JP2704389B2 - Pressure reducing valve for high pressure gas - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure reducing valve mainly used for city gas, and more particularly, to a pressure reducing valve of about 200.
The high-pressure city gas in kgf / cm ² to about several kgf / cm ² relates the high-pressure gas pressure reducing valve used to vacuum.

[0002]

^2. Description of the Related Art Conventionally, this type of high-pressure gas reducing valve has a low temperature of minus several tens of degrees due to adiabatic expansion of the high-pressure city gas in the process of reducing the high-pressure city gas to about several kgf / cm ^2. As a result, the entire pressure reducing valve freezes, which causes a problem that the pressure reducing valve stops functioning or is damaged.

In order to cope with this, in the conventional pressure reducing valve for high pressure gas, a separate heating means is provided to prevent icing of the pressure reducing valve, a driving portion of the pressure reducing valve,
For example, a diaphragm or spring for biasing a valve body is disposed at a position distant from the valve body, and a long power transmission mechanism such as a rod is disposed between the diaphragm or spring and the valve body. This prevents freezing of the drive part of the pressure reducing valve such as a spring or a spring.

[0004]

By the way, the conventional high pressure gas pressure reducing valve is provided with the heating means as described above,
Since the driving portion of the pressure reducing valve such as a diaphragm or a spring is disposed at a position distant from the valve body, the structure becomes complicated and the shape and weight become large, which makes it difficult to carry.

SUMMARY OF THE INVENTION The present invention solves the problems of the conventional high pressure gas pressure reducing valve, and has a simple structure, small shape and weight, and easy portability while having the function of preventing icing. The purpose is to provide a valve.

[0006]

In order to achieve the above object, a high pressure gas reducing valve according to the first aspect of the present invention comprises a valve body between a primary gas chamber connected to an inlet and a secondary gas chamber connected to an outlet. A valve seat is arranged, a piston and a dynamic bellows separate the gas chamber from the secondary side to form a pressure adjustment chamber, and a pressure adjustment chamber is provided with a spring that urges the valve body via an exhaust valve and a piston. The air inside the pressure reducing valve main body is replaced with gas by supplying a secondary gas to a cylinder chamber containing a piston and a dynamic bellows and a pressure adjusting chamber.

[0007] By supplying secondary gas to a cylinder chamber containing a piston and a dynamic bellows and a pressure adjusting chamber, air in the pressure reducing valve main body, which causes icing, is replaced by gas. It is possible to prevent freezing of a driving portion of the pressure reducing valve such as a dynamic bellows and a spring.

Further, the pressure reducing valve for high pressure gas of the second invention is
The high-pressure gas reducing valve according to the first aspect of the present invention is characterized in that an automatic shut-off valve that is operated by the pressure of the secondary gas and shuts off the supply of the primary gas is provided.

[0009] By providing an automatic shut-off valve for shutting off the supply of the primary gas, the supply of the primary gas is shut off when the pressure of the secondary gas rises abnormally, thereby preventing an accident or the like from occurring. Can be.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a high-pressure gas reducing valve according to the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a primary gas chamber 2 connected to an inlet 1 and an outlet 3 are provided at a lower portion of a pressure reducing valve main body 10 of a pressure reducing valve for high pressure gas (hereinafter simply referred to as “pressure reducing valve”). A continuous secondary gas chamber 4 is formed, and a valve element 5 is slidably disposed between the primary gas chamber 2 and the secondary gas chamber 4.
The valve seat 6 is fixed so as to face. The inlet 1 is connected to a primary gas supply pipe 21 extending from an automatic closing valve 30 described later.

A piston 7 is provided at an intermediate portion of the pressure reducing valve body 10.
And chamber 11 in which dynamic bellows 8 are arranged
To form The cylinder chamber 11 is divided into a cylinder upper chamber 11a and a cylinder lower chamber 11b via a piston 7, and the cylinder lower chamber 11b is defined and formed via the secondary gas chamber 4 and the control plate 7. At the same time, the secondary side gas chamber 4 communicates with a small hole 14a formed in the control plate 7, while the outside of the dynamic bellows 8 of the upper cylinder chamber 11a is formed by a small hole 7a formed in the cylinder lower chamber 11b and the piston 7. Communicate and configure. A secondary gas supply pipe 22 extending to a pressure adjusting device 60 described later is connected to the cylinder upper chamber 11a.

In the upper part of the pressure reducing valve main body 10, there is formed a pressure adjusting chamber 9a in which springs 18a and 18b for urging the escape valve 15 and the valve element 5 are arranged. The biasing force of the springs 18a, 18b is transmitted from the spring seat 16 to the valve body 5 via the sliding shaft 17, the piston 7, and the valve shaft 5a that form the spring seat 16. The pressure adjustment chamber 9a communicates with a pressure adjustment chamber 9b formed inside the dynamic bellows 8, and a secondary gas supply pipe 23 extending from a pressure adjustment device 60 described later is connected to the pressure adjustment chamber 9a. A pressure adjusting chamber 9b formed inside the dynamic bellows 8 from the pressure adjusting chamber 9a via a secondary gas supply pipe 23 extending from the pressure adjusting device 50.
Is transmitted from the piston 7 to the valve element 5 via the valve shaft 5a.

