CN104251325A - Pressure operating valve and pressure setting method of pressure operating valve - Google Patents

Abstract

The present invention provides a pressure-operated valve in which the valve is opened at a set pressure by deformation of a diaphragm (41), and the set pressure can be set with high precision with a simple structure. The diaphragm (41) is integrally formed with a cylindrical lower cover (42) and an upper cover (43) to form an elastic member assembly (4). An external thread portion (1a) is formed on the outer periphery of the valve main body (1), and an internal thread portion (62a) is formed on the inner peripheral surface of the lower cover (42). A valve body (2) composed of a ball valve (21) and a valve stem (22) is arranged in a valve chamber (14). The ball valve (21) is brought into contact with the valve seat (13a), and the flat portion (41b) of the diaphragm (41) is brought into contact with the valve stem by force. The force of the diaphragm (41) pressing the valve body (2) is adjusted by screwing the elastic component assembly (4) into the valve body, thereby adjusting the set pressure according to the amount of screwing in.

Description

How to set pressure-operated valve and set pressure of pressure-operated valve

technical field

The invention relates to a pressure-operated valve that uses the elastic force of elastic components such as bellows and diaphragm to close the valve port, and utilizes the pressure of the preset fluid to deform the elastic component to open the valve port and the setting pressure of the pressure-operated valve. Setting method.

Background technique

Conventionally, as such a pressure-operated valve, there is, for example, a valve disclosed in JP-A-6-229481 (Patent Document 1). The pressure-operated valve of Patent Document 1 is provided with a ball valve seated/disengaged from a valve seat and a bellows as an elastic member biasing the ball valve toward the seat side in a valve chamber of a valve body. In addition, when the pressure of the fluid flowing in from the inflow pipe is below the 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 into the inflow pipe exceeds the set pressure, the bellows shrinks, the ball valve is released from the valve seat, and the fluid flows out from the outflow pipe. In addition, a rod and an adjustment spring that urge the free end of the bellows to the ball valve side are installed in the cylinder protruding from the valve chamber, and the compression amount of the adjustment spring is adjusted with the adjustment screw to set the above-mentioned set pressure. .

In addition, a pressure-operated valve using a diaphragm as an elastic member for starting the valve opening when the pressure of the fluid exceeds a set pressure is disclosed in, for example, Utility Model Registration No. 3151299 (Patent Document 2), Japanese Patent Laid-Open No. 2006-77823 Japanese Patent Publication No. 2009-243607 (Patent Document 4).

prior art literature

patent documents

Patent Document 1: Japanese Patent Application Laid-Open No. 6-229481

Patent Document 2: Utility Model Registration No. 3151299

Patent Document 3: Japanese Patent Laid-Open No. 2006-77823

Patent Document 4: Japanese Patent Laid-Open No. 2009-243607

Contents of the invention

The problem to be solved by the invention

The pressure-operated valve of Patent Document 1 has a structure in which the force that the bellows presses the ball valve, that is, the set pressure is adjusted via a coil spring. Therefore, a coil spring is required and the number of parts increases. In addition, since the set pressure is affected by both the elastic force of the coil spring and the elastic force of the bellows, fine adjustment of the set pressure is difficult.

In addition, the pressure-operated valves of Patent Documents 2 to 4 do not have a structure capable of adjusting the set pressure, and the set pressure is determined by the shape, number, and wall thickness of the diaphragms during design and manufacture. Therefore, it is difficult to set the set pressure with high precision according to the usage environment and the like, and there is room for improvement.

The object of the present invention is to set the set pressure with high precision with a simple structure in a pressure operated valve that starts opening at a set pressure by utilizing deformation of elastic members such as a bellows and a diaphragm.

