JP2002291938A - Automatic valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To check or constantly monitor water leakage from an automatic valve. SOLUTION: The automatic valve provided with a valve for closing a valve seat formed at a partition by dividing inside of a main body into a primary side and a secondary side with a partition is provided with a maintenance valve for separating the secondary side from the valve seat and provided with a detection means operating with low pressure with a control valve is provided at a path which is made into a flowing state from the valve seat in the state of closing the maintenance valve. As result that the detection mans operates in the state of closing the control valve simultaneously with the maintenance valve, water leakage from the valve seat can be detected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic valve used in a watering system particularly in a road tunnel.

[0002]

2. Description of the Related Art In a conventional watering system, for example, when used in a tunnel, its longitudinal direction is set at a predetermined distance.
A fire section is set by dividing the area into 25 m or 50 m, a fire section including the fire point is specified when a fire occurs, and water is sprayed over the entire area of the fire section. FIG. 5 schematically shows the system in this case. The watering system includes a pressurized water supply source such as a pump 2 for supplying fire-extinguishing water in a water storage tank 1, a main pipe 4 connected to the pressurized water supply source, extending into the tunnel 3 and supplying pressurized water into the tunnel 3, A plurality of branch pipes 5 connected to the main pipe 4 in the tunnel 3 are provided.

The main pipe 4 is buried in a so-called inspection path 6 in the tunnel 3 and extends into the tunnel 3. Then, in each fire protection section, the main pipe 4 rises along the side wall of the tunnel 3, and the tip of each tunnel 3
Head 7 for sprinkling pressurized water in a predetermined area
Is connected. One or more required number of water discharge heads 7 are provided depending on the size of the fire protection compartment.
The branch pipe 5 is provided with a gate valve 8 and an automatic valve 10 provided on a secondary side thereof. The automatic valve 10 is opened in the event of a fire or the like to supply pressurized water to the water discharge head 7, and is closed after the fire is extinguished to stop the supply of the pressurized water.

In such an automatic valve 10, as an example, as shown in FIG.
And a secondary body B, a valve body 15 for opening and closing the valve opening, and a cylinder 18 having a piston 17 connected to the valve body 15 and urged by a spring (not shown). And a cylinder device for opening and closing the main valve 15. The primary side A communicates with a pressurizing chamber 34 arranged in the cylinder 18 via a pressurizing flow path 25 having a strainer 19, a remote start valve 20, and an exhaust valve 21. Further, the pressurizing flow path 25 includes a needle valve 26 and a pressure adjusting device 27 and communicates with the secondary side B via a discharge pressure flow path 35.

[0005] When the remote start valve 20 of the pressurizing flow path 25 is opened, the primary pressure is introduced into the pressurizing chamber 34 of the cylinder 18 to push up the piston 17 and open the valve body 15. When the remote start valve 20 is closed, the pressure in the pressurizing chamber 34 is discharged to the secondary side B, and the valve body 15 is closed. In this way, by opening and closing the remote start valve 20 of the automatic valve 10 arranged as necessary, the secondary side B is regulated based on the function of the pressure regulating device 27, and the fire is caused in the section where the fire has occurred. Watering can be performed.

A pressure switch 30 for detecting flowing water, an automatic drainage valve 31, and a maintenance water discharge valve 32 are provided from the secondary side B of the automatic valve 10, and the secondary side B is always emptied by the automatic drainage valve 31 so that maintenance is performed. The water discharge valve 32 allows a water discharge operation for maintenance to be performed when the water control valve 49 is shielded. Further, the drain passage 35 from the pressure adjusting device 27 is connected to the secondary side B, and the automatic valve 10
As in the case of normal opening, the pressure on the secondary side B can be detected by the pressure adjusting device 27 at the time of water discharge for maintenance, and the flow rate adjusting function of the pressure adjusting device 27 allows the pressurizing chamber 3 to be detected.
The degree of pressurization of 4 is adjusted, and the opening of the valve body 15 is adjusted, so that the secondary side B is adjusted to a predetermined pressure.

[0007]

SUMMARY OF THE INVENTION Such an automatic valve 10 is disclosed.
Since the automatic drain valve 31 is provided in the path from the secondary side B, when the water is leaking due to insufficient sealing of the valve body 15 with respect to the valve seat 12, the drainage treatment capacity of the automatic drain valve 31 If it is within the above range, the problem of water discharge from the head 7 is prevented. However, if left untreated, the treatment cannot be performed, and it is conceivable that water is discharged from the head 7 and the inside of the tunnel 6 is flooded. Therefore, it is preferable to detect the leak of the automatic valve 10 at an early stage, and an object of the present invention is to check or constantly monitor the leak of the automatic valve 10.

