JPH0621711B2 - Water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention provides a water channel having a heat exchanger for heating water, a water faucet, and a water governor for adjusting the amount of water in response to changes in water pressure. However, in the fuel supply path to the burner that heats the water heating heat exchanger, the shutoff valve, the hydraulic pressure response valve that opens only in the water supply state by interlocking with the water governor, and the shutoff valve and the hydraulic pressure response valve are The present invention relates to a hot water supply device including another fuel adjusting valve (for example, a fuel supply amount adjusting valve, a fuel governor, etc.) which is provided in series, and which is provided with a water discharge operation means for opening the water tap with the shutoff valve closed.

[Conventional technology]

In the hot water supply apparatus as described above, in the water discharge operation state by the water discharge operation means (that is, the state in which the burner opens the faucet without igniting and delivers the non-heated water), the water pressure responsive valve that originally does not need to be opened is the water governor. Since it opens due to the interlocking of the two, only the shut-off valve completely shuts off the fuel supply path to the burner, and the shut-off valve and the hydraulic pressure-responsive valve are used to ensure safety against fuel leakage. The fuel supply line cannot be cut off at certain points.

In addition, there are some valves in which two shut-off valves are provided in the fuel supply passage to shut off the fuel supply passage at a plurality of points even in the water discharge operation state. However, such as a water pressure responsive valve, a fuel governor, and a fuel supply amount adjusting valve. Two more fuel supply passages with many valves in series
If the individual shutoff valves are provided in series, the size of the device is increased and the cost of the device is increased.

Therefore, by providing a check mechanism that controls the opening operation of the water pressure responsive valve by interlocking with the water governor in the water discharge operation state, even if only one cutoff valve is used, the fuel supply path cutoff in the water discharge operation state We have previously proposed what can be done at two points, such as a water pressure responsive valve (see Japanese Patent Laid-Open No. 63-61814).

[Problems to be Solved by the Invention]

However, restricting the opening operation of the water pressure responsive valve in the water discharge operation state may impair the operation of the water governor that is linked to the water pressure responsive valve, which may lead to an abnormal water discharge state. occured.

For example, when the source water pressure is high, etc., in the hot water supply operation state in which the opening and closing check of the water pressure responsive valve is not performed, the water discharge amount (hot water amount) is maintained at an appropriate amount by the water governor's water amount adjustment function, but the water discharge operation is performed. When the state is switched, the amount of water output may become abnormally large due to an obstacle to the operation of the water governor due to the opening / closing check of the water pressure responsive valve.

In view of the above situation, an object of the present invention is to enable the fuel supply passage to be cut off at a plurality of locations in the water discharge operation state without providing a plurality of shutoff valves, and to maintain the normal function of the water governor even in the water discharge operation state. The point is to be able to keep it.

[Means for Solving the Problems]

The water heater according to the present invention is characterized in that a water passage having a heat exchanger for heating water is provided with a faucet and a water governor for adjusting the amount of water in response to a change in water pressure. In the fuel supply path to the burner that heats the exchanger, a shutoff valve, a water pressure responsive valve that opens only in the water supply state by interlocking with the water governor, and a fuel adjustment valve different from these shutoff valve and water pressure responsive valve are provided. In a configuration in which a water discharge operation means is provided which is interposed in series and opens the water faucet in a state in which the cutoff valve is closed, when the water discharge operation means is in the water discharge operation state, the fuel adjustment valve is in a fuel flow path cutoff state. The safety mechanism is provided, and the action and effect are as follows.

[Work]

That is, a fuel adjustment valve (for example, a fuel supply amount adjustment valve, a fuel governor, etc.) provided separately from the shutoff valve and the water pressure responsive valve.
Is originally not used for shutting off the fuel supply path.

For example, since the fuel governor narrows the fuel flow passage as the fuel supply source pressure increases, the fuel governor originally opens the fuel flow passage when the shutoff valve is closed and the fuel supply is cut off. Is in a state.

Further, since the fuel supply amount adjusting valve is originally associated only with the hot water supply temperature adjusting means, regardless of whether the device is in the hot water supply operation device, the water discharge operation state, or the hot water supply / water discharge stop state. The fuel passage in the fuel supply amount adjusting valve is opened to an opening degree according to the hot water supply temperature adjusting state.