Solution to the problem

The pressure-operated valve according to claim 1 includes: a valve main body formed with a valve port allowing fluid flowing in from the primary side joint to flow to the secondary side joint; an elastic member deformable in the axial direction of the valve port; A cylindrical cylindrical member, the valve main body, the elastic member, and the cylindrical member define a pressure chamber communicating with the primary side joint. When the pressure in the pressure chamber is below the set pressure, the elastic The force of the component makes the valve part contact the valve seat around the valve port to make the valve port in the closed state. When the pressure in the pressure chamber exceeds the set pressure, the elastic member deforms, and the valve part is released from the valve. The seat is separated to make the valve port in the valve-open state, and the pressure-operated valve is characterized in that the elastic member is fixed on the cylindrical member in a manner that can deform in the axial direction of the cylindrical member to constitute an elastic member assembly. The above-mentioned cylindrical member of the above-mentioned elastic member assembly and the above-mentioned valve main body are fitted from the above-mentioned axial direction, and the above-mentioned elastic member assembly is assembled in a state where the above-mentioned valve part is brought into contact with the above-mentioned valve seat by the urging force of the above-mentioned elastic member. Fixed to the above valve body.

The pressure-operated valve according to claim 2. The pressure-operated valve according to claim 1, wherein the cylindrical member of the elastic member assembly and the valve main body are screwed together with an internal thread and an external thread centered on the axis, Thereby, the said cylindrical member and the said valve main body are fitted.

The pressure-operated valve according to claim 3. The pressure-operated 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 on the valve body, and the valve part is A valve body slidable in the axial direction in the valve insertion hole is biased toward the elastic member.

The pressure-operated valve according to claim 4 is the pressure-operated valve according to claim 3, wherein the valve body is formed by integrating a valve stem and a ball valve, and the valve stem is arranged in the above-mentioned valve chamber and the insertion hole. On the elastic member side, the ball valve is disposed on the valve seat side, and the ball valve can be in contact with the valve seat.

A pressure-operated valve according to claim 5 is the pressure-operated valve according to claim 1 or 2, wherein the valve seat is disposed in the pressure chamber, and a central flat portion of the elastic member is used as the valve portion.

The method of setting the set pressure of the pressure-operated valve according to claim 6 is a method of setting the set pressure of the pressure-operated valve comprising: The valve main body of the valve port of the joint; a cylindrical cylindrical member centered on the axis of the valve port; an elastic member disposed opposite to the cylindrical space of the cylindrical member and deformable in the direction of the axial direction; and a valve portion that makes the valve port in a closed state by contacting the valve seat around the valve port with the force of the elastic member, and the elastic member is deformed by the pressure of the pressure chamber, so that the valve portion makes the valve port is in the valve-open state, the setting method of the above-mentioned set pressure sets the set pressure at which the above-mentioned valve part of the pressure-operated valve starts to separate from the above-mentioned valve seat, and the setting method of the above-mentioned set pressure is characterized in that the above-mentioned elastic The components are fixed on the cylindrical member in a manner deformable in the axial direction of the cylindrical member to form an elastic member assembly, and the elastic member assembly and the valve main body are set according to the relative displacement in the axial direction. Determine the above-mentioned set pressure of the above-mentioned pressure-operated valve.

The effects of the present invention are as follows.

According to the pressure-operated valve of claim 1, by adjusting the relative displacement in the axial direction between the elastic member assembly and the valve main body in the state where the cylindrical member of the elastic member assembly is fitted to the valve main body, it is possible to adjust the valve according to the displacement. Since the set pressure can be adjusted, the set pressure can be easily set.

According to the pressure-operated valve of claim 2, in addition to the effect of claim 1, when setting the set pressure, the elastic member assembly is screwed into the valve main body by screwing the internal thread and the external thread, so that The set pressure can be adjusted by the amount, so the set pressure can be set with high precision.

According to the pressure-operated 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 can be reliably closed.

According to the pressure-operated valve of solution 4, in addition to the effect of solution 3, the valve port can be reliably closed by utilizing the centripetal action of the ball valve on the valve seat.

According to the pressure-operated valve of Claim 5, in addition to the effects of Claims 1 and 2, since the valve port is directly opened and closed by the flat portion of the elastic member, the number of parts is also reduced and the structure is simple.

According to the setting method of the set pressure of the pressure-operated valve according to the plan 6, the same as the plan 1, by adjusting the relative displacement of the elastic member assembly and the valve body in the axial direction, the set pressure can be adjusted according to the displacement. It is possible to set the set pressure easily.

Description of drawings

Fig. 1 is a longitudinal sectional view of a pressure-operated valve according to a first embodiment of the present invention.

2 is an enlarged plan view and an enlarged cross-sectional view showing the detailed structure of the diaphragm of the pressure-operated valve according to the embodiment before assembly.

