JP6851344B2 - Control valve - Google Patents

Description

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

As a switching valve as a control valve used in an air conditioner or the like, for example, as shown in Patent Document 1, a valve body provided with a pilot solenoid valve mechanism and a differential pressure valve mechanism has been proposed. There is.

Such a pilot solenoid valve mechanism is intended to open and close the valve port between the upper chamber communicating with the first passage and the lower chamber communicating with the second passage. The pilot solenoid valve mechanism is a compression coil arranged between the aspirator in the plunger tube, the plunger slidably arranged above the aspirator in the plunger tube, and the aspirator and the plunger. It has a spring, a needle arranged in the hole at the lower end of the plunger, and a valve seat at one end where the tip of the needle is in contact, and the needle selectively hits the valve seat on the periphery of the valve port of the upper chamber described above. It is configured to include a valve body for a solenoid valve in contact and an electromagnetic coil arranged around the outer peripheral portion of the plunger tube as main elements.

As shown in FIGS. 5A and 5B in Patent Document 1, the valve body for a solenoid valve has a packing at the lower end that abuts on the valve seat at the periphery of the valve port of the upper chamber and seals the valve port. What you are doing is proposed. The packing as such a sealing member is held at the lower end of the valve body by both ends of the metal piece. Further, the outer edges of the valve body at both ends of the metal piece are configured to come into contact with the stepped portions of the valve seat on the periphery of the valve port of the upper chamber.

The above-mentioned differential pressure valve mechanism communicates with a third passage connected to the evaporator through a communication hole, and also communicates with the above-mentioned upper chamber for a solenoid valve through another communication hole, and the above-mentioned solenoid valve. The valve body has a lower chamber that communicates with the lower chamber for use through a communication hole. In the upper chamber of the differential pressure valve mechanism, a valve body that has a diaphragm that separates the upper chamber and the lower chamber and opens and closes a communication hole that communicates with the third passage is slidably arranged. Further, in the lower chamber of the differential pressure valve mechanism, a valve body receiver, an adjuster, and a compression coil spring are arranged.

In such a configuration, in the case of heating operation, when the solenoid coil is excited, the valve body for the solenoid valve in the pilot solenoid valve mechanism closes the valve port, and the valve body in the differential pressure valve mechanism communicates with the third passage. By opening the communication hole, the hot gas from the compressor can be discharged into the first passage, the upper chamber, the communication hole in the above-mentioned pilot solenoid valve mechanism, and the upper chamber, the communication hole, and the first in the above-mentioned differential pressure valve mechanism. It is supplied to the evaporator through the passage of 3.

Japanese Unexamined Patent Publication No. 2001-124440 Japanese Unexamined Patent Publication No. 2001-330167 Japanese Unexamined Patent Publication No. 2001-263527

When the valve body for the solenoid valve in the pilot solenoid valve mechanism shown in Patent Document 1 described above closes the valve port, the packing and the valve seat come into contact with each other to close the valve.

However, the packing for the solenoid valve is held by both ends of the metal piece in a state of being in close contact with the lower end of the valve body, and there is no fluid vent passage (gas vent hole) in the gap between the packing and the lower end of the valve body. As suggested in paragraph [0008] of Patent Document 2, pressure (liquid) may accumulate in the gap between the packing and the lower end of the valve body, so-called liquid sealing may occur.

When the gap between the packing and the lower end of the valve body is in a liquid-sealed state, for example, when the cooling operation is switched to the heating operation as described above, the lower end of the valve body has a relatively high pressure and a high temperature. When exposed to the hot gas, the volume of the liquid refrigerant accumulated in the gap between the packing and the lower end of the valve body rapidly expands, and the packing may come off from both ends of the metal piece.

In consideration of the above problems, it is an object of the present invention to provide a control valve having a piston member and capable of avoiding pressure accumulation in the seal member held by the piston member.

