JP2016051483A - Super high pressure reduction valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce noise generated when fluid having super high pressure is reduced in pressure.SOLUTION: A reduction valve 1 for adjusting pressure of fluid entering a primary side chanel 27 and then discharging it to a secondary side channel 28, comprises: a valve seat 15 disposed between the primary side channel 27 and the secondary side channel 28; a valve body 14 which is disposed so as to displace freely with respect to the valve seat 15; a spring 21 for acting thrust in an open direction to the valve body 14 according to a displacement amount of the valve body 14; and a diaphragm 19 for acting thrust in a close direction to the valve body 14 by receiving pressure of the fluid in the secondary side channel 28. The valve body 14 and the valve seat 15 stand face to face each other by surfaces, the facing surfaces have concentric circular irregularity parts respectively. A salient part on one surface is arranged in a recess part on the other surface with a predetermined gap therebetween, and a cross section is a sawtooth shape. By adjusting the gap between the valve body 14 and valve seat 15, the fluid in the secondary side channel 28 is adjusted in pressure, so that the fluid entering the primary side channel 27 radially flows outward of the gap between the valve seat 15 and the valve body 14 from a central part of the facing surface of the valve seat 15.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an ultra-high pressure fluid pressure reducing valve.

  In recent years, practical fuel cells have been developed as energy sources for vehicle power. This fuel cell is a system that generates electric power by utilizing an electrochemical reaction between hydrogen and oxygen. An example thereof is a polymer electrolyte fuel cell. This polymer electrolyte fuel cell includes a stack constituted by stacking a plurality of cells. The cell constituting the stack includes an anode (fuel electrode) and a cathode (air electrode), and a solid polymer electrolyte having a sulfonic acid group as an ion exchange group is interposed between the anode and the cathode. doing.

  A fuel gas containing hydrogen is supplied to the anode, and a gas containing oxygen as an oxidant, for example, air, is supplied to the cathode. By supplying the fuel gas to the anode, hydrogen contained in the fuel gas reacts with the catalyst of the catalyst layer constituting the anode, thereby generating hydrogen ions. The generated hydrogen ions pass through the solid polymer electrolyte membrane and cause an electrochemical reaction with oxygen at the cathode. It is a mechanism to generate electricity by this electrochemical reaction.

  By the way, although the fuel gas containing hydrogen is used for the fuel cell as described above, there are various forms of fuel for mounting such a fuel such as liquid, solid, and gas. Among these forms, the simplest method includes a method of storing hydrogen gas at a high pressure, a method of storing compressed natural gas (CNG) at a high pressure, and supplying it to a fuel cell as a mixed gas with carbon dioxide. is there.

  The above hydrogen gas and compressed natural gas have a large volume at low pressure. For this reason, when mounted in a limited vehicle space, it is stored in a tank made of a carbon fiber composite material or the like in an ultrahigh pressure state of 35 MPa or 70 MPa.

  On the other hand, in a fuel cell system using high-pressure hydrogen as a fuel, hydrogen and air are supplied across an electrolyte membrane of several tens of microns. For this reason, it is required to reduce the pressure difference between hydrogen and air. Accordingly, if the air pressure is increased, the compression power is added and the overall efficiency is lowered. For this reason, in a polymer electrolyte fuel cell, it is common to operate by reducing the hydrogen pressure to several MPa.

  Therefore, as described above, hydrogen stored in the tank in an ultrahigh pressure state of 35 MPa or 70 MPa is supplied to the fuel cell by a pressure reducing valve as disclosed in Patent Document 1 below, for example.

  Patent Document 1 discloses a control valve that reduces noise. A fluid control unit that rectifies the fluid whose pressure is adjusted by the poppet valve is provided. Thereby, the vortex generated in the fluid passing through the poppet valve is rectified by passing through the fluid control unit, and the control valve noise caused by the vortex of the fluid can be reduced.

  However, in the structure of the control valve of Patent Document 1, when the fluid from the primary side passes through the poppet valve, the flow of the fluid is inward, that is, the flow is such that the fluid flow gathers at the center of the valve body. . In this configuration, eddy currents cannot be prevented even if the pressure is adjusted in an ultra-high pressure fluid. Therefore, a sufficient effect cannot be expected for reducing noise, and the problem of reducing noise cannot be solved. .

