CN1099537C - The electromagnetic valve - Google Patents

Abstract

The invention provides a solenoid valve having a structure capable of separating a part generating electromagnetic force and a valve part controlling fluid, and capable of improving the universality of parts and reducing the cost. The coil bobbin is wound with a coil and a case having an input hole, an output hole, and an output hole is formed separately. A bobbin having a valve element, a ball having a switching flow path, and a case having the valve element are disposed so as to face each other via a flat plate, and a claw of a case having a cap shape and mounted on the bobbin is caulked to the case and the flat plate to form a single body. The coil bobbin has a housing side end surface formed with an engaged portion, and a flat plate formed with a coil bobbin positioning engaging portion and a housing positioning engaging portion, and these engaging portions are engaged with the coil bobbin and the housing engaged portion to secure a relative positional relationship between the coil bobbin and the housing.

Description

The electromagnetic valve

technical field

The present invention relates to a solenoid valve, especially a solenoid valve that drives a solenoid device according to an electric signal, thereby switching a flow path.

Background technique

7 is a cross-sectional view showing a non-energized state of a conventional normally closed three-way solenoid valve.

In the drawing, a bobbin 1 is a resin molded product in which a flat plate 22 made of a magnetic material and terminals 6 and 7 are embedded, and a coil winding portion 1g is provided. An input hole 2, an output hole 3 and a discharge hole 4 are also provided on the bobbin 1, and O-shaped grooves 1a, 1b are provided, on which O-rings 9, 10 for preventing oil leakage are installed.

The spool 29 is made of magnetic material, and is arranged so as to be guided by the bobbin 1 so as to slide only in the up and down direction. The bushing 23 is also made of magnetic material, and is embedded in one end of the bobbin 1 without contacting the valve core 29 . The casing 11 is also made of magnetic material, installed on the outer periphery of the bobbin 1 where the coil 12 has been wound on the coil winding portion 1g, and fastened on the flat plate 22 by caulking. A seat 24 made of magnetic material is installed between the housing 11 and the bushing 23 to ensure the magnetic connection between the two. A non-magnetic seat 25 is mounted on one end of the bobbin 1 to hold the internal parts of the solenoid.

A ball 13 and a bushing 14 are inserted into the input hole 2 at the other end of the bobbin 1 , and the crimping portion 1 c of the bobbin 1 is thermally caulked to prevent the ball 13 from falling off. A valve stem 29a is integrally provided on the valve core 29 for pushing the ball 13 fitted in the input hole 2, and a valve portion 29b is formed at the base of the valve stem 29a.

Wherein, the magnetic circuit is formed by the housing 11 , the flat plate 22 , the valve core 29 , the bushing 23 and the ball 24 .

In the conventional solenoid valve 100 having such a structure, when the coil 12 is not energized, the ball 13 is seated on the valve seat 1e by the fluid pressure acting on the input hole 2, and the fluid does not flow in from the input hole 2, and, The stem 29a is pushed up by the movement of the ball 13 seated on the valve seat 1e. The upward movement of the valve stem 29a, that is, the valve element 29, separates the valve portion 29b from the valve seat 1d, and the output hole 3 and the discharge hole 4 communicate with each other.

Since the conventional solenoid valve 100 integrates the electromagnetic force generating part and the valve part for controlling the fluid, the parts cannot be used in common with solenoid valves of different designs, which has the problem of increasing the cost.

disclosure of invention

The present invention is proposed to solve the above problems, and its object is to provide a solenoid valve with a structure that can be separated into a part that generates electromagnetic force and a valve part that controls fluid, which can improve the versatility of parts and reduce the cost.

