JPS6131235Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an automatic closing valve.
More specifically, if the gas is installed in a gas supply path that could cause an explosion or poisoning if it leaks, and the pressure on the primary side (supply side) is lost (such as when the supply is interrupted). This invention relates to an automatic closing valve that automatically closes a communication path between a primary side and a secondary side (demand side) to prevent accidents caused by gas leakage when supply is resumed.

For gases such as city gas and propane gas, which may cause explosions or poisoning if leaked, leakage must be prevented as much as possible to prevent accidents. In particular, when there are many customers for a single gas supplier (gas company), such as city gas supplied to each household, in an emergency such as when the gas supply is interrupted, all Sufficient care must be taken to prevent gas leaks within each household. This is because when the gas supply is restarted, gas leaking inside each home will cause a major accident, threatening the safety of each home.

Conventionally, when a situation such as the one described above occurs where the gas supply is temporarily interrupted, a specialist calls each household and confirms that all gas in each household has been shut off when the gas supply is resumed. Gas leakage was prevented by restarting the gas supply.

However, the above-mentioned countermeasures have disadvantages in that preliminary work before restarting the gas supply is difficult and it takes a long time to restart the gas supply. Furthermore, when an accident occurs in a part of the gas supply piping, the time required to close the main valve in the piping is delayed, leading to an aggravation of the accident.

This idea was devised in view of the above-mentioned problems of the prior art.It is installed in the gas supply passage, and when the pressure on the primary side (supply side) is lost, it automatically connects the primary side and secondary side. The problems in the prior art described above are solved by providing an automatic closing valve configured to close the communication path on the side (demand side). Hereinafter, one embodiment of this invention will be described in detail using the drawings.

In FIGS. 1 and 2, generally indicated by 1 is an automatic closing valve that can be freely inserted into a supply passage 2 for supplying city gas to each household, as shown in FIG. 3. It is structured as follows. That is, in the figure, 3 and 4 are a supply side port and a demand side port provided in connection parts 5 and 6 for freely connecting the automatic closing valve 1 to an appropriate part of the gas supply passage 2, and are in communication with each other. . Supply side port 3
The communication path 7 between the port 4 and the demand side port 4 is configured to be openable and closable via a valve body 9 movably supported by a valve case 8, and the valve body 9 is provided at an appropriate portion of the communication path 7. By being engaged and disengaged from the valve seat 10,
The communication path 7 can be opened and closed. A valve stem 11 in the valve body 9 is configured to protrude outward from an opening 12 provided at the upper part of the valve case 8, and a handle 13 for a reset operation is provided at the outer end thereof. ing. Note that 14 is a sealing member.

A piston 17 is integrally provided on the valve stem 11 and is slidable against an inner wall 16 of a cylinder chamber 15 provided in the valve case 8. The upper surface of the piston 17 and the upper surface of the cylinder chamber 15 There is a bullet 18 such as a compression coil spring between the
is loaded with ammunition. That is, the valve body 9 is the bullet 18
It is designed to be pressed and biased to close the communication passage 7 at all times. The biasing force of the bomb 18 is such that when the gas supplied from the supply port 3 is at a predetermined pressure, the pressure of the gas contracts the valve body 9 to open the valve, and the pressure inside the supply port 3 is It is set so that when gas pressure is lost, the valve body 9 can be opened by the accumulated force during contraction. Note that 19 is a buffer member made of rubber or the like. Reference numeral 20 denotes a groove for maintaining the valve body 9 in the closed state even when gas supply is resumed after the gas pressure on the supply side is lost and the valve body 9 is closed. As shown in , it is provided on the inner wall 16 of the cylinder chamber 15 so as to have a semicircular cross-sectional shape (other shapes may be used). Groove 20
is formed vertically in the same direction as the valve opening operation direction of the valve body 9, and when the valve body 9 is in the closed state, the inside of the supply side port 3 and the elastic machine side chamber (piston back side chamber) 2 are formed.
In addition to being configured to allow communication between
The length of the valve body 9 is set so that communication between the inside of the supply side port 3 and the inside of the piston back side chamber 21 via the piston 17 is closed when the valve body 9 is in the open state. In addition, 22 is a hole for discharging the gas in the piston back side chamber 21 to the outside when the valve body 9 is opened via the handle 13, and 23 is a safety cover.

