JP2020143767A - Flow rate regulating valve and method for assembling the same - Google Patents

Abstract

To provide a flow rate regulating valve that can effectively reduce flowing sound while suppressing increase in manufacturing cost, and to provide a method for assembling the flow rate regulating valve.SOLUTION: A flow rate regulating valve 1 includes: a cylindrical part 16 provided to a seat member 11 and inserted on a side of an upper end 19b of a pipe 19; a straightening member 20 held between a projection 19a provided to the pipe 19 so as to project inward in a radial direction and a tip 16a of the cylindrical part 16; and a clearance S opening in an axis L direction between the upper end 19b of the pipe 19 and the seat member 11.SELECTED DRAWING: Figure 1

Description

The present invention relates to, for example, a method for assembling a flow rate adjusting valve and a flow rate adjusting valve used for adjusting the flow rate of a refrigerant in a heat pump type heating / cooling system or the like.

A conventional flow rate regulating valve is disclosed in Patent Document 1. As shown in FIG. 2, the flow rate adjusting valve 901 of Patent Document 1 includes a main body 911 provided with a valve chamber 914 and an orifice 931 and a valve body 940 arranged in the valve chamber 914 facing the orifice 931. , And a bottomed tubular rectifying member 920. The rectifying member 920 integrally has a tubular portion 921 and a flat plate-shaped rectifying portion 922 provided so as to close the lower end of the tubular portion 921. The tubular portion 921 is arranged so as to be connected to the orifice 931 and constitutes a valve port 930 which is a fluid flow path through which the refrigerant flows together with the orifice 931. The rectifying unit 922 is provided with a plurality of small holes 924. By passing the refrigerant through the plurality of small holes 924, the bubbles in the refrigerant in the two-phase flow state including the liquid phase and the gas phase can be subdivided, and the flow noise accompanying the flow of the refrigerant can be reduced.

JP-A-2007-107623

The flow control valve 901 has a pipe 919 connected to the valve port 930. The pipe 919 is provided with a protrusion 919a that protrudes inward in the radial direction. The rectifying member 920 is sandwiched between the main body 911 and the protrusion 919a of the pipe 919. The pipe 919 is fixed to the main body 911 with the upper end 919b abutted against the main body 911. Then, in order to prevent the rectifying member 920 from rattling, the length from the protrusion 919a to the upper end 919b of the pipe 919 must be appropriately matched with the length of the rectifying member 920 in the axis L direction. Therefore, high-precision processing is required, which has led to an increase in manufacturing cost.

Therefore, an object of the present invention is to provide a flow rate adjusting valve and a method for assembling a flow rate adjusting valve that can effectively reduce flow noise while suppressing an increase in manufacturing cost.

In order to achieve the above object, the flow rate adjusting valve according to the present invention has a flow rate having a valve body provided with a valve chamber, a valve body arranged in the valve chamber, and a pipe attached to the valve body. The valve body is a regulating valve, and the valve body is formed in the shape of a disk having a hole and a body member provided with a cylindrical portion forming a valve opening leading to the valve chamber, so as to close the tip of the cylindrical portion. The rectifying member has an arranged rectifying member, the pipe has a protrusion provided so as to protrude inward in the radial direction, the cylindrical portion is inserted into the pipe, and the rectifying member has a protrusion. It is sandwiched between the protrusion and the tip of the cylindrical portion, and is characterized in that a gap is provided between one end of the pipe and the main body member in the insertion direction.

According to the present invention, a cylindrical portion provided on the main body member is inserted into the pipe. The rectifying member is sandwiched between a protrusion provided on the pipe so as to project inward in the radial direction and the tip of the cylindrical portion. A gap is provided between one end of the pipe and the main body member in the insertion direction. Since this is done, it is possible to prevent one end of the pipe from hitting the main body member. Therefore, even if the dimensions of the main body member and the pipe vary slightly, the rectifying member can be securely fixed without rattling.

In the present invention, it is preferable that the length from the protrusion to one end of the pipe is shorter than the axial length of the cylindrical portion. By doing so, it is possible to more reliably prevent one end of the pipe from hitting the main body member.

In the present invention, it is preferable that the main body member is provided with an annular groove having an outer peripheral surface of the cylindrical portion as an inner peripheral surface, and the pipe is press-fitted into the annular groove. By doing so, since the pipe is held in the annular groove by press fitting, it is not necessary to support the pipe when attaching the pipe to the valve body by brazing or the like. Therefore, the assembling property can be improved.