[0008]

Means for Solving the Problems The first invention is an automatic valve having a valve body which divides the inside of a main body into a primary side and a secondary side by a partition and closes a valve seat formed on the partition. So,
A maintenance valve that isolates the secondary side from the valve seat, and a detection means that operates at a low pressure together with a control valve on a path that is made to flow from the valve seat when the maintenance valve is closed; At the same time, when the control valve is closed, the detection means operates to detect water leakage from the valve seat.

The second invention is an automatic valve provided with a valve body which divides the inside of a main body into a primary side and a secondary side by a partition and closes a valve seat formed in the partition. A monitoring means for monitoring a low pressure or a water level is provided on a secondary side of the main body or a pipe communicating with the secondary side, and it is determined that there is water leakage when the monitoring means operates when the valve body is closed. Things.

Further, in each of the above-mentioned inventions, a controllable water control valve is provided on the primary side of the main body, and the water control valve is controlled to be closed in the presence of water leakage, and a drainage path from the secondary side is provided. An automatic drain valve that opens and drains when the pressure is equal to or lower than a predetermined pressure is provided.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. FIG. 1 is a schematic configuration diagram showing an automatic valve according to a first embodiment, and FIG. 2 shows the automatic valve of FIG. 1 when a maintenance valve body is closed.

In the figure, the automatic valve 10a is
1. A main body 65 has a valve opening 63 formed by a maintenance valve body 62. The valve body 61 is a cylinder device 6 driven to open and close.
7 and the cylinder device 67 includes a valve body 61.
And a cylinder 69 forming a pressurizing chamber C for slidably housing the piston 68 and pressing the piston 68. The maintenance valve body 62 is connected to a maintenance cylinder device 70 that is driven to open and close. The maintenance cylinder device 70 includes a maintenance piston 71 connected to the maintenance valve body 62 and a maintenance piston 7.
And a maintenance cylinder 72 that forms a maintenance pressurizing chamber D that slidably houses the maintenance piston 1 and presses a maintenance piston 71. When the maintenance valve body 62 is closed, the secondary side B is shut off via the valve opening 63. In addition, the maintenance cylinder 62 has a maintenance valve body 62 in a closed state.
An exhaust pressure chamber F communicating with the inside hollow flow path is provided.

A maintenance side control valve 117, which can be remotely opened and closed, is provided in a maintenance side pipe 80 which communicates with the pressure adjusting device 75 from the exhaust pressure chamber F of the maintenance cylinder 72. A pressure switch 118 is provided. The pressure switch 118 for monitoring water leakage can perform a low pressure operation (about 0.01 to 0.02 MPa), and when the maintenance valve body 62 is closed, the maintenance side control valve 11
By closing 7 (the state shown in FIG. 2), it is possible to detect a small pressure rise in the exhaust pressure chamber F via the closed pipe 80.

A pressure adjusting device 75 for adjusting the opening of the valve body 61 in accordance with the pressure on the secondary side B for discharging while restricting the discharge pressure of the piston 68 linked to the valve body 61 includes:
The pipe 78 is connected to a pipe 78 from the secondary side B of the main body 65 via an automatic selection valve 66 and is connected to a pipe 78 from the main body 65 which also serves as an exhaust pressure passage. When closed, a maintenance side pipe 80 through which the flow path is formed is connected to the other side of the automatic selection valve 66. Through this automatic selection valve 66, in both the case of flowing water to the secondary side B and the case of flowing water in the exhaust pressure chamber F, the flowing water is connected to the pressure adjusting device 75 and flows out to the other. Is to be closed.

Further, a drain passage 85 for draining water from the secondary side B of the main body 65 is provided.
An automatic drain valve 115 that closes when pressurized above a predetermined pressure,
A check valve 86 for preventing water from flowing from the opposite side of the flow path is provided.

The operation of the automatic valve 10a shown in FIG. 1 will be briefly described.
1 is fully closed, the remote start valve 112 is closed, the remote test valve 113 is closed, the secondary side B of the main body 65 has no pressure, the pressure switch 114 is off, and the automatic drain valve 115 is not pressurized by flowing water. It is open. When a fire occurs, the remote start valve 112 is remotely opened, the pressurizing chamber C is pressurized, the valve body 61 is opened, and the automatic valve 10 is opened. As a result, flowing water starts, the secondary side B of the main body 65 is pressurized, the pressure switch 114 is turned on, and a flowing water signal is issued. At this time, the automatic drain valve 115 is closed by receiving a pressure equal to or higher than a predetermined pressure by flowing water. On the secondary side B, the opening degree of the valve body 61 is adjusted by the operation of the pressure adjusting device 75 and the pressure is adjusted to a predetermined pressure, and the water is appropriately sprinkled from the water discharge head 7 by the adjusted pressure.