In order to achieve the above object, the control valve according to the present invention has an inlet port connected to the first passage and an outlet port connected to the second passage, and the inlet port and the outlet port have an inlet port. The outlet port is opened and closed in the piston unit by adjusting the pressure of the upper part of the piston unit in the valve body and the piston unit accommodating portion, which is provided with the piston unit accommodating portion that movably accommodates the piston unit that communicates and controls the opening and closing of the outlet port. A seal member including a piston unit operation control unit for performing a controlled operation, and a seal member having an annular contact surface in which the piston unit selectively contacts a valve seat formed on the periphery of an outlet port, and a seal member. A holding annular member that is engaged and holds the seal member, and is a part of the bottom surface of a recess formed adjacent to the inner edge of the contact surface of the seal member, and an inner peripheral surface of a through hole of the seal member. A holding annular member having at least one through hole having one open end into which a portion of the piston has penetrated and having the other open end communicating with the exit port, the sealing member of the piston unit. The holding annular member has a through hole into which a columnar portion in the first recess of the piston member is inserted and a recess formed concentrically with the through hole, and the holding annular member is the first recess of the piston member of the piston unit. A fixing portion fixed in a second recess communicating with the fixing portion, an overhanging portion connected to the fixing portion and engaged with the peripheral edge of the recess of the sealing member, and a mutual diameter penetrating the fixing portion and the central portion of the overhanging portion. The angle of the inner peripheral surface that has two different holes and intersects with the open end of the other hole in one hole of the holding annular member is formed by an arc surface, and is the first in the piston member of the piston unit. The columnar portion in the recess is inserted into the through hole of the seal member, and the holding annular member is fixed to the piston member by the caulking portion formed on the peripheral edge of the second recess .

The piston unit operation control unit is a pilot unit having a ball valve for opening and closing the pilot flow path provided at the lower part of the valve body and a plunger having a ball valve, and the central axis of the plunger is the central axis of the piston unit. It may be orthogonal to the other.

According to the control valve according to the present invention, the holding annular member that is engaged with the seal member and holds the seal member is a part of the bottom surface of the recess formed adjacent to the inner edge of the contact surface of the seal member, and by have at least one through-hole having the other open end communicating with the outlet port and having one open end portion of the inner peripheral surface has penetrated the through hole of the seal member, the seal Since the fluid in the gap between the contact surface of the member and the bottom surface of the recess is discharged to the outlet port through the through hole, it is possible to avoid the accumulation of pressure in the seal member held by the piston member.

It is a partial sectional view which shows the main part of the piston unit in an example of the control valve which concerns on this invention partially enlarged. It is sectional drawing which shows the structure of an example of the control valve which concerns on this invention together with the pipe for piping. It is sectional drawing which shows the valve body used in the example shown in FIG. (A) is a plan view of the holding annular member used in the example shown in FIG. 2, and (B) is a sectional view shown along the IVB-IVB line in (A).

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 arranged, for example, in a pipe related to a distributor in an air conditioner.

The control valve is, for example, a piston type solenoid valve, and has a vertical stepped hole 36b along the Z coordinate axis on which the valve seat 40 opened and closed by the ball valve 34 is arranged, and an X orthogonal to the stepped hole 36b. A piston unit having a lateral communication passage 36a along the coordinate axes inside, a valve body portion 10 having a piston unit accommodating portion 10B for accommodating the piston unit so as to be movable in the Z coordinate axis direction, and a piston unit accommodating portion 10B. It is configured to include, as a main element, a pilot portion that adjusts the pressure inside and moves the piston unit to open and close the outlet port 10PE of the valve body portion 10. In FIG. 2, the X coordinate axis is set parallel to the extending direction of the primary side piping pipe 12, which will be described later, and the Z coordinate axis is set parallel to the extending direction of the secondary side piping pipe 14. , Y coordinate axes are assumed to be orthogonal to the X coordinate axis and the Z coordinate axis.

The pilot unit as the piston unit operation control unit described above is integrally formed on the side portion of the outlet port 10PE at the lower part of the valve body portion 10 described later, has a ball valve 22, and is provided in the plunger tube 26 along the X coordinate axis. Mainly a plunger 28 that is movably arranged, a pilot flow path 10a that is opened and closed by a ball valve 22 of the plunger 28, and an electromagnetic coil unit that is arranged on the outer peripheral portion of the plunger tube 26 and selectively excites the plunger 28. It is composed of various elements. One end of the plunger tube 26 is fixed to the cylindrical end of the side wall forming the pilot chamber 10A in the valve body 10. The central axis of the plunger 28 of the pilot portion is orthogonal to the central axis of the piston member 36 described later, which is parallel to the X coordinate axis and parallel to the Z coordinate axis.

