KR102339636B1 - Multi valve for vehicle - Google Patents

Abstract

The present invention discloses a multi-valve device for a vehicle. The multi-valve device for a vehicle according to the present invention includes a valve housing in which at least one port through which a fluid flows in or out, and at least one opening rotatably provided in the valve housing and selectively communicating with the port is formed. and a sealing member installed between the valve housing and the valve body so that the valve body part selectively opening and closing the port and at least one part are in close contact with the valve body part, and maintaining airtightness around the opening, , a recessed portion is formed on the outer peripheral surface of the valve body to have a distance from the central axis of the valve body smaller than a radius of the valve body, and a parting line generated in the manufacturing process of the valve body is formed in the recessed portion.

Description

Multi-valve device for vehicle {MULTI VALVE FOR VEHICLE}

The present invention relates to a multi-valve device for a vehicle for controlling the flow of a fluid such as coolant in a vehicle engine, and more particularly, a burr ( It relates to a multi-valve device for a vehicle capable of improving sealing properties between a valve body and a port by forming a depression on the outer peripheral surface of the valve body so that the burr does not contact the sealing member.

A vehicle driven by an internal combustion engine has various types of valve devices inside, and these valve devices are used for various types of fluids according to uses such as engine cooling, indoor space cooling/heating, exhaust gas recirculation (EGR system), etc. It is configured to distribute, control, or regulate the flow of

Among these valve devices, a valve device capable of controlling a flow path of a fluid in two or more directions is called a multi-way switching valve device or a multi-valve device, and such a multi-valve device may be mainly used in a coolant circulation circuit of an internal combustion engine engine.

On the other hand, in such a multi-valve device, a valve body rotatably installed inside the valve housing is installed in order to distribute the coolant in various directions, and the valve body is generally manufactured by an injection method by combining a plurality of molds.

At this time, a parting line is generated in the portion where the surface of the valve body and the plurality of molds contact each other, and irregularities due to burrs formed along the parting line are generated, and these irregularities are the parts of the rotary valve. When the sealing member is in close contact with the outer circumferential surface of the valve member, there is a problem in that the sealing surface of the sealing member is damaged by contact with the sealing member.

The present invention provides a recessed portion on the outer peripheral surface of the valve member so that the burr formed along the parting line generated in the manufacturing process of the valve body does not protrude to the outside of the outer peripheral surface of the valve body, so that when the sealing member is in close contact with the valve member, An object of the present invention is to provide a multi-valve device for a vehicle capable of preventing a burr from contacting a sealing member to prevent wear or deformation of the sealing member and improve sealing performance.

The multi-valve device for a vehicle according to an embodiment of the present invention includes a valve housing having at least one port through which a fluid is introduced or discharged, and an opening rotatably provided in the valve housing and selectively communicating with the port. at least one is formed, and is installed between the valve housing and the valve body so that the valve body part selectively opening and closing the port and at least one part are in close contact with the valve body part, and maintaining airtightness around the opening Including a sealing member, the outer peripheral surface of the valve body portion is formed with a depression in which a distance from the central axis of the valve body is smaller than a radius of the valve body is formed, and in the depression, parting generated in the manufacturing process of the valve body A line is formed.

In addition, the maximum depression depth of the depression is characterized in that the range of 0.05mm to 0.15mm.

In addition, the maximum depression depth of the depression is characterized in that it represents the distance from the center of the bottom surface of the depression to the extension line of the outer peripheral surface of the valve body portion.

In addition, a gap is formed between the valve body part and the sealing member by the depression, and a burr formed along the parting line by the gap does not contact the sealing member.

In addition, the circumferential width of the depression is in a proportional relationship with a value obtained by multiplying the maximum radial depth of the depression by the diameter of the valve body minus the maximum radial depth of the depression.

In addition, when the maximum radial depth of the depression is H, the radius of the valve body is R, and the circumferential width of the depression is W,

[formula]

It is characterized in that it satisfies

In addition, as the circumferential width (W) of the depression is adjusted, the maximum radial depth (H) of the depression is adjusted, and the maximum radial depth (H) of the depression is formed along the parting line. It is characterized in that it is adjusted to be larger than the length of the burr.

In addition, the burr formed along the parting line is characterized in that it is formed in the center of the depression.

In addition, the parting line is provided with any one of a straight line, a curved line, and a broken line.

