JP4112918B2 - Valve device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a valve device having a configuration in which a valve body slides on a surface side of a valve seat plate through which a fluid inlet and a fluid outlet pass in a thickness direction. More specifically, the present invention relates to the structure of a valve seat plate used in the valve device.
[0002]
[Prior art]
In a refrigerator, a common refrigerant (fluid) is distributed for cooling a plurality of warehouses, and a valve device for cooling the inside of each warehouse has a refrigerant flow as shown in FIGS. 10 (A) and 10 (B). A valve seat plate 13 'through which the inlet 13c and the refrigerant outlets 13a and 13b penetrate in the thickness direction, and a sealed case (not shown) that covers the surface side of the front and back sides of the valve seat plate 13' A valve body (not shown) that opens and closes the outlets 13a and 13b by sliding on the surface of the valve seat plate 13 'is used. Further, the rotor support shaft 18 and the valve body support shaft 35 are fixed to the valve seat plate 13 '.
[0003]
In the valve seat plate 13 ′, the inlet 13c and the outlets 13a and 13b are formed as stepped holes having a small diameter on the front side and a large diameter on the back side, and are provided on the back side of the inlet 13c and the outlets 13a and 13b. The large-diameter portion is a pipe insertion hole, and is brazed to each of the inflow pipe 28c and the outflow pipes 28a and 28c in a state where the tips of the inflow pipes 28a and 28c abut against the stepped portions.
[0004]
[Problems to be solved by the invention]
In the valve device configured in this manner, at least a portion of the surface of the valve seat plate 13 'where the valve body slides is required to have high surface accuracy so that the refrigerant can be completely shut off. The valve seat plate 13 'must be fixed with the pipes 28a, 28b, 28c inserted at least 2 mm to 5 mm, and is heated to a brazing temperature, for example, 1000 ° C. or more. However, it is required to be thick so that distortion does not occur. Further, the valve seat plate 13 'is required to be an iron-based material so that it can be brazed, and SUS is used from the viewpoint of corrosion resistance.
[0005]
For this reason, conventionally, when manufacturing the valve seat plate 13 ′, it is necessary to perform cutting (lace processing) on the thick SUS, so that the cost of the valve seat plate 13 ′ is high. There is.
[0006]
Therefore, a method of manufacturing the valve seat plate by forging instead of cutting may be considered, but forging is not as much as cutting, but is a costly processing method. Moreover, it is difficult to obtain high accuracy in high dimensions and hole positions by forging. Further, in the case of forging, since the residual stress is large, there is a problem that, when brazing is performed, a surface requiring high accuracy is distorted by the heat.
[0007]
A method of manufacturing the valve seat plate by sintering molding instead of cutting processing is also conceivable, but sintering molding is not as expensive as cutting processing, but is a costly processing method. Moreover, in the case of a sintered body, it is necessary for the sealing treatment, but the resin impregnation which is a general sealing treatment cannot withstand the temperature when the resin is brazed. Further, since the sintered body has a low surface hardness, there is a problem that the resistance to sliding of the valve body is low. Furthermore, in sintering, since the lower limit of the hole diameter that can be formed is limited, for example, in order to form a hole of 1.5φ, there is a problem in that cutting must be performed as secondary processing.
[0008]
Here, the inventor of the present application supports the pipe for connecting the pipe to the valve seat plate on which the valve body slides, in the case where the valve seat plate is conventionally constituted by one plate. A structure in which plates are laminated is proposed. However, in order to adopt such a structure, it is necessary to ensure airtightness at the joining portion of the two plates, and if this is done by brazing, the amount of brazing material will increase and quality will increase. The stability of the film is impaired and the cost becomes high. In addition, when the amount of brazing material is large, if the plates to be joined are made of different materials, the coefficient of thermal expansion will be different, so that the surface that requires high accuracy will be distorted by the heat of brazing. is there.