  Patent Document 2 discloses an invention of a gas discharge prevention pressure regulator, and describes a lever-type pressure regulator. The valve body of this pressure regulator is made of rubber, and the pressure of fluid normally used is 0.4 to 1.2 MPa. In the pressure regulator described in Patent Document 2, since the valve body is made of rubber, it is difficult to apply this valve mechanism to an ultra-high pressure fluid.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to reduce noise generated when decompressing an ultra-high pressure fluid.

  The present invention relates to a pressure reducing valve that regulates the fluid flowing into the primary flow path and discharges it to the secondary flow path, and a valve seat provided between the primary flow path and the secondary flow path. , A valve body arranged to be displaceable with respect to the valve seat, a spring that applies a thrust in the opening direction to the valve body in accordance with a displacement amount of the valve body, and a fluid pressure in the secondary side flow path And a diaphragm that applies thrust in the closing direction to the valve body, the valve body and the valve seat face each other, and the face that faces the valve body and the valve seat has concentric unevenness. Fluid, wherein one convex portion is arranged with a predetermined gap in the other concave portion, and the fluid in the secondary side flow path is regulated by adjusting the gap and flows into the primary side flow path Flows radially from the central part of the valve seat on the surface facing the valve body toward the outside of the gap with the valve body A pressure reducing valve, characterized in that the.

  According to the present invention, the cross-section of the concavo-convex portion of the surface of the valve body and the valve seat facing each other has a sawtooth shape, and the sawtooth shape gradually increases toward the periphery of the valve body and the valve seat. This is a pressure reducing valve. The pressure reducing valve is characterized in that a gap between the opposing surfaces of the valve body and the valve seat is gradually widened toward the periphery of the valve body and the valve seat.

  ADVANTAGE OF THE INVENTION According to this invention, the noise which generate | occur | produces when decompressing an ultrahigh pressure fluid can be reduced.

It is sectional drawing which shows the structure of the pressure-reduction valve which concerns on the 1st Embodiment of this invention. It is a perspective view which shows the structure of the pressure-reduction valve which concerns on 1st Embodiment. It is the schematic of the cross section of the other shape (rectangular tooth) of a slit pressure reduction mechanism part. It is the schematic of the cross section of the other shape (trapezoid tooth) of a slit pressure reduction mechanism part. It is the schematic of the cross section of the other shape (sine wave or circular arc) of a slit pressure reduction mechanism part. It is the figure which compared the noise reduction effect of a slit pressure-reduction mechanism part with the conventional needle valve. It is sectional drawing which shows the structure of the pressure-reduction valve which concerns on 2nd Embodiment. It is a left sectional view of a pressure-reduction valve concerning a 2nd embodiment. It is sectional drawing which shows the structure of the pressure-reduction valve which concerns on 3rd Embodiment. It is sectional drawing which shows the structure of the pressure-reduction valve which concerns on 4th Embodiment.

Embodiments according to the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing a configuration of a pressure reducing valve according to a first embodiment of the present invention. FIG. 2 is a perspective view showing the configuration of the pressure reducing valve.
The pressure reducing valve 1 shown in FIGS. 1 and 2 is used in a fuel cell system, and introduces, for example, a very high pressure 30 to 70 MPa fuel gas (hereinafter referred to as fluid) derived from a fuel tank (hereinafter referred to as fluid supply source). The pressure is reduced to a predetermined value of MPa and the fuel cell (hereinafter referred to as a fluid output destination) is supplied. The pressure reducing valve 1 is applied to hydrogen gas as a fuel gas. However, the pressure reducing valve 1 is not limited to this, and is provided in a circuit through which a high-pressure, large-flow fluid flows, such as a device or equipment that uses other gas or liquid. Also good.

  The pressure reducing valve 1 includes, as its casing, a first housing 10 having a cylindrical shape and a second housing 11 provided with a flange portion for connecting to the first housing 10 in a dish shape. A diaphragm slit connecting shaft 13, a slit movable part (valve element) 14, a slit fixing part (valve seat) 15, a diaphragm 19, an adjustment spring (spring) 21, an auxiliary spring 26 and the like are accommodated in the first and second housings. Is done.

