JP2003227150A - Supplying method and supplying equipment of tap water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To securely change over a supply system of tap water from a normal state to an emergency state in a simple device, in the case that tap water is made to flow in a water main pipe without flowing in a water reservoir at an emergency like an earthquake, although tap water flows through the reservoir in a normal state in a condition that the water reservoir installed near a tap water main pipe and the tap water main pipe are connected by an inflow pipe and an outflow pipe. <P>SOLUTION: An emergency actuation valve is attached to one of a tap water main pipe, an inflow pipe, and an outflow pipe, an air cylinder charged with a compressed gas is provided near to the emergency actuation valve. In a normal state, compressed air acts on the emergency actuation valve so that the emergency actuation valve retains a normal state, and in an emergency, the compressed gas changes the motion of the emergency actuation valve so that the emergency actuation valve works to retain the emergency state. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a facility for supplying tap water.

[0002]

2. Description of the Related Art Water is an essential part of human daily life. Therefore, if the water pipe is damaged due to an earthquake or other disaster, a water tank will be installed in a public land such as a school or a park in order to supply water for daily life. In this case, there is a plan to supply this water as domestic water.

If tap water is left as it is stored in a water tank, it will be decomposed and contaminated and cannot be used as domestic water. Therefore, the water stored in the water tank must be constantly circulated. For this reason, the water tank is connected to a water pipe passing by the water tank so that the water in the water tank always circulates. That is, the water tank is connected to the water main by the inflow pipe and the outflow pipe, and the tap water passing through the water main always flows into the water tank from the inflow pipe at the same time as it flows out from the outflow pipe. The water inside is constantly updated.

At the occurrence of an earthquake, the mains of the water is damaged, so that sewage flows into the mains of the water, and the water stored in the water tank may be contaminated by the sewage.
Therefore, in preparation for such a case, the inflow pipe and the outflow pipe connecting between the water main and the water storage tank are closed to prevent the water flowing through the water main from flowing into the water storage tank. There is a need. Attempts for this are also known.

One of the attempts is to attach a two-way valve to each of the water main pipe, the inflow pipe, and the outflow pipe. In detail, the attempt is as shown in FIG.
As shown in a model in Fig. 2, a two-way valve is attached to each of the inflow pipe 3 and the outflow pipe 4 which connect between the water main 1 and the water tank 2, and these valves are used for emergency. It is said that the shutoff valves P and Q are provided, and a two-way valve is attached to the main water pipe portion between the inflow pipe 3 and the outflow pipe 4 to form the emergency opening valve R. In this attempt, when an earthquake occurs, the emergency shutoff valves P and Q are closed and the emergency open valve R is opened so that tap water does not flow from the water main 1 into the water tank 2. Such an attempt has been made, for example, in Jikkou Sho 62.
No. 11814.

Another attempt to prevent tap water from flowing into the water tank in an emergency is to attach a four-way valve across the inflow pipe and the outflow pipe. More specifically, this attempt has a piping configuration as schematically shown in FIG. 2, in which the water mains 1 and 11 are cut off and an inflow pipe and an outflow pipe are connected thereto. A four-way valve S is additionally provided and extends over the inflow pipe and the outflow pipe.

In the piping configuration shown in FIG. 2, in normal condition, tap water passes from the water main 1 through the inflow pipe 3, enters through the inlet A of the four-way valve S, exits through the outlet D, and passes through the inflow pipe 3 '. Then, it enters the water tank 2, and the water in the water tank 2 passes through the outflow pipe 4 ',
The four-way valve S enters the inlet C, exits from the outlet B, and flows into the water main 11 through the outflow pipe 4. In this way, the water in the water tank 2 is updated.

In the piping structure shown in FIG. 2, the four-way valve S is activated and the outlet D and the inlet C are closed in an emergency. As a result, the tap water from the water main 1 flows into the four-way valve S through the inflow pipe 3, but the inflow water flows from the outlet B of the four-way valve S through the outflow pipe 4 to the water main 11. Will be done. In this way, tap water does not flow into the water tank 2. Such a proposal is described in, for example, Japanese Patent No. 2607527.

According to the piping configuration shown in FIGS. 1 and 2, if the emergency operating valve attached thereto operates as described, the water in the water tank is renewed and an emergency such as an earthquake occurs. Occasionally, household water will be secured. However, in the proposals so far, there is a problem in the mechanism for operating the emergency operation valve in these piping configurations.

