JP2015218822A - Pressure reduction valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure reduction valve which can reduce the vibration of a poppet valve.SOLUTION: In a center portion of a partition wall 31 partitioning the inside of a center body, a through hole 32 having approximately circular cross section is formed. In the through hole 32, a poppet valve 13 is inserted and supported. In an end portion in an output chamber 7 side of the through hole 32, an O-ring reception 32b is formed. In the O-ring reception 32b, O-ring 14 into which a second valve body of the poppet valve 13 is inserted is provided.

Description

  The present invention relates to a pressure reducing valve.

  Conventionally, in a system called a process system such as a chemical plant or an electric power plant, control is performed using a control device that is driven and controlled by the pressure of a gas such as air instead of electricity for explosion prevention. Since the air supplied to the control device causes malfunction or failure if the pressure is too high, the pressure is reduced by a pressure reducing valve. One type of such a pressure reducing valve is a diaphragm type pressure reducing valve (see, for example, Patent Document 1).

The diaphragm type pressure reducing valve has a first opening / closing valve for communicating and blocking between the input chamber and the output chamber, and a second opening / closing for communicating and blocking between the output chamber and the exhaust chamber connected to the outside of the pressure reducing valve. The valve operates alternately in reverse.
Here, the first on-off valve has a valve hole formed in a partition wall separating the input chamber and the output chamber, and an umbrella-shaped first valve provided at one end of the stem inserted through the valve hole on the input chamber side. The valve body is urged toward the valve hole of the partition wall. In addition, the member provided with the rod-shaped stem and the 1st valve body formed in the end of this stem is called a poppet valve.
On the other hand, the second on-off valve has a valve hole formed in a valve plate coupled to a diaphragm separating the output chamber and the exhaust chamber, and the other end of the stem abutting on the valve hole (hereinafter referred to as “second valve”). The valve plate is urged toward the output chamber. The pressure of the pressurized air output from the output chamber (hereinafter referred to as “set pressure”) is set by adjusting the degree of urging to the valve plate as the generation force of the pressure adjusting spring.

  When the valve plate is biased toward the output chamber, the poppet valve stem is moved toward the input chamber by pressing the second valve body of the poppet valve into the valve hole of the valve plate, and the poppet valve The first valve body is separated from the valve hole formed in the partition wall separating the input chamber and the output chamber. In this state where the first on-off valve is opened and the second on-off valve is closed, when pressurized air is input to the input chamber, the input chamber enters the output chamber through the valve hole of the partition wall, Pressurized air is output from this output chamber to piping connected to a control device or the like.

  At this time, when the pressure in the output chamber becomes equal to or higher than the set pressure, the pressure adjusting spring is compressed and the diaphragm moves toward the exhaust chamber. Then, the 2nd valve body pressed by the valve hole of the valve plate fixed to the diaphragm also moves toward an exhaust chamber, and the 1st valve body closes the valve hole formed in the partition. When the diaphragm further moves toward the exhaust chamber, the valve hole of the valve plate and the second valve body are also separated. Thus, when the first on-off valve is closed and the second on-off valve is opened, the pressurized air in the output chamber enters the exhaust chamber through the valve hole of the valve plate and is released to the outside of the pressure reducing valve. As a result, the pressurized air in the output chamber is depressurized. As a result, the pressurized air that has been automatically depressurized to the set pressure is output from the output chamber to a pipe connected to a control device or the like.

  In such a diaphragm type pressure reducing valve, the stem of the poppet valve is inserted and supported in a through hole provided in the partition wall so as to be movable in the axial direction, and pressurized air passes through the gap between the through hole and the stem. In addition, there is a problem that the poppet valve tends to vibrate in a direction perpendicular to its axis. Therefore, various proposals for suppressing vibration of the poppet valve have been conventionally made (see, for example, Patent Documents 1 to 4).

  For example, in Patent Document 1, a spring is provided between the other end portion of the poppet valve and the partition wall through which the poppet valve is inserted and supported, and the other end portion is biased toward the diaphragm side, and the diaphragm in a direction away from the poppet valve is provided. It has been proposed to prevent vibration by providing a stopper that restricts the movement of the valve and always pressing the valve plate against the second valve body of the poppet valve. In Patent Document 2, it is proposed to prevent vibration by supporting the poppet valve by a leaf spring from its side surface. Further, Patent Documents 3 and 4 propose to prevent vibration by forming a concave guide on the poppet valve side and a convex guide on the valve hole side to restrict the movement of the poppet valve.

