JP2009236148A - Pressure control valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure control valve in which its structure is simple, its manufacturing cost is low, and its valve opening is easily adjusted. <P>SOLUTION: The pressure control valve 1 comprises a valve body 2 having valve chambers 2a, 2b inside, valve seats 3 provided inside the valve chambers, and a valve element 4 which contacts and separates from the valve seats. The valve element is made of an elastomer. With the valve element and the valve seats contacted with each other, two spaces 2a, 2b are partitioned and formed inside the valve chambers, and communication of these spaces is interrupted to create a closed state. When pressure of a fluid inside one of the two spaces exceeds a predetermined value, the valve element is elastically deformed, the valve element and the valve seats separate from each other, and the two spaces are communicated to create an open state. Because the valve is opened and closed using the deformation of the elastomer of the valve element (or valve seats or both), the structure becomes simple and the manufacturing cost is suppressed low. Valve opening is easily adjusted by changing the dimensions, material and the like of the elastomer. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a pressure control valve, and more particularly to a pressure control valve used for a refrigeration cycle used for refrigeration and air conditioning.

  Conventionally, in the refrigeration cycle and the like, a pressure control valve is used to control the pressure of a refrigerant or the like. For example, a vapor compression refrigeration cycle that circulates a refrigerant in a sealed circuit constituted by a compressor, a radiator, a pressure control valve (expansion valve), an evaporator, and the like is used for a vehicle air conditioner and the like.

  As an example of a pressure control valve used in the vapor compression refrigeration cycle, Patent Document 1 discloses a body having a refrigerant flow path from an internal heat exchanger to an evaporator via a valve port, A valve seat that is provided, a valve body that is housed in the body and contacts and separates from the valve seat, a diaphragm that is fixed to one end of the valve body, a lid that forms a sealed space above the diaphragm, and a lower support portion; A pressure control valve including a spring mounting portion provided at the other end of the valve body and a spring interposed between the spring mounting portion and the valve seat is described.

  In the pressure control valve having the above configuration, the valve closing force of the valve body is between the internal pressure in the sealed space formed above the diaphragm fixed to one end of the valve body and the spring mounting portion of the valve seat and the valve body. The valve opening force of the valve body is obtained by the pressure of the refrigerant from the internal heat exchanger. The valve closing / opening state is switched according to the balance between the valve closing force and the valve opening force.

JP 2007-139209 A

  However, in the pressure control valve described in Patent Document 1, the valve closing force for the valve body is obtained from two of the internal pressure of the sealed space and the spring interposed between the valve seat and the spring mounting portion of the valve body. The structure is complicated and the manufacturing cost is high.

  There is also a pressure control valve that obtains the valve closing force for the valve body only by a coil spring that urges the valve body in the valve seat direction. However, such a pressure control valve also requires a coil spring and its mounting structure. Thus, there was room for improvement in terms of the valve structure and manufacturing cost.

  Accordingly, the present invention has been made in view of the above-described problems in the prior art, and provides a pressure control valve that is simple in structure, low in manufacturing cost, and can easily adjust the valve opening. For the purpose.

  In order to achieve the above object, the present invention is a pressure control valve, comprising a valve body having a valve chamber therein, a valve seat provided in the valve chamber, and a valve body contacting and separating from the valve seat. One or both of the valve body and the valve seat are made of an elastic body, and in a state where the valve body and the valve seat are in contact with each other, two spaces are defined in the valve chamber. When the communication of the space is cut off and closed, and the pressure of the fluid in one of the two spaces exceeds a predetermined value, either the valve body or the valve seat or both are elastic The valve body and the valve seat are separated from each other, and the two spaces communicate with each other to be in an open state.

  According to the present invention, at least one of the valve body and the valve seat is made of an elastic body, and the valve can be opened and closed by utilizing the deformation of the elastic body. It can be kept low. In addition, the operating pressure and the valve opening can be easily adjusted by changing the dimensions and material of the elastic body.

