JP2004092872A - Valve for mixing hot water and water for hot water appliance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a valve for mixing hot water and water for an inexpensive electric hot water appliance simple in structure and easy in production. <P>SOLUTION: The valve 20 for mixing hot water and water for the electric hot water device is constituted by including a mixing chamber 36, a water supply inlet port 28, an inner water supply passage 34, a partition wall 38, a water inlet port 40 through which the inner water supply passage 34 communicates with the mixing chamber 36, a hot water inlet port 44 for supplying the hot water of the hot water appliance 10 to the mixing chamber 36, a branch water passage 42 for bypassing the supplied water from the inner water supply passage 34 to the hot water device, a valve body 52 for holding the hot water inlet port 44 in a constantly opening state, changing the opening degree of the water inlet port 40 and adjusting the ratio of the flow of water to the mixing chamber 36 to the flow of the hot water from the hot water appliance 10, and an outlet port 30 for discharging the mixed water. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot / water mixing valve for a water heater that mixes hot water from a water heater and water from a water supply source to adjust the temperature, and causes the water to flow out from an outlet.
[0002]
Problems to be solved by the prior art and the invention
As shown in FIG. 5, when hot water (hot water) boiled by hot water supply device 200 is discharged from hot water mixing valve 202, if hot water mixing valve 202 is at a position far away from hot water supply device 200, hot water mixing valve 202 The hot water does not immediately come out even if the opening operation is performed, and first, the cold water inside the long pipe 204 is discharged from the hot and cold water mixing valve 202.
[0003]
For example, the hot water used by opening the hot water mixing valve 202 in the bathroom needs to be at least a predetermined temperature (usually at least about 40 ° C.), and hot water at a temperature lower than that is never used.
Therefore, the cold water coming out of the hot water mixing valve 202 during the initial period cannot be used, and this is dead water (water discarded as it is).
[0004]
In addition, there is a problem that the user of the hot water mixing valve 202 has to wait a long time until the hot water of the desired temperature comes out of the hot water mixing valve 202.
Therefore, in recent years, in order to solve the problem of the generation of a large amount of wasteful water and a long wait time for hot water, an electric water heater as an immediate hot water supply device is provided near a hot water mixing valve.
[0005]
By the way, the hot water from the electric water heater is usually sent to a hot / water mixing valve, where it is mixed with water sent from a water supply source at a predetermined ratio, adjusted to a desired appropriate temperature, and then discharged and used.
The one disclosed in Patent Document 1 below is conventionally known as a hot water mixing valve for that purpose.
[0006]
FIG. 6 shows a hot water mixing valve disclosed in Patent Document 1 below.
In the figure, reference numeral 206 denotes a cylindrical casing having a water inlet 208 and a hot water inlet 210 formed at predetermined locations.
A valve body 212 is slidably housed inside the casing 206.
The outer peripheral surface of the sliding portion 213 of the valve body 212 is circular, and the circular outer peripheral surface is slidably fitted to the circular inner peripheral surface 214 of the casing 206 through an O-ring in a watertight manner. are doing.
[0007]
In the hot water mixing valve 205, the opening of the water inlet 208 and the hot water inlet 210 is simultaneously reduced by the water side valve portion 212A and the hot water side valve portion 212B of the valve body 212 by the minute movement of the valve body 212 in the horizontal direction in the figure. The temperature of the mixed water is adjusted by changing the inflow amount of water and the inflow amount of hot water.
The hot water flowing from the hot water inlet 210 flows into the water passage 218 through the opening 216 formed in the valve body 212, and subsequently flows out from the opening 220 into the mixing chamber 222, and the water flowing from the water inlet 208 there. And hot water are mixed.
Then, the mixed water flows out from an outlet 224 formed in the casing 206 to the outside.
[0008]
A temperature sensing element 226 is accommodated in the mixing chamber 222.
The temperature sensing element 226 contains therein a wax that expands or contracts according to the temperature of the mixed water, and operates so as to push out the rod 228 by the expansion of the wax. That is, the temperature sensing element 226 expands or contracts as a whole according to the temperature of the mixed water.
Then, the position of the valve body 212 is finely adjusted in the left-right direction in the figure based on the expansion and contraction to adjust the inflow of water from the water inlet 208 and the inflow of hot water from the hot water inlet 210.