JP 2000-120896 A JP-A-8-31818 Japanese Utility Model Publication No. 5-40668 JP-A-11-311349

  However, the conventional pressure reducing valve described above has the following problems.

  First, in Patent Document 1, since the valve plate is always pressed against the second valve body of the poppet valve, the urging of the valve plate cannot be released, and as a result, the interior of the pressure reducing valve cannot be brought to atmospheric pressure. there were. For this reason, if pipes and equipment are disassembled assuming that the pressure is released, fluid may be ejected. Furthermore, Patent Document 1 describes that the valve plate is always pressed against the second valve body of the poppet valve. However, when the pressure in the output chamber rises further, the valve of the second valve body and the valve plate is described. There is no disclosure about the separation of the holes. When the second valve body and the valve hole of the valve plate are separated from each other, in Patent Document 1, the pressurized air passes through the gap between the through hole and the stem. It is thought that it will vibrate in the vertical direction.

  In Patent Document 2, when the flow rate is small, the movement distance in the axial direction of the poppet valve is small, which can be accommodated. However, when the flow rate is large, the movement distance becomes long. However, it is difficult to prepare a leaf spring capable of satisfying the requirements, and the structure of the pressure reducing valve must be enlarged if it is to be realized. In addition, since a plate-like spring is present in the fluid passage path, the fluid flow becomes unstable when the fluid contacts the spring.

  Furthermore, in Patent Documents 3 and 4, when the flow rate is small, the diameter of the valve seat is small, so that it can be easily applied. Is difficult to apply, and the structure of the pressure reducing valve must be enlarged if it is to be realized.

  Thus, all the conventional pressure reducing valves have problems and are not realistic. For this reason, a pressure reducing valve that can more easily suppress vibration of the poppet valve has been desired.

  Therefore, an object of the present invention is to provide a pressure reducing valve that can more easily suppress vibration of the poppet valve.

  In order to solve the above-described problems, the pressure reducing valve according to the present invention is separated by a partition into a first space serving as an input chamber and a second space serving as an output chamber and an exhaust chamber. Provided in the second space, and a container formed with an input flow path that communicates the input destination of the pressurized gas and an output flow path that communicates the output chamber and the output destination of the pressurized gas. A diaphragm that separates the space between the output chamber and the exhaust chamber on the partition wall side, a valve plate that is coupled to the diaphragm and has a valve hole that communicates the output chamber and the exhaust chamber, and the valve plate that faces the output chamber. A first biasing member for biasing, a shaft portion formed in the partition wall and inserted and supported in a through hole communicating with the input chamber and the output chamber, formed at one end of the shaft portion, and on the input chamber side of the through hole 1st valve body which closes the formed valve seat, and it is formed in the other end of a shaft part, and is arranged opposite to a valve hole. A poppet valve having the second valve body, a second urging member for urging the second valve body toward the output chamber, and an end of the through hole on the output chamber side; And a regulating member that regulates the movement of the second valve body in a direction perpendicular to the axial direction of the portion.

  In the pressure reducing valve, the regulating member may be an O-ring.

  In the pressure reducing valve, the diameter of the second valve body in the direction perpendicular to the axial direction may be larger than the diameter in the direction perpendicular to the axial direction of the shaft portion.

  In the pressure reducing valve, the partition wall may be formed with a connection flow path that communicates the inside of the through hole and the output chamber.

  According to the present invention, by including a restricting member that is disposed at the end of the through hole on the output chamber side and restricts the movement of the second valve body in the direction perpendicular to the axial direction of the shaft portion, Since the movement of the second valve body in the vertical direction is suppressed, vibration of the poppet valve can be suppressed.