  In the pressure control valve, the valve body is a thin sealed cylindrical container made of a thin plate, and the valve seat is fixed in the valve chamber and surrounds a circumferential surface of the sealed cylindrical container. And the closed surface is brought into contact with the circumferential surface of the sealed cylindrical container and the inner circumferential surface of the opening of the valve seat, and the pressure of the fluid in one of the two spaces has a predetermined value. If it exceeds, the said valve body will be elastically deformed and it can comprise so that the said valve body and a valve seat may space apart and may be in an open state.

  Further, in the pressure control valve, the valve body includes a columnar portion, the valve seat is formed of a thin plate, includes a cylindrical portion surrounding a circumferential surface of the columnar portion, and the columnar shape of the valve body When the circumferential surface of the portion and the thin plate-like cylindrical portion come into contact with each other, the valve seat is elastically deformed when the fluid pressure in one of the two spaces exceeds a predetermined value. The valve body and the valve seat can be separated from each other and open.

  Further, in the pressure control valve, the valve body is formed of a thin plate, is formed in a cylindrical shape in which one end is closed and the other end is opened, and the valve seat is fixed in the valve chamber, It has an opening that surrounds the circumferential surface of the valve body, the circumferential surface of the valve body and the opening inner peripheral surface of the valve seat are brought into a closed state, and the two spaces, When the pressure of the fluid in the space on the side facing the closed end of the valve body exceeds a predetermined value, the valve body is elastically deformed, and the valve body and the valve seat are separated from each other and opened. It can be constituted so that.

  Moreover, in the pressure control valve, the valve body is a sealed cylindrical container made of a thin plate and having a vacuum inside, and the valve seat is fixed in the valve chamber and surrounds a circumferential surface of the sealed cylindrical container. An opening portion, and the circumferential surface of the sealed cylindrical container and the inner peripheral surface of the opening portion of the valve seat come into contact with each other, and the fluid pressure in one of the two spaces is a predetermined pressure. When the value is exceeded, the valve body and the valve seat are elastically deformed, and the valve body and the valve seat can be separated from each other to be in an open state.

  Further, in the pressure control valve, the valve body is a solid cylindrical body made of an elastic body, and the valve seat is an inner peripheral surface of the valve chamber surrounding the solid cylindrical body, When the outer peripheral surface of the solid cylindrical body and the inner peripheral surface of the valve chamber come into contact with each other, the valve body is closed, and when the pressure of the fluid in one of the two spaces exceeds a predetermined value, the valve body Can be elastically deformed and the valve body and the valve seat can be separated from each other and open.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a first embodiment of a pressure control valve according to the present invention. This pressure control valve 1 is roughly divided into a valve main body 2 (jointly divided into two parts having valve chambers 2a and 2b inside ( 2A, 2B) and a valve body 4 that contacts and separates from the valve seat 3 in the valve chambers 2a, 2b.

  The valve body 2 (2A, 2B) is formed of metal, synthetic resin, or the like, and includes valve chambers 2a, 2b as cylindrical spaces inside, and a distal end surface of a ring-shaped protrusion at the right end of the valve body 2B. Functions as the valve seat 3.

  The valve body 4 is formed in a sealed cylindrical container shape with a thin plate of metal or the like, and the inside of the container is vacuum. The outer peripheral surface of the valve body 4 is in contact with the valve seat 3. The left end portion of the valve body 4 is fixed to the inner peripheral surface of the valve main body 2 </ b> B via the holding member 5.

  The holding member 5 includes a holding portion 5a that holds the left end portion of the valve body 4, and a plurality of leg portions 5b that are continuous with the holding portion 5a and are fixed to the inner peripheral surface of the valve body 2B. The flow path 2d and the valve chamber 2b communicate with each other.

  Next, the operation of the pressure control valve 1 having the above configuration will be described with reference to FIG.

  FIG. 1A shows a state in which the pressure control valve 1 is closed. In this state, since the outer peripheral surface of the valve body 4 is in contact with the valve seat 3, the flow path 2c to the flow path 2d, and the flow path Fluid does not flow in any direction from 2d to the flow path 2c.

