JPH0419095Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an emergency shutoff valve that is installed on the inflow and outflow sides of a water storage tank to secure drinking water, fire extinguishing water, etc. in the event of an earthquake.

[Conventional technology]

In recent years, in order to secure drinking water, fire extinguishing water, etc. in the event of an earthquake in the water supply system, a water storage tank 5 is installed at the end of the water main branch 50, as shown in Fig. 7.
1 is now connected. Water is supplied to the water storage tank 51 through a water main 50.
This is done by fully closing the control valve 52 of the tank, and in order to prevent the amount of water from flowing out of the water storage tank 51 in the event that the water pipe 50 is damaged during an earthquake, the inflow pipe 53 and outflow pipe 54 to the water storage tank 51 are connected respectively. Emergency shutoff valves 55 and 56 are provided to shut off the pipeline and secure water in the water storage tank 51.

[Problem that the invention attempts to solve]

However, in order to secure water in the water storage tank, even if a break occurs in either the water main upstream or downstream of the water storage tank in the event of an earthquake, emergency shutoff valves must be installed on both the upstream and downstream sides. closing is necessary (upstream failure) and desirable (downstream failure). Due to its usage, conventional emergency shutoff valves were unlocked and closed only in the event of damage to the downstream pipeline (differential pressure sensing in one system) or an earthquake of a predetermined seismic intensity or higher. In order for both emergency shutoff valves to operate even if damage occurs on either the downstream side, as shown in Figure 8,
Four emergency shutoff valves must be installed.

This invention was devised in view of the above points, and by sensing the differential pressure of multiple systems with only two units installed in the inflow pipe and the outflow pipe, it is possible to detect the water mains on either the upstream or downstream side. To provide an emergency shutoff valve capable of securing water in a water storage tank by shutting off both pipes even if a pipe is damaged.

[Means for solving problems and their effects]

In order to solve the above problems, the present invention includes a valve device interposed in a conduit, a biasing device that rotationally biases the valve body of the valve device in the valve closing direction, and a biasing device that biases the valve body of the valve device in the valve closing direction. a lock device that locks the valve body in an open state against a force; a detection device that operates a differential pressure cylinder when the pressure difference in the pipe exceeds a predetermined setting value; In the emergency shutoff valve, the detection device is provided in the inflow pipe and the outflow pipe of the water storage tank, and the two differential pressure cylinders are connected in parallel or in series. The upstream pressure of the detection device is introduced into the secondary side of the differential pressure cylinder and the downstream pressure is introduced into the primary side of the differential pressure cylinder with respect to the inflow pipe, and the upstream pressure of the detection device is introduced into the outflow pipe. It is characterized by being configured so that pressure is introduced into the primary side and downstream pressure is introduced into the secondary side.

By adopting the above configuration, by simply installing two emergency shutoff valves of the present invention, both pipes can be shut off even if the water main on either the upstream or downstream side of the water storage tank is damaged. , it is possible to secure drinking water and firefighting water in the water storage tank.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a front view showing the overall configuration of an emergency shutoff valve according to a first embodiment of the present invention, FIG. 2 is a left side view of the same, and FIG. FIG. 4 is an explanatory diagram of a main part showing a second embodiment of the present invention, and FIGS. 5 and 6 are explanatory diagrams showing a lock release operation.

A first embodiment of the present invention will be described based on FIGS. 1 to 3. As shown in FIGS. 1 to 3, the emergency shutoff valves A and B installed in the inflow pipe 14 and outflow pipe 16 of the water storage tank T have the same structure, respectively, and have a valve body 1 and a valve stem 2 integrated with each other. A locking device 4 using multistage levers is attached to one end projecting through the valve body 3, thereby locking the valve body 1 at a required opening angle. and,
A weight 6 serving as a biasing device is attached to the opposite side of the lock device 4 via a weight lever 5, thereby constantly biasing the valve body 1 in the valve closing direction. The locking device 4 is connected to an unlocking device consisting of differential pressure cylinders 7 and 8, which will be described later, via an engaging means, and the piston rods 9 and 9 of the differential pressure cylinders 7 and 8 are connected to each other.
The upward movement of 10 disengages the locking device 4, releases the locked state of the valve shaft 2, and the weight of the weight 6 closes the valve body 1. The other end of the valve shaft 2 extends to a connection base 11, and a drive device 13 having a handle 12 for opening the valve body 1 and returning it to its original state after emergency shutoff is provided on the extension thereof.

