JPH03219172A - Cylinder valve with pressure reducing valve - Google Patents

Abstract

PURPOSE:To keep sealing function of a shutoff valve satisfactory as making time required for filling up gas short by obstructing outflow from a shutoff valve chamber to a gas outlet port at a time of taking out gas from a gas cylinder, and permitting inflow from the gas outlet port to the shutoff valve chamber at a time of charging gas. CONSTITUTION:Under a state that a shutoff valve body is open operated by an opening and closing operational device for shutoff valve, a check valve body 46 is close abutted on a check valve seat 45 by means of a resultant force of inner pressure of a gas cylinder and elastic pressure of a check spring 47, and gas outflow from a shutoff valve chamber 9 to a gas outlet port 15 via a bypass passage 40 is prevented at a time of taking out gas from the gas bomb. On the contrary,at a time of filling up gas to the gas cylinder, the check valve body 46 is separated from the check valve seat 45 in against a valve closing force of the check spring 47, by charged gas pressure of the gas outlet port 15, and gas inflow from the gas outlet port 15 to the shutoff valve chamber 9 via the bypass passage 40 is permitted.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a cylinder valve equipped with a pressure reducing valve, which is attached to a gas pump containing compressed gas, liquefied gas, etc. and used for taking out and filling gas. By doing so, when taking out gas, the high-pressure gas in the gas cylinder is taken out from the gas outlet hole in a reduced pressure state, and when filling gas, the gas cylinder can be filled with gas from the gas outlet hole. This technology shortens the time required for filling (and maintains a good sealing function as a shutoff valve).

(Assumed basic structure) This type of cylinder valve with pressure reducing valve has the following basic structure.

For example, as shown in FIG. 1 to FIG. 3 or FIG. The gas outlet hole 15 is connected to the gas outlet hole 15 via the chamber 13 in order, and the shutoff valve 8 connects the shutoff valve body 17 inserted into the shutoff valve chamber 9 to the shutoff valve opening/closing operation device 1.
The pressure reducing valve 12 is configured such that a pressure reducing valve body 26 inserted into the pressure reducing valve chamber 13 is opened and closed by a gas pressure actuator 27 and a pressure reducing valve seat 28 is operated. The gas pressure actuator 27 is pressed toward the valve opening side by the balance spring 36 and is also pressed toward the valve closing side by the gas pressure in the working chamber 31, and the pressure is reduced by the differential force between the balance spring 36 and the gas pressure. Valve body 26
is configured to be opened and closed by the pressure reducing valve seat 28, and the operating chamber 31 is configured to communicate with the gas outlet hole 15.

(Prior art) In the above basic structure, conventionally, Japanese Patent Application Laid-open No. 11827
There is one described in Publication No. 00.

As shown in FIG.
The shutoff valve body 17 and shutoff valve seat 19 are integrated with the pressure reducing valve chamber 13 of the pressure reducing valve 12, the pressure reducing valve body 26, and the pressure reducing valve seat 28, and the shutoff valve opening/closing operation device 18 By rotating the handle wheel 23, the male threaded valve rod 24 is moved forward and backward relative to the lifting nut 25.

That is, when the Honbe valve 1 is closed, the male threaded valve rod 24 is moved against the lifting nut 25 located at the top dead center, as shown in the figure.
is screwed toward the shutoff valve seat 19 side, and the shutoff valve body 17 is brought into closing contact with the shutoff valve seat 19. When the handle wheel 23 is rotated from this valve closed state to the loosened side, the male threaded valve rod 24 rises relative to the top dead center position 25, which is raised and lowered, and the male threaded valve rod 24 After reaching the top dead center and the closing valve body 17 is fully opened, the lifting nut 25 is lowered relative to the male threaded valve stem 24 to stop the receiver at the bottom dead center position, where the handle wheel 23 operation is stopped. As a result, even if gas pressure acts on the working chamber 31 during gas filling, the lifting nut 25 at the bottom dead center position prevents the male threaded valve rod 24 from descending, and the closing valve body 17 is separated from the closing valve seat 19. kept in condition.

