JP2003269504A - Valve device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a compression coil spring from dropping off from a valve element even if the valve element generates chattering. <P>SOLUTION: A reverse tapered shaft-like part 30 thickened toward the end is formed at a spring connection portion 29 of the valve element 18. A winding end portion 28C of an inside diameter Da smaller than the outside diameter Dc of the thickest portion of the reverse tapered shaft-like part 30 is fitted in a free condition of the compression coil spring 28 onto the taper outer periphery of the reverse tapered shaft-like part 29, and by this fitting, the compression coil spring 28 is connected to the valve element 18 so as not to come out. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve device,
In particular, it relates to a valve device including a compression coil spring as a valve spring.

[0002]

2. Description of the Related Art Many valve devices are provided with a valve body movably in a valve housing, and a compression coil spring for urging the valve body between the valve housing and the valve body in a valve opening direction or a valve closing direction. Is provided.

For example, in the pilot type solenoid valve disclosed in Japanese Patent Laid-Open No. 11-344145, as shown in FIG. 6, the pilot passage 103 is driven by the pilot valve 102 which is opened and closed by the electromagnetic coil device 101.
The valve body 104 is opened and closed by controlling the fluid pressure on the back side of the valve body (main valve body) 104, so that the valve body 104 is opened and closed by the pressure difference acting on both sides of the valve body 104, and the valve body 104 moves to the valve housing 105. The compression coil spring 107 that compressively deforms and biases the valve element 104 in the valve opening direction when it is in the fully closed position in which the valve seat portion 106 on the side is seated is provided with the valve housing 105 and the valve element 1.
It is installed between 04 and.

In the above pilot type solenoid valve, the compression coil spring 107 causes the valve element 104 and the valve housing 10 to be fully opened.
As shown in FIG. 7, one straight cylindrical winding end portion 107A of the compression coil spring 107 is attached to the outer periphery of the straight cylindrical connecting portion 104A of the valve body 104 so as not to move rattlingly with the No. It is fitted and one winding end 107A of the compression coil spring 107 is fixedly connected to the valve body 104 by an interference fit.

This interference fit is achieved by connecting portion 1 of valve body 104.
This is established by making the outer diameter of 04A slightly larger than the outer diameter of the winding end portion 107A of the compression coil spring 107 in the free state.

[0006]

In the conventional valve device represented by the pilot type solenoid valve as described above, the fixed connection of the compression coil spring to the valve body is such that the coil spring winding end portion having a straight cylindrical shape and the valve body side. Since it is performed by a simple interference fit with the straight cylindrical spring connection part, when the tensile force acts on the compression coil spring, the coil spring winding end part of the compression coil spring comes off from the spring connection part of the valve body. easy.

That is, when the outlet side in the valve housing temporarily becomes a higher pressure than the inlet side, the valve body causes chattering, and the impact causes the compression coil spring fixedly connected by the interference fit to the valve body. There is a risk of falling off more.

Further, the above-mentioned Japanese Patent Laid-Open No. 11-344145.
In addition to the pilot type solenoid valve shown in Japanese Patent Publication, a pilot type solenoid valve in which the inlet side port is arranged laterally of the pilot valve and the outlet side port extends straight below the pilot valve. Since there is not a sufficient valve chamber space around the valve seat, a straight columnar compression coil spring is interposed between the valve seat and the valve body. In the conventional valve device represented by this type of pilot solenoid valve, the compression coil spring may fall out due to a cause different from chattering of the valve body.

That is, the compression coil spring is exposed in the fluid flow path in the valve housing, that is, in the fluid flow region inside the valve housing, and is exposed to the fluid flow flowing into the valve chamber from the side of the valve body. If the high differential pressure continues when the valve is opened, the compression coil spring is deformed by the force of the fluid, and the valve seat side end is pulled up to the valve body side and rides on the valve seat part, The spring may fall off the valve seat.

