JP2016040477A - Control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress occurrence of distortion causing fluid leakage on a surface facing a valve seat in a valve body even when the surface facing the valve seat in the valve body is compressed and installed, and to prolong the service life of the valve body.SOLUTION: On a surface facing a ring member 44 for holding in the large-diameter part of a valve body 42, an annular projection part 42S is formed an outer peripheral edge while adjacent to an annular groove 42G. A maximum depth Dp from the tip of the annular projection part 42S in the groove 42G is set so as to be made larger than a crush margin ΔS of the valve body 42.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a control valve having a piston member.

  For example, as disclosed in Patent Document 1, a pilot solenoid valve as a control valve used in an air conditioner or the like includes a plunger slidably disposed in a plunger tube and a locking portion of the plunger. An annular main valve body made of rubber supported by the valve body to be connected, and a main valve seat that is formed on the peripheral edge of the opening end of the outflow port in the main body of the valve portion and to which the main valve body is selectively abutted The main valve body is arranged around the outer peripheral portion of the plunger tube to open and close the main valve seat, and includes the above-described plunger and a coil that excites the stator facing the plunger as main elements. Yes.

  The annular main valve body is disposed in an annular recess at the lower end of the valve body and is fixed via a washer. Since the inner peripheral portion of the lower end portion of the valve main body is crimped through a washer, the washer is pressed against a surface facing the main valve seat in the vicinity of the inner periphery of the main valve body. Thereby, the vicinity of the inner periphery of the main valve body is compressed by a predetermined amount.

  In such a configuration, when the coil is not excited, the plunger and the valve main body are pushed down, so that the main valve body comes into contact with the main valve seat and the outflow port is closed. On the other hand, when the coil is excited, the main valve body is separated from the main valve seat, so that the outflow port is opened.

JP 2001-263527 A

  Like the rubber main valve body shown in Patent Document 1 described above, the inner peripheral portion of the lower end portion of the valve body is caulked through a washer, so that the main valve body is located at the lower end portion of the valve body. When it is arranged in the annular recess, it is necessary to press the washer evenly with a predetermined caulking allowance over the entire circumference against the surface facing the main valve seat in the vicinity of the inner periphery of the main valve body by caulking.

  However, in such a case, the pressure distribution applied to the surface facing the main valve seat in the vicinity of the inner periphery of the main valve body may not be uniform due to caulking, and the surface may be pulled in one direction. . As a result, it may cause fluid leakage in the main valve seat. Also, when the main valve body is made of rubber, contact and separation between the main valve body and the main valve seat are repeated for a relatively long period of time, or the main valve body is maintained for a relatively long period of time. In the state where it contacts, there is a possibility that a crack may occur in the main valve body.

  In view of the above problems, the present invention is a control valve having a piston member, and even if the face of the valve body facing the valve seat is compressed and attached, the face of the valve body facing the valve seat It is another object of the present invention to provide a control valve that can suppress the occurrence of distortion that causes fluid leakage and can extend the life of the valve body.

  In order to achieve the above object, a control valve according to the present invention has an inlet port connected to a first passage and an outlet port connected to a second passage. A valve body portion having a housing portion that communicates and movably accommodates a piston unit that controls opening and closing of the outlet port; and a piston unit drive mechanism that causes the piston unit to perform an operation of opening and closing the outlet port. The unit includes a seal member having an abutment portion that selectively abuts against a valve seat formed on the periphery of the outlet port, and a piston member that holds the seal member, and the seal member includes the valve seat and the abutment portion. At least one raised portion is provided on the common circumference at a position separated from the contact position, and the piston member compresses the raised portion of the seal member and holds the seal member.

  The seal member may be formed in an annular shape with a resin material, and may be held by the piston member by compressing the ridges on the outer peripheral edge, and the seal member may be formed in an annular shape with a resin material on the inner peripheral edge. The raised portion may be compressed and held by the piston member. Furthermore, the depth of the groove formed adjacent to the raised portion of the seal member may be set larger than the compression amount of the seal member. The seal member may be compressed via the holding ring member and held by the piston member.

