JP5017374B2 - Pressure regulating valve - Google Patents

Description

  The present invention relates to a pressure regulating valve capable of limiting an upper limit of pressure to be adjusted.

  Conventionally, a valve seat formed between an inflow side channel into which the primary fluid flows in and an outflow channel from which the secondary fluid flows out is deformed by the pressure of the primary fluid or the secondary fluid. As a pressure adjusting valve that adjusts the pressure by opening and closing with a valve body that interlocks with the diaphragm, a back pressure valve that adjusts the pressure of the primary fluid and a pressure reducing valve that adjusts the pressure of the secondary fluid are used. (For example, refer to Patent Document 1).

  In the case of a pressure reducing valve configured as described above, for example, in the case of a pressure reducing valve, when the pressure of the secondary side fluid decreases, the valve body separates from the valve seat and the inflow side flow path and the outflow side flow path communicate with each other. The fluid flows from the primary side to the secondary side, and the set pressure is adjusted by adjusting the expansion / contraction state of the spring that presses the diaphragm.

Regarding such a pressure regulating valve, for example, JISB6803 (equivalent to ISO 2503) stipulates that when acetylene gas is handled, it should be designed and manufactured so that the pressure on the secondary side does not exceed 0.15 MPa. When handling, it is specified that the spring should be in close contact with the pressure adjusting handle so that it does not become a rod shape.
Japanese Patent Laid-Open No. 7-12245

However, for example, when the adjustment handle of the pressure adjustment valve is detached, if the adjustment handle of another pressure adjustment valve with a different screw length is attached instead of the predetermined handle and the diaphragm is pressed too much, the pressure to be adjusted There is a problem that the upper limit may change and the upper limit pressure may not be reliably restricted.
In addition, when trying to limit the compression length of the spring, it is common that the structure becomes complicated and the number of parts increases, so that the processing cost and assembly cost increase and the upper limit pressure is limited to a predetermined pressure. There was a problem that adjustment might be necessary.

  The present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a pressure regulating valve capable of limiting the upper limit of the fluid adjustable pressure to a predetermined upper limit pressure with a simple structure. And

In order to solve the above problems, the present invention proposes the following means.
The present invention includes a cap having an opening at one end and a wall at the other end, and a female screw formed on the wall, and an inflow channel disposed on the opening of the cap. A housing having an outflow side flow path, and a valve seat formed between the inflow side flow path and the outflow side flow path, and disposed between the cap and the housing; A diaphragm that can be deformed by the fluid pressure on the outflow side flow path side, a valve body that moves in conjunction with the deformation of the diaphragm, opens and closes the valve seat, and is disposed in the cap, and one end side in the axial direction of the diaphragm A spring to be pressed, a pressing member disposed on the other end side in the axial direction of the spring, and screwed into the female screw so as to be able to advance and retract, and adjusts the pressing force of the spring via the pressing member Adjustment The cap is formed integrally with the wall portion, and extends through the peripheral wall portion in the expansion and contraction direction of the spring and penetrates the inside and the outside of the cap. The opening of the cap is in contact with a contact piece formed on the pressing member so that the adjustment screw cannot be advanced and the spring is compressed by a predetermined amount or more. This is a first contact portion that restricts the above.

According to the pressure regulating valve according to the present invention, when adjusting the set pressure of the fluid, the pressing member is brought into contact with the first abutting portion so that the adjustment screw cannot be advanced, and the pressing member causes the diaphragm to move. Pressing beyond the pressing force corresponding to the upper limit pressure is restricted, and the upper limit of the fluid pressure adjusted by the tightening of the adjusting screw is prevented from exceeding the predetermined upper limit pressure, and the adjusting screw is tightened too much This can prevent the spring from sticking.
Further, since the first contact portion is formed in the through hole of the cap, it is easy to assemble the pressing member to the cap, and the operating state of the spring can be easily confirmed from the outside of the cap.
In addition, a female screw is formed on the wall provided on the other end of the cap, and the wall and the abutment are formed integrally with the cap, so that the extension range of the spring can be accurately adjusted and the upper limit pressure can be adjusted. Can be reliably maintained.
Further, since the wall portion is formed integrally with the cap, the pressing member can be prevented from coming out of the cap.

  In the pressure regulating valve, the through hole has a second abutting portion for restricting the other end side from abutting a contacted piece formed on the pressing member and restricting the spring from being extended by a predetermined amount or more. It may be said.

