JP6923154B2 - Emergency valve device - Google Patents

Description

The present invention relates to an emergency operation valve device installed in a pipeline or the like connecting an emergency water tank and a water main, which is used in the event of an earthquake disaster or the like.

Conventionally, emergency water tanks have been buried in roads, school yard, or in the basement of parks in order to secure living water for local residents or to use water for fire extinguishing in the event of a disaster such as an earthquake. ..

In this emergency water storage tank facility, as shown in FIG. 2, a bypass pipe P is generally provided in the water main S via the on-off valves V1 and V2, and a water storage tank (tank) T is provided in the bypass pipe P. An emergency operation valve V is provided in the bypass pipe P, and an open valve V3 is provided in the water main S between the bypass pipes P.
In the figure, the on-off valves V1, V2, and V3 are open in white and closed in black. The white and black coatings are the same for the other on-off valves V4 to V6 and the valves shown in FIGS. 1A to 1G.

In this emergency water storage tank facility, as shown in FIG. 6A, water a is flowed as shown by an arrow by an emergency actuating valve V in normal times to store water in the water storage tank T and in the water storage tank T. It prevents water from stagnation and prevents spoilage. On the other hand, in an emergency (emergency, abnormal) such as an earthquake, the emergency actuating valve V allows water a to flow as shown by the arrow in the figure (b) to secure the flow of the water main S. At the same time, the water storage tank T is cut off from the water main S to prevent the outflow of water from the water storage tank T due to the siphon phenomenon and secure the water.

As an emergency shutoff device in this emergency water tank facility, a technology has been developed that can automatically switch the flow direction of water a between normal and emergency, and can select self-holding and automatic recovery in an emergency. (Patent Documents 1 and 2).
This emergency shutoff device controls the emergency actuating valve V provided in the bypass line P by a pilot valve based on the water pressure on the water main S side to perform the above switching operation and the like (Patent Document 1 paragraph). 0020 to 0038, FIGS. 1 to 7, patent documents 2 paragraphs 0013 to 0059, FIGS. 1 to 11, see the embodiment of FIG. 1 below).
In FIG. 2, in the following embodiment, V4 is a valve composed of a valve body 16a and a valve seat 15a, V5 is a valve composed of the valve body 16b and a valve seat 15c, and V6 is a valve body 16b. It is a valve composed of a valve seat 15b and a valve seat 15b.

Japanese Unexamined Patent Publication No. 9-317910 Japanese Unexamined Patent Publication No. 11-22836

In the conventional emergency shutoff device, the emergency operation valve V is controlled by a pilot valve based on the water pressure on the water main S side. Therefore, at the time of the return, the water pressure of the water main S is the set pressure of the pilot valve (emergency operation valve V). The emergency operation valve V does not operate unless the return set pressure is reached (the tap water a is not circulated to the water storage tank T).
However, even if the water main S does not reach the normal state (water pressure), water may be flowing through the water main S, and if there is this water circulation, the water is also supplied to the water tank T. It is preferable to distribute the water to eliminate the retention of water.

At this time, the conventional emergency shutoff device operates the emergency actuating valve V by the water pressure of the water main S or a communication means (communication signal) from the outside, for example, an operation room such as a water monitoring room far away. No means have been built. Therefore, although the water pressure of the above water main S is not set to the return set value, water flows through the water main S, and it is desired to restore the emergency operation valve V and allow water to flow to the water tank T. The worker must go to the place where the emergency shutoff device is installed and manually return the emergency actuating valve V to distribute water to the storage tank. This is complicated.

In view of the above circumstances, it is an object of the present invention to enable water distribution to a water tank by communication from the outside or the like.

In order to achieve the above object, in the above-mentioned emergency shutoff device, the present invention provides a bypass circuit in which an electromagnetic valve that opens and closes by communication from the outside is provided in parallel with the pilot pipe in which the pilot valve is provided. I decided to do it.
If the solenoid valve is opened from the outside, the emergency operation valve is restored through the bypass circuit, and tap water is circulated to the storage tank.

