JP3725044B2 - Pressure reducing valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pressure reducing valve capable of reducing a high pressure gas flowing in from a gas inlet to a low pressure, taking it out from a gas outlet, and supplying fresh gas such as liquefied gas or compressed gas in a reverse direction from the gas outlet to the gas inlet.
[0002]
BACKGROUND OF THE INVENTION
The pressure reducing valve communicates its gas outlet to the working chamber, and when the pressure at the gas outlet becomes high, the pressure reducing member is moved in the closing direction by the closing force due to the pressure in the working chamber, whereby the gas taken out from the gas outlet of the pressure reducing valve The pressure is reduced. For this reason, when trying to flow the high pressure fresh gas from the gas outlet of the pressure reducing valve to the gas inlet in the reverse direction, the high pressure gas in the gas outlet flows into the working chamber and the pressure reducing member moves in the closing direction, The pressure reducing valve closes. Therefore, when supplying a high-pressure fresh gas to a gas cylinder equipped with this type of pressure reducing valve, for example, a gas filling path that bypasses the pressure reducing valve is formed or communicated with the pressure reducing valve so that the fresh gas does not pass through the pressure reducing valve. It was necessary to provide a gas filling port separately from the gas outlet to be used.
[0003]
[Prior art]
Conventionally, there is a pressure reducing valve disclosed in, for example, Japanese Patent Application Laid-Open No. 9-170672 as a pressure reducing valve configured to solve the above-described problems and fill a gas cylinder through a pressure reducing valve through a pressure reducing valve.
[0004]
That is, the pressure reducing valve includes a pressure reducing valve chamber in the housing, an inlet passage for allowing the extracted gas to flow into the pressure reducing valve chamber, an outlet passage for discharging the extracted gas from the pressure reducing valve chamber, and a gas from the outlet passage. A pressure reducing member inserted into the pressure reducing valve chamber for controlling the outflow. The decompression member has a piston member including a first piston at the proximal portion and a second piston having a larger diameter and a distal portion. Furthermore, it has a biasing means for biasing the piston member in the valve opening direction. In addition, a working chamber is formed on the distal side of the second piston, and the working chamber communicates with the outlet passage via a communication path.
[0005]
The extracted gas flowing in from the inlet passage moves the piston member in the valve opening direction together with the urging means, and flows out to the outlet passage from the gap between the pressure reducing member and the pressure reducing valve seat facing the pressure reducing member. Is done. The pressure of the gas taken out from the outlet passage is transmitted to the working chamber via the communication passage, and the pressure in the working chamber presses the second piston to push the piston member back in the valve closing direction.
A movable means is disposed in the communication path so as to be able to slide tightly and is urged toward the exit path by a spring.
[0006]
When a high-pressure fresh gas is filled into a gas cylinder equipped with this pressure reducing valve, a filling fitting provided with a pressing portion at the tip is attached to the outlet passage, and the movable means is inserted into the outlet passage with the pressing portion inserted into the outlet passage. Press. By this pressing, the movable means moves to the working chamber side against the urging force of the spring, and its end portion comes into contact with the housing by the movement to prevent the fresh gas from flowing into the working chamber. . As a result, the force in the valve closing direction is prevented from being applied to the second piston, and the pressure reducing valve is maintained in an open state, so that the high pressure fresh gas flows through the pressure reducing valve into the gas cylinder.
[0007]
[Problems to be solved by the invention]
The above prior art is excellent in that it can be filled with fresh gas through a pressure reducing valve, and there is no need to provide a filling path that bypasses the pressure reducing valve, but has the following problems.
(1) In order to prevent the flow of fresh gas from the gas outlet to the working chamber during filling, it is necessary to provide movable means in the communication path so as to be able to slide in a coherent manner, and the structure of the pressure reducing valve becomes complicated.
In order to solve this problem, it is conceivable that the movable means is constituted by a part of the piston member. However, the movable means prevents the gas from flowing into the working chamber by moving in the valve opening direction, while the piston member is urged in the valve opening direction by the urging means. Therefore, if the movable means is constituted by a part of the piston member, the piston member moves to the valve opening side when the gas is taken out from the gas cylinder, and the taken-out gas does not flow into the working chamber, so that the pressure cannot be reduced.
