JP2015010655A - Pressure operation valve and method of setting set pressure of pressure operation valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately set a set pressure with a simple structure in a pressure operation valve starting valve opening under the set pressure by deformation of a diaphragm.SOLUTION: An elastic member assembly 4 is constituted by integrating a diaphragm 41 with cylindrical lower cover 42 and upper cover 43. A male screw portion 1a is formed on an outer periphery of a valve body 1, and a female screw portion is formed on an inner peripheral face of the lower cover 42. A valve element 2 composed of a ball valve 21 and a valve rod 22, is disposed in a valve chest 14. The ball valve 21 is brought into contact with a valve seat 13a, and a flat portion 41b of the diaphragm 41 is brought into contact with the valve rod by energizing force. By screwing the elastic member assembly 4 to the valve body, force for pressing the valve element 2, of the diaphragm 41 is adjusted, and the set pressure is adjusted by a screwing amount.

Description

  The present invention relates to a pressure-actuated valve and a pressure-actuated valve in which a valve port is closed by a spring force of an elastic member such as a bellows or a diaphragm, and the elastic member starts to be deformed by a preset fluid pressure and the valve port is opened. The present invention relates to a method for setting a set pressure in.

  Conventionally, as this type of pressure-operated valve, for example, there is one disclosed in Japanese Patent Laid-Open No. 6-229481 (Patent Document 1). The pressure actuated valve disclosed in Patent Document 1 is provided with a ball valve that is seated / separated with respect to a valve seat and a bellows as an elastic member that biases the ball valve toward the valve seat in the valve chamber of the valve body. It is a thing. When the pressure of the fluid flowing in from the inflow pipe is equal to or lower than a preset pressure (hereinafter referred to as “set pressure”), the ball valve is always seated on the valve seat (valve closed state). When the pressure of the fluid flowing in from above exceeds the set pressure, the bellows contracts, the ball valve separates from the valve seat, and the fluid is discharged from the outflow pipe. In addition, a rod and an adjustment spring that urge the free end of the bellows toward the ball valve are provided in a cylinder extending from the valve chamber, and the compression pressure of the adjustment spring is adjusted with an adjustment screw to set the set pressure. is there.

  Further, as an elastic member for starting valve opening when the fluid pressure exceeds the set pressure, a pressure-actuated valve using a diaphragm is disclosed in, for example, Utility Model Registration No. 3151299 (Patent Document 2), Japanese Patent Application Laid-Open No. 2006-77823. (Patent Document 3) and JP-A-2009-243607 (Patent Document 4).

JP-A-6-229481 Utility Model Registration No. 3151299 JP 2006-77823 A JP 2009-243607 A

  The pressure actuated valve of Patent Document 1 has a structure in which the force by which the bellows presses the ball valve, that is, the set pressure is adjusted via the coil spring, so that a coil spring or the like is required and the number of parts increases. There is a problem. Moreover, since the set pressure is affected by both the spring force of the coil spring and the elastic force of the bellows, it is difficult to finely adjust the set pressure.

  Further, the pressure actuated valves of Patent Documents 2 to 4 do not have a structure capable of adjusting the set pressure, and the set pressure is determined at the time of designing and manufacturing the shape, number of sheets, and thickness of the diaphragm. For this reason, it is difficult to accurately set the set pressure in accordance with the use environment and the like, leaving room for improvement.

  An object of the present invention is to make it possible to accurately set a set pressure with a simple structure in a pressure operating valve that starts opening at a set pressure by deformation of an elastic member such as a bellows or a diaphragm.