  When the pressure of the fluid on the flow path 2c side rises from the state of FIG. 1A and exceeds a predetermined value, the valve body 4 is reduced in diameter by elastic deformation as shown in FIG. A gap is formed between The fluid flows through the gap to the left, through the valve chambers 2a and 2b, toward the flow path 2d, and the pressure control valve 1 is opened. In FIG. 1 (b), in order to make the drawing easier to see, the stepped portions and contour lines of each component of the pressure control valve 1 are omitted, and only a cross section is shown.

  Further, even when the pressure of the fluid on the flow path 2d side increases from the state of FIG. 1A, the valve body 4 is reduced in diameter by elastic deformation and a gap is formed between the valve seat 3 and the valve seat 3 as described above. Therefore, the fluid flows to the right through this gap, flows to the flow path 2c side through the valve chambers 2b, 2a, and the pressure control valve 1 is opened.

  As described above, the pressure control valve 1 opens when the pressure of the fluid on either the flow path 2c side or 2d side exceeds a predetermined value, and can flow the fluid in both directions.

  Next, a second embodiment of the pressure control valve according to the present invention will be described with reference to FIG.

  The pressure control valve 21 is roughly divided into a valve body 22 having a valve chamber 22a therein, a valve body 24 that contacts and separates from a valve seat 23 in the valve chamber 22a, and the like.

  The valve body 22 is formed of metal, synthetic resin, or the like, and includes a valve chamber 22a as a cylindrical space inside, and a valve seat 23 and a valve body 24 are accommodated in the valve chamber 22a. A housing 25 having a flow path 25a is integrated on the left side of the valve body 22, and a housing 26 having a flow path 26a is integrated on the right side. A plurality of through holes 22 b are formed as flow paths at the left end of the valve body 22.

  The valve seat 23 is formed in a cylindrical shape with a thin plate of metal or the like, and is fixed to the valve body 22. An O-ring 27 is interposed between the right end portion of the valve seat 23 and the valve main body 22, and the left end portion of the valve seat 23 abuts on the protruding portion 22 c of the valve main body 22. A cylindrical gap 29 is formed between the outer peripheral surface of the valve seat 23 and the inner peripheral surface of the valve main body 22, and the gap 29 communicates with the flow path 25a through the through hole 22b.

  The valve body 24 is generally formed in a substantially cylindrical shape from metal, synthetic resin, or the like, and is in contact with the inner peripheral surface of the valve seat 23 at the large-diameter portion 24a on the right side. The portion excluding the large diameter portion 24a of the valve body 24 is formed in a cylindrical shape having the same diameter, but is not a complete cylinder, and a plurality of cutout portions 24b are formed, and the cutout portions 24b communicate with the valve chamber 22a. .

  The housing 25 is made of metal, synthetic resin, or the like, and a cylindrical space having a large diameter and a small diameter is formed as a flow path 25a therein. The large-diameter-side flow path 25a is a space continuous with the valve chamber 22a and communicates with the gap 29 through the through hole 22b.

  The housing 26 is formed of metal, synthetic resin, or the like, and a cylindrical and frustoconical space is formed therein as a flow path 26a. The flow path 26a constitutes a space continuous with the valve chamber 22a.

  Next, the operation of the pressure control valve 21 having the above configuration will be described with reference to FIG.

  FIG. 2A shows a state in which the pressure control valve 21 is closed. In this state, the large-diameter portion 24a of the valve body 24 is in contact with the inner peripheral surface of the valve seat 23. The fluid does not flow in any direction from the channel 26a and the channel 26a to the channel 25a.

