JP2002372164A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid valve capable of providing sufficient sealing even when a valve element is seated in an inclined state to the axial direction of a valve seat and miniaturizing a solenoid part driving the valve element. SOLUTION: The ball valve seat 11 bored with a valve hole is arranged midway in a passage, and the cylindrical valve element is arranged capable of approaching and separating from the upstream to the ball valve seat 11. The valve element is composed of a plunger 13 used as a moving core of the solenoid part 2. By this, since the plunger 13 is seated in a curved surface of the same shape even when it obliquely contacts the ball valve seat 11, the plunger 13 can be closely sealed against the ball valve seat 11. A communication groove 14 is formed in an outer circumference part of the plunger 13, a back pressure canceling structure not depending on fluid pressure is provided, solenoid force necessary in valve opening is reduced, and the solenoid part 2 is miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve, and more particularly to a solenoid valve capable of controlling switching of a high-pressure fluid with a small solenoid force.

[0002]

2. Description of the Related Art Conventionally, an electromagnetic valve has been used for switching a fluid. In general, an electromagnetic valve includes a solenoid unit that opens and closes a valve body and a valve unit that opens and closes a flow path with the valve body. The solenoid portion is provided with an electromagnetic coil to which a control current is supplied from the outside, a core as a fixed iron core fixed at the axial position of the electromagnetic coil, and an axially movable back and forth at the axial position of the electromagnetic coil. It has a plunger serving as a movable iron core, and a spring for urging the plunger against the valve body of the valve portion in the opening or closing direction when the electromagnetic coil is not energized. Further, the valve portion is opened and closed by two ports formed in the body, a valve seat disposed between both ports and integrally formed with the body, and a plunger of a solenoid portion disposed to face the valve seat. A driven valve element.

Depending on the shape of the valve body, a flat valve whose valve seat is closed by a flat surface, a tapered valve that opens and closes a conical one in and out of the valve hole, and a needle-like one that opens and closes in the valve hole There is known a needle valve for performing the above.

[0004]

However, in the taper valve or the needle valve, the axial position of the valve seat does not coincide with the reciprocating direction of the valve body, or the taper valve or the needle valve is slightly inclined with respect to the axial direction of the valve seat. In such a case, there is a problem that a gap may be formed between the valve and the valve seat, and the sealing may be incomplete and fluid leakage may occur at the valve portion. Further, when switching the high-pressure fluid, the solenoid unit for driving the valve body needs a solenoid force higher than the pressure applied to the valve body, and thus there is a problem that the solenoid unit becomes large.

The present invention has been made in view of such a point, and a sufficient seal can be obtained even when the valve is seated with the valve body inclined with respect to the axial direction of the valve seat. An object of the present invention is to provide an electromagnetic valve that can reduce the size of a solenoid unit that drives a body.

[0006]

According to the present invention, in order to solve the above-mentioned problems, in a solenoid valve provided with a valve portion and a solenoid portion, a valve hole is provided in the middle of a fluid passage and provided at a central axis position. A valve seat having a spherical shape on the valve seat surface, and disposed so as to be able to advance and retreat in an axial direction from an upstream side of the valve seat, and an opening having a diameter larger than the valve hole is formed at a center axis position, A cylindrical plunger functioning as a valve body for a seat, a shaft that is inserted through the opening of the plunger, and has at least one groove formed in an end face facing the valve seat and passing through the center; and the valve of the plunger. A core fixedly disposed at an axial position opposite to the side on which the seat is provided, and a first spring for urging the plunger in a direction for seating the plunger on the valve seat are provided. Provided by solenoid valve It is.

According to such an electromagnetic valve, a valve seat having a spherical valve seat surface is used, a cylindrical plunger of a solenoid portion is used as a valve body, and an end face of the plunger is seated on the spherical valve seat. I have to. Accordingly, even if the plunger is seated on the valve seat in an inclined state due to the clearance between the sleeve and the sleeve required to make the plunger movable, the relative shape between the end surface of the plunger and the valve seat surface does not change. . For this reason, even if the axis of the plunger is shifted,
The state is the same as the state where the alignment is automatically performed, and the plunger can be tightly sealed to the valve seat.