  According to a first aspect of the present invention, there is provided a pressure actuated valve having a valve body formed with a valve port for flowing a fluid flowing from a primary side joint to a secondary side joint, an elastic member deformable in an axial direction of the valve port, and the axis. A central cylindrical member, demarcating a pressure chamber communicating with the primary side joint by the valve body, the elastic member, and the cylindrical member, and the pressure of the pressure chamber is equal to or lower than a set pressure Sometimes the urging force of the elastic member brings the valve portion into contact with the valve seat around the valve port to close the valve port, and when the pressure in the pressure chamber exceeds a set pressure, the elastic member is deformed. The valve portion is a pressure-actuated valve that leaves the valve seat and opens the valve port, and the elastic member is fixed to the cylindrical member so as to be deformable in the axial direction of the cylindrical member. An elastic member assembly, and the elastic portion The elastic member assembly is attached to the valve body in a state in which the cylindrical member of the assembly and the valve body are fitted from the axial direction and the valve portion is brought into contact with the valve seat by the urging force of the elastic member. It is characterized by being fixed.

  The pressure-actuated valve according to claim 2 is the pressure-actuated valve according to claim 1, wherein the cylindrical member of the elastic member assembly and the valve main body are screwed together by an internal thread and an external thread centering on the axis. The cylindrical member and the valve main body are fitted.

  The pressure-actuated valve according to claim 3 is the pressure-actuated valve according to claim 1 or 2, wherein a valve chamber and a valve insertion hole communicating from the valve port to the pressure chamber are formed in the valve body, and the valve The portion is a valve body slidable in the axial direction within the valve insertion hole, and the valve body is biased toward the elastic member.

  The pressure-actuated valve according to claim 4 is the pressure-actuated valve according to claim 3, wherein the valve body is configured by integrating a valve rod and a ball valve, and the valve body and the insertion hole have the A valve rod is disposed on the elastic member side and the ball valve is disposed on the valve seat side, and the ball valve can be brought into contact with the valve seat.

  The pressure-actuated valve according to claim 5 is the pressure-actuated valve according to claim 1 or 2, wherein the valve seat is disposed in the pressure chamber, and a flat portion at the center of the elastic member is used as the valve portion. It is characterized by.

  The method for setting the set pressure in the pressure actuated valve according to claim 6 includes: a valve body formed with a valve port for flowing a fluid flowing from the primary side joint to the secondary side joint; and a cylindrical shape centering on an axis of the valve port A cylindrical member, an elastic member which is disposed opposite to the cylindrical space of the cylindrical member and is deformable in the axial direction, and a valve seat around the valve port by the urging force of the elastic member. A valve portion that closes the port, and the elastic member is deformed by the pressure of the pressure chamber so that the valve portion opens the valve port so that the valve port is open. A method for setting a set pressure in a pressure actuated valve for setting a set pressure at which the valve portion of the pressure actuated valve starts to be separated from the valve seat, wherein the elastic member is deformable in the axial direction of the cylindrical member. Elastic part fixed to cylindrical member Configure assembly, the relative displacement amount in the axial direction between the valve body and the elastic member assembly, and sets the set pressure in the pressure actuated valve.

  According to the pressure actuated valve of claim 1, by adjusting the relative displacement in the axial direction between the elastic member assembly and the valve body in a state where the cylindrical member of the elastic member assembly and the valve body are fitted, Since the set pressure can be adjusted according to the amount of displacement, the set pressure can be easily set.

  According to the pressure actuated valve of claim 2, in addition to the effect of claim 1, at the time of setting the set pressure, the elastic member assembly is screwed into the valve body by screwing of the female screw and the male screw, and the set pressure is set according to the screwing amount. Therefore, the set pressure can be set with high accuracy.

  According to the pressure actuated valve of claim 3, in addition to the effect of claim 1 or 2, since the valve stem is guided by the insertion hole, the valve stem slides along the axis, and the valve port is securely connected to the valve. It can be in a closed state.

  According to the pressure actuated valve of the fourth aspect, in addition to the effect of the third aspect, the valve port can be surely closed by the centripetal action on the valve seat of the ball valve.

  According to the pressure actuated valve of claim 5, in addition to the effect of claim 1 or 2, the valve port is directly opened and closed by the flat portion of the elastic member, so that the number of parts is small and the structure is simple.

  According to the setting method of the set pressure in the pressure actuated valve of claim 6, as in the case of claim 1, by adjusting the relative displacement amount in the axial direction between the elastic member assembly and the valve main body, Since the set pressure can be set accordingly, the set pressure can be easily set.

