valve (200)
A fluid pressure sensor 220 located at a position where the discharge port of the pilot valve is connected to the plate pipe and detecting the pressure of the fluid controlled by the pilot valve and transmitting the pressure to the pilot valve knob drive control unit 230,
The pilot valve knob 210 is automatically controlled by comparing the reference value with a reference value based on a signal transmitted from the fluid pressure sensor. The data value detected from the fluid pressure sensor is received to drive the stepping motor, (Arduino, 231), which is an open-source based single-board microcontroller that controls the supply of fluid in a pressure state set to the plate operation chamber, and the pilot valve And a stepping motor 233 which is coupled to the pilot valve knob and controls the pilot valve knob in response to the command of the armature. And a pilot valve knob drive control unit (230) Adjusting the pressure reducing valve.
delete delete delete The method according to claim 1,
Wherein the plate (300) is made of steel.
The method according to claim 1,
The relief valve (700) is located at a lower portion of the pressure reducing valve body, and when a fluid pressure of 7.7 bar or more is applied to the plate operation chamber, the relief valve is bypassed. valve.
The method according to claim 1,
Wherein the pressure-reducing valve for regulating the flow rate and the pressure is an open-top type disk.
The method according to claim 1,
Wherein the flow regulating valve for regulating the flow rate and the pressure regulates the flow of the fluid upward and downward.

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