[0008]
(2) Since the piston member and pressure reducing member are urged in the valve opening direction by the urging means, if the stop valve is opened when the gas in the gas cylinder is used up, the atmosphere flows into the gas cylinder. There is a risk of doing. In order to prevent this air from entering, if a check valve for residual pressure is installed so that the minimum pressure is maintained in the gas cylinder even after use, the structure of the entire valve device becomes complicated.
[0009]
(3) In order to press the movable means in the communication passage when fresh gas is charged, a pressing portion provided at the tip of the filling fitting is inserted into the outlet passage. The movable means needs to be pressed firmly in order to prevent the fresh gas from flowing into the working chamber from the outlet passage. For this reason, the pressing portion needs a predetermined thickness. The outlet path into which the pressing part is inserted needs to have a larger cross-sectional area than the pressing part so that a gas filling path can be secured between the outlet part and the inserted pressing part, and the outlet path is sealed. The sealing area of the decompression member is also increased. The first piston has a cross-sectional area larger than the sealing area of the pressure reducing member so that the first piston can move in the valve opening direction with the gas pressure flowing into the pressure reducing valve chamber when the gas is taken out. Since the two pistons have a larger diameter than the first piston, the pressure reducing valve is considerably enlarged according to the thickness of the pressing portion.
The present invention aims to solve the above problems and provide a pressure reducing valve having a simple structure and a compact structure.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, the present invention has a pressure reducing valve configured as follows, for example, as shown in FIGS. 1 to 3 showing an embodiment of the present invention.
That is, a gas inlet (7a) and a gas outlet (7b) are opened in a pressure reducing valve chamber (14) formed in the housing ( 3 ) , and a pressure reducing valve seat (18) is formed around the gas outlet (7b). Then, sandwiching the pressure reducing member (17) inserted into the pressure reducing valve chamber (14) , a working chamber (29) is formed on the side opposite to the gas inlet (7a), and the pressure reducing member (17) has a gas inlet and the first piston (26) which receives the pressure (7a) than this to form the second piston receiving the pressure of the working chamber (29) with large diameter (27), said reduced pressure member (17) in in providing the communicating passage (30), the communication path through the (30) communicates said working chamber (29) to said gas outlet (7b), at the time of gas extraction, the pressure of the gas inlet (7a) The pressure reducing member (17) is separated from the pressure reducing valve seat (18), and the pressure reducing member (17) is configured to be close to the pressure reducing valve seat (18) by the pressure of the working chamber (29). During filling, from the filling nozzle (34) having the sealing tool (41) A pressure reducing valve configured to supply the fresh gas from the gas outlet (7b) to the gas inlet (7a) in the reverse direction,
The end face facing the said gas outlet (7b) of the circumferential wall (30a) of said communication passage (30), the sealed portion capable of blocking the communication between the working chamber above the gas outlet (7b) (43) setting only, when the above filling nozzle (34) is mounted, toward this sealed portion (43) above the sealing member (41) from the gas outlet (7b) above the working chamber (29) The fresh gas is prevented from flowing into the working chamber (29) by sealing contact.
[0011]
[Action]
The present invention operates as follows.
When the gas is taken out from the gas inlet and into the pressure reducing valve chamber, the first piston is pressed by the gas pressure and the pressure reducing member is separated from the pressure reducing valve seat. As a result, the extracted gas flows out from the gap between the decompression member and the decompression valve seat while being decompressed to the gas outlet. The pressure of the extracted gas that has flowed out to the gas outlet is transmitted to the working chamber via the communication path, and the pressure in the working chamber presses the second piston having a large diameter to push the pressure reducing member back toward the pressure reducing valve seat. Due to the closing force due to the gas pressure in the working chamber and the opening force due to the gas pressure at the gas inlet, the pressure reducing member is close to or away from the pressure reducing valve seat, and the pressure of the extracted gas flowing out from the gas outlet is reduced. Is done.
[0012]
On the other hand, when supplying fresh gas from the gas outlet of the pressure reducing valve to the gas inlet, the sealing tool provided in the filling nozzle is provided on the sealed portion provided on the end surface of the peripheral wall of the communication passage. Contact from the exit to the working chamber. As a result, the communication path is sealed with the sealing tool, and the inflow of fresh gas from the gas outlet to the working chamber is prevented. As a result, the pressure reducing member is pressed by the pressure of the fresh gas in the gas outlet and moves to the valve opening side, and the fresh gas is supplied to the gas inlet of the pressure reducing valve chamber.