  According to the control valve of the present invention, the piston unit includes a seal member having a contact portion that selectively contacts a valve seat formed on the periphery of the outlet port, and a piston member that holds the seal member. The seal member has at least one raised portion on the common circumference at a position separated from the contact position between the valve seat and the contact portion, and the piston member compresses and holds the raised portion of the seal member. Even if the surface of the valve body facing the valve seat is compressed and attached because the surface of the abutting portion is not pulled, the surface of the valve body facing the valve seat will generate distortion that causes fluid leakage. In addition, the life of the valve body can be extended.

(A) And (B) is an exploded perspective view which decomposes | disassembles and shows an example of the piston unit used for an example of the control valve which concerns on this invention, respectively. It is sectional drawing which shows the structure of an example of the control valve which concerns on this invention with the pipe for piping. It is a perspective view which shows the external appearance of the piston unit shown by FIG. 1 (A) and (B). It is sectional drawing which expands and shows the principal part in the example shown by FIG. (A) is a fragmentary sectional view used for description of the valve body and the retaining ring before caulking, and (B) is a fragmentary sectional view showing the VB portion in FIG. 2 in an enlarged manner. It is a fragmentary sectional view which expands and shows another example of a valve body partially with a piston member. It is a fragmentary sectional view which expands and shows still another example of a valve body partially with a piston member.

  FIG. 2 schematically shows a configuration of an example of a control valve according to the present invention together with a pipe for piping.

  In FIG. 2, the control valve is, for example, a normally closed electromagnetic valve, and is arranged in a pipe in a refrigerant circuit in the air conditioner. The solenoid valve includes a suction element 24 that closes one end of a plunger tube 26, a plunger 28 that has a ball valve 34 and is movably disposed in the plunger tube 26, and a discharge passage that is opened and closed by the ball valve 34 of the plunger 28. The main elements are a piston unit having an inner side 36b, a valve main body 10 coupled to one end of the plunger tube 26, and an electromagnetic coil unit which is arranged on the outer periphery of the plunger tube 26 and selectively excites the plunger 28. It is configured to include as.

  The electromagnetic coil unit is mainly configured by a coil portion 20 disposed on the outer peripheral portion of the plunger tube 26 and a casing 16 that covers the coil portion 20 and is accommodated inside. The coil unit 20 is electrically connected to a drive control unit (not shown) via a lead wire 22. The casing 16 is fixed to the suction element 24 by screwing the machine screw 18 into the female screw hole of the suction element 24 through the mounting hole of the casing 16. When the attractor 24 is excited by the coil portion 20, a plunger 28 described later is attracted to the attractor 24 by a magnetic force.

  As shown in FIG. 2, the plunger 28 is movably disposed between the end of the suction element 24 in the plunger tube 26 and a piston member 36 described later. The plunger 28 has a communication path 28a inside. One end of the coil spring 30 is received and accommodated in the enlarged portion of one end of the communication passage 28a facing the end of the suction element 24. The coil spring 30 biases the plunger 28 in a direction separating the plunger 28 from the attracting element 24, that is, toward the piston unit. One end of the coil spring 38 is received and accommodated in the enlarged portion at the other end of the communication path 28a. The coil spring 38 biases the ball valve 34 toward the open end of the ball cap 28A. A ball cap 28 </ b> A that holds the ball valve 34 is joined to the end of the plunger 28. The open end of the ball cap 28A is formed to face the other end of the communication path 28a. The diameter of the open end of the ball cap 28 </ b> A is set smaller than the diameter of the ball valve 34. The ball cap 28A has a plurality of pores so as to be substantially orthogonal to the central axis of the opening end. As a result, the other end of the communication passage 28a communicates with a gap between the outer peripheral portion of the ball cap 28A and the inner peripheral portion of a hole 36A of the piston member 36, which will be described later, via a plurality of pores.