Fig. 3 is a longitudinal sectional view of a pressure-operated valve according to a second embodiment of the present invention.

Fig. 4 is a diagram showing another example of a valve body applied to the pressure-operated valve of the first embodiment.

In the picture:

1—valve body, 1a—external thread, 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 component assembly, 41—diaphragm (elastic component), 42—lower cover (cylindrical component), 42a —Internal thread, A1—pressure chamber, 5—valve body, 5a—external thread, 51a—primary side joint, 52a—secondary side joint, 53—valve port, 53a—valve seat, 6—elastic component assembly , 61—diaphragm (elastic component), 61b—flat portion (valve portion), 62—lower cover (cylindrical component), 62a—internal threaded portion, A2—pressure chamber.

Detailed ways

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

The valve chamber 14, the valve insertion hole 14a, and the spring chamber 16 are formed by passing through the end of the valve main body 1 opposite to the secondary side port 12. The valve body 2 of the "valve part". The valve body 2 is composed of a ball valve 21 and a cylindrical valve stem 22 , and the ball valve 21 is fitted and fixed in the centering recess 22 a at the end of the valve stem 22 . The spring chamber 16 is formed as an annular 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 flange-shaped spring holder 22b is fixed to the valve stem 22, and the coil spring 3 is compressed between the bottom of the spring chamber 16 and the spring holder 22b. As a result, the coil spring 3 biases the valve body 2 toward a diaphragm 41 , which will be described later, and presses the valve stem 22 toward the diaphragm 41 . The valve insertion hole 14a (and the valve chamber 14) has a cylindrical shape corresponding to the valve stem 22, and the valve stem 22 can slide accurately in the axis L direction in the valve insertion hole 14a. In addition, if the force exerted by the coil spring 3 on the spring bracket 22b is F, the primary side pressure when the valve is closed is PD, the secondary side pressure is Ps, and the cross-sectional area of the valve port 13 is S, the elastic force of the coil spring 3 is set to F<(PD-Ps)×S, and when the diaphragm 41 deforms as described later, the valve body 2 can move in the direction of the axis L accordingly. Relatively weak elasticity.

The elastic member assembly 4 is attached to the side of the valve main body 1 opposite to the secondary-side joint 12a. The elastic member assembly 4 includes a diaphragm 41 as an “elastic member”, a lower cover 42 as a “cylindrical member”, and a disc-shaped upper cover 43 . In addition, the diaphragm 41 , the lower cover 42 , and the upper cover 43 are integrally fixed by welding at the outer peripheral portion indicated by the dotted line ellipse in FIG. 1 .

FIG. 2 is an enlarged plan view and an enlarged cross-sectional view showing the detailed structure of the diaphragm 41 before assembly. The diaphragm 41 is a disk-shaped rotating body with the axis L as the center of rotation, and is composed of a metal leaf spring. It also has: a conical portion 41a having a truncated conical and slightly spherical surface; a flat portion 41b located in the center of the inner side of the conical portion 41a; and a flange portion 41c located on the outer periphery of the conical portion 41a.

The lower cover 42 as a "cylindrical member" is formed in a substantially cylindrical shape centered on the axis L, and the diaphragm 41 is arranged opposite to the cylindrical space inside it. The valve body 1, the diaphragm 41, and the lower cover 42 delimits pressure chamber A1 communicating with spring chamber 16 . In addition, the diaphragm 41 is deformable in the axis L direction with respect to the lower cover 42 . The pressure chamber A1 communicates with the primary side joint 11 a via the spring chamber 16 , the pressure equalization hole 17 , and the primary side port 15 .

An externally threaded portion 1 a centered on the axis L is formed on the upper outer periphery of the valve main body 1 , and an internally threaded portion 42 a centered on the axis L is formed on the inner peripheral surface of the lower cover 42 . Then, the elastic member assembly 4 is attached to the valve main body 1 by screwing the internal thread portion 42 a of the lower cover 42 to the external thread portion 1 a of the valve main body 1 . In addition, the elastic member assembly 4 and the valve main body 1 are fixed to the welding portion 421 at the lower end of the lower cover 42 . In addition, the valve main body 1 and the lower cover 42 are sealed by a sealing member such as an O-ring 18 or PTFE (polytetrafluoroethylene) arranged inside the welding portion 421 .