  When the pressure of the fluid on the flow path 26a side rises from the state of FIG. 2 (a) and exceeds a predetermined value, the valve seat 23 is elastically deformed outward and expanded as shown in FIG. 2 (b). A gap is formed between the inner peripheral surface of the valve seat 23 and the large diameter portion 24 a of the valve body 24. Through this gap, the fluid flows to the left, through the notch 24b of the valve body 24, toward the flow path 25a, and the pressure control valve 21 is opened. In FIG. 2 (b), in order to make the drawing easier to see, stepped portions and contour lines of each component of the pressure control valve 21 are omitted, and only a cross section is shown.

  On the other hand, when the pressure of the fluid on the flow path 25a side increases from the state of FIG. 2A, the fluid pressure in the notch 24b of the valve body 24 and the like increases through the flow path 25a, but the flow path 25a Is communicated with the gap 29 via the through-hole 22b, the fluid pressure in the gap 29 is also increased, and the outer peripheral surface of the valve seat 23 is pressed toward the valve body 24 by this fluid pressure. The inner peripheral surface of the valve seat 23 and the large diameter portion 24a of the valve body 24 are not separated from each other. Therefore, the closed state of the pressure control valve 21 is maintained.

  As described above, as shown in FIG. 2B, the pressure control valve 2 opens when the fluid pressure on the flow path 26a side exceeds a predetermined value, and as shown in FIG. Since the fluid does not flow from the flow path 25a to the flow path 26a and the closed state can be maintained, it also functions as a check valve. In FIG. 2 (c), in order to make the drawing easier to see, the stepped portions and contour lines of each component of the pressure control valve 21 are omitted, and only the cross section is shown.

  Next, a third embodiment of the pressure control valve according to the present invention will be described with reference to FIG.

  The pressure control valve 41 is roughly divided into a valve body 42 (42A, 42B) in which two parts having valve chambers 42a, 42b are joined, and a valve seat 43 in the valve chambers 42a, 42b. It consists of a valve body 44 and the like.

  The valve main body 42 (42A, 42B) is formed of metal, synthetic resin, or the like, and includes valve chambers 42a, 42b as cylindrical spaces therein, and the front end surface of the ring-shaped protrusion at the right end of the valve main body 42B. Functions as the valve seat 43.

  The valve body 44 is formed in a cylindrical container shape whose right end is closed with a thin plate of metal or the like. The outer peripheral surface of the valve body 44 is in contact with the valve seat 43. The left end portion of the valve body 44 is opened to the valve chamber 42b and is fixed to the inner peripheral surface of the valve main body 42B via the holding member 45.

  The holding member 45 is formed in a holding portion 45a that holds the left end portion of the valve body 44, a plurality of leg portions 45b that are continuous with the holding portion 45a and are fixed to the inner peripheral surface of the valve body 42B, and a holding portion 45a. The passage 42d and the valve chamber 42b communicate with each other through the leg 45b.

  Next, the operation of the pressure control valve 41 having the above configuration will be described with reference to FIG.

  FIG. 3A shows a state in which the pressure control valve 41 is closed. In this state, since the outer peripheral surface of the valve body 44 is in contact with the valve seat 43, the flow path 42c to the flow path 42d, and the flow path Fluid does not flow in any direction of the flow path 42c from 42d.

  When the pressure of the fluid on the flow path 42c side increases from the state of FIG. 3A and exceeds a predetermined value, the valve body 44 is reduced in diameter by elastic deformation as shown in FIG. A gap is formed between The fluid flows through the gap to the left, through the valve chambers 42a and 42b, toward the flow path 42d, and the pressure control valve 41 is opened. Note that, in FIG. 3B, in order to make the drawing easier to see, stepped portions and contour lines of each component of the pressure control valve 41 are omitted, and only a cross section is shown.

  On the other hand, when the pressure of the fluid on the flow path 42d side increases from the state shown in FIG. 3A, the fluid pressure inside the valve chamber 42b and the valve body 44 increases through the flow path 42d and the through hole 45c. The fluid pressure presses the outer peripheral surface of the valve body 44 toward the valve seat 43, so that the outer peripheral surface of the valve body 44 and the valve seat 43 are not separated from each other. Therefore, the closed state of the pressure control valve 41 is maintained.

