JP2011214596A - Control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve degrees of freedom of design of each valve in regard to a control valve composed by integrally attaching a pilot operation type main valve and an auxiliary valve different from the main valve.SOLUTION: In one embodiment, at least one part of the main valve 6 and the auxiliary valve 8 are attached to a second body 14 made of resin to compose a unitized valve unit, and the valve unit is incorporated into a first body 12 to compose the control valve 1. Thereby, shapes, sizes, and positions of the main valve 6 and the auxiliary valve 8 can be comparatively freely set independently in a valve unit side aside from the first body 12 having restrictions in a connection structure with external piping or the like.

Description

  The present invention relates to a control valve provided at a branch point of a refrigerant circulation passage in a refrigeration cycle and capable of changing a ratio of a refrigerant flow rate flowing from an upstream passage to each downstream branch passage.

  Generally, an air conditioner for an automobile is configured by arranging a compressor, a condenser, an evaporator, and the like in a refrigerant circulation passage (see, for example, Patent Document 1). For example, a branch point between a passage through which the refrigerant passes and a passage through which the refrigerant passes is provided between the compressor and the condenser. The air conditioning control is performed by changing the state (temperature) of the refrigerant sent to the evaporator by forming a passage mainly for passing the condenser during the cooling operation and mainly forming a passage for bypassing the condenser during the heating operation. ing. In order to perform such control, a switching valve for switching the refrigerant flow between the cooling operation and the heating operation is provided at the branch point.

  In the air conditioner described in Patent Document 1, such a switching valve is configured as a composite valve in which an electromagnetic valve portion and a differential pressure valve portion are integrally provided in one valve body, thereby reducing processing costs, and the like. Is realized. Further, the main valve that is opened and closed by the electromagnetic valve portion is of a pilot operated type, thereby realizing a compact composite valve.

JP 2004-340560 A

  However, when configuring such a composite valve, the main valve body constituting the main valve, the pilot valve body constituting the pilot valve, and the differential pressure valve body constituting the differential pressure valve must be incorporated in the body of one valve body. In addition, a valve seat to be attached to and detached from each valve body must be provided. For this reason, when cutting the body, the shape and dimensions of the internal passage are restricted so that each valve body can be incorporated. In other words, the body will be provided with a plurality of ports connected to the refrigerant circulation passage and a plurality of internal passages connecting them, but in order to accommodate the valve body inside, ensure a size capable of accommodating it. There must be. In other words, depending on the shape and size of the body or the position of the port, there is a problem that restrictions are imposed on the size and arrangement of the valve body.

  The present invention has been made in view of such problems, and in a control valve configured by integrally assembling a pilot-actuated main valve and another sub-valve, the degree of freedom in design of each valve is improved. The purpose is to let you.

  An aspect of the present invention is a pilot-actuated type that is provided between an upstream passage, a first downstream passage, and a second downstream passage, and that can control a ratio of a refrigerant flow rate flowing from the upstream passage to each downstream passage. Control valve. The control valve has an introduction port connected to the upstream passage, a first derivation port connected to the first downstream passage, and a second derivation port connected to the second downstream passage, and the introduction port and the first derivation port The first passage is opened and closed by contact with and separating from the main valve hole provided in the first passage and the body formed with the first passage connecting the first passage and the second passage connecting the introduction port and the second outlet port. The main valve body opens and closes the second passage by coming into contact with and separating from the main valve that partitions the first passage and the back pressure chamber, and the sub-valve hole provided in the second passage. A sub-valve having a sub-valve body, a pilot valve hole communicating the back pressure chamber and the first downstream passage, and a third passage connecting the upstream passage and the first downstream passage via the back pressure chamber Electromagnetically operated pilots having a pilot valve body that opens and closes by contacting and separating the pilot valve hole It includes a valve, a. Further, the body is configured by inserting and fitting a resin second body provided with a communication hole to each port into a metal first body in which each port is formed. And the valve unit comprised by assembling | attaching at least one part of a main valve and a subvalve to the 2nd body is assembled | attached so that it may insert from the end of the fitting hole provided in the 1st body. Here, “controlling the ratio of the refrigerant flow rate” may be one that changes the ratio of the refrigerant flow rate, or may switch the refrigerant flow itself.