According to the above structure, the fluid flows in from the primary side joint 11a, and the fluid passes through the gap between the primary side port 15, the valve insertion hole 14a and the valve stem 22, the pressure equalizing hole 17, the spring chamber 16, and the pressure chamber A1 to the diaphragm. 41 Apply pressure. When the pressure is below the set pressure, the diaphragm 41 is not deformed, but the valve rod 22 is pushed by the acting force of the diaphragm 41, and the ball valve 21 is pushed to the valve seat 13a around the valve port 13, becoming The closed valve state of Figure 1. In addition, the fluid flowing in from the primary side joint 11a flows into the valve chamber 14 through the primary side port 15, but in the state shown in FIG.

On the other hand, if the pressure of the fluid becomes higher 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 on the axis L due to the elastic force of the coil spring 3 . direction to move. 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 starts to flow from the valve port 13 to the secondary side joint 12a. Furthermore, 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 to the secondary side joint 12a increases.

The upper cover 43 of the elastic member assembly 4 is formed with a jig hole 43a. Before the lower cover 42 is fixed by the welding portion 421, the elastic member can be assembled by engaging the jig in the jig hole 43a and rotating the elastic member assembly 4. The body 4 moves in the direction of the axis L relative to the valve body 1 . That is, the elastic member assembly 4 is screwed into the valve main body 1, and the diaphragm 41 is brought into contact with the valve body 2 (valve stem 22) by the urging force of the diaphragm 41 . By adjusting the amount of screw-in (relative displacement between the elastic member assembly 4 and the valve body 1), the force of the diaphragm 41 pressing the valve body 2 can be adjusted, so that the opening of the valve port 13 can be adjusted according to the pressure of the pressure chamber A1. The pressure, that is, the set pressure.

In addition, when adjusting the set pressure, a fluid having a pressure corresponding to the target set pressure is supplied from the primary side joint 11a, and the elastic member assembly 4 is screwed in, at the time when the valve port 13 is in the closed state (from When the fluid does not flow out from the secondary side joint 12a), the screwing operation of the elastic member assembly 4 is stopped. Then, the elastic member assembly 4 and the valve main body 1 are fixed to the welding portion 421 . In this manner, by adjusting the relative displacement between the elastic member assembly 4 and the valve main body 1 in the axis L direction, the setting work for adjusting the set pressure becomes easy. The adjustment of the set pressure can also be performed by temporarily screwing in the elastic member assembly 4 by a predetermined amount to close the valve, supplying fluid with a pressure corresponding to the target set pressure from the primary side joint 11a, and gradually The thread is loosened, and when the valve port 13 is in the open state (when the fluid starts to flow out from the secondary side joint), the threading operation of the elastic member assembly 4 is stopped, and welding is performed.

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 can be reliably closed by utilizing the centripetal action of the ball valve 21 relative to the valve seat 13a. . In addition, since the valve rod 22 is slid in the valve insertion hole 14a, the valve body 2 slides accurately along the axis L, and the valve opening accuracy in the valve open state can be improved.

In the above-mentioned first embodiment, the valve body 2 includes the ball valve 21 and the valve stem 22 , but may be, for example, a valve body as shown in FIG. 4 . Any valve body has a cylindrical portion corresponding to the above-mentioned valve rod 22 . In addition, the valve body of FIG. 4(A) is a valve body in which the lower end on the side of the valve port is spherical. The valve body of FIG. 4(B) is a valve body in which the lower end on the side of the valve port is shaped like a needle. The valve body of FIG. 4(C) is a valve body in which the lower end on the valve port side is a flat surface that comes into contact with the valve seat 13a.

Fig. 3 is a longitudinal sectional view of a pressure-operated valve according to a second embodiment. The pressure-operated valve of this embodiment has a valve main body 5 having a substantially cylindrical shape. 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 main body 5 . A primary-side joint 51 a through which a fluid flows in as indicated by an arrow is attached to the pipe connection hole 51 , and a secondary-side joint 52 a through which a fluid flows out as indicated by an arrow is attached to the pipe connection hole 52 . In addition, the primary side joint 51a and the secondary side joint 52a are integrally assembled with the valve main body 5 by brazing. Furthermore, the valve port 53 is a hole having a circular cross-section centered on the axis L. As shown in FIG.

