JP3087557B2 - Bath drop-off valve for hot water supply - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention intervenes between a hot water supply channel from a hot water supply device and a bath additional heating circuit, and drops water from the hot water supply channel into the bath additional heating circuit and non-hot water supply. The present invention relates to a bath dropping hot water supply cutoff valve device that sometimes separates the water on the hot water supply path side and the water on the bath additional heating circulation path side.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional type of such a gate dropping device for hot water supply. This device will be described. Reference numeral 10 denotes a bath heat-up heat exchange can body, and a bath heat-up circulation circuit 30 including a bath return pipe 31 and a bath going pipe 32 is connected to the can body 10. The bathtub water is driven by the circulation pump 41 to enter the bath heat-up canister 10 from the bath return pipe 31, is heated, and circulates through the bath pipe 32 to the bathtub. In addition to the circulation pump 41, the bath return pipe 31 is provided with a water flow switch 42, a bath temperature sensor 43, and a bath water level sensor 44. A hot water supply path 51 for automatic hot water supply from a water heater (not shown) and a water supply path 52 as necessary are provided, and these are supplied to the circulation path 30
Connected to. The cutoff valve device 60 includes a hot water supply valve including a hot water supply solenoid valve 61a for opening and closing the passage of the hot water supply passage 51 and a water supply solenoid valve 61b for opening and closing the passage of the water supply passage 52, and a first check valve 62 provided downstream thereof. A second check valve 63 and a dropping hot water supply path 64 are provided downstream of the first check valve 62, and the first check valve 62 is pushed down, so that the upper opening is closed. An overflow chamber 65 is provided.
The 65 is provided with an overflow solenoid valve 66 and a drain solenoid valve 67. The dropped hot water supply path 64 is connected to the bath return pipe 31 of the reheating circuit 30 through a three-way switching valve 70.

[0003] Hot water is supplied to the bath tub through a controller 80 by a command from a remote controller or the like (not shown) via a controller 80.
a, if necessary, the water supply electromagnetic valve 61b is opened, and the three-way switching valve 70 connects the hot water supply path 64 and the bath return pipe 31 to connect the hot water supply path 51 and the hot water supply path 52 to the hot water supply valve 61a.
, 61b, the first check valve 62, the second check valve 63, the falling hot water supply passage 64, and the three-way switching valve 70 to enter the bath return pipe 31. The bath return pipe 31 is provided with a bypass path 31a for both transports and a check valve 31b provided in the bypass path 31a. Part of the hot water introduced into the bath return pipe 31 by the bypass passage 31a and the check valve 31b can be directly introduced into the bathtub from the bath return pipe 31 through the bypass passage 31a. A smooth bath hot water supply is performed by both transports in the outgoing pipe 32. The overflow solenoid valve 66 is opened when hot water supply is stopped, and releases air to the overflow chamber 65.
To the first check valve 62 side to cut off the continuity of the water flow and perform the edge cutting. The drain solenoid valve 67
Is the water that leaked during hot water supply and entered the overflow chamber 65,
This is a valve for draining water that has flowed back from the side of the bath additional circulation circuit 30 through the hot water supply path 64 and the second check valve 63 and has entered the overflow chamber 65.

[0004]

However, in the above-described apparatus, when the hot water supply is stopped, the first check valve is provided in the overflow chamber 65 provided independently of the hot water supply path. Water moves into the overflow chamber 65 as the valve 62 moves, and water replaced with air flows into the overflow chamber 65.
Since water flows into the overflow chamber 65, water easily accumulates in the overflow chamber 65. Therefore, the accumulated water must be drained to the bath reheating circuit 30 at an appropriate frequency. For this reason, in addition to the disadvantage that it takes time to drain the overflow chamber 65, a drain solenoid valve 67, a three-way switching valve 70, a bypass path 31a for both transports, and a check valve 31b are required, leading to an increase in cost. In addition, when the hot water supply flow rate is low, or when the bathtub is at a position lower than the gate valve device 60, the overflow of the overflow chamber 65 by the first check valve 62 becomes insufficient, and water enters the overflow chamber 65. However, there is a problem that the water becomes full and overflows outside. For this reason, the overflow solenoid valve 66 is required, leading to a further increase in cost. Further, for example, when the bath is installed at a location considerably lower than the gate valve device 60, the air from the gate valve device 60 side easily enters the bath reheating circuit 30 side due to the negative pressure, so that air entrainment occurs. Therefore, the three-way switching valve 70 is required because the noise of the circulating pump 41 is easily generated due to the above, and the detection of the bath water level by the bath water level sensor 44 becomes inaccurate.

