JP2023063156A - regulator - Google Patents

Abstract

A regulator capable of preventing deformation of a valve seat without requiring strict dimensional accuracy control and nervous assembly. A regulator (1) for decompressing a high-pressure fluid to obtain a fluid adjusted to a desired pressure includes a body (10A) penetrating a passage (20) and a decompression chamber (23) formed by partitioning the passage (20). an air pressure chamber 24, a pressure regulating chamber 25, an inlet cover 30, an annular valve seat 100, a valve seat holding portion consisting of a fitting concave portion 26 and a fitting convex portion 33, a piston 50, a pressure regulating spring 60, The valve seat 100 has an annular groove 107 formed on its inner or outer peripheral surface. [Selection drawing] Fig. 1

Description

The present invention relates to a piston-type regulator used to reduce high-pressure fluid to a desired pressure, and more particularly to a valve seat structure.

Conventionally, a regulator, which is a device that reduces the pressure of a high-pressure fluid and adjusts it to a desired pressure, is widely known. However, there are two main types: the diaphragm type and the piston type.

Piston-type regulators are disclosed in, for example, Japanese Patent Application Laid-Open Nos. 2007-146875 (Patent Document 1), 2013-41375 (Patent Document 2), and 2019-67216 (Patent Document 3). A desired secondary pressure is set by adjusting the balance between the primary pressure applied to the piston and the secondary pressure that opposes it.

9 to 11 show an example of a piston-type regulator. This regulator 3 has one open end of a cylindrical passage 20 penetrating through a body 10A made of metal, hard synthetic resin, or the like. is an input side 21 for a high-pressure fluid, and the other open end is an output side 22 for a pressure-regulated fluid. 30 and an outlet cover 40 having an outlet 41 for airtightly withdrawing the fluid are secured by fasteners 32, 42 such as setscrews, respectively.

The passage 20 is divided into a decompression chamber 23, an atmospheric pressure chamber 24, and a pressure regulation chamber 25. After the high-pressure fluid introduced from the introduction port 31 is decompressed in the decompression chamber 23, it is It is discharged from the outlet 41 after being adjusted to a predetermined pressure.

A fitting recess 26 having an annular holding piece 27 is formed on the input side 21 of the passage 20, and a cylindrical fitting protrusion 33 protrudes from the entrance cover 30 on the side opposite to the introduction port 31. The fitting recess 26 and the fitting projection 33 constitute a valve seat holding portion, and between the fitting recess 26 and the fitting projection 33 is an elastic material such as resin or rubber. An annular valve seat 100 formed by is fitted and held while being pressed in the axial direction.

The output side 22 of the passage 20 includes a valve body 51 that contacts or separates from the valve seat 100, and is arranged to be slidable in the passage 20 in the axial direction. 24. A piston 50 that partitions the pressure regulating chamber 25 and a pressure regulating spring 60 that biases the piston 50 toward the output side 22 are provided.

In the regulator 3, in order to prevent the valve seat 100 from floating or shifting due to manufacturing tolerances, etc., and to prevent fluid leakage, the length of the fitting convex portion 33 is longer than that of the fitting concave portion 26. The valve seat 100 is formed longer than the length minus the thickness of the valve seat 100, and the valve seat 100 is held under a constant pressure by being pushed by the fitting convex portion 33. As shown in FIG.

However, in the annular valve seat 100 made of an elastic material, the outer portion 104 of the seat surface 102 contacting the valve body 51 , which is in contact with the annular holding piece 27 , cannot be deformed by the annular holding piece 27 . Since the inner part 105 which is supported but is not in contact with the annular holding piece 27 is deformable, the valve seat 100 is deformed in the direction of the valve body 51 by the pressing force of the fitting protrusion 33 . there was a case.

FIG. 11 is a view showing a state in which the valve seat 100 is deformed toward the valve body 51 by the pressing force of the fitting convex portion 33. When the seat surface 102 is thus deformed, the valve seat 100 is deformed. The contact with the valve body 51 becomes uneven, and there is a possibility that it may lead to functional loss due to leak failure or the like.

On the other hand, FIGS. 12 to 14 show an example of a piston type regulator similar to the example shown in FIGS. 9 to 11, but differ in the configuration of the valve seat holding portion for holding the valve seat and the piston. be.