In the present invention, the protrusion is formed in an annular shape, an annular curved surface or an annular inclined surface is formed on the peripheral edge of the rectifying member, and the protrusion is in contact with the peripheral edge. Is preferable. By doing so, the rectifying member is automatically aligned and the pipe and the rectifying member can be easily arranged coaxially.

In the present invention, it is preferable that a plurality of the holes are provided, and some of the holes are arranged so as to straddle the inner peripheral surface of the cylindrical portion. By doing so, the aperture ratio of the rectifying member can be effectively increased.

In the present invention, it is preferable that a plurality of the partial holes are provided, and two of the plurality of the partial holes are arranged so as to face each other with the center of the rectifying member interposed therebetween. By doing so, it is possible to prevent the aperture ratio of the rectifying member from decreasing even when the rectifying member is arranged so as to be offset in the opposite direction of the two holes.

In order to achieve the above object, the method of assembling the flow control valve according to the present invention includes a valve body provided with a valve chamber, a valve body arranged in the valve chamber, a pipe attached to the valve body, and the like. The valve body is formed in a disk shape having a hole and a body member provided with a cylindrical portion forming a valve opening leading to the valve chamber, and is arranged so as to close the tip of the cylindrical portion. A method of assembling a flow control valve having a rectifying member and a protrusion, which protrudes inward in the radial direction at a position where the length of the pipe to one end of the pipe is shorter than the axial length of the cylindrical portion. A portion is provided, the rectifying member is arranged so as to close the tip of the cylindrical portion, the cylindrical portion is inserted into one end side of the pipe, and the rectifying member is placed between the protrusion and the tip of the cylindrical portion. It is characterized in that the pipe is attached to the main body member by sandwiching the pipe.

According to the present invention, a protrusion protruding inward in the radial direction is provided at a position where the length of the pipe to one end of the pipe is shorter than the axial length of the cylindrical portion. The rectifying member is arranged so as to close the tip of the cylindrical portion, and the cylindrical portion is inserted into one end side of the pipe so that the rectifying member is sandwiched between the protrusion and the tip of the cylindrical portion. Then, the pipe is attached to the main body member. From this, it is possible to provide a gap in the insertion direction between one end of the pipe and the main body member in a state where the rectifying member is sandwiched between the protrusion of the pipe and the tip of the cylindrical portion. As a result, it is possible to prevent one end of the pipe from hitting the main body member. Therefore, even if the dimensions of the main body member and the pipe vary slightly, the rectifying member can be securely fixed without rattling.

According to the present invention, the flow noise can be effectively reduced while suppressing an increase in manufacturing cost.

It is sectional drawing which shows the structure of the flow rate control valve which concerns on one Example of this invention. It is a figure which shows the conventional flow rate control valve.

Hereinafter, the flow rate adjusting valve according to an embodiment of the present invention will be described with reference to FIG.

FIG. 1 is a cross-sectional view showing a configuration of a flow rate adjusting valve according to an embodiment of the present invention. FIG. 1A is a vertical cross-sectional view (valve open state) along the axis L. FIG. 1B is a bottom view of the rectifying member (viewed from below in FIG. 1A). FIG. 1C is a bottom view showing a configuration of a modified example of the rectifying member of FIG. 1B.

The flow rate adjusting valve 1 of this embodiment is an electric valve used for adjusting the flow rate of the refrigerant as a fluid in, for example, a heat pump type heating / cooling system.

As shown in FIG. 1, the flow rate adjusting valve 1 has a valve body 10 and a valve body 40.

The valve main body 10 has a seat member 11 as a main body member, a case member 18, a pipe 19 as a pipe joint, and a rectifying member 20.