Next, the lock release device and the detection device for sensing differential pressure, which are the main parts of the present invention, will be explained in detail.
The unlocking device 2 according to the first embodiment of the present invention consists of two differential pressure cylinders 7 and 8 installed in parallel.
The differential pressure cylinder 7 has an orifice 15 attached to the inflow pipe 14 of the water storage tank T, as shown in FIG.
The pressure P ₁ on the upstream side of the differential pressure cylinder 7 is introduced into the upper chamber 7a, which is the secondary side of the differential pressure cylinder 7, and the pressure P ₂ on the downstream side of the orifice 15 is introduced into the lower chamber 7b, which is the primary side of the differential pressure cylinder 7. It is configured as follows. Further, the differential pressure cylinder 8 is connected to the outflow pipe 1 of the water storage tank T.
Pressure on the upstream side of the orifice 17 attached to 6
P ₁ ' is the lower chamber 8b which is the primary side of the differential pressure cylinder 8.
The pressure R ₂ ' on the downstream side of the orifice 17 is introduced into the upper chamber 8a, which is the secondary side of the differential pressure cylinder 8. Differential pressure cylinder 7, 8
A piston is provided between the upper chambers 7a, 8a and the lower chambers 7b, 8b, and piston rods 9, 10 of the piston extend vertically through the differential pressure cylinders 7, 8, respectively. piston rod 9,
The lower end of 10 is connected to a holding lever 20 via elongated hole links 18, 18 and a pin 19. Then, the holding lever 20 is connected to the lever 2 of the locking device 4.
1 in a releasably engaged manner. The long hole links 18, 18 have long holes, and one end thereof is rotatably connected to the lower ends of the piston rods 9, 10 of the differential pressure cylinders 7, 8 by pins 22, 22. Due to the effect of the elongated holes of the elongated hole links 18, 18, the differential pressure cylinders 7, 8 can operate independently without being restricted by each other. On the other hand, the adjustment weight 2 is located above the piston rods 9 and 10.
3, 23 are provided, and these weights 23, 23
By adjusting , the differential pressure value at which the lock is released can be adjusted.

With this configuration, the pipe line on the upstream side of the water storage tank T will be damaged, and the pressure on the upstream side of the orifice 15 will be reduced.
P ₁ becomes small, and the downstream pressure of orifice 15 P ₂
When the pressure becomes large, the piston rod 9 of the differential pressure cylinder 7 moves upward against the force of the adjustment weight 23, so that the locking device 4 is moved upward as shown in FIGS.
The lever 21 and the holding lever 20 are disengaged and the emergency shutoff valve A is closed. At the same time, the emergency shutoff valve B on the outflow pipe 16 side is activated in the same manner, closing the valve and stopping the outflow from the water storage tank T to the downstream side.

In addition, the pipe line downstream of the water storage tank T was damaged.
When the pressure P ₂ ′ on the downstream side of the orifice 17 becomes small,
The upstream pressure P ₁ ' of the orifice 17 becomes large, and the piston rod 10 of the differential pressure cylinder 8 moves upward against the force of the adjustment weight 23, so that the lever of the locking device 4 and the holding lever 20 are disengaged. Emergency shutoff valve A closes the valve. At the same time, the emergency shutoff valve B on the outflow pipe 16 side is activated in the same manner, closing the valve and stopping the outflow from the water storage tank T to the downstream side.

Next, a second embodiment of the present invention will be explained based on FIG. 4. The lock release device according to the second embodiment of the present invention includes two differential pressure cylinders 24 installed in series,
As _shown in FIG. Introduced into 24a,
The pressure P ₂ on the downstream side of the orifice 15 is introduced into the lower chamber 24b, which is the primary side of the differential pressure cylinder 24. In addition, the differential pressure cylinder 25
The pressure P ₁ ' on the upstream side of the orifice 17 attached to the outflow pipe 16 of the water storage tank T is introduced into the lower chamber 25b which is the primary side of the differential pressure cylinder 25, and the pressure P ₂ ' on the downstream side of the orifice 17 is introduced. The differential pressure cylinder 2
5 is configured to be introduced into the upper chamber 25a which is the secondary side of 5. The differential pressure cylinders 24, 25 are each partitioned by two pistons provided on the same piston rod 26. This piston rod 26 is also similar to the piston rods 9 and 10 of the first embodiment.
Similarly, a holding lever 20 is connected to its lower end, and an adjustment weight 23 is attached to its upper end.