When taking out gas from the gas pump, by positioning the lifting nut 25 in the area between the top dead center position and the bottom dead center position using the handle wheel 23, the elastic force of the balance spring 36 and the gas in the working chamber 31 are reduced. The differential force between the pressure and the gas pressure actuator 27 and the male threaded valve rod 24 opens and closes the one pressure reducing valve body 26 consisting of the closing valve body 17.

(Problem to be solved by the invention) Is the cylinder valve 1 of the above-mentioned prior art superior in that the pressure reducing valve body 26 can be kept fully open during gas filling, thereby shortening the gas filling time? There is.

That is, when taking out the reduced pressure gas, the pressure is adjusted in the narrow gap between the valve surface of the shutoff valve body 17 and the shutoff valve seat 19, so that the gas flows through the gap at an extremely high speed. Since the valve surface of the shutoff valve body 17 and the shutoff valve seat 19 of the shutoff valve 8 are gradually scraped away by the above-mentioned ultrahigh-speed flow, the sealing function is likely to be damaged early. Therefore, there is a risk of gas leakage during transportation to the gas pump or during storage.

This problem becomes a serious problem when the valve surface is made of an elastic member such as synthetic resin, as the damage progresses even faster.

An object of the present invention is to maintain a good sealing function of a shutoff valve while shortening the time required for gas filling.

(Means for Solving the Problems) In order to achieve the above object, the present invention is characterized by having the above basic structure configured as follows.

For example, as shown in FIGS. 1 to 3, a pressure-reducing valve chamber 13 is located in a portion of the periphery of the shut-off valve chamber 9 that is away from the shut-off valve opening/closing device 18 side and the gas outlet hole 15 side. A bypass passage 40 for the pressure reducing valve 12 is provided from the closing valve chamber 9 to the gas outlet hole 15 via the pressure reducing valve chamber 13, and a bypass check valve 41 is interposed in the bypass passage 40. The bypass check valve 41 is formed by pressing a check valve body 46 inserted into a check valve chamber 44 toward a check valve seat 45 with a check spring 47, and closed by a stop valve opening/closing operation device 18. When the valve body 17 is opened and operated, when taking out gas from the gas pump 4, the gas cylinder 4
The resultant force of the internal pressure of the check valve body 46 and the elastic force of the check spring 47
is brought into close contact with the check valve seat 45 to prevent gas from flowing from the stop valve chamber 9 to the gas outlet hole 15 via the bypass path 40. However, when filling the gas cylinder 4 with gas, the gas outlet hole At a filling gas pressure of 15, the check valve body 46 is separated from the check valve seat 45 against the valve closing force of the check c* (47), and the check valve body 46 is separated from the check valve seat 45 from the gas outlet hole 15 through the bypass path 40 to the closing valve chamber. This allows gas to flow into 9.

(effect) The invention works as follows.

During transportation or storage of the gas cylinder 4, the shutoff valve opening/closing operation device 18 brings the shutoff valve body 17 into close contact with the shutoff valve seat 19.

When removing gas, the shutoff valve body 17 is opened by the opening/closing operation device 18.
fully open. Then, the high pressure gas in the gas cylinder 4 becomes
The gas flows into the stop valve chamber 9 from the gas inlet hole 6, and the gas pressure causes the check valve body 46 of the bypass check valve 41 to come into close contact with the check valve seat 45, thereby preventing gas from flowing out from the bypass path 40. At the same time, the pressure reducing valve seat 28 and the pressure reducing valve chamber 13 are removed from the closing valve chamber 9.
The gas is taken out from the gas outlet hole 15 in a reduced pressure state.

On the other hand, when gas is filled, the shutoff valve body 1 is
7 is fully opened, filling gas is filled from the gas outlet hole 15. Then, the filling gas flows into the bypass passage 40 from the gas outlet hole 15, and the gas pressure causes the bypass valve 4 to open.
The gas flows into the check valve chamber 44 by pushing open the first check valve body 46, and from there passes through the stop valve chamber 9 and the gas inlet hole 6 in this order, and then fills the gas cylinder 4.