An elastic member assembly 6 is attached to the outer periphery of the valve main body 5 . The elastic member assembly 6 includes a diaphragm 61 as an “elastic member”, a lower cover 62 as a “cylindrical member”, and a disc-shaped upper cover 63 . Further, the diaphragm 61 , the lower cover 62 , and the upper cover 63 are integrally fixed by welding at the outer peripheral portion indicated by the dotted line ellipse in FIG. 1 .

The diaphragm 61 is the same as the diaphragm 41 shown in FIG. 2 above, and is a disk-shaped rotating body with the axis L as the center of rotation, and is composed of a metal leaf spring. It also has: a conical portion 61a having a slightly spherical surface in the shape of a truncated cone; a flat portion 61b serving as a “valve portion” located in the center of the inner side of the conical portion 61a; and a flange portion 61c located on the outer periphery of the conical portion 61a. .

The lower cover 62 as a "cylindrical member" is formed in a substantially cylindrical shape with the axis L as the center, and the diaphragm 61 is arranged opposite to the cylindrical space inside it. The valve body 5, the diaphragm 61, and the lower cover 62 delimits pressure chamber A2. In addition, the diaphragm 61 is deformable in the axis L direction with respect to the lower cover 62 . The pressure chamber A2 communicates with the primary side joint 51 a via the primary side port 54 . In addition, the valve port 53 communicates with the secondary side joint 52 a via the secondary side port 55 . The periphery of the valve port 53 on the side of the pressure chamber A2 serves as 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.

An external thread portion 5 a centered on the axis L is formed on the upper outer periphery of the valve body 5 , and an internal thread portion 62 a centered on the axis L is formed on the inner peripheral surface of the lower cover 62 . Then, the elastic member assembly 6 is attached to the valve main body 5 by screwing the internal thread portion 62 a of the lower cover 62 and the external thread portion 5 a of the valve main body 5 . In addition, the elastic member assembly 6 and the valve main body 5 are fixed to the welding portion 621 at the lower end of the lower cover 62 . In addition, the valve body 5 and the lower cover 62 are sealed by the O-ring 58 disposed on the inner side of the welding portion 621 .

According to the above configuration, fluid flows in from the primary side joint 51a, and this fluid applies pressure to the diaphragm 61 through the primary side port 54 and the pressure chamber A2. When the pressure is 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 force of the diaphragm 61, and the valve is in the closed state of FIG. 3 . Accordingly, 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, the pressure of the fluid increases, and when the pressure of 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. Furthermore, as the pressure of the pressure chamber A2 increases, the distance between the flat portion 61b and the valve seat 53a increases, and the amount of fluid flowing to the secondary side joint 52a increases.

The upper cover 63 of the elastic member assembly 6 is formed with a jig hole 63a. Before the lower cover 62 is fixed by the welding portion 621, the elastic member assembly can be made 6 moves in the axis L direction relative to the valve body 5 . That is, the elastic member assembly 6 is screwed into the valve main body 5, and the diaphragm 61 is brought into contact with the valve seat 53a by the force of the diaphragm 61 . By adjusting the amount of screwing (relative displacement between the elastic member assembly 6 and the valve main body 1), the force with which the flat portion 61b of the diaphragm 61 presses the valve seat 53a can be adjusted, so that the valve can be adjusted according to the pressure of the pressure chamber A2. The pressure at which the port 53 starts to open, that is, the set pressure.

In this 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 elastic member assembly 6 is screwed into the valve port 53 to be in a closed state. At the timing (when the fluid does not flow out from the secondary side joint 52a), the screwing operation of the elastic member assembly 6 is stopped. Then, the elastic member assembly 6 and the valve main body 5 are fixed to the welding portion 621 . In this way, by adjusting the relative displacement in the axial line L direction of the elastic member assembly 6 and the valve main body 5, the setting work of adjusting the set pressure becomes easy.

In this 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 also reduced compared to the first embodiment, and the structure is simple.

As described above, in each embodiment, when setting the set pressure, the elastic member assembly (4, 6) is screwed into the valve main body (1, 5) by screwing the internal thread and the external thread. The screw-in amount adjusts the set pressure, so the set pressure can be set with high precision.