The first housing 10 includes a supply port (primary-side flow path) 27 and an output port (secondary-side flow path) 28 that open to a cylindrical outer peripheral portion, and accommodates the slit movable portion 14, the slit fixing portion 15, and the like. A bottomed cylindrical decompression chamber 30 is formed, and a bottomed cylindrical guide hole smaller than the opening of the decompression chamber 30 that fixes one end of the auxiliary spring 26 is formed at the center of the bottom surface of the decompression chamber 30.
The supply port 27 that opens to the first housing 10 is a cylindrical opening, and a through-hole that penetrates from the bottom of the opening toward the center is formed.

  An auxiliary spring 26 is disposed in a guide hole provided in the bottom surface of the decompression chamber 30 of the first housing 10, and connects the first housing 10 and the slit movable part mounting plate 12. The auxiliary spring 26 is used to adjust the reference value of the fluid pressure regulation value, and biases the slit movable portion 14 in the closing direction.

The slit movable portion 14 is fixed to the disk-shaped slit movable portion mounting plate 12 connected to the auxiliary spring 26.
The slit movable part 14 and the slit fixing part 15 face each other, and open and close the valve by adjusting the gap. The confronting surfaces of the slit movable part 14 and the slit fixing part 15 are provided with concentric concavo-convex parts, one convex part is arranged with a predetermined gap in the other concave part, and the concavo-convex part is formed in a sawtooth shape in cross section. Has been. The fluid that flows into the primary channel flows radially from the center of the slit fixing portion 15 through the gap between the slits.

  Further, the facing surfaces of the slit movable portion 14 and the slit fixing portion 15 may have a ripple shape from the center of the facing surface toward the periphery, and the waveform may be formed in a sawtooth shape in cross section.

  The sawtooth shape of the facing surface is formed so as to gradually increase from the center of the slit fixing portion 15 toward the peripheral portion. Further, the gap between the slit movable portion 14 and the slit fixing portion 15 is formed so as to gradually increase from the center toward the peripheral portion.

An insertion hole is formed in the slit fixing portion 15 from the outer peripheral portion toward the center, and is communicated with the insertion hole toward the surface facing the slit movable portion 14 at a right angle from the center of the slit fixing portion 15 to the primary side. A flow passage is formed. The high-pressure introduction tube 24 is inserted into the insertion hole from the outer peripheral portion toward the center.
The high-pressure introduction pipe 24 is provided with an annular guide portion in an elongated cylindrical introduction pipe provided with a primary side flow passage of fluid inside. The annular guide portion is fitted into the supply port 27 of the first housing 10, and the elongated introduction tube is inserted into an insertion hole formed in the slit fixing portion 15 fixed to the opening of the decompression chamber 30 of the first housing 10. Inserted.

  After the slit fixing part 15 is fixed to the first housing 10, the high-pressure introduction pipe 24 is inserted into the insertion hole of the slit fixing part 15, and the high-pressure introduction pipe is inserted by the introduction pipe holder 25 provided with an annular male screw on the outer peripheral part. 24 is fixed to the opening of the supply port 27.

  A plurality of (four in this embodiment) cylindrical diaphragm slit coupling shafts 13 are attached to the slit movable part mounting plate 12. Diaphragm slit coupling shaft 13 is caulked to slit movable part mounting plate 12, or a male screw formed at a lower portion of diaphragm slit coupling shaft 13 is screwed into a tap hole formed in slit movable part mounting plate 12. Fixed by welding.

  The slit fixing part mounting plate (attaching part) 16 to which the slit fixing part 15 is fixed is provided with a through hole through which the diaphragm slit connecting shaft 13 can slide. The diaphragm slit connecting shaft 13 integrated with the slit movable portion 14 is connected to the diaphragm through this through hole, thereby realizing a pressure adjusting function.

  A space formed by the second housing 11 and the diaphragm 19 is a back pressure chamber 29 into which atmospheric pressure is introduced. An adjustment spring 21 is disposed in the back pressure chamber 29 and connects the adjustment screw 23 and the diaphragm 19. The adjusting screw 23 is used to set a reference value for the pressure regulation value of the fluid, and biases the diaphragm 19 to the side opposite to the back pressure chamber.