The sheet member 11 is manufactured by cutting a metal material such as stainless steel, for example. The seat member 11 integrally has a bottom wall portion 12 and a peripheral wall portion 13. The bottom wall portion 12 is formed in a disk shape. The peripheral wall portion 13 is formed in a cylindrical shape. The peripheral wall portion 13 extends upward from the upper surface 12a of the bottom wall portion 12. The peripheral wall portion 13 is inserted into the lower end portion of the cylindrical case member 18. The peripheral wall portion 13 and the case member 18 are fixed by brazing. The valve chamber 14 is formed by the upper surface 12a of the bottom wall portion 12, the peripheral wall portion 13, and the case member 18. That is, the upper surface 12a of the bottom wall portion 12 is the surface on the valve chamber 14 side, and the lower surface 12b of the bottom wall portion 12 is the surface on the opposite side to the valve chamber 14. A pipe (not shown) that penetrates laterally and is connected to the valve chamber 14 is fixed to the case member 18. In this embodiment, the seat member 11 and the case member 18 are separate members, and these are assembled and fixed to each other. However, the seat member 11 and the case member 18 are integrally manufactured as a main body member. You may.

An annular groove 15 is provided on the lower surface 12b of the bottom wall portion 12. The outer diameter of the annular groove 15 is slightly smaller than the outer diameter of the pipe 19. The upper end of the pipe 19 is press-fitted into the annular groove 15. The bottom wall portion 12 and the pipe 19 are fixed by brazing. Inside the annular groove 15 in the bottom wall portion 12, a cylindrical portion 16 extending downward so as to be separated from the valve chamber 14 is provided. The cylindrical portion 16 partially constitutes a valve port 30 which will be described later and leads to the valve chamber 14. The inner peripheral surface of the annular groove 15 is the outer peripheral surface of the cylindrical portion 16. The axis of the cylindrical portion 16 coincides with the axis L of FIG. That is, the axis L direction is the axial direction of the cylindrical portion 16. The cylindrical portion 16 is inserted into the upper end 19b side of the pipe 19 along the axis L direction (insertion direction) as the pipe 19 is press-fitted into the annular groove 15. The tip 16a of the cylindrical portion 16 is an annular plane facing downward. A valve seat 17 surrounding a valve opening 30, which will be described later, is provided on the upper surface 12a of the bottom wall portion 12. The valve seat 17 is an annular tapered surface that faces inward in the radial direction and whose diameter decreases as the distance from the valve chamber 14 increases. A valve body 40, which will be described later, is attached to and detached from the valve seat 17.

The rectifying member 20 is formed in a disk shape having the same diameter as the cylindrical portion 16. The rectifying member 20 is arranged so as to overlap the tip 16a so as to close the opening of the tip 16a of the cylindrical portion 16. The rectifying member 20 is sandwiched between the tip 16a of the cylindrical portion 16 and the annular protrusion 19a provided on the inner peripheral surface of the pipe 19 so as to project inward in the radial direction. In a state where the rectifying member 20 is sandwiched between the tip 16a of the cylindrical portion 16 and the protrusion 19a of the pipe 19, the upper end 19b at one end of the pipe 19 and the bottom wall portion 12 (specifically, the bottom surface of the annular groove 15). A gap S is provided between the 15a) and the axis L in the insertion direction. The length A from the protrusion 19a to the upper end 19b of the pipe 19 is shorter than the length B of the cylindrical portion 16 in the axis L direction. By doing so, it is possible to prevent the upper end 19b of the pipe 19 from hitting the bottom wall portion 12 in the above state. Therefore, even if the dimensions of the seat member 11 and the pipe 19 vary slightly, the rectifying member 20 can be securely fixed without rattling. The pipe 19 houses the cylindrical portion 16 and the rectifying member 20 inside. The cylindrical portion 16, the rectifying member 20, and the pipe 19 are arranged coaxially.

The rectifying member 20 is provided with a plurality of small holes 24. By passing the refrigerant through the plurality of small holes 24, bubbles in the refrigerant in the two-phase flow state including the liquid phase and the gas phase can be subdivided and the flow noise can be reduced.

As shown in FIGS. 1A and 1B, a part of the inner surface of the small hole 24 (24a) arranged at the outermost radial direction among the plurality of small holes 24 is inside the cylindrical portion 16. It is desirable that the surface is arranged so as to be continuous (equal to) the peripheral surface (third peripheral surface 35 described later) without a step. By doing so, it is possible to reduce the turbulence of the flow of the refrigerant when passing through the small holes 24.

