JPH1137306A - Flow control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the noise caused by the change of each section of the passage, when the fluid such as a refrigerant is passed through a valve element part. SOLUTION: A flow control valve 1 comprises a valve body 20 comprising a valve chest 21, and a valve shaft 30 movable in the axial direction in the valve chest 21, the valve body 20 comprises a fluid passage hole 23 with a valve seat, and a fluid in/outlet 22, and a sectional area of the fluid passage of the fluid in/outlet 22 is almost agreed with a sectional area of the fluid passage of a circular space between the valve chest 21 and a valve rod, and a sectional area of the fluid passage of the fluid passage hole 23 is almost 0.3 times of the sectional area of the fluid passage of the circular space between the valve chest 21 and the valve rod.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow control valve, and more particularly to a flow control valve which is incorporated as an expansion valve in a refrigeration cycle of a heat pump type air conditioner or the like, and is suitable for reducing noise during passage of a fluid (refrigerant). It relates to a flow control valve.

[0002]

2. Description of the Related Art As a flow control valve of this type, a main part of a flow control valve as partially shown in FIG. 5 has already been proposed. The illustrated flow control valve 1 ′ is used by being incorporated as an expansion valve in a refrigeration cycle of a heat pump type air conditioner, and basically includes a stepping motor (not shown), a valve body 20, and a valve shaft. The valve shaft 30 is moved up and down by screw feed by the stepping motor, and the valve shaft 30 opens and closes the fluid passage hole 23 formed in the valve body 20 (the opening area is changed). To control the flow rate.

Hereinafter, the main part of the flow control valve 1 'will be described in detail. The valve body 20 has a valve chamber 21 serving as a pressure reducing mechanism, and a conduit 64 is connected to the left side of the valve chamber 21. A fluid inlet / outlet 22 is provided, and a conduit 6 is provided on a bottom surface thereof.
5 and a valve seat 24 formed at the upper end of the fluid passage hole 23 opened and closed by the valve shaft 30.

The fluid passage hole 23 includes, in order from the top, a valve seat 24 forming a short inverted truncated cone-shaped conical receiving surface that expands upward, a cylindrical or conical intermediate portion 23b, and
A relatively long truncated conical rectifying conical port 2 that expands downward
3c.

The lower end of the valve shaft 30 for opening and closing the fluid passage hole 23 is seated on the valve seat 24 and the fluid passage hole 23 is closed.
A relatively short tapered inverted frustoconical conical seating surface part 3
0a and a relatively long tapered frusto-conical conical surface portion 30b connected to the intermediate portion 23b and the rectifying conical port 23c are formed below the lower portion 0a. On the other hand, the valve body 2
A guide bush 26 having a female screw portion 27 formed on the inner peripheral portion is fixed above the valve chamber 21 of the “0”.

A male screw portion 29 formed on the outer periphery of the valve shaft holder 28 is screwed into the female screw portion 27 of the guide bush 26, and the valve shaft 30 slides on the lower inner periphery of the valve shaft holder 28. A collar 34 is press-fitted and fixed to the lower part of the valve shaft holder 28 to receive the upper flange of the valve shaft 30, and the valve shaft 30 is shrunk in the valve shaft holder 28. The coil spring 32 is constantly urged downward.

An elevating shaft (not shown) is fixedly fitted on the upper portion of the valve shaft holder 28 so as to be rotatable integrally therewith. A synthetic resin sleeve 40 having a movable stopper 45 protruding downward is formed so as to be integrally rotatable.

On the outer periphery of the upper part of the guide bush 26, a fixed receiving seat 50 made of synthetic resin is formed, in which a convex fixed side stopper 55 to which the movable side stopper 45 abuts is projected upward. ing.

In the flow control valve 1 'having such a structure, when the motor is rotated in one direction (forward rotation), the sleeve 40, the valve shaft holder 28 and the like rotate integrally, and the female screw portion 27 and the male screw portion are rotated. The valve shaft 30 is lowered by screw feed by screwing with the portion 29, and the conical seating surface portion 3
Oa is seated on the conical receiving surface portion 23a of the fluid passage hole 23 formed in the valve seat 24, and the fluid passage hole 23 is closed.