Therefore, the present invention solves the above-mentioned drawbacks of the conventional apparatus and eliminates the need for draining water collected separately from hot water supply, so that no time is required for drainage and air is supplied from the hot water supply channel side. Mixed into the circulation path 30 for bath reheating,
Low-cost bath drop hot water supply that does not generate noise in the circulating pump or make the water level detection by the bath water level sensor inaccurate, and does not require the drain solenoid valve 67 or the three-way switching valve 70, etc. It is intended to provide a gate valve device.

[0006]

In order to achieve the above object, a gate valve device for dropping hot water of the present invention is provided between a hot water supply path from a water heater and a circulation path for hot water for bathing. In some cases, the water from the hot water supply path is dropped into the circulation circuit for bath reheating and the non-hot water supply, and the cutoff valve device for hot water supply for bathing is configured to separate the water on the side of the hot water supply path and the water on the circulation path for reheating bath. A hot water supply valve for opening a passage of the hot water supply path at the time of hot water supply, a first hot water supply check valve downstream of the hot water supply valve for preventing backflow of hot water supply, and the first hot water supply check valve A second hot-water supply check valve which is located below the hot-water supply and prevents a backflow of hot water, and an air charge chamber which is laterally connected to a passage between the first hot-water supply check valve and the second hot-water supply check valve. And an electromagnetic air that can open and close the air charge chamber. A charge valve, and a vacuum breaker is provided in the hot water supply path as a part of the cutoff valve device, and when the bathtub position is at a low place, the electromagnetic air charge valve is always closed to cut off the water flow by the vacuum breaker. The first feature is that when the bathtub is located at a high place, the water flow is cut off by controlling the opening and closing of the electromagnetic air charge valve. Further, in addition to the first feature of the present invention, the bath drop-off hot-water supply cutoff valve device of the present invention further includes a manual switching lever for always closing the electromagnetic air charge valve with respect to the electromagnetic air charge valve. This is a second feature. Further, the bath drop-off hot water supply cutoff valve device of the present invention is interposed between a hot water supply path from a water heater and a bath reheating circuit, and supplies hot water from the hot water supply path to the bath reheating circuit during hot water supply. A hot water supply cutoff valve device that cuts off the water on the hot water supply path side and the water on the hot water circulation circuit side when the hot water is not supplied, and opens the hot water supply path when hot water is supplied. A valve, a first hot water supply check valve downstream of the hot water supply valve for preventing backflow of hot water supply, and a second hot water supply below the first hot water supply check valve for preventing reverse flow of hot water supply A check valve,
And when the bathtub position is low, the vacuum breaker is connected to the hot water supply path as a part of the cutoff valve device, and when the bathtub position is high, the air having an electromagnetic air charge valve that is controlled to be opened and closed by a controller. A third feature is that a charge chamber is connected to a passage between the first and second hot water supply check valves.

[0007]

According to the first feature of the present invention, the electromagnetic air charge valve is always closed when the bathtub position is at a low position. Therefore, at the time of hot water supply, the hot water supply valve and the first hot water supply check are stopped. Hot water flowing through the valve and the second hot water check valve does not separate from the hot water supply passage and does not accumulate or overflow. When the hot water supply is stopped, a negative pressure is applied to the upstream side of the hot water supply path, so that air enters the hot water supply path from the vacuum breaker and the water flow is cut off. Since the electromagnetic air charge valve is always closed, even if the bathtub is placed at a low position, air can enter the bath reheating circuit even if negative pressure is generated on the bath reheating circuit. Absent. On the other hand, when the bathtub is located in a high place, the water flow is cut off by controlling the opening and closing of the electromagnetic air charge valve, so the electromagnetic air charge valve is closed when hot water is supplied, and the electromagnetic air charge valve is opened when hot water is not supplied. By doing so, it is possible to prevent hot water from overflowing to the outside through the electromagnetic air charge valve during hot water supply, and to open the electromagnetic air charge valve when hot water supply is stopped. Air enters the passage between the first hot water check valve and the second hot water check valve through the electromagnetic air charge valve to cut off the water flow. When the hot water is not supplied, the electromagnetic air charge valve is open. However, since the position of the bathtub is high, no negative pressure is applied from the bath additional heating circulation circuit, and air does not enter from the gate valve device side.
Water flowing through the first hot-water supply check valve at the beginning of hot water supply or when the hot-water supply is stopped tends to flow to the second hot-water supply check valve below the hot water supply check valve, and excessively enters the side air charge chamber. In addition, a small amount of water accumulated in the air charge chamber flows away to the bath reheating circuit along with hot water at the next hot water supply, so that water does not accumulate in the air charge chamber. Therefore, there is no need for special drainage.

