Pilot Operated Solenoid Valve

Abstract

To provide a pilot type solenoid valve capable of being easily assembled without requiring an exclusive tool in assembling.SOLUTION: A pilot type solenoid valve has a base part that slidably receives a main valve element, a coil spring for biasing the main valve element in a direction away from a main valve seat, and a spring receiving member that is attached to the base part and supports the coil spring. The base part has a sub-valve chamber on a side opposed to the main valve chamber across the main valve element, and a pilot valve port provides communication between the sub-valve chamber and an outflow passage. The base part has a peripheral groove or a concave portion on the outer peripheral surface, and the spring receiving member has a support portion for supporting the coil spring, claw portions extending from the support portion towards the base part, and convex portions that are formed on the claw portions and engage with the peripheral groove or the concave portion.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a pilot operated solenoid valve. [Background technology]

[0002] For example, Patent Document 1 discloses a pilot-operated solenoid valve interposed between an expansion valve and an evaporator of a refrigeration cycle. In the pilot-operated solenoid valve, when the solenoid is excited, the plunger is displaced against the elastic force of the coil spring, and the auxiliary valve body opens the pilot opening of the main valve body. This generates a pressure difference between the spaces above and below the main valve body, opening the valve seat and allowing the fluid (refrigerant) to flow from the inlet hole to the outlet hole. On the other hand, when the solenoid is demagnetized, the plunger moves due to the elastic force of the coil spring, and the auxiliary valve body blocks the pilot opening of the main valve body, and the main valve body closes the valve seat, interrupting the flow of the fluid. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2000-352473 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the pilot type solenoid valve of Patent Document 1, a flange protruding in the radial direction is formed on the inner circumference of the lower end of the pipe base, and the flange is used as a locking part for locking the lower end of the coil spring. Therefore, there is no need to use a separate locking part, and the number of parts can be reduced. However, since cutting work is performed to groove the inner surface of the pipe base in order to form the flange, a dedicated tool is required and the processing is also time-consuming. In addition, since the inner diameter of the formed flange is smaller than the outer diameter of the coil spring, it is necessary to reduce the diameter of the outer diameter part of the coil spring while passing it through the inner circumference of the flange, which causes a problem of poor workability.

[0005] The present invention has been made in consideration of the above problems, and has an object to provide a pilot type solenoid valve that does not require a dedicated tool during assembly and can be easily assembled. [Means for solving the problem]

[0006] The pilot-operated solenoid valve of the present invention is a valve body including an inlet passage communicating with a main valve chamber, a main valve seat disposed within the main valve chamber, and an outlet passage; a main valve body including a pilot valve port and capable of being seated on the main valve seat around the pilot valve port; a pilot valve body capable of closing the pilot valve port; a drive unit capable of driving the pilot valve body; a base portion attached to the valve body and slidably housing the main valve element; The main valve body is biased toward a side away from the main valve seat. At least the lower end is cone-shaped A coil spring; a spring receiving member attached to the base and supporting a lower end side of the coil spring, The spring receiving member is attached to an outer circumferential surface of the base. Effect of the Invention

[0007] According to the present invention, it is possible to provide a pilot type solenoid valve that does not require a dedicated tool during assembly and can be easily installed. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a vertical sectional view of a pilot type solenoid valve according to a first embodiment. [Diagram 2] FIG. 2 is an enlarged cross-sectional view showing the periphery of an outer coil spring. [Diagram 3] 3(a) is a plan view of the spring receiving member, and FIG. 3(b) is a cross-sectional side view of the spring receiving member shown in FIG. 3(a) taken along line AA. [Figure 4] FIG. 4 is a perspective view of the spring receiving member. [Diagram 5] FIG. 5(a) is a plan view of a spring receiving member according to a modified example, and FIG. 5(b) is a sectional side view of the spring receiving member shown in FIG. 5(a) taken along line BB. [Figure 6] FIG. 6 is a perspective view of a spring receiving member according to a modified example. [Figure 7] FIG. 7(a) is a plan view of a spring receiving member according to another modified example, and FIG. 7(b) is a sectional side view of the spring receiving member shown in FIG. 7(a) taken along line CC. [Figure 8] FIG. 8 is a perspective view of a spring receiving member according to another modified example. [Figure 9] FIG. 9 is an enlarged cross-sectional view showing a portion indicated by an arrow D of the spring receiving member shown in FIG. 7(a). [Figure 10] FIG. 10 is a vertical sectional view of a pilot type solenoid valve according to the second embodiment. [Figure 11] FIG. 11 is an enlarged cross-sectional view showing the periphery of an outer coil spring according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the pilot type solenoid valve of the present invention will be described with reference to the drawings. In this specification, the term "lower" refers to the plunger side, and the term "upper" refers to the attractor side relative to the plunger.