However, the fuel adjusting valve provided separately from the shutoff valve and the hydraulically actuated valve is not used for shutting off the fuel supply passage in the usage pattern according to its role as described above, but is structurally a valve. Therefore, the structure of the fuel adjustment valve itself (that is, the structure of the fuel governor itself, the structure of the fuel supply amount adjustment valve itself, etc.) does not need to be modified, or is a simple modification even if modification is required. The fuel regulating valve such as the fuel governor and the fuel supply amount regulating valve can be applied to shut off the fuel supply passage only by performing the above.

Also, the original role of the fuel adjustment valve provided separately from the shutoff valve and the hydraulic pressure responsive valve (for example, the throttle adjustment of the fuel flow passage according to the change of the fuel supply source pressure and the fuel supply amount adjustment according to the hot water supply temperature adjustment state) (The original roles of the fuel governor and the fuel supply amount adjusting valve) are necessary only when hot water is supplied to the burner and not necessary in the water discharge operation state. Applying a fuel adjusting valve such as a quantity adjusting valve to shut off the fuel supply passage causes no problem in operating the apparatus.

Therefore, in the water discharge operation state, the fuel control valve provided separately from the fuel governor, the fuel supply amount adjusting valve, etc., the shutoff valve, and the water pressure responsive valve are used to shut off the fuel supply passage at a plurality of points. If the present invention configuration is adopted, that is, the fuel adjusting valve provided separately from the shutoff valve and the water pressure responsive valve is used when the water discharge operation means is in the water discharge operation state (the water valve is opened with the shutoff valve closed. If a safety mechanism for shutting off the fuel flow path is provided in the above state), even if the water pressure responsive valve opens and operates in conjunction with the water governor in the water discharge operation state,
The fuel supply valve to the burner is shut off at a plurality of points by the fuel adjusting valve that is in the fuel flow path shutoff state by the action of the safety mechanism and the shutoff valve that is in the closed state.

〔The invention's effect〕

That is, in the hot water supply device according to the present invention, (a) the fuel supply passage is cut off at a plurality of points in the water discharge operation state regardless of the opening operation of the water pressure responsive valve, and the safety against fuel leakage is high.

(B) It is not necessary to interpose two shutoff valves in the fuel supply passage to achieve the fuel supply passage interruption at multiple points in the water discharge operation state, and the number of valves installed in the fuel supply passage is not increased. As a result, it is possible to avoid an increase in size of the device and an increase in device cost.

(C) Since the water pressure responsive valve is allowed to open in conjunction with the water governor in the water discharge operation state, it does not hinder the operation of the water governor, and the water governor operates normally even in the water discharge operation state to ensure a proper water discharge state. Can be kept.

(D) Since a fuel governor or a fuel adjustment valve, which originally has a valve function in the structure, is used, and the structure of the fuel adjustment valve itself does not need to be modified. Also, even if a modification is required, a simple modification is enough,
Even when adopting the configuration of the present invention, it is easy to improve,
Also, the cost of improvement is low.

(E) The fuel regulating valve such as the fuel governor and the fuel supply amount regulating valve is used for shutting off the fuel supply passage in the water discharge operation state where its original role is unnecessary. There is no loss, and there are no secondary problems in operating the equipment.

〔Example〕

 Next, examples will be described.

FIG. 1 shows a gas instantaneous water heater as an example of a water heater, which includes a fin-tube type water heating heat exchanger (1), and
A burner (2) for heating it is provided, and in the water supply passage (3) to the heat exchanger (1), a water faucet (4), a water governor (5) that adjusts the water supply amount in response to changes in water pressure, Also, the diversion valve (6) is interposed, and the hot water outlet (7) from the heat exchanger (1) is connected to the hot water outlet (9) via the flexible pipe (8).

In addition, the shutoff valve (1) is installed in the gas fuel supply path (10) to the burner (2).
1), a water pressure responsive valve (12) that opens only when water is supplied by interlocking with a water governor (5) via an interlocking rod (12a), and a burner (2) that responds to changes in the source pressure of gas fuel supply. A gas governor (13) for maintaining the gas fuel supply pressure at an appropriate pressure and a regulating valve (14) for regulating the gas fuel supply amount are provided.

The diversion valve (6) regulates the amount of water supplied to the heat exchanger (1) and the amount of bypass water that is diverted from the water supply passage (3) to the hot water passage (7) via the bypass water passage (15). is there.