According to the second aspect, in addition to the operation of the first aspect, a manual switching lever for always closing the electromagnetic air charge valve is provided for the electromagnetic air charge valve. Therefore, when the bathtub is in a low position, the electromagnetic air charge valve can be easily closed by a manual switching lever. The manual switching operation may be performed only once after installing the bathtub.

According to the third feature, when the bathtub is located at a low position, a vacuum breaker is connected to the hot water supply path as a part of the gate valve device, and an air charge chamber with an air charge valve is provided. No hot water is supplied during the hot water supply without overflow, and when the hot water supply ends, the upstream side of the hot water supply path becomes negative pressure, so that the air enters the hot water supply path from the vacuum breaker and the water flow is cut off. . On the other hand, when the bathtub is located at a high place, no vacuum breaker is provided, and an air charge chamber having an electromagnetic air charge valve controlled to be opened and closed by a controller is provided between the first and second hot water supply check valves. Connected to. When supplying hot water, close the electromagnetic air charge valve,
Also, by opening the electromagnetic air charge valve when hot water is not supplied, hot water is prevented from overflowing to the outside through the electromagnetic air charge valve when hot water is supplied, and when hot water supply is stopped, electromagnetic air charge is stopped. When the valve is opened, air from the outside enters the passage between the first hot water check valve and the second hot water check valve through the electromagnetic air charge valve, and the water flow is cut off. When the hot water is not supplied, the electromagnetic air charge valve is open. However, since the position of the bathtub is high, no negative pressure is applied from the bath additional heating circulation circuit, and air does not enter from the gate valve device side. Similarly to the operation of the first feature, the water flowing in through the first hot water supply check valve at the beginning of hot water supply or when the hot water supply is stopped is directed to the second hot water supply check valve below the same. Easy to flow,
Not much enters the side air charge chamber, and a small amount of water that has accumulated in the air charge chamber flows off to the bath reheating circuit along with hot water at the next hot water supply,
No water accumulates in the air charge chamber. Therefore, there is no need for special drainage. Of course, when the air charge chamber is not provided, no water accumulates in the gate valve device, so that there is no need for drainage.

[0010]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention, FIG. 2 is a cross-sectional view showing details of a gate valve device, FIG. 3 is a cross-sectional view showing another embodiment of a gate valve device, and FIG. FIG. 7 is a cross-sectional view of a gate valve device for explaining another embodiment of the present invention.

In FIG. 1, a bath return pipe 31 from the bathtub 20 to the heat exchanger can 10 for bath heating and a bath follower 32 comprising a heat exchanger tube 32 from the heat exchange can body 10 for bath heating to the bathtub 20. A firing circuit 30 is provided. Bath return pipe 31
Has a circulation pump 41, water flow switch 42, bath temperature sensor 4
3. A bath water level sensor 44, which is a pressure sensor, is provided. A hot water supply path 51 for automatic hot water supply from the water heater 100 is connected to the gate valve device 90. The water supply can be connected to the gate valve device 90 as needed.

Referring also to FIG. 2, the gate valve device 90 is provided with a hot water supply solenoid valve 91 for opening and closing the passage of the hot water supply passage 51, and a first hot water supply check valve 92 biased by a spring 92a downstream thereof. A second hot water supply check valve 95 urged by a spring 95a is provided below the first hot water supply check valve 92. An air charge chamber 93 is connected to the hot water supply passage between the first hot water check valve 92 and the second hot water check valve 95 from the side. The hot water supply electromagnetic valve 91 is a valve using a diaphragm 91a. The air charge chamber 93 is provided with an air charge port 93a at the ceiling thereof.
Is provided. The electromagnetic air charge valve 96 is located in the air charge chamber 93 and has the air charge port 93a.
Is configured to be closed from the inside. 97 is an overflow port. Further, in the gate valve device 90, a vacuum breaker 99 is provided in the hot water supply passage 51 before the hot water supply electromagnetic valve 91. The controller 80 performs predetermined control of the gate valve device 90, the circulation pump 41, and the like based on input of signals from sensors, a remote controller (not shown), and the like.
In FIG. 2, the left side of the central axis X ₁ represents a state at the time of non-hot-water supply, the right side shows a state at the time of hot water. The left side of the central axis X ₂ represents a case where the solenoid air charge valve 96 is in the open state, the right side shows a state that closes the air charge port 93a.