For example, in Japanese Utility Model Publication No. 62-11814, the pressure difference of tap water is used to operate the emergency shutoff valve P or Q in FIG. 1, but the pressure difference of tap water is used. Due to its complicated structure, there are many failures, and it is not guaranteed to operate reliably in an emergency. This is because in order to operate the emergency operation valve P, it is necessary to use an operating device including the pilot valves 9 and 9'and the main valve 10 having a spring as shown in FIG. This is because, especially in the main valve 10, the spring is always immersed in water, so that the spring is corroded and does not work in an emergency. Furthermore, since the tap water pressure difference is used, tap water cannot be used. This is because it will not be able to operate if no longer flows.

Further, in Japanese Patent No. 2607527, which uses a four-way valve, an electromagnetic solenoid detects an abnormal signal of water pressure and releases a lock device, whereby the arm can be rotated and the arm is rotated. It is described that the weight is rotated to rotate the valve shaft of the four-way valve. However, since electricity is required to use the electromagnetic solenoid, considering that there is a power outage during an earthquake, this method does not work in an emergency,
There is a problem.

[0012]

In view of the above-mentioned circumstances, the inventor of the present invention automatically and reliably operates the emergency operation valve, that is, the above-described two-way valve or four-way valve in an emergency. In order to do that, I felt the need to devise another mechanism. The present invention was born in response to such a need.

[0013]

The inventor has found that as a means for solving the above-mentioned problems, it is suitable to use the pressure of the gas stored in the cylinder as a driving force. That is, for example, a cylinder storing pressurized air or nitrogen is prepared, and normally, the pressurized gas of the cylinder always works on the emergency operation valve to keep the tap water in the normal flow, and flows through the water main. It has been found that when the pressure of tap water drops below a certain set point, it is suitable for the pressurized gas in the cylinder to open and close the emergency actuating valve to turn tap water into an emergency flow. Moreover, it was confirmed that even if the pressurized gas of the cylinder is always acted on the emergency actuation valve in both normal and emergency situations, the pressurized gas of the cylinder does not disappear so much unless the emergency actuation valve is opened and closed. The present invention has been completed based on such knowledge.

The present invention provides a method for supplying tap water by pressurized gas and equipment therefor, which is provided for the above-mentioned unforeseen cases. That is, the present invention provides a method for supplying tap water in one aspect, and provides a facility for supplying tap water in another aspect.

In the tap water supply method according to the present invention, a water storage tank is provided beside the water supply main for supplying tap water, and the water supply main and the water storage tank are connected by an inflow pipe and an outflow pipe. Attach an emergency valve to any of the water mains, inflow pipes and outflow pipes,
In the tap water supply method in which the tap water flowing in the mains of the water is allowed to flow through the water storage tank under normal conditions and the tap water is allowed to flow without passing through the water tank during an emergency, pressurized gas is supplied near the emergency operation valve. The stored cylinder is installed, the actuator is attached to the emergency valve, and while the pressure of the tap water flowing through the mains is above the set value, pressurized gas from the cylinder is put into one side of the actuator for emergency operation. When the pressure of tap water flowing through the water main falls below the set value, the pressurized valve from the cylinder is put into the other side of the actuator to maintain the normal flow of the tap water in the operating valve, and the emergency valve To activate
It is characterized by changing to the flow of tap water in the case of an emergency.

Further, the tap water supply facility provided by the present invention is provided with a water storage tank beside the water supply main for supplying tap water, and an inflow pipe and an outflow pipe are provided between the water supply main and the water storage tank. Connect and attach an emergency valve to any of the water mains, inflow pipes, and outflow pipes. In normal times, tap water flowing through the water mains flows through the water storage tank, and in an emergency, tap water does not pass through the water storage tank. In the tap water supply facility that was made to flow with, a cylinder storing pressurized gas is installed near the emergency operation valve, an actuator is attached to the emergency operation valve, and pressurized gas is provided between the cylinder and the actuator. A ventilation pipe for feeding is attached, and the ventilation pipe branches through the control valve and is connected to at least two places of the actuator, and the control valve can change the passage as the pressure of tap water flowing in the water main changes. Open or close the vent pipe It is characterized in that it has kill manner.

