JPS585155Y2 - Overflow prevention valve - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a so-called overflow prevention valve that is built into a gas cock or the like and automatically shuts off a gas flow path when a downstream gas circuit becomes abnormally overflowed.

-゛The conventional overflow prevention valve is a straight type as shown in Fig. 1, and its operating state is such that the valve seat opening 1' is located upward and the opening end 3 of the cylindrical portion 2 below it is directed downward. In the reverse mounting position, the body valve fits into the valve seat port 1 in the initial state, and in the horizontal mounting position, there is no head difference between the valve seat port 1 and the body valve, and the body valve is in the initial or steady state. This causes the inconvenience of the body valve fitting into the valve seat opening.

As a solution to this inconvenience, Utility Model Application No. 53-722
There is a type such as No. 28 (Fig. 5) in which a curved cylindrical body housing a body valve is rotatably provided on the upstream side of the valve seat opening.

In this device, since the cylindrical body is rotatable around the axis of the valve seat opening, the cylindrical body is always located below the valve seat opening even if the mounting position of the overflow prevention valve changes. This eliminates restrictions on the mounting position of the overflow prevention valve.

However, this product sometimes does not exhibit the desired performance after being installed.

This is because the cylindrical body rotates, so when the gas cock is installed, the open end of the cylindrical body is fixed above the valve seat opening due to the friction of the rotating sliding part of the cylindrical body. This is because there are cases.

The present invention allows gas to flow from both the upper and lower sides of the valve seat opening to the valve seat opening, so that the mounting position of the overflow prevention valve can be maintained without changing the relative position between the valve seat opening and the body valve accommodating portion. The technical challenge is to make it possible to flip it upside down.

□Technical means to solve the above problem is to freely house the body valve in a cylinder whose upper and lower ends are open, provide a valve seat opening laterally in the middle of the cylinder, and install the valve seat opening into the cylinder. It is made to protrude outward from the internal wall of the body.

According to the above-mentioned technical means of the present invention, the body valve is held at the lower open end of the cylinder regardless of the vertical relationship of the cylinder, and the upper open part and the body valve are connected to the valve seat opening. Gas flows in from the outer peripheral gap of the valve, and when an overflow condition occurs, the body valve fits into the valve seat opening.

Therefore, the tail can be used with the overflow prevention device in place, and in the case of a gas cock incorporating this overflow prevention valve, the mounting orientation can be changed so that the direction of the gas inlet faces upward or downward.

The present invention has the following unique effects.

The overflow prevention device disclosed in Japanese Patent Application Laid-open No. 54-36630, in which two overflow prevention valves are housed horizontally in a box body, can also achieve the above purpose, but this device has two valve seat openings. It is equipped with separate valves, etc., and only one of the overflow prevention valves can be operated depending on the mounting orientation of the box.

Therefore, when the overflow prevention valve is incorporated into a gas cock, it is necessary to provide a separate reset means for each overflow prevention valve, which complicates the structure.

In the present invention, there is only one valve seat opening, so there is no such inconvenience.

Furthermore, in the above-mentioned conventional type, the body valve of the lower overflow prevention valve' is only statically fitted into the valve seat opening, so the airtightness of this part is insufficient and gas leakage increases when the flow path is shut off. However, the present invention can eliminate such inconvenience.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, details of embodiments of the present invention will be explained with reference to the drawings starting from FIG.

The overflow prevention valve A of the embodiment included in FIGS. 2 and 3 is as follows:
It has a straight cylindrical body inside, and the valve seat port 1 having a tapered inner surface that expands toward the upstream side is located on the downstream side, and the upstream side of the tapered part The cylindrical portions 4 and 5 are constructed such that a melt 8.9 is installed in the diametrical direction at the tip openings 6 and 7, and a suitably sized synthetic resin material is installed in the linear flow path. A heavy body valve 10 is accommodated.

Similarly, the valve seat port 1 is set to have a slightly smaller diameter than the body valve, and the cylindrical portions 4 and 5 are perpendicular to the axis of the valve seat port 1.

The above-mentioned overflow prevention valve A is housed in a cavity 12 which is provided next to and coaxially with the gas port 11, and an appropriate gap is formed between the inner wall of the cavity and the outer periphery of the cylindrical parts 4 and 5. , the valve seat opening 1 opens into an intermediate flow path 14 that serves as a communication path between the kiln chamber and the plug 13 , and the empty chamber 12 and the intermediate flow path are connected to the valve seat opening 1 and the cylindrical portion 4 ,
It communicates only through 5.

In addition, a passage hole 15 is suitably bored in the plug 13, and when the plug is rotated, the passage hole is cut off and the gas circuit force to the plug 16 is reversely closed.

Further, a locking shaft of an arcuate piece 17 that is swingably supported is paired at the lower end of the plug 13, and when the plug 130 rotates, it swings so as to come into contact with the valve seat port 1, and the plug 13 is fully closed. In this position, the arcuate piece is located near the center of the valve seat opening 1.

In the gas cock of the embodiment shown in FIG. 1, the cylindrical parts 4 and 5 of the overflow prevention valve A are installed in the empty chamber 12 with the gas port 11 facing downward. When attached, the body valve 10 is held in a free state near the open end within the one cylindrical portion 5.

When the gas cock is in use in the above-mentioned state, if an abnormal overflow condition occurs on the downstream side below the plug 16, the gas flow to the valve seat port 1 increases rapidly.

However, the passage resistance of the gap around the outer circumference of the ball valve 10 and the passage from the open end 6 of the other cylinder 4 to the valve seat port 1 is predetermined, and when the amount of gas passing over a certain amount is reached, After the body valve 10 is lifted and raised, it is fitted into the valve seat opening 1, and is thereafter maintained in the fitted state by gas pressure.

This shuts off the gas flow path inside the gas cock and automatically prevents future overflow conditions.

Thereafter, when the stopper 13 is returned to the fully closed position, the body valve 10 is pushed in by the action of the arcuate piece 17 and falls into the cylindrical portion 5, returning to its initial state.

Next, in the usage example shown in FIG. 3', the gas valve 11 is installed in an upwardly facing position.
0 is located at the lower end of one of the cylindrical portions 4, and functions in exactly the same way as in FIG.

Furthermore, in the embodiment shown in FIG.
, 5 are diagonally crossed with the opening line of valve seat opening 1.
1, that is, even if the cylinder and parts 4 and 5 are installed in the horizontal position (as shown in the figure), the body valve 10 is maintained in a free state at the open end of one of the cylinder parts due to the above-mentioned inclination. It operates in the same way as in the case of FIGS. 1 and 2.

[Brief explanation of drawings]

Fig. 1 and Fig. 5 are explanatory diagrams of the conventional example, Fig. 2 is a sectional view of a gas cock including the embodiment of the present invention, Fig. 3 is an explanatory diagram of another usage example, and Fig. 4 is an explanatory diagram of the other nine embodiments. It is a sectional view, and in the figure, 1... Valve seat opening, 4, 5... Cylindrical portion.

Claims (1)

[Scope of utility model registration request] In an overflow prevention valve that has a valve seat opening on the downstream side of the n-body valve accommodating part into which the front body valve can fit, the body valve is placed in a free state in the cylindrical body with both upper and lower ends open. An overflow prevention valve that is housed in a cylindrical body, has a valve seat opening facing sideways in the middle of the cylindrical body, and has the valve seat opening protruding outward from the inner wall of the cylindrical body.