FIG. 1 is a cross-sectional view showing a configuration of a pressure reducing valve according to an embodiment of the present invention. FIG. 2 is an enlarged view of a main part of FIG. FIG. 3 is a cross-sectional view for explaining the operation of the pressure reducing valve according to the embodiment of the present invention. FIG. 4 is a cross-sectional view for explaining the operation of the pressure reducing valve according to the embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Composition of pressure reducing valve]
As shown in FIGS. 1 and 2, the pressure reducing valve 1 according to the embodiment is arranged on a bottomed cylindrical filter cover 2 and the filter cover 2, and a partition wall 31 is formed therein. A cylindrical center body 3, a diaphragm 4 disposed on the center body 3 so as to cover an upper opening of the center body 3, and a hooded tubular bonnet 5 disposed on the diaphragm 4 are provided. ing. Here, a container is constituted by the filter cover 2, the center body 3 and the bonnet 5. The inside of the container is separated by a partition wall 31 into a first space serving as the input chamber 6 and a second space serving as the output chamber 7 and the exhaust chamber 8. The input chamber 6 is formed between the filter cover 2 and the partition wall 31, and pressurized air is input from the outside. The output chamber 7 is formed between the partition wall 31 and the diaphragm 4, and outputs pressurized air input from the input chamber 6 to an external control device or the like through a through hole 32 formed in the partition wall 31. . Further, the exhaust chamber 8 is formed between the diaphragm 4 and the bonnet 5, and pressurizes the pressurized air input from the output chamber 7 through a through hole 18 b of an exhaust port 18 (described later) fixed to the diaphragm 4. 1 is exhausted to the outside.

  The filter cover 2 is a bottomed cylindrical member and is made of, for example, aluminum. A drain bolt 9 is screwed to the bottom of the filter cover 2.

  Such a filter cover 2 is inserted into the flange 2a in a state where the flange 2a formed at the end on the top side is in contact with the outer edge of the center body 3 on the input chamber 6 side via the gasket 10. The bolt 11 is fixed to the center body 3. At this time, between the opening on the filter cover 2 side of the center body 3 and the opening on the top side of the filter cover 2, a filter 12 made of dust removal sponge, stainless mesh or the like is provided.

  The center body 3 is a cylindrical member and is made of, for example, aluminum. The inside of the center body 3 is separated into two spaces by a partition wall 31 along a direction orthogonal to the axis. A through hole 32 is formed at the center of the partition wall 31 along the axis of the center body 3, and the cross section of the through hole 32 in a direction perpendicular to the axis is substantially circular.

  A poppet valve 13 made of, for example, brass or stainless steel is inserted and supported in the through hole 32. The poppet valve 13 includes a columnar stem 13a, a first truncated cone-shaped valve body 13b that is formed at one end of the stem 13a on the input chamber 6 side and extends in a trumpet shape toward the end. The second valve element 13c is formed at the other end of the output chamber 7 on the side of the output chamber 7 and has a columnar shape with a diameter larger than that of the stem 13a and a hemispherical open end. Here, the outer diameter of the stem 13a is formed smaller than the inner diameter of the through hole 32 so that pressurized air flows between the stem 13a and the through hole 32. The outer diameter of the first valve body 13b is formed larger than the inner diameter of the through hole 32 so as to contact a valve seat 32a of the through hole 32 described later. The outer diameter of the second valve body 13 c is formed to be equal to or smaller than the inner diameter of the through hole 32 so that the second valve body 13 c can move in the through hole 32.

A valve seat 32a is formed at the end of the through hole 32 on the input chamber 6 side, and the first valve body 13b of the poppet valve 13 abuts on the valve seat 32a.
On the other hand, at the end of the through-hole 32 on the output chamber 7 side, an O-ring receiver 32b made of a cylindrical recess having a larger diameter than the through-hole 32 is formed on the output chamber 7 side of the O-ring receiver 32b. The O-ring retainer 32c having a larger diameter than the O-ring receiver 32b is formed.