  According to this aspect, the body has a double structure of the first body and the second body, the first body made of metal is arranged outside, and a connection port is formed between the upstream side passage and the downstream side passage. Has been. For this reason, sufficient rigidity is ensured as the whole control valve including a connection part with piping etc. which form an upstream passage and a downstream passage. On the other hand, a valve unit is formed by assembling at least a part of the main valve and the sub-valve into the second body made of resin, and the control unit is configured by incorporating the valve unit into the first body. . For this reason, apart from the first body, which has restrictions on the connection structure with external piping, etc., the shape, dimensions, position, etc. of the main valve and subvalve can be set relatively freely independently on the valve unit side. The degree of freedom in designing each valve is improved.

  ADVANTAGE OF THE INVENTION According to this invention, the design freedom degree of each valve can be improved in the control valve comprised by integrally integrating a pilot-actuated main valve and a sub valve different from it.

It is sectional drawing showing the structure of the control valve of embodiment. It is explanatory drawing showing the operation state of a control valve. It is explanatory drawing showing the outline of the manufacturing process of a control valve. It is explanatory drawing showing the outline of the manufacturing process of a control valve. It is explanatory drawing showing the outline of the manufacturing process of a control valve.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, for the sake of convenience, the positional relationship may be expressed based on the illustrated state.
Drawing 1 is a sectional view showing composition of a control valve of an embodiment.
The control valve 1 of the present embodiment is provided as a switching valve that is provided at a branch point of the refrigerant circulation passage of the automotive air conditioner and changes the ratio of the refrigerant flow rate flowing from the upstream passage to the downstream branch passages. . This automobile air conditioner is configured by connecting a receiver, an accumulator, and the like in addition to a compressor, a condenser, and an evaporator.

  The refrigerant circulation path includes a first circulation path through which the refrigerant circulates between the compressor, the condenser, the receiver, the evaporator, the evaporator, the accumulator, and the compressor, the branch point between the compressor and the condenser, and the receiver. And a bypass passage connecting the junction between the evaporator and the evaporator. The bypass passage constitutes a second circulation passage that circulates from the compressor → the evaporator → the accumulator → the compressor. The control valve 1 is provided at a branch point between the compressor and the condenser, and switches the refrigerant flow between the cooling operation and the heating operation. That is, the control valve 1 guides the refrigerant introduced from the upstream passage connected to the compressor to either the first downstream passage connected to the condenser or the second downstream passage bypassing the condenser, and the upstream thereof. The ratio of the refrigerant flow rate flowing from the side passage to each downstream passage can be controlled. Since such a refrigeration cycle itself is known as disclosed in Patent Document 1, detailed description thereof is omitted.

  As shown in FIG. 1, the control valve 1 is configured by assembling a valve body 2 in which a valve mechanism is housed and a solenoid 4 that drives the valve mechanism. The body 5 of the valve body 2 includes a main valve 6 that controls the flow of refrigerant flowing from the upstream passage to the first downstream passage, and a sub-valve that controls the flow of refrigerant flowing from the upstream passage to the second downstream passage. 8 and a pilot valve 10 for controlling the open / closed state of the main valve 6 are incorporated.

  The body 5 is configured by fitting a resin-made second body 14 coaxially with a metal-made first body 12. The first body 12 has a fitting hole 16 that vertically penetrates the rectangular parallelepiped body, and the fitting hole 16 forms an attachment hole for the second body 14. One side surface of the first body 12 is provided with an introduction port 20 that communicates the inside and outside of the first body 12 and communicates with the upstream passage, and a lead-out port 22 (“ Corresponding to “second derivation port”). The opposite side surface of the first body 12 is provided with a derivation port 24 (corresponding to a “first derivation port”) communicating with the inside and outside of the first body 12 and connected to the first downstream passage.

  The second body 14 is configured by fitting a first valve forming portion 26 that forms a main body inserted into the first body 12 and a second valve forming portion 28 that is incorporated in the first valve forming portion 26. The The first valve forming portion 26 has a double pipe structure coaxial with the first body 12 in the upper half thereof, and the lower half serves as a housing portion for the second valve forming portion 28. The inner pipe portion 30 of the double pipe structure has a main valve hole 32 formed therein, and a main valve seat 34 is formed by the opening end portion thereof. In addition, a communication hole 36 for communicating the inside and the outside is formed on the surface of the outer tube portion 35 of the double tube structure facing the introduction port 20. An upstream pressure chamber 38 is formed between the inner tube portion 30 and the outer tube portion 35. A bottomed cylindrical main valve body 40 is disposed in the pressure chamber 38. The main valve body 40 opens and closes the main valve 6 by being attached to and detached from the main valve seat 34.