[0009]
In view of the above problems, the problem of the present invention is to reduce the manufacturing cost by adopting a structure in which a pipe support plate for connecting a pipe to a valve seat plate on which a valve body slides is laminated, And it is providing the valve apparatus which was excellent also in quality by employ | adopting a new sealing structure for the junction part of a plate.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, in the present invention, the refrigerant inlet and the valve outlet plate through which the refrigerant outlet penetrates in the thickness direction, and the surface side of the front side and the rear side of the valve seat plate are covered. In the valve device having the sealing case attached to the surface portion of the valve seat plate and the valve body that slides on the surface of the valve seat plate to open and close the inlet or the outlet. Pipe insertion holes communicating with the inlet and the outlet are respectively formed, a pipe support plate stacked on the back side of the valve seat plate, and an end portion fixed in the pipe insertion hole of the pipe support plate, and a inlet pipe and outlet pipe respectively communicating with the inlet and the outlet, the outer peripheral side of the junction surface between the valve seat plate and the pipe support plate sealed airtight by a metal thin film Characterized in that it is.
[0011]
In the present invention, a structure in which a pipe support plate for connecting pipes is laminated to the valve seat plate on which the valve body slides is adopted, so each plate has a simple structure, It can be manufactured at low cost. For example, if the inlet and outlet formed in the valve seat plate are small-diameter straight holes and the pipe insertion hole formed in the pipe support plate is a large-diameter straight hole, it is stepped by simply laminating two plates. Can be formed. Therefore, the pipe can be fixed in a state where the tip of the pipe is in contact with the step portion of the hole, and a plate having such a straight hole can be manufactured by pressing. Further, in order to ensure airtightness at the outer peripheral edge of the joining surface of the two plates, in the present invention , a metal thin film is used in a state where the two plates are laminated, and brazing is not adopted for sealing the portion. For this reason, since it is not necessary to perform brazing over a wide range, the valve seat plate or the like is not distorted. Therefore, a high quality valve device can be manufactured at low cost.
[0012]
In the present invention, the end portions of the inflow pipe and the outflow pipe are brazed, for example, in the pipe insertion hole. If comprised in this way, a pipe can be reliably fixed to the pipe insertion hole in the state which ensured airtightness. Further, if brazing is performed on such a narrow portion, the plate will not be distorted by the heat.
[0013]
Further, in the present invention, the valve seat plate and the pipe support plate are laminated so that both end portions thereof are displaced, and a step portion is formed on an outer peripheral edge of the joint surface, and the metal thin film includes the step portion. The film thickness of the part formed in this is thicker than the film thickness of the part formed in the other region. If comprised in this way, sealing can be performed reliably.
[0014]
Furthermore, in the present invention, the metal thin film is, for example, a plating film applied in a state where the valve seat plate and the pipe support plate are laminated, and is melted by heat at the time of brazing and caused by surface tension. Due to the concentration, the thickness of the portion formed in the step portion is thicker than the thickness of the portion formed in the other region. If comprised in this way, since the film thickness of the part which seals is thick, it can seal reliably.
[0015]
In the present invention, it is preferable that both the valve seat plate and the pipe support plate are press-processed products.
[0016]
In the present invention, when a shaft hole into which a rotation center shaft of a gear for driving the valve body is inserted is formed in the valve seat plate and the pipe support plate, the rotation center shaft is also And brazed in the shaft hole. If comprised in this way, a rotation center axis | shaft can be reliably fixed to the shaft hole in the state which ensured airtightness. Further, if brazing is performed on such a narrow portion, the plate will not be distorted by the heat.
[0017]
In the present invention, the metal thin film is, for example, a nickel plating film. With such a metal material, the nickel plating film can be melted by the heat during brazing, and therefore, when performing brazing, the metal thin film can be easily and reliably concentrated on the stepped portion.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
An example of a refrigerant distribution device for a refrigerator to which the present invention is applied will be described with reference to the drawings.
[0020]
FIG. 1 is a longitudinal sectional view of a refrigerant distribution device for a refrigerator to which the present invention is applied. 2A to 2F are explanatory diagrams of the respective modes in the refrigerant distributor shown in FIG. FIG. 3 is a longitudinal sectional view and a bottom view of the flow path constituting member of the valve device used in the refrigerant distributor shown in FIG.
[0021]
In FIG. 1, the refrigerant distribution device 1 according to the present embodiment includes a flow path component member 11 provided with a valve seat plate 13 and a valve device 1 a including a sealing case 19 placed on the surface side of the flow path component member 11. have.
[0022]
In the valve device 1a, a stepping motor 10 is configured as a valve driving device for driving the valve body by using the inside and outside of the sealed case 19. In the stepping motor 10, the rotor 15 is disposed inside the sealed case 19, while the stator 16 is disposed on the outer peripheral side of the sealed case 19. A lead wire 16b is drawn from the fixed coil 16a of the stator 16, and a drive signal is output to the lead wire 16b from a control unit (not shown) provided with a microcomputer to rotate and stop the rotor 15. To control.