[0010] (First embodiment) 1 is a vertical sectional view of a pilot type solenoid valve 1 according to a first embodiment.

[0011] The pilot type solenoid valve 1 has a valve body 2, a base part 4 screwed to the valve body 2, a drive part 3 attached to the valve body 2 via the base part 4, and a main valve element 5.

[0012] The valve body 2 is composed of a main body portion 20 extending in a direction perpendicular to the axis L and a hollow central cylindrical portion 21 formed coaxially with the axis L in the center of the main body portion 20, which are connected together. A high-pressure flow path (inflow path) 22 and a low-pressure flow path (outflow path) 23 are formed in the main body portion 20 and are arranged opposite each other, and a circular opening 24 is formed from the central cylindrical portion 21 toward the main body portion 20. The interior of the circular opening 24 forms a main valve chamber MC.

[0013] The inner end of high-pressure flow passage 22, to which a high-pressure pipe (not shown) is connected, communicates with the inner end of circular opening 24. The inner side of low-pressure flow passage 23, to which a low-pressure pipe (not shown) is connected, is bent in an L-shape and connected to the inside of cylindrical end 23a. Cylindrical end 23a protrudes coaxially into circular opening 24, and the upper end of cylindrical end 23a becomes main valve seat 23b.

[0014] A drive unit 3 is disposed on the valve body 2 with a base unit 4 interposed therebetween.

[0015] The drive unit 3 includes a housing 31, a winding 32a, a bobbin 32b around which the winding 32a is wound, an attractor 33 arranged inside the bobbin 32b, a set screw 34 connecting the attractor 33 and the housing 31, a thin-walled cylindrical guide sleeve 35, a plunger 36, and an inner coil spring 37. A tapered pilot valve body 36d that protrudes downward is formed at the lower end of the plunger 36. The winding 32a and the bobbin 32b form a coil, and the housing 31, the winding 32a, the bobbin 32b, and the attractor 33 form a stator of the solenoid.

[0016] The housing 31 has a dome portion 31a that is cylindrical and has a top. A disk portion 31b is disposed to cover the open lower end of the dome portion 31a. The winding 32a and the bobbin 32b are disposed to be sandwiched vertically between the top of the dome portion 31a and the disk portion 31b. The disk portion 31b has a central opening 31c. The dome portion 31a has a horizontal hole 31d, into which a wire HN is inserted via a grommet GM attached to the horizontal hole 31d, connecting the winding 32a to an external power source (not shown).

[0017] The suction element 33 is connected to the center of the bottom surface of the top of the dome portion 31a via a set screw 34. The guide sleeve 35 is inserted onto the outer periphery of the lower part of the suction element 33, end face welded (e.g., TIG welding), and extends downward through the central opening 31c. The plunger 36 is inserted into the guide sleeve 35 and is slidable in the guide sleeve 35 in the direction of the axis L.

[0018] A blind hole 36a is formed at the upper end of the plunger 36, a vertical groove 36b is formed along the entire length of the cylindrical side surface, and a communication hole 36c is formed that connects the vicinity of the bottom of the blind hole 36a to the vertical groove 36b. The inner coil spring 37 is disposed in the blind hole 36a, and biases the plunger 36 toward the valve body 2 by abutting its upper end against the lower surface of the attractor 33 and its lower end against the bottom of the blind hole 36a.

[0019] The hollow cylindrical base 4 comprises a reduced diameter section 41, an expanded diameter section 42, and a lower tubular section 43 connected together. The upper end of the reduced diameter section 41 is abutted against and fixed to the lower surface of the disk section 31b of the housing 31. The lower tubular section 43 is inserted into the circular opening 24 of the valve body 2. The base 4 is assembled to the valve body 2 by screwing a male thread 43a formed on the outer periphery of the lower tubular section 43 into a female thread 21a formed on the inner periphery of the central cylindrical section 21.

[0020] A small diameter inner circumferential portion 44 and a large diameter inner circumferential portion 45 are formed in the center of the base 4. The lower end of the guide sleeve 35 is inserted into the small diameter inner circumferential portion 44 and fixed thereto by brazing or the like. The main valve body 5 is disposed within the large diameter inner circumferential portion 45.