The male screw formed at the tip of the diaphragm slit coupling shaft 13 passes through the slit coupling shaft mounting plate 18 and is fixed to the slit coupling shaft mounting plate 18 with a nut.
A diaphragm connecting portion 31 having a disk shape and a male screw is attached to the slit connecting shaft mounting plate 18.

The male screw formed on the upper portion of the diaphragm connecting portion 31 passes through the diaphragm 19 and the adjustment spring holding portion 20, and is fixed with a nut from the upper side of the adjustment spring holding portion 20.
The diaphragm connecting portion 31 is fitted into the hole in the center portion of the slit connecting shaft mounting plate 18 and is urged and restrained by the adjustment spring 21 and the auxiliary spring 26 from above and below.

The diaphragm slit coupling shaft 13 and the slit coupling shaft mounting plate 18 are fixed by nuts, but the diaphragm slit coupling shaft 13 and the slit coupling shaft mounting plate 18 are integrated so that the diaphragm slit coupling shaft 13 is attached to the movable slit portion. The bottom surface of the plate 12 can be fixed with a nut.
In the present embodiment, the number of diaphragm slit coupling shafts 13 is four, but when the number is increased to six or eight, the diaphragm slit coupling shafts 13 may be fixed on the lower surface.

With the configuration described above, the slit movable portion 14 has an opening direction thrust received from the adjustment spring 21, a closing direction thrust received from the fluid of the output port 28 via the diaphragm 19, and a closing direction thrust received from the auxiliary spring 26. Works.
Since the adjustment spring 21 and the auxiliary spring 26 have a larger spring force than the adjustment spring 21, the slit movable portion 14 has a difference in spring force between the two adjustment springs 21 and the auxiliary spring 26 and the displacement of the slit movable portion 14. A thrust of a magnitude corresponding to the amount acts in the opening direction. The pressure reducing valve 1 is provided with an automatic pressure regulating function that maintains the fluid pressure of the output port 28 at a substantially constant pressure by balancing these thrusts acting on the slit movable portion 14.

  For example, when the pressure of the fluid in the output port 28 decreases and the pressure in the decompression chamber 30 decreases accordingly, the force that the diaphragm 19 receives from the fluid in the decompression chamber 30 decreases. The thrust is lowered and the slit movable part 14 is driven in the opening direction. As a result, the pressure of the fluid in the decompression chamber 30 increases as the opening of the slit movable unit 14 increases, and is maintained at a constant pressure again.

  Conversely, when the pressure of the fluid at the output port 28 rises, the slit movable part 14 is driven in the closing direction as the force that the diaphragm 19 receives from the fluid in the decompression chamber 30 increases, and the fluid at the output port 28 This pressure is again maintained at a constant pressure as the opening of the slit movable portion 14 decreases.

  In this way, the ultrahigh pressure fluid supplied from the supply port 27 shown in FIG. 1 is guided to the center of the slit fixing portion 15 via the high pressure introduction pipe 24. Furthermore, the gap between the slit fixing part 15 and the slit movable part 14 flows radially outward and is decompressed, and is output from the decompression chamber 30 via the output port 28.

In the pressure reducing valve 1 configured as described above, in addition to the automatic pressure adjusting function, an ultra-high pressure fluid flows radially from the center of the slit fixing portion 15 to the outer peripheral portion through the gap with the slit movable portion 14, When passing through a sawtooth-shaped gap, the pressure is reduced while repeating expansion and contraction.
With such a structure, the noise of the ultrahigh pressure reducing valve can be reduced.

The opposed surfaces of the slit movable part 14 and the slit fixing part 15 are provided with concentric uneven parts, and one convex part is arranged with a predetermined gap in the other concave part, and the uneven part has a sawtooth shape in cross section. However, it is not limited to this shape.
FIGS. 3 to 5 are schematic views of cross-sections of other shapes of a decompression mechanism (hereinafter referred to as a slit decompression mechanism section) configured by the slit movable section 14 and the slit fixing section 15. The shape in FIG. 3 is a rectangular tooth shape, the shape in FIG. 4 is a trapezoidal tooth shape, and the shape in FIG. 5 is a sine wave or arc shape.