The automatic closing valve 1 configured as described above has a third
As shown in the figure, the main valve 24 installed in each home
The structure is such that it can be freely inserted into an appropriate part of the communication path 2 that communicates the supply source side with the supply source side. Note that 25 is a gas meter, and 26 is a gas valve installed in each home.

If the automatic closing valve 1 with the above configuration is installed in the gas supply passage 2 to each home, even in an emergency, that is, when the gas supply is interrupted for some reason,
Since the automatic closing valve 1 is operated to close and cut off the gas supply path, it is possible to prevent gas leakage when the gas supply is restarted, which is safe. In particular, according to this invention, even when the gas supply is restarted, the pressure in the supply side port 3 and the inside of the piston back side chamber 21 become the same pressure due to the action of the groove 20, so that the valve is reliably closed. Therefore, gas leakage is reliably prevented when the gas supply is restarted.

When opening the automatically closed valve 1 in the closed state to resume gas supply, the consumer can grasp the handle 13, lift the valve stem 11, and hold the valve in that state for a while. In this way, the valve element 9 is reset to the open state by the gas pressure supplied from the supply side port 3, and the open state is maintained without closing even if the hand is released. And this valve open state is
The valve is reliably maintained as long as the gas supply is normal, and will not close unless the gas supply is interrupted. Furthermore, since the reset operation after the automatic closing valve 1 has been once closed cannot be performed unless gas is supplied, erroneous operation can be prevented. Note that during the reset operation, gas in the piston back side chamber 21 is discharged to the outside through the hole 22, but this is a very small amount and causes no problem.

In the above embodiment, the valve body 9 is configured to close when the gas pressure in the supply port 3 is lost, but when the gas pressure in the supply port 3 falls below a predetermined value. Of course, it is possible to construct the valve so that the valve can be closed. Moreover, if an elastic member such as rubber is attached to the valve body 9, a good gas insulating and cutting effect can be obtained.

As described above, this device is configured to automatically close the valve only when the gas pressure in the supply side port falls below a predetermined pressure, and to open the valve unless reset by external operation. This is a self-closing valve designed to prevent
With an extremely simple configuration, gas leakage can be prevented in an emergency, and the safety of each household can be ensured.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing the valve according to this invention in the open state, Fig. 2 is a side sectional view similarly showing the valve in the closed state, and Fig. 3 is a simplified diagram showing the arrangement of the valve according to this invention. , FIG. 4 is a view taken along the - line direction in FIG. 2. 2... Gas supply passage, 3... Supply side port, 4
... Demand side port, 7 ... Communication path, 8 ... Valve case, 9 ... Valve body, 11 ... Valve stem, 15 ... Cylinder chamber, 16 ... Inner wall, 17 ... Piston, 18
...Bombshell, 20...Groove, 21...Piston back side chamber.

Claims (1)

[Scope of utility model registration request] A valve body that can freely open and close a communication passage between the supply side port and the demand side port is provided in a valve case having a supply side port and a demand side port that can be freely connected to an appropriate part of the gas supply passage, and a valve body in the valve body is provided. The rod is provided with a piston that can freely slide into a cylinder chamber provided in the valve case, and the valve element is closed only when the gas pressure in the supply side port decreases to a predetermined value or less. A valve is press-biased and provided on the inner wall of the cylinder chamber through a bullet loaded with energy so as to be actuated, so that the inside of the supply side port and the piston rear side chamber are closed only when the valve body is in a closed state. An automatic closing valve characterized by having a groove for communication.