JPH06161563A - Automatic pressure control valve - Google Patents

Abstract

PURPOSE:To provide the automatic pressure control valve which can provide sufficient pressure at a valve element and improves manufacture efficiency even when second-order side pressure reaches prescribed pressure. CONSTITUTION:A non-bleed type automatic pressure control valve 20 is formed by providing a pressure diaphragm 222 for moving a valve element 212 in the closing direction while being engaged with the valve element 212 and receiving the second-order side pressure and a diaphragm motor 230 for energizing the valve element 212 in the opening direction. In this case, the engagement between the valve element 212 and the pressure diaphragm 222 is canceled by decompressing an operation diaphragm chamber 223 of the diaphragm motor 230. Thus, the valve element 212 gets pressure such as first-order side pressure and completely closes a port 211. Further, since the port can be completely closed, it is not necessary to work/assemble the valve element 212 or the like with high accuracy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic pressure control valve,
In particular, the present invention relates to a petrochemical plant that handles gases that have a risk of explosion, flammability, toxicity, and the like, and an automatic pressure control valve that can be used in a semiconductor manufacturing process that uses so-called semiconductor gas.

[0002]

2. Description of the Related Art Conventionally, in a petrochemical plant or a semiconductor manufacturing process that handles a gas with a risk of explosion, flammability and toxicity, an automatic pressure adjusting valve has been used to adjust the gas to a predetermined pressure. There is. As such an automatic pressure control valve, there is a pressure reducing valve having a spring for balancing the secondary pressure, and the like, and FIG. 8 shows an example of a mechanical pressure reducing valve.

In FIG. 8, a pressure reducing valve 50 is provided inside with a valve body 52 that opens and closes a port 51 that connects the primary side and the secondary side. The valve body 52 is ported by the coil spring 53.
It is biased in the closing direction with respect to 51, and is biased in the opening direction by a coil spring 54 provided on the opposite side of the port 51. A diaphragm 55 is interposed between the valve body 52 and the coil spring 54. The diaphragm 55 compresses the coil spring 54 when the secondary pressure is applied to move the valve body 52 in the closing direction.

With such a structure, the biasing force of the coil spring 54 and the force applied to the diaphragm 55 are balanced to obtain a secondary pressure of a predetermined magnitude. That is, when the secondary pressure is large and the pressing force applied to the diaphragm 55 exceeds the biasing force of the coil spring 54,
The port 51 is closed and the pressure reducing valve 50 operates so as to reduce the pressure. On the contrary, the secondary pressure is small,
When the biasing force of the coil spring 54 exceeds the pressing force applied to the diaphragm 55, the port 51 is opened and the pressure reducing valve is opened.
The 50 is designed to work in the direction of increasing pressure.

[0005]

In such a pressure reducing valve, the pressure on the secondary side and the biasing force of the coil spring 54 oppose each other in the equilibrium state, so that the force for pressing the valve body 52 toward the port 51 side is sufficient. I can't get it. Therefore, even if the secondary pressure reaches a predetermined pressure and it is necessary to stop the flow of gas in order to suppress the increase in the secondary pressure, a sufficient pressing force against the rigidity of the diaphragm is applied. Since it does not join the body 52, the valve 51 cannot completely close the port 51, which may cause a so-called outflow phenomenon in which gas leaks to the secondary side to increase the secondary pressure.

Further, in order to prevent the outflow phenomenon, it is necessary to make the valve body 52 evenly contact the entire circumference of the port 51. Therefore, the valve stem 56 protruding from the valve body 52 toward the diaphragm 55 must always be in contact with the surface of the diaphragm 55 vertically, and high precision is required for its processing and assembly. There is a problem that it becomes complicated and the manufacturing efficiency is poor.

An object of the present invention is to provide an automatic pressure adjusting valve which can obtain a sufficient pressing force on a valve body even when the secondary side pressure reaches a predetermined pressure and has a high manufacturing efficiency.

[0008]

According to the present invention, a valve body is closed except for a fluid inlet / outlet, a biasing means for biasing a valve body incorporated in the valve body in an opening direction, and the valve body. A non-bleed type automatic pressure adjusting valve having a pressure receiving means for engaging and receiving a secondary pressure to move the valve element in a closing direction, wherein engagement between the valve element and the pressure receiving means is released. It is characterized in that a releasing means is provided.