The solenoid valve of the present invention is a solenoid valve having an input hole, an output hole, and a discharge hole, and is driven by an electromagnetic device to switch the flow path, and is equipped with a cylindrical coil formed with a central hole and wound on the outer periphery. Skeleton; a casing having the above-mentioned input hole, output hole and discharge hole, arranged at one end of the above-mentioned coil bobbin; a flat plate made of magnetic material installed between the above-mentioned coil bobbin and the casing; a bottom plate with a through hole and from the bottom plate A plurality of claws protruding from the end portion of the bottom plate in a direction perpendicular to the main surface of the bottom plate, the center of the through hole coincides with the center hole of the above-mentioned coil bobbin, and is installed in a hat shape from the other end of the above-mentioned coil bobbin, and the above-mentioned claws A housing made of magnetic material that is caulked to the above-mentioned flat plate and the shell to fix the above-mentioned coil bobbin, flat plate, and shell into one body; made into a bottomed cylindrical shape, and inserted into the center of the above-mentioned coil bobbin with the bottom facing the above-mentioned flat plate In the hole, the outer peripheral surface on the side of the opening is opposite to the inner wall surface of the through hole of the above-mentioned housing and can reciprocate along the axial direction of the above-mentioned bobbin, and is attracted by the magnetic force generated when the coil is energized. A spool made of magnetic material; a sphere arranged in the above-mentioned housing to switch the flow path by the difference between the magnetic attraction force and the fluid pressure acting through the above-mentioned input hole; arranged in the above-mentioned housing and pressed by the above-mentioned flat plate The above-mentioned valve core attracted by magnetic force, the valve stem made of non-magnetic material that transmits the above-mentioned magnetic force to the ball, the engaged part is formed on the end surface of the shell side of the above-mentioned coil bobbin, and the coil bobbin side of the above-mentioned shell The engaged part is formed on the end surface of the flat plate, and the engaging part for positioning the coil bobbin and the engaging part for positioning the housing are formed on the flat plate, so that these engaging parts are engaged with the engaged parts of the coil bobbin and the housing combined to ensure the relative positional relationship between the coil bobbin and the shell.

Brief description of the drawings

1 is a cross-sectional view showing a normally closed three-way solenoid valve in a non-energized state according to Embodiment 1 of the present invention.

Fig. 2 is a cross-sectional view showing a bobbin used in a normally closed three-way solenoid valve according to Embodiment 1 of the present invention.

Fig. 3 is a perspective view showing a case of a normally closed three-way solenoid valve used in Embodiment 1 of the present invention.

Fig. 4 is a perspective view showing another example of a housing used in the normally closed three-way solenoid valve according to Embodiment 1 of the present invention.

Fig. 5 is a cross-sectional view showing a non-energized state of a normally closed three-way solenoid valve according to Embodiment 2 of the present invention.

Fig. 6 is a cross-sectional view showing a non-energized state of the normally closed three-way solenoid valve according to Embodiment 3 of the present invention.

Fig. 7 is a cross-sectional view showing a conventional normally closed three-way solenoid valve in a non-energized state.

The best way to practice the invention

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

Example 1

Fig. 1 is a sectional view showing that the normally closed three-way solenoid valve of embodiment 1 of the present invention is in a non-energized state, and Fig. 2 is a sectional view showing a coil skeleton used for the normally closed three-way solenoid valve of embodiment 1 of the present invention, Fig. 3 is a perspective view showing a housing used in the normally closed three-way solenoid valve according to Embodiment 1 of the present invention.

In Fig. 1, the shell 51 is a resin molded product, which has an input hole 52, an output hole 53 and a discharge hole 54, and is provided with O-shaped grooves 51a, 51b for installing O-rings 9, 10 on the outer peripheral portion, and is also provided with positioning The engaging hole 51c for use. The casing 51 is provided with a flow path 30 connecting the input hole 52 and the output hole 53 , and a first valve seat 51 d is provided on the side of the input hole 52 of the flow path 30 . The casing 51 is further provided with a flow path 31 communicating the output hole 53 and the discharge hole 54 . This flow path 31 is composed of a small-diameter flow path 31a and a large-diameter flow path 31b, the former having a valve stem rod described later inserted thereinto, and the latter having a valve stem resin body inserted therein. Further, a second valve seat 51e is provided on the discharge hole 54 side of the flow path 31a. In addition, in order to facilitate the flow of fluid, the diameter of the flow path 31b is made larger than the outer diameter of the resin body of the stem, and a plurality of guides for guiding the resin body are provided protruding in the circumferential direction on the inner peripheral wall surface. . The flow paths 30 and 31 provided with the first and second valve seats 51d and 51e are coaxially provided. The ball 13 is inserted into the input hole 52 of the shell 51 , and the bushing 12 is also inserted, and the shell 51 is thermally caulked to prevent the ball 13 from falling off.

