JPH0425148Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is used in a dry sprinkler system, which is an automatic fire extinguishing system, and detects the opening of the sprinkler head and the depressurization of the air piping when a fire occurs. The present invention relates to a valve device that opens a main valve of a sprinkler device.

(Prior art) In a dry sprinkler system, the water pipe is connected to the air pipe from the middle, and a flapper type check valve is installed between the water pipe and the air pipe to ensure that both pipes are completely connected at all times. is blocked by. In this flapper type valve, when the sprinkler head opens, the pressure in the air pipe is reduced, the flapper valve automatically opens, water flows into the air pipe, and the water is discharged from the head.

(Problem that the invention attempts to solve) When using a flapper type valve like this,
Since the air and water pressure in air and water piping is applied directly to the valve itself, the pressure value is limited and equipment design is difficult, and there are many problems such as the valve is also vulnerable to water hammer and difficult to completely seal. .

The inventor researched the use of commercially available valves in place of the flapper valves of such dry sprinkler systems, and as a result developed a sensing valve for use in this system.

(Means for Solving the Problems) This invention consists of a main valve 5 that always closes an air pipe 15 with a sprinkler head provided at the end of the pipe and a water pipe 16 having a water source at its source (see each figure).
and a piston device 6 is connected to the main valve 5 to open and close it, and is a sensing valve that senses a decrease in air pressure in the air pipe 15 and drives the piston device 6 to open the main valve 5. This sensing valve body 1
is separated into two left and right chambers AB, and is provided with a shaft 9 that passes through both chambers AB from side to side.The right end of the shaft 9 has a valve 3 for opening and closing the pressure fluid to the piston device 6, and the left end of the shaft 9 has a drainage valve. Valve 10 for opening and closing an outlet 18 connected to the
Further, a driving body such as a piston 2 or a diaphragm is disposed on the shaft 9 in the A chamber, and a connection port 4a and a connection port 11a to the air pipe 15 are provided in both the left and right chambers of the A chamber, respectively.

In the embodiment, the valve 3 has the valve 1 in the fitting part 3a.
0 are piston-type valves that fit into the fitting portions 10a, respectively. 9a is a fitting portion of the shaft 9.

An orifice 17 is installed between the drive chamber 7 and the connection port 4a on the left side of the A room, and a pipe 11 is installed on the right side of the A room.
connection ports 11a are provided respectively.

The valve chamber 8 has an inlet 12a connected to the pipe 12,
Also, on the outlet side of the valve 3, there is an outlet 1 connected to the pipe 13.
3a are provided respectively. 14 is a repulsion spring.

On the other hand, the sprinkler piping (see Figure 2) consists of an air piping 15 and a water piping 16.
5 and 16 are always closed by the main valve 5. The main valve 5 is a ball valve in this example. 5b is a valve, and a piston of a drive device 6 is connected to a rotating shaft 5a of this valve 5b.

The connection ports 4a and 11a of the sensing valve body 1 are connected to the piping 4,
11, each is connected to an air pipe 15. The piping 11 is provided with a check valve 11b midway to prevent backflow from the main body 1 to the air piping 15. In addition, the inlet 12a of the main body 1 is connected to the water pipe 16 via the pipe 12, and the outlet 13a is connected to the water pipe 16 via the pipe 12.
3 are respectively connected to the drive device 6.

19, 20, and 21 are normally open valves used for inspection and maintenance. The piping 22 is for alarm (the operation is omitted). 23 is a normally closed drain pipe valve used for inspection and maintenance.

(Function) In the device in which the sensing valve is connected to the sprinkler piping in this manner, in the A chamber of this sensing valve, the left and right chambers of the piston 2 are filled with pressurized air from the air piping 15. In addition, the water pipe 1 is located in the valve chamber 8 of the B chamber.
Contains 6 pressure water. In this embodiment, the fitting part 10a of the valve 10, the fitting part 9a of the shaft 9, and the fitting part 3a of the valve 3 all have the same diameter, and the fitting part 1
0a and the outlet side of the fitting part 3a are both at atmospheric pressure, so the pressure in the valve chamber 8 does not act on the valve 3, and the piston 2 is moved to the right by the spring 14 while the pressure in both the left and right chambers is equal. It stands still in the direction.

Therefore, this sensing valve is not affected in any way by the pressure of the pressure fluid acting on the valve chamber 8, and the valve 3 is opened by the pressure reduction in the drive chamber 7 of the piston 2 (see below).

In a dry sprinkler system connected to this sensing valve, if a fire occurs, a sprinkler head (not shown) provided at the end of the air pipe 15 opens, air leaks from the head, and air pressure drops rapidly. Then, the pressure in the chamber 7 of the sensing valve body 1 decreases through the pipe 4, and the piston 2 moves to the left. In this case, the pressure in the piping 16 also decreases, but the air pressure on the right side of the piston 2 does not escape to the piping 11 because there is a check valve 11b in the middle. And the valve 3 is the fitting part 3
a and opens, and the pressure water in pipe 12 is transferred to pipe 13.
goes to the drive device 6 and drives the piston to open the valve 5.
b is opened, whereby the pressurized water in the water pipe 16 flows into the air pipe 15 and is discharged from the opened sprinkler head.

After the main valve 5 opens, pressure water also enters the pipe 4. The pressure of this pressure water is throttled by the orifice 17, and since the valve 10 is open, it is drained from the outlet 18 to the drainage section.

(Other embodiments) The piston 2 of the main body 1 is replaced by a diaphragm. Its structure will be omitted.

(Effects of the invention) As mentioned above, this invention combines the sensing valve of this invention with the dry sprinkler piping that uses a commonly used ball valve as the main valve, thereby ensuring complete leak-free and malfunction-free operation. A device is obtained.

The sensing valve is separated into AB2 chambers, and the pressure in both chambers is not affected by each other. Therefore, the pressure can be set freely in the air piping and water piping, which makes not only the design of the device but also the inspection and maintenance easy.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the sensing valve of this invention, and FIG. 2 is a piping system diagram of a dry sprinkler system using this sensing valve. 1...Main body, 2...Piston (drive part), 3,
10... Valve.

Claims (1)

[Scope of utility model registration request] An air pipe 15 provided with a sprinkler head at the end of the pipe and a water pipe 16 having a water source are connected by a main valve 5 which is always closed, and a piston device 6 is connected to the main valve 5 to open and close the pipe. , is a sensing valve that senses a decrease in air pressure in the air pipe 15 and drives the piston device 6 to open the main valve 5, and the sensing valve main body 1 is separated into left and right chambers AB.
A shaft 9 passing through the piston device 6 from side to side is provided, and a valve 3 for opening and closing the pressure fluid to the piston device 6 is provided at the right end of the shaft 9.
A valve 10 is provided at the left end of the shaft 9 to open and close an outlet 18 connected to the drainage section, and a valve 10 is provided at the left end of the shaft 9.
A sensing valve for a dry sprinkler system in which a driving body consisting of a piston 2 or a diaphragm is arranged in a chamber, and a connection port 4a and a connection port 11a to an air pipe 15 are provided on both the left and right sides of a chamber A, respectively.