In addition, the valve body part is formed by an injection method by a mold formed by combining a plurality of molds, and the recessed part is formed flat so that the edge of each mold corresponds to the shape of the recessed part, or has a protruding shape. It is characterized in that it is formed by forming.

In addition, the depression is formed in any one of a horizontal plane, a step shape, a V shape, and a semicircular shape.

In addition, the multi-valve device for a vehicle according to an embodiment of the present invention includes a valve housing having at least one port through which a fluid is introduced or discharged, and is rotatably provided in the valve housing, and selectively communicates with the port. at least one opening is formed, and is installed between the valve housing and the valve body so that the valve body part selectively opening and closing the port and at least one part are in close contact with the valve body part, and airtightness around the opening and a sealing member for holding the valve body, wherein a depression formed by being depressed to a predetermined depth in a radial direction of the outer peripheral surface of the valve body is formed on the outer peripheral surface of the valve body, and the maximum depression depth of the depression is at the center of the bottom surface of the depression. It means the distance to the extension line of the outer peripheral surface of the valve body, and the maximum depression depth of the depression is characterized in that it is regulated in a predetermined length range.

In addition, a parting line generated during the manufacturing process of the valve body part is formed in the recessed part, and a gap is formed between the valve body part and the sealing member by the recessed part, and the parting line is formed by the gap. It is characterized in that the formed burr does not contact the sealing member.

In addition, the maximum depression depth of the depression is characterized in that the range of 0.05mm to 0.15mm.

In addition, the circumferential width of the depression is in a proportional relationship with a value obtained by multiplying the maximum radial depth of the depression by the diameter of the valve body minus the maximum radial depth of the depression.

In addition, when the maximum radial depth of the depression is H, the radius of the valve body is R, and the circumferential width of the depression is W,

[formula]

It is characterized in that it satisfies

In addition, as the circumferential width (W) of the depression is adjusted, the maximum radial depth (H) of the depression is adjusted, and the maximum radial depth (H) of the depression is formed along the parting line. It is characterized in that it is adjusted to be larger than the length of the burr.

In addition, the valve body part is formed by an injection method by a mold formed by combining a plurality of molds, and the recessed part is formed flat so that the edge of each mold corresponds to the shape of the recessed part, or has a protruding shape. It is characterized in that it is formed by forming.

In addition, the depression is formed in any one of a horizontal plane, a step shape, a V shape, and a semicircular shape.

According to the present invention, it is possible to prevent the sealing member from directly contacting the burr formed along the parting line by forming a depression on the outer circumferential surface of the valve body, thereby preventing abrasion or deformation of the sealing surface of the sealing member, thereby sealing performance This rapidly decreasing problem can be solved.

In addition, by regulating the maximum depression depth of the depression in the range of 0.05 mm to 0.15 mm, the sealing area of the valve body portion is prevented from being narrowed and the burr generated during injection manufacturing of the valve body portion is covered by the maximum depression depth of the depression portion. It is possible to prevent the burr from protruding outward from the outer peripheral surface of the valve body.

1 is an exploded perspective view of a multi-valve device for a vehicle according to an embodiment of the present invention;
2 is a diagram schematically illustrating a process of manufacturing the valve body of the multi-valve device for a vehicle of FIG. 1 using a mold;
3 is a view schematically showing a form in which the sealing member is in close contact with the valve body of FIG. 1;
4 is a view showing a form in which a depression is formed in the valve body of FIG. 2 and a parting line is formed in the depression;
5 is a cross-sectional view of the valve body of FIG. 4 viewed from above;
6 is a view schematically showing the relationship between the radius (R) of the valve body of FIG. 5, the circumferential width (W) of the depression formed in the valve body portion, and the maximum depression depth (H) of the depression;
7 is a view illustrating various shapes of a depression according to an embodiment of the present invention as an example.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. However, the spirit of the present invention is not limited to such an embodiment, and the spirit of the present invention may be differently proposed by adding, changing, and deleting components constituting the embodiment, but this is also included in the scope of the present invention. will become

1 is an exploded perspective view of a multi-valve device for a vehicle according to an embodiment of the present invention.

1 and 2 , the multi-valve device 1 for a vehicle according to an embodiment of the present invention includes a valve housing 10 , a valve body 20 , and a sealing member 30 .