The control valve for selecting the ventilation pipe according to the pressure of the tap water preferably includes a tap water pressure sensing unit and a gas passage changing unit. It is preferable that the pressure sensing unit includes a diaphragm that changes its shape depending on the pressure of tap water, for example, a diaphragm that expands, and the passage changing unit changes the fluid passage by moving a shaft attached to the diaphragm.

Further, it is preferable that the passage changing portion sends the pressurized gas to the ventilation pipe on the one hand and releases the pressurized gas stored in the other ventilation pipe to the atmosphere on the other hand.
In this respect, it is preferable that the passage changing portion has a structure which can be said to be a kind of four-way valve.

An example of the present invention will be described below with reference to the drawings. FIGS. 4 and 5 schematically show the tap water supply equipment of the present invention when a two-way valve is used as an emergency operation valve, of which
FIG. 4 shows a normal state, and FIG. 5 shows an emergency state. 6 and 7 schematically show the tap water supply equipment of the present invention when a four-way valve is used as an emergency valve, of which FIG. 6 shows a normal state. FIG. 7 shows an emergency state. 8 and 9 schematically show the tap water supply equipment of the present invention when a three-way valve is used as an emergency valve, of which FIG. 8 shows a normal state. 9 shows an emergency state. FIG. 10 is a sectional view of a three-way valve that can be used in the present invention.

The equipment according to the present invention shown in FIG. 4 is constructed as follows. The main water pipe 1 is cut in the middle and connected to a water storage tank 2 by an inflow pipe 3, and the water storage tank 2 is connected to a water main pipe 11 by an outflow pipe 4. Thus, tap water from the water main 1 enters the water tank 2 through the inflow pipe 3 and flows into the water main 11 through the outflow pipe 4. This is the normal tap water flow.

4 and 5 in order to provide an emergency flow.
In this case, an emergency shutoff valve P is attached to the inflow pipe 3 side, and an emergency shutoff valve Q is attached to the outflow pipe 4 side. The emergency shutoff valves P and Q are both two-way valves and are a kind of emergency actuating valve.

When the emergency shutoff valves P and Q are activated to close the flow of tap water, the bypass pipe 20 having the same diameter as the water main pipe 1 is used to flow the tap water from the water main pipe 1 to 11. Main 1
It is attached between 1 and 11. In the bypass pipe 20,
It consists of a two-way valve and is equipped with an emergency opening valve R, which is a kind of emergency operating valve. The tap water supply facility thus created is the same as the facility schematically shown in FIG. In addition,
A two-way valve that can be used here is, for example,
It has a structure as shown in FIG.

In the equipment shown in FIG. 4, the emergency operating valve P,
A cylinder X storing pressurized gas is installed near Q and R. An inert gas is preferably used as the pressurized gas, but a harmless gas such as air or nitrogen is preferably used. It may also be carbon dioxide. The cylinder X is connected to the control valve Y by a ventilation pipe 60.

The control valve Y includes a tap water pressure sensing unit 71 and a gas passage changing unit 72. The pressure sensing unit 71 includes a diaphragm 73, and the diaphragm 73 is in contact with tap water introduced from a thin pipe 70 attached between the water mains 1 and 11. Therefore, the diaphragm 73 is inflated while the tap water pressure is high. However, when the water pressure decreases, the diaphragm 73 contracts, and the diaphragm 7
When 3 is contracted, the shaft attached to diaphragm 73 moves and the passage in passage changing portion 72 is changed.

Therefore, while the tap water pressure is above a certain set value, for example, the passage changing portion 72 is in a state as shown in a model in the right half portion, and the ventilation pipe 60 and the first communicating portion are connected. Trachea 4
0 will be communicated. However, when the pressure of the tap water drops below the set value, the passage changing unit 72 is in a state as schematically shown in the left half, and as shown in FIG.
The ventilation pipe 60 is blocked from the first ventilation pipe 40 and communicates with the second ventilation pipe 50.

In the equipment shown in FIG. 4, the emergency shutoff valves P and Q are provided.
Piston type actuators 31, 32 and 33 are attached to the and emergency release valve R, respectively. In these actuators, one side of each piston is a ventilation pipe 41,
42, 43, but these ventilation pipes 41, 4
2 and 43 are connected to one first ventilation pipe 40 having the same tip. Therefore, the pressurized gas introduced into the first ventilation pipe 40 simultaneously actuates the actuators 31, 32, 33 in the same manner.