The electromagnetic air charge valve 96 always closes the air charge port 93a when the bathtub 20 is located at a low position. That is, the electromagnetic air charge valve 96 is not used, and the vacuum breaker 99 operates. On the other hand, when the bathtub 20 is located at a high position, the electromagnetic air charge valve 96 is opened and closed. In this opening / closing operation, for example, the controller 80 forcibly closes the air charge port 93a at the time of hot water supply, and releases the forced closing of the air charge port 93a at the time of non-hot water supply so that the air charge port 93a is opened. When the bathtub 20 is located in a low place,
For example, the bathtub 20 may be lower with the position lower than the gate valve device 90. In addition, according to the standards of the Japan Water Works Association, the overflow surface of the bathtub 20 can be determined to be low when the overflow surface is lower than the vacuum breaker 99 by a certain amount or more. The case where the bathtub 20 is located at a high position is a case where the bathtub 20 is located at a position opposite to the position where the bathtub 20 is at a low position. Whether the position of the bathtub 20 is in a low place may be determined by the installer of the apparatus after installing the bathtub, or automatically detected by the bath water level sensor 44 which is a pressure sensor after the installation of the apparatus. You can also do so. And, when it is in a low place, the electromagnetic air charge valve 96 may be forcibly manually closed by the installer, or the electromagnetic air charge valve 96 may be forcibly closed via the controller 80. You may make it.

When the electromagnetic air charge valve 96 is manually closed, for example, as shown in FIG. 3, a switching lever 110 is provided, and by turning the switching lever 110, the electromagnetic air charge valve 96 is set in the case. The action portion 111 of the switching lever 110 which contacts the tip of the solenoid valve forcibly pushes up the electromagnetic air charge valve 96 to close the air charge port 93a.

When the hot water supply is started in a case where the bathtub 20 is at a low position and the electromagnetic air charge valve 96 is forcibly closed, the controller 80 operates the hot water supply electromagnetic valve.
Release 91. This makes the hot water supply channel 51 directly connected to the water supply, etc.
Hot water from the hot water supply solenoid valve 91 opened into the gate valve device 90 at high pressure, through the first hot water supply check valve 92,
It falls downward, flows through the second hot-water check valve 95, flows into the bath reheating circuit 30, and is introduced into the bathtub through both the return pipe 31 and the forward pipe 32. Hot water does not overflow from the air charge chamber 93 during hot water supply. Next, when bath water supply of a predetermined amount is completed, controller 80 closes hot water supply electromagnetic valve 91. When the hot water supply path 51 becomes negative pressure due to the stop of hot water supply, the vacuum breaker 99 operates and the outside air is supplied to the hot water supply path 51.
The water flow is cut off. Even if the bath tub 20 is at a lower position and the bath reheating circuit 30 has a negative pressure tendency, the air enters the bath reheating circuit 30 because the electromagnetic air charge valve 96 is closed. Is prevented. Further, at the end of hot water supply, the water flowing downward from the first hot water supply check valve 92 and the water in the air charge chamber 93 flow downward to the second hot water supply check valve 95, and the second while the water pressure is present, the second The water flows through the hot-water check valve 95 to the bath reheating circuit 30. Therefore, water hardly accumulates in the air charge chamber 93. Therefore, it is unnecessary to drain the water in the air charge chamber 93. Of course, the water remaining upstream of the second hot-water supply check valve 95 flows out together with the next hot-water supply, so that the accumulated water amount does not gradually accumulate.

