JP3482375B2 - Hot water supply control valve - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control valve for supplying hot and cold water installed on a hot water supply path to, for example, a shower facility in a bathroom. The present invention relates to a hot / water supply control valve that can always supply mixed water of cold water within a predetermined set temperature range. 2. Description of the Related Art Generally, in a hot water supply system such as a shower facility, a mixture of hot and cold water from a water heater set to a desired appropriate temperature is supplied through a hot water supply path. [0003] However, in such a conventional hot water supply system, the difference in hot water supply temperature between summer and winter is severe. Particularly in winter, mixed water from the hot water supply system is used. Since the water is cooled while flowing through the hot water supply path and becomes cold water having a temperature equal to or lower than a predetermined set temperature, it may come out of the shower, thereby giving a feeling of discomfort to the human body. In addition, if the mixing of the cold water into the hot water becomes impossible due to a failure of the mixing faucet at the time of the shower, for example, abnormally high temperature hot water at a predetermined temperature or higher may come out of the shower, and thus, a burn or the like may occur. Poses a serious danger. The present invention has been made in view of the above circumstances, and has as its object to provide a hot water supply control valve which can always supply hot water and cold water within a predetermined set temperature range. I do. In order to achieve the above-mentioned object, the present invention is to provide a hot water / cold water mixed water supply path.
And has a hot water inlet 1A at one end and hot water at the other end.
A first on-off valve on the upstream side in a valve body 1 having an outlet 1B.
10 and the second on-off valve 20 on the downstream side are arranged in series,
Due to the mutual operation of the closing valves 10 and 20, mixing within the set temperature range is achieved.
Flow the mixed water to the hot and cold water outlet 1B side, and mix water below the set temperature.
Is the upstream (for cold water) drain opening on the wall of the valve body 1
3 to the drain tube 2 and mix water above the set temperature
Is the downstream (for hot water) drain opened on the wall of the valve body 1
For hot and cold water supply that flows to the drain pipe 2 through the port 7
The first on-off valve 10 on the upstream side, which is a control valve, is a split valve.
The upstream (for cold water) drain port 3 is closed by the ring 12
A first movable valve body 11 urged to open a valve
Valve mechanism and the temperature of mixed water above a predetermined low-level set temperature.
The wax-type thermo-responsive expansion and contraction device A is spring
By expanding overcoming the action of No. 15, the spring 1
The drain port 3 is closed by the spring 12 weaker than 5.
The valve seat between the cylindrical movable valve element 11 that operates to
The movable valve body 14 provided as described above,
Wax due to mixed water temperature below low level set temperature
With the shrinkage of the thermal expansion / contraction device A, the spring 15
While closing the valve seat between the cylindrical movable valve element 11 by the force,
In conjunction with the valve closing operation, a cylindrical shape is formed against the spring 12.
Upstream side (for cold water) leading to the movable valve element 11 and the drain pipe 2
A movable valve element 14 connected to open the drain port 3
And a second opening and closing on the downstream side.
The valve 20 adjusts the temperature of the mixed water above a predetermined high level set temperature.
The heat-sensitive urging element 23 made of a responsive shape memory alloy spring is extended.
By the long operation, the cylindrical valve body 25 closes the hot and cold water outlet 1B.
Valve and downstream side to drain pipe 2 (for hot water)
Movable integral with the cylindrical valve body 25 that opens the drain port 7
A third valve mechanism including the valve element 21 and a predetermined high level setting
The heat-sensitive urging element 23 shrinks in response to the temperature of the mixed water below the temperature.
The small movement allows the hot and cold water flow due to the action of the spring 26.
The outlet 1B is opened, and the movable valve element 21 is moved downstream.
(For hot water) Drain port 7 is provided integrally so as to close the valve
It is characterized by being constituted by a fourth valve mechanism comprising a cylindrical valve body 25 . That is, according to the present invention, by adopting the above-described structure, when the mixed water flowing from the hot water inlet side of the valve body is within a predetermined set temperature range, the first valve mechanism and the first valve mechanism are provided. The second valve mechanism is operated, and the mixed water having an appropriate temperature flows out of the hot water outlet. Further, when the mixed water is below the predetermined set temperature range, the first valve mechanism keeps the valve open, the second valve mechanism keeps the valve closed, and the mixed water flows from the upstream drain port to the outside of the valve body. As a result, cold water does not flow out of the hot and cold water outlet side. On the other hand, if the temperature of the mixed water is equal to or higher than the predetermined temperature range, the third valve mechanism and the fourth valve mechanism operate, and the mixed water is discharged from the downstream drain port to the outside of the valve body. In addition, there is no danger that hot water having an abnormally high temperature as in the past flows out of the hot water outlet. Further, the opening and closing operation of the first valve mechanism and the second valve mechanism is performed by a combination of expansion / contraction action of the heat-sensitive expandable body made of wax with a change in temperature of the mixed water.