Further, as shown in FIG. 1 (c), some of the small holes 24 (24b) among the plurality of small holes 24 are straddled by the inner peripheral surface of the cylindrical portion 16 (the third peripheral surface 35 described later). It may be placed in. For example, in the conventional bottomed tubular rectifying member 920 shown in FIG. 2, a small hole 924 could not be provided near the peripheral edge because it overlaps the tubular portion 921, but the rectifying member 20 is plate-shaped. Therefore, the small hole 24 can be provided near the peripheral edge portion as well. Therefore, the small holes 24 (24b) can be arranged so as to straddle the inner peripheral surface of the cylindrical portion 16 to effectively increase the aperture ratio. In this embodiment, two small holes 24b are arranged as a set, and these small holes 24b are arranged so as to face each other with the center O of the rectifying member 20 interposed therebetween. In the example of FIG. 1 (c), four sets are provided. By doing so, it is possible to prevent the aperture ratio from decreasing even when the rectifying member 20 is arranged so as to be offset in the opposite direction of the two small holes 24b.

In this embodiment, the peripheral edge portion 25 of the downwardly facing surface of the rectifying member 20 is formed with an annular curved surface having an arcuate radial cross section over the entire circumference. For example, when the rectifying member 20 is manufactured by punching a sheet metal with a punch, an annular curved surface is formed on the peripheral edge portion 25 of the surface of the rectifying member 20 on the punch side. An annular curved surface (R chamfer) may be formed by chamfering. The rectifying member 20 is arranged so that the surface on the punch side faces downward. An annular inclined surface may be formed on the peripheral edge portion 25 instead of the annular curved surface.

The protrusion 19a of the pipe 19 is formed by reducing the diameter over the entire circumference by a roll caulking machine. The cross section of the protrusion 19a in the axis L direction is arcuate. Therefore, when the protrusion 19a of the pipe 19 comes into contact with the peripheral edge 25 of the rectifying member 20, the rectifying member 20 is automatically aligned on the tip 16a of the cylindrical portion 16 which is an annular plane, and the pipe 19 and the rectifying member are automatically aligned. 20 and 20 are arranged coaxially. A plurality of protrusions 19a may be provided at intervals in the circumferential direction by using a punch.

The valve body 10 is formed with a valve port 30 as a fluid flow path from the inside of the valve seat 17 through the cylindrical portion 16 to the rectifying member 20.

The valve port 30 is provided on the seat member 11 coaxially with the cylindrical portion 16. The valve port 30 has a first peripheral surface 31, a first tapered surface 32, a second peripheral surface 33, a second tapered surface 34, and a third peripheral surface 35, which are connected in order from the valve chamber 14 side. doing.

The first peripheral surface 31, the second peripheral surface 33, and the third peripheral surface 35 are cylindrical peripheral surfaces facing inward in the radial direction. If the diameter (inner diameter) of the first peripheral surface 31 is D1, the diameter (inner diameter) of the second peripheral surface 33 is D2, and the diameter (inner diameter) of the third peripheral surface 35 is D3, then D1 <D2 <D3. .. The first tapered surface 32 and the second tapered surface 34 are annular tapered surfaces that face inward in the radial direction and increase in diameter as the distance from the valve chamber 14 increases. That is, the valve port 30 is formed so that the diameter gradually increases as the distance from the valve chamber 14 increases. Further, the valve port 30 has a cylindrical peripheral surface and a tapered surface whose diameter gradually increases as the distance from the valve chamber increases, and the peripheral surface and the tapered surface are alternately connected to each other. In this embodiment, the taper angle (angle θ1) of the first tapered surface 32 and the taper angle (angle θ2) of the second tapered surface 34 are the same (θ1 = θ2). The angle θ1 and the angle θ2 are arbitrary as long as they do not contradict the object of the present invention.

The valve body 40 is formed in a columnar shape as a whole. The valve body 40 integrally includes a body portion 41, a seating surface portion 42, and a curved surface portion 43. The body portion 41 is formed in a columnar shape. The seating surface portion 42 is connected to the lower end of the body portion 41. The outer peripheral surface of the seating surface portion 42 is an annular tapered surface that faces outward in the radial direction and whose diameter decreases from the upper side to the lower side. The curved surface portion 43 is connected to the lower end of the seating surface portion 42. The curved surface portion 43 has a shape for obtaining a characteristic similar to the equal percent characteristic as the flow rate characteristic. In this embodiment, the control angle (intersection angle between the central axis (axis L) of the valve body 40 and the line parallel to the axis L) of the curved surface portion 43 is gradually increased as it approaches the tip so as to imitate an elliptical spherical surface. It has a plurality of stages (here, 5 stages) of conical tapered surface portions 43A to 43E. The first control angle θa of the uppermost conical tapered surface portion 43A is usually set to 3 ° <θa <15 ° (here, 5 °). The lowermost conical tapered surface portion 43E has a pointed conical surface.