  According to the pressure adjustment valve of the present invention, the contact piece is in contact with the first contact portion and the second contact portion and the expansion / contraction stroke of the spring is limited. Can be limited within a predetermined range.

  In the pressure regulating valve, the pressing member may be provided on an inner periphery of the spring, and may include a convex portion that restricts lateral displacement of the spring.

  According to the pressure regulating valve according to the present invention, since the pressing member includes the convex portion that is disposed on the inner periphery of the spring and restricts the lateral displacement of the spring, the spring can be stably expanded and contracted. Maintenance and pressure adjustment can be performed stably.

  According to the pressure regulating valve according to the present invention, the pressing member can be prevented from coming out of the cap, and the pressure of the fluid can be surely limited to a predetermined upper limit pressure or less.

It is a longitudinal section showing a pressure-reduction valve concerning one embodiment of the present invention. It is a figure which shows the outline of the cap and press member of the pressure-reduction valve which concern on one Embodiment of this invention. It is a figure which shows the III-III cross section in FIG. It is a side view which shows the outline of the press member which concerns on one Embodiment of this invention. It is a figure which shows the effect | action of the pressure-reduction valve which concerns on one Embodiment of this invention, and is a longitudinal cross-sectional view which shows the state which the press member is not contacting the 1st contact part. It is a figure which shows the effect | action of the pressure-reduction valve which concerns on one Embodiment of this invention, and is a longitudinal cross-sectional view which shows the state which the press member is contacting the 1st contact part.

Explanation of symbols

DA Press member maximum diameter 1 Pressure reducing valve (pressure adjusting valve)
DESCRIPTION OF SYMBOLS 10 Housing 12 Inflow path 14 Outflow path 202 Cap 20A Opening part 20B Wall part 25B 1st contact part 25C 2nd contact part 26 Female screw 32 Diaphragm 33 Adjustment spring 36 Adjustment screw 39 Press member 39A, 39B Contacted Fragment

Hereinafter, the pressure reducing valve 1 will be described with reference to FIGS. 1 to 5B.
FIG. 1 is a view showing a pressure regulating valve according to an embodiment of the present invention. Reference numeral 1 is, for example, a pressure reducing valve (pressure regulating valve) for reducing the pressure of acetylene gas, and an upper limit pressure is 0.15 MPa. It is supposed to be.

As shown in FIG. 1, the pressure reducing valve 1 includes a housing 10, a cap 202, a pressure adjustment mechanism 30, and a handle 40, and the pressure adjustment mechanism 30 includes a valve body 31, a diaphragm 32, an adjustment spring ( A spring) 33, a tray 34, a pressing member 39, an adjustment screw 36, and a rod 37.
The housing 10 is connected to the opening 20 </ b> A side of the cap 202, and a diaphragm 32 is disposed between the housing 10 and the cap 202.

  The housing 10 is made of a metal such as brass, for example, an inflow side channel 12 into which the primary side fluid flows, an outflow side channel 14 from which the secondary side fluid flows out, and the inflow side channel 12 and the outflow side flow. A communication channel 16 that communicates with the passage 14 and a recess 17 are formed, and the recess 17 communicates with the outflow channel 14 through a pilot hole 14C.

  The inflow side flow path 12 includes, for example, a first inflow side flow path 12A in which a female screw for connecting a joint or the like is formed, and one end opening to the outside of the housing 10, and a first inflow side flow path 12A A second inflow side channel 12 </ b> B communicating with the communication channel 16.

  The outflow side flow path 14 includes, for example, a first outflow side flow path 14A formed with a female screw for connecting a joint or the like and one end opening to the outside of the housing 10, and a second outflow side flow path 14A. A second outflow side channel 14B communicating with the communication channel 16 is provided.

  The communication channel 16 is disposed coaxially with the axis O1 of the adjustment spring 33, and includes, for example, a large-diameter hole 16A and a small-diameter hole 16B having a circular cross section, and the large-diameter hole 16A and the small-diameter hole 16B are connected to each other. At the bottom of the hole 16A, an annular protrusion is formed that protrudes from the peripheral edge of the small diameter hole 16B toward the large diameter hole 16A. The annular protrusion is a valve seat 16C that is opened and closed by the valve body 31.