Further, in the present invention, a plurality of communication grooves extending in the axial direction are formed in the outer peripheral portion of the plunger, and the fluid pressure on the inlet side is introduced to the end face of the plunger on the core side. As a result, the pressure of the fluid introduced to both end surfaces of the plunger, which is the valve body, is equally applied, and the plunger does not depend on the pressure of the fluid. Therefore, the solenoid force for driving the plunger can be reduced, and the size of the solenoid can be reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings, taking an example in which the present invention is applied to a two-way solenoid valve and a three-way solenoid valve.

FIG. 1 is a central longitudinal sectional view showing a non-energized state of a two-way solenoid valve according to a first embodiment of the present invention. FIG. 2 is a two-way solenoid valve according to the first embodiment of the present invention. It is a center longitudinal cross-sectional view which shows the state at the time of energization of a solenoid valve.

The two-way solenoid valve according to the first embodiment comprises a valve portion 1 provided at a lower portion and a solenoid portion 2 provided at an upper portion. The valve section 1 has an inlet port 4 and an outlet port 5 provided on a side surface of the body 3. A case 6 is press-fitted into the flow path between the inlet port 4 and the outlet port 5 from an upper opening. The case 6 is formed with an annular fluid introduction groove 7 communicating with the inlet port 4, and the fluid introduction groove 7 communicates with a space 8 recessed in the upper center via a passage 9. Case 6
In addition, a ball valve seat 1 having a passage 10 formed at a central axial position and a valve hole formed in an axial direction at an upper end thereof.
1 is fixed by caulking.

The solenoid 2 has a sleeve 12 whose lower end is welded to the upper part of the case 6. Below the sleeve 12, a plunger 13 serving as a movable iron core is inserted and arranged so as to be able to advance and retreat in the axial direction. The plunger 13 has a cylindrical shape with an opening formed at the center axis thereof, and the lower end surface thereof is provided with the ball valve seat 1.
A valve body that opens and closes the flow path by operating toward and away from the valve 1 is formed. In the plunger 13, a plurality of communication grooves 14 extending in the axial direction are formed in the outer peripheral portion,
The back pressure canceling structure is such that the fluid pressure applied to the surface on the ball valve seat 11 side and the fluid pressure applied to the opposite surface are equal. A core 15 serving as a fixed iron core is provided above the sleeve 12.
Is screwed. The shaft 1 is inserted between the core 15 and the ball valve seat 11 through the opening of the plunger 13.
6 are arranged. The distal end of the shaft 16 is reduced in diameter so as to form an annular space between the shaft 16 and the opening of the plunger 13, and an end face is formed with a single groove passing through the center. It communicates with the valve hole of the ball valve seat 11 through the groove. Plunger 1
A spring 17 for urging the plunger 13, which is a valve body, to be seated on the ball valve seat 11 is arranged between the core 3 and the core 15. An electromagnetic coil 18 is arranged on the outer periphery of the sleeve 12, and the outside thereof is surrounded by a yoke 19. The lower end of the yoke 19 forms a part of a magnetic circuit of the solenoid unit 2 and is provided with a flange 20 for attaching to the body 3 of the valve unit 1.
The upper end is closed by a lid 21. Further, a wiring 22 for supplying a control current from the outside and opening and closing the two-way electromagnetic valve is connected to the electromagnetic coil 18.

Here, as shown in FIG. 1, when the solenoid portion 2 is not energized, the plunger 13 as a valve body is seated on the ball valve seat 11 by the spring 17 and the fluid passage is closed. I have. Here, when a high-pressure fluid flows in from the inlet port 4, the fluid flows into the case 6.
And is introduced into the space 8 through the passage 9. The fluid introduced into the space 8 is also the plunger 1
3 is also introduced to the back side of the plunger 13 through a communication groove 14 provided around the periphery of the plunger 3. Thereby, the plunger 13
Since the introduced fluid pressure is received at the same pressure from both sides in the axial direction, the pressure of the fluid is not affected by the control of the valve element by the solenoid force.

Further, since the ball valve seat 11 has a spherical valve seat surface, the sealing performance with the plunger 13 can be improved. That is, the plunger 13 is
Because it is disposed so as to be able to advance and retreat in the axial direction, there is a clearance between the inside and the inner wall surface of the sleeve 12. For this reason, the plunger 13 is inclined with respect to the axial direction in the sleeve 12, and when the valve is closed, the plunger 13 is seated on the ball valve seat 11 in an inclined state. However, since the seating surface is spherical, even if the plunger 13 is seated on the ball valve seat 11 in an inclined state, the relative shape of the seating portion between the plunger 13 and the ball valve seat 11 does not change. Does not occur, and sufficient sealing properties can be obtained.