[0013]
Elastic means (19) may be inserted into the working chamber (29) to press the pressure reducing member (17) toward the pressure reducing valve seat (18). In this case, when the pressure of the extracted gas flowing into the pressure reducing valve chamber from the gas inlet becomes smaller than the pressing force of the elastic means, the pressure reducing member moves to contact the pressure reducing valve seat and close the valve. That is, since the pressure reducing valve closes when the gas pressure taken out from the gas inlet becomes a predetermined residual pressure value or less, for example, the minimum pressure can be maintained in a gas cylinder provided with this pressure reducing valve. Accordingly, it is not necessary to separately provide a check valve for maintaining the residual pressure required in the conventional technique, and the pressure reducing valve can have a simple structure and can be made compact.
[0014]
Between the gas inlet (7a) and the gas outlet (7b), a cylindrical filter (15) is mounted in the outer peripheral space of the pressure reducing member (17) and the pressure reducing valve seat (18). Is preferred. In this case, the extracted gas taken out from the gas inlet to the gas outlet is filtered by the cylindrical filter. At this time, since the filter is formed in a cylindrical shape, the filtration area is wide, a fine filter can be adopted, and the filter is disposed in the vicinity of the pressure reducing member or the pressure reducing valve seat. For this reason, fine foreign matters can be effectively removed from the extracted gas flowing into the pressure reducing valve chamber, and these foreign matters are prevented from adhering to the valve surface of the pressure reducing member and the pressure reducing valve seat, thereby reducing the pressure reducing performance of the pressure reducing valve. It can be kept high for a long time.
[0015]
Embodiment
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show a first embodiment of the present invention, FIG. 1 is a cross-sectional view of a pressure reducing valve provided in a valve device, and FIG. 2 is a cross-sectional view of the pressure reducing valve in a state in which a filling fitting is mounted. .
[0016]
As shown in FIG. 1, the valve device (2) fixed to the gas cylinder (1) is provided with an inlet hole (4) and an outlet hole (5) on the outer surface of the housing (3). ) And an outlet hole (5), a pressure reducing valve (7) is provided. The pressure reducing valve (7) has a gas inlet (7a) communicated with the inlet hole (4) through an inlet passage (6), and a gas outlet (7b) through the outlet passage (8). It communicates with (5).
[0017]
The inlet passage (6) is provided with a stop valve (9) between the inlet hole (4) and the gas inlet (7a). The stop valve (9) and the inlet hole (4) Is communicated with the gas ejection hole (11) of the primary safety valve (10). The outlet hole (5) is provided on the end face of the outlet nozzle (12) formed on one side of the housing (3), and a gas extraction fitting (not shown) is connected to the outlet nozzle (12). It is possible.
[0018]
A mounting hole (13) for the pressure reducing valve (7) is recessed on the side of the housing (3) opposite to the outlet nozzle (12), and a pressure reducing valve chamber ( 14) is formed, and the gas outlet (7b) is formed in the inner wall of the mounting hole (13).
In the mounting hole (13), a cylindrical filter (15) and a cylindrical member (16) are mounted in order from the back side, and a pressure reducing member (17) is inserted inside the cylindrical member (16). . A pressure reducing valve seat (18) is formed on the opening periphery of the gas outlet (7b). The pressure reducing member (17) is disposed so as to be able to advance and retract toward the pressure reducing valve seat (18), and is elastically pressed toward the pressure reducing valve seat (18) by a spring (19) which is an elastic means.
[0019]
The mounting hole (13) is covered with a bolt-shaped lid member (20), and the tubular filter (15) and the tubular member (16) are fixed by the lid member (20). A concave portion (21) is formed on the inner surface of the lid member (20), and a spring receiver (22) is disposed in the concave portion (21) to support the spring (19). A communication hole (24) communicating with the secondary safety valve (23) provided on the outer surface of the lid member (20) is formed at the center of the spring receiver (22).
[0020]
The pressure-reducing member (17) includes a first piston (26) located in the proximal portion of the gas inlet (7a) and a second piston (27) larger in diameter and located in the distal portion. The first piston (26) slides tightly on the inner surface of the cylindrical member (16), and the second piston (27) slides tightly on the inner surface of the recess (21) of the lid member (20). Reference numeral (28) denotes an air communication hole for communicating the outer surface of the pressure reducing member (17) between the first piston (26) and the second piston (27) and the outside of the housing (3).
