JPS6041267B2 - Seismic isolation valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sensitive shutoff valve incorporating the functions of an overflow shutoff valve and a safety valve.

Embodiments of the present invention will now be described in detail with reference to FIGS. 1 and 2.

Fig. 1 is a diagram showing an outline of a piping system in which the sensitivity cutoff valve and sensor of the present invention are incorporated, where 1 is an LP gas cylinder, 2 is a pipe, 3 is a pressure regulator, and 4 is a pipe 2 that is kept horizontally. 5 is a gas meter; 6 is a sensor installed horizontally on the wall of a building, etc.; this sensor 6 is activated by vibrations such as an earthquake, and The valve in the seismic isolation valve 4 is then closed.

8 indicates a combustor.

FIG. 2 is a cross-sectional view showing the details of the sensitive shutoff valve 4, where 9 is the valve body, the entrance of the valve body is 11, and 11 is the inside of the cylindrical valve pupil 12 formed inside the valve body 9. This is a ball valve that moves up and down, and a certain gap G is provided between the valve bamboo 12 and the ball valve 11.

Reference numeral 13 indicates a Sekiguchi hole bored approximately in the middle of the valve crab 12;
15 is a ring-shaped valve seat that is in close contact with the ball valve 11, and 15 is a valve seat on which the ball valve 11 is normally stationary.

Further, the valve seat 14 and the ball valve 11 are configured to have a slight gap even when they are in close contact with each other, so that gas flow is ensured within a flow rate of 5.5 so/h (allowed by the specified value). A diaphragm 16 is attached to a diaphragm receiving plate 17 and moves up and down by gas pressure. A spring 18 is installed between a spring support 19 and the diaphragm receiving plate 17 and applies a downward elastic force to the diaphragm 16.

20 is a valve body attached to the lower surface of the diaphragm 16;
21 is a valve seat that comes into close contact with the valve body 20 and blocks the gas flow path;
22 is a connecting rod, and a return handle 23 is fixed to the upper end of the connecting rod with a screw or the like.

Reference numeral 24 denotes a cap made of transparent synthetic resin or the like and is iron-mounted on the head of the valve body 9.

25 is a diaphragm chamber surrounded by a diaphragm 16, a valve body 20 and a valve seat 21; 26 is a flexible cable whose other end is connected to the eel sensor 6;
A terminal portion 27 for pushing up 1 is attached.

This terminal portion 27 is normally in the position shown in the figure, and when the sensor 6 is activated due to the occurrence of an earthquake, the flexible cable 2
6 to push up the ball valve 11 and the valve seat 14'. Next, the operation of the sensor shutoff valve of the present invention constructed as described above will be explained.

First, in normal times, since the screen sensor 6 is not operating, the terminal portion 27 of the flexible cable 26 is in the vertical position shown in the figure. Therefore, the ball valve 11 rests on the valve seat 15 due to its own weight, and the valve element 20 and valve seat 21 of the diaphragm 16 are separated, so that gas from the gas supply source such as the gas cylinder 1 can flow through the inlet 10, opening 13, It is supplied to the combustor 8 on the receiving side through the diaphragm chamber 25 and the outlet 28. Now, when an earthquake occurs and the sensor 6 operates, the terminal part 27 pushes up the ball valve 11 stationary on the valve seat 15 along the inner wall of the valve groove 12 via the flexible cable 26, and pushes the valve seat 1 up.
4 to hold it in close contact.

Therefore, depending on the closed state of the ball valve 11 and the valve seat 14,
Gas entering from the inlet 10 is blocked here and is not supplied to the receiving side. At this time, in a safe state where there is no leakage in the piping system or the end cock of the combustor is closed, the valve seat 21 and valve 20 will not close, so the sensor is reset after the earthquake subsides and the end of the flexible cable 26 is closed. When the pressure is lowered, the pressures before and after the ball valve 11 are equal, so the ball valve 11 falls under its own weight and the gas can be used. However, exit 28
If a gas leak occurs due to damage to the piping system, etc., or if the combustor or the like is left unused, the gas pressure in the diaphragm chamber 25 will drop rapidly, and the diaphragm 16 will Spring 1
The valve body 20 and the valve seat 21 are held in close contact with each other by being pushed down by the elastic force of the valve 8. Therefore, even if there is a gas leak in the piping system or the combustor is in use (valve open), the valve body 20, valve seat 21 and the ball valve 11
The gas flow is blocked more reliably by the double closing of the valve seat 14 and the valve seat 14. Next, the reset operation will be explained. First, after completing a safety inspection of the pipes, combustor, etc. and necessary restoration work, the sensor 6 is reset and the terminal portion 27 of the flexible cable 26 is pulled down.