The valve body 40 is arranged in the valve chamber 14 so that the curved surface portion 43 faces the valve port 30 and the axis of the valve body 40 coincides with the axis L. The valve body 40 is brought into contact with and detached from the valve seat 17 by, for example, a screw feed type elevating drive mechanism (not shown) composed of a valve shaft provided with a male screw, a guide stem provided with a female screw, and a stepping motor. It is moved up and down so that it does. When the valve body 40 is seated, the seating surface portion 42 comes into contact with the valve seat 17 and closes the valve opening 30. The valve body 40 changes the flow rate of the refrigerant flowing through the valve port 30 according to the distance (lift amount) from the valve seat 17.

Next, the method of assembling the flow rate adjusting valve 1 described above will be described.

By punching the sheet metal with a punch, a disk-shaped rectifying member 20 having the same diameter as the cylindrical portion 16 and having a plurality of small holes 24 is produced.

A straight copper pipe material is cut to an appropriate length and processed by a roll caulking machine to produce a pipe 19 provided with an annular protrusion 19a protruding inward in the radial direction. Specifically, a protrusion 19a protruding inward in the radial direction is provided at a position in the pipe 19 where the length to the upper end 19b is shorter than the length of the cylindrical portion 16 in the axis L direction.

Then, the rectifying member 20 is arranged so as to overlap the tip 16a of the cylindrical portion 16. At this time, the surface of the rectifying member 20 opposite to the punch side is arranged so as to be in contact with the tip 16a of the cylindrical portion 16. A pipe 19 is inserted into the annular groove 15 from its upper end 19b along the axis L direction, and at the same time, a cylindrical portion 16 is inserted on the upper end 19b side of the pipe 19 and pushed in until the protrusion 19a abuts on the rectifying member 20 ( Press-fit). As a result, the rectifying member 20 is sandwiched and fixed between the protrusion 19a and the tip 16a of the cylindrical portion 16. At this time, the protrusion 19a comes into contact with the peripheral edge 25 of the rectifying member 20 so that the rectifying member 20 is aligned with the pipe 19. Further, a gap S is provided between the upper end 19b of the pipe 19 and the seat member 11 in the axis L direction (insertion direction). The peripheral wall portion 13 of the seat member 11 is inserted into the lower end portion of the case member 18. Then, brazing materials are installed at the brazing points of the seat member 11 and the pipe 19 and the seat member 11 and the case member 18 and put into the furnace. As a result, the seat member 11, the pipe 19, and the case member 18 are fixed, and the pipe 19 and the case member 18 are attached to the valve body 10.

Next, after attaching the valve body 40 to a screw feed type lift drive mechanism (not shown), the screw feed type lift drive mechanism is assembled to the case member 18 to which the pipe 19 and the seat member 11 are brazed. In this way, the flow rate adjusting valve 1 is completed.

From the above, according to the flow rate adjusting valve 1 of the present embodiment, the cylindrical portion 16 provided on the seat member 11 is inserted into the upper end 19b side of the pipe 19. The rectifying member 20 is sandwiched between a protrusion 19a provided on the pipe 19 so as to project inward in the radial direction and the tip 16a of the cylindrical portion 16. A gap S is provided between the upper end 19b of the pipe 19 and the seat member 11 in the axis L direction (insertion direction). Since this is done, it is possible to prevent the upper end 19b of the pipe 19 from hitting the seat member 11. Therefore, even if the dimensions of the seat member 11 and the pipe 19 vary slightly, the rectifying member 20 can be securely fixed without rattling.

Further, the length A from the protrusion 19a to the upper end 19b of the pipe 19 is shorter than the length B of the cylindrical portion 16 in the axis L direction. By doing so, it is possible to more reliably prevent the upper end 19b of the pipe 19 from hitting the seat member 11.

Further, the sheet member 11 is provided with an annular groove 15 having an outer peripheral surface of the cylindrical portion 16 as an inner peripheral surface. Then, the pipe 19 is press-fitted into the annular groove 15. By doing so, since the pipe 19 is held in the annular groove 15 by press fitting, it is not necessary to support the pipe 19 when the pipe 19 is attached to the seat member 11 by brazing. Therefore, the assembling property can be improved.