[0009]
Reference numeral 230 denotes a rotary operation shaft for setting and controlling the temperature of the mixed water. When the rotary operation shaft 230 is rotated by a handle, the cylindrical advance / retreat member 232 is advanced / retracted by screw feed in the left / right direction in the drawing.
For example, when the advancing / retreating member 232 is pushed rightward in the drawing by the rotary operation shaft 230, the temperature sensing element 226 is pushed rightward in the drawing via the spring 234, thereby shifting the position of the valve body 212 rightward in the drawing. Can be
The valve body 212 slightly moves in the left-right direction at the shift position based on the expansion and contraction operation of the temperature sensing element 226, and automatically adjusts the temperature of the mixed water to the set temperature.
[0010]
In the case of a conventional hot water mixing valve represented by the hot water mixing valve shown in FIG. 6 disclosed in Patent Document 1, as described above, the water body inlet 212A and the hot water valve 212B are provided in the valve body 213 to provide a water inlet. It is necessary to delicately adjust the opening of the hot water inlet 208 and the hot water inlet 210 at the same time, and the supply pressure of the water and the supply pressure of the hot water change independently of each other. Become.
[0011]
For this reason, in the case of the conventional hot water mixing valve 205, the structure and mechanism are complicated, the processing accuracy of the casing, the valve body and other parts requires high accuracy, the number of parts and the number of processing locations are large, and as a result, the hot water mixing valve is expensive And it had to be enlarged.
[0012]
[Patent Document 1]
Japanese Utility Model Publication No. 7-7662
[Means for Solving the Problems]
The hot and cold water mixing valve for a water heater of the present invention has been made to solve such a problem.
The first aspect of the present invention is a hot water mixing valve that mixes and discharges water supplied from a water supply source and hot water from a water heater, and (a) a mixing chamber that mixes water and hot water; (B) a water supply inlet for supplying water from a water supply pipe, (c) an internal water supply channel formed following the water supply inlet, and (d) a partition wall for separating the internal water supply passage from the mixing chamber. (E) a water inlet provided on the partition wall for communicating the internal water supply passage with the mixing chamber to allow water from the internal water supply passage to flow into the mixing chamber; and (f) a water inlet from the water heater. A hot water inlet for allowing hot water to flow into the mixing chamber; (g) a branch water passage that branches off from the internal water supply passage and bypasses water supply to the water heater side; and (h) the hot water inlet is kept open at all times. On the other hand, the opening degree of the water inlet is changed to increase or decrease the amount of water flowing into the mixing chamber from the water inlet. And a valve body for decreasing and increasing the amount of water flowing into the water heater through the branch water channel, and (i) an outlet for discharging mixed water from the mixing chamber. I do.
[0014]
According to a second aspect of the present invention, in the first aspect, the hot and cold water mixing valve includes a temperature sensing element in the mixing chamber, and moves the valve element according to a change in temperature of the temperature sensing element. Is a thermostatic type mixing valve that automatically adjusts the temperature of the mixed water by changing the opening degree.
[0015]
According to a third aspect of the present invention, in any one of the first and second aspects, the valve body includes a valve shaft and a valve portion, and the valve portion is moved forward and backward in the axial direction to change the opening of the water inlet. It is characterized in that it is made to be.
[0016]
According to a fourth aspect of the present invention, in any one of the first to third aspects, the valve body includes a valve portion that changes an opening of the water inlet and a second valve portion that is integrated with or interlocked with the valve portion. The second valve section changes the branch water channel to a closed / open state in conjunction with a change in the opening degree of the valve section to the open / closed state.
[0017]
A fifth aspect of the present invention is characterized in that, in any one of the first to fourth aspects, the hot / water mixing valve is directly connected to the water heater without substantially passing through a pipe.
[0018]
[Action and effect of the invention]
As described above, the present invention makes use of the characteristic that the water heater pushes out the internal hot water in accordance with the amount of supplied water, and the hot water mixing valve for the water heater has the following configuration, that is, the internal water supply passage and the mixing chamber. A water inlet provided in the partition wall of the above, a branch water passage branched from the internal water supply passage and bypassing the water supply to the water heater side, a hot water inlet for flowing hot water from the water heater into the mixing chamber, and adjusting the temperature of the mixed water. And a valve element for changing the opening of the water inlet while keeping the hot water inlet constantly open, thereby allowing water to flow from the water inlet to the mixing chamber. At the same time as the amount is increased or decreased, the amount of water flowing into the water heater through the branch channel is increased or decreased.