However, temporarily, the upward gas pressure applied to the ball valve 11 is greater than the weight of the ball valve 11, so the ball valve 11
4 is maintained in a tightly closed state. However, since the ball valve 11 and the valve seat 14 have a slight flow,
As time passes and the space formed by the ball valve 11 and the valve body 20 is filled with gas pressure and the pressures before and after the ball valve 11 become equal, the ball valve automatically falls due to its own weight, and the ball valve 11 and the valve body Close contact with 14 will be canceled. As a result, the ball valve 11 descends due to its own weight and comes to rest on the valve receiver 15. Therefore, if the return handle 23 is pulled forward against the elastic force of the spring 18 and the diaphragm chamber 25 and the piping are filled with gas, the gas pressure applied to the pressure receiving surface of the diaphragm 16 will be reduced by the elastic force of the spring 18. Since the diaphragm 161 is pushed up by overcoming the pressure, the two valve bodies are opened and gas flow is resumed. As described above, the reset can be performed with a simple operation, but if the damaged part of the piping is not repaired or the combustor is still in use, if you try to reset it, the diaphragm chamber 25
Since the gas pressure does not return to the original specified pressure, when the return handle 23 is released, the valve body 20 and the valve seat 21 immediately return to the closed state, thereby avoiding danger due to erroneous operation.

Next, to explain its function as a gas safety valve, if the inlet pressure of the valve body and eventually the pressure inside the diaphragm chamber 25 suddenly decreases due to damage to the piping system on the purchase side, etc.
Since the diaphragm 16 is pushed down by the elastic force of the spring 18, the valve body 20 and the valve seat 21 are sealed, and gas flow is cut off.

(However, the ball valve 11 is stationary on the valve receiver 15.) In this way, it functions as a safety valve in the event of an unexpected accident. The reset operation can be performed by simply pulling up the return handle 23 in the same way as the operation in the event of an earthquake described above. Next, as an overflow shutoff valve, if an excessive amount of gas flows into the valve body 9 due to damage to the outlet side piping system or disconnection of the rubber hose, etc. during normal times, the sekiguchi 13, the inside of the valve crab 12 and the valve seat 14
The flow velocity in the vicinity increases and due to the Venturi effect, the ball valve 11
floats up and adsorbs to the square seat 14, blocking the gas flow.

At the same time, the valve body 20 and the square seat 21 are also closed due to a decrease in the gas pressure within the diaphragm chamber 25, so that the gas flow can be blocked more effectively. In this way, it functions as an overflow shutoff valve that closes when the flow rate of gas on the outlet side becomes excessive. In this case, the IJ set operation can be easily reset by performing the same operation as during an earthquake, but even if you reset without doing any recovery work, the valve must be immediately closed and reset for the same reason as mentioned above. I can't. As described above, according to the present invention, the three functions of a sensitivity valve, a safety valve, and an overflow shutoff valve can be achieved with one isolation valve, and the isolation valve and the sensitivity device are of a separate type connected by a flexible cable. The seismic sensor, which requires selection of the installation location in a building and accurate leveling work, and the shutoff valve, which is connected to a part of the piping system, can be installed separately, so the installation work is relatively simple. It has the advantage of being easy to do.

In addition, if damage occurs to piping due to pond farming, etc.,
The valve will not open even if you reset it without repairing it, so
This has the advantage of avoiding dangers such as gas leaks and fires due to incorrect operation. Moreover, it only functions as a shutoff valve to turn the valve on and off, and the pressure loss between the inlet and outlet is only the loss caused by passage resistance, and is extremely small, and the valve can only be driven by the force of a few grams to move the ball valve. There is also the advantage of having one.

As described above, the present invention provides a highly advantageous sensitive isolation valve.

[Brief explanation of drawings]

FIG. 1 is a schematic view showing a piping system in which the screen cut-off valve of the present invention is incorporated, and FIG. 2 is a sectional view showing an embodiment of the screen cut-off valve of the present invention. 4... Sensor shutoff valve, 6... Sensor sensor, 11.
... Ball valve, 14 ... Valve seat, 16 ...
Diaphragm, 20... Valve body, 21...
·valve seat. Tsuyoshi 1 figure porridge Z figure

Claims (1)

[Claims] 1. A cylindrical valve housing provided in the main body between an inlet connected to a gas supply source and an outlet connected to a gas receiving side and having an opening in the middle, and a valve seat formed in the upper part of the valve housing. and,
A ball valve that moves up and down with a gap sufficient for gas to pass through the valve casing and is in close contact with the valve seat with a gap sufficient for gas to flow within the allowable amount, and a ball valve placed downstream of the valve seat that controls the gas pressure. a diaphragm that moves up and down in response to vibrations; a valve that opens and closes as the diaphragm moves up and down; a seismic actuation member that is activated by a predetermined seismic intensity to push up the ball valve and hold it tightly against the valve seat; A seismic cutoff valve comprising a spring that applies opposing elastic forces and a reset means that opens the valve against the elastic force of the spring.