In the O-ring receiver 32b, an O-ring 14 made of, for example, nitrile rubber is disposed concentrically with the poppet valve 13 or the O-ring receiver 32b. A second valve body 13c of the poppet valve 13 is inserted into the O-ring 14 so as to be slidable in the axial direction of the poppet valve 13a. Accordingly, the inner diameter of the O-ring 14 is such that the second valve body 13c can slide in the axial direction of the stem 13a, in other words, the second valve body 13c can move smoothly in the axial direction of the poppet valve 13. And it is formed in the magnitude | size which can suppress the movement of the 2nd valve body 13c to the direction perpendicular | vertical with respect to the axial direction. Specifically, the inner diameter of the O-ring 14 is equal to the outer diameter of the second valve body 13c or outside of the second valve body so that the second valve body 13c slides relative to the O-ring 14. It is formed slightly smaller than the diameter.
The O-ring retainer 32c is provided with a disk-shaped O-ring retainer 15 made of, for example, stainless steel. The second valve body 13 c is also inserted through the O-ring presser 15. The inner diameter of the O-ring press 15 is formed larger than the outer diameter of the second valve body 13c of the poppet valve 13 so as not to hinder the movement of the second valve body 13c.

  A cylindrical support portion 33 is erected around the through hole 32 on the surface of the partition wall 31 on the input chamber 6 side, and a poppet spring receiver 16 is supported at the lower end of the support portion 33. A poppet spring 17 is disposed between the poppet spring receiver 16 and the first valve body 13 b of the poppet valve 13. The poppet spring 17 is made of, for example, a stainless coil spring and biases the poppet valve 13 toward the output chamber 7. Thus, the second valve body 13c of the poppet valve 13 protrudes from the surface of the partition wall 31 on the output chamber 7 side.

The center body 3 has an input channel 34 having one end opened on the outer surface of the center body 3 and the other end opened on the surface of the partition wall 31 on the input chamber 6 side, and one end in the axial direction of the through hole 32. An output channel 35 having an opening in the substantially central portion and the other end opened in the outer surface of the center body 3, one end opened in the output channel 35, and the other end opened in the surface of the partition wall 31 on the output chamber 7 side. A discharge channel 36 is formed. Here, the output flow path 35 functions as an output flow path and a connection flow path. Moreover, the connection flow path 35, the discharge flow path 36, and the output chamber 7 function as an output chamber.
Further, a pipe (not shown) for inputting pressurized air from the outside is connected to the opening of the outer surface of the center body 3 in the input flow path 34. Further, a pipe (not shown) for sending pressurized air to the control device or the like is connected to the opening on the outer surface of the center body 3 in the output flow path 35.

  The diaphragm 4 is a disk-shaped member, and is formed of, for example, nitrile rubber. The outer diameter of the diaphragm 4 is formed to be equal to the outer diameter of the upper surface of the center body 3. Such a diaphragm 4 is disposed between the center body 3 and the bonnet 5 in a state where the outer edge is sandwiched between the end of the center body 3 on the output chamber 7 side and the opening edge on the bottom side of the bonnet 5. Established. Thereby, the diaphragm 4 separates the output chamber 7 and the exhaust chamber 8.

  An exhaust port 18 that functions as a valve plate is disposed on the output chamber side surface of the diaphragm 4. The exhaust port 18 is a disk-shaped member and is made of, for example, brass. The outer diameter of the exhaust port 18 is smaller than the outer diameter of the diaphragm 4 and the opening of the center body 3 on the output chamber 7 side. A columnar convex portion 18a is formed at the central portion of the surface of the exhaust port 18 on the side in contact with the diaphragm 4, and this convex portion 18a is inserted through a through hole formed at the central portion of the diaphragm 4. It protrudes from the surface of the diaphragm 4 on the exhaust chamber 8 side. Further, a through hole 18b extending along the axis is formed in the central portion of the exhaust port 18. Thus, the output chamber 7 and the exhaust chamber 8 separated by the diaphragm 4 are communicated with each other through the through hole 18b. A valve seat 18c disposed opposite to the second valve body 13c of the poppet valve 13 is formed at the end of the through hole 18b on the output chamber side. Therefore, when the diaphragm 4 moves to the output chamber 7 side, the valve seat 18c comes into contact with the second valve body 13c.

  An area plate 19 is disposed on the surface of the diaphragm 4 on the exhaust chamber 8 side. The area plate 19 is a disk-shaped member, and is formed of, for example, brass. The outer diameter of the area plate 19 is smaller than the outer diameter of the diaphragm 4 and the bottom opening of the bonnet 5 described later. Such an area plate 19 is fixed to the upper surface of the diaphragm 4 in a state where the convex portion 18a of the exhaust port 18 is inserted into a through hole formed in the center portion. Further, a pressure adjusting spring 23 described later is in contact with the upper surface of the area plate 19.