The electromagnetic coil unit mainly includes a coil portion 20 arranged on the outer peripheral portion of the plunger tube 26, a suction element 24 that closes one end of the plunger tube 26, and a casing (not shown) that covers the coil portion 20 and accommodates the inside. It is composed as an element. The coil unit 20 is electrically connected to a drive control unit (not shown) via a lead wire (not shown), which is not shown. The casing is fixed to the suction element 24 by screwing a machine screw (not shown) into the female screw hole of the suction element 24 through the mounting hole of the casing. When the attractor 24 and the plunger 28 are excited by the coil portion 20, the plunger 28 is attracted to the attractor 24 by the magnetic force.

As shown in FIG. 2, the plunger 28 is movably arranged between the end of the suction element 24 and the open end of the pilot flow path 10a in the plunger tube 26. The plunger 28 has a recess inside in which one end of a coil spring 30 arranged between the plunger 28 and the suction element 24 is accommodated. One end of the coil spring 30 is in contact with the bottom surface of the recess of the plunger 28. The other end of the coil spring 30 is in contact with the end face of the suction element 24. As a result, the plunger 28 and the ball valve 22 are urged in the direction close to the open end of the pilot flow path 10a by the urging force of the coil spring 30. Further, the plunger 28 has a communication hole 28a extending in the radial direction communicating with the gap between the outer peripheral portion of the plunger 28 and the inner peripheral portion of the plunger tube 26 and the above-mentioned recess.

Therefore, the opening / closing drive mechanism of the pilot flow path 10a of the pilot unit as the piston unit operation control unit includes an electromagnetic coil unit, a plunger 28 including a ball valve 22, and a coil spring 30.

In such a configuration, when the attractor 24 and the plunger 28 are excited by the coil portion 20, when the plunger 28 is attracted to the attractor 24 by the magnetic force, the open end portion of the pilot flow path 10a is opened, which will be described later. As described above, a part of the refrigerant of a predetermined pressure supplied into the piston unit accommodating portion 10B via the inlet port 10PI is connected to the secondary piping pipe via the communication passage 10P, the pilot flow path 10a, and the outlet port 10PE. It is sent within 14. As a result, the pressure between the C-shaped piston ring 32 of the piston member 36 in the piston unit accommodating portion 10B and the end surface of the cap member 16 (hereinafter, also referred to as the piston internal pressure) becomes lower than the pressure of the inlet port 10PI. Due to the difference between the pressure of the inlet port 10PI and the internal pressure of the piston (hereinafter, also simply referred to as the pressure difference), the piston member 36 is raised against the urging force of the coil spring 38, and therefore the outlet port 10PE is released from the closed state. After becoming the open state, the open state is maintained.

The valve body 10 is made of a metal material such as brass, stainless steel, an aluminum alloy, or the like, and has a piston unit accommodating portion 10B for accommodating the piston unit inside. The piston unit accommodating portion 10B has an inlet port 10PI to which one end of a primary side piping pipe 12 as a first passage is connected on an X coordinate axis line substantially orthogonal to the central axis line of the piston unit, and a central axis line of the piston unit. An outlet port 10PE to which one end of the secondary side piping pipe 14 as a second passage is connected is formed on the Z coordinate axis common to the above.

An annular valve seat 10V is formed at the open end of the outlet port 10PE at the inner peripheral portion of the piston unit accommodating portion 10B, as shown in an enlarged manner in FIG. It is assumed that the valve body 42 as a sealing member, which will be described later, selectively abuts on the arcuate tip of the valve seat 10V.

The end of the piston unit accommodating portion 10B facing the valve seat 10V is shielded from the outside by a disc-shaped cap member 16. The cap member 16 is fixed to a stepped hole formed at the end of the piston unit accommodating portion 10B. The outer peripheral edge of the upper end portion of the valve body portion 10 is crimped so that the outer peripheral edge of the valve body portion 10 holds the cap member 16 in the stepped hole by, for example, press working. The portion of the piston unit accommodating portion 10B close to the cap member 16 communicates with one end of the communication passage 10P formed adjacent to the piston unit accommodating portion 10B. The other end of the communication passage 10P extends along the Z coordinate axis toward the pilot room 10A and communicates with the pilot room 10A.