  The valve body 10 is made of a metal material, for example, brass, stainless steel, aluminum alloy, and the like, and has a piston unit housing portion 10A that houses the piston unit together with the ball cap 28A. The piston unit housing portion 10A has an inlet port 10PI to which one end of the high-pressure side piping pipe 12 serving as a first passage is connected on an axis substantially orthogonal to the central axis of the plunger 28, and the central axis of the plunger 28 An outlet port 10PE to which one end of a low-pressure side pipe 14 as a second passage is connected is formed on a common axis.

  An annular valve seat 10V is formed at the opening end of the outlet port 10PE in the inner peripheral portion of the piston unit housing portion 10A, as shown in an enlarged view in FIG. A valve body 42 as a seal member, which will be described later, is selectively brought into contact with the arcuate tip of the valve seat 10V. A flat stopper portion 10S is formed around the valve seat 10V.

  Further, as shown in FIG. 2, a retaining ring 32 is provided adjacent to one end of the plunger tube 26 inside the coupling end portion where one end of the plunger tube 26 is coupled in the valve main body 10. As a result, one end of the piston member 36 comes into contact with the retaining ring 32, so that the position of the piston member 36 separated from the valve seat 10V is regulated. A coil spring 40 that urges the piston member 36 in a direction away from the valve seat 10 </ b> V is disposed between the outer peripheral portion of the piston member 36 and the step portion in the inner peripheral portion of the valve main body portion 10.

  Therefore, the drive mechanism of the piston unit, which will be described later, includes an electromagnetic coil unit, an attractor 24, a plunger 28 including a ball valve 34, and a coil spring 40.

  As shown in an enlarged view in FIG. 1A, the piston unit includes a piston member 36 that is movably disposed in the piston unit housing portion 10A of the valve main body 10 described above, and a first member of the piston member 36. A valve body 42 as a seal member held in the recess 36C, and a holding ring member 44 that is locked to the valve body 42 and holds the valve body 42 in the first recess 36C of the piston member 36. ing.

  The piston member 36 is made of a metal material, for example, brass, stainless steel, or aluminum alloy, and has a hole 36A into which the ball cap 28A and the ball valve 34 are inserted, as shown in FIG. ing. One end of the discharge passage 36b opens at the bottom of the hole 36A. The discharge passage 36b discharges the high-pressure side fluid in the hole 36A to the outlet port 10PE when the ball valve 34 is in the open state. A valve seat for receiving the ball valve 34 is formed at the periphery of one open end of the discharge passage 36b. FIG. 2 shows a closed state of the ball valve 34.

  The other end of the discharge passage 36b opens toward the outlet port 10PE. The discharge passage 36b is formed so as to be disposed on an axis common to the central axis of the plunger 28 described above. Further, an annular protrusion 36B for positioning the valve body 42 is formed on the periphery of the other end of the discharge passage 36b as shown in an enlarged view in FIG. An annular first recess 36C into which the valve body 42 is inserted is formed around the protrusion 36B. At that time, the maximum diameter of the inner peripheral portion of the first recess 36 </ b> C is set to be slightly larger than the maximum diameter of the valve body 42 with a predetermined gap.

  Further, an annular second recess 36D having a diameter larger than the maximum diameter of the inner periphery of the first recess 36C is formed at the periphery of the first recess 36C. A holding ring member 44 described later is inserted into the second recess 36D. The depth along the central axis of the piston member 36 in the second recess 36 </ b> D is set to be equal to or greater than the thickness of the holding ring member 44.

  The holding ring member 44 is locked by a caulking portion 36E formed at the tip of the piston member 36 and is held by the second recess 36D. The caulking portion 36E is formed over the entire circumference. As shown in FIG. 5B, a valve body 42 and a holding ring member 44, which will be described later, are sequentially attached to the first recess 36C and the second recess 36D. The caulking portion 36E is formed with a predetermined caulking allowance by press working. At that time, a part of the caulking portion 36E is pressed against the outer peripheral edge of a holding ring member 44 described later.