  The bonnet 5 is a celestial cylindrical member made of, for example, aluminum. The bonnet 5 has the diaphragm 4 mounted on the diaphragm 4 placed on the upper portion of the center body 3 with the flange 5a formed on the lower end portion of the bonnet 5 being put on the diaphragm 4 by a bolt 20 inserted into the flange 5a. Via the center body 3. As a result, an exhaust chamber 8 is formed between the diaphragm 4 and the bonnet 5. The exhaust chamber 8 communicates with the outside through an exhaust hole 5 b formed in the side wall of the bonnet 5.

A pressure adjustment knob 21 is screwed to the top of the bonnet 5. The pressure adjusting knob 21 includes a knob 21a and a shaft 21b having one end fixed to the knob 21a and the other end positioned in the bonnet 5. The shaft 21b is movable in the axial direction of the bonnet 5. 5 is screwed to the top.
Inside the bonnet 5, a pressure adjusting spring receiver 22 made of, for example, steel is disposed near the other end of the shaft 21 b of the pressure adjusting knob 21, and the area plate 19 fixed to the pressure adjusting spring receiver 22 and the diaphragm 4. Between the two, a pressure regulating spring 23 made of, for example, a coil spring formed of a spring steel material is disposed.

[Operation of pressure reducing valve]
Next, the operation of the pressure reducing valve 1 according to the present embodiment will be described.

First, the pressure of air output from the pressure reducing valve 1 is set in advance. This setting is performed by operating the pressure adjustment knob 21.
When the pressure adjusting knob 21 is screwed toward the bonnet 5, the other end of the shaft 21 b presses the pressure adjusting spring 23 toward the diaphragm 4 via the pressure adjusting spring receiver 22. Then, the diaphragm 4 moves toward the output chamber 7, and the valve seat 18 c of the exhaust port 18 fixed to the diaphragm 4 is protruded from the through hole 32 on the output chamber 7 side. Abut. When the pressure adjusting knob 21 is further screwed in, as shown in FIG. 3, the poppet valve 13 moves toward the input chamber 6, and the first valve body 13b is formed at the end of the through hole 32 on the input chamber 6 side. Separated from the valve seat 32a. Thereby, the input chamber 6 and the output flow path 35 communicate with each other through the through hole 32.
At this time, the diaphragm 4 and the exhaust port 18 do not move to the exhaust chamber 8 side unless pressure exceeding the pressure received from the pressure adjusting spring 23 is received from the bottom surface side. The pressure increases as the pressure adjusting knob 21 is screwed and the pressure adjusting spring 23 receives a force in the compression direction.
In this way, by adjusting the screwing amount of the pressure adjusting knob 21, that is, the degree of urging the diaphragm 4 and the exhaust port 18 by the pressure adjusting spring 23, the pressure of the pressurized air output from the output chamber 7 (hereinafter referred to as the pressure) , Referred to as “set pressure”).

  When the first valve body 13b and the valve seat 32a are in a separated state, the pressurized air supplied into the input chamber 6 from a pipe connected to the input flow path 34 is the first valve body 13b. And the valve seat 32a through the through-hole 32 to reach the output flow path 35, and output from the output flow path 35 to piping or the like. This output flow path 35 communicates with the output chamber 7 via the discharge flow path 36. Therefore, the pressure in the output chamber 7 (hereinafter referred to as “output pressure”) depends on the pressure in the output flow path 35.

  Here, when the output pressure does not exceed the set pressure, the diaphragm 4 does not move. Therefore, the valve seat 18c of the exhaust port 18 fixed to the diaphragm 4 is in contact with the first valve body 13b of the poppet valve 13. Is maintained. Therefore, the pressurized air that reaches the output flow path 35 is output from the output flow path 35 as it is.

  On the other hand, when the output pressure exceeds the set pressure, first, the diaphragm 4 moves to the exhaust chamber 8 side, and the poppet valve 13 also moves to the output chamber 7 side with this movement, and the first valve body of the poppet valve 13 is moved. 13 b closes the valve seat 32 a of the through hole 32. Then, since the space between the input chamber 6 and the output flow path 35 is blocked, pressurized air is not supplied to the output flow path 35 and the output chamber 7 from the input chamber 6 side. This prevents further increase in output pressure.

