JP2001056065A - Emergency cutoff valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To completely interrupt a channel at the time of an interruption and to quickly restore a channel within a pipe to its original state at the time of a restoration. SOLUTION: Within a synthetic resin valve main body 10, a valve unit 20 for closing valve element 22 in an emergency and interrupting a flow port is mounted. Within the valve main body 10, a communication channel for communicating between a primary side and a secondary side is provided separately from a valve flow port 13, and a valve 30 for opening and closing the communication channel is provided and an opening/closing operation handle of the valve 30 is provided so as to be operable from the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency shutoff valve for automatically shutting off a flow port in an emergency, and more particularly to an emergency shutoff valve for surely restoring a valve when pipes are restored.

[0002]

2. Description of the Related Art A conventional emergency shut-off valve automatically generates a pressure difference between a primary side pressure and a secondary side pressure when a fluid such as a gas inside is blown out due to an abnormality in a secondary pipe. The valve body is closed, and a large amount of gas is spouted at the leak location to prevent a secondary disaster from occurring. This valve is installed, for example, with a shut-off valve unit installed in the pipeline of the underground piping.

[0003]

Therefore, even if an emergency abnormality occurs, the inside of the pipe is automatically shut off and safety is ensured even if leakage of the secondary pipe occurs. However, the abnormal leak state of the pipe is restored. Therefore, when the user wants to return the fluid to the original flow state so that the user can use it, the shut-off valve unit is installed in the pipeline, so the valve unit in the pipeline must be mechanically operated from the outside. Can not. In order to solve this problem, a small hole is usually formed in the valve body of the shut-off valve, so that the fluid always flows little by little from the primary side to the secondary side even when the valve body is closed. Therefore, when the abnormal location of the pipe leakage is restored, the fluid in the primary pipe gradually flows into the secondary pipe through the small hole of the valve body, and the pressure in the secondary pipe rises, and the primary side fluid increases. And the pressures on the secondary side are balanced, and the shut-off valve unit installed in the pipe is returned to the original open state for the first time.

Therefore, the time until the valve element opens, that is, 2
We have to wait for the pressure in the secondary piping to rise,
In particular, the length of the secondary side piping section is long from the installation position of the shutoff valve.
When the volume of the secondary pipe is large, it takes a considerable time for the pressure in the secondary pipe to increase, and there has been a problem that complete recovery cannot be performed during this time. The recovery time can be shortened by increasing the size of the small hole formed in the valve body. However, the flow rate passing through the valve body increases, and the effect at the time of emergency abnormal shutdown is lost. The present invention has been made to solve the above problems, and provides an emergency shutoff valve capable of completely shutting off a flow path when shutting off and quickly restoring a pipe flow path to an original state at the time of restoration. .

[0005]

SUMMARY OF THE INVENTION The gist of the present invention is to provide a flow port through which fluid flows in a valve body made of synthetic resin. A valve unit that closes and shuts off the flow port is mounted, and a communication flow path communicating between the primary side and the secondary side of the valve unit is provided separately from the flow port in the main body. An emergency shut-off valve characterized in that an opening / closing valve is hermetically provided in a main body, and an opening / closing operation handle of the valve is provided so as to be operated from outside. In the above, the valve unit is provided so that the valve body blocks the flow port against the spring when the fluid pressure on the secondary side of the valve unit decreases. In the above, a pressure sensor for detecting the pressure of the fluid is provided at the primary side and the secondary side flow ports of the valve body.

[0006]

According to the present invention, there is provided a communication passage between the primary side and the secondary side separately from the valve unit of the valve body, and a valve for opening and closing the communication passage is provided in the body. is there. Usually, the communication flow path is used in a cutoff state. Therefore, since no small hole is formed in the valve body, the valve body has good responsiveness due to the pressure difference between the primary side and the secondary side, and operates sensitively in the event of a leakage abnormality in the two-side piping, thereby achieving safety. In addition, since the on-off valve operation handle of the communication flow path is provided so as to protrude from the valve main body, when the leak abnormal portion of the 2nd pipe is repaired and restored, when the fluid in the pipe is circulated to the original flow state, The on-off valve handle can be operated from outside the pipe to open the communication flow path, and fluid can flow from the primary side to the secondary side. This communication flow path can be enlarged since it is normally in a closed state. Therefore, the time for opening the valve body of the valve unit and restoring the inside of the pipe line to the flowing state can be greatly reduced. This emergency shut-off valve is provided with pressure sensors in the primary and secondary flow paths, and can detect the pressure in each pipe. In particular, the state of the secondary pressure is monitored, and the shut-off valve unit is used. It is also possible to adjust the secondary pressure.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a sectional view showing an emergency shut-off valve according to an embodiment of the present invention, which is connected to a pipe. The valve body 10 is made of a synthetic resin, and includes a main body 11 forming distribution ports 13 and 14, communication holes 16 and 17 above the main body 11, and a lid body 12 forming an on-off valve 30. The main body 11 and the lid main body 12 are integrally provided by heat fusion. A shut-off valve unit 20 is mounted between the flow ports 13 and 14 of the main body 11, and the primary side flow port 13 of the valve unit 20 is provided.
And the secondary side circulation port 14 are provided with communication holes 16 and 17 penetrating through the upper surface of the main body 11 shown in FIG.
To form a primary communication channel 18 and a secondary communication channel 19.