The bobbin 5 is a cylindrical resin molded product in which the terminals 6 and 7 are fitted, and has a coil winding portion 5b on its outer periphery and a positioning protrusion 5c on one end surface. As shown in FIG. 2 , four guide portions 5 e for guiding the spool are provided on the inner peripheral surface of the bobbin 5 on the center hole 5 a side. A cover 63 made of resin is attached to the bobbin 5 to cover the protruding portion of the terminal 6 . A coil 12 is wound around the coil winding portion 5b, and terminals 6, 7 are electrically connected to both ends thereof.

The valve element 2 is made of a bottomed cylindrical magnetic material, and a through-hole 2a is formed through the center of the bottom. The spool 2 is arranged in the center hole 5a of the bobbin 5, and the outer peripheral surface on the bottom side is guided by the guide part 5e so that it can slide up and down.

The casing 61 is made of a magnetic material, and it is made into a bottomed cylindrical shape with a part of the side wall cut off. As shown in FIG. Two claws 61b and 61c for fixing are respectively extended and provided. The cap 59 is made of a non-magnetic material, and has a guide portion 59a having an inner diameter slightly larger than the outer diameter of the valve body 2, and a flange portion 59b extending on the outer periphery of the guide portion 59a. This cap 59 is fitted into the through hole 61a of the case 61 from the inside to be attached to the case 61 .

The valve rod 60 is a resin molded product in which a metal rod 60a is insert-molded. Both ends of the rod 60a protrude from the resin body 60b, and one end of the resin body 60b is made into an outer diameter shape that is in close contact with the second valve seat 51e, constituting the valve body. part 60c. The flat plate 55 is made of a magnetic material, and a through hole 55 a through which the valve stem 60 is inserted and a through hole 55 b through which the protrusion 5 c of the bobbin 5 is inserted are formed therethrough.

In order to assemble the solenoid valve 20 having such a structure, a flat plate 55 is assembled to the housing 51 containing the ball 13 from above. At this time, the through hole 55a of the plate 55 is aligned with the flow path 31 of the casing 51 provided with the second valve seat 51e, and the through hole 55b of the plate 55 is aligned with the engagement hole 51c of the frame 51. Then, the stem 60 is inserted into the flow path 31 through the through hole 55a. The resin body 60b of the stem 60 is accommodated in the flow path 31b, and the rod 60a protruding from the side of the resin body 60b is inserted into the flow path 31a and the flow path 30.

Next, the bobbin 5 assembled with the terminal posts 6 , 7 , the coil 12 and the spool 2 is assembled to the casing 51 from above. At this time, the protrusion 5c of the bobbin 5 is inserted into the through hole 55b of the plate 55, and fitted into the engagement hole 51c of the case 51 to position the bobbin 5, the plate 55, and the case 51. In addition, a rod 60 a protruding from the other side of the resin body 60 b of the valve stem 60 is inserted through the through hole 2 a and protrudes into the valve body 2 .

Then, the lock washer 62 is arranged on the upper part of the bobbin 5 , and the casing 61 covers the bobbin 5 from above. At this time, the opening side of the valve body 2 is accommodated in the guide portion 59a of the cap 59 . Then, while pressing the case 61 downward, the claw 61b is crimped to the case 51, and the claw 61c is crimped to the plate 55, so that the case 51, the plate 55, and the bobbin 5 are integrated. Next, the ends of the terminals 7 are welded to the housing 61 , thereby assembling the solenoid valve 20 .

In the solenoid valve 20 assembled in this way, the magnetic circuit is formed by the housing 61, the plate 55 and the valve core 2, and the two ends of the valve core 2 are guided by the guide part 5e of the bobbin 5 and the guide part 59a of the cap 59. .

A lock washer 62 is installed between the bottom of the housing 61 and the upper end of the bobbin 5 , and the reaction force generated by the elastic deformation of the lock washer 62 ensures the pressing load. However, as shown in FIG. 4, a pressing piece 61d may be provided at the bottom of the housing 61, and the pressing force may be ensured by the pressing piece 61d.

Next, the operation of the above-mentioned solenoid valve 20 will be described.

When the coil 12 is not energized, the ball 13 is seated on the first valve seat 51d by the fluid pressure acting on the input hole 52, and fluid does not flow in from the input hole 12. On the other hand, the rod 60a is pushed up by the movement of the ball 13 seated on the first valve seat 51d. As the rod 60a, that is, the resin body 60b moves upward, the valve portion 60c is separated from the second valve seat 51e, and the output hole 53 and the discharge hole 54 are communicated.