Next, when the solenoid portion 2 is energized, the plunger 13 which does not receive a high-pressure load is attracted to the core 15 against the urging force of the spring 17 as shown in FIG. Thereby, the plunger 13 is connected to the ball valve seat 1.
1, the annular space between the reduced diameter portion at the tip of the shaft 16 and the opening of the plunger 13
The valve is opened by being opened to a flow path communicating with the inlet port 4. As a result, the fluid introduced into the inlet port 4 flows to the outlet port 5 through the groove formed in the end face of the shaft 16, the valve hole of the ball valve seat 11, and the passage 10 of the case 6.

FIG. 3 is a central longitudinal sectional view showing a state where a two-way solenoid valve according to a second embodiment of the present invention is not energized.
3, the same elements as those shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

The two-way solenoid valve according to the second embodiment is configured to be movable in the axial direction without fixing the ball valve seat 11. That is, a pipe 23 whose one end is spot-welded to the ball valve seat 11 is slidably disposed in the central opening of the case 6 such that the central passage communicates with the valve hole. The pipe 23 is also held by a guide 24 pressed into the central opening of the case 6, and a spring 25 is arranged between the guide 24 and the ball valve seat 11. The guide 24 is provided in the case 6
Also functions to prevent the O-ring 26 provided between the central opening and the pipe 23 from coming off.

In the two-way solenoid valve having the above-described structure, when the solenoid portion 2 is not energized, the ball valve seat 11 is pressed against the lower end surface of the shaft 16 by the spring 25 and the spring 17 as shown in FIG. The fluid passage is closed by seating the plunger 13 as a valve body on the ball valve seat 11. Here, when a high-pressure fluid flows in from the inlet port 4, the fluid enters the fluid introduction groove 7 of the case 6, is introduced into the space 8 via the passage 9, and further communicates with the communication groove 14 around the plunger 13. Through the plunger 13. At this time, the plunger 13 is seated on the ball valve seat by the biasing force of the spring 17 and maintains the valve closed state by the back pressure canceling structure that does not receive the high pressure load.

Next, when the solenoid portion 2 is energized, the plunger 13 is attracted by the core 15 against the urging force of the spring 17 and moves in a direction away from the ball valve seat 11, and the tip of the shaft 16 is moved. Diameter part of plunger and plunger 13
Is opened to the flow path communicating with the inlet port 4 to be in a valve-open state. As a result, the fluid introduced into the inlet port 4 flows to the outlet port 5 through the groove formed in the end face of the shaft 16, the valve hole of the ball valve seat 11, and the passage 10 of the case 6.

Next, when the solenoid portion 2 is de-energized again, the plunger 13 loses the attraction force to the core 15 and is urged by the spring 17 to be seated on the ball valve seat 11 to close the fluid passage. . At this time, plunger 1
3 collides with the ball valve seat 11 to close the valve.
5, the impact of the plunger 13 on the ball valve seat 11 is absorbed by the spring 25. Thereby, the impact sound when the plunger 13 hits the ball valve seat 11 can be reduced. In general, the ball valve seat 11 is hard, and the plunger 13 is softer than the ball valve seat 11. However, since the impact load generated when the plunger 13 hits the ball valve seat 11 can be reduced, wear of the plunger 13 is reduced. be able to.

FIG. 4 is a central longitudinal sectional view showing a non-energized state of a three-way solenoid valve according to a third embodiment of the present invention, and FIG. 5 is a three-way solenoid valve according to the third embodiment of the present invention. FIG. 4 is a central vertical cross-sectional view showing a state at the time of energization.

The three-way solenoid valve according to the third embodiment comprises a valve portion 31 provided at a lower portion and a solenoid portion 32 provided at an upper portion. An inlet port 34 and a first outlet port 35 are provided on the side surface of the body 33 of the valve portion 31, and a second outlet port 3 is provided on the top of the solenoid portion 32.
6 is provided.

The flow passage between the inlet port 34 and the first outlet port 35 of the valve portion 31 is provided with a case 3 through an upper opening.
7 is press-fitted. This case 37 is connected to the entrance port 3
An annular fluid introduction groove 38 communicating with the passage 4 is formed, and the fluid introduction groove 38 is formed in a space 39 recessed in the upper center.
It is communicated through 0. In the case 37, a passage 41 is formed at a central axis position, and a ball valve seat 42 having a valve hole formed in an axial direction is fixed to an upper end portion thereof by caulking.