The specific configuration of the present invention is to provide an emergency actuating valve with a pressure-sensitive pilot valve attached to the water main, and to apply the fluid pressure of the water main through the pilot valve through the pilot pipe. When the pressure inside the water main is abnormal, the pilot valve detects the abnormal pressure, and by the detection operation, the valve body drive unit is operated to open and close the emergency operation valve, and the abnormality is detected. When the pressure becomes normal, the pilot valve detects the normal pressure, and the detection operation activates the valve body drive unit to return the emergency operation valve. and automatically operates to freely flow through the pilot tube, the opening and closing operation completion of the emergency operation valve by the valve body driving portion during abnormal and manually operated shut off the pilot tube, and an external electric signal to the pilot tube A bypass circuit with an electromagnetic valve that opens and closes is provided in parallel.

In this configuration, the electric signal from the outside may be an electric signal from the water management room, an electric (detection) signal from a water pressure (flow rate) meter, a seismometer, or the like of the water main. For example, the water pressure gauge of the water main can be provided, and the solenoid valve can be opened and closed by the detection signal of the water pressure gauge.
Further, an electromagnetic valve is provided in the pilot pipe, and the solenoid valve interposed in the pilot pipe is opened and closed by the detection signal of the water pressure gauge, and the opening and closing of the solenoid valve is performed to open and close the emergency operation valve via the pilot pipe. It can be done.
In the above case, the solenoid valve of the bypass circuit and the solenoid valve of the bypass circuit are used by a communication signal from a distant operation room instead of the detection signal of the water pressure gauge, or by a communication signal from a distant operation room in combination with the detection signal of the water pressure gauge. One or both of the solenoid valves provided in the pilot tube can be opened and closed.

As described above, the present invention makes it possible to open and close the electromagnetic valve of the bypass circuit from the outside, so that the water flow to the water main S even though the water pressure of the water main S is not the return set pressure of the pilot valve. If there is, for example, the emergency actuating valve can be operated by the detection signal of the water pressure gauge of the water main or the communication means from the water monitoring room to distribute the water from the water main to the water tank. Therefore, the contamination of the stored water due to the retention of water in the water storage tank can be quickly eliminated.

Schematic diagram for explaining the operation of one embodiment of the emergency shutoff device according to the present invention. Schematic diagram for explaining the operation of one embodiment of the emergency shutoff device according to the present invention. Schematic diagram for explaining the operation of one embodiment of the emergency shutoff device according to the present invention. Schematic diagram for explaining the operation of one embodiment of the emergency shutoff device according to the present invention. Schematic diagram for explaining the operation of one embodiment of the emergency shutoff device according to the present invention. Schematic diagram for explaining the operation of one embodiment of the emergency shutoff device according to the present invention. Schematic diagram for explaining the operation of one embodiment of the emergency shutoff device according to the present invention. An outline example of the emergency water tank equipment is shown, where (a) is normal and (b) is emergency.

An embodiment of the emergency shutoff device according to the present invention is shown in FIGS. 1A to 1G, and 10 is a valve box of an emergency operation valve (four-way port switching valve) V, which is a first port (port) 11a and a second port. It has a port (mouth) 11b, a third port (mouth) 11c, and a fourth port (mouth) 11d.
A valve rod 12 is inserted in the center of the valve box 10, and partition walls 13a, 13b, 13c that cross the valve rod 12 are provided in the valve box 10, and the first chamber 14a, second of the first port 11a. It is divided into four chambers: a second chamber 14b of the port 11b, a third chamber 14c of the third port 11c, and a fourth chamber 14d of the fourth port 11d.
Communication holes through which the valve rod 12 penetrates are formed in the partition walls 13a, 13b, and 13c, and the peripheral edges of the holes are the first, second, and third valve seats 15a, 15b, and 15c.

The valve rod 12 is provided with valve bodies 16a, 16b that are in contact with and separated from the valve seats 15a, 15b, 15c. As shown in FIG. 1A, when the lower valve body 16b is in contact (closed) with the second valve seat 15b, the upper valve body 16a is separated (opened) from the first valve seat 15a. On the other hand, as shown by a solid line from the chain line in FIG. 1B, when the lower valve body 16b separates from the second valve seat 15b (opens the valve) and comes into contact with (closes) the third valve seat 15c, the upper valve body 16b closes. The valve body 16a of the above is designed to abut (close) the first valve seat 15a. A seal is provided on the contact surface of the valve bodies 16a and 16b with the valve seats 15a, 15b and 15c to ensure watertightness.