When the coil 12 is energized, the magnetic flux flows through the magnetic circuit formed by the casing 61 , the plate 55 and the valve core 2 , and the valve core 2 is attracted to the plate 55 by the magnetic force. This magnetic attraction overcomes the fluid pressure acting through the ball 13 , the valve stem 60 and the valve core 2 , so that the valve core 2 moves toward the direction of the plate 55 . As the valve body 2 moves, the valve portion 60c is seated on the second valve seat 51e, and the rod 60a of the valve rod 60 presses the ball 13, and the ball 13 is separated from the first valve seat 51d. As a result, the output hole 53 and the discharge hole 54 are blocked, and the input hole 52 and the output hole 53 are communicated.

In this way, since the first embodiment divides the solenoid valve 20 into the coil bobbin side (the part that generates the electromagnetic force) and the casing side (the valve part that controls the fluid), the parts can be commonly used for different types of solenoid valves to reduce costs. .

Since the bobbin 5 and the case 51 are integrated by caulking of the claws 61b, 61b of the case 61, assemblability is improved.

Since the flat plate 55 is installed between the bobbin 5 and the casing 51, the protrusion 5c provided on the bobbin 5 is embedded in the engagement hole 51c of the casing 51 through the through hole 55b of the flat plate 55, so that the bobbin 5 can be easily , The positioning of the housing 51 and the flat plate 55 can further improve the assembly. And because the relative positional relationship between the bobbin 5 and the housing 51 is ensured, the valve core 2 and the flow paths 30, 31 can be arranged coaxially, the valve core 2 and the valve stem 60 can move up and down smoothly, and can be stably Carry out the switching action of the valve.

Since the center hole 5a of the bobbin 5 is provided with a guide portion 5e, the cap 59 mounted on the through hole 61a at the bottom of the housing 61 is provided with a guide portion 59a, and the valve core 2 is guided by the guide portions 5e and 59a. Therefore, the spool 2 can move up and down smoothly, and the valve can be switched on and off stably.

Since the structure of the valve rod 60 is formed by embedding the metal rod 60a in the resin body 60b so that both ends protrude, the rod 60a only constitutes a collision part with the ball 13, eliminating wear and damage caused by collision with the ball 13 , to ensure durability while reducing weight. In addition, in the case where the entire valve stem is made of metal, although it is difficult to form the valve portion 60c from the viewpoint of workability, the valve portion 60c and the resin body 60b can be integrally formed during insert molding, and can be used. The valve stem 60 with the valve portion 60c is formed at low cost.

In the above-mentioned first embodiment, the protrusion 5c is provided on the bobbin 5, the through hole 55b is provided on the flat plate 55, and the engagement hole 51c is provided on the case 51, and the protrusion 5c is inserted into the engagement through the through hole 55b. In the hole 51c, the bobbin 5, the plate 55 and the housing 51 are positioned. However, the positioning mechanism is not limited to this structure, and protrusions may also be provided on the bobbin 5 and the casing 51, through holes for positioning the bobbin and through holes for positioning the casing may be provided on a flat plate, and the bobbin and the casing may be positioned on the plate. The protrusions are respectively fitted into the through holes for positioning the coil case and the through holes for positioning the case in the plate, thereby positioning the bobbin 5 , the plate 55 and the case 51 . It is also possible to provide engaging holes on the bobbin 5 and the case 51, to provide bobbin positioning protrusions and case positioning protrusions on the flat plate, and to embed the bobbin positioning protrusions and case positioning protrusions in the flat plate into the bobbin respectively. and the engagement hole of the frame, thereby positioning the coil frame 5, the flat plate 55 and the housing 51. It is also possible to provide protrusions on the coil bobbin 5, provide engaging holes on the shell 51, set the through holes for positioning the coil bobbin and the protrusions for positioning the shell on the flat plate, and embed the protrusions of the bobbin into the flat plate to position the coil shell. The protrusions for positioning the case in the plate are fitted into the engagement holes of the case through the through holes, thereby positioning the bobbin 5 , the plate 55 and the case 51 .

Example 2

Fig. 5 is a cross-sectional view showing a non-energized state of a normally closed three-way solenoid valve according to Embodiment 2 of the present invention.

In the figure, the terminal posts 6 and 7 are formed by being embedded in the bobbin 5 at the lower end side. The terminal post 6 is bent and protrudes upward from the side of the bobbin 5 . Also, a cover 63 made of resin is mounted on the bobbin 5 to cover the protruding portion of the terminal 6 welded to the flat plate 55 . Other structures are the same as in the above-mentioned embodiment 1.