[0023]
In the rotor 15, a magnet 15 a is integrally formed on the outer peripheral side, and a pinion 17 is formed at an end of the flow path component 11. The pinion 17 is in a state of being supported rotatably with respect to the rotor support shaft 18 (rotation center axis).
[0024]
The lower end side of the sealed case 19 has an enlarged diameter, constitutes a step on which the stator 16 is placed, and closely fits with a step 135 formed on the outer peripheral edge of the valve seat plate 13.
[0025]
In the valve device 1a, an inflow port 13c communicating with the inflow pipe 28c to which the refrigerant is supplied opens on the surface of the flow path component 11 on the side of the sealed case 19. On the other hand, in the region opposite to the inflow port 13c with respect to the pinion 17, the first outflow pipe 28a and the second outflow pipe 28b communicated with the first outflow pipe 28b for supplying the refrigerant into each refrigerator. 1 outflow port 13a and 2nd outflow port 13b are opening (refer to Drawing 2 (A)).
[0026]
A valve body support shaft 35 (rotation center axis) is formed in the vicinity of the first outflow port 13a and the second outflow port 13b. The valve body support shaft 35 has a valve body 30 integrated with a gear 36. Is formed. In this embodiment, the valve body 30 is used as a common valve body that slides on the surface of the valve seat plate 13 to open and close the first outlet 13a and the second outlet 13b.
[0027]
Here, the gear 36 meshes with the pinion 17 and is driven to rotate around the valve body support shaft 35 by the stepping motor 10. Accordingly, the valve body 30 is also rotationally driven by the stepping motor 10.
[0028]
Therefore, the first outlet 13a is closed and the second outlet 13b is in the closed-closed mode, the first outlet 13a is closed and the second outlet 13b is closed. -The open mode is set, the first outlet 13a and the second outlet 13b are both in the open-open mode, the first outlet 13a is in the open state, and the second outlet 13b is in the closed state. If the angular position of the valve body 30 (the area shown by the hatching in FIG. 2) is controlled in the open-close mode, the closed-closed origin position (0 step) shown in FIG. ) Shown in FIG. 2C, closed-open mode shown in FIG. 2C (100 steps), open-open mode shown in FIG. 2D (154 steps), and FIG. The open-close mode (step 195) shown in FIG. 2 and the end-point position of open-close shown in FIG. It can be realized in this order.
[0029]
In the valve device 1a configured as described above, the flow path component 11 is made of SUS in which the inflow port 13c and the outflow ports 13a and 13b penetrate in the thickness direction, as shown in FIGS. And a pipe support plate 14 made of oxygen-free copper in which pipe insertion holes 14a, 14b, 14c communicating with the outlets 13a, 13b and the inlet 13c, respectively, are formed. The plate 14 is laminated on the back side of the valve seat plate 13.
[0030]
Here, the pipe insertion holes 14a, 14b, 14c, the outflow ports 13a, 13b, and the inflow port 13c are all formed as straight holes, but the pipe insertion holes 14a, 14b, 14c are connected to the outflow port 13a. , 13b and the inlet 13c. For this reason, these holes constitute a stepped hole having a stepped portion at a joint portion between the valve seat plate 13 and the pipe support plate 14 in a state where they are communicated with each other. Accordingly, the outflow pipes 28a and 28b and the inflow pipe 28c are fixed by brazing in a state where the tip end portion is in contact with the stepped portion (the back surface of the valve seat plate 13) in the pipe insertion holes 14a, 14b and 14c. . Further, the brazing material used at this time enters each gap, as will be described later with reference to FIG. 9B, and the pipe insertion holes 14a, 14b, 14c, the outflow pipes 28a, 28b, and the inflow pipe 28c. In addition, airtightness between the valve seat plate 13 and the pipe support plate 14 is ensured around the leading end portions of the outflow pipes 28a and 28b and the inflow pipe 28c.
[0031]
Further, shaft holes 13d, 14d, 13e, and 14e into which the proximal end sides of the rotor support shaft 18 and the valve body support shaft 35 are press-fitted are formed as straight holes in the valve seat plate 13 and the pipe support plate 14, The base end side of the rotor support shaft 18 is fixed to the shaft holes 13d and 14d by brazing, and the base end side of the valve body support shaft 35 is fixed to the shaft holes 13e and 14e by brazing. Also, the brazing material used at this time enters the gaps, as will be described later with reference to FIG. 9B, and is between the shaft holes 14 d and 14 e, the rotor support shaft 18, and the valve body support shaft 35. Airtightness is secured.