That is, in this regulator 4, the valve seat 110 is held by a disk-shaped valve seat holding member 70 mounted between the inlet cover 30 and the body 10B, and the piston 80 contacts the valve seat 110. The configuration includes a cylindrical valve body 81 that opens and closes the fluid passage 83 by doing so.

For attaching the valve seat 110 to the valve seat holding member 70, the valve seat 110 is inserted into the valve seat holding hole 71, and the head portion 74 having a larger diameter than the central hole 111 of the valve seat 100 is inserted. By screwing the fixing screw 73 into the screw hole 72 , the valve seat 110 is held under a constant pressure by being pushed by the head 74 .

However, the ring-shaped valve seat 110 made of an elastic material causes the outer portion 114 of the seat surface 112 in contact with the valve body 81, which is not in contact with the head portion 74, to be displaced by the tightening force of the fixing screw 73. There was a case where it deformed in the direction of the valve body 81 .

FIG. 14 shows a state in which the valve seat 110 is deformed toward the valve body 81 by the tightening force of the fixing screw 74. When the seat surface 112 is deformed in this manner, the valve seat 110 and the valve are deformed. The contact with the body 81 becomes non-uniform, and there is a possibility that it may lead to functional loss due to leak failure or the like.

In the regulators 3 and 4, if the problem of valve seat deformation is to be avoided without changing the component configuration, the dimensional accuracy of each component must be strictly controlled, and the assembly must be time-consuming and laborious. , there was a problem of cost increase.

JP 2007-146875 A JP 2013-41375 A JP 2019-67216 A

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the conventional regulator, and provides a regulator capable of preventing deformation of the valve seat without requiring strict dimensional accuracy control or nervous assembly. The task is to

The present invention, which has been made to solve the above problems, is a regulator for obtaining a fluid adjusted to a desired pressure by decompressing a high-pressure fluid, comprising:
body and
a passage formed through the body and having one end on a fluid input side and the other end on a fluid output side;
a decompression chamber, an atmospheric pressure chamber, and a pressure regulation chamber formed by dividing the passage in order from the input side to the output side;
an annular valve seat provided at a position closer to the input side than the decompression chamber in the passage and having a center hole formed in the center thereof;
a valve seat holder that holds the valve seat while pressing it in the axial direction;
a piston that includes a valve body that contacts or separates from the valve seat, is disposed slidably in the passage in the axial direction, and defines the decompression chamber, the atmospheric pressure chamber, and the pressure regulation chamber;
a pressure regulating spring that biases the piston toward the output side,
The valve seat is characterized in that an annular groove is formed on the inner peripheral surface or the outer peripheral surface.

According to the above invention, since the pressing force is absorbed by the annular groove formed in the valve seat, deformation of the seat surface in contact with the valve body does not occur. It becomes possible to prevent the deformation of the valve seat without needing it.

Further, an inlet cover having a fluid inlet and a cylindrical fitting projection protruding on the opposite side of the inlet is attached so as to communicate the inlet with the input side of the passage. and the annular groove is formed on the outer peripheral surface of the valve seat,
The valve seat holding portion is
the fitting protrusion;
a fitting recess that is formed on the input side of the passage, has an inner diameter that substantially matches the outer diameter of the valve seat, and has an annular holding piece that protrudes inward from an open end in the output side direction; consists of
The length of the fitting projection is longer than the length obtained by subtracting the thickness of the valve seat from the length of the fitting recess,
When the valve seat is fitted between the fitting concave portion and the fitting convex portion and held while being pressed, it is particularly desirable because the valve seat can be reliably held with a relatively simple structure.

Furthermore, when the depth of the annular groove is equal to or greater than the projecting width of the annular holding piece, the pressing force can be more reliably absorbed by the annular groove, and deformation of the seat surface in contact with the valve body occurs. There is no

In addition, the piston in the present invention is
the valve body that contacts or separates from the valve seat;
an inlet-side piston section that divides the interior of the passage into the decompression chamber and the atmospheric pressure chamber;
an outlet-side piston section that divides the interior of the passage into the atmospheric pressure chamber and the pressure regulating chamber;
It is desirable that the pressure reducing chamber and the pressure regulating chamber are communicated with each other through a fluid passage.

