JPS6120379Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an emergency shutoff device for a tank bottom valve that is remotely controlled by a fluid such as air.

Generally, in tank trucks that transport flammable liquids such as oil and gasoline, in addition to the control section on the top of the tank that opens and closes the tank bottom valve, there is also an emergency control section that allows you to open and close the tank bottom valve without climbing to the top of the tank. It is mandatory to provide an operating section for

However, if a fire occurs near the opening/closing operation part of the bottom valve and the operator becomes inaccessible, the tank bottom valve will not be able to be closed, and there is a risk that the liquid in the tank will flow out and cause a catastrophe.

The present invention was developed in view of the above points, and it allows remote control of the tank bottom valve using pressure fluid, and branches a bypass pipe closed with flammable or easily soluble material into the pressure fluid piping for remote control. In addition, the tank bottom valve can be automatically closed even if a fire breaks out and the opening/closing operation part cannot be approached.

EMBODIMENT OF THE INVENTION Hereinafter, the structure of this invention will be explained about an Example based on drawing.

As shown in FIGS. 1 to 3, 1 is a tank of a tank lorry, which is mounted on the vehicle body.The inside of the tank body 2 is divided into a plurality of storage chambers 3, and each chamber 3 has a bottom valve. 4 is provided.

The bottom valve 4 opens and closes an opening 5 formed in the bottom of the tank body 2, and is composed of a support 6 fixed around the opening 5 and a valve unit 7 guided and supported by the support 6. Ru.

The support body 6 protrudes downward from the bottom of the tank body 2 and is fixed in the front-rear direction, and includes a gutter member 9 and a gutter member 9 connected to a discharge pipe 8 provided at the lowest central part of the tank.
The guide member 10 is connected to the guide member 10. The valve unit 7 is fitted into the guide member 10 and consists of a casing 11 having a valve seat formed at its tip, a valve body 12, and an actuating portion 13 of the valve body 12, and is connected below the opening 5. ing. The lower part of the casing 11 is detachably fixed to the guide member 10 by a lid 14, while the valve element 12 is seated on a valve seat formed on the upper part of the casing 11 to open and close the discharge port 15 on the upper surface of the casing 11. .

The actuating part 13 is built into the casing 11 and moves the valve body 12 up and down using air pressure.
A piston 16 fitted to the casing 11 so as to be slidable up and down, a rod 17 connecting the valve body 12 and the piston 16, a fluid chamber 18 defined by the piston 16, the casing 11, and the lid 14, and the valve body 12. It is composed of a compression spring 19 that biases the discharge port downward in the direction of closing the discharge port.

In addition, the fluid chamber 18 has a pressing member 2 for the compression spring 19.
0 is provided, and the compression spring 19 is
0 flange part and support piece 17' at the lower end of rod 17
is interposed between.

Note that 21 is an air port bored in the lid 14 and opens into the fluid chamber 18, and 22 is a strainer fixed to the bottom of the tank.

FIG. 3 shows the air control circuit 23 of the bottom valve 4, in which a control passage 26 in which an air pressure source 24 and an emergency valve 25 are connected in series is branched into five branch passages 27 corresponding to the bottom valve 4. Two bottom-operated valves 28 with branch passages 27 located at the top and bottom of the tank.
are connected in parallel, and then connected to the air port 21 of the bottom valve 4 via the shuttle valve 29, while a bypass pipe 30 is connected in the middle of the branch passage 27,
The tip of the bypass pipe 30 is closed with a combustible or easily soluble material 31, such as U alloy.
The combustible or easily soluble material 31 is housed in the main body 32 in advance as shown in FIG. The main body 32 is configured to be easily attached to and detached from the bypass pipe 30.

Next, the operation of the bottom valve 4 will be explained. As shown in FIG. 2, when the operating valve 28 is opened from the closed state of the valve body 12, compressed air is supplied to the fluid chamber 18 and the piston 16 moves upward against the spring force of the compression spring 19. , the valve body 12 via the rod 17
moves upward, the discharge port 15 is opened, and the liquid in the storage chamber 3 is discharged to the outside through the discharge port 15, the gutter member 9, and the discharge pipe 8.

When closing the valve body 12, when the operation valve 28 is shut off, the compressed air in the fluid chamber 18 is released to the atmosphere by the operation valve 28, and the valve body 12 is moved downward by the spring force of the compression spring 19. Then, the discharge port 15 is closed.

In addition, in the event of an emergency discharge stop, the full bottom valve 4 is closed at once by operating the emergency valve 25 located in the driver's seat, etc., and releasing the compressed air to the atmosphere through the emergency valve 25. do.

In addition, in the unlikely event that a fire occurs during the work of storing liquid in the tank body 2 through the tank bottom valve 4 or during the work of discharging the liquid in the tank body 2 through the tank bottom valve 4, If the opening/closing operation becomes impossible, the flammable or easily soluble material 31 of the bypass pipe 30 burns or melts and is released to the atmosphere, causing the air in the fluid chamber 18 to compress the spring of the compression spring 19. The water will flow out due to force and the outlet will be closed, preventing the spread of fire.

In the present invention as described above, a bypass pipe is connected in the middle of the fluid piping to the bottom valve, and the bypass pipe is closed with a flammable and easily soluble material, so the bypass pipe can be placed at any suitable location in the tank. In addition, when one of the bypass pipes is cut off, all bottom valves are immediately closed, making work extremely safe.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the present invention, in which FIG. 1 is a partially sectional side view of the tank, FIG. 2 is a central vertical sectional view of the bottom valve, FIG. 3 is a pneumatic control circuit diagram of the bottom valve, and FIG. FIG. 4 is a sectional view of the main body. 2...Tank body, 4...Bottom valve, 5...Opening,
7... Valve unit, 12... Valve body, 13... Operating section, 18... Fluid chamber, 21... Air port, 2
5...Emergency valve, 30...Bypass pipe.

Claims (1)

[Scope of utility model registration request] A valve element is provided which is biased by a spring in a direction that permanently closes a plurality of openings formed at the bottom of the tank body, and pressure fluid is supplied to a cylinder linked to the valve element, or In a tank bottom valve configured to open and close a valve body by discharging pressure fluid, a bypass pipe is branched into a fluid pipe connecting the cylinder and a fluid pressure source, and the bypass pipe is connected to a flammable or easily soluble An emergency shutoff device for a tank bottom valve, characterized in that it is closed by a material.