  As a result, the pressure acts uniformly on the entire valve element 42 via the holding ring member 44.

  The diameter around the central axis of the piston member 36 at the tip of the caulking portion 36E is set larger than the maximum diameter of the stopper portion 10S as shown in FIG. Thus, when the piston unit closes the outlet port 10PE, there is no possibility that the tip of the caulking portion 36E interferes with the falling portion of the stopper portion 10S of the valve main body portion 10. The caulking portion 36E is not limited to such an example, and may be individually formed at a plurality of locations separated along the circumferential direction, for example.

  The holding ring member 44 is made of a metal material, for example, brass, stainless steel, aluminum alloy, or ceramic, in an annular shape. The material of the holding ring member 44 is not limited to such an example. For example, when the retaining ring member 44 is locked by a caulking portion 36E formed in the tapered portion of the piston member 36, the holding ring member 44 has a strength not to be damaged and a working fluid. Any material having corrosion resistance can be used.

  As shown in the enlarged view of FIG. 3, the holding ring member 44 has a through-hole 44 a into which the small diameter portion 42 </ b> B of the valve body 42 is inserted at the center. The holding ring member 44 has annular surfaces on both end surfaces in the thickness direction.

  The holding ring member 44 is not limited to such an example. For example, the holding ring member 44 has four grooves that cross the annular surface along the radial direction at intervals of 90 ° along the circumferential direction of each annular surface. May be formed facing each other. In such a case, the working fluid or gas in the gap between the outer periphery of the valve body 42 and the inner periphery of the first recess 36C passes between the groove and the inner periphery of the second recess 36D. Will be released. As a result, so-called liquid sealing is avoided.

  The valve body 42 as the sealing member is a resin material, for example, engineering plastics such as polyetheretherketone (PEEK) or polytetrafluoroethylene (PTFE), or a rubber material having a relatively high hardness and excellent durability. As shown in an enlarged view in FIG. The valve body 42 has a circular through hole 42a into which the protrusion 36B of the piston member 36 is inserted. The valve body 42 includes a large-diameter portion 42A that comes into contact with the inner peripheral surface that forms the first recess 36C, and a small-diameter portion 42B that is formed integrally with the large-diameter portion 42A and comes into contact with the tip portion of the valve seat 10V. It is configured.

  On the surface of the large-diameter portion 42A facing the holding ring member 44, as shown in a partially enlarged view in FIGS. 5A and 5B, an annular raised portion 42S is adjacent to the annular groove 42G. And formed on the outer periphery. Before processing the caulking portion 36E, a thickness T (see FIG. 1A) from one end face of the large diameter portion 42A to the tip of the raised portion 42S is a predetermined depth that is greater than the minimum depth of the first recess 36C. Is set to the value of Before the caulking portion 36E is processed, the annular raised portion 42S protrudes beyond the flat surface that forms the second concave portion 36D, so that the holding surface is overlapped with the flat surface that forms the second concave portion 36D and the valve body 42. A predetermined gap CL is formed between the ring member 44 and the ring member 44. The protruding length of the annular raised portion 42S corresponding to the gap CL is the crushing margin ΔS of the raised portion 42S in the processing of the caulking portion 36E.

  As shown in FIG. 4, the position of the groove 42G is set to a position separated by a predetermined distance ΔDa from the contact point at the tip of the valve seat 10V when the small diameter portion 42B is brought into contact with the tip of the valve seat 10V. Has been.

  The maximum depth Dp from the tip of the annular raised portion 42S in the groove 42G is set to be greater than the above-described crushing allowance ΔS (Dp> ΔS). The cross-sectional shape of the bottom of the groove 42G has an arc so as to relieve stress concentration. As shown in FIG. 5B, the width W of the groove 42 </ b> G is such that when the annular raised portion 42 </ b> S is compressed by the holding ring member 44 in the direction indicated by the arrow, It is set so that a predetermined gap is formed between the outer peripheral portion of the small diameter portion 42B.

