JPS6340700Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a valve used, for example, in a high-pressure gathering device for LP gas.

Conventionally, parallel cylinders containing high-pressure gas such as LP gas were connected to a high-pressure collection device using a hose, but if this hose were to break, the gas from each cylinder would leak out. As a result, disasters such as explosions occur.

In order to prevent this disaster from occurring, a valve shown in FIG. 1 has conventionally been connected between a high pressure collecting device and a cylinder connected thereto in parallel.

That is, in this valve, a main valve 4 provided at the lower end of an operating rod 3 is detachably attached to an annular main valve seat 7a provided in a valve body 1 having a gas inlet 1a and a gas outlet 1b by operating a handle 2. At the same time, the main valve 4 has a concave portion 4a provided with a check valve 5 having an elastic material 5a such as rubber attached to the lower surface of the main valve 4.
It is housed inside so that it can be raised and lowered freely. If the hose connected to the parallel valve is damaged and high-pressure gas flows backward from the gas exhaust port of the cylinder body to the gas inlet 1a, the check valve 5 in the main valve 4 will open due to the back pressure of this high-pressure gas. It is pressed against a small diameter check valve seat 7b provided concentrically with the main valve seat 7a to prevent backflow of high pressure gas.

However, in the conventional valve described above, the main valve 4 is provided with a concave portion 4a, and the check valve 5 is accommodated in the concave portion 4a so as to be able to move up and down. The shape of the disk 6 ₁ fitted to the lower surface of the main valve 4 has to be annular due to structural constraints. Since such an annular disk ₆₁ is locally pressed against the main valve seat 7a and is elastically deformed, it suffers severe mechanical fatigue and is easily worn, resulting in poor airtightness. Moreover, since the disk ₆₁ is easily detached from the main valve 4 due to mechanical fatigue, it is necessary to bond it with an adhesive, which increases the manufacturing cost.

The present invention was developed in view of the above points, and its purpose is to control fluid by a main valve and a floating valve as a check valve provided below the main valve. It is an object of the present invention to provide a valve with extremely high safety, such as a check valve that can reliably prevent backflow of high-pressure gas.

The present invention will be explained below with reference to an embodiment shown in FIGS. 2 to 4.

In this embodiment as well, the same parts as in FIG. 1 are designated by the same reference numerals.

Reference numeral 6 denotes a valve disk fitted to the lower surface of the main valve 4. The valve disk 6 is formed of an elastic material such as rubber and has a substantially circular shape and a size that extends substantially over the entire lower surface of the main valve 4. Reference numeral 7 designates a vent hole provided in the valve body 1. A main valve seat 7a is formed at the upper end of this vent hole 7, and a check hole 7 having a smaller diameter than the main valve seat 7a is formed at the lower end of this vent hole 7. Valve seat 7
b is formed. Reference numeral 8 denotes a non-return floating valve that is loosely fitted in the vent hole 7 so as to be able to rise and fall freely. It is formed by fitting an elastically deformable portion 10 made of an elastic material with a spacer 11 in between. Further, the elastically deformable portion 10 is projected downward from the cylindrical member 9 and can freely move toward and away from the check valve seat 7b. Reference numeral 12 denotes an O-ring attached to the outer periphery of the main valve 4 to maintain airtightness.

One embodiment of the present invention has the above-mentioned configuration, and by rotating the handle 2, the operating rod 3 is
The main valve 4 is opened and closed with respect to the main valve seat 7a via the
Fluid control can be performed by circulating or blocking high pressure gas.
That is, as shown in FIG.
When the high pressure gas is rising from the gas inlet 1a, it passes through the gap 13 between the inner wall of the vent hole 7 and the floating valve 8, and flows to the gas outlet 1b. At this time, the floating valve 8 is lifted up by the pressure of the high pressure gas on the circular valve disk 6 fitted on the lower surface of the main valve 4.
It is pressed.

Furthermore, when the main valve 4 is lowered and the valve disk 6 is pressed against the main valve seat 7a, the valve disk 6 is elastically deformed and the passage between it and the main valve seat 7a is closed, so that gas can be introduced. Gas flow into the port 1a is blocked (see FIG. 3). At this time, since the valve disk 6 is formed in a circular shape, unlike the conventional valve disk ₆₁ which is simply formed in a ring shape, the pressing force against the main valve seat 7a is dispersed, and the local mechanical Because there is little physical fatigue, there is less wear and durability. Moreover, since it is only fitted onto the lower surface of the main valve 4 and no adhesive is required, the adhesive work can be omitted and the cost can be reduced.

Furthermore, when the main valve 4 is pressed against the main valve seat 7a and fluid control is performed, the floating valve 8 has its upper surface pressed against the valve disk 6 on the lower surface of the main valve 4, and its lower surface has a vent hole. 7, the double closing action of the main valve 4 and the floating valve 8 causes
Controls the flow of high pressure gas without leaking.

If the hose connecting the cylinder and the high-pressure collecting device breaks during gas supply, the gas from the cylinder whose hose is not damaged will flow toward the damaged hose.

When high-pressure gas flows backward from the gas discharge port 1b, the floating valve 8 loosely fitted in the vent hole 7 is pushed down by the gas pressure, and the elastically deformable portion 10 is brought into close contact with the check valve seat 7b. This ensures that gas backflow is prevented.

As described above, in this device, a floating valve as a check valve is loosely fitted so as to be able to move up and down in an air hole having a main valve seat at the top to which a main valve operated by a handle can be attached and detached, and this floating valve is detachably attached to a check valve seat having a smaller diameter than the main valve seat. Therefore, if the hose connecting the cylinder and the high pressure collecting device is damaged, the floating valve will be naturally pressed against the check valve seat below the air hole by the gas pressure of the high pressure gas, thereby preventing backflow.
In addition, by simply operating the handle, the main valve can be easily pressed against the main valve seat, and the floating valve is pressed by the main valve and pressed against the check valve seat, resulting in a double valve closing action, allowing the control of fluids such as high-pressure gas to be performed safely and reliably without leaks.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an example of a conventional valve with a check valve, Fig. 2 is a sectional view showing an embodiment of the present invention with the main valve open, and Fig. 3 is a sectional view showing an example of the present invention with the main valve open. FIG. 4 is a cross-sectional view showing the valve in the closed state, and FIG. 4 is a cross-sectional view showing the backflow prevention state by the floating valve as a check valve. 1...Valve body, 2...Handle, 3...Operation rod, 4...Main valve, 6...Valve disk, 7...Vent hole, 7a...Main valve seat, 7b...Check valve seat, 8...Floating valve.

Claims (1)

[Scope of utility model registration request] A valve body having a gas inlet on one side and a gas outlet on the other side is provided with a vent hole having a main valve seat above and a check valve seat having a smaller diameter than the main valve seat below; A main valve that can be raised and lowered by operating a handle is removably attached to the main valve seat, and a floating valve as a check valve is loosely fitted in the vent hole below the main valve so that it can be raised and lowered. The floating
The valve is characterized in that when the main valve is closed, the upper and lower surfaces thereof are brought into pressure contact with the main valve and the check valve seat.