When the outlet port 10PE is closed by the valve body 42 supported by the end of the piston member 36, which will be described later, pressed by the urging force of the coil spring 38 and abuts on the valve seat 10V, the suction element in the pilot portion. When the 24 and the plunger 28 are excited by the coil portion 20, the plunger 28 is attracted to the attractor 24 by the magnetic force, and a part of the internal pressure of the piston is passed through the communication passage 10P, the pilot flow path 10a, and the outlet port 10PE. Is delivered into the secondary piping pipe 14. As a result, the pressure inside the piston decreases, and the piston member 36 is raised by the pressure difference described above against the urging force of the coil spring 38, and as a result, the outlet port 10PE is opened.

The piston unit is a seal member held in a first recess 36A of the piston member 36 and a piston member 36 that is movably arranged along the Z coordinate axis in the piston unit accommodating portion 10B of the valve body 10 described above. 42, and a holding annular member 44 that is engaged with the valve body 42 and holds the valve body 42 in the first recess 36A of the piston member 36.

The piston member 36 is made of a metal material such as brass, stainless steel, an aluminum alloy, or the like, and as shown in FIG. 2, a stage into which the valve seat 40 and the ball valve 34 are inserted. It has a hole 36b inside. An annular recess in which the C-shaped piston ring 32 is arranged is formed on the outer peripheral portion of the piston member 36. The C-shaped piston ring 32 arranged in the recess is slidable with respect to the inner peripheral surface of the piston unit accommodating portion 10B together with the piston member 36. As a result, the flow rate of the relatively high pressure, for example, about 4.2 MPa of the refrigerant supplied into the piston unit accommodating portion 10B through the inlet port 10PI is in sliding contact with the inner peripheral surface of the piston unit accommodating portion 10B. It will be reduced by the ring 32. Therefore, when the ball valve 22 opens the open end of the pilot flow path 10a, the internal pressure of the piston decreases, so that the piston unit can be smoothly raised due to the pressure difference.

The stepped hole 36b described above is formed on an axis common to the central axis of the piston member 36. One open end of the stepped hole 36b is open toward the recess 36B in which the coil spring 38 is arranged. Further, a valve seat 40 for receiving the ball valve 34 is provided at one open end of the stepped hole 36b. The valve seat 40 is fixed by crimping the peripheral edge of the stepped hole 36b toward the peripheral edge of the valve seat 40. The other open end of the stepped hole 36b is open toward the communication passage 36a. The ball valve 34 in the stepped hole 36b is pressed against the peripheral edge of the hole of the valve seat 40 with a predetermined pressure by the urging force of the coil spring 46 protruding from the other end of the stepped hole 36b so as to cross the communication passage 36a. ing. Therefore, a so-called check valve is formed by the ball valve 34, the valve seat 40, and the coil spring 46. Note that FIG. 2 shows the closed state of the ball valve 34.

An annular protrusion 36D for positioning the valve body 42 is formed on the peripheral edge of the end portion of the piston member 36 closer to the valve seat 10V than the communication passage 36a. Further, as shown in FIG. 1 which is partially enlarged, an annular first recess 36A into which the valve body 42 is inserted is formed inside the protrusion 36D. At that time, the depth of the first recess 36A is set to be substantially the same as the thickness T of the valve body 42, which will be described later. The maximum diameter Dc of the inner peripheral portion of the first recess 36A is set to be slightly larger than the maximum diameter of the valve body 42 with a predetermined gap.

The valve body 42 as a sealing member is made of a resin material, for example, a fluororesin such as polytetrafluoroethylene (PTFE), an engineering plastic, or the like, and is formed in an annular shape as shown by being enlarged in FIG. There is. The valve body 42 has a circular through hole 42b in the center into which the columnar portion 36E in the first recess 36A of the piston member 36 described above is inserted. A relatively shallow ring-shaped recess 42a in which the overhanging portion 44F of the holding annular member 44, which will be described later, is locked is formed concentrically with the through hole 42b on the peripheral edge of one opening end of the through hole 42b. There is. The diameter of the recess 42a is set to be larger than the diameter of the through hole 42b. An annular contact surface 42c with which the tip of the valve seat 10V abuts is concentrically formed around the recess 42a.

Further, at the end of the cylindrical portion 36E in the first recess 36A of the piston member 36, an annular second recess 36C in which the fixing portion 44d connected to the overhanging portion 44F of the holding annular member 44 is arranged is formed. Has been done. The inner peripheral portion of the second recess 36C is formed by a flared caulking portion 36sw. The caulking portion 36sw is supposed to hold the fixing portion 44d of the holding annular member 44 in the second recess 36C. The crimped portion 36sw is formed over the entire circumference. The caulking portion 36sw is formed with a predetermined caulking allowance by press working after the valve body 42 and the holding annular member 44 are sequentially mounted on the first recess 36A and the second recess 36C. At that time, the tip of the crimped portion 36sw is pushed into the large-diameter hole 44b of the holding annular member 44, which will be described later.