[0021] The main valve body 5 comprises a central valve body 51 and a hollow cylindrical peripheral valve body 52 arranged coaxially around the central valve body 51. The hollow cylindrical peripheral valve body 52 has an outer peripheral step 52a formed at the bottom and a stepped opening 52b formed on the inner circumference.

[0022] A two-stage cylindrical central valve element 51 is fitted into the stepped opening 52b. A pilot valve port 51a is formed through the central valve element 51 along the axis L, and the pilot valve element 36d is seated on the upper end of the pilot valve port 51a so as to be able to be covered. The lower surface of the central valve element 51 faces the main valve seat 23b so as to be able to be seated on it. The area radially inward of the peripheral valve element 52 and above the central valve element 51 constitutes an auxiliary valve chamber SC.

[0023] The sub-valve chamber SC communicates with the blind hole 36a and the space on the back side of the plunger 36 (the space sandwiched between the suction element 33) via a gap between the vertical groove 36b of the plunger 36 and the guide sleeve 35. This makes it possible to balance the fluid pressure on both ends of the plunger 36 sandwiched in the axial L direction.

[0024] An outer coil spring (also simply referred to as a coil spring) 53 is disposed below the main valve body 5.

[0025] 2 is an enlarged cross-sectional view showing the periphery of the outer coil spring 53. The outer coil spring 53 is a composite coil spring having a cylindrically wound portion 53a in which the wire is wound in a cylindrical shape on the upper side, and a conically wound portion 53b in which the wire is wound in a cone shape on the lower side so that the winding diameter increases downward.

[0026] The cylindrical winding portion 53a has its upper end in contact with the outer peripheral step portion 52a of the peripheral valve body 52 and extends along the outer periphery of the peripheral valve body 52. ​​The conical winding portion 53b extends along the tapered portion 46 formed at the lower end of the large-diameter inner peripheral portion 45 of the base 4 and has its lower end in contact with the spring receiving member 54.

[0027] Fig. 3(a) is a plan view of the spring receiving member 54, and Fig. 3(b) is a cross-sectional side view of the spring receiving member 54 shown in Fig. 3(a) taken along line AA. Fig. 4 is a perspective view of the spring receiving member 54.

[0028] In the figure, the spring receiving member 54, which can be formed by pressing a metal plate, has an annular portion (support portion) 54a, and three or more claw portions 54b that are connected to the outer periphery of the annular portion 54a and arranged at equal intervals in the circumferential direction. Each claw portion 54b is flat and bent relative to the annular portion 54a to extend in the axial direction (towards the lower cylindrical portion 43 when assembled), and has a hemispherical or conical protrusion 54c formed by plastic deformation near its end so as to face radially inward.

[0029] 2, a circumferential groove 43b extending in the circumferential direction is formed on the outer periphery near the lower end of the lower tubular portion 43 of the base 4. During assembly, with the main valve body 5 inserted into the base 4, the outer coil spring 53 is inserted into the annular gap between the peripheral valve body 52 and the lower tubular portion 43, and its upper end is brought into contact with the outer circumferential step portion 52a. Then, the spring receiving member 54 is brought close from below the base 4.

[0030] At this time, the lower end of the outer coil spring 53 abuts against the upper surface of the annular portion 54a of the spring receiving member 54, and the claw portion 54b abuts against the outer periphery of the lower end of the lower tubular portion 43. When the spring receiving member 54 is further raised, the convex portion 54c rides on the outer periphery of the lower tubular portion 43, and the claw portion 54b is elastically deformed so as to bend radially outward. When the spring receiving member 54 is continued to be raised, the convex portion 54c engages with the circumferential groove 43b as shown in FIG. 2, and the claw portion 54b returns from the elastic deformation, but since a part of the elastic deformation remains, the convex portion 54c is biased toward the circumferential groove 43b, and thus the spring receiving member 54 is attached to the lower tubular portion 43 and is prevented from falling off. It is preferable that the annular portion 54a is located radially outward of the main valve seat 23b. The base 4 to which the outer coil spring 53 and the spring receiving member 54 are assembled is assembled to the valve body 2 in a subsequent process.

[0031] In this way, the spring receiving member 54 can be assembled by hand with one touch without using any special tools, regardless of the phase of the claw portion 54b about the axis L relative to the lower cylindrical portion 43, thereby reducing the number of assembly steps. Also, the circumferential groove 43b of the lower cylindrical portion 43 can be formed with a general-purpose cutting tool, and the spring receiving member 54 can be formed by press molding or the like, so that it can be manufactured relatively inexpensively. The outer coil spring 53 and the spring receiving member 54 may be assembled with the base 4 upside down.