  The large-diameter hole 16A houses a valve body 31 and a pressing spring 19 in order from the valve seat 16C. The valve body 31 is movable in the direction of the axis O1 and is pressed toward the valve seat 16C by the pressing spring 19 to The valve seat 16C can be opened and closed by the body 31.

  The small-diameter hole 16B is formed so as to communicate the large-diameter hole 16A and the concave portion 17, and the rod 37 is accommodated in the small-diameter hole 16B so as to be movable in the direction of the axis O1. A part of the flow path communicating with the path 14 is formed.

  The recess 17 opens to the cap 202 side and is covered with the diaphragm 32, and the pressure of the secondary fluid flowing into the recess 17 through the pilot hole 14 </ b> C is applied to the diaphragm 32. .

As shown in FIGS. 2 and 3, the cap 202 includes a pressing member storage portion 24B and a spring storage portion 28B formed of a first concave portion 21B having a cylindrical shape, and the peripheral wall portion of the pressing member storage portion 24B is symmetrical to the axis O1. A pair (two) of through-holes 202A having a width W1 extending in the direction of the axis O1 is formed, and a first contact portion 25B is formed on the wall surface of the through-hole 202A on the opening 20A side (the other end side). .
The wall surface on the side (one end side) facing the contact portion 25B in the direction of the axis O1 of the through hole 202A is the second contact portion 25C.

  The cap 202 has a substantially bottomed multistage cylindrical shape in which one end side is an opening portion 20A and a wall portion 20B is formed on the other end side to be closed, and the adjustment spring 33 is accommodated on the inner peripheral side. A recess 21 and a second recess 22 positioned on the opening 20A side of the first recess 21 and having a larger diameter than the first recess 21 are provided. The housing 10 is provided on the opening 20A side of the second recess 22. A screw is formed to connect with.

The wall portion 20B is integrally formed as a part of the cap 202 by, for example, machining by casting or machining, and a female screw 26 coaxial with the axis O1 of the adjustment spring 33 is formed at the central portion. The adjustment screw 36 is screwed together.
The female screw 26 is formed integrally with the cap 202 by, for example, machining the wall portion 20B.

  The female screw 26 may be configured by mounting a member other than the wall portion 20B and the threaded wall portion 20B so as not to be inserted into or removed from the wall portion 20B. The hole for providing the member in which the member 26 is formed is formed in such a size and shape that the pressing member 39 does not come out of the cap 202 even when the member is dropped.

The diaphragm 32 is an elastic circular flat plate-like metal plate that can be swelled in a direction perpendicular to the flat plate-like surface, and is connected to a valve body 31 or a rod 37 for interlocking with a central portion. In addition, the outer peripheral edge portion is sandwiched between the housing 10 and the cap 202 and is disposed so as to cover the opening of the concave portion 17 of the housing 10.
The diaphragm 32 is swelled in the axial direction by the pressure in the recess 17 communicating with the outflow side flow path 14 through the pilot hole.

  The adjustment spring 33 can be expanded and contracted in the direction of the axis O1 and is accommodated in the spring accommodating portion 28B. One end side is supported by the diaphragm 32 via the tray 34 and the other end side is supported by the adjustment screw 36 via the pressing member 39. Has been.

Further, the adjustment spring 33 expands when the pressure of the secondary side fluid is lowered and swells the diaphragm 32 toward the concave portion 17 and is compressed when the pressure of the secondary side fluid increases. The deformation of the diaphragm 32 is transmitted to the valve body 31 via the connecting member 32A and the rod 37.
As a result, the valve body 31 moves in conjunction with the deformation of the diaphragm 32 to open and close the valve seat 16C.

  The saucer 34 has a wall portion that is circular in plan view and has a peripheral edge that rises gently. The saucer 34 is disposed on the adjustment spring 33 side of the diaphragm 32, receives one end side of the adjustment spring 33, and sandwiches the diaphragm 32. It is attached to the diaphragm 32 by a screw of a connecting member 32A arranged on the opposite side.

As shown in FIG. 4, the pressing member 39 has a multi-stage disk shape having a small-diameter convex portion 35A, and a substantially conical concave portion that supports the support convex portion 36A of the adjusting screw 36 on the end surface opposite to the small-diameter convex portion 35A. 35B is formed, and the inner circumference on the other end side of the adjustment spring 33 can be arranged on the outer circumference of the small-diameter convex portion 35A.
Further, a pair (two) of contact pieces 39A and 39B having a width W2 extending radially outward are formed at positions symmetrical to the center of the pressing member 39 described above. The contact piece 39A and the contact piece 39B may have different shapes, but in this embodiment, they have the same shape.
The contact pieces 39A and 39B of the pressing member 39 are in contact with the first contact portion 25B formed in the through hole 202A so that the adjustment spring 33 is restricted from being compressed by a predetermined amount or more. It has become.