FIG. 6 is a diagram comparing the noise reduction effect of the saw-tooth shaped slit pressure reducing mechanism portion and the trapezoidal tooth-shaped slit pressure reducing mechanism portion according to this embodiment with a conventional needle valve. The horizontal axis shown in FIG. 6 is the flow rate per unit time, and the vertical axis is the measured noise level, expressed in decibels (dB).
High-pressure air (3 MPa in this case) is supplied from the center port of the slit fixing part 15, the flow rate is adjusted, and noise is measured at a position 0.5 m above the slit movable part 14.

  At a flow rate of 150 l / min (ANR), there is a difference of 22 dB compared to the saw-tooth shaped slit pressure reducing mechanism and the needle valve, and there is an effect of noise reduction. Further, there is a difference of 3 dB between the sawtooth shape and the trapezoidal tooth shape of the slit decompression mechanism portion, and the sawtooth shape is more effective in reducing noise than the trapezoidal tooth shape at a flow rate of 150 l / min (ANR).

  As a use of the pressure reducing valve 1 according to the present invention, it is preferable to use as a fuel gas pressure control means supplied to the anode of the fuel cell in the fuel cell system.

FIG. 7 is a cross-sectional view showing the configuration of the pressure reducing valve according to the second embodiment of the present invention. FIG. 8 is a left sectional view of the pressure reducing valve.
The pressure reducing valve 100 shown in FIGS. 7 and 8 includes a first housing 110, a second housing 111, and a third housing 153, and each housing is fixed with a bolt.
In the first housing 110, an adjustment rod 141, a swing lever (insulator) 142, a connecting pin 143, a fulcrum shaft 144 of the swing lever 142, and a rod 145 are housed. These constitute the link mechanism section of the second embodiment. The first housing 110 has an output port (secondary channel) 128 opened therein, and a decompression chamber 130, an insertion hole for the rod 145, and a communication path 146 are formed.

  The second housing 111 includes an adjustment spring (spring) 121, an adjustment spring holding plate 120, a diaphragm 119, and an insertion hole into which the adjustment screw 123 is inserted.

The third housing 153 accommodates a slit movable part (valve element) 114, a slit fixing part (valve seat) 115, and a plug 152.
The third housing 153 has a bottomed cylindrical shape, and a through hole of the rod 145 and a communication path 146 are formed on the bottom surface thereof. A passage hole 148, a guide hole 149, and a screw hole 150 are formed in the cylindrical opening, and the diameter of the opening increases in the order of the passage hole 148, the guide hole 149, and the screw hole 150.

That is, after the rod 145 connected to the slit movable portion 114 is inserted into the through hole of the rod 145 on the bottom surface, the flange portion of the slit fixing portion 115 is inserted to the boundary between the passage hole 148 and the guide hole 149, and the flange portion Is fitted into the guide hole 149. The plug 152 is fitted into the guide hole 149 and is screwed into the screw hole 150 with an outer peripheral screw having a larger radius than the guide hole 149. A supply port 127 (primary side flow path) is opened in the plug 152.
In this way, the slit fixing portion 115 is fixed to the third housing 153.

The pressure reducing valve 100 according to the present embodiment has a lever-type link mechanism that works in conjunction with the diaphragm 119.
This link mechanism portion is a substantially inverted L-shaped insulator, with the end of the short side of the L-shape serving as a fulcrum, and the end of the long side of the L-shape serving as a power point, and a thrust in the opening direction or the closing direction at the force point. And an action point is provided on the short side of the L-shaped bent portion, and the change of the power point is converted into a substantially right angle direction to connect the action point and the valve body.

  When the fluid in the output port 128 is consumed and the pressure in the decompression chamber 130 decreases, the diaphragm 119 bends downward in FIG. The diaphragm 119 is pushed by the adjustment spring 121 and the adjustment rod 141 operates the swing lever 142 to rotate the swing lever 142 counterclockwise with the fulcrum shaft 144 of the swing lever 142 as a fulcrum. The swing lever 142 and the rod 145 are engaged with each other by a connecting pin 143. Since the connecting pin 143 of the swing lever 142 pulls the rod 145 to the left, the slit movable portion 114 fixed to the tip of the rod 145 moves away from the facing surface.