Since the opening and closing operations of the third valve mechanism and the fourth valve mechanism are performed by a combination of the expansion / contraction action caused by the temperature change of the mixed water of the heat-sensitive urging body made of the shape memory alloy spring, the responsiveness is improved, In addition, the entire valve mechanism is structurally simplified. Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing the entire configuration of a hot water supply control valve, and FIG. 2 is a plan view. That is, the hot water supply control valve according to the present invention is, for example, a valve body 1 installed on a hot water supply path of a mixed water W of hot water and cold water from a water heater to a shower facility in a bathroom or the like.
And a drainage passage connected to a cylindrical drainage receiver 2a having a drainage receiving chamber provided so as to be fitted and locked in a locking groove and a locking step formed on the outer periphery of the valve body 1, and communicating with the outside. And a drain tube 2. The valve body 1 includes an upper cylindrical casing 1C.
The female screw portion on the upper part of the lower cylindrical casing 1D is screwed and connected in series to the lower male screw portion of the valve main body 1 and the valve main body 1 is provided with connecting screw portions at both ends thereof. A first opening / closing valve 10 on the upstream side, which is opened / closed according to the temperature of the mixed water W flowing from one hot water inlet 1A to the other hot water outlet 1B, and a second opening / closing downstream Valve 20
Having. An upstream first on-off valve 10 is connected to an upstream chilled water drain port 3 provided in an upper casing 1C which communicates with a drain pipe 2 connected to a cylindrical drain receiver 2a provided on the outer peripheral surface of the valve body 1. , Which can be opened and closed and slidable in a liquid-tight manner on the upper casing 1C, and the cylindrical movable valve 11 is slidably slidable in the axial direction of the valve body 1 in the normally closed direction. And a spring 12 composed of a compression coil spring. The upstream peripheral edge of the upstream cylindrical movable valve body 11 is also used as a stopper which is screwed into an upstream female screw portion in the valve body 1 by the urging force of a spring 12 and also serves as a stopper. By contacting the lower surface of the valve seat 4, the cold water drain port 3 can be closed. The first valve mechanism includes the tubular valve seat 4, the tubular movable valve body 11, and the spring 12. Is composed. An annular valve seat 13 which rises in a short tubular shape in the downstream direction integrally with the inward flange 11a is integrated with the downstream peripheral edge of the cylindrical movable valve body 11 constituting the first valve mechanism. The annular valve seat 13 is provided with a ring-shaped valve element 14 having an annular contact surface on the lower surface on the downstream side diverging toward the upstream side. One end (inner annular flat portion) of the ring-shaped valve element 14 has a cylindrical valve seat 4.
Is always pressed downstream by a spring 15 composed of a compression coil spring assembled inside the upper end of the annular valve seat 13, and is constantly urged in the valve closing direction with respect to the annular valve seat 13. The urging force (spring constant) of the spring 15 is
Is greater than the urging force (spring constant) of the spring 12 that urges the cylindrical movable valve element 11 against the urging force of the spring 12 to open the chilled water drain port 3. We are urging them to maintain. The annular valve seat 13, the ring-shaped valve element 14, and the spring 15 constitute a second valve mechanism. Further, the ring-shaped valve element 14 is provided with a cap-shaped container 16, and an annular locking step 16 a is provided on an outer surface of an intermediate portion of the container 16. The ring-shaped valve element 14 is inserted from the downstream side toward the upstream side, and is engaged with the locking step to lock the ring-shaped valve body 14. A flexible elastic sleeve 17 with a flange is inserted. The elastic sleeve 17 is fixed to the container 16 via a sealing member 18 so as to maintain a sealed state, and a sealed space S formed by the container 16 and the elastic sleeve 17 has a wax as a thermal expansion means. Is filled with the heat-sensitive expander F, and a wax-type thermally responsive expansion / contraction device A for pushing or pulling the plunger 19 is constituted. A plunger 19 is provided inside the elastic sleeve 17.