A valve body driving unit 20 is configured on the upper part of the valve box 10. In the valve body driving portion 20, the upper end of the valve rod 12 is inserted through the cylinder-shaped tubular portion 21 at the upper part of the valve box 10, and the piston 22 is fixed in the middle thereof. The piston 22 is pushed downward by the spring 23. By appropriately setting the urging force of the spring 23, the valve rod 12 is lowered by the spring 23 when the pressure becomes equal to or lower than the set pressure. A pilot valve 30 is connected to the opposite side of the spring 23 of the cylinder 22 via a pilot pipe 25.

The pilot valve 30 is a three-way valve having a first port (port) 31a, a second port (port) 31b, and a third port (port) 31c, and a cylinder 33 with a built-in spring 32 is provided above the valve box 31. It is a thing. The first port 31a is connected to the pilot pipe 26 communicating with the first chamber 14a of the valve box 10 of the emergency actuating valve V, the second port 31b is connected to the pilot pipe 25, and the third port 31c is an on-off valve. It is open to the outside air via 35a. The valve 35a is always open. A diaphragm 34 is stretched in the cylinder 33 and is divided into two upper and lower chambers. The valve rod 35 protruding from the valve box 31 into the cylinder 33 is integrated with the diaphragm 34, and the valve body (piston) 36 moves up and down according to the deflection of the diaphragm 34 to selectively select the valve seats 36a and 36b. Get in and out of.

The lower end of the spring 32 in the cylinder 33 is in contact with the diaphragm 34, and the other end is in contact with (received) the spring receiver 37. The spring receiver 37 moves in the cylinder 33 according to the screwing amount of the bolt 38 to expand and contract the spring 32. Therefore, the urging force of the spring 32 is adjusted by the screwing amount of the bolt 38, and the movement of the valve stem 35, that is, the applied pressure to the diaphragm 34 in which the valve body 36 is brought into contact with and separated from the valve seats 36a and 36b can be adjusted. .. The application is made through the pilot port 39 via the pilot pipe 27 branched from the pilot pipe 26.

In a state where a pilot pressure such as water pressure is applied to the diaphragm 34 from the pilot pipe 27 to the pilot valve 30, the pressure is the set pressure by the spring 32 (the shutoff set pressure of the emergency operation valve V <return set pressure). When it is higher, as shown in FIG. 1A, the pressure causes the diaphragm 34 to bend upward, the valve rod 35 also rises, and the valve body 36 presses (closes) the second valve seat 36b. The flow paths of the port 31a and the second port 31b are open, and the flow paths of the second port 31b and the third port 31c are closed. Therefore, the water pressure of the first chamber 11a of the valve box 10 is applied to the valve body driving unit 20 via the pilot pipe 26, the pilot valve 30, and the pilot pipe 25. By this application, the piston 22 rises against the spring 23, the lower valve body 16b of the emergency actuating valve V comes into contact with the second valve seat 15b, and the upper valve body 16a separates from the first valve seat 15a. , The emergency actuating valve V is opened.

In this state, for some reason such as an earthquake, for example, the water pressure of the water main S is lowered, the pilot pressure of the pilot valve 30 via the pilot pipe 27 is lowered, and the set pressure by the spring 32 (cutoff set pressure). When it becomes lower, the diaphragm 34 bends downward due to the spring 32, and the valve rod 35 also descends, so that the valve body 36 separates from the second valve seat 36b and becomes the first valve seat 36a as shown by the solid line from the chain line of FIG. 1C. Contact. Then, the space between the first and second ports 31a and 31b is closed. Therefore, the water from the pilot pipe 25 to the valve body drive unit 20 stops, and the water in the valve body drive unit 20 passes through the pilot pipe 25 to the second port 31b and the third port 31c of the pilot valve 30. Is discharged through. Therefore, in the emergency actuating valve V, the lower valve body 16b separates from the second valve seat 15b and comes into contact with the third valve seat 15c due to the spring 23, as shown by the solid line from the chain line in FIG. The valve body 16a comes into contact with the first valve seat 15a, and the emergency actuating valve V closes (closes).