As shown in FIGS. 4A and 4B, the holding annular member 44 is annularly formed of a ceramic or a metal material, for example, a metal material such as brass, stainless steel, or an aluminum alloy. It is made. The material of the holding annular member 44 is not limited to such an example, and has strength not to be deformed or damaged when locked by the crimped portion 36sw of the piston member 36 and has corrosion resistance to the working fluid. Any material may be used.

The holding annular member 44 is composed of a fixing portion fixed in the second recess 36C of the piston member 36 described above and an overhanging portion 44F connected to the fixing portion and engaged with the peripheral edge of the recess 42a of the valve body 42. Become. The fixing portion has a small diameter hole 44a in the central portion into which a cylindrical portion before press working, which is a caulking portion 36sw of the piston member 36 described above, is inserted. The small-diameter hole 44a communicates with the large-diameter hole 44b formed inside the holding annular member 44. The small diameter hole 44a is formed concentrically with the large diameter hole 44b. The shape of the overhanging portion 44F is not limited to such an example, and may be a shape other than an annular shape such as a square or a polygon.

One through hole 44c is formed in a portion of the overhanging portion 44F that intersects with the outer peripheral portion of the fixed portion 44d. The through hole 44c penetrates the fixed portion 44d and the overhanging portion 44F substantially parallel to the central axis. One end of the through hole 44c faces the region 42AE of the valve body 42 shown by the alternate long and short dash line in FIG. That is, the portion of the through hole 44c along the engaging surface 44e at one opening end is closed by a part of the bottom surface of the recess 42a of the valve body 42, and the portion of the through hole 44c at one opening end is engaged. The portion perpendicular to the surface 44e is close to the inner peripheral surface of the through hole 42b of the valve body 42 with a predetermined gap.

In the portion of one end of the through hole 44c that opens to the engaging surface 44e of the overhanging portion 44F, the region 42AE of the valve body 42 shown by the alternate long and short dash line facing the through hole 44c in FIG. 3, that is, the valve body 42. A part of the bottom surface of the recess 42a and a part of the inner peripheral surface 42b of the valve body 42 have invaded. The opening area of the portion of the through hole 44c that opens to the engaging surface 44e of the overhanging portion 44F is such that one opening end of the through hole 44c opens along the engaging surface 44e and with respect to the engaging surface 44e. Since it is opened in the vertical direction, it has a relatively large area facing the region 42AE of the valve body 42 without increasing the diameter of the cross section of the through hole 44c. As a result, between the inner peripheral surface of the through hole 42b of the valve body 42 and the outer peripheral surface of the cylindrical portion 36E, and the bottom surface of the recess 42a of the valve body 42 and the engaging surface of the overhanging portion 44F of the holding annular member 44. Even if the volume of the working fluid (refrigerant) in the gap between the working fluid (refrigerant) expands, the working fluid (refrigerant) is discharged to the outlet port 10PE which is lower than the pressure of the inlet port 10PI through the through hole 44c. To. Further, when the bottom surface of the recess 42a of the valve body 42 is pressed by the engaging surface 44e of the overhanging portion 44F of the holding annular member 44, the through hole 44c is blocked by the valve body 42 due to the deformation of the valve body 42. Is also avoided. Since the through hole 44c communicates with the outlet port 10PE whose pressure is lower than the pressure of the inlet port 10PI, the working fluid (refrigerant) communicates with the inner peripheral surface of the through hole 42b of the valve body 42 and the outer peripheral surface of the cylindrical portion 36E. It is difficult to penetrate between the space and between the bottom surface of the recess 42a of the valve body 42 and the engaging surface 44e of the overhanging portion 44F of the holding annular member 44.

An arcuate surface 44arc is formed over the entire circumference of the overhanging portion 44F at a portion facing the engaging surface 44e. As a result, when the valve body 42 is separated from the valve seat 10V, the refrigerant is guided by the arc surface. Further, the angle of the inner peripheral surface of the large-diameter hole 44b that intersects with the open end of the small-diameter hole 44a is formed by an arc surface having a predetermined radius Ra. As a result, as described above, when the tip of the crimped portion 36sw is crimped and pushed into the large diameter hole 44b, the deformation of the holding annular member 44 and the through hole 44c is suppressed.