  The main valve body 40 is supported by a flexible diaphragm 42 sandwiched between the first valve forming portion 26 and the solenoid 4. A plurality of leg portions 44 (one of which is shown in the figure) are extended downward from the lower surface of the main valve body 40. Since the leg portion 44 is slidably inserted into the inner tube portion 30, a stable opening / closing operation in the axial direction of the main valve body 40 is ensured. The diaphragm 42 is mounted such that the center portion is sandwiched between the bottom portion of the main valve body 40 and the leg portion 44, and a thick portion along the bottom portion is attached to and detached from the main valve seat 34. 40 is a part. The main valve body 40 divides the pressure chamber 38 into a high pressure chamber 46 and a back pressure chamber 48. The main valve body 40 is provided with an orifice 50 that communicates the high pressure chamber 46 and the back pressure chamber 48. The upper end opening edge of the main valve body 40 is provided with a plurality of slits 51 for communicating the inside and the outside. Even if the main valve body 40 is located at the top dead center where the main valve body 40 is fully opened as shown in the drawing, The pressure is applied to the back portion of the diaphragm 42.

  A boss portion 52 that protrudes toward the back pressure chamber 48 is provided at the bottom center of the main valve body 40, and a pilot valve seat 54 is formed by the upper end surface of the boss portion 52. A pilot valve hole 56 is formed so as to penetrate the boss portion 52 in the axial direction. The back pressure chamber 48 is provided with a pilot valve body 60 driven by the solenoid 4. The pilot valve body 60 is attached to and detached from the pilot valve seat 54 to open and close the pilot valve 10. The pilot valve body 60 has an attachment / detachment portion 62 made of an elastic body (rubber in this embodiment) fitted to a lower end portion of a long main body, and a rod portion 64 extending to the opposite side of the attachment / detachment portion 62 is a solenoid 4. It is connected to.

  A communication hole 70 that communicates the inside and the outside is formed on the surface of the lower half of the first valve forming portion 26 that faces the outlet port 22. A valve seat forming portion 72 that protrudes in a cylindrical shape is provided inside the communication hole 70. A sub valve hole 74 is formed inside the valve seat forming portion 72, and a sub valve seat 76 is formed by the opening end portion thereof. A bottomed cylindrical subvalve element 78 is provided so as to face the subvalve seat 76. The sub-valve body 78 opens and closes the sub-valve 8 with its bottom attached to and detached from the sub-valve seat 76.

  The auxiliary valve body 78 is supported by a flexible diaphragm 80 that is sandwiched between the first valve forming portion 26 and the second valve forming portion 28. The sub valve body 78 is slidably supported along the right end opening of the second valve forming portion 28, so that a stable opening / closing operation in the axial direction of the sub valve body 78 is secured. As shown in the figure, the axis of the sub-valve 78 forms an angle of 90 degrees with the axis of the main valve 40. That is, the auxiliary valve body 78 opens and closes in a direction perpendicular to the opening and closing direction of the main valve body 40. The center portion of the diaphragm 80 is fitted to the bottom portion of the sub-valve body 78, and the thick portion along the bottom portion constitutes a part of the sub-valve body 78 that is attached to and detached from the sub-valve seat 76. The sub valve body 78 divides the interior of the body 5 into a high pressure chamber 46 that communicates with the introduction port 20, a low pressure chamber 82 that communicates with the outlet port 22, and a low pressure chamber 84 that communicates with the outlet port 24.

  Further, a cylindrical seal member 92 is fitted so as to straddle the connection portion between the communication hole 70 and the outlet port 22. A sealing O-ring 94 is externally fitted on the joint surface with the first body 12 at the center of the first valve forming portion 26, and the joint with the first valve forming portion 26 is provided on the outer peripheral surface of the seal member 92. A sealing O-ring 96 is fitted on the surface. Thereby, the refrigerant in the high pressure chamber 46 is prevented from leaking to the outlet port 22 side through the gap between the first body 12 and the first valve forming portion 26. Also, a sealing O-ring 98 is externally fitted to the joint surface with the first body 12 at the lower end of the first valve forming portion 26. Further, a disc-shaped sealing member 100 is provided so as to seal the lower end opening of the first body 12.