With this configuration, like the first embodiment,
If the pipe line on the upstream side of the water storage tank T is damaged, and the upstream pressure P ₁ of the orifice 15 becomes small and the downstream pressure P ₂ of the orifice 15 becomes large, the piston of the differential pressure cylinder 24 will move against the adjustment weight 23. Since it moves upward against the force, the entire piston rod 26 moves upward, disengaging from the locking device 4 and closing the emergency shutoff valve A. At the same time, emergency shutoff valve B on the outflow pipe 16 side
operates similarly to close the valve.

In addition, the pipe line downstream of the water storage tank T was damaged.
When the pressure P ₂ ′ on the downstream side of the orifice 17 becomes small,
The upstream pressure P ₁ ' of the orifice 17 becomes large, and the piston of the differential pressure cylinder 25 moves to the adjustment weight 23.
As it moves upward against the force, the entire piston rod 26 moves upward, disengaging from the locking device 4 and closing the emergency shutoff valve A. At the same time, the emergency shutoff valve B on the outflow pipe 16 side also operates in the same way. and close the valve.

In addition, in both the first and second embodiments, only the configuration has been described in which the lock release device converts the flow velocity when an abnormal flow rate flows into a differential pressure using an orifice, and releases the lock using this differential pressure. Of course, a method for releasing the solenoid using an electric signal from a seismometer or the like can be installed in parallel. Further, in the embodiment, the primary side of the differential pressure cylinder is described as a lower chamber and the secondary side is an upper chamber, but the lock may be released by using the opposite configuration.

[Effect of idea]

As explained above, according to the present invention, even if there is a break in either the upstream or downstream water main, both pipes are shut off and water is poured into the water storage tank using only two emergency shutoff valves. can be ensured.
In addition, since it uses a differential pressure sensing method, it does not require a power source, resulting in energy savings.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the overall configuration of an emergency shutoff valve according to a first embodiment of the present invention, FIG. 2 is a left side view of the same, and FIG. Fig. 4 is an explanatory diagram of the main parts showing the second embodiment of the present invention, Figs. 5 and 6 are explanatory diagrams showing the lock release operation, Fig. 7 is an explanatory diagram of piping to the water storage tank, and Fig. 8 is an explanatory diagram of piping to a water storage tank when a conventional emergency shutoff valve is provided with a function equivalent to that of the present invention. A...Emergency shutoff valve (inflow side), B...Emergency cutoff valve (outflow side), T...Water tank, 7, 8...Differential pressure cylinder, 9, 10...Piston rod, 11
... Inflow pipe, 15 ... Orifice, 16 ... Outflow pipe, 17 ... Orifice, 18 ... Long hole link,
19... Pin, 20... Holding lever, 21... Lever, 23... Adjustment weight, 24, 25...
Differential pressure cylinder.

Claims (1)

[Scope of utility model registration request] A valve device interposed in a conduit, a biasing device that rotationally biases a valve body of the valve device in a valve closing direction, and a biasing device that rotates the valve body in an open state against the biasing force of the biasing device. A lock consisting of a lock device that locks the lock, a detection device that operates the differential pressure cylinder when the pressure difference in the pipe exceeds a predetermined set value, and the differential pressure cylinder that releases the lock of the lock device by the operation of the detection device. In the emergency shutoff valve having a release device, the detection device is provided in an inflow pipe and an outflow pipe of the water storage tank, and the two differential pressure cylinders are provided in parallel or in series, and the detection device is provided for the inflow pipe. The upstream pressure of the above-mentioned differential pressure cylinder is introduced into the secondary side and the downstream pressure is introduced into the primary side.For the outflow pipe, the upstream pressure of the detection device is introduced into the primary side, and the downstream pressure is introduced into the secondary side. An emergency shutoff valve for a water storage tank, characterized in that it is configured to be introduced on the next side.