It is a longitudinal section of the pressure operation valve of a 1st embodiment of the present invention. It is the enlarged plan view and expanded sectional view which show the detail before the assembly | attachment of the diaphragm of the pressure actuated valve of embodiment. It is a longitudinal cross-sectional view of the pressure actuated valve of 2nd Embodiment of this invention. It is a figure which shows the other example of the valve body applied to the pressure operating valve of 1st Embodiment.

  Next, an embodiment of a pressure operated valve of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal cross-sectional view of the pressure-actuated valve according to the first embodiment. The pressure actuated valve of this embodiment has a valve body 1 whose outer shape is substantially cylindrical. The valve body 1 includes a pipe connection hole 11, a pipe connection hole 12, a valve port 13, a valve chamber 14, a valve insertion hole 14 a having the same diameter as the valve chamber 14, a primary side port 15, and a spring chamber 16. And pressure equalizing holes 17 are formed. A primary side joint 11 a into which a fluid flows is attached to the pipe connection hole 11 as indicated by an arrow. Further, a secondary side joint 12a through which a fluid flows out is attached to the pipe connection hole 12 as shown by an arrow, and the inner periphery of the secondary side joint 12a on the valve port 13 side is a secondary side port 12a1. The primary side joint 11a and the secondary side joint 12a are assembled together with the valve body 1 by brazing. The primary side joint 11 a is communicated with the valve chamber 14 via the primary side port 15, and the secondary side joint 12 a is communicated with the valve chamber 14 via the valve port 13. Further, the primary side port 15 communicates with the spring chamber 16 through the pressure equalizing hole 17. The valve port 13 is a cylindrical hole (hole having a circular cross section) centered on the axis L.

  The valve chamber 14, the valve insertion hole 14a, and the spring chamber 16 are formed by piercing from the end of the valve body 1 opposite to the secondary port 12, and the valve chamber 14 and the valve insertion hole 14a have a "valve" The valve body 2 as a “part” is disposed. The valve body 2 includes a ball valve 21 and a cylindrical valve rod 22, and the ball valve 21 is fitted and fixed in the centering recess 22 a at the end of the valve rod 22. The spring chamber 16 is formed as a ring-shaped deep groove around the valve chamber 14 and the valve insertion hole 14 a, and the coil spring 3 is disposed in the spring chamber 16. A hook-shaped spring receiver 22b is fixed to the valve rod 22, and the coil spring 3 is compressed between the bottom of the spring chamber 16 and the spring receiver 22b. As a result, the coil spring 3 biases the valve body 2 toward the diaphragm 41 described later, and presses the valve rod 22 against the diaphragm 41. The valve insertion hole 14a (and the valve chamber 14) has a cylindrical shape aligned with the valve rod 22, and the valve rod 22 can slide accurately in the direction of the axis L within the valve insertion hole 14a. The force of the coil spring 3 applied to the spring receiver 22b is F, the pressure on the primary side when the valve is closed is PD, the pressure on the secondary side is Ps, and the sectional area of the valve port 13 is S. The force is set to satisfy F <(PD−Ps) × S, and is relatively weak enough to allow the valve body 2 to follow and move in the direction of the axis L when the diaphragm 41 is deformed as described later. Spring force.

  An elastic member assembly 4 is attached to the valve body 1 on the side opposite to the secondary side joint 12a. The elastic member assembly 4 includes a diaphragm 41 as an “elastic member”, a lower lid 42 as a “cylindrical member”, and a disk-shaped upper lid 43. The diaphragm 41, the lower lid 42, and the upper lid 43 are welded and fixed together at the outer peripheral portion indicated by the dashed-dotted ellipse in FIG.

  FIG. 2 is an enlarged plan view and an enlarged sectional view showing details before the diaphragm 41 is assembled. The diaphragm 41 is a disk-shaped rotating body having the axis L as the center of rotation, and is constituted by a metal leaf spring. And it has the cone part 41a which makes a truncated cone shape and a spherical surface, the flat part 41b located in the inner center of the cone part 41a, and the flange part 41c located in the outer periphery of the cone part 41a.