When the fluid passage hole 23 is closed, the movable stopper 45 has not yet come into contact with the fixed stopper 55, and the valve shaft 30 is connected to the fluid passage hole 23.
Is closed, the valve shaft holder 28 and the like are further rotated down. The amount of downward movement of the valve shaft holder 28 with respect to the valve shaft 30 at this time is absorbed by the compression of the coil spring 32.

Thereafter, when the valve shaft holder 28 and the like are further rotated down, the movable side stopper 45 abuts against the fixed side stopper 55, whereby the rotor 39 is rotated.
The sleeve 40,
The rotational lowering movement of the valve shaft holder 28 and the like is forcibly stopped. On the other hand, when the motor is rotated in the reverse direction, the conical seating surface 30a of the valve shaft 30 is
3a, the fluid passage hole 23 is opened.

When the flow control valve 1 'is incorporated as an expansion valve in a refrigeration cycle of an air conditioner, during the heating operation of the air conditioner, the valve shaft 30 is raised so that the fluid passage hole 23 is in a predetermined position. The valve is opened to the opening degree, and the refrigerant is introduced from the indoor heat exchanger (indoor condenser) into the valve chamber 21 via the conduit 64 as shown by the dashed arrow in the figure, and the valve chamber 2
1 through the fluid passage hole 23 to the conduit 65 side and through the conduit 65 to the outdoor heat exchanger.

During the cooling operation of the air conditioner, the valve shaft 30 is raised to open the fluid passage hole 23 to a predetermined opening degree, and the refrigerant flows as shown by a solid arrow in the drawing.
Contrary to the heating operation, the indoor heat exchanger is introduced from the outdoor heat exchanger through the conduit 65 and the fluid passage hole 23 into the valve chamber 21, where the pressure is expanded and decompressed, and then the indoor exchanger (indoor evaporator) from the valve chamber 21 via the conduit 64. It is led to.

[0014]

In the flow control valve 1 'as described above, high-frequency harsh noise may be generated when the refrigerant flows while the flow control valve 1' is open. It is a problem.

During the heating operation of the flow control valve 1 ', refrigerant flows in from the conduit 64 side, enters the valve chamber 21 from the fluid inlet / outlet 22, and passes from the valve chamber 21 through the fluid passage hole 23 to the conduit 65. Flow through the fluid passage hole 2
There is also a relationship that the rectifying conical port 23c is formed on the refrigerant outlet side of No. 3 and there is no such a significant noise, but during the cooling operation in which the refrigerant flows in the opposite direction to the heating operation, the above-mentioned condition is obtained. Such unpleasant noise may occur.

That is, according to the study by the inventors of the present application,
The generation of the noise is caused by a change in volume while the refrigerant passes through the flow control valve, that is, the conduit 6 through which the refrigerant passes.
5. It was confirmed that the turbulence of the flow generated due to the change in the cross-sectional area of each of the fluid passage hole 23, the valve chamber 21, the fluid inlet / outlet 22, and the conduit 64 was one of the causes of noise generation. Further, it has been clarified that the flow resistance in the volume change portion of the flow path of the refrigerant also contributes to the noise.

The present invention has been made in view of such a problem, and an object of the present invention is to reduce harsh noise caused by a change in each cross section of a fluid such as a refrigerant passing through a valve body. An object of the present invention is to provide a flow control valve that can be effectively reduced.

[0018]

In order to achieve the above object, a flow control valve according to the present invention is suitable as a refrigerant expansion valve for a refrigeration cycle of an air conditioner.
A valve body having a valve chamber and a valve shaft movable axially in the valve chamber; the valve body having a fluid passage hole with a valve seat and a fluid inlet / outlet; Area
The fluid flow cross section of the annular space between the valve chamber and the valve stem is substantially the same.

Further, in the flow control valve according to the present invention, the fluid flow cross-sectional area of the fluid passage hole may be approximately 0.3 times the fluid flow cross-sectional area of the annular space between the valve chamber and the valve rod. It is characterized by doing.

