JP2025136509A - Valve unit and valve device - Google Patents

Abstract

To provide a valve unit and a valve device capable of suppressing deformation of a valve seat member formed by pressing.SOLUTION: A valve device 1 has a valve seat member 10 arranged in a mounting hole 5 of a flow path unit. The valve seat member 10 is formed by pressing, and has a peripheral wall part 11 and a bottom wall part 12. The bottom wall part 12 has a valve port 15. A valve seat 16 surrounding the valve port 15 is provided on an upper surface 12a of the bottom wall part 12. A support surface 17 perpendicular to an axial line L is provided on a lower surface 12b of the bottom wall part 12. The support surface 17 contacts a bottom surface 5b of the mounting hole 5.SELECTED DRAWING: Figure 3

Description

The present invention relates to a valve unit and a valve device having a valve unit.

Patent Document 1 describes an example of a conventional valve device. The valve device has a lower body, which is a flow path unit, and an upper body, which is part of a valve unit. The upper body is attached to the lower body. A valve seat member is fixed to the upper body. The valve seat member has a cylindrical peripheral wall portion and a bottom wall portion connected to the lower end of the peripheral wall portion. A valve body is disposed inside the valve seat member. A valve port and a valve seat are provided on the bottom wall portion.

Japanese Patent Application Laid-Open No. 2003-227576

The valve seat member in Patent Document 1 is formed by cutting a metal workpiece. Forming the valve seat member by pressing sheet metal reduces the manufacturing costs of the valve unit. However, when the valve port is closed, the valve disc comes into contact with the valve seat and is subjected to a downward force pressing it against the bottom wall. Valve seat members formed from sheet metal have relatively low rigidity, and there is a risk of the valve seat member deforming.

The present invention therefore aims to provide a valve unit and valve device that can suppress deformation of the valve seat member formed by press working.

To achieve the above object, one aspect of the present invention provides a valve unit that is attached to a flow path unit having a mounting hole and a flow path connected to the mounting hole. The valve unit includes a valve seat member having a peripheral wall portion and a bottom wall portion connected to one end of the peripheral wall portion, and a valve element that is disposed inside the valve seat member and moves in the axial direction of the peripheral wall portion. The valve seat member is formed by press working and disposed in the mounting hole. The bottom wall portion has a valve port. A support surface is provided on the outer surface of the bottom wall portion that is perpendicular to or inclined with respect to the axial direction, and the support surface contacts the bottom surface of the mounting hole, or a member is held between the support surface and the bottom surface of the mounting hole.

In the present invention, it is preferable that the support surface is an annular surface surrounding the valve orifice.

In the present invention, it is preferable that an annular sealing member be held between the support surface and the bottom surface of the mounting hole.

In the present invention, it is preferable that the support surface includes multiple surfaces arranged around the valve orifice.

In the present invention, it is preferable that a valve seat surrounding the valve orifice is provided on the inner surface of the bottom wall portion.

In the present invention, it is preferable that the valve unit further includes a tubular member disposed inside the valve seat member, one end of the tubular member being provided with a valve seat that faces the valve body in the axial direction, and the internal space of the tubular member being connected to the valve port.

To achieve the above object, a valve device according to another aspect of the present invention comprises the valve unit and the flow path unit.

In the present invention, it is preferable that the inner peripheral surface of the mounting hole is provided with a female thread, and the outer peripheral surface of the peripheral wall portion is provided with a male thread that screws into the female thread.

In the present invention, it is preferable that an annular groove extending in the circumferential direction is provided on the inner peripheral surface of the mounting hole, and that an annular sealing member that seals the gap between the flow path unit and the peripheral wall portion is disposed in the annular groove.

According to the present invention, a valve seat member having a peripheral wall portion and a bottom wall portion is formed by press working, and the valve seat member is placed in a mounting hole of a flow path unit. A support surface provided on the outer surface of the bottom wall portion is perpendicular or inclined relative to the axial direction of the peripheral wall portion. The support surface contacts the bottom surface of the mounting hole, or the member is held between the support surface and the bottom surface of the mounting hole. As a result, the bottom wall portion having the support surface is directly or indirectly supported by the bottom surface of the mounting hole. This effectively suppresses deformation of the valve seat member formed by press working.