The above configuration is substantially the same as the emergency shutoff device of Patent Document 2, and the present invention provides the solenoid valve 40 in the pipelines of the pilot pipe 25, the pilot valve 30, and the pilot pipes 26 and 27 in the emergency shutoff device. The feature is that the bypass circuits 41 are provided in parallel. Further, in this embodiment, the pilot tube 25 is provided with the opening / closing solenoid valve 29 and the mode switching solenoid valve Vb, the opening / closing solenoid valve 28 in the valve body drive unit 20 is provided, and the bypass circuit 41 is provided with the mode switching solenoid valve Va. In addition to being provided, a manual on-off valve is appropriately provided in each pipe.
The mode switching solenoid valves Va and Vb are valves for switching between automatic operation (AUTO MODE) and manual operation (MANUAL MODE), and are operated by a signal from an external signal (for example, a water management room) (not shown), and FIGS. 1A to 1D. In the case of the former, FIGS. 1E to 1G show the respective actions of the latter case.

Normally, the opening / closing solenoid valves 28, 29, and 40 are closed, open, and open, respectively, and the mode switching solenoid valves Va and Vb are closed and open, respectively. When the opening / closing solenoid valves 28, 29, 40 receive a certain signal (signal 1), the opening / closing solenoid valves are interlocked to open / close in the reverse order, and the mode switching solenoid valves Va, Vb are signals (signal 2) different from the signal 1. When it receives, it opens and closes in the opposite direction to the normal one. The signal 1 may be a signal from a water pressure gauge 42, a seismograph, or the like, or a signal from a water supply control room. The water pressure gauge 42 detects the water pressure in the first chamber 14a of the emergency operation valve V, that is, the water pressure of the water main S. Signal 2 is a manual signal from the water management room. The opening / closing solenoid valves 28, 29, 40 and Va, Vb can be opened / closed by separate signals. Further, the solenoid valves Va and Vb for mode switching can be manual valves that are manually opened and closed at the site.
Needless to say, electric devices such as the water pressure gauge 42, the solenoid valves 40, 28, 29, Va, and Vb are appropriately connected to the power source. However, the power source may be a self-supporting power source (for example, a solar cell) or may be switched to a storage battery in an emergency such as an earthquake.

This embodiment has the above configuration, and when used in the emergency water tank facility of FIG. 2, the water main S side of the bypass pipe P is connected to the first and fourth ports 11a and 11d, and the water tank T side is used. Is connected to the second and third ports 11b and 11c, respectively.

In this connected state, in AUTO MODE, as shown in FIG. 1A, the water pressure in the water main S also has a predetermined value in normal times, and the piston 22 presses the spring 23 via the pilot valve 30 with the water pressure. A state in which the valve body 16b is in contact with the second valve seat 15b and the valve body 16a is separated from the first valve seat 15a by compressing and moving upward (top dead center position) and the valve rod 12 is also located above. To maintain. In this state, the first chamber 14a and the second chamber 14b, the third chamber 14c and the fourth chamber 14d communicate with each other, and the water a of the water main S flows as shown by the arrow in FIG. 2A. It passes through the water tank T.

In this normal time, when it is desired to stop the flow of water to the water tank T for some reason, as shown in FIG. 1B, the opening / closing solenoid valve 28 is opened by a signal 1 from an external signal (for example, a water management room) (not shown). At the same time, the opening / closing solenoid valve 29 is closed to eliminate the water supply from the pilot pipe 25 to the valve body driving unit 20 (cylinder body 21). Then, since the water is drained from the tubular body 21 via the opening / closing solenoid valve 28, the piston 22 is moved downward by the spring 23 (bottom dead center position) as shown by the solid line from the chain line in the figure, and the valve rod 12 The valve body 16b separates from the second valve seat 15b and comes into contact with the third valve seat 15c, and the valve body 16a comes into contact with the first valve seat 15a. In this state, the first chamber 14a and the fourth chamber 14d communicate with each other, and the second and third chambers 14b and 14c are cut off from the first and fourth chambers 14a and 14d. a flows as shown by the arrow in FIG. 2B, tap water does not flow into the water tank T, and the water in the water tank T does not flow out.