Next, when the bathtub 20 is located at a high position, the controller 80 controls opening and closing of the electromagnetic air charge valve 96 during hot water supply and non-hot water supply. That is, the electromagnetic air charge valve 96 is opened to cut off the water flow when hot water is not supplied, and is closed so that hot water does not overflow when hot water is supplied. When hot water supply is started, controller 80 opens hot water supply electromagnetic valve 91. As a result, the hot water from the hot water supply path 51 directly connected to the water supply or the like enters the gate valve device 90 at high pressure from the opened hot water supply electromagnetic valve 91, passes through the first hot water supply check valve 92, and falls downward. And further flows into the bath reheating circuit 30 through the second hot water check valve 95,
It is introduced into the bathtub 20 through both the return pipe 31 and the outgoing pipe 32. Since the electromagnetic air charge valve 96 is closed during hot water supply, hot water does not overflow from the air charge chamber 93. Next, when a predetermined amount of hot water is supplied, the controller 80 closes the hot water supply electromagnetic valve 91 and opens the electromagnetic air charge valve 96. . If the upstream side of the hot water supply path 51 becomes negative pressure due to the stop of hot water supply, the vacuum breaker 99 operates, and the outside air enters the hot water supply path 51 to cut off the water flow. When the hot water is not supplied, the forcible force on the electromagnetic air charge valve 96 is released, so the electromagnetic air charge valve 96 opens the air charge port 93a by its own weight. When the air charge port 93a is opened, air enters the hot water supply passage between the first hot water check valve 92 and the second hot water check valve 95 from the air charge port 93a to cut off the water flow. When the bathtub 20 is located at a high position, bathtub water is likely to enter the gate valve device 90 side, but is prevented by the second hot water check valve 95, overflows from the air charge chamber 93, and The first hot-water supply check valve 92 is also prevented from entering the hot-water supply path 51 side.

In the embodiment described above, both the electromagnetic air charge valve 96 and the vacuum breaker 99 are provided, but the electromagnetic air charge valve 96 is provided in accordance with the bathtub position.
Alternatively, only one of the vacuum breakers 99 can be provided. That is, when the bathtub 20 is located at a low position, the vacuum breaker 99 is connected to the hot water supply path 51 as a part of the gate valve device 90, and when the bathtub 20 is located at a high position, the opening and closing are controlled by the controller 80. An air charge chamber 93 having an electromagnetic air charge valve 96 is connected to a passage between the first and second hot water supply check valves 92 and 95. Referring to FIG. 1 and FIG. 4, a configuration including an air charge chamber 93, an air charge port 93a, and an electromagnetic air charge valve 96 is configured as a unit, and when the bathtub 20 is installed at a high place, The unit is connected to the passage between the first hot water check valve 92 and the second hot water check valve 95 of the cutoff valve device 90 as shown in FIG. On the other hand, when the bathtub 20 is installed at a low position, the unit is connected to the hot water supply path 51 of the gate valve device 90 as a vacuum breaker 99 as shown in FIG. When used as a vacuum breaker 99, the electromagnetic drive equipment such as an electromagnetic coil is removed from the unit, and a valve biasing spring 99a is attached instead to invert the valve logic. Of course, the position that was not attached is closed with a stopper. In addition, actually, the air charge room 93,
The unit including the air charge port 93a and the electromagnetic air charge valve 96 is installed from the beginning in the state of FIG. 1, the mounting position of the vacuum breaker 99 is closed with a stopper, and the bathtub 20 is installed at a lower position. in case of,
The unit is removed from the position shown in FIG. 1 and a stopper 120 is provided at the place where the unit is removed (see FIG. 4). Electromagnetic driving equipment such as an electromagnetic coil is removed from the removed unit, and a valve biasing spring 99a is used instead. The unit may be attached as a vacuum breaker 99. By attaching only the vacuum breaker 99 or the electromagnetic air charge valve 96 according to the position of the bathtub 20, the number of members can be reduced. Also, by using the same unit so that it can be used as both the electromagnetic air charge valve 96 and the vacuum breaker 99, the number of parts can be reduced.

[0018]

According to the first aspect of the present invention, the hot water supply valve and the back flow of the hot water supply downstream of the hot water supply valve are provided. A first hot-water supply check valve, a second hot-water supply check valve located below the first hot-water supply check valve to prevent hot-water backflow, and the first and second hot-water supply check valves. An air charge chamber connected from the side to a passage between the hot water supply check valve and an electromagnetic air charge valve capable of opening and closing the air charge chamber, and a vacuum breaker is part of a gate valve device. When the bathtub position is low, the electromagnetic air charge valve is always closed to cut off the water flow by a vacuum breaker, and when the bathtub position is high, the electromagnetic air charge valve is closed. Open / close control of water flow So was configured to perform, even in the bathtub where there is low even in a high place, can be reliably hot water supply at the time of hot water supply, also can reliably divorce of the water flow at the time of non-hot water supply,
It is possible to prevent air from entering the side of the circulation path for reheating the bath. Also, there is no need to drain accumulated water separately from hot water supply, and no equipment such as a drain solenoid valve is required.
It is possible to provide a low-cost bath drop-off hot-water supply gate valve device as a whole. According to the bath drop-off hot-water supply gate valve device of the second aspect, in addition to the effect of the configuration of the first aspect, the manual switching lever for always closing the electromagnetic air charge valve is provided with the electromagnetic air charging valve. Since it is provided for the charge valve, when the bathtub position is at a low position, the electromagnetic air charge valve can be manually closed with a very simple configuration. Further, according to the bath dropping hot water supply gate valve device according to claim 3, when the bathtub position is at a low position, the vacuum breaker is connected to the hot water supply path as a part of the gate valve device, and the bathtub position is high. In some cases, an air charge chamber having an electromagnetic air charge valve that is controlled to be opened and closed by a controller is connected to a passage between the first and second hot water supply check valves. Since only one of the air charge chamber having the electromagnetic air charge valve and the vacuum breaker needs to be attached, the cost can be reduced. In addition, it is possible to prevent air from entering the circulation path for post-bath heating, and it is not necessary to perform special drainage. Hot water can be supplied, and when the hot water is not supplied, the water flow can be reliably cut off.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing details of the gate valve device.