Further, an inlet cover having a fluid inlet is attached so as to communicate the inlet with the input side of the passage, and the annular groove is formed on the inner peripheral surface of the valve seat,
The valve seat holding portion is
a valve seat holding hole having an inner diameter substantially matching the outer diameter of the valve seat;
a threaded hole formed continuously and coaxially with the valve seat holding hole;
a fixing screw having a head portion larger in diameter than the diameter of the center hole of the valve seat and screwed into the screw hole;
a disc-shaped valve seat holding member mounted between the inlet cover and the body, comprising a through hole formed around the valve seat holding hole and through which a fluid passes,
When the valve seat is fitted into the valve seat retaining hole and held while being pressed by the fixing screw, it is particularly desirable because the valve seat can be reliably held with a relatively simple structure.

Furthermore, when the depth of the annular groove is equal to or greater than the projection width of the head portion of the fixing screw, the pressing force can be more reliably absorbed by the annular groove, and deformation of the seat surface in contact with the valve body can be prevented. never occur.

In addition, the piston in the present invention is
a valve body that contacts or separates from the valve seat and divides the interior of the passage into the decompression chamber and the atmospheric pressure chamber;
It is desirable that the passage comprises a piston portion that divides the passage into the atmospheric pressure chamber and the pressure regulation chamber, and a fluid passage penetrating the valve body and communicating the decompression chamber and the pressure regulation chamber.

Further, when the annular groove is formed in parallel with the seat surface in contact with the valve body, it is desirable because it is easy to mold, and it is easily crushed appropriately and easily absorbs the pressing force.

According to the present invention, since the pressing force is absorbed by the annular groove formed in the valve seat, deformation of the seat surface in contact with the valve body does not occur. It becomes possible to prevent the deformation of the valve seat without needing it.

BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing which shows preferable embodiment in this invention. FIG. 2 is an enlarged partial cross-sectional view showing an assembly process in the embodiment shown in FIG. 1; FIG. 2(a) is a perspective view and (b) is a partially cutaway perspective view showing the valve seat in the embodiment shown in FIG. 1; FIG. 2 is an enlarged partial cross-sectional view showing the deformation process of the valve seat in the embodiment shown in FIG. 1; FIG. 2 is a cross-sectional view using a different piston in the embodiment shown in FIG. 1; Sectional drawing which shows another embodiment of this invention. FIG. 7 is an exploded sectional view showing a valve seat and a valve seat holding member in the embodiment shown in FIG. 6; FIG. 7 is an explanatory view showing the deformation process of the valve seat in the embodiment shown in FIG. 6; Sectional drawing which shows an example of the conventional piston-type regulator. FIG. 10 is an enlarged partial sectional view showing an assembly process in the conventional example shown in FIG. 9; FIG. 10 is an enlarged partial cross-sectional view showing a deformed state of the valve seat in the conventional example shown in FIG. 9; Sectional drawing which shows a different example of the conventional piston type regulator. FIG. 13 is an exploded sectional view showing the valve seat and the valve seat holding member in the conventional example shown in FIG. 12; FIG. 13 is an enlarged partial cross-sectional view showing a deformed state of the valve seat in the conventional example shown in FIG. 12;

EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated, referring drawings.

1 to 4 are diagrams showing preferred embodiments of the present invention. The same components as those of the conventional example shown in FIGS. 9 to 11 are denoted by the same reference numerals.

The regulator 1 has a cylindrical passage 20 penetrating through a body 10A made of metal or hard synthetic resin. The input side 21 and the output side 22 are provided with an inlet cover 30 having an inlet 31 for airtightly introducing the fluid and an outlet cover 40 having an outlet 41 for airtightly taking out the fluid. They are secured by fasteners 32, 42 such as setscrews.

The passage 20 is divided into a decompression chamber 23, an atmospheric pressure chamber 24 and a pressure regulating chamber 25 in order from the input side 21 to the output side 22. , the pressure is regulated to a predetermined pressure in the pressure regulating chamber 25 and discharged from the outlet 41 . Reference numeral 11 denotes a communication hole for communicating the atmospheric pressure chamber 24 and the external space of the body 10A to make the pressure in the atmospheric pressure chamber 24 equal to the atmospheric pressure.