A small cylinder chamber 13 in which a small piston 12 is disposed is formed at the uppermost portion of the pressure reducing valve main body 10. The small cylinder chamber 13 has a primary gas supply pipe branched from a primary gas supply pipe 21. 24. Primary gas supply pipe 24
The pressure of the primary gas supplied to the small cylinder chamber 13 via the small piston 12 is transmitted from the small piston 12 to the valve body 5 via the sliding shaft 17, the piston 7 and the valve shaft 5a. Even if the pressure of the primary gas fluctuates, it is offset by the urging force of the small piston 12 that fluctuates according to the fluctuation of the pressure of the primary gas, and the fluctuation of the pressure of the secondary gas can be eliminated.

As shown in FIG. 2, an automatic shut-off valve 30, which is used for the pressure reducing valve and is operated by the pressure of the secondary gas to shut off the supply of the primary gas, has an inlet 31 to which the primary gas is supplied. And an outlet 32 connecting the primary gas supply pipe 21 extending to the pressure reducing valve. A valve body 33 is slidably disposed between the inlet 31 and the outlet 32, and faces the valve body 33. The valve seat 34 is provided as described above. On the upper part of the valve element 33, the valve element 3
A spring 35 for urging the piston 3 is provided.
6 is formed therein. The urging force of the spring 35 is transmitted from the spring seat 44 via the sliding shaft 43 to the valve element 33.
Is transmitted to A secondary gas supply pipe 25 branched from the secondary gas supply pipe 22 is connected to the cylinder chamber 37 via an automatic closing valve operating valve 40 and a check valve 45,
An escape valve 38 is disposed between the check valve 45 and the cylinder chamber 37. The pressure of the secondary gas supplied to the cylinder chamber 37 via the secondary gas supply pipe 25 extending from the automatic closing valve operating valve 40 is transmitted from the piston 36 to the valve element 33 via the sliding shaft 43. Is done. A small cylinder chamber 41 in which a small piston 39 is disposed is formed above the cylinder chamber 37. The small cylinder chamber 41 has an inlet 31 to which the primary gas is supplied.
Is connected to the primary gas supply passage 42 branched from the first gas supply passage 42. The pressure of the primary gas supplied to the small cylinder chamber 41 via the primary gas supply passage 42 is transmitted from the small piston 39 to the valve element 33 via the sliding shaft 43, and thus acts on the valve element 33. Even if the pressure of the primary gas fluctuates, the pressure is offset by the urging force of the small piston 39 that fluctuates in accordance with the fluctuation of the pressure of the primary gas, and the malfunction of the automatic shut-off valve 30 can be prevented.

As shown in FIG. 3, the pressure adjusting device 60 used in the pressure reducing valve for adjusting the pressure of the secondary gas is provided with a secondary gas supply pipe 22 extending from the cylinder upper chamber 11a of the pressure reducing valve. And the secondary gas supply pipe 23 extending to the pressure adjustment chamber 9a.
2. A handle 63 for operating the adjustment source valve 61 and the adjustment valve 62, an air release valve 64, and a pressure gauge 65 are provided.

Next, the operation of the pressure reducing valve will be described with reference to FIGS. The adjustment source valve 61 and the adjustment valve 62 of the pressure adjustment device 60 and the escape valve 38 of the automatic closing valve 30 are closed, and the escape valve 64 of the pressure adjustment device 60 and the escape valve 15 of the pressure reducing valve are opened. A stop valve (not shown) provided on the outlet 3 side of the pressure reducing valve is closed.

A high-pressure primary gas (for example, a city gas having a pressure of 200 kgf / cm ² ) is supplied to the inlet 31 of the automatic closing valve 30.
Supply. Thereby, the pressure of the secondary gas of the pressure reducing valve is slightly lower than the required pressure (for example, 7.7 kg).
f / cm ² ).

The control valve 61 of the pressure control device 60 is opened. As a result, the secondary gas introduced into the pressure regulator 60 from the cylinder upper chamber 11a of the pressure reducing valve via the secondary gas supply pipe 22 is discharged into the atmosphere from the exhaust valve 64 of the pressure regulator 60. You.

The control valve 62 of the pressure control device 60 is opened,
When the escape valve 64 of the pressure adjusting device 60 is closed, the secondary gas introduced into the pressure adjusting device 60 is introduced into the pressure adjusting chambers 9a and 9b via the secondary gas supply pipe 23. As a result, the air in the pressure adjustment chambers 9a and 9b is released into the atmosphere from the exhaust valve 15 of the pressure reducing valve, and is replaced with the secondary gas.

When the replacement of the pressure control chambers 9a and 9b is completed, the control valve 61 of the pressure control device 60 is throttled, and the amount of the secondary gas released into the atmosphere from the relief valve 15 of the pressure reducing valve is extremely reduced. Adjust so that it is very small.