  Further, the pressing member storage portion 24B has such a size that the pressing member 39 can press the adjustment spring 33 in the direction of the axis O1, that is, the axis of the pressing member 39 can change the posture in the direction of the axis O1.

For example, the maximum diameter DA of the pressing member 39, the thickness LA of the maximum diameter DA portion, the length LC connecting the outer peripheries (maximum dimension portions) of the contacted pieces 39A and 39B, the width W2, and the inner peripheral wall of the cap 202 The minimum diameter (corresponding to the inner diameter of the spring accommodating portion 28B) D21 and the width W1 of the through hole 202A are:
DA <D21 <LC
And
W2 <W1
It is said that.

The length LC is related to the length of the through hole 202A in the direction of the axis O1. When the pressing member 39 is inserted into the first recess 21B in an oblique manner as shown in FIG. When the piece 39A is inserted into one through hole 202A and comes into contact with the second contact portion 25C, the other contacted piece 39B becomes the inner periphery of the first contact portion 25B of the other through hole 202A. It is set so that it can pass through the side smallest diameter part.
Further, the pressing member 39 has a maximum diameter DA of a disc-shaped portion excluding the contact pieces 39A and 39B, a thickness of the maximum diameter DA portion is LA, a small-diameter convex portion 35A has an outer diameter DB, The thickness of the small-diameter convex portion 35A is LB.

  As a result, the pressing member 39 can be stored in the pressing member storage portion 24B from the opening 20A side, and the contact pieces 39A and 39B are inserted into the through holes 202A in a posture of pressing the adjustment spring 33. When the adjustment spring 33 is moved in the compressing direction by the adjustment screw 36, the adjustment spring 33 is compressed by a predetermined amount or more by contacting the first contact portion 25B. Is being restricted.

  The adjustment screw 36 includes a substantially conical support convex portion 36A whose diameter is reduced at the distal end, and is screwed into the female screw 26 so as to be able to advance and retreat in the direction of the axis O1 of the adjustment spring 33, and the support convex portion 36A. Is in contact with the recess 35B of the pressing member 39 to support the adjustment spring 33.

One end of the rod 37 is in contact with the valve body 31, and the other end is in contact with the connecting member 32 </ b> A of the diaphragm 32, so that the central portion of the diaphragm 32 bulges and deformed is transmitted to the valve body 31. .
In this embodiment, the rod 37 is in contact with the connecting member 32A and the valve body 31 to transmit the displacement due to the deformation of the diaphragm 32 to the valve body 31, but both or both of the connecting member 32A and the valve body 31 are used. It is good also as a structure connected with either.

  The handle 40 is formed with a concave portion in the longitudinal direction of the outer periphery, which has a substantially cylindrical shape with a bottom, and an adjustment screw 36 coaxial with the axis O1 is embedded inside the cylindrical shape in the center of the bottom, and the adjustment screw 36 is female. The adjustment screw 36 is advanced and retracted with respect to the female screw 26 by being screwed into the screw 26 and rotating the handle 40.

Next, the operation of the pressure reducing valve 1 will be described.
In the pressure reducing valve 1, when the pressure applied to the diaphragm 32 decreases, the valve body 31 is separated from the valve seat 16 </ b> C by the pressing force of the adjustment spring 33, and the valve seat 16 </ b> C is opened. Fluid flows through 14.
When the pressure applied to the diaphragm 32 becomes higher than a predetermined pressure, the adjustment spring 33 is compressed, and the valve body 31 comes into contact with the valve seat 16C by the pressing force of the pressing spring 19 to close the valve seat 16C. The flow of fluid from the inflow side channel 12 to the outflow side channel 14 is stopped.