Further, the actuators 31, 32, 33
The other side of each piston is a ventilation pipe 51, 52, 5
3 and these vent pipes are also the same one second
It is connected to the ventilation pipe 50. The second ventilation pipe 50 is connected to the control valve Y. Therefore, when the pressurized gas is introduced into the second ventilation pipe 50, the actuators 31, 32 and 33 operate in the same direction in the opposite direction to the previous one.

FIG. 4 shows a normal state of the water supply equipment according to the present invention. That is, it shows a state in which the pressure of the tap water flowing through the water main is equal to or higher than a set value. At this time, the control valve Y is in a state where the passage changing portion 72 is in the right half portion, and the ventilation pipe 60 is in the first ventilation pipe
Although it is in communication with 0, it is blocked from the second ventilation pipe 50. At this time, the second ventilation pipe 50 has the passage changing portion 72.
Is in a state in which the gas in the second ventilation pipe 50 can be released into the atmosphere by communicating with the atmosphere. Therefore, in FIG. 4, the pressurized gas sent from the cylinder is divided into the ventilation pipes 41, 42, 43 from the first ventilation pipe 40 and enters the actuators 31, 32, 33, respectively, and the piston is moved in the direction of arrow 7, that is, It pushes in the direction away from the ventilation pipes 41, 42, 43. Therefore, the emergency shutoff valves P and Q are maintained in the open state, and the emergency open valve R is maintained in the closed state.

FIG. 5 shows an emergency state of the water supply equipment according to the present invention shown in FIG. That is, it shows a state in which the pressure of tap water flowing through the water main is lower than a set value. At this time, the control valve Y includes the pressure sensing unit 71.
The diaphragm 73 contracts and the shaft attached to the diaphragm 73 moves, so that the passage changing portion 72 is in a state as schematically shown in the left half portion.

As shown in FIG. 5, when the passage changing portion 72 of the control valve Y is in the state shown in the left half, the ventilation pipe 60 communicates with the second ventilation pipe 50 and the first ventilation pipe 40 is exposed to the atmosphere. Will lead to. Therefore, the pressurized gas from the cylinder X passes from the ventilation pipe 60 through the second ventilation pipe 50, and then the ventilation pipe 51,
Actuators 31, 3 via 52, 53 respectively
2,33. Therefore, each actuator 3
The pistons in 1, 32, 33 are vent pipes 51, 52, 5
It is pushed in the direction away from 3. In this way, the emergency shutoff valves P and Q are shut off, and the emergency open valve R is opened.

As a result, the tap water flowing through the water main 1 is
Instead of passing through the water tank 2, it flows through the bypass pipe 20 to the water main 11. This is the flow of tap water in an emergency.

Next, the case where a four-way valve is used as the emergency operating valve will be described with reference to FIGS. 6 and 7. The equipment shown in FIG. 6 and FIG. 7 includes water mains 1 and 11 and a water tank 2.
Are connected by an inflow pipe 3 and an outflow pipe 4, and a four-way valve S is attached across the inflow pipe 3 and the outflow pipe 4. This state is the same as the state shown in FIG. In addition,
As the four-way valve, the one shown in FIG. 3 of JP-A No. 11-304021 can be used.

In the equipment shown in FIGS. 6 and 7, as in the equipment shown in FIGS. 4 and 5, it is assumed that the pressurized gas from the cylinder X enters the control valve Y via the ventilation pipe 60. ing.
The control valve Y is the same as that described with reference to FIGS. 4 and 5, and includes a pressure sensing unit 71 and a passage changing unit 72. When the control valve Y is normal, as shown in FIG.
The passage changing unit 72 is in the communication state as shown in the right half portion, and in an emergency, as shown in FIG. 7, the passage changing unit 72 is in the communication state as shown in the left half portion. Therefore, the pressurized gas flows as described below.

At normal times, as shown in FIG. 6, the cylinder X
Since the pressurized gas from the above enters the control valve Y via the ventilation pipe 60 and enters one side of the actuator 31 via the first ventilation pipe 40, the piston of the actuator 31 is in a state as shown in FIG. It has become. When the actuator 31 is in this state, the four-way valve S causes the tap water from the water main 1 to flow into the inflow pipe 3, and the water in the outflow pipe 4 to flow into the water main 11. Therefore, the tap water from the water main 1 flows into the water main 11 via the water tank 2 and is in a normal state.