When the compression coil spring falls off from the valve body or the valve seat portion in this way, the compression coil spring is sandwiched between the valve body and the valve seat portion, which hinders normal valve operation.

The present invention has been made to solve the above-mentioned problems, and provides a valve device improved so that a compression coil spring (valve spring) does not drop from a valve body or a valve seat portion. It is an object.

[0012]

In order to achieve the above object, a valve device according to the present invention has a valve body movably provided in a valve housing, and the valve body is provided between the valve housing and the valve body. In a valve device provided with a compression coil spring for urging the valve element in a valve opening direction or a valve closing direction, a thick reverse taper shaft portion is formed in a spring connection portion of the valve element, and the compression coil spring is The inner diameter of one winding end portion is smaller than the outer diameter of the thickest portion of the inverse taper shaft portion in the free state, and the one winding end portion of the compression coil spring is fitted on the outer circumference of the taper of the inverse taper shaft portion. The compression coil spring is connected to the valve body in a retaining state by the fitting.

If the one winding end portion of the compression coil spring has a straight cylindrical shape in a free state, the inner diameter of the one winding end portion of the compression coil spring has the inverse taper shaft shape. It may be approximately equal to the outer diameter of the smallest part of the part.

According to this valve device, the winding end portion having the inner diameter smaller than the outer diameter of the thickest portion of the reverse taper shaft portion fits in the outer circumference of the taper of the thick reverse taper shaft portion, By this fitting, the compression coil spring is connected to the valve body in a state in which it does not come off.Therefore, in order to prevent the compression coil spring from coming off the valve body, the winding end of the compression coil spring is the thickest at the tip of the reverse taper shaft. It is necessary to get over the portion, and the pull-out resistance of the compression coil spring from the valve body is improved.

In order to achieve the above-mentioned object, in the valve device according to the present invention, a valve body is movably provided in a valve housing, and the valve body is provided between the valve housing and the valve body. In a valve device provided with a compression coil spring for urging in an opening direction or a valve closing direction, a valve body receiving hole is formed in the valve housing for movably receiving the valve body in a valve opening / closing direction. A spring arrangement chamber having an annular cross section is defined in an intermediate portion of the valve body receiving hole separated from the fluid flow region, and the compression coil spring is arranged in the spring arrangement chamber.

According to this valve device, since the compression coil spring, which is the valve spring, is arranged in the spring arrangement chamber that is separated from the fluid flow region inside the valve housing, the compression coil spring is exposed to the fluid flow. Therefore, the compression coil spring is not affected by the fluid flow.

In the valve device according to the present invention, the valve body opens and closes due to the pressure difference acting on both sides of the valve body, and the compression coil spring has the valve body seated on the valve seat portion on the valve housing side. The valve device is of a type that, when in the closed position, is compressed and deformed to urge the valve element in the valve opening direction.

Further, in the valve device according to the present invention, a pressure chamber that is in constant communication with the primary-side valve chamber is defined on the back side of the valve body, and the valve body controls the internal pressure of the pressure chamber on the back side. It extends in the closing direction and is seated on the valve seat portion on the valve housing side at the tip end surface thereof, and the compression coil spring is deformed by compression when the valve body is in the fully closed position where the valve body is seated on the valve seat portion. A body is biased in a valve opening direction, a pilot passage is formed through the valve body between a front end surface and a back surface of the valve body, and an electromagnetic coil device is attached to the valve housing. Is a pilot type solenoid valve configured to open and close the pilot passage, and the compression coil spring guarantees valve opening when there is no differential pressure.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. (Embodiment 1) FIGS. 1 and 2 show one embodiment in which the valve device according to the present invention is applied to a pilot type solenoid valve used in a refrigeration cycle device or the like.