  The second valve forming portion 28 has a cylindrical main body, and is fitted so as to be inserted from a fitting hole 102 provided on the opposite side of the communication hole 70 in the lower half portion of the first valve forming portion 26. Has been. A communication hole 104 for communicating the main valve hole 32 and the low pressure chamber 84 is provided at a side portion of the second valve forming portion 28. An inwardly extending spring receiving portion 106 is provided at the central portion in the axial direction of the second valve forming portion 28. Between the spring receiving portion 106 and the sub valve body 78, a spring 108 for biasing the sub valve body 78 in the valve closing direction is interposed.

  On the other hand, the solenoid 4 is attached so as to seal the upper end opening of the body 5. The solenoid 4 is disposed so as to face the core 120 in the axial direction in the sleeve 120 having a core 120 connected to the body 5, a bottomed cylindrical sleeve 122 that accommodates the upper half of the core 120 so as to be fixed. Plunger 124, bobbin 126 fitted to sleeve 122, electromagnetic coil 128 wound around bobbin 126, and case 130 assembled to core 120 so as to cover electromagnetic coil 128 from the outside. It consists of

  The pilot valve body 60 has its rod portion 64 penetrating the core 120 and fitted into the plunger 124, and operates integrally with the plunger 124. A spring 132 (corresponding to an “urging member”) that biases the pilot valve body 60 in the valve opening direction via the plunger 124 is interposed between the core 120 and the plunger 124. A sealing O-ring 134 is interposed between the case 130 and the body 5. A current-carrying harness 138 is drawn out from the electromagnetic coil 128 through the rubber bush 140. The plunger 124 has a cylindrical shape, and a communication path 142 is formed along the axial direction thereof. The communication path 142 communicates with a back pressure chamber 144 formed on the bottom side in the sleeve 122.

  In such a configuration, in the body 5, a passage connecting the high pressure chamber 46 and the low pressure chamber 84 via the main valve 6 constitutes a “first passage”, and the high pressure chamber 46 and the low pressure chamber 82 are connected to the auxiliary valve 8. A passage that connects the high pressure chamber 46, the back pressure chamber 48, and the low pressure chamber 84 via the pilot valve 10 forms a "third passage". The pressure P1 in the high-pressure chamber 46 (referred to as “upstream pressure P1”) becomes an intermediate pressure Pp in the back pressure chamber 48 by passing through the orifice 50, while being reduced in pressure through the main valve 6 and pressure P2 (“downstream Side pressure P2 "). The intermediate pressure Pp varies depending on the open / close state of the pilot valve 10. Further, the upstream pressure P1 is reduced through the auxiliary valve 8 to become a pressure P3 (referred to as “downstream pressure P3”).

Next, the operation of the control valve of this embodiment will be described.
FIG. 2 is an explanatory diagram showing the operating state of the control valve. FIG. 2 shows a differential pressure control state in which the solenoid 4 is turned on. Note that FIG. 1 described above shows a state in which the solenoid 4 is turned off.

  As shown in FIG. 1, when the solenoid 4 is turned off (non-energized state), in the control valve 1, the main valve 6 opens to open the first passage, while the sub valve 8 closes. And operate to close the second passage. That is, since the solenoid force does not act, the pilot valve body 60 is biased in the valve opening direction by the spring 132, and the pilot valve 10 is opened. At this time, the intermediate pressure Pp in the back pressure chamber 48 and the downstream pressure P2 in the low pressure chamber 84 are substantially equal, while a predetermined differential pressure (P1-Pp) is generated between the upstream pressure P1 and the intermediate pressure Pp. Therefore, the main valve body 40 is pushed up to the fully open position as shown in the figure. However, since the top dead center of the main valve body 40 is regulated by the upper end portion of the main valve body 40 being locked to the core 120, the pilot valve 10 is maintained in an open state.

  On the other hand, since the main valve 6 is fully open, the differential pressure (P1-P2) between the upstream pressure P1 and the downstream pressure P2 is small, and the sub valve body 78 is pressed against the sub valve seat 76 by the biasing force of the spring 108. Thus, the auxiliary valve 8 is closed. That is, when the solenoid 4 is off, the first passage connecting the introduction port 20 and the derivation port 24 is opened, while the second passage connecting the introduction port 20 and the derivation port 22 is closed.

  On the other hand, as shown in FIG. 2, when the solenoid 4 is turned on (energized state), in the control valve 1, the main valve 6 is closed and the first passage is closed, while the sub valve 8 is opened. And operate to open the second passage. That is, since the solenoid force acts, the pilot valve body 60 is driven in the valve closing direction against the urging force of the spring 132, and the pilot valve 10 is closed. At this time, the intermediate pressure Pp of the back pressure chamber 48 and the upstream pressure P1 of the high pressure chamber 46 are substantially equal, while a predetermined differential pressure (Pp−P2) is generated between the intermediate pressure Pp and the main valve. The body 40 is pushed down to the closed position as shown. At this time, the closed state of the pilot valve 10 is also maintained.