A working chamber (29) is formed between the second piston (27) and the lid member (20) on the distal side. A communication passage (30) is formed in a state of penetrating the pressure reducing member (17), and the working chamber (29) and the gas outlet (7b) communicate with each other through the communication passage (30). ing.
[0021]
Next, the case where gas is taken out from the gas cylinder (1) through the pressure reducing valve (7) will be described.
When the stop valve (9) is opened, the gas in the gas cylinder (1) flows into the pressure reducing valve chamber (14) from the gas inlet (7a) through the inlet passage (6), and the cylinder of the cylindrical filter (15). It is filtered through the wall. At this time, since the filter (15) is formed in a cylindrical shape, the filtration area is wide, a fine filter can be adopted, and the filter (15) is disposed in the vicinity of the pressure reducing member (17) and the pressure reducing valve seat (18). ing. For this reason, fine foreign matters are effectively removed from the extracted gas flowing into the pressure reducing valve chamber (14), and these foreign matters are prevented from adhering to the valve surface of the pressure reducing member (17) and the pressure reducing valve seat (18). Thus, the decompression performance is maintained high for a long time.
[0022]
When the pressure of the extracted gas flowing in from the gas inlet (7a) is higher than a predetermined residual pressure value, the first piston (26) is pressed against the pressing force of the spring (19), and the pressure reducing member (17) is separated from the pressure reducing valve seat (18). As a result, the pressure reducing valve (7) is opened, and the extracted gas is depressurized from the gap between the pressure reducing member (17) and the pressure reducing valve seat (18) through the gas outlet (7b) to the outlet path (8). It flows out while being done. The pressure of the gas taken out from the gas outlet (7b) is transmitted to the working chamber (29) through the communication passage (30), and the pressure in the working chamber (29) presses the second piston (27). The pressure reducing member (17) is pushed back toward the pressure reducing valve seat (18). Thereby, the pressure of the extraction gas flowing out from the gas outlet (7b) is equal to the pressure of the extraction gas applied to the first piston (26) and the gas pressure of the working chamber (29) applied to the second piston (27). The pressure is reduced in balance with the resultant force applied with the elastic pressure of the spring (19), and it is taken out from the outlet hole (5).
[0023]
When the pressure in the gas outlet (7b) rises abnormally and becomes higher than the set pressure of the secondary safety valve (23), the gas flowing into the working chamber (29) passes through the communication hole (24). The safety member (31) of the secondary safety valve (23) is pressed, and the secondary safety valve (23) is opened against the pressing force of the safety spring (32). As a result, part of the abnormally raised gas is released to the outside, and the pressure in the gas outlet (7b) and the outlet passage (8) is reduced to a safe set value or less.
[0024]
When the gas remaining in the gas cylinder (1) decreases as the gas is consumed, and the pressure of the extracted gas flowing into the pressure reducing valve chamber (14) from the inlet passage (6) becomes lower than a predetermined residual pressure value, The gas pressure for pressing the first piston (26) becomes weaker than the pressing force of the spring (19). As a result, the pressure reducing member (17) is pressed against the pressure reducing valve seat (18), the pressure reducing valve (7) is closed, and the gas extraction is stopped while a predetermined residual pressure is maintained in the gas cylinder (1). Is done.
[0025]
Next, a gas filling apparatus for filling the gas cylinder (1) with liquefied gas or compressed gas will be described.
As shown in FIG. 2, the filling metal fitting (33) of the gas filling device is attached to the outlet nozzle (12) of the housing (3). That is, the filling nozzle (34) of the filling metal fitting (33) is screwed into the outlet nozzle (12) and connected in a tightly-tight manner. A filling passage (35) is formed in the filling nozzle (34), and the filling passage (35) communicates with the gas outlet (7b) through the outlet passage (8) by the connection.
[0026]
A mounting hole (36) is recessed at the tip of the filling nozzle (34), and a rod-shaped pressing member (37) is mounted in the mounting hole (36) so as to be able to advance and retract. This pressing member (37) is elastically pressed to the tip side (right side in FIG. 2) by a biasing spring (38), and a middle part thereof is a sleeve (39) screwed to the nozzle tip (45) of the filling nozzle (34). Is supported. The pressing member (37) is provided with a protrusion (40), and the protrusion (40) protrudes from the nozzle tip (45) toward the pressure reducing member (17). A sealing tool (41) made of an elastic material is fixed to the tip of the protruding part (40), and a sealing part (44) is formed on the shoulder on the tip side of the sealing tool (41). It is.