1 is a cross-sectional view of a valve device according to a first embodiment of the present invention. 3 is a cross-sectional view of a passage unit and a valve body assembly of a valve unit included in the valve device. FIG. 2 is a cross-sectional view showing a bottom wall portion of a valve seat member and its vicinity included in the valve device of FIG. 1 . FIG. 2 is a cross-sectional view showing the configuration of a first modified example of the valve device of FIG. 1 . FIG. 4 is a cross-sectional view showing the configuration of a second modified example of the valve device of FIG. 1 . FIG. 10 is a cross-sectional view showing the configuration of a third modified example of the valve device of FIG. FIG. 4 is a cross-sectional view of a valve device according to a second embodiment of the present invention. 8 is a cross-sectional view showing a bottom wall portion of a valve seat member and its vicinity provided in the valve device of FIG. 7. FIG.

The valve device according to the first embodiment of the present invention will now be described with reference to Figures 1 to 3.

Figure 1 shows a valve device according to a first embodiment of the present invention. The valve device 1 according to this embodiment is incorporated, for example, into the refrigeration cycle system of an air conditioner installed in a vehicle, and is used as a flow control valve that controls the flow rate of refrigerant.

The valve device 1 has a flow path unit 3 and a valve unit 8.

The flow path unit 3 has a main body block 4. The main body block 4 is made of, for example, an aluminum alloy and has a rectangular parallelepiped shape.

The main body block 4 has a mounting hole 5 and flow paths 6 and 7.

The main body block 4 has a circular annular protrusion 4e. The annular protrusion 4e is located on the upper surface 4a of the main body block 4, and a mounting hole 5 is provided inside the annular protrusion 4e. A circumferentially extending annular groove 5g is provided in the lower part of the inner surface 5a of the mounting hole 5. A ring-shaped sealing member S1 is disposed in the annular groove 5g. Furthermore, a female thread 5t is provided in the upper part of the inner surface 5a.

The flow paths 6 and 7 are connected to the mounting hole 5. One end of the flow path 6 opens to the inner surface 5a of the mounting hole 5. One end of the flow path 7 opens to the bottom surface 5b of the mounting hole 5.

The valve unit 8 includes a valve body assembly 9 and a stator unit 60. Figure 2 shows the flow path unit 3 and the valve body assembly 9.

The valve body assembly 9 includes a valve seat member 10, a can 20, a valve body 30, and a drive mechanism 40.

The valve seat member 10 integrally comprises a peripheral wall portion 11, a bottom wall portion 12, and a connecting portion 13.

The peripheral wall 11 has a cylindrical shape. The peripheral wall 11 is formed with the same thickness from the top to the bottom. The peripheral wall 11 has multiple horizontal holes 11d. A receiving surface 11r is provided on the inner surface of the peripheral wall 11. The receiving surface 11r is a circular, annular flat surface facing upward. A male thread 11t is provided on the upper part of the outer surface of the peripheral wall 11. The male thread 11t is threaded into the female thread 5t of the mounting hole 5 in the main body block 4.

The bottom wall portion 12 has a disk shape. The outer peripheral edge of the bottom wall portion 12 is connected to the lower end of the peripheral wall portion 11. The bottom wall portion 12 closes the lower end of the peripheral wall portion 11. The peripheral wall portion 11 and the bottom wall portion 12 define a valve chamber 14. The bottom wall portion 12 has a valve orifice 15. A circular annular valve seat 16 is provided on the upper surface 12a of the bottom wall portion 12. The valve seat 16 surrounds the valve orifice 15. A support surface 17 is provided on the lower surface 12b of the bottom wall portion 12. The support surface 17 is a circular annular plane facing downward and surrounds the valve orifice 15. The support surface 17 is perpendicular to the axis L direction (up-down direction). The upper surface 12a is the inner surface of the bottom wall portion 12, and the lower surface 12b is the outer surface of the bottom wall portion 12.

The connection portion 13 has a circular disk shape. The inner peripheral edge of the connection portion 13 is connected to the upper end of the peripheral wall portion 11.

In the manufacturing process for the valve seat member 10, the peripheral wall portion 11, bottom wall portion 12, and connecting portion 13 are integrally formed by pressing sheet metal, and the receiving surface 11r, valve port 15, valve seat 16, and support surface 17 are also formed. The horizontal hole 11d and male thread 11t are then formed in the peripheral wall portion 11 to complete the valve seat member 10.