The pilot solenoid valve is generally designated by the numeral 10. The valve housing 11 of the pilot type solenoid valve 10 includes a housing body 11A and a housing body 11
The plug member 11B screwed to A is connected to the inlet 12 with a strainer connected to the upstream side (high pressure side = primary side) of the fluid passage and the downstream side (low pressure side = secondary side). An outlet 13, an internal passage 14 that communicates the inlet 12 and the outlet 13, a main valve port 16 defined by a valve seat portion 15 formed on the way of the internal passage 14, and a main valve port 16 is opened and closed. Primary valve chamber 1 that accommodates the main valve body 18
7 and 7.

The main valve body 18 has a valve body 18A having a pilot passage 19 which will be described later formed at the center thereof, and a valve body 1
The outer cylinder body 18B is crimp-fitted to the outer circumference of the housing 8A, and is fitted to a valve body holding hole (valve body receiving hole) 20 formed in the housing body 11A so as to be vertically movable. The main valve body 18 closes the main valve port 16 by seating on the valve seat portion 15 at the front end surface 18C, and moves upward from the fully closed position seated on the valve seat portion 15 to move the valve seat portion 1
The main valve port 16 is opened apart from 5.

The main valve body 18 defines a pressure chamber 21 on the rear surface side, and the inner pressure of the pressure chamber 21 is exerted on the rear surface 18D. The movement of the main valve body 18 in the opening direction is restricted by the pilot passage 19 Is opened and the pressure introduced into the pressure chamber 21 is switched from the primary side pressure to the secondary side pressure. This is performed by the pressure difference between the primary side pressure and the secondary side pressure acting on the main valve body 18, and the main valve The movement of the body 18 in the closing direction is performed by the plunger spring 25 described later.
Is performed by the spring force of.

The pressure chamber 21 is in constant communication with the valve chamber 17 (inflow port 12) through a gap 22 existing between the outer peripheral surface of the main valve body 18 and the inner peripheral surface of the valve body holding hole 20. Main valve body 18
A pilot passage 19 is formed so as to penetrate between the tip surface 18C and the back surface 18D, and the pressure chamber 21 is opened to the tip surface 18C by the pilot passage 19.

The pilot passage 19 is opened and closed at the opening end on the pressure chamber 21 side by a pilot valve body portion 24A formed by a plunger 24 of an electromagnetic coil device 23 attached to the plug member 11B. The electromagnetic coil device 23 includes a coil 25.
When no current is applied to the plunger 24, the spring force of the plunger spring 26 causes the plunger 24 to move as shown in FIG.
When the coil 25 is moved downward and the coil 25 is energized, as shown in FIG. 2, the plunger 24 is moved upward against the spring force of the plunger spring 26, and the plunger 24 is magnetically moved to the suction element 27. Adsorb to.

A compression coil spring 28 is provided between the valve housing 11 and the main valve body 18. The compression coil spring 28 is a valve spring weaker than the spring force of the plunger spring 26, and is compressed and deformed to open the main valve body 18 at least when the main valve body 18 is at the fully closed position seated on the valve seat portion 15. The main valve body 18 is hopped up at the initial valve opening operation of the main valve body 18 even when the main valve body 18 is biased in the direction.

The compression coil spring 28 includes the valve housing 11
On the side, the conical spring portion 28A is seated on the spring receiving surface 11C of the valve housing 11, and on the side of the main valve body 18 is a straight cylindrical shape, and the winding end portion 28C of this straight cylindrical spring portion 28B ( 2) is locked to a spring connection portion 29 formed on the lower side of the main valve body 18.

As shown in FIG. 3, the spring connecting portion 29 of the main valve body 18 is formed with a thick reverse taper shaft portion 30, and a compression coil spring is formed around the reverse taper shaft portion 30. 28
The winding end portion 28C is fitted, and by this fitting, the compression coil spring 28 is connected to the main valve body 18 in a state in which it does not come off.

