JP2819219B2 - Valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cage type valve device used for controlling a fluid in, for example, the petroleum industry or the chemical industry, and more particularly to a cage having a window for controlling a fluid and moving up and down in the cage to open and close the window. The present invention relates to a seal structure for obtaining a shutoff performance with a valve plug to be controlled.

[0002]

2. Description of the Related Art In a valve device, a cage type control valve has a hole or a characteristic window for fluid control on a peripheral wall of a cylindrical cage disposed in a valve body and facing a fluid flow path. The opening area of the fluid control hole or window is changed by a cylindrical plug that moves up and down in the cage to control the flow rate of the fluid.

In such a cage type control valve, there is a gap between the cage and the plug for securing the movement of the plug, and it is necessary to securely close the fluid through such a gap. Is desired. Soft seats are generally used for seats where such complete closure is required.
Have been.

For example, a cage type control valve used for a large-capacity high-pressure gas governor is required to have a particularly high shut-off performance. Therefore, a soft sheet made of a resin such as Teflon is used as a sheet material of the valve. Such a soft seat is attached to the lower part of the cage of the valve body, etc., and cuts off the flow path by contacting the cylindrical plug.

FIG. 9 shows an example of the above-mentioned conventional cage-type control valve. The inside of a valve body 1 having a pipe connection flange 1a at both ends is divided into an upstream passage 3 (primary fluid passage) by a partition wall 2. ) And a downstream passage 4 (secondary fluid passage), and an upper lid 5 is fixed to the upper open end with a plurality of bolts and nuts 6. Between the upper lid 5 and the partition wall 2, a cylindrical cage 7 having a flange at an upper end is fitted and arranged via a gasket 8,
Further, gaskets 9 and 10 are interposed between the upper lid 5 and the partition wall 2 of the cage 7, respectively, and in this state, the bolts and nuts 6 are tightened and fixed to each other to be pressed and fixed to each other.

The cage 7 is disposed so as to penetrate the partition wall 2, and a plurality of fluid control windows 11 communicating with the inside of the cage 7 and the upstream passage 3 are opened in the peripheral wall . Reference numeral 12 denotes a substantially cylindrical plug slidably disposed in the cage 7, and is screwed to the lower end of a valve shaft 13 which slidably penetrates the upper lid 5 via a gland packing 13a.

The cage 7 has an upper cage 7a having a jaw and a central cage 7b having a fluid control window 11.
And a lower cage 7c that penetrates the partition wall 2, and is formed on an inner peripheral surface at a connection portion of these members.
Is provided with two annular steps. That is, each cage 7a, 7b, the inter-7c are formed in a substantially hook shape of the annular recess is upper and lower stages, upper made of an elastic material in the recess, by loading the lower soft sheets 14 and 15, The annular step is formed of an elastic material.

On the outer peripheral surface of the plug 12, two annular steps which are seated on the upper and lower soft seats 14, 15 are provided as upper and lower seating seats 12a, 12b. When the plug 12 is lowered, the seat portions 12a, 12b of the plug 12 come into contact with the upper and lower soft seats 14, 15 and are compressed and deformed by being sandwiched between the cage 7 and the fluid. Is to be shut off.

[0009]

However, the cage type control valve having the above-described conventional structure has a problem that the sealing performance at the time of shutoff is not always obtained. That is, since the cage 7 described above has a structure in which three parts are stacked in the axial direction, processing errors are accumulated by assembling, and as a result, the upper and lower soft sheets 14, 1
In 5, the sheet pitch may be shifted or the core may be shifted. This is the upper and lower soft seats 14, 15
This is because this displacement cannot be absorbed by the compressive deformation of.

[0010] In order to solve this problem, 3-3
Japanese Patent No. 1878 discloses an annular upper and lower soft seat forming a two-stage annular step formed on the inner peripheral surface of the cage 7 and the like in order to ensure the sealing performance at the time of shutoff in the cage type control valve. 14 and 15 each having an L-shaped cross section formed by a horizontal side extending in the radial direction and a cylindrical portion extending in the axial direction, and when the upper and lower soft seats are closed by a valve on the horizontal side. A gap is provided to allow the amount of elastic deflection in the upper and lower soft sheets 14 and 15, thereby increasing the amount of elastic deformation of the upper and lower soft sheets 14 and 15, absorbing a shift during processing and assembling, and providing a gap between the cage 7 and the plug 12. The cut-off performance has been improved.