  As a result, the upstream pressure P1 of the high-pressure chamber 46 increases, the differential pressure (P1-P2) between the upstream pressure P1 and the downstream pressure P2 increases, and the sub-valve body resists the biasing force of the spring 108. 78 is driven in the valve opening direction, and the auxiliary valve 8 is opened. That is, when the solenoid 4 is turned on, the first passage connecting the introduction port 20 and the derivation port 24 is closed, while the second passage connecting the introduction port 20 and the derivation port 22 is opened.

  During the cooling operation, the solenoid 4 is turned off as shown in FIG. For this reason, when the refrigerant from the compressor is introduced through the introduction port 20, it is led out from the lead-out port 24 through the first passage and led to the condenser. That is, the 1st circulation path which passes a condenser as a refrigerant circulation path of a refrigerating cycle comes to be constituted. On the other hand, during the heating operation, the solenoid 4 is turned on as shown in FIG. For this reason, when the refrigerant from the compressor is introduced through the introduction port 20, it is led out from the lead-out port 22 through the second passage and led to the bypass passage. That is, a second circulation path that bypasses the condenser is configured as the refrigerant circulation path of the refrigeration cycle.

Next, a method for manufacturing the control valve 1 will be described.
The control valve 1 configured as described above is manufactured by molding the first body 12 and the second body 14 individually and assembling them later. The second body 14 is configured in advance as a valve unit incorporating the main valve 6 and the subvalve 8 and is assembled to the first body 12. Hereinafter, a method for manufacturing such a control valve will be described.

  3-5 is explanatory drawing showing the outline of the manufacturing process of a control valve. FIG. 3 shows a manufacturing process of the first body 12, (A) shows a state after the hollow extrusion process, and (B) shows a state after drilling. The upper part of each figure shows a front view of the body, and the lower part shows a cross-sectional view taken along the line AA. FIG. 4 shows a manufacturing process of the valve unit including the second body 14, wherein (A) shows a state before the valve unit is assembled, and (B) shows a state after the valve unit is assembled. Furthermore, FIG. 5 shows the assembly process of the entire control valve.

  In the manufacturing process of the first body 12, a hollow extrusion apparatus (not shown) is used. First, the base member 150 shown in FIG. That is, the outer shape of the first body 12 is formed by extruding a metal billet using a hollow extrusion processing apparatus in which a predetermined mold and a mandrel (not shown) are arranged. At this time, the lower hole 152 of the fitting hole 16 extending in the pushing direction in the first body 12 is formed with a cross section that is a predetermined amount smaller than the fitting hole 16. The long member obtained through this extrusion process is cut in a direction perpendicular to the longitudinal direction to obtain the illustrated base member 150 (extrusion process).

  Thereafter, the tool cutting edge of the rotary cutting tool is inserted into the lower hole 152 in the base member 150 so that the center axis of the lower hole 152 becomes the center of rotation, and the inner peripheral surface of the lower hole 152 is cut by the cutting edge. The fitting hole 16 is formed. Further, the introduction port 20, the lead-out port 22 and the lead-out port 24 are formed by cutting a hole having a predetermined shape at a predetermined position on the side surface of the base member 150 (cutting process). In this way, the first body 12 shown in FIG. 3B is obtained.

  On the other hand, as shown to FIG. 4 (A), the 1st valve formation part 26 and the 2nd valve formation part 28 are shape | molded, respectively. An injection molding device (not shown) is used for molding these valve forming portions. That is, each of the first valve forming part 26 and the second valve forming part 28 is molded by extruding a resin material using an injection molding apparatus in which a predetermined mold (not shown) is arranged. The spring 108, the sub-valve element 78, and the diaphragm 80 are assembled to the second valve forming portion 28 formed in this way, and further inserted and fitted into the fitting hole 102 of the first valve forming portion 26, whereby FIG. A valve unit 160 shown in FIG. An O-ring 94 is fitted on the outer peripheral surface of the first valve forming portion 26.