In this way, the filling gas does not have to bypass the pressure reducing valve 12 and pass through its narrow flow path, so the flow resistance is small and the time required for gas filling is short.

Moreover, since the shutoff valve 8 can be used in a fully open state when taking out gas or filling the gas, it is possible to prevent the valve face 17a and the shutoff valve seat 19 from being damaged by the flow of gas.

Therefore, the life of the sealing function of the shutoff valve 8 is extended, and gas leakage can be prevented for a long period of time during transportation or storage of the gas phone 4.

Note that in the above configuration, the pressure reducing valve chamber 13 of the pressure reducing valve 12
If a residual pressure holding check valve 50 is installed between the check valve chamber 44 of the bypass check valve 41 and the gas outlet hole 15, the check valve chamber 9 may be affected by backflow gas or atmosphere. This prevents the inside of the gas pump from being contaminated.

In addition, in the above configuration, when viewed with the Bonnhe valve l in the vertical orientation, the gas inlet hole 6 is opened in the lower surface of the valve box 2, and the gas outlet hole 15 is opened in the mid-height part of the valve box 2 in the horizontal direction. A closing valve chamber 9 is formed in the upper part of the valve box 2 in an upwardly opening shape, and a pressure reducing valve 12 is provided in a part different from the gas outlet hole 15 at a mid-height part of the valve box 2.
The pressure reducing valve chamber 13 and the working chamber 31 are formed side by side, and the check valve chamber 44 of the bypass check valve 41 is formed in the upper part of the pressure reducing valve chamber 13 at the lateral outer side of the stop valve chamber 9. When formed in the same direction as the hole 15, the entire Hombeharp can be compacted and easily placed in the protective cap of the gas pump 4.

(Effects of the Invention) The present invention has the following effects because it is constructed and operated as described above.

When filling a gas cylinder with gas, the filling gas is
Since there is no need to bypass the pressure reducing valve and pass through its narrow flow path, flow resistance can be reduced. Therefore, the time required for gas filling can be shortened, and the filling operation can be carried out efficiently.

Moreover, since the shutoff valve can be used in a fully open state when taking out gas or filling with gas, it is possible to prevent the valve surface and valve seat from being damaged by the flow of gas. As a result, the life of the sealing function of the shutoff valve is extended, and gas leakage can be prevented for a long period of time while the gas cylinder is being transported or stored.

(Example) An example of the present invention will be described below with reference to FIGS. 1 to 4.

As shown in the system diagram of FIG. 2, the cylinder valve 1 is connected to the gas outlet hole 6 of the valve box 2 through the stop valve 8, the pressure reducing valve 12, and the residual pressure holding check valve 50 in this order. 15 are connected. A bypass check valve 41 is disposed in a bypass passage 40 provided in parallel with the pressure reducing valve 12 . Furthermore, the primary side safety valve 64 is branched from between the gas inlet hole 6 and the stop valve 8, and the secondary side is branched from between the pressure reducing valve 12, the bypass check valve 41, and the residual pressure holding check valve 50. Safety valve 73 is branched.

To the gas phone 4, the old filling pressure (150 kg/cm'
) can be filled with high-pressure gas of 300 kg/cm', which is twice the amount of gas.

When taking out gas, by opening the shutoff valve 8, the high pressure gas in the gas phone 4 is reduced to a predetermined pressure by the pressure reducing valve 12, and then is taken out from the gas outlet hole 15 through the residual pressure holding valve 50.

When the residual pressure in the gas cylinder 4 drops to the set pressure as the gas continues to be removed, the residual pressure holding valve 50 or the check spring 60 (not shown here) automatically closes the residual pressure. This prevents further gas extraction, maintains the residual pressure in the gas cylinder 4 at the set pressure, and prevents the inside of the empty gas phone 4 from being contaminated by the intrusion of atmosphere.

In addition, when backflow gas enters the cylinder valve 1 through the gas outlet hole 15, the backflow is blocked by the residual pressure holding check valve 50, and the inside of the gas phone 4 is prevented from being contaminated by the backflow gas. do.