In the free state, the winding end portion 28C of the compression coil spring 28 has a straight cylindrical shape similar to the straight cylindrical shape 18B, and the inner diameter Da of the winding end portion 28C is the finest portion 30A of the inverse taper shaft portion 30. It is set substantially equal to the outer diameter Db and smaller than the outer diameter Dc of the thickest portion 30B of the reverse taper shaft portion 30. For example, when the inner diameter Da of the winding end portion 28C is 9.1 to 9.3 mm, the outer diameter Db of the smallest portion 30A of the inverse taper shaft portion 30 is 9.0 to 9.2 mm and the thickest portion 3
The outer diameter Dc of 0B is set to about 9.7 to 9.9 mm.

The winding end portion 28C of the compression coil spring 28 is fitted to the taper outer circumference of the reverse taper shaft-shaped portion 30 while being deformed in accordance with the taper outer circumference shape of the reverse taper shaft-shaped portion 30. Therefore, in order for the compression coil spring 28 to slip off from the main valve body 18, the winding end portion 28C of the compression coil spring 28 must overcome the thickest portion 30B at the tip of the inverse taper shaft-shaped portion 30. A tighter interference fit than that of the conventional one is obtained, and even if the compression coil spring 28 deviates in the direction away from the main valve body 18 due to the tensile force, the spring force acting in the radial direction causes the taper of the reverse taper shaft-shaped portion 30. Return to the original position along the outer peripheral surface.

As a result, the pull-out resistance of the compression coil spring 28 from the main valve body 18 is improved, and the compression coil spring 28 is exposed to the fluid flow in the fluid flow region within the valve housing 11 and compressed. The coil spring 28 is deformed by the force of the fluid flowing in the valve chamber 17, or the outlet side in the valve housing 11 temporarily becomes a higher pressure than the inlet side and the main valve body 18 causes chattering. However, the compression coil spring 28 does not fall off the main valve body 18.

The winding end portion 28C of the compression coil spring 28 is
In the free state, the shape in the free state is not limited to the straight cylindrical shape, and if the inner diameter of the winding end portion 28C is smaller than the outer diameter of the thickest portion of the inverse taper shaft-shaped portion in the free state, it has a conical shape. Good.

The opening / closing operation of the pilot type solenoid valve having the above configuration will be described. When the coil 25 of the electromagnetic coil device 23 is not energized and is not energized, as shown in FIG.
When the pilot valve body 24A closes the pilot passage 19 by the spring force of the compression coil spring 2
The main valve body 18 is lowered against 8. As a result, the front end surface 18C of the main valve body 18 is seated on the valve seat portion 15 and the main valve port 16 is closed, resulting in a fully closed state.

When the main valve body 18 is in the fully closed position for obtaining a fully closed state, the compression coil spring 28 is deformed by compression and the main valve body 1 is compressed.
8 is urged in the valve opening direction, but in this state, the valve closed state is maintained by the spring force of the plunger spring 26.

When the coil 25 of the electromagnetic coil device 23 is energized in the above valve closed state, the plunger 24 moves upward against the spring force of the plunger spring 26, as shown in FIG. It is magnetically attracted to the suction element 27. As a result, the pilot valve body portion 24A becomes the main valve body 18
Further away, the pilot passage 19 is opened, the secondary side pressure is introduced into the pressure chamber 21 by the pilot passage 19, and the internal pressure of the pressure chamber 21 is reduced. When the internal pressure of the pressure chamber 21 decreases and the valve closing force decreases, the valve opening force due to the internal pressure of the valve chamber 17 overcomes the valve closing force, and the main valve body 18 floats (hops up) from the valve seat portion 15.

When there is no differential pressure between the primary side pressure and the secondary side pressure, the main valve body 18 separates from the valve seat portion 15 by the spring force of the compression coil spring 28 as the plunger 24 moves upward, and Open.

(Second Embodiment) FIGS. 4 and 5 show another embodiment in which the valve device according to the present invention is applied to a pilot type solenoid valve used in a refrigeration cycle device or the like.