However, according to such a conventional structure, the plug 12 is lowered in the cage 7 by the thrust from the operation device side and pressed against the upper and lower soft sheets 14 and 15, and the respective soft sheets 14 and 15 are pressed. The upper and lower soft seats 14 and 15 are tightly sealed to the seats 12a and 12b on the plug 12 side by utilizing the elasticity of the horizontal side of 15, and the upper and lower soft seats 14 and 15 are sealed. The deformation of No. 15 was only due to compression, and the deformation amount was small, and it was still insufficient to obtain a reliable sealing performance and improve the shutoff performance .

In particular, when the pressure of the fluid flowing through the valve increases, the closing force on the plug 12 is increased by the operating device,
Unless the amount of elastic deformation due to the bending of the upper and lower soft sheets 14 and 15 is increased, the sealing performance cannot be maintained. This is because there is a limit in the material strength of the resin material such as Teflon forming the upper and lower soft sheets 14 and 15.

Further, in the above-mentioned conventional structure, since the deformation amount of the upper and lower soft sheets 14 and 15 cannot be made so large, the elasticity of the upper and lower soft sheets 14 and 15 themselves can be utilized or the upper and lower soft sheets 14 and 15 can be used. There is also a problem that machining accuracy is required for the cage 7 and the plug 12 in order to adjust the pitch between the soft sheets 14 and 15 arranged in the vehicle, and it is desired to take some measures to solve these problems. It is rare.

The present invention has been made in view of such circumstances, and can easily and reliably secure the shut-off performance between an upper and lower soft seat and a seat between a cage and a plug. Even if the pressure increases, it is not necessary to increase the pressing force of the operating device on the plug side, the operating device can be downsized, and the required watertightness can be obtained without requiring the processing accuracy of each part. It is an object of the present invention to obtain a cage-type valve device capable of performing the following.

[0015]

In order to meet such a demand, a valve device according to the present invention comprises a cylindrical cage having a fluid control opening, and a plug which is slidably operated inside to control opening and closing of the opening. And, at one of the cage inner peripheral surface or the plug outer peripheral surface at a predetermined interval in the axial direction, provided at two lower positions, a pair of lower annular soft sheet,
On the other of the cage inner peripheral surface or the plug outer peripheral surface,
Upper and lower seats on which the lower soft seat sits
And

In the present invention, the soft sheet
At least the lower soft seal located at the bottom
Below the inner surface of the cage, on the seat at the lower end of the plug
Elastic deformation piece that can be selectively contacted and primary side on the back side
And a pressure chamber into which fluid pressure is introduced.
In both, the elastically deformed pieces in this lower soft sheet,
Have attached a locking means for locking in shape bear does not protrude more than a predetermined amount within the operating region of the plug when the valve opening operation of the plug
You.

Further, the valve device according to the present invention is characterized in that the soft
The upper soft core at least above the
The elastic seat that can selectively contact the seating portion.
Primary fluid pressure is introduced to the shape piece and the back side of this elastic deformation piece
Together configured to have a pressure chamber that is, the elastic deformation piece of <br/> upper soft seal, a second pressure secondary side fluid pressure on the opposite side of the pressure chamber of the primary side fluid pressure is introduced the differential pressure between these two pressure chambers by forming a chamber, is elastically deformable so constructed as sliding contact with the seat bottom portion of the mating member.

[0018]

According to the present invention, at least one of the upper and lower soft sheets (lower or upper) provided on the cage or plug is provided.
) Is configured as a self-sealing sheet structure having an elastically deformable piece that can be brought into contact with a seating portion on the other side and a pressure chamber that elastically deforms the elastically deformable piece by primary-side fluid pressure. By introducing the primary fluid pressure into the
The elastically deformable piece is pressed against the mating seat portion with a greater elastic force by utilizing the fluid pressure, so that the cage and the plug can be sealed with high shut-off performance .

[0019] Then, according to the present invention, the elastic deformation amount of the elastic deformation piece in the lower soft sheet, to be locked in position by the locking means during the valve opening operation of the plug
More, without allowing the protruding unnecessarily within the operating area of the plug, configured so as not to cause interference problems when the valve closing operation.