  As described above, the pressure control valve 41 opens when the pressure of the fluid on the flow path 42c side exceeds a predetermined value as shown in FIG. 3B, and as shown in FIG. Since the fluid does not flow from the flow path 42d to the flow path 42c and the closed state can be maintained, it also functions as a check valve. In FIG. 3C, in order to make the drawing easier to see, the stepped portions and contour lines of each component of the pressure control valve 41 are omitted, and only the cross section is shown.

  Next, a fourth embodiment of the pressure control valve according to the present invention will be described with reference to FIG.

  The pressure control valve 61 is roughly divided into a valve body 62 (62A, 62B) in which two parts having valve chambers 62a, 62b are joined, and a valve seat 63 in the valve chambers 62a, 62b. It is comprised by the valve body 64 grade | etc.,.

  The valve main body 62 (62A, 62B) is formed of metal, synthetic resin, or the like, and includes valve chambers 62a, 62b as cylindrical spaces inside. Further, the valve main body 62A has a flow path 62c, and the valve main body 62B has a flow path 62c. A flow path 62d is formed.

  The valve body 64 is formed in a sealed cylindrical container shape with a thin plate of metal or the like, and the inside of the container is vacuum. The outer peripheral surface of the valve body 64 is in contact with the protrusion 63 a of the valve seat 63. The left end portion of the valve body 64 is fixed to the inner peripheral surface of the valve main body 62 </ b> B via the holding member 65.

  The valve seat 63 is formed in a cylindrical shape with a thin plate of metal or the like, and is fixed to the inner peripheral surface of the valve chamber 62a. A sealed space is formed between the valve seat 63 and the inner peripheral surface of the valve chamber 62a, and the inside is a vacuum. The valve seat 63 includes a protrusion 63 a on the inner peripheral surface, and the protrusion 63 a contacts and separates from the outer peripheral surface of the valve body 64 to open and close the pressure control valve 61.

  The holding member 65 includes a holding portion 65a that holds the left end portion of the valve body 64, and a plurality of leg portions 65b that are continuous with the holding portion 65a and are fixed to the inner peripheral surface of the valve body 62B. The channel 62d and the valve chamber 62b communicate with each other through the gap.

  Next, the operation of the pressure control valve 61 having the above configuration will be described with reference to FIG.

  FIG. 4A shows a state in which the pressure control valve 61 is closed. In this state, the outer peripheral surface of the valve body 64 is in contact with the protrusion 63a of the valve seat 63. The fluid does not flow in any direction of 62d and the flow path 62d to the flow path 62c.

  When the pressure of the fluid on the flow path 62c side rises from the state of FIG. 4A and exceeds a predetermined value, the valve body 64 is reduced in diameter due to elastic deformation as shown in FIG. The seat 63 is also elastically deformed to expand, and a gap is formed between the protrusion 63a of the valve seat 63. The fluid flows through the gap to the left, through the valve chambers 62a and 62b, toward the flow path 62d, and the pressure control valve 61 is opened. Note that, in FIG. 4B, in order to make the drawing easier to see, the stepped portions and contour lines of each component of the pressure control valve 61 are omitted, and only a cross section is shown.

  Further, when the pressure of the fluid on the flow path 62d side increases from the state of FIG. 4A, the valve body 64 is reduced in diameter by elastic deformation and the valve seat 63 is also elastically deformed as described above. Since a gap is formed between the valve seat 63 and the valve seat 63, the fluid flows to the right through the gap to the flow path 62c side through the valve chambers 62b and 62a, and the pressure control valve 61 is opened. It becomes.

  As described above, the pressure control valve 61 opens when the pressure of the fluid on either the flow path 62c side or 62d side exceeds a predetermined value, and can flow the fluid in both directions.

  Next, a fifth embodiment of the pressure control valve according to the present invention will be described with reference to FIG.