The multi-valve device 1 for a vehicle described in the present invention is applicable to various types of vehicles to which fuel sources such as gasoline, diesel, hybrid, electricity and hydrogen are applied. An example applied to the engine coolant circulation circuit will be described.

The multi-valve device 1 for a vehicle includes a valve housing 10 and a valve body 20 to open and close a flow path of a fluid including a vehicle coolant.

The valve housing 10 is provided with a plurality of ports 11, 12, 13 through which a fluid, for example, a coolant used in an engine can communicate, and a fluid such as coolant flows in or out through these ports 11, 12, 13. may leak.

The valve housing 10 may accommodate the valve body 20 therein, and first to third ports 11 , 12 , 13 respectively connected to the engine E, the radiator R, and the cooler C ) can be provided. Here, the first port 11 is connected to the engine (E) so that the heated coolant can be introduced, and the second and third ports (12, 13) provide coolant to the radiator (R) and the cooler (C), respectively. can be discharged

The positions of the first to third ports 11, 12, and 13 illustrated in FIG. 1 are exemplary and not limited thereto. In addition, the number of ports is not limited to the first to third ports 11 , 12 , and 13 , and the number of ports may vary according to an application target.

The valve body 20 may be rotatably installed inside the valve housing 10 . The valve body 20 may be coupled to a rotation shaft rotatably coupled to the valve housing 10 . An actuator such as a driving motor or other electric element may be connected to the rotation shaft coupled to the valve body 20 , and may be rotated by receiving power from the actuator.

A plurality of ports 11 , 12 , 13 inlets may be disposed around the outer peripheral surface of the valve body 20 , and each port 11 , 12 , 13 formed in the valve housing 10 in the valve body 20 . ) and selectively communicating with the openings 21 and 22 may be formed at least one or more. The openings 21 and 22 may be formed by cutting the outer peripheral surface of the valve body 20 into a predetermined shape.

When the openings 21 , 22 of the valve body 20 and the ports 11 , 12 and 13 communicate with each other, a fluid such as coolant flows into the valve body 20 through the ports 11 , 12 and 13 . It may be introduced into the formed chamber, and a fluid such as coolant may flow out from the chamber inside the valve body 20 to the port P.

On the contrary, when the ports 11, 12, 13 are blocked by the outer peripheral surface where the openings 21 and 22 of the valve body 20 are not formed, the corresponding ports 11, 12, 13 are shielded, and the corresponding ports ( 11, 12, 13), the fluid such as coolant cannot flow out or flow in.

Accordingly, it is preferable that the openings 21 and 22 have a size corresponding to the respective ports 11 , 12 and 13 .

A chamber in which a fluid may be accommodated may be formed in the valve body 20 . The chamber is an empty space formed inside the valve body 20 , and may serve as a flow path through which a fluid such as cooling water may flow, or may provide a space in which a fluid such as cooling water may be temporarily accommodated.

The sealing member 30 may be provided between the valve housing 10 and the valve body 20 . The sealing member 30 airtightly seals between the plurality of ports 11 , 12 , 13 and the valve body 20 , and at least a portion may be in close contact with the outer circumferential surface of the valve body 20 , and the valve body It is possible to maintain airtightness around the openings 21 and 22 formed in the portion 20 .

The sealing member 30 is in close contact with the periphery of the openings 21 and 22 formed in the valve body 20 so that the fluid flows through the openings 21 and 22 of the valve body 20 through the ports 11, 12, 13) or when the fluid flows into the openings 21 and 22 of the valve body 20 through the ports 11, 12, 13 or the outside of the valve body 20 or the valve body 20 It is possible to prevent a fluid such as coolant from leaking between the and the valve housing 10 .

The sealing member 30 may be installed in each port 11 , 12 , 13 , and preferably may be disposed between the valve body 20 and the ports 11 , 12 , 13 .

The sealing member 30 may be formed in a circular shape to correspond to the shape of the ports 11 , 12 , and 13 , and a through hole through which a fluid such as cooling water may pass may be formed in the central portion.

Figure 2 is a view showing the manufacturing of the valve body portion of the multi-valve device for the vehicle of Figure 1 using a mold, Figure 3 is a view schematically showing the form in which the sealing member is in close contact with the valve body portion of Figure 1, 4 is a view showing a form in which a depression is formed in the valve body of FIG. 2 and a parting line is formed in the depression, FIG. 5 is a cross-sectional view of the valve body of FIG. 4 from above, and FIG. 6 is the valve of FIG. It is a view schematically showing the relationship between the radius (R) of the body portion, the circumferential width (W) of the depression formed in the valve body portion, and the maximum depression depth (H) of the depression.