The input side 21 of the passage 2 is formed with a fitting recess 26 having an annular holding piece 27 projecting inwardly at the open end in the direction of the output side 22 .

A cylindrical fitting convex portion 33 is formed so as to protrude from the side of the entrance cover 30 opposite to the introduction port 31 .

The fitting concave portion 26 and the fitting convex portion 33 constitute a valve seat holding portion, and the space between the fitting concave portion 26 and the fitting convex portion 33 is formed of an elastic material such as resin or rubber. An annular valve seat 100 having an outer diameter substantially matching the inner diameter of the fitting recess 26 and capable of being inserted into the fitting recess 26 is fitted and held.

The valve seat 100 has an annular shape with a center hole 101 formed therein, and has a seat surface 102 in contact with the valve body 51 of the piston 50 and a back surface 103 on the opposite side. 102 is an R-chamfered shape (see FIG. 3).

The outer diameter of the fitting projection 33 is substantially the same as the inner diameter of the fitting recess 26 and is formed to have a diameter that allows insertion into the fitting recess 26. The length L1 of the fitting projection 33 is It is formed longer than the length L3 obtained by subtracting the thickness T1 of the valve seat 100 from the length L2 of the fitting recess 26 .

In this way, in order to prevent the valve seat 100 from floating or shifting and fluid leakage due to manufacturing tolerances, the length L1 of the fitting convex portion 33 is longer than the length L3. By being formed, the valve seat 100 is held in a state where a constant pressure is applied by being pushed by the fitting convex portion 33 .

On the output side 22 of the passage 2, a piston 50 is arranged so as to be slidable in the passage 20 in the axial direction and partitions the decompression chamber 23, the atmospheric pressure chamber 24 and the pressure regulating chamber 25; A pressure adjusting spring 60 is provided to urge the piston 50 toward the output 22 side.

The piston 50 includes a valve body 51 that contacts or separates from the valve seat 100, an inlet-side piston portion 52 that divides the interior of the passage 20 into the decompression chamber 23 and the atmospheric pressure chamber 24, and the interior of the passage 20 as described above. It comprises an outlet-side piston portion 53 that partitions the atmospheric pressure chamber 24 and the pressure regulation chamber 25 , and a fluid passage 54 that communicates the decompression chamber 23 and the pressure regulation chamber 25 . A seal member 55 is fitted on the inlet side piston portion 52 and a seal member 56 is fitted on the outlet side piston portion 53 .

The pressure regulating spring 60 has a strength set to balance the pressure load received by the piston 50, and is mounted in the atmospheric pressure chamber 24 to contact the outlet side piston portion 53 of the piston 50. The body 10A and the piston 50 are biased in a direction to separate them from each other.

The operation of the regulator having the above configuration will be described below.
First, when a high-pressure fluid is introduced from the introduction port 31 , the fluid passes through the central hole 101 formed in the valve seat 100 and flows into the decompression chamber 23 .

At this time, as an initial stage, the piston 50 is pushed by the pressure regulating spring 60, the valve seat 100 and the valve body 51 are separated from each other, and the valve is in an open state. It flows into the pressure regulating chamber 25 .

Thereafter, as the pressure in the pressure regulating chamber 25 increases due to the fluid flowing into the pressure regulating chamber 25, the piston 50 is pushed toward the inlet side 21, and the pressure in the pressure regulating chamber 25 increases. reaches a predetermined pressure, the valve seat 100 and the valve body 51 come into contact with each other to close the valve, thereby blocking the inflow of the fluid.

When the fluid in the pressure regulating chamber 25 is discharged from the outlet 41 and the pressure in the pressure regulating chamber 25 is reduced, the piston 50 is pushed by the pressure regulating spring 60, and the valve seat 100 and the valve seat 100 are closed. The valve body 51 is returned to the opened state in which it is separated.

By repeating the above operation and changing the clearance area between the valve seat 100 and the valve body 51, the pressure of the discharged fluid is kept constant.