The pilot solenoid valve is generally designated by the numeral 60. The valve housing 31 of the pilot-type solenoid valve 60 has an inlet 32 connected to the upstream side (high pressure side = primary side) of the fluid passage and an outlet 33 connected to the downstream side (low pressure side = secondary side). , Valve seat portion 3 formed on the outflow port 33 side
The main valve port 36 defined by 5 and the main valve port 36
And a valve chamber 37 on the primary side that accommodates a main valve body 38 that opens and closes.

The main valve body 38 is fitted in a valve body holding hole (valve body receiving hole) 40 formed in the valve housing 31 so as to be vertically movable. The main valve body 38 closes the main valve port 36 by sitting on the valve seat portion 35 at the front end surface 38A,
By moving upward from the fully closed position seated on the valve seat portion 35, the main valve port 36 is opened apart from the valve seat portion 35. The upward movement of the main valve body 38 is restricted by the stopper ring 34 attached to the valve housing 31.

The main valve body 38 defines a pressure chamber 41 on the rear surface side, and the inner pressure of the pressure chamber 41 is exerted on the rear surface 38B. The movement of the main valve body 38 in the opening direction is caused by the pilot passage 39. Is opened and the pressure introduced into the pressure chamber 41 is switched from the primary side pressure to the secondary side pressure, which is performed by the pressure difference between the primary side pressure and the secondary side pressure acting on the main valve body 38. Movement of the body 38 in the closing direction is performed by a plunger spring 46 described later.
Is performed by the spring force of.

The pressure chamber 41 is always in communication with the valve chamber 37 (inflow port 32) through a gap 42 existing between the outer peripheral surface of the main valve body 38 and the inner peripheral surface of the valve body holding hole 40. Main valve body 38
A pilot passage 39 is formed so as to penetrate between the tip surface 38A and the back surface 38B, and the pressure chamber 41 is opened to the tip surface 38A by the pilot passage 39.

The pilot passage 39 is opened and closed at the opening end on the pressure chamber 41 side by a ball valve body (pilot valve body) 48 fixed to a plunger 44 of an electromagnetic coil device 43 attached to the valve housing 31. Electromagnetic coil device 4
No. 3, when the coil 45 is not energized, as shown in FIG. 4, the plunger 44 is moved downward by the spring force of the plunger spring 46, and when the coil 45 is energized, as shown in FIG. As shown, the plunger 44 is moved upward against the spring force of the plunger spring 46 and magnetically attracted to the suction element 47.

An annular step portion 31A on the valve housing 31 side and an annular step portion 38C on the main valve body 38 side are provided inside the valve housing at an intermediate portion in the axial direction of the valve element holding hole 40 which is a valve element receiving hole. A fluid flow region, that is, a spring placement chamber 49 having an annular cross section separated from the valve chamber 37 is defined between the inner peripheral surface of the valve body holding hole 40 and the outer peripheral surface of the valve body holding hole 40.

A compression coil spring 50 is placed in the spring placement chamber 49. The compression coil spring 50 is a valve spring weaker than the spring force of the plunger spring 46, and is seated on the annular step 31A on the housing 31 side at one end (lower end) and on the main valve body 38 side at the other end (upper end). When seated on the annular step portion 38C and at least in the fully closed position where the main valve body 38 is seated on the valve seat portion 35, the main valve body 38 is compressed and deformed to urge the main valve body 38 in the valve opening direction, and even in the non-differential pressure state. The main valve body 38 is hopped up at the initial opening operation of the main valve body 38.

In this embodiment, the compression coil spring 50 is used.
Is in the spring arrangement chamber 49 separated from the valve chamber 37, the compression coil spring 50 is not exposed to the fluid flow and is not affected by the fluid flow. As a result, the compression coil spring 50 is not deformed by the force of the fluid flowing in the valve chamber 37, and even at high pressure and large flow rate,
The compression coil spring 50 does not fall off from the main valve body 38 or cause obstacles such as riding on the valve seat portion 35.