Here, a diaphragm or the like can be adopted as the pressure receiving means, and in this case, the releasing means is engaged with the diaphragm motor which moves the diaphragm in the direction away from the valve body, or both the diaphragm and the valve body. It is possible to employ a structure including an engaging member that is movable between two positions, i.e., a position to be opened and a position to be separated from both the diaphragm and the valve body.

[0010]

In the present invention as described above, when the secondary side pressure reaches the predetermined pressure, the releasing means releases the engagement between the valve body and the pressure receiving means. As a result, the valve element is released from the force urging in the opening direction, deviates from the equilibrium state, and is pressed by the primary pressure or the like to completely close the port.

Further, since the engagement between the valve body and the pressure receiving means is released, the portion such as the valve stem provided on the valve body for engaging with the pressure receiving means such as the diaphragm is also separated from the surface of the diaphragm or the like. Since it is not necessary to always abut the pressure receiving means vertically to completely close it, high precision is not required for its processing and assembly, thereby achieving the above object.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an automatic pressure adjusting device 1 according to the first embodiment of the present embodiment.
Is for adjusting the high-pressure gas in the tank 2 to a predetermined pressure.

The automatic pressure adjusting device 1 includes a control unit 10 for controlling the pressure of high pressure gas, an automatic pressure adjusting valve 20 for adjusting the pressure of the gas to a predetermined pressure, and a pressure upstream of the automatic pressure control valve 20. A primary pressure gauge 3 for displaying and a pressure sensor 4 as pressure detecting means for detecting the pressure on the downstream side of the automatic pressure control valve 20 are provided.

The control unit 10 is a control means for controlling the automatic pressure regulating valve 20 based on the pressure detected by the pressure sensor 4,
A pressure generator 11 that generates an air pressure for driving the automatic pressure control valve 20, and a control device 12 that controls the pressure generator 11.
And have.

The pressure generator 11 compresses air with the compressor 13 and stores the compressed air obtained in the tank 14 to enable stable gas supply.

A nozzle 15 is connected to the tank 14 of the pressure generator 11, and the tip portion of the nozzle 15 is installed inside the chamber 16. The chamber 16 has two outlets 16A, 16B
Is provided. One of the discharge paths 16A is arranged near the outlet of the nozzle 15 and extends along the traveling direction of the air blown from the nozzle 15. A servo valve 17 that opens and closes according to a signal from the control device 12 is connected to the tip of the discharge passage 16A, and the air flowing inside the discharge passage 16A can be blocked by a signal from the control device 12.

When the servo valve 17 is closed, the air blown from the nozzle 15 is accumulated in the chamber 16, so that a positive pressure is generated in the other exhaust passage 16B. When the servo valve 17 is opened, the air blown from the nozzle 15 attracts the air in the chamber 16 and discharges it from the exhaust passage 16A to the outside, so that a negative pressure is generated in the exhaust passage 16B. The opening of the servo valve 17 changes continuously from fully open to fully closed.By changing the opening of the servo valve 17, the pressure in the exhaust passage 16B changes from the negative pressure range to the positive pressure range. It is possible to change continuously up to the area.

The controller 12 compares the pressure value of the pressure sensor 4 and the setting value of the setting device 18 for determining the setting value of the secondary pressure to be controlled, and the pressure value is set. A controller 19 for outputting a signal to the servo valve 17 when the value becomes higher than the value is provided.

FIG. 2 shows the mechanical structure of the automatic pressure regulating valve 20. In the figure, the automatic pressure control valve 20 is of a so-called non-bleed type. Automatic pressure control valve 20
Includes a valve body 210 in which gas flows inside and is closed except for the gas inlet / outlet, a bonnet 220 installed on the upper part of the valve body 210 in the figure, and a diaphragm motor installed on the upper side of the bonnet 220 in the figure. 230 is equipped.