The can 20 is made of a metal such as stainless steel. The can 20 has a cylindrical shape. The bottom end of the can 20 is open and the top end is closed. The bottom end of the can 20 is joined to the outer periphery of the connection portion 13.

The valve element 30 has a shaft portion 31 and a valve portion 33. The shaft portion 31 has a cylindrical shape. A spring bearing surface 34 is provided on the outer peripheral surface of the shaft portion 31. The spring bearing surface 34 is a circular, annular plane facing upward. The valve portion 33 has a conical shape. The valve portion 33 is connected to the lower end of the shaft portion 31. The lower part of the shaft portion 31 is disposed in a valve chamber 14 provided inside the valve seat member 10. The valve portion 33 faces the valve seat 16 in the direction of the axis L. The valve portion 33 passes through the valve seat 16 and is disposed in the valve port 15. A variable throttle portion is formed between the valve portion 33 and the valve seat 16. When the valve portion 33 contacts the valve seat 16, the valve port 15 closes. When the valve portion 33 moves away from the valve seat 16, the valve port 15 opens. Figures 1 to 3 show the valve element 30 from a front view.

The drive mechanism 40 moves the valve disc 30 up and down. The movement of the valve disc 30 changes the opening of the valve port 15. The drive mechanism 40 has a rotor 41, a valve stem holder 42, a guide bush 43, a connecting member 45, a retaining member 46, and a valve-closing spring 47.

The rotor 41 has a cylindrical shape. The rotor 41 is arranged inside the can 20. The rotor 41 has multiple magnetic poles. The multiple magnetic poles are arranged on the outer circumferential surface of the rotor 41. The rotor 41 is a magnet rotor.

The valve stem holder 42 has a cylindrical shape. The lower end of the valve stem holder 42 is open. The valve stem holder 42 has an upper wall portion 42a. The valve stem holder 42 is fixed to the rotor 41 via a connecting member 45. The valve stem holder 42 rotates together with the rotor 41. The upper part of the shaft portion 31 of the valve element 30 is inserted into a hole provided in the upper wall portion 42a. A retaining member 46 is fixed to the upper part of the shaft portion 31. A valve-closing spring 47 is disposed between the upper wall portion 42a and the spring receiving surface 34 of the valve element 30. The valve-closing spring 47 is a coil spring that presses the valve element 30 toward the valve seat 16. A female thread 42t is provided on the inner surface of the valve stem holder 42.

The guide bush 43 has a base 43a and a support portion 43b. The base 43a and support portion 43b are cylindrical. The base 43a is press-fit into the peripheral wall portion 11 of the valve seat member 10, and the lower end surface of the base 43a abuts against the receiving surface 11r of the peripheral wall portion 11. The support portion 43b is connected to the upper end of the base 43a. A male thread 43t is provided on the outer peripheral surface of the support portion 43b. The male thread 43t is threadedly engaged with the female thread 42t of the valve stem holder 42. The stem portion 31 of the valve disc 30 is positioned inside the guide bush 43. The guide bush 43 supports the valve disc 30 so that it can move up and down.

The stator unit 60 is attached to the valve body assembly 9. The stator unit 60 has a stator 61 and a housing 62. The stator 61 has a cylindrical shape. The can 20 is arranged inside the stator 61. The stator 61 has multiple coils and multiple pole teeth. The multiple pole teeth face the outer surface of the rotor 41 across the can 20. Supplying drive current to the multiple coils magnetizes the multiple pole teeth, causing the rotor 41 to rotate. The rotor 41 and stator 61 form a stepping motor 66. When the rotor 41 rotates, the rotor 41 and valve stem holder 42 move up and down due to the feed screw action between the female thread 42t of the valve stem holder 42 and the male thread 43t of the guide bush 43. As the valve stem holder 42 moves, the valve element 30 moves up and down.

In the valve unit 8, the central axes of the valve seat member 10 (peripheral wall portion 11, bottom wall portion 12, valve port 15, valve seat 16, support surface 17), can 20, valve body 30 (shaft portion 31, valve portion 33), rotor 41, valve stem holder 42, guide bush 43 (base portion 43a, support portion 43b), and stator 61 all coincide with axis L. Axis L is in the axial direction of the peripheral wall portion 11.

Next, the assembly method for the valve device 1 will be explained with reference to Figures 2 and 3.