[0019]
In the hot water mixing valve for a water heater according to the present invention, since the valve body merely changes the opening of the water inlet, the hot water mixing valve can be configured with a simple structure, and the price is low. I can do it.
[0020]
On the other hand, the hot water mixing valve can automatically increase or decrease the amount of water flowing into the mixing chamber by changing the opening of the water inlet by the valve body, and at the same time, change the amount of water flowing into the water heater. In other words, the flow rate of hot water from the water heater into the mixing chamber can be reduced or increased, the mixing ratio of water and hot water in the mixing chamber can be adjusted with a simple operation, and the temperature can be adjusted from the outlet to a desired temperature. The conditioned hot water can be drained.
[0021]
Here, the hot water mixing valve is provided with a temperature sensing element in the mixing chamber, and moves the valve element in accordance with a change due to the temperature sensing of the temperature sensing element to automatically change the opening of the water inflow port, thereby changing the mixed water temperature. Can be made into a thermostatic hot / water mixing valve that automatically adjusts the temperature.
This makes it possible to automatically obtain hot water at a desired temperature from the outlet by appropriately setting the hot water mixing valve.
[0022]
In the present invention, the valve body may be provided with a valve shaft and a valve portion, and the valve portion may be advanced and retracted in the axial direction to change the opening of the water inlet. Item 3).
By doing so, the valve body and the entire structure including the valve body can be made a simpler structure.
[0023]
In the present invention, the valve body further includes a valve portion that changes the opening of the water inlet and a second valve portion that is integrated with or interlocked with the valve portion, and interlocks with the change in the opening degree of the valve portion to the open / closed state. Thus, the second valve section can change the branch water channel to a closed / open state (claim 4).
[0024]
The hot-water mixing valve of the present invention has a function of guiding a part of the water supplied from the water supply source to the mixing chamber and bypassing the remaining part to the water heater side. There is no need to separately provide a branching section for branching the water supply from the water heater and the hot water mixing valve to the outside of the hot water mixing valve and connect it to the pipe.Therefore, the hot water mixing valve of the present invention uses the hot water mixing valve as it is. It is possible to connect directly to the vessel (claim 5). Thus, by directly connecting the water / water mixing valve to the electric water heater, it becomes possible to substantially integrate the water heater and the water / water mixing valve, and the size and simplification of the hot water supply system including piping are reduced. And the cost can be reduced.
[0025]
【Example】
Next, embodiments of the present invention will be described in detail with reference to the drawings.
In FIG. 1, reference numeral 10 denotes an electric water heater in which an electric heater 12 is disposed inside a can body 11.
The electric water heater 10 stores hot water inside the can 11 by the heating action of the electric heater 12.
[0026]
Openings 14 and 16 are provided in the upper part of the electric water heater 10, and water is supplied from the opening 14 to the inside, and hot water inside is taken out from the opening 16 to the outside.
Here, the water flowing from the opening 14 is guided by the pipe 18 and flows into the inside of the can 11 from the bottom.
[0027]
A hot water mixing valve 20 is directly connected to the upper surface of the electric water heater 10.
The hot and cold water mixing valve 20 has a casing 22, from which a pair of fixed flanges 24 extend as shown in FIG.
A fixing hole 26 is formed in the fixing flange 24, and the hot and cold water mixing valve 20 is fixed to the upper surface of the electric water heater 10 with a fastener such as a screw in the fixing hole 26.
[0028]
FIG. 2 specifically shows the internal structure of the hot and cold water mixing valve 20.
As shown in the figure, the hot water mixing valve 20 has a feed water inlet 28 at one end in the axial direction for feeding water from a water supply pipe, and allows the mixed water to flow at the opposite end. It has an outlet 30.
The feed water inlet 28 and the water outlet 30 are provided with external threads 32 on the outer peripheral surface thereof so that they can be connected to piping.
[0029]
Inside the casing 22, an internal water supply channel 34 formed following the water supply inlet 28 and a mixing chamber 36 for mixing water and hot water are formed, and these are partitioned by a partition wall 38. .
A water inlet 40 is formed in the partition wall 38, and water flowing through the internal water supply passage 34 can flow into the mixing chamber 36 from the water inlet 40.
[0030]
A branch water passage 42 is formed from the internal water supply passage 34 to bypass the water supply to the electric water heater 10 side, and water supplied through the internal water supply passage 34 is supplied to the electric water heater 10 through the branch water passage 42. It flows into the inside from the opening 14.