On the other hand, in an emergency such as an earthquake, when the water pressure in the water main S drops due to damage to the water main S, the water pressure drops completely in the cylinder 31 via the pilot valve 30. It is not applied or the water pressure drops considerably. Therefore, as shown by the solid line from the chain line in FIG. 1C, the water pressure applied from the pilot pipe 27 to the diaphragm 34 of the pilot valve 30 becomes equal to or less than the shutoff set pressure, and the valve body 36 is pushed by the spring 32 from the valve seat 36b. Separately abuts on the valve seat 36a and communicates between the second port 31b and the third port 31c. Then, the water is drained from the valve body driving unit 20 (cylinder body 21) via the pilot pipe 25 and the pilot valve 30. Therefore, as shown by the solid line from the chain line in the figure, in the emergency operation valve V, the piston 22 is moved downward by the spring 23, and the valve body 16b separates from the second valve seat 15b and hits the third valve seat 15c. At the same time, the valve body 16a comes into contact with the first valve seat 15a. In this state, the first chamber 14a and the fourth chamber 14d communicate with each other, and the second and third chambers 14b and 14c are cut off from the first and fourth chambers 14a and 14d. Similarly, the water main The water a of S flows as shown by the arrow in FIG. 2B, tap water does not flow into the water tank T, and the water in the water tank T does not flow out.

Further, in the event of an emergency such as an earthquake, regardless of the water pressure in the water main S, as shown in FIG. When the 28 is opened, the solenoid valve 29 is closed, the water supply from the pipe pilot pipe 25 to the valve body drive unit 20 (cylinder 21) is stopped, and the cylinder 21 is closed via the opening / closing solenoid valve 28. It is designed to be drained from. In this case, as shown by the solid line from the chain line in the figure, the piston 22 is moved downward by the spring 23 (bottom dead center position), the valve stem 12 is also located downward, and the valve body 16b is from the second valve seat 15b. The valve body 16a comes into contact with the first valve seat 15a while being separated from the third valve seat 15c. In this state, the first chamber 14a and the fourth chamber 14d communicate with each other, and the second and third chambers 14b and 14c are cut off from the first and fourth chambers 14a and 14d, and the water in the water storage tank T. Will not leak.

In the above closed state of the water storage tank T, the water pressure of the water main S rises and is lower than the return set pressure (set by the spring 32) set by the pilot valve 30 of the emergency operating valve V (by the spring 23). When the water pressure value is higher than the pressing pressure), as shown in FIG. 1E, the mode is switched by an external signal (for example, a signal 2 from the water supply control room) different from the signal 1 to the opening / closing solenoid valves 28, 29, 40. The solenoid valve Va is opened and the Vb is closed (switched to MANUAL MODE). The signal can also be transmitted based on the signal 2 or the like from the water pressure gauge 42.
When switching to this MANUAL MODE, as shown in FIG. 1E, water a from the water main S flows into the valve body operating portion 20 (cylinder body 21) via the first chamber 11a and the bypass pipe 41. Push up the piston 22. Therefore, the valve body 16b comes into contact with the second valve seat 15b, and the valve body 16a is separated from the first valve seat 15a, so that the first chamber 14a and the second chamber 14b, the third chamber 14c and the fourth chamber are separated. 14d communicates with each other, and the water a in the water main S flows as shown by the arrow in FIG. 2A and passes through the water storage tank T. That is, even if the water pressure in the water main S is temporarily lowered for some reason, it can return to the state of flowing water to the water storage tank T.

In the state shown in FIG. 1E, if the water pressure of the water main S becomes equal to or higher than the return set pressure, it may be left as it is in the normal state as a MANUAL MODE, but when returning to the AUTO MODE, an external signal (for example, water supply) is used. As shown in FIG. 1A, the mode switching solenoid valve Vb is opened and the mode switching solenoid valve Vb is closed by the signal 2) from the control room. Then, the water pressure flows into the pilot valve 30 through the pilot pipe 26 to open the valve, and the pressure reaches the valve body operating portion 20 to maintain the open state of the emergency operating valve V. That is, the AUTO MODE is in a normal state via the pilot valve 30.

In the case of manual operation (MANUAL MODE), in normal times, by an external signal (for example, signal 2 from the water management room), as shown in FIG. 1F, the mode switching solenoid valve Va is opened, the Vb is closed, and the figure is shown. When used for the emergency water tank equipment of 2, the water main S side of the bypass pipe P is set to the first and fourth ports 11a and 11d, and the water tank T side is set to the second and third ports 11b and 11c. Connect to each.