Furthermore, when filling the empty gas cylinder 4 with gas,
A gas filling fitting is connected to the gas outlet hole 15, and the residual pressure holding check valve 50 is forcibly opened manually or by filling gas pressure, and the shutoff valve 8 is opened. Then, the filling gas becomes
The gas is filled into the gas pump 4 from the gas inlet hole 6 through the gas outlet hole 15, the bypass check valve 41, and the stop valve 8.

The concrete structure of the cylinder valve 1 will be explained with reference to FIG. 3 and FIG. 1. FIG. 3 is a longitudinal sectional view, and FIG. 1 is a sectional view taken along the line I--I in FIG.

The cylinder valve 1 has a leg part 3 formed at the lower part of the valve box 2.
can be fixed to the gas cylinder by screwing to the neck 5 of 4. During transportation or storage of the gas cylinder 4, a protective cap (not shown) is attached to the threaded portion 5a on the outer periphery of the neck 5 to protect the gas cylinder valve 1.

A gas outlet hole 6 is opened in the lower surface of the leg part 3, and a gas outlet hole 15 is opened laterally in the mid-height part of the valve box 2. The shutoff valve chamber 9 is formed in an upwardly opening shape at the "-" side portion of the valve box 2 . The pressure reducing valve chamber 13 of the pressure reducing valve 12 is formed laterally in a portion around the closing valve chamber 9 that is different from the gas outlet hole 15. The check valve chamber 44 of the bypass check valve 41 is located on the lateral outer side of the closing valve chamber 9 and the pressure reducing valve chamber 13.
is formed in the upper part of the gas outlet hole 15 in the same direction as the gas outlet hole 15.

The gas inlet hole 6 is provided with a shutoff valve chamber 9, a communication passage 11, and a communication passage 11 of the shutoff valve 8.
The gas outlet hole 15 is communicated with the pressure reducing valve 12 via the pressure reducing valve chamber 13 and the gas outlet passage 14 in this order.

Further, a pressure reducing valve 12 is provided between the shutoff valve chamber 9 and the gas outlet path 14.
A bypass passage 40 is provided, and a check valve chamber 44 of a bypass check valve 41 is interposed in the bypass passage 40. moreover,
In a portion of the gas outlet path 14 closer to the gas outlet hole 15,
A residual pressure holding valve 50 is interposed.

The shutoff valve 8 is configured such that a shutoff valve body 17 is inserted into a shutoff valve chamber 9 so as to be vertically movable and can be opened and closed by a shutoff valve seat 19 using a shutoff valve opening/closing device 18 . That is, by rotating the valve stem 22 supported by the valve i21 with the handle wheel 23, the closing valve body 17 screwed into the closing valve chamber 9 is raised and lowered, thereby closing the synthetic resin valve surface 1.7a. The valve seat 19 is configured to be brought into closing contact with or separated from the valve seat 19.

The pressure reducing valve 12 is configured such that a pressure reducing valve body 26 inserted into a pressure reducing valve chamber 13 is opened and closed by a gas pressure actuator 27 on a pressure reducing valve seat 28 . That is, the piston-shaped gas pressure actuator 27 is hermetically inserted into the operating chamber 31 formed within the lid bolt 30 using the first sealing member 33 and the second sealing member 34 . The gas pressure actuator 27 is biased towards the left valve opening side by a balance spring 36 made up of a plurality of disc springs. The working chamber 31 is communicated with the gas outlet hole 15 via the gas pressure introduction path 37, the pressure reducing valve chamber 13, and the gas outlet path 14 in this order, and the gas pressure acting on both elbow stops 33 and 34 from the working chamber 31 is Gas pressure actuator 27 with a differential force of
is designed to be pushed toward the right valve closing side. and,
Due to the difference between the valve opening force of the balance spring 36 and the valve closing force of the gas pressure,
The valve face 26a of the pressure reducing valve body 26 is opened and closed relative to the pressure reducing valve seat 28.