More specifically, water from the branch water channel 42 is pushed out to the bottom of the electric water heater 10 through the pipe 18.
[0031]
A hot water inlet 44 is formed in the hot / water mixing valve 20 so as to communicate with the mixing chamber 36, and a hot water passage 46 is formed through the casing 22 following the hot water inlet 44.
Hot water inside the electric water heater 10 flows into the mixing chamber 36 from the hot water inlet 44 through the hot water passage 46 through the opening 16 on the upper surface thereof.
Note that the space between the branch water passage 42 and the opening 14 and the space between the hot water passage 46 and the opening 16 are water-tightly sealed by O-rings 48 and 50, respectively.
[0032]
A valve body 52 is provided inside the mixing chamber 36.
The valve body 52 has a large-diameter valve portion 54 that changes the degree of opening of the water inlet 40 formed in the partition wall 38 by moving in the left-right direction in the drawing, and a valve shaft 56 extending rightward from the valve portion 54 in the drawing. And
A plate-like sliding portion 58 is provided at the end of the valve shaft 56 opposite to the valve portion 54, and the sliding portion 58 is slidable on the inner surface of the mixing chamber 36 in the left-right direction in the figure. ing.
A communication hole 59 is formed in the sliding portion 58 so that mixed water of water and hot water flowing from the water inlet 40 and the hot water inlet 44 can flow to the outlet 30 through the communication hole 59. Have been.
[0033]
A temperature-sensitive spring 60 made of a shape memory alloy as a temperature-sensitive body is provided in the mixing chamber 36.
One end of the temperature sensing spring 60 is in contact with a sliding portion 58 of the valve body 52, and biases the valve body 52 rightward in the drawing, that is, the valve body 52 in the valve opening direction.
[0034]
The temperature-sensitive spring 60 changes the urging force according to the temperature of the mixed water in the mixing chamber 36. Specifically, when the temperature of the mixed water is high, the spring force is increased in accordance with the temperature, and the urging force of the valve body 52 in the valve opening direction is increased.
Conversely, if the temperature of the mixed water decreases, the spring force decreases, and the urging force of the valve body 52 in the valve opening direction is weakened.
A bias spring 62 is disposed in the mixing chamber 36 so as to form a pair with the temperature-sensitive spring 60. The biasing force is applied to the valve element 52 in a direction in which the temperature-sensitive spring 60 is contracted, that is, the valve element 52. In the direction to close the valve.
[0035]
As described above, in the case of the hot water mixing valve 20 of this example, the valve body 52 keeps the hot water inlet 44 always open, and only the water inlet 40 changes the opening degree by axial movement.
Therefore, in the hot water mixing valve 20 of the present embodiment, when the water supplied from the water supply pipe flows into the water supply inlet 28 with the valve body 52 closed, that is, with the water inlet 40 closed, the entire water supply is branched into the branch water passage 42. To bypass the electric water heater 10. That is, the whole flows into the electric water heater 10.
[0036]
Then, the hot water inside the electric water heater 10 is pushed out of the electric water heater 10 by the amount of the water flowing into it, flows into the mixing chamber 36 from the hot water inlet 44, flows through the mixing chamber 36 as it is, and flows out of the outlet 30. leak. That is, when the valve body 52 completely closes the water inlet 40, only the hot water flows out of the hot water mixing valve 20.
[0037]
On the other hand, when the valve body 52 is fully opened, that is, when the valve portion 54 completely opens the water inlet 40, almost all of the water supplied from the water inlet 28 flows into the mixing chamber 36 through the water inlet 40. Flows out of the outlet 30 through the mixing chamber 36 as it is.
[0038]
This is because, in addition to the diameter α of the water inlet 40 being larger than the diameter β of the branch water channel 42, the flow of water flowing into the electric water heater 10 through the branch water channel 42, This is because the resistance for pushing out the hot water works greatly.
That is, when the water inlet 40 is in the fully open state, almost the entire supply water flowing into the internal water passage 34 enters the mixing chamber 36 from the water inlet 40 due to the difference in diameter and the resistance of the hot water in the electric water heater 10. .
[0039]
The opening of the valve body 52 is controlled by the urging force of the temperature-sensitive spring 60 and the urging force of the bias spring 62.