The valve body 210 is of a columnar shape having a recess 210A on almost the entire upper surface in the figure. Inside the valve body 210, there is provided a port 211 for communicating the primary side and the secondary side, and a valve body 21 for closing the port 211 is provided.
2 is provided so that it can move up and down in the figure. A ring-shaped abutment portion 213 is provided on the peripheral edge of the port 211 on the valve body 212 side, the contact portion 213 having a triangular cross-section.

The valve body 212 is a stepped portion whose bottom side in the drawing is thin.
It has a cylindrical shape having 214. Port 21 of valve body 212
A ring-shaped groove 215A is provided on the end face on the first side. A ring-shaped elastic member 215 is fitted in the groove 215A. At the center of this ring-shaped groove 215A,
Stem that protrudes through valve 211 to the top of valve body 210
216 are provided. Here, the valve body 212 has a stepped portion 21.
The valve body 212 is urged toward the port 211 by the urging force of the coil spring 217 fitted in the elastic member 215.
Is pressed against the contact part 213 on the port 211 side and comes into close contact,
No gas leaks when closed.

The bonnet 220 is in the shape of a pan that bulges outward and has a through hole 221 at the top of the bulge. The bottom surface of the bonnet 220 is covered with a pressure receiving diaphragm 222 which is a pressure receiving means for receiving the secondary pressure. By fixing the bonnet 220 to the valve body 210 with bolts, etc., the pressure receiving diaphragm 222 and the recess of the valve body 210
A pressure receiving diaphragm chamber 223 is formed between the pressure receiving diaphragm chamber 223 and 210A.

The pressure receiving diaphragm 222 is a circular disc made of stainless steel. A thick disk 224 is provided at the center of the pressure receiving diaphragm 222.
A rod 225 extending through the through hole 221 to the inside of the diaphragm motor 230 is provided in the central portion of the. The tip of the stem 216 of the valve body 212 is engaged with the central portion of the surface of the disk 224 opposite to the surface having the rod 225.

The diaphragm motor 230 includes an operating diaphragm 232 inside a case 231 formed in the shape of a hollow disk.
Is installed. The inside of the diaphragm motor 230 is partitioned into two spaces by the operation diaphragm 232, and the upper part of the drawing is the operation diaphragm chamber 233 to which the air pressure for operation is applied. A tip portion of a rod 225 extending from the pressure receiving diaphragm 222 is joined to a central portion of the operation diaphragm 232.

When the operation diaphragm chamber 233 is pressurized, the diaphragm motor 230 generates a force for pushing the rod 225 downward in the drawing. As a result, the diaphragm motor 230 constitutes an urging means for urging the valve body 212 away from the port 211 via the pressure receiving diaphragm 222, that is, in the opening direction, as shown in FIG. . The biasing force of the diaphragm motor 230 is
It changes according to the air pressure applied from the control unit 10. This air pressure is adjusted by the control unit 10 based on the secondary pressure detected by the pressure sensor 4.

On the other hand, when the pressure in the operation diaphragm chamber 233 is reduced, the diaphragm motor 230 is set in the pressure receiving diaphragm 22.
A force is generated that pulls 2 upward in the figure and separates it from the valve body 212. As a result, the diaphragm motor 230 is moved to the position shown in FIG.
As shown in FIG. 5, a releasing means for releasing the engagement between the pressure receiving diaphragm 222 and the valve body 212 is configured.

In this embodiment as described above, when the secondary pressure is equal to or lower than the predetermined pressure, the control unit 10 causes the automatic pressure adjusting valve 20 to operate.
A positive pressure is supplied to the diaphragm motor 230, and the valve body 212, which is pressed in the closing direction by the secondary pressure, is urged in the opening direction by the diaphragm motor 230. This allows
The valve body 212 approaches the port 211 according to the magnitude of the secondary pressure, and the port 211 is adjusted so that the secondary pressure becomes a predetermined pressure.
The opening degree of is adjusted.

On the other hand, when the secondary side pressure reaches a predetermined pressure, the control unit 10 supplies a negative pressure to the diaphragm motor 230 of the automatic pressure control valve 20 to separate the pressure receiving diaphragm 222 and the valve body 212. To disengage each other. As a result, the valve body 212 completely closes the port 211 by the biasing force of the coil spring 217 and the primary pressure. When the secondary pressure drops below a specified pressure, the control unit
10 immediately supplies a positive pressure to the automatic pressure control valve 20, and the adjustment of the secondary pressure is promptly restarted.