A sealing member S1 is placed in the annular groove 5g of the main body block 4 of the flow path unit 3. A ring-shaped sealing member S2 is placed on the upper end surface of the annular protrusion 4e of the main body block 4, and a ring-shaped sealing member S3 is placed around the annular protrusion 4e. The sealing members S1 to S3 are made of rubber or synthetic resin.

The valve seat member 10 of the valve unit 8 is inserted into the mounting hole 5 of the main body block 4, and the male thread 11t of the valve seat member 10 is threaded into the female thread 5t of the main body block 4. When the valve seat member 10 passes through the sealing member S1 and the support surface 17 of the valve seat member 10 abuts against the bottom surface 5b of the mounting hole 5, the valve unit 8 is fixed to the main body block 4 and the valve seat member 10 is positioned in the mounting hole 5.

When the valve seat member 10 is placed in the mounting hole 5, the valve chamber 14 is connected to the flow path 6 via the horizontal hole 11d of the valve seat member 10 and the mounting hole 5, and the valve port 15 is connected to the flow path 7. The sealing member S1 is compressed radially, sealing the gap between the main body block 4 and the peripheral wall portion 11 of the valve seat member 10. The sealing member S2 is compressed in the axial direction L, sealing the gap between the main body block 4 and the connection portion 13 of the valve seat member 10.

Then, the can 20 is inserted inside the stator 61, and the stator unit 60 is attached to the valve body assembly 9. The housing 62 surrounds the sealing member S3, which is compressed radially, sealing the gap between the body block 4 and the housing 62. In this way, the valve device 1 is completed.

As described above, the valve device 1 includes a flow path unit 3 and a valve unit 8. The flow path unit 3 includes a mounting hole 5 and flow paths 6 and 7 connected to the mounting hole 5. The valve unit 8 includes a valve seat member 10 having a peripheral wall portion 11 and a bottom wall portion 12 connected to the lower end of the peripheral wall portion 11, and a valve element 30 disposed inside the valve seat member 10 and movable in the direction of the axis L. The valve seat member 10 is formed by press working and disposed in the mounting hole 5. The bottom wall portion 12 has a valve port 15. The lower surface 12b of the bottom wall portion 12 is provided with a support surface 17 perpendicular to the direction of the axis L. The support surface 17 contacts the bottom surface 5b of the mounting hole 5. As a result, the bottom wall portion 12 having the support surface 17 is supported by the bottom surface 5b of the mounting hole 5. This effectively suppresses deformation of the valve seat member 10 formed by press working.

Furthermore, the support surface 17 is an annular surface that surrounds the valve orifice 15. This allows the area around the valve orifice 15 on the bottom wall portion 12 to be evenly supported.

In addition, a valve seat 16 is provided on the upper surface 12a of the bottom wall portion 12. In this way, the valve seat 16 is formed together with the bottom wall portion 12 by press working, reducing manufacturing costs.

Furthermore, a female thread 5t is provided on the inner peripheral surface 5a of the mounting hole 5. A male thread 11t is provided on the outer peripheral surface of the peripheral wall portion 11, and is threaded into the female thread 5t. This allows the valve unit 8 to be attached to the flow path unit 3 using a relatively simple thread structure. However, the valve unit 8 may also be attached to the flow path unit 3 using other attachment structures.

The inner surface 5a of the mounting hole 5 is provided with an annular groove 5g extending in the circumferential direction. A sealing member S1 is disposed in the annular groove 5g to seal the gap between the main body block 4 of the flow path unit 3 and the peripheral wall portion 11. This eliminates the need to provide a groove in the peripheral wall portion 11 for disposing the sealing member S1. This prevents a decrease in the rigidity of the valve seat member 10.

Next, the configuration of modified examples of the valve device 1 according to this embodiment will be described with reference to Figures 4 to 6. In the following description, the same components as those in the valve device 1 will be assigned the same reference numerals and will not be described again. Note that in each of the modified valve devices, the inner circumferential surface 5a of the mounting hole 5 does not have an annular groove 5g.

Figure 4 shows a portion of a valve device 1A relating to a first variant of the valve device 1.

The valve device 1A has a valve seat member 10A. The valve seat member 10A has the same configuration as the valve seat member 10 of the valve device 1, except that it has a bottom wall portion 12A instead of the bottom wall portion 12.