When the pressure of the tap water falls below the set value, and therefore the water pressure entering the pressure sensing portion 71 of the control valve Y falls, the passage changing portion 72 of the control valve Y shifts to the communication state shown in the left half portion, The state of FIG. 6 changes to the state of FIG. In FIG. 7, the pressurized gas from the cylinder X enters the control valve Y through the ventilation pipe 60, passes through the second ventilation pipe 50 here, and is introduced into the actuator 31. Therefore, actuator 3
The first piston is pushed in a direction away from the second ventilation pipe 50 as shown in FIG. 7.

When the piston of the actuator 31 is pushed in the direction away from the second ventilation pipe 50, the four-way valve S connects the main water pipes to each other, and the tap water does not flow to the inflow pipe 3 and the outflow pipe 4. Therefore, the tap water from the water main 1 does not pass through the water tank 2, but flows from the water main 1 to 11 via the four-way valve S. In this way, an emergency flow is realized.

It is not known to use a three-way valve for flowing the tap water flowing through the mains into the water tank. However, the present invention can be implemented by using a three-way valve as well as a two-way valve and a four-way valve, and therefore the embodiment of the present invention using a three-way valve will be described below with reference to FIGS. 8 and 9. It will be described with reference to.

In the equipment shown in FIG. 8 and FIG. 9, the water mains 1 and 11 and the water storage tank 2 are connected by the inflow pipe 3 and the outflow pipe 4, and their connecting portions are three-way ports. Valves T and U
And are attached. As the three-way valve in this case, the one having the structure shown in FIG. 10 can be used.
The three-way valve itself having such a structure is well known, and is disclosed in, for example, Japanese Patent No. 2984543 as FIG.

In the equipment shown in FIGS. 8 and 9, as in the equipment shown in FIGS. 4 to 7, the pressurized gas from the cylinder X is introduced into the control valve Y via the ventilation pipe 60. It The control valve Y is the same as that described with reference to FIGS. 4 to 7, and in the normal state, as shown in FIG. 8, the passage changing portion 72 is in the communication state as shown in the right half portion, The gas flowing through the ventilation pipe 60 is caused to flow through the first ventilation pipe 40, but in an emergency, the gas flowing through the ventilation pipe 60 is caused to flow through the second ventilation pipe 50.

Therefore, the actuator 31 is normally operated.
As shown in FIG. 8, both pistons in
It is pushed in a direction away from the inlet of the ventilation pipe 40. At this time, the three-way valve T causes the water in the water main 1 to flow into the inflow pipe 3, and the three-way valve U causes the water in the outflow pipe 4 to flow into the water main 11. For this reason, tap water in normal condition is stored in the water tank 2.
The condition of flowing through is maintained.

On the other hand, in the event of an emergency, the pistons in the actuators 31 and 32 are both in the second position as shown in FIG.
It is pushed in a direction away from the ventilation pipe 50. At this time, the valve bodies of both the three-way valves T and U rotate, the bypass pipes 20 communicate the water mains with each other, and the water mains and the inflow pipe 3 or the outflow pipe 4 are shut off from each other. Therefore, the tap water flowing through the water main will not enter the water tank 2.

[0042]

According to the method and facility for supplying tap water according to the present invention, when the emergency valve is operated, a drop in the water pressure of the tap water is detected and used as a motive to store it in a cylinder as a driving force. Since the pressurized gas thus obtained is used, the emergency valve can be operated easily and reliably even in the event of an accident such as a power failure. Moreover, since the pressurized gas is stored in the cylinder, the pressurized gas does not disappear so much as it does not leak unless the gas leaks from the actuator. Therefore, the pressurized gas stored in the cylinder can be used for a long time, and the labor for maintenance and inspection can be saved.

Particularly when air, nitrogen or the like is used as the pressurized gas, there is no danger even if it is released, and the environment is not polluted, which is preferable.

Further, in the device according to the present invention, in order to operate the emergency operation valve, the ventilation pipe is attached to send the pressurized gas from the cylinder to the actuator attached to the emergency operation valve, and the ventilation pipe is controlled. Since the valve is provided and the branched ventilation pipe is connected to at least two places of the actuator, it is possible to operate the emergency operation valve by using the branched ventilation pipe separately for normal time and emergency. Therefore, both the normal state and the emergency state can be reliably maintained by the pressurized gas, and the transition from the normal state to the emergency state can be performed easily and surely. In addition, the control valve can change the passage and open or close the ventilation pipe according to the change in the pressure of the tap water flowing in the main water, so that it automatically changes with the decrease of tap water. It is possible to change from the normal state to the emergency state by changing the ventilation pipe that sends the pressurized gas.