That is, if the temperature of the mixed water is higher than the set temperature, the urging force of the temperature-sensitive spring 60 overcomes the urging force of the bias spring 62, and the valve body 52 is pushed rightward in the drawing, thereby opening the water inlet 40. Changes widely, and the amount of water flowing into the mixing chamber 36 increases.
[0040]
On the other hand, if the temperature of the mixed water is lower than the set temperature, the urging force of the temperature-sensitive spring 60 becomes smaller and the urging force of the bias spring 62 becomes relatively larger, whereby the valve body 52 moves to the left in the figure. As a result, the opening of the water inlet 40 changes slightly, and the amount of water flowing into the mixing chamber 36 through the water inlet 40 decreases.
[0041]
In the present embodiment, the opening of the water inlet 40 by the valve body 52 is appropriately set by appropriately adjusting the biasing force of the temperature sensing spring 60 and the bias spring 62, and The mixed water at the desired temperature can always be discharged. The outlet 30 is separate from the main body of the casing 22, and is screwed to the main body of the casing 22.
[0042]
In the hot water mixing valve 20 of this example, since the valve body 52 merely changes the opening of the water inlet 40, the hot water mixing valve 20 can be configured with a simple structure, and the price is low. Can be made.
[0043]
On the other hand, the hot water mixing valve 20 automatically changes the opening degree of the water inlet 40 by the valve body 52 and the amount of water flowing from the water inlet 40 into the mixing chamber 36 and the flow of hot water from the electric water heater 10 into the mixing chamber 36. The ratio of the inflow amount can be adjusted, and the mixed water at a desired temperature can be discharged from the outlet 30.
[0044]
Further, in this example, since the valve body 52 has the valve portion 54 and the valve shaft 56 and changes the opening of the water inlet 40 by reciprocating in the axial direction, the valve body 52 and the entire structure including the same are included. Can be made a simpler structure.
[0045]
Further, the hot water mixing valve 20 of the present embodiment is capable of branching water supplied from a water supply source and supplying the water to the mixing chamber 36 and the electric water heater 10, so that water supplied from the water supply source is connected to the electric water heater as in the related art. There is no need to separately provide a branching portion for branching to the hot water mixing valve outside the hot water mixing valve and connect it to the pipe, and the hot water mixing valve 20 can be directly connected to the electric water heater 10 as it is.
[0046]
Thus, by directly connecting the water / water mixing valve 20 to the electric water heater 10, the electric water heater 10 and the water / water mixing valve 20 can be substantially integrated.
In other words, the electric water heater 10 itself can be configured as having the hot and cold water mixing valve 20, the hot water supply system including the piping can be reduced in size and simplified, and the cost can be reduced. .
[0047]
In the above example, the temperature is adjusted by changing the opening of only the water inlet 40 by the valve portion 54. However, when the water inlet 40 is fully opened, the diameter of the branch water passage 42 to the electric water heater is equal to the water inlet. If the diameter is larger than the diameter of 40, a part of the hot water from the electric water heater 10 flows into the mixing chamber 36 and the water discharge temperature becomes higher than the desired minimum temperature. In order to cope with this, as shown in FIG. 3, a second valve portion 64 is provided which is interlocked with the valve portion 54, and the second valve portion 64 is interlocked with the opening degree of the water inlet 40 at the valve portion 54, and If the second valve portion 64 is configured to change the degree of opening of the branch water channel 42 to a closed state, the branch water channel 42 can be fully closed when the water inflow port 40 is in the fully open state. Hot water can be prevented from flowing into the mixing chamber 36. By doing so, a better temperature control function can be obtained irrespective of the aperture ratio between the water inlet 40 and the branch channel 42.
[0048]
FIG. 4 shows another embodiment of the present invention.
In the figure, reference numeral 22 denotes a casing of the hot and cold water mixing valve 20, which is a water supply port 28, an outlet 30 for mixed water, an internal water supply path 34 formed following the water supply port 28, and partitions the water supply path 34 from the mixing chamber 36. A partition wall 38, a water inlet 40 formed in the partition wall 38, a hot water inlet 44 through which hot water from the electric water heater 10 flows into the mixing chamber 36, and a hot water passage 46 formed upstream of the partition wall 38; It has a branch water passage 42 that branches off from the passage 34 and bypasses water supplied from the water supply port 28 to the electric water heater 10 side.