Further, according to the present invention, the elastically deformable piece of the upper soft seal includes a pressure chamber for introducing the primary fluid pressure and a second pressure chamber opposed to the pressure chamber for introducing the secondary fluid pressure. Is elastically deformed so as to always be in sliding contact with the mating seat portion side .

[0021]

1 and 2 show one embodiment of a valve device according to the present invention. In these drawings, the same or corresponding parts as those in FIG. Detailed description is omitted.

According to the present invention, in the valve device described above , a cylindrical cage 7 having a hole 11 which is a fluid control opening for selectively flowing a fluid in the valve body 1 and sliding in the cage 7. A plug 12 that is operated to control the opening and closing of the hole 11 and one of the inner peripheral surface of the cage 7 and the outer peripheral surface of the plug 12 (in the present embodiment, on the cage 7 side).
Upper and lower soft seats 20 and 21 provided at two lower positions
And upper and lower seating seats 12a, 12b provided on the other side of the cage 7 or the plug 12 (in this embodiment, on the plug 12 side) so that the upper and lower soft seats 20, 21 are seated.
It is equipped with a.

[0023] Oite to this configuration, at least one of the soft sheet 20, 21 (both in the present embodiment)
Is formed into an elastically deformable piece 22 which can be selectively brought into contact with the seat portions 12a, 12b.
A primary pressure chamber 23 for introducing a primary fluid pressure (fluid pressure on the upstream passage 3 side) through a gap between the cage 7 and a gap between the cage 7 and the plug 12 and the like is formed on the back side of 2.

According to such a configuration, the soft sheet 2
The elastically deformable pieces 22 at 0 and 21 are connected to the primary side (upstream side).
The introduction of the fluid pressure causes the mating seat portion 12
a, 12b can exert a self-sealing sheet function of securely pressing the plug 1a, 12b.
The closing performance between the cage 7 and the plug 12 can be improved and watertightness can be reliably ensured without increasing the operating force of the second operating device (not shown) .

In particular, in the above-described configuration, the elastically deformable pieces 22 are introduced into the upper and lower soft seats 20 and 21 by introducing the fluid pressure on the primary side to the seat 12 of the plug 12.
a, it is pressed against the 12b, because they employ a self-sealing sheet structure capable of improving the deadline performance, even when the fluid pressure of the controlled side of the valve device is high, use of this fluid pressure As a result, the watertightness can be reliably ensured, and the shutoff performance can be improved, and the necessity of increasing the size of the operating device of the plug 12 and increasing the operating force as in the related art can be eliminated.

Further, according to the above configuration, the cage 7
By adopting a structure in which the amount of deformation by the elastically deformable pieces 22 is large in the lower soft sheet 21 between the plug 12 and the lower soft sheet 21, a high sealing property can be reliably ensured by the fluid pressure on the primary side. The effect can be exhibited.

Further, in the soft seats 20 and 21 employing the above-described self-sealing sheet structure, the contact portions 22a of the elastically deformable pieces 22 with the mating seating seal portions 12a and 12b are formed as a substantially arc-shaped cross section. Thereby, the contact between the two can always be maintained in a line contact state, whereby high sealing performance at the contact portion 22a can be realized.

Here, in this embodiment, a part of the lower cage 7c is used as the metal seal portion 25, and the seat 12b at the lower end portion of the plug 12 is joined to the metal seal portion 25 when the valve is closed. In addition to improving the shut-off performance, the soft seal 21 is prevented from being excessively deformed.

Further, at least one of the upper and lower seal portions of the cage 7 and the plug 12 is provided with an elastically deformable piece 2 which can use a primary fluid pressure and obtain a relatively large amount of deformation.
Because 2 has a soft sheet 20, 21 according to an advantage that the machining accuracy of these components can be made rough.

Further , according to the present embodiment , in the lower soft sheet 21 employing the above-described self-sealing sheet structure, the elastically deformable piece 22 is moved relative to the mating side with the movement of the valve plug 12. When it shifts, cage 7
A stopper 24 and a locking portion 24a for restricting the plug 12 from being displaced to a position that interferes with the plug 12 during the valve closing operation on the inside.
Is provided.