[0027]
When the filling metal fitting (33) is attached to the outlet nozzle (12), the protrusion (40) is inserted into the outlet passage (8). The protrusion (40) has a smaller diameter than the inner diameter of the outlet passage (8), and a fresh gas flow passage (42) is formed around the protrusion (40) in the outlet passage (8). . The sleeve (39) is provided with a gas discharge port (46) on the nozzle tip side, and the filling passage (35) passes through the gas discharge port (46) and the flow passage (42). It communicates with the gas outlet (7b).
[0028]
The communication passage (30) penetrating the pressure reducing member (17) of the pressure reducing valve (7) is formed on substantially the same straight line as the outlet passage (8). On the peripheral wall (30a) of the communication passage (30), there is a sealed portion (43) having an outer conical surface that is smaller than the passage cross section of the outlet passage (8) on the end surface on the gas outlet (7b) side. It is formed to face the gas outlet (7b).
[0029]
By attaching the filling fitting (33), the sealing portion (44) of the sealing tool (41) fixed to the tip of the protruding portion (40) is connected to the sealed portion (43) from the gas outlet (7b). It contacts toward the said working chamber (29), and seals a communicating path (30). At the same time, the pressure reducing member (17) is pushed rightward in the figure by the pressing force of the biasing spring (38), and the pressure reducing valve (7) is opened. In this state, when the stop valve (9) is opened and fresh gas is introduced from the filling passage (35) of the filling fitting (33), the fresh gas passes through the flow passage (42) in the outlet passage (8). And flows into the pressure reducing valve chamber (14) from the gas outlet (7b). At this time, since the pressing member (37) receives the pressure of the fresh gas in addition to the pressing force of the biasing spring (38), the sealing portion (44) of the sealing tool (41) is connected to the sealed portion (43). The communication path (30) is reliably sealed by being firmly pressed.
[0030]
Due to the fresh gas flowing into the pressure reducing valve chamber (14), pressure in the valve opening direction is applied to the first piston (26). At this time, since the communication path (30) is sealed by the sealing tool (41), fresh gas does not flow into the working chamber (29), and the second piston (27) in the valve closing direction. Since the gas pressure to push back is not applied, the pressure reducing valve (7) is maintained in the open state. As a result, fresh gas flows from the filling passage (35) to the gas discharge port (46), the flow passage (42) in the outlet passage (8), the gas outlet (7b), the pressure reducing valve chamber (14), the gas inlet ( 7a), through the inlet passage (6) and the stop valve (9) in this order, flows into the gas cylinder (1) and is filled.
Although the gas outlet (7b) has a high pressure with fresh gas, the communication passage (30) is sealed, and fresh gas does not flow into the working chamber (29), so the secondary safety valve (23) It does not open at the high pressure of fresh gas.
[0031]
In the first embodiment, the sealed portion (43) is configured by an outwardly expanding conical surface formed on the gas outlet (7b) side end surface of the decompression member (17). You may comprise by the cyclic | annular convex part formed in the opening periphery, and you may form in the inside of a pressure reduction member (17).
That is, for example, in the second embodiment shown in FIG. 3, a recess (48) having a diameter slightly larger than that of the sealing device (41) is provided on the end surface on the gas outlet (7b) side of the decompression member (17). A communication passage (30) that connects the gas outlet (7b) and the working chamber (29) is formed at the back of the recess (48). A conical surface extending toward the gas outlet (7b) is formed on the end surface of the peripheral wall (30a) of the communication passage (30), and the sealed portion (43) is configured by the conical surface. When the filling metal fitting (33) is attached to the outlet nozzle (12), the protrusion (40) of the pressing member (37) supported by the filling nozzle (34) is inserted into the outlet passage (8). A sealing tool (41) attached to the tip of the protrusion (40) is inserted into the recess (48), and a seal part (44) formed on the shoulder on the tip side of the sealing tool (41) is provided. The contacted portion (43) is contacted, and thereby the communication path (30) is sealed.