When the fire is restored by extinguishing the fire, the remote start valve 112 is remotely closed. Thereby, the valve element 6
1 is closed, the pressure on the secondary side B is reduced, the pressure switch 114 is turned off, the automatic drain valve 115 is opened, and the residual water on the secondary side B is discharged.

At the time of the water discharge test, the remote test valve 113 is opened remotely, the maintenance pressurizing chamber D of the maintenance valve body 62 is pressurized, and the maintenance valve body 62 is closed. After confirming that the maintenance valve limit switch 111 has been turned on, preparation for the water discharge test is completed. Next, the remote start valve 112 is remotely opened to cause the automatic valve 10 to perform the same operation as in the case of a fire. After confirming the flowing water signal by turning on the pressure switch 114 at this time, the above-described restoration operation is performed. Similarly, the restoration operation of the maintenance valve body 62 is performed by closing the remote test valve 113 to restore the original state. .

Further, at the time of the water leakage test, the maintenance valve body 62 is closed and the maintenance side control valve 117 is remotely closed as in the water discharge test. In this state, it is confirmed that the water leak detection pressure switch 118 does not operate for a predetermined time. If the water pressure detection switch 118 for low pressure operation is operated here, the pressure in the closed exhaust pressure chamber F is rising, and the pressure water in the primary chamber A flows in due to sealing failure of the valve 61 and the like. Will be. After confirming such a result, the maintenance valve body 62 and the maintenance-side control valve 117 are opened and controlled to the original state. Also, when water leakage occurs, the maintenance valve body 62
Can be closed to prevent the actual harm of water discharge from the water discharge head 7. The pressure switch 118 for detecting water leakage
Instead, a detecting means such as a water level sensor can be used.

FIG. 3 is a schematic structural view showing an automatic valve according to a second embodiment.

The automatic valve 10b is the same as the automatic valve 10 shown in the prior art, and the detailed description is omitted.
A main body 14 divided into a primary side A and a secondary side B by a partition 13, a valve body 15 for opening and closing the valve seat 12, and a piston 17 connected to the valve body 15 and urged by a spring (not shown) are internally provided. And performs an opening / closing operation similarly to the automatic valve 10.

The characteristics of the automatic valve 10b are as follows.
The secondary side pipe 5b connected to the secondary side B of the main body 14 through the water control valve 49 is provided with a water leak monitoring pressure switch 121, and the primary side pipe 5a connected to the primary side A of the main body 14. Is provided with an electric water control valve 122 by a motor.

The pressure switch 121 for monitoring water leakage starts when water leaks at the low pressure operation and exceeds the processing capacity of the automatic drain valve 31 and starts to accumulate on the secondary side B. Further, when the water level reaches the pressure switch 121 for monitoring water leakage, the pressure switch is operated. 121 operates. The signal is input to the motorized water control valve 122 via a disaster prevention panel (not shown) or directly, and the motorized water control valve 122 is closed so as to stop water leakage. At this time, even when water is discharged from the water discharge head 7 in the event of a fire, the pressure switch 121 for monitoring water leakage is activated, so it is necessary to add a condition that there is no start signal to the start valve 20.

In place of the pressure switch 121 for monitoring water leakage, monitoring means such as a water level sensor capable of detecting the water level and pressure can be used.
In the method of detecting the water leakage in b, the water leakage can be detected at any time in the normal state, and the water leakage can be stopped at a time when there is no actual harm such as discharge from the water discharge head 7 in combination with the electric water control valve 122.

FIG. 4 is a schematic structural view showing an automatic valve as a third embodiment.

The automatic valve 10c has a first basic structure.
This is the same as the automatic valve 10a of the second embodiment, and the method for detecting and stopping water leakage is the same as that of the second embodiment. Although a detailed description is omitted, a valve opening 63 formed by a valve element 61 and a maintenance valve element 62 is provided in the main body 65, and the valve element 61 is connected to a cylinder device 67 that is driven to open and close. , A piston 68 connected to the valve body 61 and a piston 68
And a cylinder 69 forming a pressurizing chamber C for pressing the pressure. The maintenance valve body 62 is connected to a maintenance cylinder device 70 that is driven to open and close. The maintenance cylinder device 70 has a maintenance piston 71 connected to the maintenance valve body 62, and the maintenance piston 71 is slidable. And a maintenance cylinder 72 which forms a maintenance pressurizing chamber D which presses the maintenance piston 71 while being housed therein.