Here, the difference from the regulator 3 shown in FIGS. 9 to 11 is that the outer peripheral surface 106 of the valve seat 100 made of an elastic material such as resin or rubber has a predetermined depth and width toward the center. The point is that an annular groove 107 is formed.

Since the annular groove 107 is formed, when the valve seat 100 is pressed in the axial direction by the fitting convex portion 33, the annular groove 107 absorbs the pressing force and deforms, thereby causing the valve seat 100 to deform. Deformation of the seat surface 102 can be suppressed.

At this time, since the depth D1 of the annular groove 107 is equal to or greater than the projecting width W1 of the annular holding piece 27, the pressing force can be more reliably absorbed by the annular groove 107, and the valve body 51 and There is no deformation of the contacting seat surface 102 .

The deformation process of the valve seat will be described below with reference to FIG.
First, FIG. 4(a) is a view showing a state in which the inlet cover 30 is attached to the body 10A and pushed in until the fitting convex portion 33 contacts the back surface 103 of the valve seat 100. By tightening the fixture 32 , the entire inlet cover 30 moves toward the body 10</b>A, and the fitting projection 33 applies pressure to the valve seat 100 .

FIG. 4(b) is a diagram showing a state in which the attachment of the entrance cover 30 is completed by tightening the fastener 32. As shown in this diagram, the wall surface of the annular groove 107 on the side of the seat surface 102 is curved. The pressing force of the fitting convex portion 33 can be absorbed by deforming so as to approach the back surface 103 side.

FIG. 4(c) is a diagram showing a state in which the fixing member 32 is tightened and the entrance cover 30 is completely attached when the length of the fitting convex portion 33 is longer than that in FIG. 4(b). As shown in this figure, the wall surface of the annular groove 107 on the side of the seat surface 102 bends and deforms so as to come closer to the back surface 103 side, thereby absorbing the pressing force of the fitting protrusion 33 . can do.

Further, FIG. 5 shows an embodiment using a different piston based on the embodiment shown in FIGS. , but differ in the construction of the piston and outlet cover.

In this embodiment, a communicating hole 57 having the same inner diameter as the seat diameter is provided in the central axis of the valve body 51, and a rod 43 protruding from the outlet cover 40 is inserted airtightly into the communicating hole 57, whereby the piston is It has a structure in which the load due to the fuel inlet pressure applied to 50 can be offset, and the pressure at the fuel outlet is stabilized by the fuel inlet pressure.

6 and 8 are cross-sectional views showing different embodiments of the present invention, and the same components as those of the conventional example shown in FIGS. 12 to 14 are denoted by the same reference numerals.

The regulator 2 has a tubular passage 20 penetrating through a body 10B made of metal or hard synthetic resin. The input side 21 and the output side 22 are provided with an inlet cover 30 having an inlet 31 for airtightly introducing the fluid and an outlet cover 40 having an outlet 41 for airtightly taking out the fluid. They are secured by fasteners 32, 42 such as setscrews.

The passage 20 is divided into a decompression chamber 23, an atmospheric pressure chamber 24, and a pressure regulating chamber 25. A high-pressure fluid introduced from the introduction port 31 is decompressed in the decompression chamber 23 and then in the pressure regulating chamber 24. It is discharged from the outlet 41 after being adjusted to a predetermined pressure. Reference numeral 11 denotes a communication hole for communicating the atmospheric pressure chamber 24 and the external space of the body 10B to make the pressure in the atmospheric pressure chamber 24 equal to the atmospheric pressure.

A disk-shaped valve seat holding member 70 is mounted between the inlet cover 30 and the body 10B on the input side 21 of the passage 2, and the valve seat 110 is a valve seat holding portion. It is held by member 70 .

The valve seat holding portion 70 includes a valve seat holding hole 71 having an inner diameter substantially matching the outer diameter of the valve seat 110, a threaded hole 72 formed continuously with the valve seat holding hole 71, and the valve seat. A head 74 having a diameter larger than the diameter of the central hole 111 of 110 is formed, and is provided with a fixing screw 73 screwed into the screw hole 72 and a through hole 75 through which fluid passes.