The pressure adjustment of the pressure reducing valve 1 is performed by rotating the handle 40. When the adjusting screw 36 is rotated by moving the handle 40 to advance and retract, the support convex portion 36A causes the adjustment spring 33 to be moved via the pressing member 39. It expands and contracts in the direction of the axis O1.
When the support convex portion 36A moves forward and the adjustment spring 33 is compressed, the pressing force applied to the diaphragm 32 is increased, and the adjustment pressure of the secondary fluid is increased.
When the pressure of the secondary fluid is within the adjustment range, as shown in FIG. 5A, the contact pieces 39A and 39B of the pressing member 39 do not contact the first contact portion 25B, and the adjustment screw 36 Can advance and retreat.

In this embodiment, the handle 40 is rotated to loosen the adjustment screw 36. For example, when the support convex portion 36 </ b> A of the adjustment screw 36 is separated from the concave portion 35 </ b> B of the pressing member 39, The contact pieces 39A and 39B are in contact with the second contact portion 25C and the pressing member 39 is prevented from extending the adjustment spring 33 beyond a predetermined length.
As a result, by rotating the handle 40, the pressure of the secondary fluid of the pressure reducing valve 1 can be adjusted within a predetermined range.

Next, when the adjustment screw 36 is rotated by the handle 40 to advance the support convex portion 36A, the contact pieces 39A and 39B of the pressing member 39 are moved to the first contact portion 25B as shown in FIG. 5B. The adjustment screw 36 cannot be moved forward due to contact.
As a result, the handle 40 becomes unrotatable and the pressing member 39 cannot compress the adjustment spring 33, and the pressing member 39 that does not increase the pressing force on the diaphragm 32 contacts the first contact portion 25B. The pressure of the secondary fluid at the time of contact becomes the upper limit pressure of the secondary fluid, and the pressure of the secondary fluid is prevented from further increasing.

  Further, since the pressing member 39 does not come out of the cap 202, it becomes impossible to adjust the pressure of the secondary fluid by the adjustment screw 36 being loosened too much or the diaphragm 32 being not pressed even if the adjustment screw 36 is removed. Is prevented.

  Further, the pressing member 39 is formed with a small-diameter convex portion 35A, and the small-diameter convex portion 35A is arranged on the inner periphery of the adjusting spring 33, so that the other end side of the adjusting spring 33 and the pressing member 39 are axial. The adjustment spring 33 can be stably expanded and contracted by suppressing the relative displacement in the direction orthogonal to O1. As a result, the pressure of the secondary fluid can be adjusted stably.

Conventionally, when the adjustment screw 36 is rotated to adjust the length of the adjustment spring 33, the rotation of the adjustment screw 36 is transmitted to the adjustment spring 33 through the pressing member 39 due to friction, and the axis O1 is transmitted to the adjustment spring 33. There is a possibility that the surrounding spring or a change with time due to the twist will occur, the compression force of the adjusting spring 33 may change, and the diaphragm 32 may be damaged by the twist.
Therefore, conventionally, for the purpose of suppressing the rotation of the adjusting screw 36 from being transmitted to the pressing member 39, the tip of the adjusting screw 36 is formed to be sharp or spherical to reduce the contact area with the pressing member 39, or However, in a pressure regulating valve such as a pressure reducing valve, the contact pieces 39A and 39B are inserted into the through hole 202A, and the rotation of the adjusting screw 36 is adjusted. Since it is not transmitted to the spring 33, the above-described conventional configuration is not required.

According to the cap 202, when the through-hole 202A constituting the first contact portion 25B is formed by machining such as cutting, it can be easily processed.
Further, the contact state of the contacted pieces 39A and 39B can be easily confirmed.

In the above embodiment, the case where the first recess 21B is formed in a cylindrical shape has been described. For example, a rib extending inward in the radial direction is formed on the inner periphery of the first recess 21B. A spring housing part may be formed inside the tip of the rib, and the maximum diameter DA of the pressing member 39 may be smaller than the inner diameter of the spring housing part.
In this case, the abutted pieces 39A and 39B can pass between adjacent ribs, and the pressing member 39 can be stored in the pressing member storage portion 24B more easily and efficiently.

In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning of invention.
In the above embodiment, the case where the pressure regulating valve is the pressure reducing valve 1 has been described. However, the pressure regulating valve may be applied to a back pressure valve instead of the pressure reducing valve 1.

  Further, in the above embodiment, a case where one end side of the through hole 202A formed in the cap 202 in the axis O1 direction is the first contact portion 25B and the other end side is the second contact portion 25C. Although demonstrated, it is good also as a structure by which the wall surface of the other end side is not made into the 2nd contact part 25C, for example.