[0032] Furthermore, instead of the circumferential groove 43b, recesses may be formed at equal intervals along the circumferential direction of the lower tubular portion 43, and the same number as the protrusions 54c. In this case, during assembly, it is necessary to align the phase of the claws 54b around the axis L with the recesses of the lower tubular portion 43 and press the spring receiving member 54, but after assembly, the engagement between the recesses and the protrusions 54c suppresses relative rotation between the lower tubular portion 43 and the spring receiving member 54. This suppresses wear caused by relative sliding between them, and therefore reduces the amount of wear powder that may be mixed into the fluid passing through the pilot type solenoid valve 1.

[0033] (Pilot solenoid valve operation) 1, in the closed valve state where the central valve body 51 is urged downward by the urging force of the inner coil spring 37 and seats on the main valve seat 23b, no fluid flows through the high-pressure flow path 22 to the low-pressure flow path 23. In this closed valve state, the fluid pressure in the high-pressure flow path 22 is transmitted to the sub-valve chamber SC through the main valve chamber MC and gaps between the components, and the fluid pressure in the sub-valve chamber SC is also high, but the pressure inside the cylindrical end portion 23a is low relative to that.

[0034] When power is supplied from an external power source to the winding 32a via wiring HN from the closed valve state, the solenoid is excited and turns ON, the plunger 36 is pulled up toward the attractor 33 against the force of the inner coil spring 37, and the pilot valve body 36d separates from the main valve body 5, opening the pilot valve port 51a.

[0035] When the pilot valve port 51a opens, the fluid in the sub-valve chamber SC flows out through the pilot valve port 51a into the low-pressure flow path 23, so that the fluid pressure in the sub-valve chamber SC falls relative to the fluid pressure in the main valve chamber MC and the pressing force pressing the main valve element 5 downward decreases, so that the upward pressing force and the biasing force of the outer coil spring 53 become dominant, and the main valve element 5 rises relative to the base 4. As the main valve element 5 rises, the central valve element 51 separates from the main valve seat 23b to enter an open state, and the fluid in the main valve chamber MC flows out to the low-pressure flow path 23 through the gap between the central valve element 51 and the main valve seat 23b.

[0036] In contrast, when the power supply to the winding 32a is cut off from the open state, the excitation of the solenoid is interrupted and the state becomes OFF, so that the plunger 36 is pushed back toward the attractor 33 by the force of the inner coil spring 37, and the pilot valve body 36d approaches the main valve body 5 and seats on the pilot valve port 51a, blocking it.

[0037] When the pilot valve port 51a is blocked, the outflow of fluid from the pilot valve port 51a to the low-pressure flow path 23 stops, causing the fluid pressure in the sub-valve chest SC to increase, which in turn presses the main valve element 5 downward. As the main valve element 5 descends, the lower surface of the central valve element 51 seats on the main valve seat 23b, closing the valve, and preventing the fluid in the main valve chamber MC from flowing out to the low-pressure flow path 23 through the gap between the central valve element 51 and the main valve seat 23b.

[0038] (Variation 1) Fig. 5(a) is a plan view of a spring receiving member 54A according to a modified example, and Fig. 5(b) is a cross-sectional view of the spring receiving member 54A shown in Fig. 5(a) taken along line BB and viewed from the side. Fig. 6 is a perspective view of the spring receiving member 54A. The spring receiving member 54A can also be used in the pilot type solenoid valve 1 of the above-mentioned embodiment.

[0039] In the figure, a spring receiving member 54A, which can be formed by pressing a metal plate, has an annular portion (support portion) 54Aa and three or more claw portions 54Ab that are connected to the outer periphery of the annular portion 54Aa and arranged at equal intervals in the circumferential direction. Each claw portion 54Ab is bent relative to the annular portion 54Aa and extends in the axial direction, and has a hemispherical protrusion 54Ac facing radially inward near the end. The claw portions 54Ab and the protrusion 54Ac have the same configuration as in the above-mentioned embodiment.