[0032]
Here, since the valve seat plate 13 has a larger diameter than the pipe support plate 14, a stepped seat 111 is formed on the outer peripheral edge of the joint surface between the valve seat plate 13 and the pipe support plate 14. .
[0033]
Further, as will be described later, the valve seat plate 13 and the pipe support plate 14 are nickel plated on the surface in a state where they are laminated, and the metal thin film 5 made of the nickel plating film formed by this plating forms a step. In the part 111, the outer peripheral edge of the joint surface between the valve seat plate 13 and the pipe support plate 14 is sealed. However, the metal thin film 5 is melted by the heat at the time of brazing described above, and after being concentrated on the stepped base 111 by the surface tension, the metal thin film 5 is cooled and solidified. For this reason, the metal thin film 5 was formed with the same film thickness when plated, but in the state after brazing, the film thickness of the portion formed in the stepped portion 111 is in other regions. It is thicker than the film thickness of the formed part.
[0034]
[Manufacturing method of flow path component]
With reference to FIGS. 4 to 9, the configuration of the flow path component member 11 will be described in detail while explaining the method for manufacturing the flow path component member 11.
[0035]
FIGS. 4A, 4 </ b> B, and 4 </ b> C are a plan view, a longitudinal cross-sectional view, and a bottom view of the valve seat plate 13 used for the flow path component 111, respectively. 5A and 5B are a plan view and a longitudinal sectional view of the pipe support plate 14 used for the flow path constituting member 111, respectively. 6A and 6B, the valve seat plate shown in FIGS. 4A, 4B, and 4C and the pipe support plate 14 shown in FIGS. 5A and 5B are laminated. It is the top view of the state which carried out, and a longitudinal cross-sectional view. FIGS. 7A and 7B are plan views after performing nickel plating in a state where the valve seat plate 13 and the pipe support plate 14 are laminated as shown in FIGS. 6A and 6B, respectively. FIG. 8 (A) and 8 (B), respectively, after nickel plating is applied to the valve seat plate 13 and the pipe support plate 14 as shown in FIGS. 7 (A) and 7 (B), the surface of the valve seat plate 13 is removed. It is the top view after grinding | polishing, and a longitudinal cross-sectional view. 9A and 9B, the rotor support shaft 18, the valve body support shaft 35, the outflow pipes 28a and 28b, and the inflow pipe 28c are temporarily provided on a laminate of the valve seat plate 13 and the pipe support plate 14, respectively. It is the top view of the state fixed by brazing after stopping, and a longitudinal section.
[0036]
In this embodiment, when the flow path component 11 is manufactured, first, as shown in FIGS. 4A, 4B, and 4C, the SUS plate is pressed, and the inlet 13c and the outlet 13a are processed. , 13b and shaft holes 13d, 13e form a valve seat plate 13 formed as straight holes. In addition, a step 135 serving as a fitting portion of the sealing case 19 is formed on the outer peripheral portion on the surface side of the valve seat plate 13. Further, a temporary fixing protrusion 13f is formed on the back surface side of the valve seat plate 13.
[0037]
On the other hand, as shown in FIGS. 5 (A) and 5 (B), a pipe support in which an oxygen-free copper plate is pressed to form pipe insertion holes 14a, 14b, 14c and shaft holes 14d, 14e as straight holes. Plate 14 is formed. The pipe support plate 14 is also formed with a temporary fixing hole 14f into which the temporary fixing protrusion 13f of the valve seat plate 13 is press-fitted.
[0038]
Next, as shown in FIGS. 6A and 6B, a pipe support plate 14 is laminated on the back side of the valve seat plate 13. At that time, the temporary fixing protrusion 13f described with reference to FIGS. 4 and 5 is press-fitted into the temporary fixing hole 14f.
[0039]
Next, the plate of the valve seat plate 13 and the pipe support plate 14 is subjected to electrolytic plating, and as shown in FIGS. 7A and 7B, the entire surface and each hole are made of a nickel plating film. A metal thin film 5 (a portion indicated by a thick line in FIG. 7B) is formed with a uniform film thickness.