2 to 6 , on the outer circumferential surface of the valve body 20 , a depression 40 formed by being depressed to a predetermined depth in the radial direction of the outer circumferential surface of the valve body 20 may be provided.

As the recessed part 40 is formed by being recessed to a predetermined depth in the radial direction of the outer peripheral surface of the valve body part 20 , the distance from the central axis of the valve body part 20 to the depression part 40 is the valve body part. It may be formed smaller than the radius of (20).

The recessed part 40 may be formed in a horizontal plane on the outer peripheral surface of the valve body part 20 . The depression 40 may have a predetermined width and may be formed to extend from the upper end of the valve body 20 to the lower end.

In more detail, this depression 40 is a part formed so that a portion of the outer peripheral surface of the valve body 20 formed as a whole is a curved surface to be a horizontal surface, and the shape of the valve body 20 is formed in the process of being manufactured by injection. can be determined.

Of course, the shape of the depression 40 is not limited to a flat horizontal plane, and may be formed in various shapes such as a step shape, a V shape, a semicircle shape, etc. as shown in FIG. 7 .

Referring to FIG. 2 , the valve body 20 may be manufactured by an injection method by a mold in which a plurality of molds M are coupled.

In order to form the depression 40 in the valve body 20 , a portion of the inner circumferential surface of the mold M may be formed to have a flat surface or a protruding surface to correspond to the shape of the depression 40 . In other words, the shape of the outer circumferential surface of the valve body 20 may be deformed by adjusting the shape of the inner circumferential surface of the mold M, and the depression 40 may be formed in a desired portion of the valve body 20 .

Specifically, it is preferable that the recessed portion 40 be formed in the part where the parting line 50 is formed in the valve body 20 . Since the part where the parting line 50 is formed in the valve body 20 is the part where each mold M is coupled, the part where each mold M is coupled, that is, the edge part of each mold M The recessed part 40 may be formed in the valve body 20 by forming it flat to correspond to the shape of the recessed part 40 or forming it in a protruding shape.

In this way, a parting line 50 generated in the manufacturing process of the valve body part 20 may be formed in the recessed part 40 , and a burr 60 is formed along the parting line 50 . can be The burr 60 is a part where the mold M abuts, and the resin for manufacturing the valve body 20 leaks out to form a protruding shape.

Referring to FIG. 5 , the recessed part 40 is made by making the part where the parting line 50 is formed in the valve body part 20 in a horizontal plane, and is sealed with the valve body part 20 by the recessed part 40 . A gap may be formed between the members 30 .

By forming a gap between the valve body part 20 and the sealing member 30 in this way, it is possible to prevent the sealing member 30 from directly contacting the burr 60 formed along the parting line 50, thereby Accordingly, it is possible to prevent abrasion or deformation of the sealing surface of the sealing member 30 to solve the problem that the sealing performance is rapidly deteriorated.

Specifically, the maximum depression depth (H) of the depression 40 is preferably in the range of 0.05 mm to 0.15 mm.

The maximum depression depth H of the depression 40 means a distance from the center of the bottom surface of the depression portion 40 to an imaginary extension line of the outer peripheral surface of the valve body portion 20 . In more detail, the extension line of the outer circumferential surface of the valve body 20 is a portion marked with a dotted line on the outer circumferential surface of the valve body 20 as shown in FIG. 5 , that is, before the depression 40 is formed. As meaning the outer peripheral surface of (20), the maximum depression depth (H) of the depression 40 means the distance between the extension line and the center of the bottom surface of the depression portion 40 .

The maximum depression depth H of the depression 40 is in the range of 0.05 mm to 0.15 mm while covering the maximum length of the burr 60 formed in the injection process of the valve body 20, while having a spherical valve body This is to maintain the sealing effect of the part 20 .

Since the maximum height of the burr 60 formed during general injection molding can be formed up to 0.05 mm, when the maximum depression depth (H) of the depression 40 is less than 0.05 mm, the sealing member 30 is separated from the burr 60 and Since the sealing surface may be damaged by contact, the maximum depression depth (H) of the depression 40 is preferably formed to be higher than 0.05 mm.