The plunger 19 is slidably held in the axial direction of the valve body 1 via a sealing member 18, and a downstream end thereof is provided with hot and cold water provided on the downstream side of the valve body 1. It is locked in a locking groove 6a of a holding member 6 fixed to a disk-shaped annular support plate 5 having an introduction hole. On the other hand, the downstream second on-off valve 20 is a tubular movable valve body capable of closing the hot water drain port 7 communicating with the drain pipe 2 provided outside the valve body 1 and extending to the downstream side. 21. The movable valve body 21 has a form of a two-stage tubular body having a wide and narrow width, and a large-diameter tubular portion 21a on the upstream side.
Is fitted to the inner peripheral surface of the lower casing 1D so as to be slidable in a liquid-tight manner, and an inwardly directed annular flange 21b is integrally bent and connected to an intermediate portion of the tubular movable valve body 21; A small-diameter cylindrical portion 21c is formed concentrically and bent integrally on the inner diameter side of the inner diameter 21b, and an annular flange 21d is formed integrally and bent inward at a downstream end of the small-diameter cylindrical portion 21c. A lower part of a heat-sensitive urging member 23 formed of a compression spring of a coil-shaped shape memory alloy spring is engaged with the upper surface, and an upper part of the heat-sensitive urging member 23 is provided at an inner intermediate portion of the cylindrical valve body 1. And is engaged with a support flange 8a of a cylindrical support member 8 with a flange, which is arranged concentrically. The movable valve body 21 is slidably fitted to the middle inner peripheral surface of the lower casing 1D in a liquid-tight manner, and the upper end of the movable valve body 21 is engaged with the lower end surface of the upper casing 1C. By doing so, it is prevented from moving in the upstream direction, and before the lower surface of the annular flange 21b engages with the middle inward step 27 in the lower casing 1D, the distal end of the cylindrical valve body 25 is It is set to sit on. A peripheral wall near the lower surface of the lower casing 1D joined to the upper casing 1C, and a plurality of downstream drain ports (drain ports for hot water) 7 spaced apart in the circumferential direction at positions close to the lower end face of the upper casing 1C. It is provided in. Therefore, immediately after the cylindrical movable valve element 21 is separated from the lower surface of the upper casing 1C, the high-temperature mixed water having a predetermined temperature or higher can be discharged from the downstream drain port 7 communicating with the outside. One end of a cylindrical support member 8 is fixed to the downstream side of the support plate 5 having the hot and cold water supply holes by welding or the like, and an annular support projecting outward in the radial direction is provided downstream of the cylindrical support member 8. A flange 8a is provided, and the bearing flange 8 is provided.
A heat-sensitive urging element 23 as a heat-sensitive responsive means composed of a compression coil spring of a shape memory alloy spring is provided between a and the inward annular flange 21d of the cylindrical movable valve element 21. The valve body 1 is attached to the inwardly directed annular flange 21b.
Water inlet 2 communicating with the hot water outlet 1B at the downstream end of the
2 are provided. That is, the movable valve element 21 is a heat-sensitive responsive means assembled via a cylindrical support member 8 with a flange fixed at one end to the lower surface of the annular support plate 5 having a hot water supply hole by welding or the like. As a result of the rapid expansion operation accompanying the heat-sensitive response of the heat-sensitive urging body 23 composed of the compression coil spring 23 of the shape memory alloy spring, the valve body 1 is slidably urged in the valve opening direction along the axial direction. And the abrupt downstream movement of the cylindrical valve body 25 causes the annular valve seat 9 to move.
Is configured to be closed. The movable valve body 21, the hot and cold water inlet 22, and the heat-sensitive urging body 23
Of the valve mechanism. Further, the second on-off valve 20 has a cylindrical guide member 24 whose one end is fixed to the support member 8 or the holding member 6 by welding or the like and extends in the axial direction downstream of the valve body 1. The tubular guide member 24 includes a heat-sensitive urging element 23.
The upper end of a cylindrical valve body 25 slidable in the axial direction of the valve body 1 in a liquid-tight manner in coordination with the elongating operation accompanying the heat-sensitive response of The annular distal end portion 25a having an arcuate cross section on the side is provided at the downstream end of the valve body 1 at the hot and cold water outlet 1.
B, the upstream inward flange 25b of the cylindrical valve body 25 is maintained so as to maintain the valve-open state with respect to the annular valve seat 9 formed in B.
