JPH0327651Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Industrial application field) The extinguishing gas supply pipe of the fire extinguisher is equipped with a valve for each area to be extinguished, and in the event of a fire, only the valve in the area where the fire occurred is opened to supply extinguishing agent to that area. We are trying to extinguish the fire by radiating it. This invention relates to this valve, that is, the selection valve.

(Prior Art) Conventionally, this type of selection valve a has the head of valve b held down by a lever c, as shown in FIG.
, and the cam d serves as the axis of the lever e.
The lever e is connected to the piston f.

Lever c is always fixed by cam d so that valve b does not open. When a fire occurs, a signal gas is sent to the piston f. The pressure of this signal gas causes the piston f to rise, and the lever e rotates the cam d, so that the lever c is removed from the cam d, and the restriction on the valve b is released. When the fire extinguishing gas is sent to the primary port g, the pressure in the primary port g opens the valve b, and the fire extinguishing gas is radiated from the secondary port h to the fire site via the piping.

(Problems to be solved by the invention) The above-mentioned selection valve has a large valve device and cannot function satisfactorily unless the shaft positions of levers, cams, etc. However, many of them were not mass-produced.

This invention eliminates these drawbacks and provides a selection valve for a fire extinguishing system that is highly accurate and highly productive.

(Means for solving problems) This invention will be explained using a selection valve as an example.

That is, a piston 4 is provided in a main body 1 having an inlet 2 and an outlet 3 for extinguishing gas, and the piston 4 has a large diameter part 5 in the middle and small diameter parts 6 and 7 at both upper and lower ends, and the small diameter part 6 is formed in the main body. 1 protrudes outside, and the small diameter portion 7 fits into and separates from the inlet 2 to open and close the inlet 2 and the outlet 3,
A hollow part 9 is formed in the axis of the piston 4 and opens into the inlet 2, and the hollow part 9 communicates with the gap 20 between the small diameter part 6 and the large diameter part 5 through a side port 10, and is separately connected to the main body 1. A signal port 12 is provided to communicate between the large diameter portion 5 and the small diameter portion 7, and this signal port 1
2 communicates with the gap 20 through a communication port 11, and the communication port 11 is provided with a manual valve 13 that always closes the communication port 11. Reference numeral 8 denotes an opening of the hollow portion 9, which opens into the inlet 2. 14,15,16,1
7 and 18 are O-rings (packskins). 19
is a closing spring for the piston 4.

(Function) When signal pressure gas comes to the signal port 12 in this selection valve 1, this gas is transferred to the large diameter portion 5 of the piston 4.
and the small diameter portion 7. The gas pressure acts as a force against the difference in area between the large diameter part 5 and the small diameter part 7, and moves the piston 4 in the direction of the arrow.
The fire extinguishing gas is released from the fire and the valve is opened, after which the fire extinguishing gas sent to the primary port 2 is sent from the secondary port 3 to the area to be extinguished and radiated.

The pressure gas sent to the signal port 12 also goes to the manual valve, but since this valve does not open unless operated, it does not go to the piston 4.

Even if there is a selection valve to which signal gas is not sent in the event of a fire, extinguishing gas is sent to the primary port 2 to the selection valve connected to the same pipe. This fire extinguishing gas is also a pressure gas. However, signal exit 12
Since the signal gas is not coming to the piston 4, the piston 4 does not move (the state shown in Fig. 2 is maintained). That is, the pressure gas that has entered the hollow part 9 of the piston 4 is
Through the gap 20 between the large diameter part 5 and the small diameter part 6
The gas pressure acts on the large diameter section 5 and the small diameter section 6. The upper end of the small diameter portion 6 of the piston 4 is exposed to the atmosphere, and the lower end of the large diameter portion 5 of the piston 4 is also exposed to the signal port 12.
The atmosphere is at atmospheric pressure. Therefore, the force acting on the area difference between the two diameters presses the piston 4 in the direction of closing the valve. Further, the spring 19 has an auxiliary function for closing the valve.

In this case, the gas pressure entering the gap 20 causes the manual valve 1 to
3 is structured so that it cannot be opened, but if necessary, operate the manual valve 13 to open this valve. As the pressure gas enters the signal port 12 as described above, the piston 4 moves, the valve opens, and extinguishing gas is sent to the area.

(Effects of the invention) As described above, since this invention has a structure in which only one piston is provided in the valve, a selection valve with high precision and high productivity can be obtained with a small number of parts and machining by lathe cutting.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional selection valve, and FIG. 2 is a sectional view showing an embodiment of the selection valve according to the present invention. 1...Body, 2...Inlet, 3...Exit, 4...
Piston, 5... Large diameter part, 6, 7... Small diameter part, 9
...Hollow part, 12...Signal port, 13...Manual valve.

Claims (1)

[Scope of utility model registration request] Body 1 having an inlet 2 and an outlet 3 for fire extinguishing gas
, a piston 4 is provided, the piston 4 has a large diameter part 5 in the middle and small diameter parts 6 and 7 at both upper and lower ends, the upper end of the small diameter part 6 protrudes outside the main body 1, and the small diameter part 7 is fitted into the inlet 2. The piston 4 has a hollow part 9 in its axial center that opens to the inlet 2, and the hollow part 9 is connected to the small diameter part 6 by a side port 10.
A signal port 12 is separately provided in the main body 1 to communicate between the large diameter portion 5 and the small diameter portion 7, and this signal port 12 is connected to the communication port 11. and communicates with the gap 20, the communication port 11
A selection valve of the fire extinguishing system is provided with a manual valve 13 that always closes the communication port 11.