  The pressure control valve 81 is roughly divided into a valve body 83 having a valve chamber 82a therein, and a valve body 83 that contacts and separates from an inner peripheral surface 82b (hereinafter referred to as “valve seat”) of the valve body 82 that functions as a valve seat. Etc.

  The valve body 82 is formed of metal, synthetic resin, or the like, and includes a valve chamber 82a as a cylindrical space inside, and the valve body 83 is accommodated in the valve chamber 82a. A housing 85 having a flow path 85a is integrated on the left side of the valve body 83, and a housing 86 having a flow path 86a is integrated on the right side.

  The valve body 83 is a solid elastic body made of a synthetic resin such as rubber, and is formed in a columnar shape whose outer diameter gradually decreases from the left to the right, and the right end 83a is a valve body. It is fixed to a support member 87 fixed to the inner peripheral surface of 82. Although the support member 87 is formed in a disc shape, a plurality of through holes (not shown) are formed in the support member 87, so that the left and right sides of the valve chamber 82a partitioned by the support member 87 are in communication. On the other hand, the left end portion 83b has a larger diameter than the other portions and includes a recess 83c. The outer peripheral surface of the left end portion 83b is in contact with the valve seat 82b.

  The housing 85 is formed of metal, synthetic resin, or the like, and a cylindrical space is formed inside as a flow path 85a. The housing 86 is also formed of synthetic resin or the like, and a cylindrical space is formed as a flow path 86a inside.

  Next, the operation of the pressure control valve 81 having the above configuration will be described with reference to FIG.

  FIG. 5A shows a state in which the pressure control valve 81 is closed. In this state, the left end portion 83b of the valve body 83 is in contact with the inner peripheral surface of the valve seat 82b. The fluid does not flow in any direction from 86a and the flow path 86a to the flow path 85a.

  When the pressure of the fluid on the flow path 86a rises from the state of FIG. 5A and exceeds a predetermined value, the left end 83b is elasticized by the fluid pressure in the valve chamber 82a as shown in FIG. 5B. The diameter is reduced by the deformation, and a gap is formed between the valve seat 82b. The fluid flows through the gap to the left toward the flow path 85a, and the pressure control valve 81 is opened. In FIG. 5 (b), in order to make the drawing easier to see, stepped portions and contour lines of each component of the pressure control valve 81 are omitted, and only a cross section is shown.

  On the other hand, when the pressure of the fluid on the flow path 85a side increases from the state of FIG. 5A, the fluid pressure in the recess 83c of the valve body 83 also increases through the flow path 85a. The portion 83b is pressed toward the valve seat 82b, and the left end portion 83b and the valve seat 82b are not separated from each other. Therefore, the closed state of the pressure control valve 81 is maintained.

  As described above, the pressure control valve 81 opens when the fluid pressure on the flow path 86a side exceeds a predetermined value, as shown in FIG. 5B, and as shown in FIG. Since the fluid does not flow from the flow path 85a to the flow path 86a and the closed state can be maintained, it also functions as a check valve. In FIG. 5 (c), in order to make the drawing easier to see, the stepped portions and contour lines of each component of the pressure control valve 81 are omitted, and only the cross section is shown.

It is sectional drawing which shows 1st Embodiment of the pressure control valve concerning this invention. It is sectional drawing which shows 2nd Embodiment of the pressure control valve concerning this invention. It is sectional drawing which shows 3rd Embodiment of the pressure control valve concerning this invention. It is sectional drawing which shows 4th Embodiment of the pressure control valve concerning this invention. It is sectional drawing which shows 5th Embodiment of the pressure control valve concerning this invention.