[0040] Furthermore, the annular portion 54Aa has a spring piece 54Ad at a middle position between the claw portions 54Ab adjacent in the circumferential direction. At least three or more spring pieces 54Ad can be formed in a cantilever shape extending in a direction along the outer periphery of the annular portion 54Aa by cutting a part of the outer periphery of the annular portion 54Aa into an L-shaped slit shape. One end of the spring piece 54Ad is connected to the annular portion 54Aa, and the other end (tip) is raised from the upper surface of the annular portion 54Aa. It is preferable that the tip of the spring piece 54Ad is formed in a semicircular shape to prevent damage to the mating part.

[0041] 2, when the spring receiving member 54A is attached to the lower tubular portion 43 by engaging the protrusion 54Ac with the circumferential groove 43b, the spring piece 54Ad abuts against the lower end of the lower tubular portion 43 and elastically deforms. The spring piece 54Ad is urged downward by the elastic deformation of the spring piece 54Ad, and the protrusion 54Ac is pressed toward the lower edge of the circumferential groove 43b and fixed. In this way, by increasing the abutment portion of the spring receiving member 54A against the lower tubular portion 43, rattling of the protrusion 54Ac against the circumferential groove 43b is suppressed. The same applies when a recess is provided in the lower tubular portion 43 instead of the circumferential groove 43b and the protrusion 54Ac is engaged therein.

[0042] (Variation 2) Fig. 7(a) is a plan view of a spring receiving member 54B according to another modified example, and Fig. 7(b) is a cross-sectional view of the spring receiving member 54B shown in Fig. 7(a) cut along line CC and viewed from the side. Fig. 8 is a perspective view of the spring receiving member 54B. Fig. 9 is an enlarged cross-sectional view of a portion indicated by arrow D of the spring receiving member 54B shown in Fig. 7(a). The spring receiving member 54B can also be used in the pilot type solenoid valve 1 of the above-mentioned embodiment.

[0043] In the drawing, the spring receiving member 54B, which can be formed by pressing a metal plate, has an annular portion (support portion) 54Ba and three or more claw portions 54Bb that are connected to the outer periphery of the annular portion 54Ba and arranged at equal intervals in the circumferential direction. Each of the claw portions 54Bb is bent relative to the annular portion 54Ba and extends in the axial direction.

[0044] Each claw portion 54Bb is sheared from its upper end toward the annular portion 54Ba to form a plurality of (here, two) slits 54Bc in parallel. By forming the slits 54Bc, the upper end side of the claw portion 54Bb is divided into a central claw 54Bd and a pair of side claws 54Be arranged on both sides of the central claw 54Bd. Therefore, the central claw 54Bd can extend in a direction different from the side claws 54Be, while the side claws 54Be extend in the same direction as the lower side of the claw portion 54Bb. Here, as shown in FIG. 9, the central claw 54Bd is curved so as to protrude toward the radial inside of the annular portion 54Ba relative to the side claws 54Be. At this time, it is preferable that the radially inner edge at the upper end of the central claw 54Bd is radially outer than the radially inner edge at the upper end of the side claws 54Be, thereby making it possible to avoid interference with the lower tube portion 43 during assembly. The protruding portion of the central claw 54Bd constitutes a convex portion.

[0045] 2, the spring receiving member 54B can be attached to the lower tubular portion 43 by engaging the central claw 54Bd with the circumferential groove 43b. In this modification, only the central claw 54Bd can be engaged with the circumferential groove 43b while the side claws 54Be are in contact with the outer periphery of the lower tubular portion 43, so that the holding force of the spring receiving member 54B can be further increased. The same applies when a recess is provided in the lower tubular portion 43 instead of the circumferential groove 43b and the central claw 54Bd is engaged therein.

[0046] Second embodiment Fig. 10 is a vertical cross-sectional view of a pilot type solenoid valve 1C according to the second embodiment, Fig. 11 is an enlarged cross-sectional view of the outer coil spring 53 and its periphery.

[0047] The pilot type solenoid valve 1C of this embodiment differs from the first embodiment in the shapes of a valve body 2C, a base 4C, and a spring receiving member 54C. The rest of the configuration is the same as in the above-mentioned embodiment, so the same reference numerals are used and the repeated explanation is omitted.

[0048] The valve body 2C is formed by connecting a main body portion 20C extending in a direction perpendicular to the axis L to a hollow central cylindrical portion 21C formed in the center of the main body portion 20C and coaxially with the axis L. In this embodiment, the base portion 4C is attached to the valve body 2C by fitting an expanded diameter portion 42C connected to a reduced diameter portion 41C of the base portion 4C into the central cylindrical portion 21C, and crimping a crimped portion 21Ca at the upper end of the central cylindrical portion 21C radially inward to cause plastic deformation.