  At this time, if the diaphragm 4 further moves to the exhaust chamber 8 side due to the high output pressure, the valve seat 18c of the exhaust port 18 and the second valve body 13c of the poppet valve 13 are separated as shown in FIG. Then, the output chamber 7 and the exhaust chamber 8 communicate with each other through the through hole 18 b of the exhaust port 18. Then, since the internal pressure of the exhaust chamber 8 is lower than the internal pressure of the output chamber 7, the pressurized air in the output chamber 7 flows into the exhaust chamber 8 through the through holes 18 b and exhausts from the hood 5. It is discharged to the outside from the hole 5b. As a result, the output pressure decreases.

  When the output pressure becomes lower than the set pressure by discharging the pressurized air from the exhaust hole 5b, the diaphragm 4 is moved to the output chamber 7 side by the pressure adjusting spring 23, and the valve seat 18c of the exhaust port 18 is moved to the poppet valve. 13 is contacted with the second valve body 13c, and the through hole 18b of the exhaust port 18 is closed. Thereby, the discharge of the pressurized air from the exhaust hole 5b is stopped. When the output pressure further decreases, as described above, the poppet valve 13 whose second valve body 13c is pressed by the valve seat 18c of the exhaust port 18 moves toward the input chamber 6, and the first valve body 13b. Is separated from the valve seat 32a formed at the end of the through hole 32 on the input chamber 6 side.

  As described above, the movement of the diaphragm 4 according to the vertical relationship between the output pressure and the set pressure causes the poppet valve 13 to move in the axial direction, or the exhaust port 18 fixed to the diaphragm 4 has the second position of the poppet valve 13. Or collide with the valve body 13c. Therefore, the poppet valve 13 is likely to vibrate in a direction perpendicular to the axial direction, but the O-ring 14 into which the second valve body 13c of the poppet valve 13 is inserted into the end portion of the through hole 32 on the output chamber 7 side. Therefore, the movement of the second valve body 13c of the poppet valve 13 in the direction orthogonal to the axis thereof is restricted. Thereby, the vibration of the poppet valve 13 can be suppressed.

  In addition, a second valve body 13c of the poppet valve 13 and an O-ring 14 are provided at the end portion on the output chamber 7 side of the through hole 32 through which the poppet valve 13 is inserted and supported. For this reason, the pressurized air input from the input chamber 6 to the through hole 32 does not pass through the gap between the second valve body 13 c and the O-ring 14, and an output flow in which one end is connected to the central portion of the through hole 32. It is output to the path 35. Thus, since pressurized air does not pass between the 2nd valve body 13c and the O-ring 14, the vibration of the poppet valve 13 can be suppressed.

Further, since the contact area between the O-ring and the second valve body 13c can be increased by making the outer diameter of the second valve body 13c larger than that of the stem 13a, the frictional force between them increases, resulting in a result. As a result, vibration of the poppet valve 13 can be suppressed.
Furthermore, by making the outer diameter of the second valve body 13c larger than that of the stem 13a, the contact area of the exhaust port 18 in contact with the second valve body 13c with the valve seat 18c can be increased. As a result, the vibration of the poppet valve 13 can be suppressed.

Further, by providing the O-ring 14, vibration of the poppet valve 13 can be suppressed without always pressing the poppet valve 13 against the exhaust port 18, so that the inside of the pressure reducing valve can be easily brought to atmospheric pressure. Thereby, since the pressure release state can be detected accurately, it is possible to prevent the fluid from being ejected when the pipe or the device is disassembled.
Moreover, since it is only necessary to provide the O-ring 14 at the end of the through hole 32 on the output chamber 7 side, vibration of the poppet valve 13 can be suppressed without increasing the size of the pressure reducing valve.
Furthermore, since there is no plate-like member in the passage path of the pressurized air such as the through hole 32, the flow of the pressurized air can be stabilized.