In this normal time, in an emergency (abnormal time) when an earthquake or the like occurs, the opening / closing solenoid valve 28 is opened and the opening / closing solenoid valve 28 is opened by a signal 1 from the seismograph or the control room as shown in FIG. 1G. Close the valve 40. Then, the water supply from the bypass circuit 41 to the valve body drive unit 20 (cylinder body 21) is stopped, and the water is drained from the cylinder body 21 via the opening / closing solenoid valve 28. Therefore, as shown by the solid line from the chain line in the figure, the piston 22 is moved downward by the spring 23 (bottom dead center position), the valve stem 12 is also located downward, and the valve body 16b is from the second valve seat 15b. The valve body 16a comes into contact with the first valve seat 15a while being separated from the third valve seat 15c. In this state, the first chamber 14a and the fourth chamber 14d communicate with each other, and the second and third chambers 14b and 14c are cut off from the first and fourth chambers 14a and 14d, and the water in the water storage tank T. Will not leak.

In the state of FIG. 1G, in order to open (open) the emergency actuating valve V, the water pressure must be equal to or higher than the return set pressure or the pressing pressure of the spring 23, and a manual external signal (for example, water management). From the signal 1) of the chamber, as shown in FIG. 1F, the opening / closing solenoid valve 28 is closed and the opening / closing solenoid valve 28 is opened.

The emergency actuating valve V is not limited to the embodiment of the above embodiment, and if it has a configuration in which the present invention can be adopted, for example, FIGS. 1 to 6 of Patent Document 1 and FIGS. 8, 9 and 9 of Patent Document 2. Of course, it can also be used for the emergency shutoff device shown in 10.
Thus, the embodiments disclosed this time should be considered to be exemplary in all respects and not restrictive. The scope of the present invention is indicated by the claims and is intended to include all modifications within the meaning and scope equivalent to the claims.

S Water main T Reservoir (tank)
V Emergency operating valve Va, Vb Solenoid valve for mode switching 10 Emergency operating valve valve box 11a, 11b, 11c, 11d Emergency operating valve V port (mouth)
12 Valve rod 14a First chamber 14b Second chamber 14c Third chamber 14d Fourth chamber 15a, 15b, 15c Valve seat 16a First valve body 16b Second valve body 21 Cylinder 22 Piston 23 Spring 25, 26 , 27 Piston tubes 28, 29 Solenoid valve for opening and closing 30 Piston valves 31a, 31b, 31c Ports (mouths) of pilot valves 30
32 Pilot valve spring 33 Pilot valve cylinder 34 Pilot valve diaphragm 35 Pilot valve valve shaft 36 Pilot valve valve body 36a, 36b Pilot valve valve seat 40 Opening and closing solenoid valve 41 Bypass circuit

Claims (4)

Emergency operation valve to which attached pressure-sensitive pilot valve (30) to the water mains (S) with (V) is interposed, the fluid pressure of the water mains (S), the pilot tube (25, 26, 27) It is guided to the valve body drive unit (20) of the emergency operation valve (V) through the pilot valve (30) , and when an abnormality occurs in the internal pressure of the water main (S), the abnormal pressure is applied to the pilot valve (20). 30) detects it, and by the detection operation, the valve body drive unit (20) is operated to open and close the emergency operation valve (V), and when the abnormal pressure becomes normal pressure, the normal pressure is applied. In an automatic return type emergency actuating valve device that detects by the pilot valve (30) and activates the valve body drive unit (20) to return the emergency actuating valve (V) by the detection operation.
The pilot tube and automatic operation and freely flow through the (25, 26, 27), said pilot tube during opening and closing operation completion of the valve body drive unit during the abnormality (20) according to the emergency operation valve (V) (25) a manual activation by blocking, and the pilot tube (25, 26, 27), is provided in parallel to bypass circuit which is interposed a solenoid valve (40) (41) opened and closed by an external electric signal An emergency valve device characterized by the fact that. The emergency valve device according to claim 1, which has a water pressure gauge (42) of the water main (S) and opens and closes the solenoid valve (40) by a detection signal of the water pressure gauge (42). A solenoid valve (29) is provided in the pilot pipe (25), and the solenoid valve (29) interposed in the pilot pipe (25) is opened / closed by the detection signal of the water pressure gauge (42). The emergency valve device according to claim 2 , wherein the emergency valve (V) can be opened and closed via the pilot pipes (25, 26). The bypass circuit (41) is performed by a communication signal from a distant operation room instead of the detection signal of the water pressure gauge (42), or by a communication signal from a distant operation room in combination with the detection signal of the water pressure gauge (42). The emergency valve device according to claim 2 or 3, wherein one or both of the solenoid valve (40) and the solenoid valve (29) provided in the pilot tube (25) are opened and closed.

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