Therefore, this second embodiment has the same effect as that of the above-mentioned first embodiment.

According to Embodiment 2, since the terminal 6 protrudes upward from the lower end side of the bobbin 5, the extraction direction of the terminal 6 becomes upward, which has the advantage of increasing the degree of freedom of assembly.

And because the present embodiment is divided into the bobbin side (the part that generates the electromagnetic force) and the housing side (the valve part that controls the fluid), the take-out direction of the terminal post 6 can be changed without greatly changing the structural parts.

Example 3

Fig. 6 is a cross-sectional view showing a non-energized state of the normally closed three-way solenoid valve according to Embodiment 3 of the present invention.

In the figure, the casing 51 is provided with a flow path 30 that communicates the input hole 52 and the output hole 53 , and a first valve seat 51 d is provided on the input hole 52 side of the flow path 30 . Also provided on the housing 51 is a valve seat body 32 having a flow path 31 that communicates between the output hole 53 and the discharge hole 54 . The flow path 31 is composed of a small-diameter flow path 31 a into which the rod 60 a of the valve stem 60 is inserted and a large-diameter flow path 31 b into which the resin body 60 b of the valve stem 60 is inserted. A second valve seat 51e is also provided on the output hole 53 side of the flow path 31a. In order to make the fluid flow easily, the diameter of the flow path 31b is made larger than the outer diameter of the resin body 60b of the valve stem 60, and a plurality of holes are formed protruding in the circumferential direction on the inner peripheral wall surface for guiding the resin body 60b. guides. Among them, the flow paths 30 and 31 provided with the first and second valve seats 51d and 51e are coaxially provided. Other structures with the above

Example 1 is configured in the same manner.

Next, the operation of the solenoid valve 21 will be described.

In the state where the coil 12 is not energized, the ball 13 is seated on the second valve seat 51e by the fluid pressure acting on the input hole 52, so that the input hole 52 and the output hole 53 are communicated, and the output hole 53 and the discharge hole 54 are connected. cut off. Then, the rod 60a is pushed up by the movement of the ball 13 seated on the second valve seat 51e. By the upward movement of the rod 60a, that is, the resin body 60b, the valve element 2 is guided by the guide parts 5e and 59a, and moves upward.

When the coil 12 is energized, the magnetic force flows through the magnetic circuit formed by the housing 61 , the plate 55 and the valve core 2 , and the valve core 2 is attracted to the plate 55 by the magnetic force. This magnetic attraction overcomes the fluid pressure acting through the ball 13 , the valve stem 60 and the valve core 2 , so that the valve core 2 moves toward the flat plate 55 . By the movement of the plate 2, the rod 60a of the stem 60 presses the ball 13, and the ball 13 is separated from the second valve seat 51e and seated on the first valve seat 51d. Then, the input hole 52 and the output hole 53 are blocked, and the output hole 53 and the discharge hole 54 are communicated.

Therefore, the third embodiment can also obtain the same effect as that of the first embodiment described above.

In this way, the present invention is an electromagnetic valve having an input hole, an output hole, and a discharge hole, and is driven by an electromagnetic device to switch a flow path. ; There is the above-mentioned input hole, output hole and discharge hole, and the shell is arranged at one end of the above-mentioned coil bobbin; The flat plate made of magnetic material is installed between the above-mentioned coil bobbin and the shell; A plurality of claws protruding from the end along a direction perpendicular to the main surface of the base plate are installed from the other end of the coil bobbin in a cap shape so that the center of the through hole coincides with the center hole of the coil bobbin, and the claws are closed. A housing made of magnetic material that is sewn onto the above-mentioned flat plate and the shell to fix the above-mentioned bobbin, flat plate, and shell into one body; made into a bottomed cylindrical shape, and inserted into the center hole of the above-mentioned bobbin with the bottom facing the above-mentioned flat plate The outer peripheral surface on the side of the middle and opening is opposite to the inner wall surface of the through hole of the above-mentioned housing and can reciprocate along the axial direction of the above-mentioned bobbin. A spool made of magnetic material; a sphere arranged in the above-mentioned skeleton to switch the flow path by the difference between the above-mentioned magnetic attraction force and the fluid pressure acting through the above-mentioned input hole; arranged in the above-mentioned skeleton, pressed by the above-mentioned plate magnetic force The attracted valve core transmits the magnetic force to the valve stem made of non-magnetic material. Since an engaged portion is formed on the end surface of the coil bobbin on the shell side, the coil bobbin side of the shell is formed to be engaged. The engaged part is formed on the end surface of the flat plate, and the engaging part for positioning the coil bobbin and the engaging part for positioning the housing are formed on the flat plate, so that these engaging parts are engaged with the engaged parts of the coil bobbin and the housing Therefore, the assembly performance will not be reduced due to separation into the coil bobbin side and the shell side, and the versatility of parts can be improved, and a low-cost solenoid valve can be produced.