The shut-off valve (11) is a closed urging type solenoid valve.
1a) is a valve body which is constantly urged toward the closing side by a spring (11b), and (11c) is an electromagnetic coil which opens and operates the valve body (11a) against the closing urging force.

A so-called pilot type diaphragm type water faucet is used for the water faucet (4), (4a) opens and closes the diaphragm valve body (4a) as the main valve body. Is a water faucet operating rod for opening and closing the pilot valve body (4c).

Hot-water supply start and stop operations are push-button hot water supply operation tools (16)
This hot water supply operation tool (16), as shown in FIGS. 2 to 4, has a holding mechanism (18) provided for a rod portion (17) connected to the hot water supply operation tool (16) and a hot water supply operation. Filling (16)
By the cooperation action with the spring (19) that biases the projection side to the protruding side, it is automatically held at the predetermined pushing position (b) with the pushing operation from the protruding position (a), and the pushing position.
When it is pushed again while it is held in (b), the holding is released and it automatically returns to the initial protruding position (a).

Regarding the operation of the faucet (4), as a mechanical interlocking mechanism for operating the faucet, the contact with the tip of the rod part (17) is performed as the hot water supply operation tool (16) is pushed from the protruding position (a). This provides a first swinging member (21) swinging around the first axis (P ₁ ) against the biasing force of the return spring (20).
A fork part (21a) for pulling and operating the faucet operating rod (4b) by locking is provided at the tip of 1).

In other words, by swinging the first swinging member (21) in accordance with the push operation of the hot water supply operation tool (16) from the protruding position (a), the faucet operating rod (4b) becomes the self-urging force of the faucet (4). Pull the water valve to open the faucet (4) and hold the hot water supply operation tool (16) at the push-in position (b) to keep the water tap operating rod (4b) in the pulling operation state. When the stopper (4) is held open and the hot water supply operation tool (16) is returned to the projecting position (a) by the pushing operation again, the first swing due to the biasing force of the return spring (20) When the moving member (21) returns and swings, the pulling operation of the faucet operating rod (4b) is released and the faucet
The valve (4) is closed by its own biasing force.

On the other hand, regarding the operation of the shutoff valve (11), a micro switch (22) which is turned off by pushing the operation piece (22a) against the urging force is provided, and the first swing member (21) is provided. ,
The micro switch (22) is turned off by pressing the operation piece (22a) by the urging force of the return spring (20). The switch operation part (21b) is connected and the micro switch (22) is turned on.
The controller (23) is made to open and close the shutoff valve (11) based on the OFF state.

That is, when the hot water supply operation tool (16) is pushed from the projecting position (a), the switch operation part (21b) is released from the operation piece (22a) due to the associated swing of the first swing member (21). Then, the micro switch (22) is turned ON, and the controller (23) is caused to execute the opening operation of the shutoff valve (11) based on this ON, and the hot water supply operation tool (16) is pushed to the projecting position by pressing it again.
When it is returned to (a), the switch operating part (21b) presses the operation piece (22a) along with the return movement of the first positive movement member (21) by the urging force of the return spring (20), and the micro switch (22a) is pressed. 22) is turned off, and the shutoff valve (1
The controller (23) is made to execute the closing operation of (1).

The controller (23) turns on the micro switch (22).
Based on the above, the valve opening operation power supply from the dry battery (24) to the shutoff valve electromagnetic coil (11c) is started to open the shutoff valve (11), and
The operation command is given to the ignition circuit (25) and the spark plug (26) is spark-operated for the set ignition time by the power supply from the dry battery (24), and the dry battery (24) is turned on when the micro switch (22) is turned off. The shut-off valve electromagnetic coil (11c) is shut off from the shut-off valve (11c) by closing the shut-off valve (11) with a biasing force.

In short, for hot water supply operation, if the push button type hot water supply operation tool (16) is pushed from the protruding position (a), the faucet
(4) is opened by mechanical movement to start water supply, the water pressure responsive valve (12) is opened accordingly, and the spark plug (26) is spark-operated when the micro switch (22) is turned on. And the shutoff valve (11) is opened and the burner (2) is ignited,
Therefore, hot water supply is started.

After the hot water supply is started, the hot water supply operation tool (16) is in the pushed position.
While held in (b), the holding keeps the faucet (4) mechanically open, the hydraulic pressure responsive valve (12) open, and the micro switch. By keeping the ON state of (22), the shut-off valve (11) is kept in the open state, whereby hot water supply is continued.