A shut-off valve unit 20 provided in the main body 11
Has a valve channel 23 formed in a unit case 21 hermetically fitted in a flow opening, and a valve shaft 25 of a valve body 22 is supported at a central portion movably in an axial direction. The valve element 22 is urged in the opening direction by a coil spring 24 and is locked by a locking member 26 so as not to open more than a predetermined opening degree. When the pressure in the flow path 13 becomes larger than the pressure in the flow path 14, the valve body 22 compresses the spring 24 and abuts against a valve seat surface 27 provided on the main body 11.
3 is closed. Therefore, when a large flow rate flows through the secondary flow path 14 due to some abnormality and the secondary pressure drops, the shut-off valve unit is automatically closed to ensure safety.

The lid main body 12 is fused to the upper surface of the main body 11 to form communication passages 18 and 19, and an on-off valve 30 for opening and closing the communication passage is formed. On-off valve 30 in this embodiment
A rotatable stopper 31 having a through flow path 32 in the center is rotatably and sealingly supported at the upper and lower portions, and the valve stem 33 is projected upward. It is fixed. From outside the shut-off valve 10, this handle 34 is
By performing the 0-degree rotation operation, the stopper 31 rotates 90 degrees,
Since the through passage 32 of the stopper faces in a direction perpendicular to the communication channels 18 and 19, the space between the communication channels 18 and 19 is closed.

In an ordinary state, the on-off valve 30 is used in a closed state, and is used from the primary flow path to the secondary flow path through the valve flow path 23 of the shut-off valve unit 20. When the valve unit 20 is automatically closed at the time of abnormality and the secondary side pipe is repaired such as leakage, etc., and it is desired to return the secondary side pipe to the circulation state again, when the on-off valve 30 is operated from outside and opened, the primary side is opened. The fluid in the side flow path 13 flows into the secondary side flow path 14 through the communication path 19, the communication hole 17, via the communication hole 16, the communication flow path 18, and the plug through flow path 32 of the on-off valve. As a result, the pressure in the pipe of the secondary flow path rises, the pressures of the flow path 13 and the flow path 14 are balanced, the valve body 22 of the valve unit 20 opens, and the secondary pipe returns. When the return operation is completed, the on-off valve 30 is closed again to return to the normal state.

Pressure sensors 51 and 52 are provided in the primary side channel and the secondary side channel of the main body, respectively. This pressure sensor 5
The pressure in the flow path 13 and the flow path 14 can be detected by 1, 52, and the pressure difference between the primary side flow path and the secondary side flow path 13 and 14 causes the valve body 22 of the shutoff valve unit to be in a closed state, or An open state can be assumed. Therefore, after repairing the abnormal part of the secondary side piping, the opening / closing valve 30 is opened to increase the secondary pressure, the valve body 22 of the valve unit 20 is automatically returned, and the opening / closing valve 30 is returned to the original state. When returning to the closed state, by checking the pressure difference between the pressure sensors 51 and 52, it can be confirmed whether or not the valve body 22 of the valve unit has automatically returned. After confirming, the on-off valve 30 is closed. Further, even after the on-off valve 30 is closed and returned to the normal state, the pressure sensors 51 and 52 can be detected to check whether there is any abnormality in the secondary piping. Further, in the above embodiment, the embodiment in which the on-off valve 30 is manually opened and closed has been described.
The on-off valve 30 can be automatically opened and closed by detecting the pressure of the pressure sensors 51 and 52, and the secondary pipe can be restored.

[0012]

As described above, the emergency shutoff valve of the present invention
When shutting off, the flow path is completely shut off, so safety is ensured.When the fluid in the pipeline is restored, the flow path in the pipe can be quickly restored to the original state, and the responsiveness of the shut-off valve to the fluid pressure difference As a result, emergency shutdown is ensured and safety is high.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Emergency shut-off valve 11 Shut-off valve main body 12 Lid main body 13 1-side flow path 14 2-side flow path 16, 17
Communication hole 18, 19 Communication flow path 20 Shut-off valve unit 21 Case 22 Valve body 23 Valve flow path 24 Spring 25 Valve shaft 26 Locking member 30 Open / close valve 31 Plug 32 Plug through flow path 33 Valve rod 34 Handle 51, 52
pressure sensor

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takaaki Inotani 2nd Daifuku, Kuwana-shi, Mie Hitachi Metals Co., Ltd. Kuwana Plant (72) Inventor Tomoyuki Minami 5-26-9 Kamikitazawa, Setagaya-ku, Tokyo F-term (reference) 3H060 AA02 AA10 BB10 CC40 DA04 DB13 DC05 DE06 DF05 FF03 FF08 GG04 GG08 HH07 HH14

Claims (3)

[Claims] A valve is provided in a synthetic resin valve body, through which a fluid flows, in which the valve is urged by a spring to close the valve in an emergency to shut off the flow. The unit is mounted, and a communication flow path communicating between the primary side and the secondary side of the valve unit is provided separately from the circulation port in the main body, and a valve for opening and closing the communication flow path is sealed in the main body. Provided
An emergency shutoff valve, wherein an opening / closing operation handle of the valve is provided so as to be operated from outside. 2. The valve unit according to claim 1, wherein when the fluid pressure on the secondary side of the valve unit drops, the valve body blocks the flow port against the spring.
Emergency shut-off valve as described. 3. The emergency shut-off valve according to claim 1, wherein a pressure sensor for detecting a pressure of a fluid is provided at a primary side and a secondary side of the valve body.