For attaching the valve seat 110 to the valve seat holding member 70, the valve seat 110 is inserted into the valve seat holding hole 71, and the head portion 74 having a larger diameter than the central hole 111 of the valve seat 110 is inserted. By screwing the fixing screw 73 into the screw hole 72 , the valve seat 110 is held under a constant pressure by being pushed by the head 74 .

The valve seat 110 has an annular shape with a central hole 111 and has a seat surface 112 in contact with the valve body 81 and a back surface 113 on the opposite side.

On the output side 22 of the passage 2, a piston 80 is arranged so as to be slidable in the passage 20 in the axial direction and partitions the decompression chamber 23, the atmospheric pressure chamber 24 and the pressure regulating chamber 25; A pressure adjusting spring 60 is provided to urge the piston 80 toward the output side.

The piston 80 includes a valve body 81 that contacts or separates from the valve seat 110 and partitions the interior of the passage 20 into the decompression chamber 23 and the atmospheric pressure chamber 24 , A piston portion 82 that partitions the pressure regulating chamber 25 , and a fluid passage 83 that penetrates the valve body 81 and communicates the decompression chamber 23 and the pressure regulating chamber 25 . Reference numeral 84 denotes a sealing member fitted on the valve body 81, and reference numeral 85 denotes a sealing member fitted on the piston portion 82. As shown in FIG.

The pressure regulating spring 60 has a strength set to balance the pressure load received by the piston 80, and is mounted in the atmospheric pressure chamber 24 to contact the piston portion 82 of the piston 80, thereby increasing the pressure of the body 10B. and urge the pistons 80 in a direction to separate them from each other.

Here, the difference from the regulator 4 shown in FIGS. 12 to 14 is that the inner peripheral surface 116 of the valve seat 110 made of an elastic material such as resin or rubber has a predetermined depth and width toward the center. The difference is that an annular groove 117 is formed.

Since the annular groove 117 is formed, when the valve seat 110 is pressed in the axial direction by the head portion 74 of the fixing screw 73, the annular groove 117 absorbs the pressing force and deforms. Accordingly, deformation of the seat surface 112 can be suppressed.

At this time, since the depth D2 of the annular groove 117 is equal to or greater than the protrusion width W2 of the head portion 74, the pressing force can be more reliably absorbed by the annular groove 117, and the contact with the valve body 81 is ensured. There is no deformation of the seat surface 112 to be done.

The deformation process of the valve seat 110 will be described below with reference to FIG.
First, FIG. 8(a) is a diagram showing a state in which the head 74 of the fixing screw 73 is screwed until it contacts the seat surface 112 of the valve seat 110. From this point, the fixing screw 73 is tightened to The fixing screw 73 moves inward, and the head 74 applies a pressing force to the valve seat 110 .

FIG. 8(b) is a diagram showing a state in which the fixing screw 73 is tightened to complete the fixing of the valve seat 110. As shown in this drawing, the wall surface of the annular groove 117 on the side of the seat surface 112 is curved. Then, the pressing force of the head portion 74 can be absorbed by deforming so as to approach the back surface 113 side.

In each embodiment of the present invention, when the annular groove formed in the valve seat is formed parallel to the seat surface in contact with the valve body, it is easy to mold and moderately crushable and absorbs the pressing force. It is desirable because it is easy to

As described above, according to the present invention, since the pressing force is absorbed by the annular groove formed in the valve seat, deformation of the seat surface in contact with the valve body does not occur. It becomes possible to prevent deformation of the valve seat without requiring nervous assembly.