After that, the hot water operation tool held in the push-in position (b)
When (16) is returned to the protruding position (a) by pushing again,
The faucet (4) is closed mechanically and the water supply stops,
Along with this, the water pressure responsive valve (12) is closed and the shutoff valve (11) is closed by turning off the micro switch (22) to extinguish the burner (2), thereby stopping hot water supply.

The hot water supply temperature is adjusted by using the dial type temperature control tool (27) arranged on the outer periphery of the push button hot water supply operation tool (16) to divide the flow (6).
And the regulating valve (14) are interlocked to adjust the amount of water supplied to the heat exchanger (1), the amount of bypass water, and the amount of gas fuel supplied in a predetermined correlation. Regarding the adjustment of the heat exchanger feed water amount and bypass water amount by operating the diversion valve (6) with the temperature adjustment tool (27), the temperature adjustment tool (27) is rotated from the high temperature end side to the low temperature side. Along with this (see FIG. 8), the amount of bypass water (Q _B ) is kept at 0 up to a certain intermediate operation position, and only the amount of water supply (Q _H ) to the heat exchanger (1) is gradually increased, and the intermediate operation is performed. For operation from the position to the lower temperature side, gradually increase the bypass water amount (Q _B ) while gradually decreasing the water supply amount (Q _H ) to the heat exchanger (1) to increase the total water amount (Q _H + Q _B ) To the previous intermediate operation position
It is designed to be gradually increased in a state in which the increase of _H ) is continued.

Further, in the case of adjusting the amount of gas fuel supplied by operating the adjusting valve (14) with the temperature adjusting tool (27) in contrast to the water amount adjusting mode as described above, the temperature adjusting tool (27) moves from the high temperature end side to the low temperature side. Amount of gas fuel supplied as it is rotated to (see Fig. 8)
(G) is gradually reduced.

As shown in FIG. 6, the flow dividing valve (6) has a bottomed cylindrical rotary valve body (6b) directly connected to the rotary operation shaft (6a) and an upstream water supply passage (3a) connected to the heat exchanger (1). A first flow path hole (6c) communicating with the downstream water supply channel (3b) and a second flow path hole (6d) communicating with the upstream water supply channel (3a) to the bypass water channel (15). It is formed in a relative positional relationship, so that by the rotation operation of the rotation operation shaft (6a), the overlapping state of the first flow path hole (6c) and the inlet of the downstream side water supply path (3b), and the second flow path. The amount of water supplied to the heat exchanger (1) can be changed by changing the overlapping state of the hole (6d) and the inlet of the bypass channel (15).
(Q _H ) Bypass water amount (Q _B ) is changed in a predetermined correlation.

On the other hand, as shown in FIGS. 7 (a) and 7 (b), the adjusting valve (14) is locked to the main valve body (14b) from the predetermined pushing position when the operating rod (14a) is pushed. Attach a locking piece (14c) that operates the main valve body (14b) to the open side, and attach it to the operating rod (14a).
The cylindrical body (14d) integrally connected to b) has a plurality of slit-shaped holes (14e) that increase the opening degree of the gas fuel flow passage in the valve as the main valve body (14b) is displaced toward the open side. Formed and main valve body (14b)
Sub valve body (14g) for opening and closing the small fuel flow hole (14f) formed in the
Is connected to the operating rod (14a) so as to open by pushing the operating rod (14a), and the operating rod (14a) is urged toward the protruding side, and the main valve is urged by the urging of the operating rod. Body (14
b) The first spring (14h) that closes the sub-valve (14g) and the main valve (14b) are biased toward the valve closing side by using the sub-valve (14g) as a reaction force fulcrum to lock the valve. One piece (14c) is the main valve body (14b)
The main valve body (14
b) A second spring (14i) for keeping the valve closed (a spring weaker than the first spring (14h)) is provided. Therefore, when the operating rod (14a) is pushed in, the sub valve body (14
g), and then the main valve body (14b) is opened and displaced to the open side, so that the gas fuel supply amount (G) to the burner (2) is adjusted to the operating rod (14a). It is designed to gradually increase with the pushing operation of, and conversely, the first spring (14h)
In order to return the operating rod (14a) to the protruding side by the urging force of the operating rod (14a), the gas fuel supply amount (G) is changed in the reverse operation to the above.
It is designed to gradually decrease as 4a) returns to the protruding side. As shown in FIGS. 2 to 5, the interlocking operation of the temperature adjusting device (27) and the flow dividing valve (6) is described in
Provided with a donut type rotating body (28) that rotates integrally with (27),
A gear part (28a) is formed on a part of the peripheral part of the rotating body (28),
The fan-shaped gear (29) connected to the rotary operation shaft (6a) of the flow dividing valve (6) and the gear portion (28a) of the rotating body (28) are engaged with each other.