  The lower lid 42 as a “cylindrical member” has a substantially cylindrical shape centered on the axis L, and a diaphragm 41 is disposed opposite to the inner cylindrical space, and the valve body 1, the diaphragm 41, A pressure chamber A1 communicating with the spring chamber 16 is defined by the lid 42. The diaphragm 41 can be deformed in the direction of the axis L with respect to the lower lid 42. The pressure chamber A1 communicates with the primary side joint 11a through the spring chamber 16, the pressure equalizing hole 17, and the primary side port 15.

  A male screw portion 1 a centering on the axis L is formed on the upper outer periphery of the valve body 1, and a female screw portion 42 a centering on the axis L is formed on the inner peripheral surface of the lower lid 42. The elastic member assembly 4 is attached to the valve body 1 by screwing the female thread portion 42 a of the lower lid 42 into the male thread portion 1 a of the valve body 1. Further, the elastic member assembly 4 and the valve body 1 are fixed to each other at the welded portion 421 at the lower end of the lower lid 42. The valve body 1 and the lower lid 42 are sealed with a sealing member made of an O-ring 18, PTFE (polytetrafluoroethylene), or the like disposed inside the welded portion 421.

  With the above configuration, the fluid flows from the primary side joint 11a, and this fluid is the primary side port 15, the clearance between the valve insertion hole 14a and the valve rod 22, the pressure equalizing hole 17, the spring chamber 16, and the pressure chamber A1. The pressure is applied to the diaphragm 41 via When this pressure is equal to or lower than the set pressure, the diaphragm 41 is not deformed, the valve rod 22 is pressed by the urging force of the diaphragm 41, and the ball valve 21 is pressed against the valve seat 13a around the valve port 13. 1 is closed. Further, the fluid flowing in from the primary side joint 11a flows into the valve chamber 14 from the primary side port 15, but in the state of FIG. 1, the ball valve 21 closes the valve port 13, and the fluid flows into the secondary side joint 12a. Absent.

  On the other hand, when the pressure of the fluid increases and the pressure in the pressure chamber A1 exceeds the set pressure, the diaphragm 41 is deformed in the direction of the axis L, and the valve body 2 follows the deformation of the diaphragm 41 by the spring force of the coil spring 3, and the axis line Move in the L direction. As a result, the ball valve 21 is separated from the valve seat 13a, the valve port 13 is opened, and the fluid in the valve chamber 14 begins to flow from the valve port 13 to the secondary side joint 12a. As the pressure in the pressure chamber A1 increases, the distance between the ball valve 21 and the valve seat 13a increases, and the amount of fluid flowing through the secondary side joint 12a increases.

  A jig hole 43 a is formed in the upper lid 43 of the elastic member assembly 4. Before the lower lid 42 is fixed by the welded portion 421, the jig is engaged with the jig hole 43 a and the elastic member assembly 4 is engaged. The elastic member assembly 4 can be moved in the direction of the axis L with respect to the valve body 1 by turning. That is, the elastic member assembly 4 is screwed into the valve body 1 and the diaphragm 41 is brought into contact with the valve body 2 (valve rod 22) by the urging force of the diaphragm 41. By adjusting this screwing amount (relative displacement amount between the elastic member assembly 4 and the valve body 1), the force with which the diaphragm 41 presses the valve body 2 can be adjusted, so that the pressure in the pressure chamber A1 can be adjusted. Accordingly, the pressure at which the valve port 13 starts to open, that is, the set pressure can be adjusted.