In a preferred specific embodiment of the flow control valve according to the present invention, the fluid passage hole has an R-shaped chamfered lower end opening, and the lower end of the valve body is provided with the fluid passage. It is characterized in that it is arranged in the hole of the hole. In the flow control valve of the present invention having such a configuration, during the cooling operation, the fluid such as the refrigerant that has flowed in from the outdoor unit via the conduit flows into the fluid passage hole having a small cross-sectional area whose flow passage is narrowed. Flows into the annular space of the valve chamber having an enlarged cross-sectional area from the fluid passage hole, and is further expanded through the fluid inlet and outlet having a cross-sectional area substantially equal to that of the annular space. It enters a conduit having a large cross-sectional area and is led to an indoor heat exchanger (indoor evaporator) via the conduit.

Further, in the flow control valve according to the present invention, the ratio of the cross-sectional area of the fluid passage hole to the cross-sectional area of the annular space of the valve chamber is set to approximately 0.3 times, and the cross-sectional area of the fluid inlet / outlet and the valve chamber are adjusted. Since the ratio with the cross-sectional area is substantially the same, the rate at which the refrigerant expanded from the fluid passage hole is diffused in the valve chamber is suppressed, and
Even when the fluid flows from the valve chamber to the fluid inlet / outlet, the volume does not substantially change, so that unnecessary movement of the refrigerant in the flow process is suppressed, and vortex generation due to turbulence and the like is suppressed. It is suppressed and pressure fluctuation due to peeling is less likely to occur, and as a result, high-frequency harsh noise is reduced.

Also, since the lower end of the fluid passage hole is chamfered in an R shape, the refrigerant flowing into the flow control valve from the conduit during the cooling operation is supplied to the lower end portion of the fluid passage hole and the valve body. At the tip of the nozzle, the flow is not disturbed, but flows in a laminar flow, so that eddies and turbulent flows which cause the noise are hardly generated.

Furthermore, since the distal end of the valve body is disposed so as to be located inside the hole of the fluid passage hole, after the refrigerant is guided into the fluid passage hole, the refrigerant is removed from the valve body. As a result, the vortex, turbulence, etc. of the refrigerant at the front end portion are reduced, as compared with a case in which the front end extends further below the lower end of the fluid passage hole and projects. Can be reduced.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the flow control valve of the present invention will be described below in detail with reference to the drawings. In describing the embodiment, components having the same functions as those of the conventional example will be denoted by the same reference numerals.

FIG. 1 shows an embodiment of a flow control valve 1 according to the present invention. The flow control valve 1 of the illustrated embodiment includes:
It is used by being incorporated as an expansion valve in a refrigeration cycle of a heat pump type air conditioner, and basically includes a stepping motor 10, a valve body 20, an elevating shaft 35 and a valve shaft 3
And the lift shaft 35 is rotated by the stepping motor 10 to be moved up and down by screw feed, and the valve shaft 20 is moved up and down with the valve shaft 20 to move up and down.
The flow rate is controlled by opening and closing (changing the opening area) the fluid passage hole (orifice) 23 formed in the hole.

More specifically, the stepping motor 10 includes a stator yoke 13 fitted on an outer peripheral portion of an inverted bottomed cylindrical can 11 connected to the valve body 20 via a lid 18. , A bobbin 14, a winding 15 wound around the bobbin 14 and energized from the outside, a motor mold 12 for casting the outer circumference of the stator yoke 13, the bobbin 14 and the winding 15, and an inside of the can 11. And a rotor 39 composed of a bonded magnet fixed to a sleeve 40 described later.

The motor mold 12, the stator yoke 13, the bobbin 14, and the winding 15 are integrally fitted around the outer periphery of the can 11, and they are pressed and fixed to the motor mold 12 by screws 16. By fitting the spherical crown-shaped locking projection 17a into one of four recesses 19 provided on the outer periphery of the can 11 at, for example, 90-degree intervals, positioning and retaining are performed.

The valve body 20 has a valve chamber 21 serving as a pressure reducing mechanism. A fluid inlet / outlet 22 to which a conduit 64 is connected is provided on the left side of the valve chamber 21, and a conduit 65 is provided on the bottom of the valve chamber 21. A valve seat 24 is formed in the fluid passage hole 23 that is connected and opened and closed by the valve shaft 30. on the other hand,
Above the valve chamber 21 of the valve body 20, a guide bush 26 having an internal thread 27 formed on the inner periphery is fixed.