  When the caulking portion 36E is formed with a predetermined caulking allowance by pressing, the groove 42G is formed in the valve body 42 when the annular raised portion 42S is pressed or compressed by the holding ring member 44 by pressing. By doing so, it is avoided that the surface of the small-diameter portion 42B is pulled in an uneven manner, so that the stress distribution on the surface of the small-diameter portion 42B becomes uniform. In addition, since the groove 42G is formed in the valve body 42, deformation caused by internal stress of the valve body 42 due to heat or the like is also absorbed by the large diameter portion 42A, so that adverse effects on the surface of the small diameter portion 42B are suppressed. The

  The small-diameter portion 42B has a contact portion that selectively contacts the tip of the valve seat 10V and seals the open end of the outlet port 10PE.

  In the above example, the annular raised portion 42S is continuously formed on the entire circumference. However, the present invention is not limited to such an example, and is enlarged and shown in FIG. 1B, for example. As described above, a plurality of raised portions 42 ′ Si (i = 1 to n, n is a positive integer) may be scattered on a common circumference with a predetermined interval.

  1B, the same components as those in FIG. 1A are denoted by the same reference numerals, and redundant description thereof is omitted.

  The valve body 42 ′ as a seal member is a resin material, for example, engineering plastics such as polyetheretherketone (PEEK) or polytetrafluoroethylene (PTFE), or a rubber material having relatively high hardness and excellent durability. Etc. are formed into an annular shape. The valve body 42 ′ has a circular through hole 42 ′ a in which the protrusion 36 B of the piston member 36 is inserted at the center. The valve body 42 'is formed integrally with the large-diameter portion 42'A that contacts the inner peripheral surface forming the first recess 36C, and the large-diameter portion 42'A, and contacts the tip portion of the valve seat 10V described above. The small-diameter portion 42'B.

  On the surface of the large-diameter portion 42'A that faces the holding ring member 44, a plurality of raised portions 42'Si are formed on the outer circumference at a predetermined interval on a common circumference. Before the caulking portion 36E is processed, the thickness from one end face of the large diameter portion 42'A to the tip of the raised portion 42'Si is set to a predetermined value that is larger than the minimum depth of the first recess 36C. ing. Before the caulking portion 36E is processed, the annular raised portion 42'Si protrudes beyond the flat surface that forms the second recess 36D, so that it overlaps the flat surface that forms the second recess 36D and the valve body 42 '. A predetermined gap is formed between the holding ring member 44 and the holding ring member 44. The protruding length of the annular raised portion 42 ′ Si corresponding to the gap becomes the crushing margin of the raised portion 42 ′ Si in the processing of the caulking portion 36 E.

  The small diameter portion 42′B has a contact portion that selectively contacts the tip of the valve seat 10V and seals the open end of the outlet port 10PE.

  In such a configuration, when the attractor 24 and the plunger 28 are not excited by the coil portion 20, the valve element 42 comes into contact with the valve seat 10V as shown in FIG. Is cut off. On the other hand, when the attractor 24 and the plunger 28 are excited by the coil part 20, the plunger 28 is separated from the piston member 36, whereby the ball valve 34 opens the discharge passage 36b, and the piston unit accommodating part 10A High pressure fluid is discharged to the outlet port 10PE. As a result, the pressure in the piston unit housing portion 10 </ b> A decreases, so that the valve body 42 of the piston member 36 is separated from the valve seat 10 </ b> V by the biasing force of the coil spring 40. At that time, the working fluid is supplied into the piston unit housing portion 10A. Therefore, the working fluid from the high-pressure side piping pipe 12 is supplied to the low-pressure side piping pipe 14 along the direction indicated by the arrow F in FIG. Thereafter, when the attractor 24 and the plunger 28 are not excited, the ball valve 34 in the plunger 28 comes into contact with the opening end of the discharge passage 36b by the urging force of the coil spring 30, so that the valve body 42 comes into contact with the valve seat 10V. The working fluid from the high-pressure side piping pipe 12 is shut off.