Also, regarding the interlocking of the temperature adjusting tool (27) and the adjusting valve (14),
The donut type rotating body (28) is provided with a second swing member (30) for pushing in the adjusting valve operating rod (14a) biased to the protruding side by swinging around the second axis (P ₂ ). The second side of the rotating body (28) is rotated to one side by the contact with one end of the second swinging member (30) on the back surface of the second swinging member (30) (rotation of the temperature adjusting tool (27) to the high temperature side).
A first cam (28b) for swinging the swinging member (30) toward the pushing operation side of the adjusting valve operating rod (14a) is provided.

This gas instantaneous water heater has a shutoff valve (11) in addition to the hot water supply start / stop operation function and hot water supply temperature adjustment function as described above.
It is equipped with a water discharge operation function that simply discharges water from the water discharge tool (9) by opening the water faucet (4) with the water closed (3). ₃ )
By swinging around, the operation piece (22
a) The third swinging member (31) for pushing the
Provided next to the switch operation part (21b) in (21),
Then, while setting the water discharge operation position at the low temperature side end in the rotation operation range of the temperature adjusting tool (27), the donut type rotating body
On the back surface of (28), when the temperature adjusting tool (27) is rotationally operated to the water discharge operation position, the third rocking member (31) is brought into contact with one end of the third rocking member (31) to switch the operation piece. A second cam (28c) for swinging to the push operation side is provided.

In other words, if the hot water supply operation tool (16) is pushed from the protruding position (a) while the temperature adjusting tool (27) is in the water discharge operation position, the faucet (4) will be pushed by the hot water operation operation tool (16). First swing member by
Although the valve is opened by the rocking of (21) as in the hot water supply start operation, the shutoff valve operation system is irrespective of the rocking of the first rocking member (21) by the pushing operation of the hot water supply operation tool (16). , Second cam
The operation piece (22a) is pushed and held by the swing of the third swing member (31) due to the contact with the (28c), and the micro switch
Since (22) is kept OFF, the shutoff valve (11) is maintained in the closed state, so that the water outflow state appears.

The appearance of this water discharge state can also be achieved by rotating the temperature adjusting tool (27) to the water discharge operation position while the hot water supply operation tool (16) is already held in the pushed-in position (b). is there.

Further, when the temperature adjusting tool (27) is returned and rotated from the water discharge operation position to within the hot water supply temperature adjustment operation range in the water discharge state, the third
When the contact of the second cam (28c) with the swing member (31) is released, the operation pushing operation of the third swing member (31) is released and the micro switch (22) is turned on by the self-urging force. Based on that, the shut-off valve (11) is opened by the operation of the controller (23) and the spark plug (26) is spark-operated as in the hot water supply start operation, so that the burner (2) is ignited. That is, it is possible to switch from the water discharge state to the hot water supply state only by returning the temperature adjusting tool (27).

On the other hand, when the temperature adjusting tool (27) and the adjusting valve (14) are interlocked via the first cam (28b) and the second swinging member (30), the temperature adjusting tool (27) is rotated to the low temperature side. The adjusting valve (14) that reduces the amount of gas fuel supply as it is heated (see Fig. 8) is
When (27) is operated to the water discharge operation position on the low temperature side end, following the closing of the main valve body (14b), the sub valve body (14g) is also closed so that the gas fuel flow passage is shut off. The interlocking relationship with the temperature adjuster (27) is set.

That is, in the water discharge operation state in which the temperature adjusting tool (27) is operated to the water discharge operation position, the second cam (28c) and the third swinging member.
In addition to turning off the micro switch (22) to close the shutoff valve (11) by the interlocking action of (31), the interlocking action of the first cam (28b) and the second swinging member (30) Regulating valve
(14) is also closed, so that the gas fuel supply passage (10) is connected to the shutoff valve (11) and the regulating valve (14) even when the hydraulic pressure responsive valve (12) is opened when water is discharged. It is designed to maintain high safety against gas leakage by shutting off at two points.