The lower end surface of the solenoid portion 32 has a case 37.
Sleeve 43 having an inner diameter substantially equal to the inner diameter of the space 39 of FIG.
It has. Above the sleeve 43, a core 44 is provided.
A passage 45 is formed in the center of the core 44 at an axial position, and the upper end of the passage 45 is provided with a second outlet port 36.
A ball valve seat 46 having a valve hole formed in the axial direction at the lower end is fixed by caulking.

The ball valve seat 4 is provided below the sleeve 43.
A plunger 47 having a length shorter than the distance between the two 46 is fitted and arranged so as to be able to advance and retreat in the axial direction. The plunger 47 has an opening at the center axis thereof, through which the shaft 48 is inserted. Both ends of the shaft 48 are reduced in diameter to form an annular space between the shaft 48 and the opening of the plunger 47, and a single groove passing through the center is formed on the end face. Through the groove, it communicates with the valve holes of the ball valve seats 42 and 46. A plurality of passages 49 extending in the axial direction are formed on the outer periphery of the plunger 47. In addition, the plunger 47 has a diameter reduced about half on the core 44 side to form a spring accommodating space between the plunger 47 and the sleeve 43. In this spring accommodating space, the plunger 47 is attached to the case 37.
A spring 50 is provided for urging the ball valve seat 42 to be seated on the ball valve seat 42 fixed thereto.

On the outer periphery of the sleeve 43, an electromagnetic coil 51 is provided.
Is arranged, and the outside thereof is surrounded by a yoke 52. The lower end of the yoke 52 is
And a flange 53 for attaching to the body 33 of the valve portion 31 is provided. Further, a wiring 54 for supplying a control current from the outside and switching the three-way solenoid valve is connected to the electromagnetic coil 51.

Here, as shown in FIG. 4, when the solenoid 32 is not energized, the plunger 47, which is a valve body, is seated on the ball valve seat 42 by the spring 50, You are away. Here, when the high-pressure fluid flows in from the inlet port 34, the fluid enters the fluid introduction groove 38 of the case 37 and passes through the passage 40.
Through the space 39. The fluid introduced into the space 39 is introduced into the upper space of the plunger 47 via a passage 49 provided around the plunger 47 and a spring accommodating space, and from there, a groove formed on the distal end surface of the shaft 48, a ball valve, and the like. The valve hole of the seat 46 and the passage 4 of the core 44
5 to the second outlet port 36. At this time, since the ball valve seat 42 is closed by the plunger 47, no fluid flows to the first outlet port 35.

Next, when the solenoid 32 is energized,
The plunger 47 is, as shown in FIG.
It is sucked by the core 44 against the urging force of zero. As a result, the plunger 47 moves away from the ball valve seat 42 and moves in a direction of sitting on the ball valve seat 46. As a result, the fluid introduced into the inlet port 34 flows to the first outlet port 35 through the groove formed in the distal end surface of the shaft 48, the valve hole of the ball valve seat 42, and the passage 41 of the case 37. Become. That is, the flow of the fluid introduced into the inlet port 34 is switched from the second outlet port 36 to the first outlet port 35.

FIG. 6 is a central longitudinal sectional view showing a state where a three-way solenoid valve according to a fourth embodiment of the present invention is not energized, and FIG. 7 is a three-way solenoid valve according to a fourth embodiment of the present invention. FIG. 4 is a central vertical cross-sectional view showing a state at the time of energization. 6 and 7, the same elements as those shown in FIGS. 4 and 5 are denoted by the same reference numerals, and detailed description thereof will be omitted.

The three-way solenoid valve according to the fourth embodiment is the same as the ball valve seats 42, 4 of the three-way solenoid valve according to the third embodiment.
6 is configured to be movable in the axial direction without being fixed. That is, a pipe 55 whose one end is spot-welded to the ball valve seat 42 at the central opening of the case 37 is slidably disposed in the axial direction. This pipe 55 also
The case 37 is held by a guide 57 press-fitted into the central opening of the case 37 via an O-ring 56, and a spring 58 is arranged between the guide 57 and the ball valve seat 42. Similarly, a pipe 59 having one end spot-welded to the ball valve seat 46 at the center opening of the core 44 is slidably disposed in the axial direction. This pipe 59 also
The core 44 is held by a guide 61 press-fitted into a central opening of the core 44 via an O-ring 60, and a spring 62 is arranged between the guide 61 and the ball valve seat 46.