  As described above, according to the present embodiment, the second valve body 13c of the poppet valve 13 is slidable in the axial direction of the stem 13a, disposed at the end of the through hole 32 on the output chamber 7 side. Since the movement of the second valve body 13c in the direction perpendicular to the axis of the stem 13a is restricted by providing the O-ring 14 inserted into the second valve body 13c, the vibration of the poppet valve 13 can be suppressed.

  In the present embodiment, the case where the O-ring 14 is used as the restricting member has been described as an example. However, the movement of the second valve body 13c in the direction perpendicular to the axis of the stem 13a can be restricted. In this case, the restricting member is not limited to the O-ring, and various structures can be applied. For example, you may make it form the three convex parts which protrude toward the 2nd valve body 13c at equal intervals around the axis line of the stem 13a in the edge part by the side of the output chamber 7 of the through-hole 32. FIG.

  Further, in the present embodiment, the case where the O-ring 14 is used as the restricting member has been described as an example, but if the ring-shaped member can be slidably inserted in the axial direction of the stem 13a, Members other than the O-ring 14 may be used. For example, the planar shape in the direction perpendicular to the axial direction of the ring-shaped member and the stem 13a of the second valve body 13c may be a polygon such as a triangle or a rectangle, or an ellipse.

  In the present embodiment, the case where air is used as the pressurized gas input / output to / from the pressure reducing valve 1 has been described as an example. Instead, various gases can be used.

  The present invention can be applied to a pressure reducing valve that decompresses a gas such as air.

  DESCRIPTION OF SYMBOLS 1 ... Pressure reducing valve, 2 ... Filter cover, 3 ... Center body, 4 ... Diaphragm, 5 ... Bonnet, 5a ... Flange, 5b ... Exhaust hole, 6 ... Input chamber, 7 ... Output chamber, 8 ... Exhaust chamber, 9 ... Drain Bolt, 10 ... Gasket, 11 ... Bolt, 12 ... Filter, 13 ... Poppet valve, 13a ... Stem, 13b ... First valve body, 13c ... Second valve body, 14 ... O-ring, 15 ... O-ring presser , 16 ... Poppet spring receiver, 17 ... Poppet spring, 18 ... Exhaust port, 18a ... Projection, 18b ... Through hole, 18c ... Valve seat, 19 ... Area plate, 20 ... Bolt, 21 ... Pressure adjusting knob, 21a ... Knob 21b ... Shaft, 22 ... Pressure adjusting spring receiver, 23 ... Pressure adjusting spring, 31 ... Bulkhead, 32 ... Through hole, 32a ... Valve seat, 32b ... O-ring receiver, 32c ... O-ring presser receiver, 33 Support part, 34 ... input channel, 35 ... output channel, 36 ... exhaust passage.

Claims (4)

An input flow path and an output chamber, which are separated by a partition into a first space serving as an input chamber and a second space serving as an output chamber and an exhaust chamber, and communicates the input chamber with an input destination of pressurized gas. And a container having an output flow path communicating with the output destination of the pressurized gas,
A diaphragm which is provided in the second space and separates the second space into the output chamber and the exhaust chamber on the partition wall side;
A valve plate coupled to the diaphragm and formed with a valve hole communicating the output chamber and the exhaust chamber;
A first biasing member that biases the valve plate toward the output chamber;
A shaft portion formed in the partition wall and inserted and supported in a through hole communicating with the input chamber and the output chamber, and formed at one end of the shaft portion, and closes a valve seat formed on the input chamber side of the through hole. A poppet valve having a first valve body and a second valve body formed at the other end of the shaft portion and disposed opposite to the valve hole;
A second biasing member that biases the second valve body toward the output chamber;
A regulating member disposed at an end portion of the through hole on the output chamber side and regulating movement of the second valve body in a direction perpendicular to an axial direction of the shaft portion. Pressure reducing valve. The pressure reducing valve according to claim 1,
The pressure reducing valve, wherein the restricting member comprises an O-ring. The pressure reducing valve according to claim 1 or 2,
The pressure reducing valve characterized in that a diameter of the second valve body in a direction perpendicular to the axial direction is larger than a diameter of the shaft portion in a direction perpendicular to the axial direction. The pressure reducing valve according to any one of claims 1 to 3,
The pressure reducing valve characterized in that a connecting flow path is formed in the partition wall to communicate the inside of the through hole and the output chamber.

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