A male screw portion 29 formed on the outer periphery of the valve shaft holder 28 is screwed into the female screw portion 27 of the guide bush 26, and the valve shaft 30 slides on the lower inner peripheral portion of the valve shaft holder 28. A collar 34 is press-fitted and fixed to the lower part of the valve shaft holder 28 to receive the upper flange of the valve shaft 30, and the valve shaft 30 is shrunk in the valve shaft holder 28. The coil spring 32 is constantly urged downward.

An elevating shaft 3 is provided above the valve shaft holder 28.
5 is fixed inside so as to be rotatable integrally therewith, and a synthetic resin sleeve 40 having a convex movable-side stopper 45 protruding downward is provided on the outer periphery of the upper part of the valve shaft holder 28. It is formed so as to be able to rotate integrally. A coil spring 3 is provided above the elevating shaft 35.
6 are loaded. When the rotor 39 is rotated (reversely rotated), the elevating shaft 35, the sleeve 40, and the like are raised by screwing the female screw portion 27 and the male screw portion 29 into the coil spring 36.
When the screws 7 and 29 are disengaged, the valve shaft holder 28 is pressed toward the guide bush 26 to facilitate re-engaging.

On the outer periphery of the upper part of the guide bush 26,
A fixed receiving seat 50 made of a synthetic resin and having a convex fixed-side stopper 55 to which the movable-side stopper 45 abuts is formed to project upward. As shown in detail in FIGS. 2 and 3, the fluid passage hole 23 has the same inner diameter, is provided with a valve seat 24 facing the upper valve chamber 21, and has a lower end around R. A chamfer 23a is provided.

The valve body 31 at the lower end of the valve shaft 30 for opening and closing the fluid passage hole 23 is a relatively short tapered inverted frustoconical cone seated on the valve seat 24 and closing the fluid passage hole 23. A seat surface 31a and a relatively long tapered frustoconical conical surface portion 31b connected to the lower side thereof are formed.

As shown in FIG. 3A, the diameter of the fluid inlet / outlet 22 formed in the valve body 20 is D ₁ , the diameter of the fluid passage hole 23 is D ₂ , and the valve chamber 21 has a diameter of D ₂ . Assuming that the diameter is D ₃ and the diameter of the valve stem 30 is D ₄ , as shown in FIG. 3B, the cross-sectional area A ₁ of the fluid inlet / outlet is:
^{_{A 1 = πD 1 2/4}} , the cross-sectional area A ₂ of the fluid passage hole 23, A ₂
= ΠD _{² 2/4,} the cross-sectional area of the annular space 21a of the valve chamber 21 minus the cross-sectional area of the valve stem 30 from the cross-sectional area of the valve chamber 21 A
₃ is a _{A 3 = π / 4 · (} D 3 2 -D 4 2).

The cross-sectional area of the conduit 64 is A ₄ , the cross-sectional area of the conduit 65 is A _5, and the cross-sectional areas A ₁ -A of the respective parts through which the fluid such as the refrigerant of the flow control valve 1 of the present embodiment passes. FIG. 4A conceptually shows the relative size ratio of ₅ . That is, the two conduits 64 and 65 have the largest sectional area, and the fluid passage hole 23 has the smallest sectional area. The sectional area A ₁ of the fluid outlet 30 and the sectional area A ₃ of the annular space 21 a of the valve chamber 21 are substantially equal (A ₁ ≒ A ₃ ), and the fluid passage hole 23
Approximately 30 percent of the cross-sectional area of the cross-sectional area A ₂ the annular space A ₃ (A ₂
≒ 0.3A ₃ ).

In the flow control valve 1 having such a configuration,
When the winding 15 is energized in one direction, the rotor 39,
The sleeve 40, the elevating shaft 35, the valve shaft holder 28, etc. rotate integrally (the motor 10 rotates clockwise forward) integrally,
The valve shaft 30 is lowered by screw feed by screwing the male thread portion 7 with the male thread portion 29, and the valve shaft 30 is pressed and seated on the valve seat 24 of the fluid passage hole 23, and the fluid passage hole 23 is closed.

When the fluid passage hole 23 is closed, the movable stopper 45 has not yet come into contact with the fixed stopper 55, and the valve shaft 30 is connected to the fluid passage hole 23.
Is closed, the valve shaft holder 28 and the like are further rotated down. The amount of downward movement of the valve shaft holder 28 with respect to the valve shaft 30 at this time is absorbed by the compression of the coil spring 32.