[0032]
In the second embodiment, the protrusion (40) is formed in a cylindrical shape, a fresh gas flow passage (42) is formed inside the protrusion (40), and a gas discharge port ( 47) is formed. The filling channel (35) in the filling nozzle (34) is communicated with the gas outlet (7b) through the flow passage (42) and the gas discharge port (47). Since other configurations are the same as those of the first embodiment, description thereof will be omitted.
[0033]
【The invention's effect】
Since the present invention is configured and operates as described above, the following effects can be obtained.
(1) Since the sealed portion is provided on the end face of the peripheral wall of the communication passage so as to face the gas outlet, the sealing member of the filling nozzle is only brought into contact with the sealed portion from the gas outlet toward the working chamber. Thus, the communication path can be sealed, so that fresh gas can be supplied from the gas outlet of the pressure reducing valve to the gas inlet without closing the pressure reducing member. Therefore, it is not necessary to provide the movable member required in the prior art, the pressure reducing valve can be made simple, and the space for accommodating the movable member can be omitted to make the pressure reducing valve compact.
[0034]
(2) In addition, the sealed portion provided on the end face of the peripheral wall of the communication path faces the gas outlet, and the sealing tool is sealed to the sealed portion from the gas outlet toward the working chamber. Since it is possible to seal the communication passage so as to cover it alone, it is possible to easily reduce the size of the sealing member provided in the filling nozzle. The pressure reducing valve can be configured compactly.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a pressure reducing valve provided in a valve device, showing a first embodiment of the present invention.
FIG. 2 is a cross-sectional view of a pressure reducing valve in a state where a filling fitting is attached.
FIG. 3 is a view corresponding to FIG. 2, showing a second embodiment of the present invention.
[Explanation of symbols]
7 ... Pressure reducing valve, 7a ... Gas inlet, 7b ... Gas outlet, 17 ... Pressure reducing member, 18 ... Pressure reducing valve seat, 29 ... Working chamber, 30 ... Communication passage, 30a ... Perimeter wall of communication passage, 34 ... Filling nozzle, 35 ... Filling path 37 ... Pressing member 38 ... Biasing means (biasing spring) 40 ... Projection part 41 ... Sealing tool 43 ... Seal part 45 ... Nozzle tip part 46 ... Gas discharge port 47 ... Gas outlet.

Claims (3)

A gas inlet (7a) and a gas outlet (7b) are opened in a pressure reducing valve chamber (14) formed in the housing ( 3 ) , and a pressure reducing valve seat (18) is formed around the gas outlet (7b) .
With the pressure reducing member (17) inserted into the pressure reducing valve chamber (14) interposed therebetween, a working chamber (29) is formed on the side opposite to the gas inlet (7a) ,
A first piston (26) for receiving the pressure of the gas inlet (7a) and a second piston (27) having a larger diameter and receiving the pressure of the working chamber (29) are formed in the pressure reducing member (17). ,
A communication path (30) is provided in the pressure reducing member (17) , and the working chamber (29) communicates with the gas outlet (7b) through the communication path (30) .
At the time of gas extraction, the pressure reducing member (17) is separated from the pressure reducing valve seat (18) by the pressure of the gas inlet (7a), and the pressure reducing member (17) is reduced by the pressure of the working chamber (29). ), And when filling the gas, the fresh gas from the filling nozzle (34) having the sealing tool (41) is transferred in the reverse direction from the gas outlet (7b) to the gas inlet (7a). A pressure reducing valve configured to supply,
The end face facing the said gas outlet (7b) of the circumferential wall (30a) of said communication passage (30), the sealed portion capable of blocking the communication between the working chamber above the gas outlet (7b) (43) setting only, when the above filling nozzle (34) is mounted, toward this sealed portion (43) above the sealing member (41) from the gas outlet (7b) above the working chamber (29) The pressure reducing valve is configured to prevent the fresh gas from flowing into the working chamber (29) by sealing contact. The elastic means (19) is inserted into the working chamber (29), and the pressure reducing member (17) is pressed toward the pressure reducing valve seat (18) by the elastic means (19). The pressure reducing valve according to 1. A cylindrical filter (15) was mounted between the gas inlet (7a) and the gas outlet (7b) in the outer peripheral space of the pressure reducing member (17) and the pressure reducing valve seat (18). The pressure reducing valve according to claim 1 or 2.

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