[0049] The lower cylindrical portion 43C of the base 4C has a shape in which the lower end side is cut away compared to the first embodiment, and accordingly, the circumferential groove 43Cb is formed on the outer periphery of the lower cylindrical portion 43C at a position shifted upward. In response to the circumferential groove 43Cb being shifted upward, the claw portion 54Cb of the spring receiving member 54C is extended upward.

[0050] As shown in FIG. 11, the spring receiving member 54C can be attached to the lower cylindrical portion 43C by engaging the protruding portion 54Cc with the circumferential groove 43Cb. In this case, the annular portion (supporting portion) 54Ca is disposed in the same position as in the first embodiment, so that the overall length of the outer coil spring 53, the lower end of which is supported by the annular portion 54Ca, does not change, and the urging force of the outer coil spring 53 can be maintained. According to this embodiment, the lower cylindrical portion 43C can be made smaller and lighter than in the first embodiment. For example, when the pilot type solenoid valve 1C is used for vehicle mounting, the vehicle can be made lighter. In addition, the use of the spring receiving member 54B reduces the volume of the lower cylindrical portion 43C that protrudes into the valve chamber, and the valve chamber capacity is expanded, which has the effect of reducing pressure loss.

[0051] In the above-described embodiment, the pilot valve body and the plunger are integrated together, but the pilot valve body and the plunger may be separate bodies. [Explanation of symbols]

[0052] 1, 1C Pilot operated solenoid valve 2, 2C valve body 20, 20C main body 21Ca Crimping part 21 Central cylindrical section 22 High pressure flow path 23 Low pressure flow path 23b Main valve seat 3 Drive unit 31 Housing 32a winding 32b Bobbin 33 Attractor 34 Setscrew 35 Guide sleeve 36 Plunger 36d Pilot valve body 4, 4C base 41 Reduced diameter part 42 Expanded diameter part 43 Lower cylinder part 43b Circumferential groove 5 Main valve body 51 Central valve body 51a Pilot valve port 52 Peripheral valve body 53 Outer coil spring 53a Cylindrical winding section 53b Cone winding section 54, 54A, 54B, 54C Spring receiving member 54a, 54Aa, 54Ba, 54Ca ring 54b, 54Ab, 54Bb, 54Cb Claw part 54c, 54Ac, 54Cc convex part 54Ad Spring piece 54Bc Slit 54Bd central claw 54Be Side Claw MC main valve chamber

Claims

1. a valve body including an inlet passage communicating with a main valve chamber, a main valve seat disposed within the main valve chamber, and an outlet passage; a main valve body including a pilot valve port and capable of being seated on the main valve seat around the pilot valve port; a pilot valve body capable of closing the pilot valve port; a drive unit capable of driving the pilot valve body; a base portion attached to the valve body and slidably housing the main valve element; a coil spring having at least a conical lower end which biases the main valve body away from the main valve seat; a spring receiving member attached to the base and supporting a lower end side of the coil spring, 4. A pilot type solenoid valve, comprising: a base portion having a spring receiving member attached to an outer circumferential surface of the base portion;

2. The base portion has a circumferential groove or a recess on an outer circumferential surface, 2. The pilot type solenoid valve according to claim 1, wherein the spring receiving member has a support portion that supports the coil spring, a claw portion that extends from the support portion toward the base portion, and a convex portion that is formed on the claw portion and engages with the circumferential groove or the concave portion.

3. The support portion is an annular portion located radially outward of the main valve seat.

3. The pilot operated solenoid valve according to claim 2.

4. The annular portion has a spring piece that abuts against the base portion and applies a biasing force in the axial direction.

4. The pilot-operated solenoid valve according to claim 3.

5. The claw portion is flat, and the protrusion is formed in a hemispherical or conical shape so as to face radially inward of the annular portion.

4. The pilot-operated solenoid valve according to claim 3.

6. By forming a plurality of slits at the end of the claw portion, the extending direction of a part of the claw portion can be changed with respect to the extending direction of the rest of the claw portion, and the convex portion is formed by bending a part of the claw portion into a curved shape.

4. The pilot-operated solenoid valve according to claim 3.

7. The base is attached to the valve body by threaded engagement.

7. The pilot type solenoid valve according to claim 1,

8. The base is attached to the valve body by crimping a portion of the valve body.

7. The pilot type solenoid valve according to claim 1,

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