  When the set pressure is adjusted, a fluid having a pressure corresponding to the target set pressure is supplied from the primary side joint 11a, and the valve port 13 is closed by screwing the elastic member assembly 4 ( When the fluid no longer flows out from the secondary joint 12a), the screwing operation of the elastic member assembly 4 is stopped. In the welded portion 421, the elastic member assembly 4 and the valve body 1 are fixed. As described above, by adjusting the relative displacement amount of the elastic member assembly 4 and the valve body 1 in the direction of the axis L, the setting operation for adjusting the set pressure is facilitated. For adjusting the set pressure, the elastic member assembly 4 is once screwed in a predetermined amount to close the valve, and a fluid having a pressure corresponding to the target set pressure is supplied from the primary side joint 11a, and the screw is gradually loosened. The screw operation of the elastic member assembly 4 may be stopped and welded when the valve port 13 is in the valve open state (when fluid begins to flow out from the secondary side joint).

  In the first embodiment, since the cylindrical valve port 13 is closed by the ball valve 21 of the valve body 2, the valve port 13 is reliably brought into the valve closed state by the centripetal action of the ball valve 21 with respect to the valve seat 13 a. can do. Further, since the valve rod 22 is slid within the valve insertion hole 14a, the valve body 2 slides accurately along the axis L, so that the valve opening degree in the valve open state is made accurate. Can do.

  In the said 1st Embodiment, although the valve body 2 is comprised by the ball valve 21 and the valve rod 22, a valve body as shown, for example in FIG. 4 may be sufficient. Each of these valve bodies has a cylindrical portion corresponding to the valve stem 22. The valve body in FIG. 4 (A) has a ball-like lower end on the valve port side. The valve body of FIG. 4 (B) has a needle port at the lower end on the valve port side. The valve body in FIG. 4 (C) has a flat bottom surface on the valve port side that abuts against the valve seat 13a.

  FIG. 3 is a vertical cross-sectional view of the pressure operated valve of the second embodiment. The pressure operated valve of this embodiment has a valve body 5 whose outer shape is substantially cylindrical. A pipe connection hole 51, a pipe connection hole 52, a valve port 53, a primary side port 54 and a secondary side port 55 are formed in the valve body 5. A primary side joint 51a into which a fluid flows is attached to the pipe connection hole 51 as shown by an arrow, and a secondary side joint 52a from which a fluid flows out is attached to the pipe connection hole 52 as shown by an arrow. The primary side joint 51a and the secondary side joint 52a are assembled integrally with the valve body 5 by brazing. The valve port 53 is a hole having a circular cross section centered on the axis L.

  An elastic member assembly 6 is attached to the outer periphery of the valve body 5. The elastic member assembly 6 includes a diaphragm 61 as an “elastic member”, a lower lid 62 as a “cylindrical member”, and a disk-shaped upper lid 63. The diaphragm 61, the lower lid 62, and the upper lid 63 are welded and fixed together at an outer peripheral portion indicated by an alternate long and short dashed line in FIG.

  Similar to the diaphragm 41 shown in FIG. 2 described above, the diaphragm 61 is a disk-shaped rotating body having the axis L as the center of rotation, and is constituted by a metal leaf spring. Then, a conical part 61a having a truncated cone shape and a slightly spherical surface, a flat part 61b as a “valve part” located at the inner center of the conical part 61a, and a flange part 61c located on the outer periphery of the conical part 61a And have.

  The lower lid 62 as a “cylindrical member” has a substantially cylindrical shape centered on the axis L, and a diaphragm 61 is disposed opposite to the inner cylindrical space, and the valve body 5, the diaphragm 61, The lid 62 defines a pressure chamber A2. The diaphragm 61 is deformable in the direction of the axis L with respect to the lower lid 62. The pressure chamber A2 communicates with the primary side joint 51a via the primary side port 54. Further, the valve port 53 communicates with the secondary side joint 52 a through the secondary side port 55. The periphery of the valve port 53 on the pressure chamber A2 side is a valve seat 53a protruding into the pressure chamber A2, and the flat portion 61b of the diaphragm 61 is in contact with the valve seat 53a.