  Then, as shown in FIG. 5, the sealing member 100 and the valve unit 160 are assembled to the first body 12 so as to be inserted from one end side of the fitting hole 16, and the sealing member 100 is attached to the other end of the fitting hole 16. The first body 12 is assembled and assembled so as to be inserted from the side. On the other hand, a pilot valve body 60, a main valve body 40, and a diaphragm 42 are assembled to the solenoid 4. Thereafter, the solenoid 4 is assembled so that the O-ring 134 is interposed between the first body 12 and the seal member 92 is inserted into the outlet port 22 and assembled. In this way, the assembly of the control valve 1 is completed.

  As described above, in the present embodiment, the valve unit 160 is configured by assembling at least a part of the main valve 6 and the sub-valve 8 into the second body 14 made of resin, and the valve unit 160 is configured as a unit. The control valve 1 is configured by being incorporated in the first body 12. For this reason, apart from the first body 12 having a limited connection structure with external piping, the shape, size, position, etc. of the main valve 6 and sub-valve 8 can be set relatively freely independently on the valve unit 160 side. can do. Specifically, as shown in FIG. 1, the sub-valve element 78 and its operating mechanism can be configured larger than the outlet ports 22 and 24, and the degree of freedom in designing each valve is improved.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the specific embodiments, and various modifications can be made within the scope of the technical idea of the present invention. Nor.

  In the above embodiment, the main valve body 40 and the diaphragm 42 are assembled in advance on the solenoid 4 side, and this is assembled to the first body 12. However, the main valve body 40 and the diaphragm 42 are not pre-solenoid 4 but the second body. 14 and the solenoid 4 may be assembled thereto. Alternatively, an electromagnetic valve unit in which the solenoid 4, the main valve body 40, the diaphragm 42, and the second body 14 are assembled in advance may be assembled to the first body 12.

  DESCRIPTION OF SYMBOLS 1 Control valve, 2 Valve body, 4 Solenoid, 5 Body, 6 Main valve, 8 Sub valve, 10 Pilot valve, 12 1st body, 14 2nd body, 16 Fitting hole, 20 Introducing port, 22, 24 Deriving port , 26 1st valve formation part, 28 2nd valve formation part, 32 Main valve hole, 34 Main valve seat, 40 Main valve body, 42 Diaphragm, 46 High pressure chamber, 48 Back pressure chamber, 50 Orifice, 54 Pilot valve seat, 56 Pilot valve hole, 60 Pilot valve body, 74 Sub valve hole, 76 Sub valve seat, 78 Sub valve body, 80 Diaphragm, 82, 84 Low pressure chamber, 92 Seal member, 102 Fitting hole, 150 Base member, 152 Lower hole 160 Valve unit.

Claims (4)

In a pilot operated control valve that is provided between the upstream side passage, the first downstream side passage, and the second downstream side passage and that can control the ratio of the refrigerant flow rate flowing from the upstream side passage to each downstream side passage,
An introduction port connected to the upstream passage; a first derivation port connected to the first downstream passage; and a second derivation port connected to the second downstream passage; the introduction port and the first derivation port A body formed with a first passage that connects the first passage and a second passage that connects the introduction port and the second outlet port;
A main valve body that opens and closes the first passage by contacting and separating from a main valve hole provided in the first passage, and the main valve body partitions the first passage and the back pressure chamber. When,
A sub-valve having a sub-valve element that opens and closes the second passage by coming into contact with and separating from the sub-valve hole provided in the second passage;
A pilot valve hole communicating the back pressure chamber and the first downstream passage, and a third passage connecting the upstream passage and the first downstream passage via the back pressure chamber; An electromagnetically driven pilot valve having a pilot valve body that opens and closes by contacting and leaving the valve hole;
With
The body is configured by inserting and fitting a resin-made second body provided with a communication hole to each port into a metal first body in which each port is formed,
A valve unit configured by assembling at least a part of the main valve and the sub valve to the second body is assembled so as to be inserted from one end of a fitting hole provided in the first body. A control valve characterized by that.   The control valve according to claim 1, wherein the first body is obtained by hollow extrusion.   In the second body, a main valve forming portion having a portion forming the main valve and a sub valve forming portion having a portion forming the sub valve are individually formed, and the main valve forming portion and the sub valve are formed. The control valve according to claim 1, wherein the control valve is obtained by fitting a forming portion.   The said 2nd body is assembled | attached and comprised so that the said subvalve formation part may be inserted from the fitting hole formed in the side part of the said main valve formation part, The structure of Claim 3 characterized by the above-mentioned. Control valve.

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