Further, the protrusion 19a of the pipe 19 is formed in an annular shape. An annular curved surface is formed on the peripheral edge portion 25 of the rectifying member 20. Then, the annular protrusion 19a is in contact with the peripheral edge 25. By doing so, the rectifying member 20 is automatically aligned, and the pipe 19 and the rectifying member 20 can be easily arranged coaxially.

In the flow rate adjusting valve 1 of the above-described embodiment, the rectifying member 20 is fixed by being sandwiched between the cylindrical portion 16 and the protrusion 19a of the pipe 19, but for example, the rectifying member 20 is fixed by projection welding or the like. It may be fixed to the tip 16a of the cylindrical portion 16.

Although examples of the present invention have been described above, the present invention is not limited to these examples. As long as the gist of the present invention is not contrary to the above-described embodiment, those skilled in the art appropriately adding, deleting, or changing the design, or combining the features of the examples as appropriate are also present inventions. Is included in the range of.

1 ... Flow control valve, 10 ... Valve body, 11 ... Seat member, 12 ... Bottom wall part, 13 ... Peripheral wall part, 14 ... Valve chamber, 15 ... Circular groove, 16 ... Cylindrical part, 16a ... Tip, 17 ... Valve seat , 18 ... Case member, 19 ... Pipe, 19a ... Protrusion, 19b ... Upper end, 20 ... Rectifying member, 24, 24a, 24b ... Small hole, 30 ... Valve port, 31 ... First peripheral surface, 32 ... First taper Surface, 33 ... 2nd peripheral surface, 34 ... 2nd tapered surface, 35 ... 3rd peripheral surface, 40 ... valve body, 41 ... body, 42 ... seating surface, 43 ... curved surface, 43A to 43E ... conical tapered surface , S ... Gap, A ... Length from the protrusion to the upper end of the pipe, B ... Axial length of the cylindrical part

Claims (7)

A flow rate adjusting valve having a valve body provided with a valve chamber, a valve body arranged in the valve chamber, and a pipe attached to the valve body.
The valve body includes a main body member provided with a cylindrical portion forming a valve opening leading to the valve chamber, and a rectifying member formed in a disk shape having a hole and arranged so as to close the tip of the cylindrical portion. Have,
The pipe has a protrusion provided so as to protrude inward in the radial direction.
The cylindrical portion is inserted into the pipe,
The rectifying member is sandwiched between the protrusion and the tip of the cylinder.
A flow rate adjusting valve characterized in that a gap is provided between one end of the pipe and the main body member in the insertion direction. The flow rate adjusting valve according to claim 1, wherein the length from the protrusion to one end of the pipe is shorter than the axial length of the cylindrical portion. The main body member is provided with an annular groove having an outer peripheral surface of the cylindrical portion as an inner peripheral surface.
The flow rate adjusting valve according to claim 1 or 2, wherein the pipe is press-fitted into the annular groove. The protrusion is formed in an annular shape.
An annular curved surface or an annular inclined surface is formed on the peripheral edge of the rectifying member.
The flow rate adjusting valve according to any one of claims 1 to 3, wherein the protrusion is in contact with the peripheral edge portion. A plurality of the holes are provided,
The flow rate adjusting valve according to any one of claims 1 to 4, wherein a part of the holes is arranged so as to straddle the inner peripheral surface of the cylindrical portion. A plurality of the partial holes are provided,
The flow rate adjusting valve according to claim 5, wherein two of the plurality of holes are arranged so as to face each other with the center of the rectifying member interposed therebetween. A cylinder having a valve body provided with a valve chamber, a valve body arranged in the valve chamber, and a pipe attached to the valve body, and the valve body constitutes a valve opening leading to the valve chamber. A method of assembling a flow rate adjusting valve having a main body member provided with a portion and a rectifying member formed in a disk shape having a hole and arranged so as to close the tip of the cylindrical portion.
A protrusion protruding inward in the radial direction is provided at a position where the length of the pipe to one end of the pipe is shorter than the axial length of the cylindrical portion.
The rectifying member is arranged so as to close the tip of the cylindrical portion, the cylindrical portion is inserted into one end side of the pipe, and the rectifying member is sandwiched between the protrusion and the tip of the cylindrical portion.
A method for assembling a flow rate adjusting valve, which comprises attaching the pipe to the main body member.

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