In the three-way solenoid valve having the above-described structure, when the solenoid portion 32 is not energized, as shown in FIG.
46 is pressed against both end surfaces of the shaft 48 from both directions, and a plunger 47 as a valve body is seated on the ball valve seat 42 by a spring 50. Here, when the high-pressure fluid flows in from the inlet port 34, the fluid enters the fluid introduction groove 38 of the case 37 and passes through the passage 40.
Through the space 39. The fluid introduced into the space 39 is introduced into the upper space of the plunger 47 via a passage 49 provided around the plunger 47 and a spring accommodating space, and from there, a groove formed on the distal end surface of the shaft 48, a ball valve, and the like. Valve hole of seat 46, pipe 59 and core 4
4 to the second outlet port 36 via the passage 45.

Next, when the solenoid 32 is energized,
The plunger 47 is, as shown in FIG.
0 is attracted to the core 44 against the urging force of the plunger 4.
7 moves away from the ball valve seat 42 and moves in a direction of sitting on the ball valve seat 46. At this time, the impact load when the plunger 47 is seated on the ball valve seat 46 is caused by the spring 6
2 to be absorbed. As a result, the fluid introduced into the inlet port 34 flows into the groove formed on the tip end surface of the shaft 48, the valve hole of the ball valve seat 42, the pipe 55 and the case 3.
7 to the first outlet port 35 via the passage 41.

Next, when the solenoid portion 32 is de-energized again, the plunger 47 loses the attraction force to the core 44 and is urged by the spring 50 to be separated from the ball valve seat 46 and seated on the ball valve seat 42. Move in the direction you want. At this time, since the impact load when the plunger 47 is seated on the ball valve seat 42 is absorbed by the spring 58, the impact sound and the wear of the plunger 47 can be reduced.

As described above, by controlling the energization of the solenoid portion 32, the flow path is selectively switched so that the fluid introduced from the inlet port 34 flows to the first outlet port 35 or the second outlet port 36. Can be.

[0035]

As described above, according to the present invention, the valve seat surface is formed into a spherical shape, and the cylindrical plunger constituting the valve body can be brought into and out of contact with the valve seat surface. Accordingly, even if the plunger is seated on the valve seat in the inclined state due to the clearance with the sleeve necessary to make the plunger movable, the relative shape between the end surface of the plunger and the valve seat surface does not change. In this state, the plunger is brought into close contact with the valve seat.

Further, the structure is such that the pressure of the fluid introduced to both end faces of the plunger as the valve body is equally applied.
Since the back pressure of the plunger is thereby canceled, the plunger does not depend on the pressure of the fluid, so that the solenoid force for driving the plunger can be reduced, and the size of the solenoid unit can be reduced.

Further, in the present invention, the valve seat having a spherical valve seat surface is received by a spring. Thereby, the load when the plunger collides with the valve seat can be absorbed by the spring, and the impact noise at the time of the switching operation can be reduced, and the wear of the plunger can be reduced.

As described above, as an embodiment of the present invention, a two-way solenoid valve for shutting off or opening a flow path and a three-way electromagnetic valve for switching and supplying fluid flowing from one inlet port to either the first or second outlet port. Although the case where the present invention is applied to a valve is shown, the solenoid valve according to the present invention is not limited to such an on / off driven solenoid valve, and the valve opening continuously changes in proportion to the current value supplied to the solenoid portion. The present invention can also be applied to a so-called proportional valve.

[Brief description of the drawings]

FIG. 1 is a central longitudinal sectional view showing a state when a two-way solenoid valve according to a first embodiment of the present invention is not energized.

FIG. 2 is a central longitudinal sectional view showing a state when energizing a two-way solenoid valve according to the first embodiment of the present invention.

FIG. 3 is a central longitudinal sectional view showing a state when a two-way solenoid valve according to a second embodiment of the present invention is not energized.

FIG. 4 is a central longitudinal sectional view showing a non-energized state of a three-way solenoid valve according to a third embodiment of the present invention.

FIG. 5 is a central longitudinal sectional view showing a state when energizing a three-way solenoid valve according to a third embodiment of the present invention.

FIG. 6 is a central longitudinal sectional view showing a state when a three-way solenoid valve according to a fourth embodiment of the present invention is not energized.