The through hole 44c is not limited to such an example, but is located in a portion of the overhanging portion 44F that is close to the bottom surface of the recess 42a of the valve body 42 and close to the inner peripheral surface of the through hole 42b. It may be provided at a plurality of places.

As a result, when the holding annular member 44 holds the valve body 42, the inner peripheral surface of the through hole 42b of the valve body 42 is the first piston member 36, as shown in FIG. It faces the outer peripheral surface of the cylindrical portion 36E in the recess 36A of the above, and faces the fixed portion of the holding annular member 44. Further, the bottom surface of the recess 42a of the valve body 42 is in contact with the engaging surface 44e of the overhanging portion 44F of the holding annular member 44 at a predetermined pressure over the entire circumference.

In such a configuration, for example, when a high-temperature and high-pressure refrigerant of about 120 ° C. or higher and 4.2 Mpa or higher is introduced into the piston unit accommodating portion 10B, as shown by the arrow RE in FIG. 1, the valve body 42 In the gap between the inner peripheral surface of the through hole 42b and the outer peripheral surface of the cylindrical portion 36E, and between the bottom surface of the recess 42a of the valve body 42 and the engaging surface 44e of the overhanging portion 44F of the holding annular member 44. Even if the volume of a certain working fluid (refrigerant) or gas expands, the working fluid (refrigerant) or gas is discharged to the outlet port 10PE having a low pressure through the through hole 44c. As a result, so-called liquid sealing is avoided.

In the above example, the holding annular member 44 is fixed to the piston member 36 by the caulking portion 36sw, but the present invention is not limited to such an example, and for example, the small diameter hole 44a of the holding annular member 44 is a female screw hole. The holding annular member 44 may be fixed to the piston member 36 by forming a male screw on the inner peripheral portion of the second recess 36C. Further, although an example of the control valve according to the present invention is applied to a pilot solenoid valve, it is not always necessary to do so. For example, an example of a control valve according to the present invention is also applied to a direct acting solenoid valve. Of course, it may be applied.

10 Valve body 10B Piston unit housing 36 Piston member 36A First recess 36C Second recess 36sw Caulking 42 Valve body 42a Recess 42b Through hole 44 Holding annular member 44a Small diameter hole 44b Large diameter hole

Claims (2)

It has an inlet port connected to the first passage and an exit port connected to the second passage.
A valve body portion including a piston unit accommodating portion that communicates with the inlet port and the outlet port and movably accommodates a piston unit that controls opening and closing of the outlet port.
The piston unit is provided with a piston unit operation control unit that adjusts the pressure of the upper part of the piston unit in the piston unit accommodating portion and causes the piston unit to perform an operation of opening / closing the outlet port.
A sealing member having an annular contact surface in which the piston unit selectively contacts a valve seat formed on the peripheral edge of the outlet port, and a holding annular member that is engaged with the sealing member and holds the sealing member. One opening in which a part of the bottom surface of the recess formed adjacent to the inner edge of the contact surface of the seal member and a part of the inner peripheral surface of the through hole of the seal member have penetrated. A holding annular member having at least one through hole having an end and having the other open end communicating with the outlet port.
The sealing member has a through hole into which a cylindrical portion in a first recess of the piston member of the piston unit is inserted, and a recess formed concentrically with the through hole, and the holding annular member is , A fixing portion fixed in a second recess communicating with the first recess of the piston member of the piston unit, and an overhanging portion connected to the fixing portion and engaged with the peripheral edge of the recess of the sealing member. , The angle of the inner peripheral surface that has two holes having different diameters penetrating the central portion of the fixing portion and the overhanging portion and intersecting the open end of the other hole in one hole of the holding annular member. Is formed by an arcuate surface,
The cylindrical portion in the first recess of the piston member of the piston unit is inserted into the through hole of the seal member, and the holding annular member is formed on the peripheral edge of the second recess by the caulking portion of the piston. A control valve characterized in that it is fixed to a member. The piston unit operation control unit is a pilot unit having a ball valve for opening and closing a pilot flow path provided in a lower portion of the valve body and a plunger provided with the ball valve, and the central axis of the plunger is the piston. The control valve according to claim 1, wherein the control valve is orthogonal to the central axis of the unit.

Images