According to this embodiment as described above, the following effects can be obtained. That is, when the secondary side pressure reaches a predetermined pressure, the engagement between the pressure receiving diaphragm 222 and the valve body 212 is released, and the antagonistic state of the force applied to the valve body 212 is also released. Therefore, the urging force of the coil spring 217 and the pressure of the primary side pressure allow the valve body 212 to completely close the port 211, so that the gas supplied to the primary side leaks to the secondary side at the time of closing. It is possible to prevent a so-called outflow phenomenon that raises the secondary pressure.

Further, since the pressure receiving diaphragm 222 and the valve body 212 are separated so that the port 211 is completely closed, the stem of the valve body is always brought into contact with the pressure receiving diaphragm in a vertical direction as in the prior art. There is no need. Therefore, the stem 216 does not always have to be vertically abutted against the pressure receiving diaphragm 222, and the processing of the stem 216 and the valve body 212 are eliminated.
No high precision is required for the assembly, and the manufacturing efficiency of the automatic pressure control valve 20 can be improved.

Further, the rod of the pressure receiving diaphragm 222 is supplied by the diaphragm motor 230 to which both positive and negative pressures are supplied.
Since the 225 is driven, the pressure receiving diaphragm 222
The engagement and disengagement with the valve element 212 is promptly performed, the controllability is improved, and the secondary side pressure can always be controlled to be stable even if the gas pressure, the supply amount, or the like changes.

Further, since the pressure receiving diaphragm 222 is separated from the valve element 212 by moving in the same direction as the moving direction of the valve element 212, the pressure receiving diaphragm 222 and the valve element 212 are disengaged from each other. The 230 can be used as both the urging means and the releasing means, and the overall structure of the automatic pressure control valve 20 can be simplified.

Further, a pressure sensor 4 for detecting the secondary side pressure and a control section 10 for performing control based on the pressure detected by the pressure sensor 4 are provided, and a feedback loop is formed by these, so that the pressure fluctuates. Even if it is corrected quickly, the controllability of the secondary pressure can be improved.

FIG. 5 shows a second embodiment of the present invention. In this embodiment, the diaphragm motor 230 in the first embodiment is replaced with a cylinder motor 240. That is, the disc-shaped cylinder 241 having a hollow inside is mounted on the bonnet 220 on the upper side of the valve body 210. A piston 242 is provided inside the cylinder 241 so as to be vertically movable in the figure. A tip of a rod 225 extending from the pressure receiving diaphragm 222 is joined to the piston 242. A piston ring 243 made of an elastic member such as rubber is fitted on the peripheral surface of the piston 242. As a result, by pressurizing / depressurizing the pressurizing chamber 244 above the piston 242 in the figure, the pressure receiving diaphragm 222 is engaged / separated from the valve body 212.

Also in this embodiment, the first
In addition to the same actions and effects as those of the embodiment, the cylinder motor 240 can set the use limit pressure higher than that of the diaphragm motor 230, so that the effect that it can be used for higher pressure gas can be added.

The present invention is not limited to the above-mentioned embodiments, but includes the following modifications and the like. That is, the operation means is not limited to a single-acting type in which the diaphragm chamber and the pressure chamber are provided only on one side of the diaphragm and the piston, but the diaphragm chamber and the pressure chamber are provided on both sides of the diaphragm and the piston.
A double-acting type driven by supplying fluid to one side and discharging the fluid from the other side may be used.

The operating means is not limited to the pneumatic type, but may be, for example, an electric type or a hydraulic type. However, if the operating type is pneumatic, the whole structure can be made easy and the flammability is high. Alternatively, it is possible to easily obtain the explosion-proof property required when used for a gas having a strong explosive property.