The relief valve 15 of the pressure reducing valve is temporarily closed. As a result, the pressure of the secondary gas in the pressure adjustment chambers 9a and 9b rises, but this pressure becomes a required pressure (for example, 8.0 kgf).
/ Cm ² ), and then the adjustment source valve 61 and the adjustment valve 62 of the pressure adjustment device 60 and the relief valve 1 of the pressure reducing valve
5 is closed. Then, the escape valve 64 of the pressure adjusting device 60 is opened so that the pressure of the secondary gas does not abnormally increase.

By opening a stop valve (not shown) provided on the outlet 3 side of the pressure reducing valve, a required pressure (for example, 8.
A secondary gas reduced to 0 kgf / cm ² ) can be stably obtained.

Next, when the pressure of the secondary gas rises abnormally and exceeds the set pressure of the automatic closing valve operating valve 40, the secondary gas is discharged from the secondary gas supply pipe 22. The gas is introduced into the cylinder chamber 37 of the automatic shutoff valve 30 through the side gas supply pipe 25 and the automatic shutoff valve operating valve 40. This allows
The valve body 33 closes and shuts off the supply of the primary gas to the pressure reducing valve.

The return when the automatic closing valve 30 is operated is as follows.
For example, after opening the adjustment source valve 61 of the pressure adjustment device 60 and releasing the secondary gas into the atmosphere from the escape valve 64, the primary gas and the secondary gas are degassed.
The escape valve 38 of the automatic close valve 30 is opened, and the automatic close valve 30 is opened.
This is performed by opening the valve body 33 of FIG. Thereafter, the escape valve 3 of the automatic close valve 30 is operated so that the automatic close valve 30 operates.
8 is closed.

Thus, the operation returns to the initial state, and the same operation as above is repeated.

[0027]

According to the pressure reducing valve for high pressure gas according to the first aspect of the present invention, the secondary side gas is supplied to the cylinder chamber accommodating the piston and the dynamic bellows and the pressure regulating chamber, thereby reducing the pressure which causes icing. Since the air inside the valve body is replaced with gas, the pressure reducing valve for high pressure gas has a simple structure, and without increasing the shape and weight, the driving parts of the pressure reducing valve such as pistons, dynamic bellows, springs, etc. Freezing can be prevented.

According to the pressure reducing valve for high-pressure gas according to the second aspect of the present invention, by providing an automatic shut-off valve for shutting off the supply of the primary gas, the pressure of the secondary gas is abnormally increased. In addition, the supply of the primary gas can be shut off, accidents and the like can be prevented beforehand, and safety can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a pressure reducing valve for high pressure gas of the present invention.

FIG. 2 is a sectional view showing an automatic shut-off valve used for the high-pressure gas pressure reducing valve of the present invention.

3A and 3B show a pressure adjusting device used in the high-pressure gas pressure reducing valve of the present invention, wherein FIG. 3A is a front view, and FIG. 3B is a sectional view taken along line AA.

FIG. 4 is an explanatory diagram showing an operation state of the high-pressure gas pressure reducing valve of the present invention.

[Explanation of symbols]

 Reference Signs List 1 inlet 2 primary gas chamber 3 outlet 4 secondary gas chamber 5 valve body 6 valve seat 7 piston 8 dynamic bellows 9a pressure adjusting chamber 9b pressure adjusting chamber 10 pressure reducing valve body 11 cylinder chamber 12 small piston 13 small cylinder chamber 15 escape Pneumatic valve 18a spring 18b spring 30 automatic closing valve 40 operating valve for automatic closing valve 60 pressure regulator

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshio Mizukami 1-14-137 Nagasuhondori, Amagasaki City, Hyogo Prefecture Inside Toyo Seiki Co., Ltd. (72) Inventor Shinji Yoshikawa 1-14-137 Nagasuhondori, Amagasaki City, Hyogo Prefecture No. Toyo Seiki Co., Ltd. (56) References JP-A-6-59745 (JP, A)

Claims (2)

(57) [Claims] 1. A primary gas chamber (2) connected to an inlet (1).
A valve body (5) and a valve seat (6) are disposed between the secondary gas chamber (4) and the secondary gas chamber (4) connected to the outlet (3), and the secondary gas chamber is formed by a piston (7) and a dynamic bellows (8). A pressure adjusting chamber (9a, 9b) is formed separately from (4), and a spring for urging the valve element (5) to the pressure adjusting chamber (9a) via an air release valve (15) and a piston (7). (18a, 18b), a cylinder chamber (11) accommodating a piston (7) and a dynamic bellows (8), and a pressure adjusting chamber (9a, 9).
b) by supplying a secondary gas to the pressure reducing valve body (1).
0) A high-pressure gas pressure reducing valve characterized in that the air inside is replaced with gas. 2. The high-pressure gas reducing valve according to claim 1, further comprising an automatic shut-off valve which is operated by the pressure of the secondary gas and shuts off the supply of the primary gas.