A first support surface 17A and a second support surface 18A are provided on the lower surface 12b of the bottom wall portion 12A. The first support surface 17A is a circular, annular plane facing downward and surrounds the valve orifice 15. The second support surface 18A is a circular, annular plane facing downward and surrounds the first support surface 17A. The second support surface 18A is positioned above the first support surface 17A. The first support surface 17A and the second support surface 18A are perpendicular to the axis L.

The first support surface 17A contacts the bottom surface 5b of the mounting hole 5. An annular sealing member SA is held between the second support surface 18A and the bottom surface 5b. The sealing member SA is made of rubber or synthetic resin. Instead of the sealing member SA, an annular member made of metal or hard plastic may be held between the second support surface 18A and the bottom surface 5b.

Figure 5 shows a portion of a valve device 1B relating to a second variant of the valve device 1.

Valve device 1B has a valve seat member 10B. Valve seat member 10B has the same configuration as valve seat member 10 of valve device 1, except that it has a bottom wall portion 12B instead of bottom wall portion 12.

A first support surface 17B and a second support surface 18B are provided on the lower surface 12b of the bottom wall portion 12B. The first support surface 17B is a circular, annular flat surface facing downward and surrounds the valve orifice 15. The second support surface 18B is a circular, annular tapered surface facing downward. The inner peripheral edge of the second support surface 18B is connected to the outer peripheral edge of the first support surface 17B. The first support surface 17B is perpendicular to the axis L direction. The second support surface 18B is inclined with respect to the axis L direction.

The first support surface 17B contacts the bottom surface 5b of the mounting hole 5. An annular sealing member SB is held between the second support surface 18B and the bottom surface 5b. The sealing member SB is made of rubber or synthetic resin. The bottom wall portion 12B may have only one of the first support surface 17B and the second support surface 18B.

Figure 6 shows a portion of a valve device 1C relating to a third variant of the valve device 1.

Valve device 1C has a valve seat member 10C. Valve seat member 10C has the same configuration as valve seat member 10 of valve device 1, except that it has a bottom wall portion 12C instead of bottom wall portion 12.

A support surface 17C is provided on the underside 12b of the bottom wall portion 12C. The support surface 17C is a circular, annular plane facing downward and surrounds the valve orifice 15. The support surface 17C is perpendicular to the axis L.

An annular sealing member SC is held between the support surface 17C and the bottom surface 5b. The sealing member SC is made of rubber or synthetic resin. Instead of the sealing member SC, an annular member made of metal or hard plastic may be held between the support surface 17C and the bottom surface 5b.

Valve devices 1A to 1C also achieve the same effects as valve device 1.

A valve device according to a second embodiment of the present invention will now be described with reference to Figures 7 and 8. In the following description, components that are the same as those in valve device 1 will be assigned the same reference numerals and will not be described again.

The valve device 2 according to the second embodiment of the present invention has the same configuration as the valve device 1, except that it further includes a cylindrical member 70.

The valve unit 8 of the valve device 2 has a tubular member 70. The tubular member 70 has a cylindrical shape. The tubular member 70 is press-fit into the valve seat member 10 and is positioned coaxially inside the valve seat member 10. A ring-shaped valve seat 76 is provided at the upper end (one end) of the tubular member 70. The lower end (other end) of the tubular member 70 contacts the upper surface 12a of the bottom wall portion 12 of the valve seat member 10, and the internal space 75 of the tubular member 70 is connected to the valve port 15. The valve port 15 and the internal space 75 form a single valve port. The valve portion 33 of the valve body 30 faces the valve seat 76 in the direction of the axis L. The valve portion 33 passes through the valve seat 76 and is positioned in the internal space 75. A variable throttle portion is formed between the valve portion 33 and the valve seat 76. When the valve portion 33 contacts the valve seat 76, the internal space 75 is separated from the valve chamber 14 and the valve port is closed. When the valve portion 33 separates from the valve seat 76, the inner space 75 connects with the valve chamber 14, and the valve port opens. Figures 7 and 8 show the valve body 30 as viewed from the front.

Valve device 2 achieves the same effects as valve device 1. Furthermore, because the tubular member 70 having the valve seat 76 is a separate part from the valve seat member 10, the tubular member 70 can be manufactured using a processing method with higher precision than press working, thereby more effectively suppressing valve leakage.