The bypass check valve 41 is located inside the lid bolt 43,
A check valve chamber 44 and a check valve seat 45 are formed substantially coaxially with the gas outlet passage 14, and a check valve body 46 inserted into the check valve chamber 44 is pressed against the check valve seat by a check spring 47. We are cracking down on the 45th.

The residual pressure holding check valve 50 is configured as follows.

A cassette tube 5I consisting of a tube body 52 and a cap 53 is securely and removably screwed into the inner part of the gas outlet hole 15 via a sealing member 54. Case/throat tube 51
A check valve seat 56 and a check valve chamber 57 are formed inside. A cylindrical check valve body 58 is hermetically inserted into the check valve chamber 57 with a sealing member 59, and the check valve body 58 is inserted into the check valve seat 5 with a check spring 60.
6 will be suppressed. The check valve chamber 57 has a check valve body 58
It communicates with the gas outlet hole 15 via an outlet pressure introduction hole 61 inside.

The above cylinder valve 1 is used as follows.

When taking out gas from the gas cylinder 4, the shutoff valve body I7 is opened by the shutoff valve opening/closing device I8.

Then, the gas in the gas cylinder 4 flows through the gas inlet hole 6, gas inlet passage 7, shutoff valve chamber 9, and
After passing through the communication passage 11 in order, the pressure reducing valve body 26 is pushed open and the gas flows from the pressure reducing valve chamber 13 into the gas outlet passage 14, and the gas pressure reverses the check valve body 58 of the residual pressure holding check valve 5°. The gas is separated from the check valve seat 56 against the valve closing force of the stop spring 6o, and the gas flows out through the gas outlet hole 15. In this gas extraction state, the check valve body 46 of the bypass check valve 41 is brought into closing contact with the check valve seat 45 by the resultant force of the internal pressure of the gas cylinder 4 and the elastic force of the check spring 47, and is not closed. Gas outflow from the valve chamber 9 to the gas outlet hole 15 via the bypass path 40 is prevented.

When the gas extraction progresses and the residual pressure in the gas cylinder 4 drops to the set pressure, the closing force of the check spring 60 of the residual pressure holding check valve 50 is increased by the gas pressure in the gas outlet passage 14. The check valve body 58 is brought into closing contact with the check valve seat 56 by overcoming the valve force, and the residual pressure in the gas cylinder 4 is maintained at the set pressure.

Further, when backflow gas flows into the check valve seat 56 of the residual pressure holding check valve 50 from the gas outlet hole 15, the backflow gas pressure introduces outlet pressure in addition to the valve closing force of the check spring 60. Hole 6
1 into the check valve chamber 57 and acts as a valve closing force for the check valve body 58 to bring the check valve body 58 into closing contact with the check valve seat 56. This prevents the backflow gas from flowing back from the check valve seat 56 to the gas inlet hole 6 via the bypass passage 40 and the shutoff valve chamber 9.

Contrary to the above, when filling an empty gas cylinder 4 with gas, connect a gas filling fitting (not shown) to the gas outlet nozzle 15a on the peripheral wall of the gas outlet hole 15, and insert the cassette cylinder body 52. A gas filling valve opening tool inserted into the hole 52a (
(not shown) to forcibly open the check valve body 58 of the check valve 50 for residual pressure retention against the check spring 60, and in this state, the stop valve opening/closing operation device 18 is operated to open the check valve body 58. 17 and operate it.

Then, the filling gas becomes as shown in the dash-dot line diagram in the figure.
The gas flows from the gas outlet hole 15 through the check valve seat 56 of the residual pressure holding check valve body 50 into the gas outlet passage 14, and the gas pressure pushes open the check valve body 46 of the bypass check valve 41. The gas then flows into the check valve chamber 44, from where it passes through the stop valve chamber 9 and the gas inlet passage 7, and then flows into the gas pump 4 through the gas inlet hole 6. Note that during gas filling, the pressure reducing valve body 26 of the pressure reducing valve 12
is brought into contact with the pressure reducing valve seat 28 via the gas pressure actuator 27 with the gas pressure acting on the working chamber 31 .