Thereafter, when the valve shaft holder 28 and the like are further rotated down, the movable side stopper 45 abuts against the fixed side stopper 55, whereby the rotor 39 is rotated.
The sleeve 40,
The rotational lowering movement of the elevating shaft 35, the valve shaft holder 28, and the like is forcibly stopped.

On the other hand, when the winding 15 is energized in the reverse direction, the motor 10 rotates in the reverse direction and the valve shaft 30
Is separated from the cone receiving surface portion 23a, and the fluid passage hole 23 is opened.

When the flow control valve 1 having the above-described structure is incorporated as an expansion valve in a refrigeration cycle of an air conditioner, when the air conditioner is in a heating operation, the valve shaft 30 is raised and the fluid passage is moved. The hole 23 is opened to a predetermined opening, and the refrigerant is introduced into the annular space 21a of the valve chamber 21 from the indoor heat exchanger (indoor condenser) via the conduit 64 and the fluid inlet / outlet 22, as indicated by the dashed arrow in the drawing. Then, it is led out from the valve chamber 21 through the fluid passage hole 23 to the conduit 65 side, and is guided to the outdoor heat exchanger via the conduit 65.

During the cooling operation of the air conditioner, the valve shaft 30 is raised to open the fluid passage hole 23 to a predetermined opening degree, and the refrigerant flows as shown by a solid arrow in the drawing.
Contrary to the heating operation, the air is introduced from the outdoor heat exchanger into the annular space 21a of the valve chamber 21 through the conduit 65 and the fluid passage hole 23, where the pressure is expanded and reduced. It is led to the indoor heat exchanger (indoor evaporator) via the conduit 64.

As shown in FIG. 4 (a), the flow control valve 1 of the present embodiment has a conduit 65 during the cooling operation.
Refrigerant flows from the fluid passage hole 23 having a small cross-sectional area by narrowing the flow passage thereof, and is expanded and decompressed into the annular space 21a of the valve chamber 21 having an enlarged cross-sectional area from the fluid passage hole 23, Through the fluid inlet / outlet 22 having a sectional area substantially equal to that of the annular space 21a, the fluid is guided to a conduit 64 having a larger sectional area than the fluid inlet / outlet 22.

The cross-sectional area of each part through which the refrigerant passes through the flow control valve 1 of the present embodiment can be understood by comparing with the cross-sectional area of the conventional flow control valve shown in FIG. As described above, the flow control valve 1 according to the present embodiment includes a fluid passage hole 2
3 the cross-sectional area A ₂ the ratio of the sectional area of the annular space 21a A ₃ of the valve chamber 21 as A ₂ ≒ 0.3 A _3, the cross-sectional area A ₂ of the fluid passage hole 23 of a conventional flow control valve wherein The flow rate control valve 1 of the present embodiment is smaller than the cross-sectional area A ₃ of the annular space 21 a of the valve chamber 21.
Cross sectional area A ₁ and the ratio of the cross-sectional area A ₃ of the annular space 21a of the valve chamber 21 as A ₁ ≒ A _3, a conventional annular space of the flow control valve is the fluid inlet and outlet 22 and the valve chamber 21 The area ratio is A ₁
<Thereby eliminating the diaphragm as compared to focused flow of the refrigerant from the valve chamber 21 as A ₃ to the fluid inlet and outlet 22.

Therefore, the flow control valve 1 of the present embodiment is
Compared with the conventional flow control valve, the refrigerant after expansion is suppressed from being decompressed and diffused in the valve chamber 21 and the volume of the refrigerant is hardly changed even when flowing from the valve chamber 21 to the fluid inlet / outlet 22. Therefore, unnecessary movement of the refrigerant such as turbulence in the flow process is suppressed, and the suppression action suppresses the generation of vortices due to turbulence and the like, so that pressure fluctuation due to separation is less likely to occur, As a result, high-frequency harsh noise is reduced.

Further, in the flow control valve 1 of the present embodiment, since the lower end 23a of the fluid passage hole 23 is chamfered in an R shape, the refrigerant flowing into the flow control valve 1 from the conduit 65 during the cooling operation. Is flowed in a laminar manner without disturbing the flow of the lower end portion 23a of the fluid passage hole 23, so that eddies and turbulent flows which cause the noise are hardly generated. .