The opening / closing operation of the pilot type solenoid valve having the above configuration will be described. When the coil 45 of the electromagnetic coil device 43 is not energized and is not energized, as shown in FIG.
The main valve body 38 is lowered against the compression coil spring 50 while the ball valve body 48 closes the pilot passage 39 by the spring force of. As a result, the front end surface 38A of the main valve body 38 is seated on the valve seat portion 35, and the main valve port 36 is fully closed.

When the main valve body 38 is in the fully closed position for obtaining the fully closed state, the compression coil spring 50 is compressed and deformed, and the main valve body 3 is compressed.
8 is urged in the valve opening direction, but in this state, the valve closed state is maintained by the spring force of the plunger spring 50.

When the coil 45 of the electromagnetic coil device 43 is energized in the above-described valve closed state, the plunger 44 moves upward against the spring force of the plunger spring 46, as shown in FIG. It is magnetically attracted to the suction element 47. As a result, the ball valve body 48 is separated from the main valve body 38, the pilot passage 39 is opened, and the pilot passage 39 is opened.
The secondary side pressure is introduced into the pressure chamber 41 by the
The internal pressure of is reduced. When the internal pressure of the pressure chamber 41 decreases and the valve closing force decreases, the valve opening force due to the internal pressure of the valve chamber 37 overcomes the valve closing force, and the main valve body 38 floats (hops up) from the valve seat portion 35.

When there is no differential pressure between the primary side pressure and the secondary side pressure, the main valve element 38 separates from the valve seat portion 35 by the spring force of the compression coil spring 50 as the plunger 44 moves upward, and Open.

The structure for connecting the compression coil spring to the valve body is not limited to the pilot type solenoid valve described above, but various solenoid valves, pressure control valves such as pressure regulators, and other various valves. Can be applied in the device,
Further, the compression coil spring may be a valve closing spring that biases the valve body in the valve closing direction, other than the valve opening spring that biases the valve body in the valve opening direction.

[0050]

As can be understood from the above description, according to the valve device of the present invention, the thickest portion of the reverse taper shaft portion is provided on the outer periphery of the thick reverse taper shaft portion in the free state of the compression coil spring. The winding end with an inner diameter smaller than the outer diameter of the section is fitted, and the fitting causes the compression coil spring to be connected to the valve body in a state that it does not come off. The winding end of the spring must ride over the thickest part of the tip of the reverse taper shaft, the pull-out resistance of the compression coil spring from the valve body is improved, and even if the valve body chatters, The compression coil spring does not fall off the valve body, and the operational reliability is improved.

Further, according to the valve device of the present invention, since the compression coil spring, which is the valve spring, is arranged in the spring arrangement chamber which is separated from the fluid flow region inside the valve housing, the compression coil spring flows in the fluid flow direction. Since the compression coil spring is not exposed to the inside and is not affected by the flow of fluid, the compression coil spring is deformed by the force of the fluid even if the high differential pressure continues when the valve is opened. The end portion of the compression coil spring is not pulled up to the valve body side and rides on the valve seat portion, and the drop resistance of the compression coil spring from the valve seat portion is improved and the operation reliability is improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing a valve closed state of a first embodiment in which a valve device according to the present invention is applied to a pilot type solenoid valve.

FIG. 2 is a sectional view showing a valve open state of the first embodiment in which the valve device according to the present invention is applied to a pilot type solenoid valve.

FIG. 3 is an enlarged sectional view showing a main part of an embodiment of a valve device according to the present invention.

FIG. 4 is a sectional view showing a valve closed state of a second embodiment in which the valve device according to the present invention is applied to a pilot type solenoid valve.

FIG. 5 is a sectional view showing a valve open state of a second embodiment in which the valve device according to the present invention is applied to a pilot type solenoid valve.

FIG. 6 is a sectional view of a conventional pilot type solenoid valve.