With this configuration, the valve plug 12
When the plug 12 is lifted and no longer located within the deformation range of the elastic deformation piece 22, the plug 12 is locked so as not to be further elastically deformed at a predetermined position, and when the plug 12 is closed, In addition, it is possible to prevent the interference with the elastically deformable piece 22 and thereby to optimize the opening / closing control operation of the valve and to secure a required sealing property.
You.

Here, as is apparent from FIG. 2A, the elastically deformable pieces 22 in the lower soft sheet 21
The stopper 24 comes into contact with the locking portion 24a on the cage 7 side. In this state, the primary fluid pressure is not introduced into the pressure chamber 23, but the plug 12 descends and the seating portion 1
When the elastic member 2b abuts on the elastically deformable piece 22 and elastically deforms it, the stopper 24 separates from the locking portion 24a, whereby the primary pressure is guided to the pressure chamber 23 .

Further, in the above-described embodiment, in the soft seats 20 and 21 provided above and below the cage 7, the elastically deformable pieces 22 of the upper soft seat 20 are deformed upward by the differential pressure even when the valve is opened. It is configured to contact the outer peripheral surface on the plug 12 side to prevent gap flow.

That is, in the elastically deformable piece 22 of the upper soft sheet 20 disposed above the cage 7, the second pressure chamber into which the secondary fluid pressure is guided to the side opposite to the primary fluid pressure pressure chamber 23. By forming the pressure chamber 26, the pressure difference between the two pressure chambers 23, 26 allows the plug 12 to be elastically deformed to a required deformation state such that the plug 12 always comes into sliding contact with the seat 12a on the outer peripheral surface side . . Then, it is possible to prevent a gap flow in this portion and to enhance the sealing performance. The elastically deformable piece 22 of the upper soft seal 20 also has an advantage that it can serve as a scraper for removing scale attached to the outer peripheral surface of the plug 12.

Here, in the above-described embodiment, the self-sealing sheet structure characterizing the present invention is adopted for both the soft sheets 20 and 21 provided above and below the cage 7, but the present invention applies to this. It is easily understood that the present invention is not limited, and the required effects can be obtained even if the present invention is applied to only one of the soft sheets.

For example, FIG. 3 shows a case where only the upper soft sheet 20 has a self-sealing sheet structure, and FIG. 4 shows a case where only the lower soft sheet 21 has a self-sealing sheet structure. These upper or lower soft seats 20,
The operation and effect of 21 are as described above. The other soft sheet 20 or 21 has a simple L-shaped cross section.

In the above-described embodiment, the outside of the cage 7 on the left side of the partition wall 2 in the valve body 1 is defined as the primary side.
In the above description, all the upstream passages 3 are used, and the downstream passage 4 is used on the right side as the secondary side. However, the present invention is not limited to this.
Absent. For example, in FIGS. 5 to 7 , the right side of the partition wall 2 is the upstream passage 3 on the primary side, and the left side is the downstream passage 4 on the secondary side.
Is shown. Here, in FIG. 5, both the upper and lower soft sheets 20 and 21 have a self-sealing sheet structure. In this case, the difference from FIG.
The direction of the elastically deformable piece 22 is changed to the opposite direction by a fluid pressure introduction path to the pressure chamber 23 and the like on the primary side that applies a pressing force to the second member 2.

[0038] Furthermore, field 6 a case where only the upper soft sheet 20 and the self-sealing sheet structure, Figure 7 is that only the lower soft sheet 21 and the self-sealing sheet structure
Indicates a match. These upper or lower soft seats 20, 2
The operation and effect of 1 are as described above. The other soft sheet 20 or 21 has a simple cross section L
The letter-shaped thing is used.

FIG. 8 shows another embodiment in which the present invention is applied to a valve device using inner and outer double cages 30 and 31 as cages. The soft sheets 20 and 21 having the self-sealing sheet structure described above are used. Here, in this embodiment,
The cage 7 composed of the inner and outer cages 30 and 31 has a double-pipe structure with an upper connecting ring 32 and a lower connecting ring 33, and holes 34 and 35 for fluid flow are respectively provided in the inner cage 30. , The plug 12 moves up and down.