Further, the releasing means and the operating means are not limited to those which also serve as the releasing means composed of the diaphragm motor 230 or the cylinder motor 240 and the operating means, and may be separate bodies. For example, a coil spring for urging the valve body in the direction away from the port via the pressure receiving diaphragm is provided as an operating means, and a pneumatic actuator etc. for moving the pressure receiving diaphragm in the direction away from the valve body is separately provided. This may be used as a releasing means.

Further, the releasing means is not limited to the one for moving the pressure receiving portion in the same direction as the moving direction of the valve body, and for example, as shown in FIGS. 6 and 7, the pressure receiving diaphragm 222 and the valve body 212 are "T" shaped engaging member 250 between
It is also possible to provide an air motor 252 for interposing the protrusion 251 of the engaging member 250 and moving it in a direction intersecting the moving direction of the valve body 212. In this case, the pressure receiving diaphragm 222
As shown in FIG. 6, the valve body is inserted through the engaging member 250.
Engage with 212. Meanwhile, the engaging member 250 is attached to the air motor 252.
7, the protruding portion 251 is separated from the valve body 212, and the engagement between the pressure receiving diaphragm 222 and the valve body 212 is released.

Further, the pressure generator is not limited to the pressure generator 11 in which the tank 14 is provided between the compressor 13 and the nozzle 15, but for example, the tank 14 is omitted and the nozzle 15 is directly connected to the compressor 13. Alternatively, a pressure source such as a high-pressure gas tank may be used instead of the compressor 13, in short, as long as it can generate both negative pressure and positive pressure, the specific structure or form is not limited. .

Further, the port formed in the valve body is not limited to the port 211 having the abutment portion 213 which is raised around the valve body 212 side in a triangular cross section, and for example, there is no rise around the valve body side. A port that comes into surface contact with the valve body may be used, in short, as long as it can be completely closed and leakage does not occur at the time of closing, and its specific shape may be appropriately selected for implementation.

[0042]

As described above, according to the present invention, even if the secondary side pressure reaches a predetermined pressure, it is possible to obtain a sufficient pressing force on the valve element and to improve its manufacturing efficiency. You can

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a configuration of an automatic pressure adjusting device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an automatic pressure control valve of this embodiment.

FIG. 3 is a cross-sectional view showing a state in which the valve body and the operating means of this embodiment are engaged with each other.

FIG. 4 is a cross-sectional view showing a state where the engagement between the valve body and the operating means of the present embodiment is released.

FIG. 5 is a view similar to FIG. 2 showing an automatic pressure control valve according to a second embodiment of the present invention.

FIG. 6 is a view similar to FIG. 3 of a modified example of the present invention.

FIG. 7 is a view similar to FIG. 4 of the same modified example.

FIG. 8 is a view similar to FIG. 2 showing a conventional example.

[Explanation of symbols]

20 Automatic pressure control valve 210 Valve body 212 Valve body 222 Pressure receiving diaphragm 230 as pressure receiving means 230 Diaphragm motor which also serves as operating means and releasing means 240 Cylinder motor 250 which serves as operating means and releasing means 250 Engagement constituting releasing means Member 252 Air motor constituting release means

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] November 26, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

With such a structure, the biasing force of the coil spring 54 and the force applied to the diaphragm 55 are balanced to obtain a secondary pressure of a predetermined magnitude. That is, when the secondary pressure is large and the pressing force applied to the diaphragm 55 exceeds the biasing force of the coil spring 54,
Port 51 is closed and pressure reducing valve 50 stops the supply of secondary pressure.
It is designed to work in the direction of closing . On the contrary, when the secondary pressure is small and the biasing force of the coil spring 54 exceeds the pressing force applied to the diaphragm 55, the port 51 is opened and the pressure reducing valve 50 moves in the direction of increasing the secondary pressure. It is supposed to work.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

The control unit 12 includes setting a setter 18 for determining the set value of the secondary pressure to be controlled is compared with the set value of setter 18 and the pressure value of the pressure sensor 4, the pressure value Value and
And a controller 19 for outputting a signal to the servo valve 17 so as to correct the deviation .