FIG. 3 is a sectional view showing another embodiment of the gate valve device.

FIG. 4 is a cross-sectional view of a gate valve device for explaining another embodiment of the present invention.

FIG. 5 is a configuration diagram showing a conventional device.

[Explanation of symbols]

 10 Heat exchange can body for bath heating 20 Bathtub 30 Bath circulation circuit 44 Bath water level sensor 51 Hot water supply line 80 Controller 90 Cutoff valve device 91 Hot water supply solenoid valve 92 First hot water supply check valve 93 Air charge chamber 93a Air charge Mouth 96 Electromagnetic air charge valve 99 Vacuum breaker 100 Water heater 110 Switching lever

──────────────────────────────────────────────────の Continued on the front page (72) Inventor Yukihiro Kamima 32, Akashi-cho, Chuo-ku, Kobe-shi, Hyogo Pref. (72) Inventor Katsuhiro Hidaka 32nd Akashi-cho, Chuo-ku, Kobe-shi, Hyogo Pref. 56) References JP-A-7-158974 (JP, A) JP-A-5-99495 (JP, A) JP-A-3-282154 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , (DB name) F24H 1/46 F24D 17/00

Claims (3)

(57) [Claims] An intervening hot water supply path between a hot water supply device and a hot water recirculation circuit, which drops water from the hot water supply channel into the hot water recirculation circuit during hot water supply and the hot water supply when no hot water is supplied. A bath drop-off hot water supply cutoff valve device that cuts off water on a road side and water on a circulation path side for bath heating, and a hot water supply valve that opens a passage of the hot water supply path at the time of hot water supply, and a downstream of the hot water supply valve. A first hot-water supply check valve located on the side to prevent backflow of hot water supply, a second hot-water supply check valve below the first hot-water supply check valve and preventing reverse flow of hot water supply,
It has an air charge chamber connected from the side to a passage between the first hot water supply check valve and the second hot water supply check valve, and an electromagnetic air charge valve capable of opening and closing the air charge chamber. And, a vacuum breaker is provided in the hot water supply path as a part of the cutoff valve device, and when the bathtub position is at a low position, the electromagnetic air charge valve is always closed to cut off the water flow by the vacuum breaker, and when the bathtub position is high. Wherein the edge of the water flow is cut off by controlling the opening and closing of the electromagnetic air charge valve. 2. The shut-off valve according to claim 1, wherein a manual switching lever for keeping the electromagnetic air charge valve closed at all times is provided for the electromagnetic air charge valve. apparatus. 3. A hot water supply device which is interposed between a hot water supply channel and a hot water recirculation circuit to drop water from the hot water supply channel into the hot water reheating circuit when hot water is supplied and to supply the hot water when no hot water is supplied. A bath drop-off hot water supply cutoff valve device that cuts off water on a roadside and water on a side of the bath additional heating circulation circuit, and a hot water supply valve for opening a passage of the hot water supply passage at the time of hot water supply, and a downstream of the hot water supply valve. A first hot-water supply check valve located on the side to prevent backflow of hot water supply, and a second hot-water supply check valve below the first hot-water supply check valve and preventing backflow of hot water supply, And when the bathtub position is in a low place, connect the vacuum breaker to the hot water supply path as a part of the gate valve device,
When the bathtub is located at a high position, an air charge chamber having an electromagnetic air charge valve that is controlled to be opened and closed by a controller is connected to a passage between the first and second hot water supply check valves. Features a gate valve for dropping in hot water.