  Moreover, in the said embodiment, although the valve body 31 was arrange | positioned in the communication flow path 16 which connects the inflow side flow path 12 and the outflow side flow path 14, and demonstrated the structure which opens and closes the valve seat 16C, a diaphragm was demonstrated. Needless to say, the present invention is applicable to various pressure regulating valves that move the valve body by 32 to open and close the valve seat.

  In the above-described embodiment, the case where the pressing member storage portion 24B, the spring storage portion 28B, and the pressing member 39 are circular in plan view when viewed from the direction of the axis O1 has been described. Other shapes such as a square may be used.

  In the above embodiment, the case where the gas handled by the pressure reducing valve 1 is, for example, acetylene gas has been described. However, as the fluid to be handled, an inert gas such as nitrogen or argon, hydrogen, methane, ethylene, or the like is used. In addition to gases such as flammable gas, supporting gas such as oxygen, and corrosive gas such as chlorine and sulfur dioxide, various fluids such as liquid containing water, acid or alkali can be targeted. .

  The diaphragm 32 has been described with respect to a case where the diaphragm 32 is made of a metal disk. However, in addition to metals such as stainless steel, other materials having elasticity such as a rubber film or a synthetic resin film may be used. Further, the shape is not limited to a disk-shaped flat plate. For example, when the annular rib is formed on the diaphragm 32 around the valve body 31, or a three-dimensional shape such as a spherical surface. The diaphragm 32 may be configured using a part thereof.

The present invention provides a cap in which one end side is an opening and a wall portion is provided on the other end side, and a female screw is formed on the wall portion, the cap is disposed on the opening side of the cap, A housing having an outflow side flow path, and a valve seat formed between the inflow side flow path and the outflow side flow path, and disposed between the cap and the housing; A diaphragm that can be deformed by the fluid pressure on the outflow side flow path side, a valve body that moves in conjunction with the deformation of the diaphragm, opens and closes the valve seat, and is disposed in the cap, and one end side in the axial direction of the diaphragm A spring to be pressed, a pressing member disposed on the other end side in the axial direction of the spring, and screwed into the female screw so as to be able to advance and retract, and adjusts the pressing force of the spring via the pressing member Adjustment The cap is formed integrally with the wall portion, and has a through-hole extending in the expansion and contraction direction of the spring and penetrating the inside and the outside of the cap in the peripheral wall portion. The pressure that is formed, and the through hole is a first abutting portion that restricts the one end side from abutting with a contact piece formed on the pressing member and restricting the spring from being compressed by a predetermined amount or more. It relates to a regulating valve.
According to the present invention, the pressing member can be prevented from coming out of the cap, and the pressure of the fluid can be reliably limited to a predetermined upper limit pressure or less.

Claims (3)

A cap having one end side as an opening and a wall portion provided on the other end side, and a female screw formed on the wall portion;
A housing that is disposed on the opening side of the cap and has an inflow side flow path, an outflow side flow path, and a valve seat formed between the inflow side flow path and the outflow side flow path;
A diaphragm disposed between the cap and the housing and deformable by fluid pressure on the inflow side flow path side or the outflow side flow path side;
A valve body that moves in conjunction with deformation of the diaphragm and opens and closes the valve seat;
A spring disposed in the cap and having one end in the axial direction pressing the diaphragm;
A pressing member disposed on the other end side in the axial direction of the spring;
A pressure adjusting valve that is screwed into the female screw and is capable of moving forward and backward, and an adjusting screw that adjusts the pressing force of the spring via the pressing member;
The cap is formed integrally with the wall portion and has a through-hole formed in the peripheral wall portion extending in the expansion / contraction direction of the spring and penetrating the inside and the outside of the cap,
The through-hole restricts the spring from being compressed more than a predetermined amount by preventing the adjustment screw from moving forward when the opening side of the cap abuts against a contact piece formed on the pressing member. 1 is a pressure adjusting valve that is a contact portion of the first. The pressure regulating valve according to claim 1,
The through hole restricts the extension of the spring by a predetermined amount by contacting the contacted piece formed on the pressing member at the other end side, and adjusts the moving stroke of the spring. Pressure regulating valve that is in contact. The pressure regulating valve according to claim 1 or 2,
The pressure regulating valve, wherein the pressing member is disposed on an inner periphery of the spring and includes a convex portion that regulates lateral displacement of the spring.

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