Explanation of symbols

1 Pressure control valve 2 (2A, 2B) Valve body 2a Valve chamber 2b Valve chamber 2c Channel 2d Channel 3 Valve seat 4 Valve body 5 Holding member 5a Holding portion 5b Leg 21 Pressure control valve 22 Valve body 22a Valve chamber 22b Through hole 22c Projecting portion 23 Valve seat 24 Valve body 24a Large diameter portion 24b Notch portion 25 Housing 25a Channel 26 Housing 26a Channel 27 O-ring 29 Clearance 41 Pressure control valve 42 (42A, 42B) Valve body 42a Valve chamber 42b Valve chamber 42c Channel 42d Channel 43 Valve seat 44 Valve body 45 Holding member 45a Holding portion 45b Leg 61 Pressure control valve 62 (62A, 62B) Valve body 62a Valve chamber 62b Valve chamber 62c Channel 62d Channel 63 Valve seat 63a Projection part 64 Valve body 65 Holding member 65a Holding part 65b Leg part 81 Pressure control valve 82 Valve body 82a Valve chamber 82b Inner peripheral surface (valve seat)
83 Valve body 83a Right end part 83b Left end part 83c Recessed part 83d Stopper 85 Housing 85a Flow path 86 Housing 86a Flow path 87 Support member 87a Insertion hole

Claims (6)

A valve body having a valve chamber therein; a valve seat provided in the valve chamber; and a valve body contacting and separating from the valve seat, wherein either one or both of the valve body and the valve seat are made of an elastic body. And in a state where the valve body and the valve seat are in contact with each other, two spaces are defined in the valve chamber, and communication between these spaces is shut off and closed.
When the pressure of the fluid in one of the two spaces exceeds a predetermined value, either one or both of the valve body and the valve seat are elastically deformed, and the valve body and the valve seat are separated from each other. A pressure control valve characterized in that the two spaces communicate with each other and are in an open state.   The valve body is a sealed cylindrical container made of a thin plate with a vacuum inside, and the valve seat is fixed in the valve chamber and has an opening that surrounds a circumferential surface of the sealed cylindrical container. When the circumferential surface of the cylindrical container and the inner peripheral surface of the opening of the valve seat come into contact with each other, the valve body is closed when the pressure of the fluid in one of the two spaces exceeds a predetermined value. The pressure control valve according to claim 1, wherein the valve body and the valve seat are separated from each other and are opened.   The valve body includes a columnar portion, the valve seat is formed of a thin plate, and includes a cylindrical portion surrounding a circumferential surface of the columnar portion, and the circumferential surface of the columnar portion of the valve body and the thin plate When the fluid pressure in one of the two spaces exceeds a predetermined value, the valve seat is elastically deformed, and the valve body and the valve seat are The pressure control valve according to claim 1, wherein the pressure control valve is opened while being separated from each other.   The valve body is formed of a thin plate, is formed in a cylindrical shape with one end closed and the other end open, the valve seat is fixed in the valve chamber, and the circumferential surface of the valve body is An opening that surrounds the valve body, and a circumferential surface of the valve body and an inner peripheral surface of the opening portion of the valve seat come into contact with each other, and the closed one of the two spaces is closed. When the pressure of the fluid in the space facing the end exceeds a predetermined value, the valve body is elastically deformed, and the valve body and the valve seat are separated from each other to be opened. Item 2. The pressure control valve according to Item 1.   The valve body is a sealed cylindrical container made of a thin plate with a vacuum inside, and the valve seat is fixed in the valve chamber and has an opening that surrounds a circumferential surface of the sealed cylindrical container. When the circumferential surface of the cylindrical container and the inner peripheral surface of the opening of the valve seat come into contact with each other, the valve body is closed when the pressure of the fluid in one of the two spaces exceeds a predetermined value. The pressure control valve according to claim 1, wherein the valve seat and the valve seat are elastically deformed, and the valve body and the valve seat are separated from each other to be in an open state.   The valve body is a solid cylindrical body made of an elastic body, and the valve seat is an inner peripheral surface of the valve chamber surrounding the solid cylindrical body, and an outer peripheral surface of the solid cylindrical body When the inner peripheral surface of the valve chamber comes into contact with each other to be in a closed state, and the pressure of the fluid in one of the two spaces exceeds a predetermined value, the valve body is elastically deformed, and the valve body The pressure control valve according to claim 1, wherein the valve seat and the valve seat are opened apart from each other.

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