FIG. 7 is a sectional view showing a conventional spring mounting structure for a pilot type solenoid valve.

[Explanation of symbols]

10,60 Pilot type solenoid valve 11 valve housing 15 valve seat 16 Main valve port 17 valve chamber 18 Main valve body 19 Pilot passage 23 Electromagnetic coil device 24 Pilot valve body 28 Compression coil spring 30 Reverse taper shaft 33 valve housing 35 valve seat 36 Main valve port 37 valve chamber 38 Main valve body 39 Pilot passage 43 Electromagnetic coil device 48 Pilot valve body 50 compression coil spring 60 Pilot type solenoid valve

Continued front page    (72) Inventor Norio Maruyama             535 Sasai, Sayama City, Saitama Prefecture Sagimiya Co., Ltd.             Tokoroyama Office (72) Inventor Shigetoshi Nakajima             535 Sasai, Sayama City, Saitama Prefecture Sagimiya Co., Ltd.             Tokoroyama Office (72) Inventor Kenichi Murakoshi             535 Sasai, Sayama City, Saitama Prefecture Sagimiya Co., Ltd.             Tokoroyama Office (72) Inventor Kazuto Aihara             535 Sasai, Sayama City, Saitama Prefecture Sagimiya Co., Ltd.             Tokoroyama Office F-term (reference) 3H106 DA07 DA13 DA23 DA35 DB02                       DB12 DB23 DB32 DC06 DC17                       DD02 EE27 GA23 GB06 GB08                 3J059 AE01 BA02 BA05 CB07 CC01                       GA39

Claims (5)

[Claims] 1. A valve body is movably provided in a valve housing, and a compression coil spring for urging the valve body in a valve opening direction or a valve closing direction is provided between the valve housing and the valve body. In the valve device, a thick reverse taper shaft portion is formed in the spring connection portion of the valve body, and the compression coil spring has the thickest reverse taper shaft portion when the inner diameter of one winding end is free. Smaller than the outer diameter of the part,
The one winding end portion of the compression coil spring is fitted to the outer circumference of the taper of the reverse taper shaft portion, and the compression coil spring is connected to the valve body in a retaining state by the fitting. Valve device. 2. The one winding end of the compression coil spring has a straight cylindrical shape in a free state, and the inner diameter of the one winding end is substantially equal to the outermost diameter of the inverse taper shaft portion. The valve device according to claim 1, wherein: 3. A valve body is movably provided in the valve housing, and a compression coil spring is provided between the valve housing and the valve body to urge the valve body in a valve opening direction or a valve closing direction. In the valve device described above, a valve body receiving hole is formed in the valve housing for movably receiving the valve body in the valve opening / closing direction, and the valve body receiving hole is formed at an intermediate portion of the valve body receiving hole isolated from a fluid flow region inside the valve housing. A valve device, wherein a spring arrangement chamber having an annular cross section is defined, and the compression coil spring is arranged in the spring arrangement chamber. 4. The valve body opens and closes due to a pressure difference acting on both sides of the valve body, and the compression coil spring is in a fully closed position where the valve body is seated on a valve seat portion on the valve housing side. The valve device according to any one of claims 1 to 3, wherein the valve element is compressed and deformed to urge the valve element in a valve opening direction. 5. A pressure chamber, which is in constant communication with the valve chamber on the primary side, is defined on the back side of the valve body, and the valve body is provided with the internal pressure of the pressure chamber on the back side in the valve closing direction and the tip end. Surface is seated on the valve seat portion on the valve housing side, and the compression coil spring is compressed and deformed when the valve body is in the fully closed position where the valve body is seated on the valve seat portion so that the valve body is attached in the valve opening direction. The valve body has a pilot passage formed between the front end surface and the back surface of the valve body, an electromagnetic coil device is attached to the valve housing, and a pilot valve body formed by a plunger of the electromagnetic coil device is formed. The valve device according to claim 1, wherein the valve device is configured to open and close the pilot passage.