The slit movable part 114 and the slit fixing part 115 face each other and adjust the gap to open and close the valve. The facing surfaces of the slit movable part 114 and the slit fixing part 115 are:
Concentric concavo-convex portions are provided, one convex portion is disposed with a predetermined gap in the other concave portion, and the cross section is formed in a sawtooth shape. The fluid flowing into the primary side flow path radially flows from the center of the slit fixing portion 115 through the gap between the slits toward the outside.

  Further, the facing surfaces of the slit movable portion 114 and the slit fixing portion 115 may be rippled from the center of the facing surface toward the periphery, and the waveform may be formed in a sawtooth shape in cross section.

  The sawtooth shape of the facing surface is formed so as to gradually increase from the center of the slit fixing portion 115 toward the peripheral portion. Further, the gap between the slit movable part 114 and the slit fixing part 115 is formed so as to gradually increase from the center toward the peripheral part.

The ultra-high pressure fluid flowing from the supply port 127 flows radially outward through the gap between the slit fixing part 115 and the slit movable part 114, passes through the control chamber 151 formed around the slit movable part 114, and communicates with the communication path 146. Through the decompression chamber 130 and out of the output port 128.
With this configuration, it is possible to reduce noise generated when the ultrahigh pressure fluid is decompressed.

FIG. 9 is a cross-sectional view illustrating a configuration of a pressure reducing valve according to the third embodiment.
The pressure reducing valve 200 of the third embodiment is different from the second embodiment in the shape of the facing surfaces of the slit movable part 214 and the slit fixing part 215. The opposing surfaces of the slit movable part 214 and the slit fixing part 215 of the third embodiment are formed in a tapered shape.
The third embodiment is the same as the second embodiment except for the Taber shape. Therefore, detailed description is omitted.
With this configuration, it is possible to reduce noise generated when the ultrahigh pressure fluid is decompressed.

FIG. 10 is a cross-sectional view showing a configuration of a pressure reducing valve according to the fourth embodiment.
The pressure reducing valve 300 of the fourth embodiment is different from the second embodiment in the shape of the facing surfaces of the slit movable part 314 and the slit fixing part 315. The opposing surfaces of the slit movable part 314 and the slit fixing part 315 of the fourth embodiment are formed as flat surfaces.
The fourth embodiment is the same as the second embodiment except for the plane. Therefore, detailed description is omitted.
With this configuration, it is possible to reduce noise generated when the ultrahigh pressure fluid is decompressed.

  DESCRIPTION OF SYMBOLS 1 ... Pressure reducing valve, 10 ... 1st housing, 11 ... 2nd housing, 12 ... Slit movable part mounting plate, 13 ... Diaphragm slit connection shaft, 14 ... Slit movable part, DESCRIPTION OF SYMBOLS 15 ... Slit fixing | fixed part, 16 ... Slit fixing | fixed part attaching plate, 17 ... Bolt, 18 ... Slit connecting shaft attaching plate, 19 ... Diaphragm, 20 ... Adjustment spring holding part, 21 ... Adjustment spring, 22 ... Bolt, 23 ... Adjustment screw, 24 ... High pressure introduction pipe, 25 ... Introduction pipe retainer, 26 ... Auxiliary spring, 27 ... Supply port, 28 ... Output port, 29 ... Back pressure chamber, 30 ... Decompression chamber, 31 ... Diaphragm connecting part, 100, 200, 300 ... Decompression valve, 110 ... First housing, 111 ..Second housing 114, 21 314: Slit movable part, 115, 215, 315 ... Slit fixing part, 119 ... Diaphragm, 120 ... Adjustment spring holding part, 121 ... Adjustment spring, 123 ... Adjustment screw, 127 ... Supply port, 128 ... Output port, 129 ... Back pressure chamber, 141 ... Adjustment rod, 142 ... Oscillating lever, 143 ... Connecting pin, 144 ... fulcrum shaft 145 ... Rod, 146 ... Communication passage, 148 ... Passage hole, 149 ... Guide hole, 150 ... Screw hole, 152 ... Plug, 153 ... Third housing.