Here, the cage type valve device shown in FIG. 8 differs from that of the conventional structure in that the inner cage 30 is configured to be detachable from the outside. That is, in the figure, reference numeral 36 denotes a set ring which is provided by screwing to the inner peripheral portion of the upper connection ring 32.
The inner cage 30 is configured to be detachable from members welded and joined by the lower connecting rings 32 and 33 and the outer cage 31. In addition, 37, 37 are seals provided appropriately.

According to such a configuration, the inner and outer cages 30 and 31 are conventionally integrated by welding or the like, but by replacing the inner cage 30, the fluid passage opening and the outer cage are replaced. The valve characteristics may be changed depending on the relationship with the plug 31, the inner cage 30 may be formed by selecting a hard material that does not seize with the plug 12, or the inner cage 30 may be subjected to a thermosetting treatment or the like as necessary. It is also possible to do . Furthermore, there is an advantage that even when the inner cage 30 is damaged, it can be dealt with by replacing only the cage 30.

The present invention is not limited to the structure of the embodiment described above, and it goes without saying that the shape, structure and the like of each part of the valve device can be appropriately modified or changed . For example, in the above-described embodiment, the case where the soft sheets 20, 21 to which the present invention is applied is applied to the cage 7 (7a, 7b, 7c) having the divided structure has been described. However, the present invention is not limited to this. Of course, it may be provided on the 12th side. In this case, it is preferable to provide the respective seating portions on the cage 7 side. Such a structure is effective when the inside of the cage 7 is the primary side and the outside is the secondary side.

[0043]

As described above, according to the cage- type valve device of the present invention, the inner peripheral surface of the cage or the outer surface of the plug is not required.
Upper and lower parts provided at one of the upper and lower positions on one of the peripheral surfaces
Lower soft at least below the soft seat
Seat on the lower end of the plug below the inner circumferential surface of the cage.
An elastically deformable piece that can selectively contact the seat portion,
A pressure chamber into which the primary fluid pressure is introduced on the back side of the deformed piece
Together when configured to have, in the elastic deformation piece of the lower soft sheet <br/>, movement of the plug during the valve opening operation of the plug
Locking without projecting more than a predetermined amount into the working area
With the means, despite the simple structure,
The following excellent effects are obtained.

According to the present invention, the introduction of fluid pressure on the primary side of the valve
The elastically deformed piece is securely inserted into the seat
The self-sealing sheet function of pressing against
Operating force of the plug with the actuator
Deadline between cage and plug without increasing
Performance and improve watertightness.
You. In particular, the lower soft seat is pressed against the seating portion of the mating member by introducing the fluid pressure on the primary side,
Adopts a self-sealing sheet structure that can improve the shut-off performance, so even if the fluid pressure on the controlled side is high despite the simple structure, use this fluid pressure to ensure watertightness. In this case, the shut-off performance can be exhibited and the necessity of increasing the operating device and the like and increasing the operating force as in the related art can be eliminated.

Further, according to the present invention, by employing a structure in which the amount of deformation by the elastically deformable pieces is large in the lower soft sheet between the cage and the plug, a high sealing property is reliably ensured by the fluid pressure on the primary side. It can exhibit the effect as a self-sealing sheet.

Further, according to the present invention, at least one of the upper and lower seal portions of the cage and the plug is made of a soft elastic piece that can use a primary fluid pressure and obtain a relatively large amount of deformation. Since it is a sheet, there is an advantage that the processing accuracy of these components can be roughened.

Further, according to the present invention, the self-sealing
In the lower soft seat adopting the seat structure, a stopper that regulates the elastically deformable piece so that it does not displace to the position where it interferes with the other side when the relative positional relationship with the other side is shifted due to the movement of the valve plug because they provided, plug, locked in a predetermined position when no longer located within the deformation range of the elastic deformation pieces, so the valve will not interfere when closing operation is accompanied to the vertical movement of the valve plug Exerts the effect of controlling the opening and closing of the valve and ensuring the sealing performance
be able to.

Further, according to the present invention, the elastically deformable piece of the upper soft sheet adopting the self-sealing sheet structure is used.
Te, primary during valve opening, by elastically deformable configured downward or upward in the fluid pressure difference between the secondary side, the elastic strange
The shape piece is always in contact with the outer peripheral surface on the plug side to prevent gap flow, and further, it can have a function as a scraper for removing scale attached to the outer periphery of the plug .

