JPS5848799B2 - A method for blocking and discharging air between a high-pressure gas cylinder and a pressure reducing valve, and the valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is designed to reduce the pressure of various gases filled in a high-pressure gas cylinder using a pressure-reducing valve to provide a desired use. The present invention relates to a method for blocking and discharging air that has been mixed in to prevent air containing moisture from being sent into the secondary side of the pressure reducing valve and the valve thereof.

Various high-pressure gases are compressed or liquefied and filled into cylinders at room temperature to a pressure of several to 150 atmospheres, and then the pressure is reduced to a desired pressure using a pressure-reducing valve and used for each purpose.

Normally, a pressure reducing valve is installed directly on a cylinder, or depending on the piping situation, a connecting pipe is interposed, or multiple cylinders are each connected to a connecting pipe, and these connecting pipes are collectively supplied to the main piping. using the device,
A pressure reducing valve is connected to the rear side of the cylinder so that a used cylinder can be switched to a filled cylinder.

In either case, when the gas in the cylinder is used up and replaced with a filled cylinder, the empty cylinder is removed and the filled cylinder is installed, but at this time, air such as outside air enters the primary side of the pressure reducing valve. It is undeniable that it will be put away.

If the next filled cylinder is loaded and high-pressure gas is supplied with air trapped in this state, the following problems will occur depending on the type of gas.

In other words, specially purified gases of the highest purity, high-precision standard gases used to standardize high-purity gas analysis instruments that are guaranteed to contain specific impurities below a certain level, and high-purity mixtures based on high-purity gases. Gases and the like may change in purity or concentration, and a state in which no measured value can be obtained during analysis work may continue for several days.

Diborane (B2H6),
Silane (S r H4) burns explosively with oxygen in the air.

In addition, corrosive gases such as chlorine and hydrogen chloride ammonia generate strong acid and strong alkaline aqueous solutions inside the pressure reducing valve due to moisture in the air, producing metal oxides and rapidly progressing corrosion.

In this way, various gases do not like air or moisture to be mixed in, but the conventional method to prevent this is, for example, by reducing the pressure of nitrogen or the like using a purge valve, which is called purging. Supply the pipes through valves and to the ends of various equipment, and discharge them to clean and remove air and moisture in the routes, or install a vacuum pump at the end of the pipes to create a vacuum in the system, and then install new Methods such as supplying the desired gas from a cylinder are adopted.

However, all of the above methods are time-consuming and troublesome, especially when the piping system is long, and in the case of purging, there is also the problem that the purge gas still remains in the system.

The present invention has been made in order to solve the problems of the prior art described above, and when using various gases filled in a high-pressure gas cylinder by reducing the pressure with a pressure reducing valve, the air that enters when replacing the cylinder is transferred to the secondary of the pressure reducing valve. It is an object of the present invention to provide a method and a valve thereof that can prevent the liquid from being sent to the side.

Examples will be described below with reference to the drawings.

In FIG. 1, 1 is a high-pressure gas cylinder filled with various gases, 2 is an air cutoff discharge valve according to the present invention, 3 is a pressure reducing valve, and 4 is a high-pressure gas cylinder filled with various gases.
5 is a joint, 5 is a pipe, and 6 is a device used depending on the type of gas, such as an analytical measuring device.

In this case, a connecting pipe may be used between the valve 2 and the pressure reducing valve 3.

In FIG. 2, each of the plurality of cylinders 1 is equipped with an air cut-off discharge valve 2, and these valves 2 are connected to each of the connecting pipes of the collecting device 9, which is formed by connecting a plurality of connecting pipes 7 to one main pipe 8. A pressure reducing valve 3 is attached to the outlet side of the main pipe 8, and is connected to, for example, a measuring instrument via a joint 4 and a pipe 5, as in FIG.

As shown in FIGS. 3 to 5, the air cutoff discharge valve 2 has a main body 10 formed with a valve chamber 11, an inlet 12, and an outlet 13, and a 3-port rotary valve body 14 disposed within the valve chamber 11. is connected and fixed to a switching lever 17 via a shaft 15 and a pin 16, and the switching lever 17 is rotatably attached to the main body 10 by a bracket 18.

A plug 19 and a joint 20 are attached to the inlet 12, and a screw 24 having a knob 22 and a poppet 23 is screwed into the plug 21 screwed into the lower part of the valve chamber 11, and the poppet 23 contacts or separates from the orifice 25. , furthermore, a discharge port 26 is formed.