JP 2013-196053 A Japanese Patent Laid-Open No. 10-124151

Claims (11)

In a pressure reducing valve that regulates the fluid flowing into the primary channel and discharges it to the secondary channel,
A valve seat provided between the primary channel and the secondary channel;
A valve body arranged to be displaceable with respect to the valve seat;
A spring that causes a thrust in the opening direction to act on the valve body according to the amount of displacement of the valve body;
A diaphragm that receives the pressure of the fluid in the secondary side flow path and causes a thrust in the closing direction to act on the valve body, and
The valve body and the valve seat face each other, and the face of the valve body and the valve seat face each other has a concentric concavo-convex portion, with one convex portion providing a predetermined gap in the other concave portion. The valve body is arranged and adjusts the fluid in the secondary flow path by adjusting the gap, and the fluid flowing into the primary flow path faces the valve body from the central portion of the valve seat. A pressure reducing valve characterized by flowing radially toward the outside of the gap. The pressure reducing valve according to claim 1,
The pressure reducing valve characterized in that the concentric uneven portion of the confronting surface of the valve body and the valve seat has a sawtooth cross section. In a pressure reducing valve that regulates the fluid flowing into the primary channel and discharges it to the secondary channel,
A valve seat provided between the primary channel and the secondary channel;
A valve body arranged to be displaceable with respect to the valve seat;
A spring that causes a thrust in the opening direction to act on the valve body according to the amount of displacement of the valve body;
A diaphragm that receives the pressure of the fluid in the secondary side flow path and causes a thrust in the closing direction to act on the valve body, and
The valve body and the valve seat face each other, adjust the gap between the valve body and the valve seat to regulate the fluid in the secondary side flow path, and the valve body and the valve seat face each other. The surface is rippled and the cross-section of the ripple is serrated, and the fluid flowing into the primary flow path is outside the gap between the valve body from the center of the valve seat on the surface facing the valve body. A pressure reducing valve characterized by flowing radially. The pressure reducing valve according to any one of claims 1 to 3,
The valve body and the diaphragm are connected by a plurality of connecting shafts, and a mounting portion to which the valve seat is attached is fixed between the valve body and the diaphragm, and the connecting shaft slides on the mounting portion. A pressure reducing valve provided with a through-hole capable of being provided. In a pressure reducing valve that regulates the fluid flowing into the primary channel and discharges it to the secondary channel,
A valve seat provided in the primary flow path;
A valve body arranged to be displaceable with respect to the valve seat;
A spring that causes a thrust in the opening direction to act on the valve body according to the amount of displacement of the valve body;
A diaphragm that receives the pressure of the fluid in the secondary side flow path and causes a thrust in the closing direction to act on the valve body;
A link mechanism portion that causes the valve element to act on the valve element in the opening direction or the closing direction by the spring and the diaphragm,
The valve body and the valve seat face each other, adjust the gap to regulate the fluid in the secondary side flow path, and the fluid flowing into the primary side flow path faces the valve seat A pressure reducing valve characterized in that it flows radially from the center of the valve seat toward the outside of the gap with the valve body. The pressure reducing valve according to claim 5,
The link mechanism portion is a substantially inverted L-shaped insulator having an end portion on the short side of the L-shape as a fulcrum and an end portion on the long side of the L-shape as a power point. A pressure reducing valve that applies a thrust in a direction, provides an action point on the short side of the L-shaped bent portion, converts the change of the force point into a substantially perpendicular direction, and connects the action point and the valve body . The pressure reducing valve according to claim 5 or 6,
The opposing surface of the valve body and the valve seat has concentric concave and convex portions, one convex portion is disposed with a predetermined gap in the other concave portion, and the cross section has a sawtooth shape. Pressure reducing valve. In the pressure reducing valve according to claim 5 or 6,
A pressure reducing valve in which a surface of the valve body and the valve seat facing each other has a tapered shape. In the pressure reducing valve according to claim 5 or 6,
A pressure reducing valve in which a surface of the valve body and the valve seat facing each other is a flat surface. The pressure reducing valve according to any one of claims 2 to 4 or 7,
The pressure reducing valve characterized in that the saw-tooth shape of the surface of the valve body and the valve seat facing each other gradually increases toward the periphery of the valve body and the valve seat. The pressure reducing valve according to any one of claims 1 to 10,
A pressure-reducing valve, wherein a gap between surfaces of the valve body and the valve seat is gradually widened toward a peripheral portion of the valve body and the valve seat.

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