[Another embodiment]

 Next, another embodiment will be listed.

(a) The water discharge operation means that opens the faucet with the shutoff valve closed is
It may be of any form and structure, for example,
In normal operation, it is possible to open only the faucet by operating the operation tool that opens both the shutoff valve and the faucet while appropriately controlling only the shutoff valve opening operation by the restraint mechanism. It may be of a type or structure, and the operation tool for opening the shutoff valve and the operation tool for opening the faucet are separate, and only the operation tool for opening the faucet is operated. By doing so, it is also possible to make it possible to reveal the water outflow state.

(b) When the water discharge operation means is in the water discharge operation state, the gas governor (fuel governor) (13) is set to the fuel flow path cutoff state, so that the cutoff valve (11) at the multiple points of the fuel supply path in the water discharge operation state The gas governor (13) and the gas governor (13) may be used, or both the gas governor (13) and the fuel supply amount adjusting valve (14) are set to the fuel flow path cutoff state when the water discharge operation means is in the water discharge operation state. , Thereby shutting off the fuel supply path at multiple points in the water discharge operation state, shutoff valve (11), gas governor
(13) and the fuel supply amount adjusting valve (14) may be used.

(c) Various types and structures of the fuel supply amount adjusting valve used for shutting off the fuel supply passage can be applied. For example, as shown in FIG. 9, adjusting the opening degree of the main valve body (14j), The throttle valve element (14k) is inserted into the tapered fuel flow hole (14k) formed in the main valve element (14j).
The fuel supply amount is adjusted by adjusting the opening of l), and the main valve body (14j) and throttle valve body (14l) are closed, and the small valve body (14n) for the small fuel flow hole (14m) is ) May be closed to shut off the fuel flow path.

Also, various types and structures of gas governors used for shutting off the fuel supply passage can be applied.

Further, the valve used for shutting off the fuel supply path is not limited to the fuel supply amount adjusting valve or the gas governor (fuel governor), and other various valves provided separately from the shutoff valve and the water pressure responsive valve. The fuel adjustment valve can be applied.

(d) When the water discharge operation means is in the water discharge operation state, a mechanism for making the fuel flow path cutoff state of the fuel control valve other than the fuel governor, the fuel supply amount adjustment valve, the shutoff valve, and the water pressure responsive valve is provided. ,
Any type and structure may be used, and these mechanisms are collectively referred to as a safety mechanism.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures and methods of the accompanying drawings by the description.

[Brief description of drawings]

1 to 8 show an embodiment of the present invention, FIG. 1 is an overall configuration diagram of an instantaneous water heater, FIGS. 2 to 5 are schematic diagrams showing an operating structure, and FIG. 6 is a shunt valve. Structural drawing of Fig. 7 (a),
(B) is a structural diagram of the regulating valve, and FIG. 8 is a graph showing a mode of regulating the water amount and the fuel supply amount. FIG. 9 is a structural diagram of a regulating valve showing another embodiment of the present invention. (1) …… Heat exchanger, (2) …… Burner, (4) …… Faucet,
(5) …… Water governor, (10) …… Fuel supply path, (11) …… Shutoff valve, (12) …… Water pressure responsive valve, (13) …… Fuel governor, (14)…
…Regulating valve.

Claims (3)

[Claims] 1. A water channel provided with a heat exchanger (1) for heating water,
A fuel supply path to a water faucet (4) and a burner (2) that heats the water heating heat exchanger (1) through a water governor (5) that adjusts the amount of water in response to changes in water pressure. In (10), a shutoff valve (11), a water pressure responsive valve (12) that opens only in a water supply state by interlocking with the water governor (5), and the shutoff valve (11) and water pressure responsive valve (12)
In addition to the fuel adjustment valve in series, the shutoff valve (11)
A hot water supply apparatus provided with a water discharge operation means for opening the water faucet (4) in a state where the fuel adjustment valve is in a fuel flow path cutoff state when the water discharge operation means is in a water discharge operation state. Hot water supply device with a safety mechanism. 2. The fuel adjustment valve is a fuel supply amount adjustment valve (14)
The hot water supply device according to claim 1. 3. The water heater according to claim 1, wherein the fuel adjusting valve is a fuel governor (13).