FIG. 7 is a central longitudinal sectional view showing a state when energizing a three-way solenoid valve according to a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve part 2 Solenoid part 3 Body 4 Inlet port 5 Outlet port 6 Case 7 Fluid introduction groove 8 Space 9 Passage 10 Passage 11 Ball valve seat 12 Sleeve 13 Plunger 14 Communication groove 15 Core 16 Shaft 17 Spring 18 Electromagnetic coil 19 Yoke 20 Flange DESCRIPTION OF SYMBOLS 21 Cover 22 Wiring 23 Pipe 24 Guide 25 Spring 26 O-ring 31 Valve part 32 Solenoid part 33 Body 34 Inlet port 35 First outlet port 36 Second outlet port 37 Case 38 Fluid introduction groove 39 Space 40 Passage 41 Passage 42 Ball valve seat 43 sleeve 44 core 45 passage 46 ball valve seat 47 plunger 48 shaft 49 passage 50 spring 51 electromagnetic coil 52 yoke 53 flange 54 wiring 55 pipe 56 O-ring 57 guide 58 splice Grayed 59 Pipe 60 O-ring 61 guide 62 Spring

Claims (7)

[Claims] 1. A solenoid valve comprising a valve portion and a solenoid portion, a valve seat disposed in the middle of a fluid passage, having a valve hole formed in a center axis position, and having a spherical valve seat surface. It is arranged to be able to advance and retreat in the axial direction from the upstream side of the seat,
An opening having a diameter larger than the valve hole is bored at the center axis position, and a cylindrical plunger functioning as a valve body for the valve seat is inserted through the opening of the plunger and faces the valve seat. A shaft having at least one groove formed in the end face passing through the center, a core fixedly arranged at an axial position on a side of the plunger opposite to a side where the valve seat is provided, and seating the plunger on the valve seat A first spring biasing in a direction in which the solenoid valve is caused to rotate. 2. The solenoid valve according to claim 1, wherein the valve seat is a ball having a hole formed in a center axis position and fixed in the middle of a fluid passage. 3. The valve seat according to claim 1, further comprising: a ball having a hole formed at a central axis position, and a valve provided slidably in the axial direction along the fluid passage so that a central passage communicates with the hole. The solenoid valve according to claim 1, further comprising a pipe having one end fixed to the ball, and a second spring for urging the ball to abut on an end surface of the shaft. 4. A tip end portion of the shaft, which is opposed to the valve seat, forms a space communicating with the downstream side through the valve hole between the shaft and the opening of the plunger when the valve is closed. The solenoid valve according to claim 1, wherein the solenoid valve is provided. 5. The plunger according to claim 1, wherein a plurality of communication grooves extending in an axial direction are formed in an outer peripheral portion to introduce an inlet-side fluid pressure to the core-side end surface. solenoid valve. 6. An electromagnetic valve provided with a valve portion and a solenoid portion, wherein the valve is disposed in the middle of a fluid passage between an inlet port and a first outlet port, and a valve hole is formed at a center axis position to provide a valve seat surface. A first valve seat having a spherical shape, a core fixedly disposed in the axial direction, having a fluid passage at a central axis position, one end of which forms a second outlet port, and a core disposed on the other end surface of the core. A second valve seat in which a valve hole is formed at a central axis position and a valve seat surface has a spherical shape; and a second valve seat is movable in an axial direction between the first valve seat and the second valve seat. An opening having a diameter larger than the valve hole is formed at a central axis position, and a plurality of communication grooves extending in the axial direction are formed in an outer peripheral portion, and both end surfaces are the first valve seat and the second valve seat. A cylindrical plunger functioning as a valve body for the valve seat of the plunger; and the opening of the plunger. A shaft having at least one groove formed at both end surfaces thereof and passing through the center thereof; and a first spring for biasing the plunger in a direction for seating the plunger on the first valve seat. And a solenoid valve. 7. The first valve seat is provided with a first ball having a hole formed at a center axis position, and the first valve seat is slidable in the axial direction along the fluid passage, and the central passage is provided with the first passage. A first ball fixed at one end to the first ball so as to communicate with the hole;
And a second spring for urging the first ball to abut one end surface of the shaft, wherein the second valve seat has a hole formed at a central axis position. A second pipe, and a second pipe slidably provided in the axial direction along the fluid passage of the core, one end of which is fixed to the second ball such that a central passage communicates with the hole. 7. The solenoid valve according to claim 6, further comprising a third spring for urging the second ball to contact the other end surface of the shaft.