Further, in this equipment, since it is not necessary to use a spring for the emergency operation valve, there is no risk of the equipment being rusted or corroded, and therefore it can be used for a long time. The present invention provides such various benefits.

When the two-way valve is used as the emergency operation valve, it is necessary to additionally install three two-way valves as tap water supply equipment as a whole. On the other hand, when using a four-way valve as an emergency valve, it is sufficient to install only one four-way valve in the entire supply facility. Also, when using a three-way valve as an emergency operating valve, two three-way valves must be used for the entire supply equipment. The use of four-way valves appears to be advantageous only in terms of the number of emergency actuation valves required, but four-way valves are complex and expensive in construction, and three-way valves are second only to this, while two-way valves are Since the direction valve is simple in structure and cheap in price, which is advantageous depends on time and place.

[Brief description of drawings]

FIG. 1 shows a model of conventional tap water supply equipment.

FIG. 2 schematically shows another conventional tap water supply facility.

FIG. 3 is a state diagram at the time of water flow showing an operation mechanism of an emergency operation valve used in a conventional tap water supply facility.

FIG. 4 is a model diagram showing a normal state of the tap water supply facility according to the present invention.

FIG. 5 is a model diagram showing an emergency state of the tap water supply facility shown in FIG.

FIG. 6 is a model diagram showing a normal state of another tap water supply facility according to the present invention.

FIG. 7 is a model diagram showing an emergency state of the tap water supply facility shown in FIG.

FIG. 8 is a model diagram showing a normal state of still another tap water supply facility according to the present invention.

FIG. 9 is a model diagram showing an emergency state of the tap water supply facility shown in FIG.

FIG. 10 is a sectional view of a three-way valve that can be used in the present invention.

[Explanation of symbols]

1, 11 Water main 2 water tank 3,3 'inflow pipe 4, 4'outflow pipe 7 arrows 9, 9'pilot valve 10 Main valve 20 Bypass pipe 31, 32, 33 actuator 40 First ventilation pipe 41, 42, 43 Vent pipe 50 Second ventilation pipe 51, 52, 53, 60 Vent pipe 70 thin tube 71 Pressure sensor 72 Passage change section 73 diaphragm P, Q emergency shutoff valve R emergency release valve S four-way valve T, U three-way valve X cylinder Y control valve

Claims (3)

[Claims] 1. A water tank is provided beside a water main for supplying tap water, the water main and the water tank are connected by an inflow pipe and an outflow pipe, and a water main, an inflow pipe, and an outflow pipe are provided. In any of the above, a method of supplying tap water, in which an emergency valve is attached, the tap water flowing through the mains of the water in a normal state flows through the water tank, and in an emergency, the tap water is allowed to flow without passing through the water tank. A cylinder that stores pressurized gas is installed near the emergency operation valve, an actuator is attached to the emergency operation valve, and the pressure from the cylinder is applied while the pressure of tap water flowing through the water main is above a set value. Put gas into one side of the actuator, and let the emergency valve maintain the normal flow of tap water.When the pressure of tap water flowing through the water main falls below the set value, pressurize the gas from the cylinder. Put it on the other side of the actuator to activate the emergency valve, A method of supplying tap water, characterized by changing to the flow of tap water in an emergency. 2. A water tank is provided beside a water main for supplying tap water, the water main and the water tank are connected by an inflow pipe and an outflow pipe, and a water main, an inflow pipe, and an outflow pipe are provided. In the tap water supply equipment, which is equipped with an emergency operation valve in any of the above, flows the tap water flowing through the water mains through the water tank in the normal state, and allows the tap water to flow without passing through the water tank in an emergency, A cylinder storing pressurized gas is installed near the emergency operation valve, an actuator is attached to the emergency operation valve, and a ventilation pipe for sending pressurized gas is attached between the cylinder and the actuator. The control valve is branched through and connected to at least two places of the actuator so that the control valve can change the passage to open or close the ventilation pipe according to the change of the pressure of the tap water flowing in the main water. Supply of tap water, which is characterized by Supply facility. 3. The control valve comprises a pressure sensing part for tap water and a flow path changing part for pressurizing gas, and the pressure sensing part includes a diaphragm and is deformed by water pressure. The tap water supply facility according to claim 2, wherein the gas flow path is changed.