In addition, when the maximum depression depth H of the depression 40 is formed to be greater than 0.15 mm, the area sealed by the sealing member 30 is narrowed, so that the sealing effect by the sealing member 30 is reduced. Since it may occur, it is preferable that the maximum depression depth (H) of the depression portion 40 is formed to be smaller than 0.15 mm.

More specifically, the valve body portion 20 of the depression portion 40 such that the range of the maximum depression depth H of the depression portion 40 formed in the valve body portion 20 is in the range of 0.05 mm to 0.15 mm. The circumferential width W may be determined by the following equation (see FIG. 6 ).

[formula]

(Where H is the maximum depression depth of the depression, R is the radius of the valve body, and W is the width of the depression.)

The circumferential width W of the depression 40 is the maximum radial depth H of the depression 40 and the diameter 2R of the valve body 20 in the radial direction of the depression 40 . It has a proportional relationship with the value multiplied by the subtraction depth (H).

According to the above formula, as the maximum depression depth H of the depression 40 increases, the width W of the depression 40 increases. As a result, the area sealed by the sealing member 30 is reduced and the sealing effect can be reduced. As described above, the maximum depression depth H of the depression 40 is preferably formed to be smaller than 0.15 mm as described above.

In addition, according to the above formula, by adjusting the circumferential width (W) of the depression (40), the maximum radial depth (H) of the depression (40) can be adjusted, and thus the depression (40) The maximum radial depth (H) of the dent is adjusted to be larger than the length of the burr formed along the parting line (50).

As an example, when the radius (R) of the valve body portion 20 is 29.5 mm and the maximum depression depth (H) of the burr 60 that can be covered in the depression portion 40 is 0.05 mm, the width ( W) is,

가 되고,

become,

When the maximum depression depth (H) of the burr 60 that can be covered in the depression portion 40 is 0.15 mm, the width W of the depression portion 40 is,

가 될 수 있다.

can be

In other words, when the radius R of the valve body 20 is 29.5 mm, the width of the depression 40 such that the maximum depression depth H of the depression 40 is in the range of 0.05 mm to 0.15 mm (W) is preferably regulated in the range of 3.4 mm to 6 mm.

Accordingly, the maximum coverable depth of depression H of the burr 60 generated during injection manufacturing of the valve body 20 can be maintained in an appropriate range without reducing the sealing area of the valve body 20 too much. .

7 is a view illustrating various shapes of a depression according to an embodiment of the present invention as an example.

The groove shape of the recessed part 40 may form a part of the outer peripheral surface of the valve body 20 in a horizontal plane as shown in FIG. 3 or FIG. 5, and alternatively, as shown in FIG. 7(a)), a V-shape (refer to FIG. 7(b)), and a semicircle (refer to FIG. 7(c)) may be formed in various shapes.

As such, in order to form the shape of the recessed part 40 in various shapes, the shape of the inner peripheral surface of the mold M is formed into a protruding shape to correspond to the shape of the recessed part 40 to adjust the shape of the recessed part 40 It is the same as described above.

The maximum depression depth (H) of the depression 40 is preferably in the range of 0.05 mm to 0.15 mm as described above, even when the shape is a step-shaped, V-shaped, or semi-circular shape.

In addition, the parting line 40 formed along the recessed part 40 is a straight line, a curved line, or a broken line along a vertical direction (meaning the rotation axis direction of the valve body 20 ) on the outer peripheral surface of the valve body part 20 . and the like may be variously configured.

The embodiments of the present invention are merely exemplary, and those of ordinary skill in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Accordingly, the true scope of protection of the present invention should be defined only by the appended claims.