  A male screw portion 5 a centering on the axis L is formed on the upper outer periphery of the valve body 5, and a female screw portion 62 a centering on the axis L is formed on the inner peripheral surface of the lower lid 62. The elastic member assembly 6 is attached to the valve body 5 by screwing the female thread portion 62 a of the lower lid 62 into the male thread portion 5 a of the valve body 5. In addition, the elastic member assembly 6 and the valve body 6 are fixed to each other at the welded portion 621 at the lower end of the lower lid 62. The valve body 5 and the lower lid 62 are sealed with an O-ring 58 disposed on the inner side than the welded portion 621.

  With the above configuration, the fluid flows from the primary side joint 51a, and this fluid applies pressure to the diaphragm 61 via the primary side port 54 and the pressure chamber A2. When this pressure is equal to or lower than the set pressure, the diaphragm 61 is not deformed and the flat portion 61b is pressed against the valve seat 53a by the urging force of the diaphragm 61, and the valve is closed as shown in FIG. As a result, the fluid in the pressure chamber A2 does not flow to the valve port 53 and the secondary side joint 52a.

  On the other hand, when the pressure of the fluid increases and the pressure in the pressure chamber A2 exceeds the set pressure, the diaphragm 61 is deformed, and the flat portion 61b is separated from the valve seat 53a to be in the valve open state. Thereby, the fluid in the pressure chamber A2 starts to flow from the valve port 53 to the secondary side joint 52a. As the pressure in the pressure chamber A2 increases, the distance between the flat portion 61b and the valve seat 53a increases, and the amount of fluid flowing through the secondary side joint 52a increases.

  A jig hole 63 a is formed in the upper lid 63 of the elastic member assembly 6, and before the lower lid 62 is fixed by the welded portion 621, the jig is engaged with the jig hole 63 a and the elastic member assembly 6 is engaged. The elastic member assembly 6 can be moved in the direction of the axis L with respect to the valve body 5 by turning. That is, the elastic member assembly 6 is screwed into the valve body 5 and the diaphragm 61 is brought into contact with the valve seat 53 a by the urging force of the diaphragm 61. By adjusting the screwing amount (relative displacement amount between the elastic member assembly 4 and the valve body 1), the force with which the flat portion 61b of the diaphragm 61 presses the valve seat 53a can be adjusted. The pressure at which the valve port 53 starts to open, that is, the set pressure can be adjusted according to the pressure of A2.

  Also in the second embodiment, when the set pressure is adjusted, a fluid having a pressure corresponding to the target set pressure is supplied from the primary side joint 51a, and the valve port 53 is brought into the valve-closed state by screwing the elastic member assembly 6. At this point (when fluid no longer flows out from the secondary side joint 52a), the screwing operation of the elastic member assembly 6 is stopped. In the welded portion 621, the elastic member assembly 6 and the valve body 5 are fixed. Thus, by adjusting the relative displacement amount of the elastic member assembly 6 and the valve body 5 in the direction of the axis L, the setting operation for adjusting the set pressure is facilitated.

  In the second embodiment, since the valve port 53 is directly opened and closed by the flat portion 61b of the diaphragm 61, the number of parts is smaller than in the first embodiment, and the structure is simple.

  As described above, in each embodiment, at the time of setting the set pressure, the elastic member assembly (4, 6) is screwed into the valve body (1, 5) by screwing the female screw and the male screw, and the set pressure is set according to the screwing amount. Therefore, the set pressure can be set with high accuracy.

  In each of the above embodiments, an example has been described in which a male screw portion is formed on the valve body side and a female screw portion is formed on the elastic member assembly side. However, a female screw portion is formed on the inner side of the valve main body, and a male screw portion is formed on the outer side of the elastic member assembly. The elastic member assembly may be attached to the valve main body by screwing the female screw portion and the male screw portion.

  In each embodiment, the elastic member assembly is fitted into the valve body by screwing the male screw part and the female screw part. It is also possible to form cylindrical surfaces that are fitted to each other and to fit each other in the axial direction on these cylindrical surfaces. In this case, when adjusting the set pressure, a jig holding the elastic member assembly and the valve body is used to supply a fluid having a pressure corresponding to the target set pressure from the primary side joint, while the elastic member assembly and the valve are supplied. The amount of relative displacement in the axial direction with respect to the main body is adjusted, and the amount of displacement is fixed when the valve port is closed. Then, the elastic member assembly 6 valve body is fixed at the welded portion. In this way, setting work for adjusting the set pressure is facilitated.