  Furthermore, the valve body 42 as the seal member is not limited to the above-described example. For example, as shown in a partially enlarged view in FIG. 6, the raised portion 52S of the valve body 52 is formed at the periphery of the through hole 52a. The valve body 52 may be held by the holding ring member 54 while being formed.

  In FIG. 6, an annular protrusion 46 </ b> B for positioning the valve body 52 is formed on the periphery of the other end of the discharge passage 46 b of the piston member 46. An annular recess 46C into which the valve body 52 is inserted is formed around the protrusion 46B. At that time, the maximum diameter of the inner peripheral portion of the recess 46C is set to be slightly larger than the maximum diameter of the valve body 52 with a predetermined gap.

  The holding ring member 54 is locked to the tip of the protrusion 46B. The holding ring member 54 is locked by extending the edge of the tip of the protrusion 46B by flaring.

  The valve main body 60 has a piston unit housing portion inside. In the piston unit housing portion, an outlet port 60PE to which one end of the low-pressure side pipe 14 is connected is formed on the same axis as the central axis of the plunger 28. An annular valve seat 60V is formed at the opening end of the outlet port 60PE in the inner peripheral portion of the piston unit housing portion.

  The valve body 52 is formed in a ring shape from a resin material, for example, an engineering plastic such as polyether ether ketone (PEEK) or polytetrafluoroethylene (PTFE), or a rubber material having a relatively high hardness and excellent durability. Has been. The valve body 52 has a circular through hole 52a into which the protrusion 46B of the piston member 46 is inserted. Part of the inner peripheral portion and the outer peripheral portion of the valve body 52 is in contact with the inner peripheral surface forming the concave portion 46C.

  An annular raised portion 52S is formed on the inner peripheral edge adjacent to the annular groove 52G on the surface of the valve body 52 facing the holding ring member 54. Before the flare processing described above, the thickness from one end surface of the valve body 52 to the tip of the raised portion 52S is set to a predetermined value that is greater than the minimum depth of the recess 46C. Before the flaring process, since the annular raised portion 52S protrudes, a predetermined gap is formed between the holding ring member 54 superimposed on the valve body 52 and the other part of the valve body 52. . The protruding length of the annular raised portion 52S corresponding to the gap becomes a crushing margin of the raised portion 52S in flare processing.

  The position of the groove 52G is set to a position separated by a predetermined distance ΔDb from the contact point at the tip of the valve seat 60V when the contact portion 52B of the valve body 52 is in contact with the tip of the valve seat 60V. .

  The maximum depth from the tip of the annular raised portion 52S in the groove 52G is set to be larger than the above-described crushing allowance. The cross-sectional shape of the bottom of the groove 52G has an arc so as to relieve stress concentration.

  When the projecting portion 46B is expanded through the holding ring member 54 by flaring, the groove 52G is formed in the valve body 52 when the annular raised portion 52S is compressed by the holding ring member 54. Since the surface of the contact portion 52B is avoided from being pulled in a biased manner, the stress distribution on the surface of the contact portion 52B becomes uniform.

  Furthermore, the valve body 62 as the seal member is formed, for example, as shown in a partially enlarged view in FIG. It may be held by the piston member 56 without using the ring member for use.

  In FIG. 7, an annular protrusion 56 </ b> B for positioning the valve body 62 is formed on the periphery of the other end of the discharge passage 56 b of the piston member 56. An annular recess 56C into which the valve body 62 is inserted is formed around the protrusion 56B. At that time, the maximum diameter of the inner peripheral portion of the recess 56C is set to be slightly larger than the maximum diameter of the valve body 62 with a predetermined gap.

  The valve main body 70 has a piston unit housing portion inside. In the piston unit housing portion, an outlet port 70PE to which one end of the low-pressure side piping pipe 14 is connected is formed on the same axis as the central axis of the plunger 56. An annular valve seat 70V is formed at the opening end of the outlet port 70PE in the inner peripheral portion of the piston unit housing portion.