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a configuration of a main part of a cage-type control valve showing one embodiment of a valve device according to the present invention.

FIG. 2 is an enlarged view showing a soft seal portion for obtaining a characteristic of closing a cage and a plug in FIG. 1,
2A is an enlarged sectional view of a main part, and FIG. 2B is an enlarged sectional view of a main part for explaining an operation state thereof.

FIG. 3 is a schematic sectional view showing a modified example of the valve device according to the present invention.

FIG. 4 is a schematic sectional view showing still another modified example of the valve device according to the present invention.

FIG. 5 is a schematic sectional view showing another embodiment of the valve device according to the present invention.

FIG. 6 is a schematic sectional view showing still another modified example of the valve device according to the present invention.

FIG. 7 is a schematic sectional view showing another modified example of the valve device according to the present invention.

FIG. 8 is a schematic sectional view showing an embodiment in which the valve device according to the present invention is applied to a cage type control valve having an inner and outer double cage.

FIG. 9 is a schematic cross-sectional view for explaining a schematic configuration of a conventional cage-type control valve.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Valve main body, 2 ... Partition wall, 3 ... Upstream passage, 4 ... Downstream passage, 5 ... Upper lid, 7 ... Cage, 7a ... Upper cage, 7
b: middle cage, 7c: lower cage, 11: flow control window (or flow control hole), 12: plug, 12a ...
Upper seat portion, 12b... Lower seat portion, 13
... Valve shaft, 14 ... Upper soft seat, 15 ... Lower soft seat, 20 ... Upper soft seat with self-sealing sheet structure, 21 ... Lower soft seat with self-sealing sheet structure, 22 ... Elastic deformation piece, 22a ... Circular contact part ,
23 pressure chamber for primary fluid pressure, 24 stopper, 24
a: locking portion, 25: metal seal portion, 26: second pressure chamber for secondary-side fluid pressure.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-81967 (JP, A) JP-B-3-31878 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16K 3/24

Claims (2)

(57) [Claims] 1. A cylindrical cage having a fluid control opening through which a fluid is selectively circulated in a valve body, a plug slidably operated in the cage to control the opening and closing of the opening, and an inner peripheral surface of the cage. Alternatively, one of the outer peripheral surfaces of the plug is provided at predetermined intervals in the axial direction at two upper and lower positions, and a pair of upper and lower annular soft sheets, and the inner peripheral surface of the cage or the outer periphery of the plug A valve seat provided on the other of the surfaces, the upper and lower soft seats being seated, and a pair of lower and upper seating seats , wherein the lower portion disposed at least below the soft seats
Place the soft seat on the lower end of the plug below the inner circumferential surface of the cage.
And selectively contactable elastic deformation piece seat bottom portion of the part,
With primary side fluid pressure on the rear side of the elastic deformation piece is configured to have a pressure chamber to be introduced, the elastic deformation piece in the lower soft sheet, the plug
When the valve opens, the projecting
A valve device provided with a locking means for locking in a state in which it does not come out . 2. A flow for selectively circulating a fluid in a valve body.
A cylindrical cage having a body control opening, and a sliding cage within the cage;
A plug that is operated and controls opening and closing of the opening;
Shaft on either the inner surface of the cartridge or the outer surface of the plug
It is provided at the upper and lower two positions at a predetermined interval in the line direction
A pair of upper and lower annular soft sheets and the cage
Provided on the other of the inner peripheral surface of the
The upper and lower soft seats sit on the upper and lower pair of seats
A valve unit having a seat portion, wherein an upper portion of the soft seat is arranged at least above the soft seat.
The soft seat can be selectively contacted with the seating section
Elastic deformation piece and the primary fluid on the back side of this elastic deformation piece
And a pressure chamber into which pressure is introduced.
To the elastic deformation pieces of the upper soft sheet, the primary side fluid
The second side in which the fluid pressure on the secondary side is led to the side opposite to the pressure chamber for pressure
The difference between these two pressure chambers
Due to the pressure, it comes into sliding contact with the seating part of the mating member.
A valve device configured to be elastically deformable as described above.