[0040]
Next, the surface of the valve seat plate 13 is polished to form a valve body sliding surface with high surface accuracy. As a result, the metal thin film 5 is removed on the surface of the valve seat plate 13 as shown in FIGS.
[0041]
Next, since the shaft holes 13d and 14d communicate with each other and the shaft holes 13e and 14e communicate with each other in a state in which the valve seat plate 13 and the pipe support plate 14 are laminated, as shown in FIGS. 9 (A) and 9 (B). As described above, the rotor support shaft 18 and the valve body support shaft 35 are press-fitted from the pipe support plate 14 side.
[0042]
Next, the leading ends of the outflow pipes 28a, 28b and the inflow pipe 28c are inserted into the pipe insertion holes 14a, 14b, 14c of the pipe support plate 14.
[0043]
Thereafter, brazing using a brazing material 6 such as nickel is performed at the distal end portions of the outflow pipes 28a, 28b and the inflow pipe 28c, the base end portion of the rotor support shaft 18, and the base end portion of the valve body support shaft 35, Fix them. As a result, as shown by a thick line in FIG. 9B, the brazing material 6 ensures airtightness in the hole or the like. Further, the metal thin film 5 is melted by the heat at the time of brazing, and is concentrated on the stepped base 111 as shown in FIGS. 3A and 3B by surface tension. Since the nickel metal thin film 5 is also formed on the valve seat plate 13 made of SUS, the adhesion between the valve seat plate 13 and the brazing material 6 is good in the hole. In this manner, the valve seat plate 13 and the pipe support plate 14 are fixed, and their joint surfaces are sealed with the brazing material 6 and the metal thin film 5.
[0044]
[Effect of this embodiment]
As described above, in this embodiment, a structure in which the pipe support plate 14 for connecting the pipes is stacked on the valve seat plate 13 on which the valve body 30 slides is employed. Since the structure is simple, it can be manufactured at low cost. That is, if the inlet 13c and outlets 13a, 13b formed in the valve seat plate 13 are small-diameter straight holes, and the pipe insertion holes 14a, 14b, 14c formed in the pipe support plate 14 are large-diameter straight holes. A stepped hole can be formed by simply laminating the two plates 13 and 14. Therefore, the pipes 28a, 28b, 28c can be fixed in a state where the tips of the pipes 28a, 28b, 28c are in contact with the stepped portions of the holes, and the plates 13, 14 having such straight holes can be used. For example, it can be manufactured at low cost by pressing. Further, in order to ensure airtightness at the outer peripheral edge of the joining surface of the two plates 13 and 14, the metal thin film 5 formed by plating in a state where the two plates 13 and 14 are laminated is used. Therefore, since it is not necessary to braze over a wide range, the valve seat plate 13 is not distorted. Therefore, according to this embodiment, the high quality valve device 1a can be manufactured at low cost.
[0045]
Further, since brazing is used to fix the inflow pipe 28c, the outflow pipes 28a and 28b, the rotor support shaft 18, and the valve body 35, these shafts can be fixed in a state where airtightness is ensured. Further, if brazing is applied to such a narrow portion, the valve seat plate 13 is not distorted by the heat.
[0046]
Further, in this embodiment, the valve seat plate 13 and the pipe support plate 14 are laminated so that both end portions thereof are displaced, and a stepped portion 111 is formed on the outer peripheral edge of the joint surface. Thus, the metal thin film 5 is formed thick on the step portion 111. For this reason, sealing can be performed reliably.
[0047]
[Other embodiments]
The material of the metal thin film 5 is not limited to nickel, but may be other metals. Furthermore, the brazing material 6 is not limited to nickel but may be silver brazing.
[0048]
For the pipe support plate 14, the punching of a copper plate is used, but a thin general steel plate may be used. Further, it may be a sintered product or a forged product.
[0049]
【The invention's effect】
As described above, in the present invention, a structure in which a pipe support plate for connecting a pipe is laminated to a valve seat plate on which a valve body slides is employed. Is simple and can be manufactured at low cost. For example, if the inlet and outlet formed in the valve seat plate are small-diameter straight holes and the pipe insertion hole formed in the pipe support plate is a large-diameter straight hole, it is stepped by simply laminating two plates. Can be formed. Therefore, the pipe can be fixed in a state where the tip of the pipe is in contact with the step portion of the hole, and a plate having such a straight hole can be manufactured by pressing. Further, in order to ensure airtightness at the outer peripheral edge of the joining surface of the two plates, the present invention uses a metal thin film formed by a method such as plating, sputtering, or thermal spraying in a state where the two plates are laminated. Do not use brazing to seal parts. For this reason, since it is not necessary to perform brazing over a wide range, the valve seat plate or the like is not distorted. Therefore, a high quality valve device can be manufactured at low cost.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a refrigerant distribution device for a refrigerator to which the present invention is applied.