In the valve devices 1 and 2, the bottom wall portion 12 of the valve seat member 10 is provided with a support surface 17, which is an annular surface. Instead of the support surface 17, the bottom wall portion 12 may be provided with a support surface including multiple surfaces arranged around the valve orifice 15. For example, the multiple surfaces are arranged at equal intervals in the circumferential direction of the valve orifice 15.

Valve devices 1 and 2 have a drive mechanism 40 that uses the rotation of the rotor 41 without slowing it down. Instead of the drive mechanism 40, valve devices 1 and 2 may have a drive mechanism that includes a speed reduction mechanism that slows down the rotation of the rotor 41.

In this specification, terms indicating shape, such as "cylinder" and "column," are also used to refer to members or portions of members that essentially have the shape of that term. For example, a "cylindrical member" includes both cylindrical members and substantially cylindrical members. Also, in this specification, the term "same" can include both exactly the same and substantially the same.

Although the above describes an embodiment of the present invention, the present invention is not limited to the embodiment. Those skilled in the art may appropriately add, delete, or modify components of the above-described embodiment, or appropriately combine features of the embodiments, and these combinations are also within the scope of the present invention, as long as they do not deviate from the spirit of the present invention.

1, 1A, 1B, 1C... valve device 3... flow path unit, 4... main body block, 4a... upper surface, 4e... annular protrusion,
5...mounting hole, 5a...inner peripheral surface, 5b...bottom surface, 5g...annular groove, 5t...female thread, 6, 7...flow path,
8... valve unit, 9... valve body assembly,
10, 10A, 10B, 10C... valve seat member,
11...peripheral wall portion, 11d...horizontal hole, 11r...receiving surface, 11t...male thread,
12, 12A, 12B, 12C...bottom wall portion, 12a...upper surface, 12b...lower surface,
13... Connection portion, 14... Valve chamber, 15... Valve port, 16... Valve seat,
17, 17C... Support surface, 17A, 17B... First support surface, 18A, 18B... Second support surface, 20... Can, 30... Valve body, 31... Shaft portion, 33... Valve portion, 34... Spring bearing surface,
40: Drive mechanism; 41: Rotor;
42... valve stem holder, 42a... upper wall portion, 42t... female thread,
43... guide bush, 43a... base portion, 43b... support portion, 43t... male screw,
45...connecting member, 46...preventing member, 47...valve closing spring,
60... stator unit, 61... stator, 62... housing,
66...Stepping motor,
70... Cylinder member, 75... Inner space, 76... Valve seat S1, S2, S3, SA, SB, SC... Sealing member, L... Axis line

Claims (9)

A valve unit attached to a flow path unit having an attachment hole and a flow path connected to the attachment hole,
the valve unit includes a valve seat member having a peripheral wall portion and a bottom wall portion connected to one end of the peripheral wall portion, and a valve body disposed inside the valve seat member and movable in an axial direction of the peripheral wall portion,
the valve seat member is formed by pressing and placed in the mounting hole;
the bottom wall portion has a valve port;
a support surface that is perpendicular to or inclined with respect to the axial direction is provided on an outer surface of the bottom wall portion;
A valve unit characterized in that the support surface contacts the bottom surface of the mounting hole, or a member is held between the support surface and the bottom surface of the mounting hole. The valve unit of claim 1, wherein the support surface is an annular surface surrounding the valve orifice. The valve unit described in claim 2, wherein an annular sealing member is held between the support surface and the bottom surface of the mounting hole. The valve unit of claim 1, wherein the support surface includes multiple surfaces arranged around the valve orifice. The valve unit of claim 1, wherein the inner surface of the bottom wall portion is provided with a valve seat surrounding the valve orifice. the valve unit further includes a cylindrical member disposed inside the valve seat member,
a valve seat facing the valve body in the axial direction is provided at one end of the cylindrical member;
The valve unit according to claim 1 , wherein the inner space of the cylindrical member is connected to the valve port. A valve device comprising the valve unit described in any one of claims 1 to 6 and the flow path unit. The mounting hole has an inner peripheral surface provided with a female thread,
The valve device according to claim 7 , wherein an external thread is provided on an outer peripheral surface of the peripheral wall portion to be threadedly engaged with the internal thread. An annular groove extending in a circumferential direction is provided on an inner peripheral surface of the mounting hole,
The valve device according to claim 7 , wherein an annular sealing member is disposed in the annular groove to seal a gap between the flow path unit and the peripheral wall portion.