Further, since the distal end 31c of the valve element 31 is disposed so as to be located inside the fluid passage hole 23, after the coolant is introduced into the fluid passage hole 23, the coolant is discharged from the fluid passage hole 23. It comes into contact with the tip 31c of the valve body 31,
The distal end 31c extends further below the lower end of the fluid passage hole 23 and is protruded, as compared with the distal end 31c.
The generation of vortex, turbulence and the like of the refrigerant in the portion 1c can be reduced.

In the above embodiment, the flow control valve 1
Was described as an expansion valve incorporated in a refrigeration cycle of an air conditioner.However, the flow control valve of the present invention is not only used as an expansion valve but also reduces noise when used as another valve. Can be planned.

In the above embodiment, the valve shaft is moved up and down by screw feed by a motor. However, the present invention is not limited to this. The valve shaft is moved in the axial direction to open and close the fluid passage hole. If you choose to do
Similar effects can be obtained.

Further, in the above embodiment, in order to reduce the volume of the valve chamber 21 as compared with the conventional flow control valve,
This is addressed by increasing the wall thickness of the valve body 20,
It can also be dealt with by inserting and disposing a separate collar-shaped valve chamber volume adjuster in the valve chamber of the conventional flow control valve.

[0049]

As will be understood from the above description, the flow control valve of the present invention has a reduced cross-sectional area change in the course of the flow of the refrigerant, so that the vortex is generated due to the turbulent flow of the fluid such as the refrigerant. , And pressure fluctuations due to the separation of the refrigerant are less likely to occur, and high-frequency harsh noise generated during cooling can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a flow control valve according to the present invention.

FIG. 2 is an enlarged sectional view of a valve body and a valve shaft of the flow control valve shown in FIG. 1;

FIG. 3 is a perspective conceptual view of a valve body and a valve shaft of the flow control valve shown in FIG. 2;

FIG. 4 is a conceptual diagram of a cross-sectional area of a fluid flow portion of a valve body of the flow control valve, where (a) is a conceptual diagram of a cross-sectional area of the flow control valve of the present embodiment, and FIG. FIG. 1 is a conceptual diagram of a cross-sectional area of a conventional flow control valve.

FIG. 5 is an enlarged sectional view of a valve body and a valve shaft of a conventional flow control valve.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Flow control valve, 10 ... Stepping motor, 20 ... Valve body, 21 ... Valve chamber, 21a ... Annular space, 22 ... Fluid inlet / outlet, 23 ... Fluid passage hole, 24 ... Valve seat, 30 ... Valve shaft, 31
... Valve element 31c ... Valve element tip, 64 ... Conduit, 65 ... Conduit

Claims (6)

[Claims] 1. A flow control valve comprising: a valve body having a valve chamber; and a valve shaft movable axially in the valve chamber, wherein the valve body has a fluid passage hole with a valve seat and a fluid inlet / outlet. The flow control valve according to claim 1, wherein a fluid flow cross-sectional area of the fluid inlet / outlet is substantially equal to a fluid flow cross-sectional area of an annular space between the valve chamber and the valve rod. 2. A flow control valve comprising: a valve body having a valve chamber; and a valve shaft movable axially in the valve chamber, wherein the valve body has a fluid passage hole with a valve seat and a fluid inlet / outlet. The flow control valve according to claim 1, wherein a fluid flow cross-sectional area of the fluid passage hole is approximately 0.3 times a fluid flow cross-sectional area of an annular space between the valve chamber and the valve rod. 3. The flow rate according to claim 2, wherein a fluid flow cross-sectional area of the fluid inlet / outlet is substantially equal to a fluid flow cross-sectional area of an annular space between the valve chamber and the valve stem. Control valve. 4. The fluid passage hole has an opening at the lower end of the fluid passage hole.
The flow control valve according to any one of claims 1 to 3, wherein the flow control valve is chamfered in a shape. 5. The flow control valve according to claim 1, wherein a lower end of the valve body is disposed in a hole of the fluid passage hole. 6. A refrigerant cycle expansion valve incorporated in a refrigeration cycle of an air conditioner.
The flow control valve according to any one of the above.