2A to 2F are explanatory diagrams of each mode in the refrigerant distributor shown in FIG.
3 is a longitudinal sectional view and a bottom view of a flow path component of the valve device used in the refrigerant distributor shown in FIG. 1. FIG.
4A, 4B, and 4C are a plan view, a longitudinal sectional view, and a bottom view of a valve seat plate used in the flow path component shown in FIG. 3, respectively.
5A and 5B are a plan view and a longitudinal sectional view of a pipe support plate 14 used in the flow path constituting member shown in FIG. 3, respectively.
6 (A) and (B) are respectively a valve seat plate shown in FIGS. 4 (A), (B) and (C), and a pipe support plate shown in FIGS. 5 (A) and 5 (B). It is the top view of the state laminated | stacked, and a longitudinal cross-sectional view.
FIGS. 7A and 7B are plan views after nickel plating in a state where a valve seat plate and a pipe support plate are laminated as shown in FIGS. 6A and 6B, respectively. FIG.
FIGS. 8A and 8B are views showing a valve seat plate after nickel plating is applied to a laminate of a valve seat plate and a pipe support plate as shown in FIGS. 7A and 7B, respectively. It is the top view after grind | polishing the surface of 13 and a longitudinal cross-sectional view.
FIGS. 9A and 9B are respectively a rotor support shaft, a valve body support shaft, and an outflow formed by stacking a valve seat plate and a pipe support plate as shown in FIGS. 8A and 8B. It is the top view of the state fixed by brazing after temporarily fixing a pipe and an inflow pipe, and a longitudinal section.
FIGS. 10A and 10B are a longitudinal sectional view and a bottom view, respectively, of a flow path constituting member of a conventional valve device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Refrigerant distribution apparatus 1a Valve apparatus 5 Metal thin film 6 Brazing material 10 Stepping motor 11 Flow path component 13 Valve seat plate 13a, 13b Outlet 13c Inlet 13d, 13e, 14d, 14e Shaft hole 14 Pipe support plates 14a, 14b, 14c Pipe insertion hole 18 Rotor spindle (rotation center axis)
19 Sealing cases 28a, 28b Outflow pipe 28c Inflow pipe 30 Valve body 35 Valve body support shaft (rotation center axis)
111 steps

Claims (4)

A refrigerant inlet and a valve seat plate through which the refrigerant outlet penetrates in the thickness direction, and a surface portion of the valve seat plate so as to cover the front side and the back side of the valve seat plate. A valve device having a sealed case, and a valve body that slides on a surface of the valve seat plate to open and close the inlet or the outlet.
Pipe insertion holes that are respectively communicated with the inflow port and the outflow port are formed, and a pipe support plate that is stacked on the back side of the valve seat plate;
An end portion is fixed in the pipe insertion hole of the pipe support plate, and an inflow pipe and an outflow pipe communicated with the inflow port and the outflow port, respectively.
Each end of the inflow pipe and the outflow pipe is brazed in the pipe insertion hole,
The valve seat plate and the pipe support plate are laminated so that both end portions are displaced, and a step portion is formed on the outer peripheral edge of the joint surface,
The outer peripheral side of the joint surface between the valve seat plate and the pipe support plate is hermetically sealed with a metal thin film ,
The metal thin film is a plating film applied in a state where the valve seat plate and the pipe support plate are laminated, and is melted by heat at the time of brazing and concentrated by surface tension, so that the step portion The valve device is characterized in that the thickness of the portion formed in the film is thicker than the thickness of the portion formed in the other region.   2. The valve device according to claim 1, wherein each of the valve seat plate and the pipe support plate is a press-processed product. In Claim 1 or 2, a shaft hole into which a rotation center shaft of a gear for driving the valve body is inserted is formed in the valve seat plate and the pipe support plate,
The valve device , wherein the rotation center shaft is brazed in the shaft hole . 4. The valve device according to claim 1, wherein the metal thin film is a nickel plating film .

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