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0022

[Correction method] Change

[Correction content]

The diaphragm motor 230 includes an operating diaphragm 232 inside a case 231 formed in a hollow disk shape.
Is installed. The inside of the diaphragm motor 230 is partitioned into two spaces by the operation diaphragm 232, and the upper part of the drawing is the operation diaphragm chamber 233 to which the air pressure for operation is applied. A tip portion of a rod 225 extending from the pressure receiving diaphragm 222 is joined to a central portion of the operation diaphragm 232. Na
On the side wall of the hood 220, you can see
At the same time, an atmosphere opening hole penetrating the side wall is provided.
This air release hole allows the pressure receiving die inside the bonnet 220 to be
Space between yafram 222 and operating diaphragm 232.
Is atmospheric pressure.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0036

[Correction method] Change

[Correction content]

The present invention is not limited to the above-mentioned embodiments, but includes the following modifications and the like. That is, the biasing means is not limited to the single-acting diaphragm chamber and pressurized chamber and the like are provided only on one side of the diaphragm and the piston, the diaphragm chamber and the pressurizing chamber or the like are provided on both sides of the diaphragm and the piston ,
A double-acting type driven by supplying fluid to one side and discharging the fluid from the other side may be used.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Name of item to be corrected] 0037

[Correction method] Change

[Correction content]

The driving system of the urging means is not limited to the pneumatic type, but may be, for example, an electric type or a hydraulic type, but if the pneumatic type is used, the entire structure can be simplified and the ignition can be performed. It is possible to easily obtain the explosion-proof property required when used for a gas having strong or explosive properties.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0038

[Correction method] Change

[Correction content]

Further, the releasing means and the urging means are not limited to those which also function as the urging means and the releasing means composed of the diaphragm motor 230 or the cylinder motor 240, and may be separate members. For example, with a biasing means which is provided a coil spring for urging in a direction away from the port of the valve body via the pressure-receiving diaphragm, a pneumatic operating device or the like Before moving away the pressure receiving diaphragm from the valve body It may be provided separately and used as the releasing means.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

FIG. 3 is a cross-sectional view showing a state in which the valve body and the urging means of this embodiment are engaged with each other.

[Procedure Amendment 8]

[Document name to be amended] Statement

[Name of item to be corrected] Fig. 4

[Correction method] Change

[Correction content]

FIG. 4 is a sectional view showing a state in which the engagement between the valve body and the urging means of the present embodiment is released.

[Procedure Amendment 9]

[Document name to be amended] Statement

[Correction target item name] Explanation of code

[Correction method] Change

[Correction content]

Cylinder motor that serves the release means and the diaphragm motor 240 biasing means also serves a the releasing means receiving diaphragm 230 biasing means as [Description of Reference Numerals] 20 automatic pressure regulating valve 210 valve body 212 valve body 222 receiving means ─ ─────────────────────────────────────────────────── ──

[Procedure amendment]

[Submission date] December 2, 1993

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0024

[Correction method] Change

[Correction content]

The diaphragm motor 230 includes an operating diaphragm 232 inside a case 231 formed in the shape of a hollow disk.
Is installed. The inside of the diaphragm motor 230 is partitioned into two spaces by the operation diaphragm 232, and the upper part of the drawing is the operation diaphragm chamber 233 to which the air pressure for operation is applied. A tip portion of a rod 225 extending from the pressure receiving diaphragm 222 is joined to a central portion of the operation diaphragm 232. Na
On the side wall of the hood 220, you can see
At the same time, an atmosphere opening hole penetrating the side wall is provided.
This air release hole allows the pressure receiving die inside the bonnet 220 to be
Space between yafram 222 and operating diaphragm 232.
Is atmospheric pressure.

Claims (2)

[Claims] 1. A valve body which is closed except for a fluid inlet and outlet,
It has an urging means for urging the valve body built in the valve body in the opening direction, and a pressure receiving means for engaging the valve body and receiving the secondary side pressure to move the valve body in the closing direction. A non-bleed type automatic pressure adjusting valve, comprising: a releasing means for releasing the engagement between the valve body and the pressure receiving means. 2. The automatic pressure regulating valve according to claim 1, wherein the pressure detecting means for detecting the secondary pressure and the urging force of the urging means are adjusted based on the pressure detected by the pressure detecting means. An automatic pressure regulating valve, characterized in that it is provided with a control means.