The primary safety valve 64 is provided above the leg threaded portion 3, and has a safety operation chamber 66 communicated with a gas outlet hole 65 branched from the gas inlet passage 7.

It is hermetically fixed by a rupture plate 68 placed facing the gas outlet hole 65 or by a lid holder 67 screwed into the safety operating chamber 66. A fusible plug 70 is installed inside the lid holder 67.

Reference numeral 71 indicates a gas outlet.

Further, the secondary safety valve 73 described above is configured as follows.

That is, the safety operating chamber 75 is located in the upper part of the valve box 2 between the closing valve chamber 9 of the closing valve 8 and the operating chamber 31 of the pressure reducing valve 12.
The safety operating chamber 75 is formed diagonally upward, and is communicated with the gas outlet passage 14 via the gas outlet hole 74 . A rupture disc (safety actuator) placed facing the end of the gas outlet hole 74
77 is hermetically fixed with a lid bolt 76. Lid bolt 7
A back-up pressing tool 79 is screwed into 6 to stop the rupture disc 77 from being held during gas filling. A gas ejection hole 80 is formed in the backup press tool 79 .

FIG. 4 shows a modification, in which the secondary safety valve described above is configured as a spring type.

In the lid holder 85 attached to the valve box 2, a gas outlet hole 86, an on-off valve seat 87, and an on-off valve chamber 88 are formed in order from the bottom. An on-off valve body 89 is screwed into the on-off valve chamber 88 in a manner that allows the upper and lower passages to freely move and seal. A safety valve seat 9 is located inside the on-off valve body 89.
1. Safety operating chambers 92 are formed in order from the bottom. A safety valve body (safety actuator) 93 inserted into a safety actuation chamber 92 is brought into close contact with a safety valve seat 91 by a safety actuation spring 94.

This spring-type safety valve is convenient because, unlike the above-mentioned rupture disc type, the safety valve body 93 can be used repeatedly even after safe operation. Also, when filling with gas, the on-off valve body 8
The safety valve body 89 can be closed by simply bringing it into close contact with the opening/closing valve seat 87.
Safe operation can be prevented, so the operation is easy and reliable.

[Brief explanation of drawings]

1 to 4 show embodiments of the invention. Figures 1 to 3 show one example of this. Figure 1 is a sectional view taken along line II in Figure 3, Figure 2 is a system diagram of a cylinder valve, and Figure 3 is a cylinder valve system diagram. FIG. FIG. 4 is a partial diagram showing a modification. FIG. 5 shows a conventional example and is a diagram corresponding to FIG. 3. 1. Cylinder valve, 2. Valve box, 4. Gas horn bellow.
Gas population hole, 8... Closing valve, 9-... Closing valve chamber, 12...
Pressure reducing valve, 13・Pressure reducing valve chamber, 15...Gas outlet hole, 17
・Shutoff valve body, 18... Opening/closing operation device for shutoff valve, 19. Shutoff valve seat, 26 ・Pressure reducing valve body, 27... Gas pressure actuator,
28 ・Reducing valve seat, 31 ・Working chamber, 36 ・Balance spring, 40 ・No path path, 41 ・Check valve for bus, 44 ・Check valve chamber, 45 ・Check Ben skewer, 46・
・Check valve body, 47 ・Check spring, 50 ・Residual pressure retention check valve, 56 ・Check valve seat, 57 ・Check valve chamber, 6
0 Check spring, 73... Secondary safety valve, 74... Gas outlet hole, 75... Safety operation chamber, 77... Safety operation tool. Figure 5

Claims (1)