Since the valve rod is composed of a resin body and a metal rod formed by fitting both ends of the resin body protrudingly, the durability of the valve rod can be ensured and the weight can be reduced.

Since the cap made of a non-magnetic material is fitted in the through hole of the housing in such a manner as to cover the end on the opening side of the valve core, the gap between the end on the opening side of the valve core and the housing can be increased. The magnetic resistance makes the spool magnetically attract the plate.

Since a guide portion for guiding the valve element is provided on the inner wall surface of one end side of the center hole of the bobbin, and the two ends of the valve element are guided by the guide portion and the cap respectively, it is possible to suppress The polarization of the axis of the spool during the reciprocating movement can make the spool move back and forth smoothly, and the valve can be switched on and off stably.

Claims (4)

1. a solenoid valve has input hole, delivery outlet and tap hole, is changed stream by the driving of calutron, it is characterized in that possessing:

Be formed with center hole, and with the tubular coil rack of coil winding on periphery;

Have above-mentioned input hole, delivery outlet and tap hole, be configured in the shell of above-mentioned coil rack one end;

The flat board that is contained between above-mentioned coil rack and the shell, constitutes by magnetic material;

Have the base plate that is provided with through hole and from the end of this base plate along a plurality of pawls that stretch out with the perpendicular direction of the interarea of this base plate, the center hole that makes the center of through hole and above-mentioned coil rack as one man from the other end of above-mentioned coil rack be the cap shape install, with above-mentioned pawl ca(u)lk on above-mentioned flat board and shell, make the fixedly housing that constitutes by magnetic material of all-in-one-piece of above-mentioned coil rack, flat board and shell;

Make the round-ended cylinder shape, make the bottom in the above-mentioned center hole that is inserted into above-mentioned coil rack dull and stereotypedly, the through hole internal face of the outer circumferential face of opening one side and above-mentioned housing relative to and can reciprocatingly constitute the spool that by magnetic material constitute of the magnetic attraction attraction that produces during by above-mentioned coil electricity on above-mentioned flat board along the axial direction of above-mentioned coil rack;

Be provided in the above-mentioned shell, change the spheroid of stream by the difference of above-mentioned magnetic attraction and the hydrodynamic pressure by above-mentioned input hole effect;

Be provided in the above-mentioned shell, push the above-mentioned spool that is subjected to above-mentioned dull and stereotyped magnetic attraction, above-mentioned magnetic attraction is passed to the valve rod that is made of nonmagnetic substance of spheroid,

In above-mentioned coil rack, form the portion that is stuck on the end face of skeleton one side, in above-mentioned shell, form the portion that is stuck on the end face of coil rack one side, and on above-mentioned flat board, form the engagement portion of coil rack location usefulness and the engagement portion of shell location usefulness, the portion of being stuck of these engagement portions and above-mentioned coil rack and shell is fastened, thereby guarantee the relative position relation of above-mentioned coil rack and shell.

2. solenoid valve as claimed in claim 1 is characterized in that, above-mentioned valve rod by resinite, two ends are inlaid in the above-mentioned resinite highlightedly and the metallic rod that forms constitutes.

3. solenoid valve as claimed in claim 1 is characterized in that, the cap that is made of nonmagnetic substance is that the mode with the end that covers above-mentioned valve core opening one side is inlaid on the through hole of above-mentioned housing.

4. solenoid valve as claimed in claim 3 is characterized in that, is provided with the guide portion of the above-mentioned spool of guiding on a distolateral internal face of the center hole of above-mentioned coil rack, by above-mentioned guide portion and above-mentioned cap the both end sides of above-mentioned spool is guided respectively.

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