  The valve body 62 is formed in an annular shape from a resin material, for example, engineering plastic such as polyether ether ketone (PEEK), polytetrafluoroethylene (PTFE), or a rubber material having a relatively high hardness and excellent durability. Has been. The valve body 62 has a circular through hole 62a into which the protrusion 56B of the piston member 56 is inserted. Part of the inner peripheral portion and the outer peripheral portion of the valve body 62 is in contact with the inner peripheral surface forming the concave portion 56C.

  An annular raised portion 62S is formed on the outer peripheral edge adjacent to the annular groove 62G on the surface closer to the outer peripheral edge than the surface facing the valve seat 70V in the valve body 62. Before caulking of the caulking portion 56E in the piston member 56, the thickness from one end surface of the valve body 62 to the tip of the raised portion 62S is a predetermined value that can be caulked with the valve body 62 disposed in the recess 56C. Is set to a value. The protruding length of the annular raised portion 62S becomes a crushing margin for the raised portion 62S in the caulking process.

  The position of the groove 62G is set to a position separated by a predetermined distance ΔDc from the contact point at the distal end portion of the valve seat 70V when the contact portion 62B of the valve body 62 is brought into contact with the distal end portion of the valve seat 70V. .

  The maximum depth from the tip of the annular raised portion 62S in the groove 62G is set to be larger than the above-described crushing allowance. The cross-sectional shape of the bottom of the groove 62G has an arc so as to relieve stress concentration.

  When the annular raised portion 62S is compressed by the caulking portion 56E due to the caulking process of the caulking portion 56E, the groove 62G is formed in the valve body 62, whereby the surface of the abutting portion 62B may be pulled unevenly. Since this is avoided, the stress distribution on the surface of the contact portion 62B becomes uniform.

  In the example of the control valve according to the present invention described above, the holding ring member is fixed to the piston member by flaring or caulking. However, the present invention is not limited to such an example. The holding ring member having the above may be fixed to the piston member by being fitted to a male screw portion formed on the outer peripheral portion of the piston member.

  Further, in the above-described example of the control valve according to the present invention, the valve body in the electromagnetic valve including the plunger and the piston member is fixed to the end portion of the cylindrical piston member. However, the present invention is not limited to such an example. For example, as shown in the specification and drawings (FIG. 8) of the previous application (Japanese Patent Application No. 2013-189421) by the present applicant, a piston member that is a plunger, a valve body, and a retaining ring member 44 The valve body may be configured to be fixed in the recess at the end portion of the piston member by the holding ring.

10 Valve body 28 Plunger 36, 46, 56 Piston member 42, 52, 62 Valve body 42S, 42'Si Raised part 42G, 52G, 62G Groove 44, 54 Ring member for holding

Claims (5)

A piston unit that has an inlet port connected to the first passage and an outlet port connected to the second passage, communicates with the inlet port and the outlet port, and controls the opening and closing of the outlet port is movable. A valve main body provided with an accommodating portion for accommodating in,
A piston unit drive mechanism that causes the piston unit to perform an operation of opening and closing the outlet port;
The piston unit includes a seal member having a contact portion that selectively contacts a valve seat formed at a peripheral edge of the outlet port, and a piston member that holds the seal member, and the seal member includes the valve The piston member has at least one raised portion on a common circumference at a position separated from the contact position between the seat and the corresponding contact portion, and the piston member compresses the raised portion of the seal member and holds the seal member. Control valve characterized by   2. The control valve according to claim 1, wherein the seal member is formed in an annular shape with a resin material, and is held by the piston member by compressing a protruding portion of an outer peripheral edge.   2. The control valve according to claim 1, wherein the seal member is formed in an annular shape with a resin material, and is held by the piston member by compressing a protruding portion on an inner peripheral edge.   4. The control valve according to claim 2, wherein the depth of the groove formed adjacent to the raised portion of the seal member is set larger than the compression amount of the seal member.   The control valve according to claim 1, wherein the seal member is compressed and held by the piston member via a holding ring member.

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