  Moreover, although each embodiment demonstrated the case where an elastic member is a diaphragm, this bellows etc. may be sufficient as this elastic member.

DESCRIPTION OF SYMBOLS 1 Valve body 1a Male thread part 11a Primary side joint 12a Secondary side joint 13 Valve port 13a Valve seat 14 Valve chamber 14a Valve insertion hole L Axis 2 Valve body (valve part)
21 Ball valve 22 Valve stem 3 Coil spring 4 Elastic member assembly 41 Diaphragm (elastic member)
42 Lower lid (cylindrical member)
42a Female thread A1 Pressure chamber 5 Valve body 5a Male thread 51a Primary side joint 52a Secondary side joint 53 Valve port 53a Valve seat 6 Elastic member assembly 61 Diaphragm (elastic member)
61b Flat part (valve part)
62 Lower lid (cylindrical member)
62a Female thread A2 Pressure chamber

Claims (6)

A valve body formed with a valve port for flowing fluid flowing from the primary side joint to the secondary side joint, an elastic member deformable in the axial direction of the valve port, and a cylindrical cylindrical member centering on the axis, With
A pressure chamber communicating with the primary side joint is defined by the valve body, the elastic member, and the cylindrical member, and when the pressure in the pressure chamber is equal to or lower than a set pressure, the valve portion is moved by the urging force of the elastic member. The valve port is closed by contacting the valve seat around the valve port. When the pressure in the pressure chamber exceeds a set pressure, the elastic member is deformed and the valve portion is separated from the valve seat. A pressure-actuated valve that opens the valve port,
The elastic member is fixed to the cylindrical member so as to be deformable in the axial direction of the cylindrical member to constitute an elastic member assembly, and the cylindrical member and the valve body of the elastic member assembly are fitted from the axial direction. The pressure actuated valve is characterized in that the elastic member assembly is fixed to the valve body in a state where the valve portion is brought into contact with the valve seat by the biasing force of the elastic member.   The cylindrical member and the valve main body are fitted into the cylindrical member and the valve main body of the elastic member assembly by screwing a female screw and a male screw centered on the axis. The pressure actuated valve as described.   The valve body is formed with a valve chamber and a valve insertion hole communicating from the valve port to the pressure chamber, and the valve portion is a valve body slidable in the axial direction within the valve insertion hole. The pressure-actuated valve according to claim 1, wherein the pressure-actuated valve is biased toward the elastic member.   The valve body is configured by integrating a valve rod and a ball valve, the valve rod is disposed on the elastic member side in the valve chamber and the insertion hole, and the ball valve is disposed on the valve seat side. The pressure-actuated valve according to claim 3, wherein the valve can be brought into contact with the valve seat.   The pressure-actuated valve according to claim 1 or 2, wherein the valve seat is disposed in the pressure chamber, and a flat portion at a center of the elastic member is used as the valve portion. A valve body in which a valve port for flowing fluid flowing from the primary side joint to the secondary side joint is formed, a cylindrical cylindrical member centered on the axis of the valve port, and opposed to the cylindrical space of the cylindrical member An elastic member disposed and deformable in the axial direction; and a valve portion that brings the valve port into a closed state by abutting against a valve seat around the valve port by an urging force of the elastic member, and the pressure The pressure member is configured such that the elastic member is deformed by the pressure of the chamber so that the valve part opens the valve port, and the valve part of the pressure actuated valve starts to be separated from the valve seat. A method for setting a set pressure in a pressure operated valve that sets a set pressure,
The elastic member is fixed to the cylindrical member so as to be deformable in the axial direction of the cylindrical member to form an elastic member assembly, and the relative displacement amount in the axial direction between the elastic member assembly and the valve body is A method for setting a set pressure in a pressure-actuated valve, wherein the set pressure in the pressure-actuated valve is set.

Images