[0049]
52 is a valve body provided with a valve portion 54 for changing the opening of the water inlet 40 and a valve shaft 56, 66 is a spindle shaft for operating the valve body 52 on the pushing side, and 68 is for rotating the spindle shaft 66. It is a handle.
Here, the spindle shaft 66 has a male screw 70 on the outer periphery, and the male screw 70 is screwed into a female screw 72 formed on the inner peripheral surface of the casing 22. When the handle 68 is rotated, the screw feed is performed in the figure. Move up and down.
[0050]
The valve body 52 is pushed downward in the figure by the spindle shaft 66, that is, in the valve closing direction. However, when the spindle shaft 66 retreats upward in the figure, the opening degree of the water inlet 40 is increased by the feedwater pressure. It is pushed up in the figure.
[0051]
The hot and cold water mixing valve 20 of this example adjusts the position of the valve element 52 by rotating the handle 68, thereby setting the opening of the water inlet 40 by the valve element 52 to an appropriate opening degree. Thus, the mixed water at a desired temperature can be discharged from the outlet 30.
[0052]
The embodiment of the present invention has been described in detail above, but this is merely an example.
For example, in FIGS. 1, 2 and 3, the water / water mixing valve 20 is directly connected to the electric water heater 10, but a connecting pipe connecting them may be interposed between the water / water mixing valve and the electric water heater in some cases. For example, the present invention can be configured in various modified forms without departing from the gist of the present invention.
[Brief description of the drawings]
FIG. 1 is a diagram showing a hot water mixing valve according to one embodiment of the present invention together with an electric water heater.
FIG. 2 is an enlarged view showing an internal structure of the hot and cold water mixing valve of the embodiment.
FIG. 3 is a view showing a hot water mixing valve according to another embodiment of the present invention.
FIG. 4 is a view showing a hot and cold water mixing valve according to still another embodiment of the present invention.
FIG. 5 is a diagram showing a state in which a conventional hot water mixing valve and hot water supply equipment are connected by piping.
FIG. 6 is a view showing an example of a conventional hot and cold water mixing valve of FIG. 5;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Electric water heater 20 Hot water mixing valve 28 Water supply inlet 30 Outlet 34 Internal water supply passage 36 Mixing chamber 38 Partition wall 40 Water inlet 42 Branch water passage 44 Hot water inlet 52 Valve body 54 Valve part 56 Valve shaft 60 Temperature sensitive spring 64 Valve part 2

Claims (5)

A hot water mixing valve that mixes water from a water supply source and hot water from a water heater to flow out,
(A) a mixing chamber for mixing water and hot water; (b) a water supply inlet for inflowing water from a water supply pipe; (c) an internal water supply passage formed following the water supply inlet; A partition wall for partitioning the water supply channel from the mixing chamber; and (e) a water flow provided on the partition wall for communicating the internal water supply channel with the mixing chamber and allowing water from the internal water supply channel to flow into the mixing chamber. An inlet, (f) a hot water inlet for allowing hot water from the water heater to flow into the mixing chamber, (g) a branch water channel that branches off from the internal water supply channel and bypasses water supply to the water heater side, and (h) the hot water. While keeping the inflow port always open, the opening degree of the water inflow port is changed to increase or decrease the amount of water flowing into the mixing chamber from the water inflow port, and to the water heater through the branch waterway. And (i) the mixed water from the mixing chamber, Water heater hot and cold water mixing valve, characterized in that it comprises a outlet for out. 2. The water / water mixing valve according to claim 1, wherein the mixing chamber includes a temperature sensing element in the mixing chamber, the valve element is moved in position by a change in temperature of the temperature sensing element, and an opening of the water inlet is changed. A hot / water mixing valve for a water heater, which is a thermostatic mixing valve for automatically adjusting the temperature of the mixed water. The valve body according to any one of claims 1 and 2, wherein the valve body includes a valve shaft and a valve portion, and the valve portion is moved forward and backward in the axial direction to change the opening of the water inlet. A hot and cold water mixing valve for a water heater. The valve body according to any one of claims 1 to 3, wherein the valve body includes a valve portion that changes an opening degree of the water inflow port and a second valve portion that is integrated with or interlocks with the valve portion. A hot / water mixing valve for a water heater, wherein the second valve portion changes the branch water channel to a closed / open state in conjunction with a change to a closed state; The hot / water mixing valve for a water heater according to any one of claims 1 to 4, wherein the water / water mixing valve is directly connected to the water heater without substantially passing through a pipe.

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