1, 2, 3, 4 regulator, 10A, 10B body, 11 communication hole, 20 passage, 21 input side, 22 output side, 23 decompression chamber, 24 atmospheric pressure chamber, 25 pressure regulation chamber, 26 fitting recess, 27 annular Holding piece 30 Inlet cover 31 Inlet 32 Fastener 33 Fitting protrusion 40 Outlet cover 41 Outlet 42 Fastener 43 Rod 50 Piston 51 Valve body 52 Inlet side piston 53 Outlet side piston portion 54 Fluid passage 55 Sealing member 56 Sealing member 57 Conducting hole 60 Pressure regulating spring 70 Valve seat holding member 71 Valve seat holding hole 72 Screw hole 73 Fixing screw 74 Head 75 through hole, 80 piston, 81 valve body, 82 piston portion, 83 fluid passage, 84 sealing member, 85 sealing member, 100 valve seat, 101 center hole, 102 seat surface, 103 back surface, 104 outer portion, 105 inner portion, 106 outer peripheral surface 107 annular groove 110 valve seat 111 central hole 112 seat surface 113 back surface 114 outer portion 115 inner portion 116 inner peripheral surface 117 annular groove D1 depth of annular groove D2 annular groove L1 length of fitting projection L2 length of fitting recess L3 length obtained by subtracting thickness of valve seat from length of fitting recess T1 thickness of valve seat W1 annular holding piece Projection width, W2 Head projection width

Claims (8)

A regulator for obtaining a fluid adjusted to a desired pressure by decompressing a high-pressure fluid,
body and
a passage formed through the body and having one end on a fluid input side and the other end on a fluid output side;
a decompression chamber, an atmospheric pressure chamber, and a pressure regulation chamber formed by dividing the passage in order from the input side to the output side;
an annular valve seat provided at a position closer to the input side than the decompression chamber in the passage and having a center hole formed in the center thereof;
a valve seat holder that holds the valve seat while pressing it in the axial direction;
a piston that includes a valve body that contacts or separates from the valve seat, is disposed slidably in the passage in the axial direction, and partitions the decompression chamber, the atmospheric pressure chamber, and the pressure regulation chamber;
a pressure regulating spring that biases the piston toward the output side;
A regulator, wherein the valve seat has an annular groove formed on an inner peripheral surface or an outer peripheral surface thereof. An inlet cover having a fluid introduction port and a cylindrical fitting projection protruding on the opposite side of the introduction port is mounted so as to communicate the introduction port with the input side of the passage. , the annular groove is formed on the outer peripheral surface of the valve seat,
The valve seat holding portion is
the fitting protrusion;
a fitting recess that is formed on the input side of the passage, has an inner diameter that substantially matches the outer diameter of the valve seat, and has an annular holding piece that protrudes inward from an open end in the output side direction; consists of
The length of the fitting projection is longer than the length obtained by subtracting the thickness of the valve seat from the length of the fitting recess,
2. The regulator according to claim 1, wherein said valve seat is fitted between said fitting concave portion and said fitting convex portion and held while being pressed. 3. A regulator according to claim 2, wherein the depth of said annular groove is equal to or greater than the projecting width of said annular holding piece. The piston is
the valve body that contacts or separates from the valve seat;
an inlet-side piston section that divides the interior of the passage into the decompression chamber and the atmospheric pressure chamber;
an outlet-side piston section that divides the interior of the passage into the atmospheric pressure chamber and the pressure regulating chamber;
4. A regulator according to claim 2 or 3, further comprising a fluid passage communicating said decompression chamber and said pressure regulation chamber. an inlet cover having a fluid inlet is attached so as to communicate the inlet with the input side of the passage, and the annular groove is formed in the inner peripheral surface of the valve seat,
The valve seat holding portion is
a valve seat holding hole having an inner diameter substantially matching the outer diameter of the valve seat;
a threaded hole formed continuously and coaxially with the valve seat holding hole;
a fixing screw having a head portion larger in diameter than the diameter of the center hole of the valve seat and screwed into the screw hole;
a disc-shaped valve seat holding member mounted between the inlet cover and the body, comprising a through hole formed around the valve seat holding hole and through which a fluid passes,
2. The regulator according to claim 1, wherein said valve seat is fitted in said valve seat holding hole and held while being pressed by said fixing screw. 6. The regulator according to claim 5, wherein the depth of said annular groove is equal to or greater than the projection width of the head of said fixing screw. The piston is
a valve body that contacts or separates from the valve seat and divides the interior of the passage into the decompression chamber and the atmospheric pressure chamber;
and a fluid passage penetrating through the valve body and communicating between the pressure reducing chamber and the pressure regulating chamber. A regulator according to claim 5 or 6. 8. A regulator according to claim 1, 2, 3, 4, 5, 6 or 7, wherein said annular groove is formed parallel to a seat surface in contact with said valve body.

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