1: Multi-valve device for vehicles
10: valve housing
11, 12, 13: Port
20: valve body portion
21, 22: opening
30: sealing member
40: depression
50: parting line
60: burr (burr)

Claims (19)

a valve housing in which at least one port through which a fluid flows in or out is formed;
a valve body rotatably provided in the valve housing, having at least one opening selectively communicating with the port, and selectively opening and closing the port; and
a sealing member installed between the valve housing and the valve body so that at least a portion is in close contact with the valve body, and maintaining airtightness around the opening;
including,
A depression is formed on the outer peripheral surface of the valve body, the distance from the central axis of the valve body being smaller than the radius of the valve body,
A multi-valve device for a vehicle in which a parting line generated in the manufacturing process of the valve body is formed in the depression. According to claim 1,
The maximum depression depth of the depression is a multi-valve device for a vehicle, characterized in that in the range of 0.05mm to 0.15mm. 3. The method of claim 2,
The maximum depression depth of the depression is a multi-valve device for a vehicle, characterized in that it represents a distance from the center of the bottom surface of the depression to an extension line of the outer peripheral surface of the valve body. 4. The method of claim 3,
A gap is formed between the valve body and the sealing member by the depression, and a burr formed along the parting line by the gap does not contact the sealing member. Device. The method of claim 1,
The circumferential width of the depression is proportional to the value obtained by multiplying the maximum radial depth of the depression by the diameter of the valve body minus the maximum radial depth of the depression. . 6. The method of claim 5,
When the maximum radial depth of the depression in the radial direction is H, the radius of the valve body is R, and the circumferential width of the depression is W,
[formula]

A multi-valve device for a vehicle, characterized in that it satisfies 5. The method of claim 4,
As the circumferential width (W) of the depression is adjusted, the maximum radial depth (H) of the depression is adjusted, and the maximum radial depth (H) of the depression is the burr ( A multi-valve device for a vehicle, characterized in that it is adjusted to be greater than the length of the burr). 5. The method of claim 4,
The burr formed along the parting line is a multi-valve device for a vehicle, characterized in that it is formed in the center of the depression. The method of claim 1,
The parting line is a multi-valve device for a vehicle provided in any one of a straight line, a curved line, and a broken line. According to claim 1,
The valve body portion is formed by an injection method by a mold formed by combining a plurality of molds,
The recessed portion, the multi-valve device for a vehicle, characterized in that the rim portion of each mold is formed by forming a flat shape to correspond to the shape of the recessed portion, or formed in a protruding shape. 11. The method of claim 10,
The multi-valve device for a vehicle in which the depression is formed in any one of a horizontal plane, a step shape, a V shape, and a semicircle shape. a valve housing in which at least one port through which a fluid flows in or out is formed;
a valve body rotatably provided in the valve housing, having at least one opening selectively communicating with the port, and selectively opening and closing the port; and
a sealing member installed between the valve housing and the valve body so that at least a portion is in close contact with the valve body, and maintaining airtightness around the opening;
including,
A depression is formed on the outer circumferential surface of the valve body by being recessed to a predetermined depth in the radial direction of the outer circumferential surface of the valve body,
The maximum depression depth of the depression means a distance from the center of the bottom surface of the depression to an extension line of the outer peripheral surface of the valve body, and the maximum depression depth of the depression is regulated in a predetermined length range Multi-valve device for a vehicle, characterized in that . 13. The method of claim 12,
A parting line generated in the manufacturing process of the valve body is formed in the recessed part,
A gap is formed between the valve body and the sealing member by the depression, and a burr formed along the parting line by the gap does not contact the sealing member. Device. 13. The method of claim 12,
The maximum depression depth of the depression is a multi-valve device for a vehicle, characterized in that in the range of 0.05mm to 0.15mm. 13. The method of claim 12,
The circumferential width of the depression is proportional to the value obtained by multiplying the maximum radial depth of the depression by the diameter of the valve body minus the maximum radial depth of the depression. . 16. The method of claim 15,
When the maximum radial depth of the depression in the radial direction is H, the radius of the valve body is R, and the circumferential width of the depression is W,
[formula]

A multi-valve device for a vehicle, characterized in that it satisfies 14. The method of claim 13,
As the circumferential width (W) of the depression is adjusted, the maximum radial depth (H) of the depression is adjusted, and the maximum radial depth (H) of the depression is the burr ( A multi-valve device for a vehicle, characterized in that it is adjusted to be greater than the length of the burr). 13. The method of claim 12,
The valve body portion is formed by an injection method by a mold formed by combining a plurality of molds,
The recessed portion, the multi-valve device for a vehicle, characterized in that the rim portion of each mold is formed by forming a flat shape to correspond to the shape of the recessed portion, or formed in a protruding shape. 19. The method of claim 18,
The multi-valve device for a vehicle in which the depression is formed in any one of a horizontal plane, a step shape, a V shape, and a semicircle shape.

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