In each of the above embodiments, an example in which an external thread portion is formed on the valve main body side and an internal thread portion is formed on the elastic member assembly side has been described, but it is also possible to form an internal thread portion on the inner side of the valve body and to form an internal thread portion on the elastic member assembly side. An external thread portion is formed on the outside of the elastic member assembly, and the elastic member assembly is attached to the valve main body by screwing the internal thread portion and the external thread portion.

In addition, in each embodiment, the elastic member assembly and the valve main body are fitted by screwing the external thread portion and the internal thread portion, but it may be configured such that there is no external thread portion and internal thread portion, and the elastic The cylindrical portion of the component assembly and the valve main body are respectively formed with cylindrical surfaces that fit into each other in the axial direction, and these cylindrical surfaces are fitted into each other in the axial direction. In this case, when adjusting the set pressure, use a jig that holds the elastic member assembly and the valve main body, and adjust the elastic member assembly and the valve body while supplying fluid at a pressure corresponding to the target set pressure from the primary side joint. The relative displacement amount in the axial direction of the main body is fixed when the valve port is in the closed state. Then, at the welding portion, the elastic member assembly and the valve main body are fixed. In this way, the setting work of adjusting the set pressure becomes easy.

In addition, in each embodiment, the case where the elastic member is a diaphragm has been described, but the elastic member may be a bellows or the like.

Claims (6)

1. A pressure-operated valve comprising: a valve main body formed with a valve port allowing fluid flowing in from a primary side joint to flow to a secondary side joint; an elastic member deformable in the axial direction of the valve port; and Cylindrical cylindrical part as the center, The valve main body, the elastic member, and the cylindrical member define a pressure chamber communicating with the primary side joint. The valve seat around the valve port abuts to make the valve port in a closed state. When the pressure in the pressure chamber exceeds the set pressure, the elastic member deforms, and the valve part is separated from the valve seat to make the valve port open. valve status, The above-mentioned pressure-operated valve is characterized in that, The elastic member is fixed to the cylindrical member in a deformable manner in the axial direction of the cylindrical member to form an elastic member assembly, and the cylindrical member and the above-mentioned elastic member assembly of the elastic member assembly are fitted from the axial direction. In the valve main body, the elastic member assembly is fixed to the valve main body in a state where the valve portion and the valve seat are brought into contact by the biasing force of the elastic member. 2. The pressure-operated valve of claim 1, wherein: The cylindrical member and the valve body of the elastic member assembly are fitted by screwing the internal thread and the external thread around the axis. 3. A pressure operated valve according to claim 1 or 2, characterized in that, A valve chamber and a valve insertion hole communicating from the valve port to the pressure chamber are formed on the valve main body. The valve portion is a valve body that can slide in the axial direction in the valve insertion hole. The elastic member side is biased. 4. The pressure-operated valve of claim 3, wherein: The valve body is constituted integrally with a valve stem and a ball valve. In the valve chamber and the insertion hole, the valve stem is arranged on the side of the elastic member, and the ball valve is arranged on the side of the valve seat. The ball valve can be connected to the valve seat. Abut. 5. A pressure operated valve according to claim 1 or 2, characterized in that, The valve seat is disposed in the pressure chamber, and the central flat portion of the elastic member is used as the valve portion. 6. A method for setting a set pressure of a pressure-operated valve, which is a method for setting the set pressure of a pressure-operated valve comprising: The valve main body of the valve port of the secondary side joint; the cylindrical cylindrical member centered on the axis of the valve port; the cylindrical space facing the cylindrical member and deformable in the axial direction an elastic member; and a valve part that uses the force of the elastic member to abut against the valve seat around the valve port so that the valve port is in a closed state, and the elastic member is deformed by the pressure of the pressure chamber, so that the valve part Make the above valve port in the open state, The method of setting the set pressure of the pressure-operated valve sets the set pressure at which the valve part of the pressure-operated valve starts to separate from the valve seat, The method for setting the set pressure of the above-mentioned pressure-operated valve is characterized in that: 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. According to the relative displacement of the elastic member assembly and the valve body in the axial direction, , to set the above-mentioned setting pressure of the above-mentioned pressure-operated valve.