A spring 27 is disposed between the plug 21 and the valve body 14, the outlet 26 communicates with an outlet 28 of the main body 10, and a hose joint 29 is attached to the outlet 28.

Next, the action will be explained.

When supplying gas from the cylinder 1 through the air cutoff discharge valve 2 and the pressure reducing valve 3, move the switching lever 17 of the valve 2 to the A position (
5), the inlet 12 and outlet 13 of the valve 2 communicate with each other via the valve body 14.

At this time, tighten the screw 24 with the knob 22 and remove the poppet 2.
3 is kept in contact with the orifice 25 to close it.

When replacing cylinder 1, move switching lever 17 of valve 2 to B.
In the position (FIG. 6), communication between the inlet 12 and the outlet 13 is cut off.

In this state, the empty cylinder 1 is removed and the filled cylinder 1 is installed on the inlet 12 side of the valve 2.

At this time, air containing moisture and other substances enters between the filling cylinder 1 and the valve 2, but when the cock of the filling cylinder 1 is opened and the screw 24 is slightly loosened using the knob 22 of the valve 2, the air is exhausted by high pressure gas. It is discharged into the outside air through the outlet 26, the discharge port 28, and the hose joint 29.

Therefore, the valve 2 of the present invention may be installed at an appropriate position between the cylinder 1 and the pressure reducing valve 2, but it is preferable to install it as close to the cylinder 1 side as possible, and optimally to attach it directly to the cylinder 1.

When using the collecting device 9 shown in FIG. 2, it is preferable to directly attach one to each cylinder 1.

When the valve 2 is directly attached to the cylinder 1, the air is completely exhausted by loosening and tightening the knob 22 two or three times, and the amount of gas consumed is extremely small.

After the air has been completely discharged, tighten the screw 24 firmly and move the switching lever 17 to position A, so that the inlet 12 and the outlet 13' communicate with each other, and the gas containing no air can be used for the desired purpose. Can be done.

Note that it is clear that it is within the scope of the technical idea of the present invention to provide the pressure reducing valve itself with the function of blocking and discharging air, which the air cutoff discharge valve has.

According to the above-described uninvented method of shutting off and discharging air between a high-pressure gas cylinder and a pressure reducing valve, and the valve, the high-pressure gas from a newly installed filled cylinder is used to replace air containing moisture and other substances that tend to enter when the cylinder is replaced. It can be easily shut off and discharged with an extremely simple operation, and various problems caused by air mixed in various gases can be solved at once, and also At this time, the amount of consumption of various gases is extremely small and is negligible and tolerable.

Furthermore, as a safety measure against hazardous gases, it is sufficient to connect a tube to the joint of the discharge port and discharge the gas to a safe location.

[Brief explanation of the drawing]

The figure shows an embodiment of the present invention, and FIG.
Figure 2 is a side view of the main parts when multiple cylinders are connected to one pressure reducing valve via a collection device, Figure 3 is an air cutoff discharge valve. FIG. 4 is a longitudinal sectional view of the same valve, FIG. 5 is a sectional view taken along the line V in FIG. 4, and FIG. 6 is a sectional view similar to FIG. be. 1... High-pressure gas cylinder, 2... Air cutoff discharge valve, 3... Pressure reducing valve, 9... Collection device, 10... Body , 12... Entrance,
13...Outlet, 14...3 port rotary valve body, 17...Switching lever, 22...
...Knob, 23...Poppet, 24...
... Screw, 25 ... Orifice, 26. 28
······Vent.

Claims (1)

[Claims] 1. Between a high-pressure gas cylinder and a pressure reducing valve, the cylinder and the pressure reducing valve can be freely communicated with and shut off, and when the cylinder is shut off, air or gas on the side of the cylinder from the shut off part is discharged to the outside air. A method of shutting off and discharging the air between a high-pressure gas cylinder and a pressure reducing valve. 2 Forming an inlet connected to the high-pressure gas cylinder, an outlet connected to the pressure reducing valve side, and a discharge port communicating with the outside air in the air cutoff discharge valve body, and communicating the inlet with either the outlet or the discharge port. An air cut-off discharge valve between a high-pressure gas cylinder and a pressure reducing valve, comprising a switching member and an opening/closing member at the discharge port.