[Claims] 1. In the valve box (2) of the cylinder valve (1), the shut-off valve chamber (9) of the shut-off valve (8) and the pressure reducing valve (1) are connected to the gas inlet hole (6).
2) through the pressure reducing valve chamber (13) in order, and the gas outlet hole (
15), and the shutoff valve (8) is connected to the shutoff valve body (9) inserted into the shutoff valve chamber (9).
17) to the shutoff valve seat (1) using the shutoff valve opening/closing device (18).
9), the pressure reducing valve (12) is configured to be able to be opened and closed, and the pressure reducing valve (12) is configured such that the pressure reducing valve body (26) inserted into the pressure reducing valve chamber (13) is connected to the pressure reducing valve seat (28) using a gas pressure actuator (27).
The gas pressure actuator (27) is pressed toward the valve opening side by the balance spring (36) and is also pressed toward the valve closing side by the gas pressure in the operating chamber (31). , the pressure reducing valve body (26) is opened and closed by the pressure reducing valve seat (28) by the differential force between the balance spring (36) and the gas pressure, and the working chamber (31) is connected to the gas outlet hole (15).
), in a cylinder valve with a pressure reducing valve, from the part around the shutoff valve chamber (9) on the shutoff valve opening/closing device (18) side and the part on the gas outlet hole (15) side. A pressure reducing valve chamber (13) is formed in the part that comes off, and a bypass path for the pressure reducing valve (12) is formed between the closing valve chamber (9), the pressure reducing valve chamber (13), and the gas outlet hole (15). (40), a bypass check valve (41) is interposed in the bypass passage (40), and the bypass check valve (41) is
A check valve body (46) inserted into a check valve chamber (44) is pressed against a check valve seat (45) by a check spring (47),
When the shutoff valve body (17) is opened with the shutoff valve opening/closing device (18), when gas is taken out from the gas cylinder (4), the internal pressure of the gas cylinder (4) and the elastic force of the check spring (47) are combined. The check valve body (46) is brought into closing contact with the check valve seat (45) by the resultant force of On the other hand, when filling the gas cylinder (4) with gas, the gas outlet hole (1
separating the check valve body (46) from the check valve seat (45) against the valve closing force of the check spring (47) using the filling gas pressure in step 5);
A cylinder valve with a pressure reducing valve, characterized in that gas is allowed to flow from a gas outlet hole (15) through a bypass path (40) into a shutoff valve chamber (9). 2. From the pressure reducing valve chamber (13) of the pressure reducing valve (12) and the check valve chamber (44) of the bypass check valve (41) to the gas outlet hole (1
5), a residual pressure retention check valve (50) is inserted, and this residual pressure retention check valve (50) is a check valve inserted into the check valve chamber (57). When the body (58) is pressed against the check valve seat (56) by the check spring (60) and the shutoff valve opening/closing device (18) is operated to open the shutoff valve body (17), When the residual pressure in the gas cylinder (4) exceeds the set pressure, the residual pressure moves the check valve body (58) from the check valve seat (56) against the valve closing force of the check spring (60). When the residual pressure in the gas cylinder (4) drops to the set pressure, The valve-closing force of the check spring (60) overcomes the valve-opening force of the gas pressure, bringing the check valve body (58) into closing contact with the check valve seat (56), thereby eliminating the residual pressure in the gas cylinder (4). While maintaining the set pressure, when backflow gas flows into the check valve seat (56) from the gas outlet hole (15), the check spring (60)
In addition to the valve-closing force of
), the backflow gas is prevented from coming into contact with the check valve seat (
The cylinder valve with a pressure reducing valve according to claim 1, configured to prevent backflow from the gas inlet hole (6) through the bypass path (40) and the shutoff valve chamber (9). 3. When looking at the cylinder valve (1) vertically, open a gas inlet hole (6) on the bottom of the valve box (2), and a gas outlet hole at the mid-height part of the valve box (2). (15) is opened sideways, and a closing valve chamber (9) is placed in the upper part of the valve box (2).
The pressure reducing valve chamber (13) and the working chamber (31) of the pressure reducing valve (12) are formed in an upward opening shape, and the pressure reducing valve chamber (13) and the working chamber (31) of the pressure reducing valve (12) are formed at a mid-height part of the valve box (2) in a part different from the gas outlet hole (15). The check valve chamber (44) of the bypass check valve (41) is connected to the gas outlet hole (15) in the upper part of the pressure reducing valve chamber (13) on the lateral outside of the stop valve chamber (9). The cylinder valve with a pressure reducing valve according to claim 1 or 2, which is formed in the same direction as the cylinder valve.