As a feature of the automatic valve 10c, as in the second embodiment, a water leakage monitoring pressure switch 121 connected to the secondary side B of the main body 65 is provided. A motor-driven water control valve 122 is provided on the primary side pipe 5a connected to A, and water leaks beyond the processing capacity of the automatic drain valve 115 and starts to accumulate on the secondary side B. When the water level further rises, the pressure for monitoring water leakage is increased. The switch 121 operates to close the electric water control valve 122 so as to stop the water leakage based on the signal. At this time, the condition that there is no start signal to the start valve 20 is also necessary, and the means that can detect a water level, a pressure, and the like can be used instead of the pressure switch 121 for monitoring water leakage. In the case of the automatic valve 10c, the maintenance valve body 62 may be closed without using the electric water control valve 122, and may be closed while draining water separately. In such a method for detecting water leakage of the automatic valve 10c, it is possible to detect water leakage at any time in a normal state, and to stop the water leakage at a time when there is no actual harm such as discharge from the water discharge head 7 in combination with the electric water control valve 122. it can.

In each of the above embodiments, the first embodiment has a configuration in which the automatic valve 10a is provided with a structure for detecting a water leak by a water leak test, and the second and third embodiments have a structure in which the automatic valves 10b and 10c are provided. It is provided with a configuration for water leakage monitoring to cope with the occurrence of water leakage, and it goes without saying that these can be combined or the components can be replaced with corresponding members.

Based on the above embodiments, the first invention is directed to a valve for partitioning the inside of a main body into a primary side and a secondary side by a partition and closing a valve seat formed on the partition. An automatic valve having a body, comprising a maintenance valve for isolating the secondary side from the valve seat, and detecting at a low pressure together with a control valve on a path which is made to flow from the valve seat when the maintenance valve is closed. By providing means, the detection means operates when the control valve is closed at the same time as the maintenance valve, so that water leakage from the valve seat can be detected, and measures can be taken before actual harm occurs.

According to a second aspect of the present invention, there is provided an automatic valve provided with a valve body for dividing a main body into a primary side and a secondary side by a partition and closing a valve seat formed on the partition. A monitoring means for monitoring a low pressure or a water level is provided on the secondary side of the main body or a pipe communicating with the secondary side, and when the monitoring means is operated when the valve body is closed, it can be determined that there is water leakage, and actual harm is caused. Can be addressed before the occurrence of the problem.

Further, in each of the above inventions, a controllable water control valve is provided on the primary side of the main body, and when the water leakage exists, the water control valve is controlled to close to stop the water leakage. An automatic drain valve that opens and drains when the pressure is equal to or lower than a predetermined pressure is provided in a drain path from the next side so that a small amount of water leakage does not cause any actual harm.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an automatic valve according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing another state of FIG. 1;

FIG. 3 is a schematic configuration diagram showing an automatic valve according to a second embodiment using the present invention.

FIG. 4 is a schematic configuration diagram showing an automatic valve according to a third embodiment using the present invention.

FIG. 5 is a schematic system diagram showing a conventional watering system.

FIG. 6 is a schematic configuration diagram showing the automatic valve of FIG. 5;

[Explanation of symbols]

 10a, 10b, 10c Automatic valve 118, 121 Leakage monitoring pressure switch 117 Maintenance side control valve 122 Electric water control valve

Claims (4)

[Claims] 1. An automatic valve provided with a valve body for dividing a main body into a primary side and a secondary side by a partition and closing a valve seat formed in the partition, wherein A maintenance valve that isolates the side, and a detection means that operates at a low pressure together with a control valve is provided on a path that is made to flow from the valve seat in the maintenance valve closed state, and the maintenance valve and the control valve are closed when the control valve is closed. An automatic valve, wherein the detection means operates to detect water leakage from the valve seat. 2. An automatic valve provided with a valve body for dividing a main body into a primary side and a secondary side by a partition and closing a valve seat formed on the partition, wherein the secondary side of the main body or An automatic valve, wherein a monitoring means for monitoring low pressure or water level is provided in a pipe communicating with the secondary side, and when the monitoring means operates when the valve body is closed, it is determined that there is water leakage. 3. The automatic valve according to claim 1, wherein a controllable water control valve is provided on the primary side of the main body, and the water control valve is closed and controlled in the presence of water leakage. 4. The automatic valve according to claim 1, wherein an automatic drain valve that opens and drains when the pressure is equal to or lower than a predetermined pressure is provided in a drain path from the secondary side.