And outward flange 24 of the cylindrical guide member 24
a is always urged by the urging force of a spring 26 composed of a compression coil spring disposed between the helical springs. The cylindrical guide member 24, the cylindrical valve body 25 and the spring 2
6 constitutes a fourth valve mechanism. By the way, the wax-type thermally responsive expansion / contraction device A provided with the wax F as the thermal expansion means filled in the closed space S between the container 16 and the elastic sleeve 17 constituting the first on-off valve 10 described above. For example, the plunger 19 due to the expansion of the wax when the temperature of the mixed water W is 30 ° C. or less.
In the relative movement in the downstream direction of the container 16 due to the amount of extrusion extension, the cylindrical movable valve body 11 moves together, so that the annular valve body 14 and the annular valve seat 13 maintain the closed state, and at 30 ° C. or more, The annular valve element 14 and the annular valve seat 13 are set so as to separate from each other to be in an open state. Further, the heat-sensitive urging element 23 composed of a compression coil spring 23 of a shape memory alloy spring as a heat-sensitive responsive means constituting the second on-off valve 20 may, for example, extend when the temperature of the mixed water W is 50 ° C. or less. Without
It is set to perform rapid extension operation at 50 ° C. or more,
A shape memory alloy spring set to automatically return to the original state at a temperature lower than ℃ is used. Next, the control operation of the hot water supply control valve according to the present invention based on the hot water temperature will be described with reference to the drawings shown in FIGS. Note that when the mixed water W is not flowing in the hot water supply path, or when the mixed water (cool water: for example, 30 ° C. or less) W remaining in the hot water supply path and having a predetermined temperature range or less flows, the initial state of hot water supply is assumed. Sometimes, as shown in FIG. 1, the first valve mechanism of the first on-off valve 10 keeps the valve open and the second valve mechanism keeps the valve closed, while the second on-off valve 20 is closed. The third valve mechanism is maintained in a closed state, and the fourth valve mechanism is maintained in an open state. As a result, the mixed water W having a temperature equal to or lower than the predetermined temperature range is drained from the cold water drain port 3 to the outside of the valve body 1 through the drain pipe 2 as shown by a solid line arrow. In this state, a temperature within a predetermined set temperature range (30 ° C. or higher) from the hot water inlet 1 A on the upstream side of the valve body 1.
When the mixed water W flows in, the container 16 and the elastic sleeve 17
The wax F in the wax-type thermally responsive expansion and contraction device A filled in the sealed space S expands by a predetermined amount, and as shown in FIG. Then, the plunger 19 is extended so as to be pushed out toward the downstream side. However, since the downstream end of the plunger 19 is fitted and locked to the holding member fixed to the annular support plate 5 provided on the downstream side of the valve body 1, the reaction force is relatively large with respect to the container 16. As a result, the container 16 is forcibly moved toward the upstream side against the urging force of the spring 15. When the container 16 is forcibly moved to the upstream side,
The balanced state of the spring 12 for urging the cylindrical movable valve body 11 and the spring 15 for urging the ring-shaped valve body 14 of the annular valve seat 13 to the closed state is released, and the cylindrical movable valve body 11 is opened.
Is moved to the upstream side by the urging force of the spring 12, and its upstream peripheral edge abuts on the downstream peripheral edge of the cylindrical valve seat 4, and at the same time, closes the drain port 3 for cold water. At this time, the ring-shaped valve element 14 maintains the closed state with respect to the annular valve seat 13 by the urging force of the spring 15. When the cold water drain port 3 is closed by the cylindrical movable valve body 11 and the wax-type thermally responsive expansion and contraction device A is further extended by the temperature of the mixed water W, as shown in FIG. Also forcibly moves toward the upstream side, and forcibly moves the ring-shaped valve body 14 toward the upstream side against the urging force of the spring 15. At this time, the cylindrical movable valve element 11
Is in contact with the downstream peripheral edge of the cylindrical valve seat 4 and the annular valve seat 13 does not move, so that only the ring-shaped valve element 14 is forcibly directed upstream. Moving. Due to the valve-opening operation of the ring-shaped valve body 14, the mixed water W at an appropriate temperature (30 ° C. or higher) within a predetermined set temperature range flowing from the hot water inlet 1A on the upstream side of the valve body 1 is shown by a solid line in FIG. As shown by the arrow, the annular support plate 5 flows out of the hot water outlet 1B of the valve body 1 through the hot water inlet 22 of the movable valve body 21 constituting the third valve mechanism of the second on-off valve 20, and is not shown. Hot water is supplied to shower facilities and the like. On the other hand, in such a hot water supply state, abnormally high temperature hot water (hot water: for example, 50 ° C. or more) W equal to or higher than a predetermined set temperature due to a failure of the mixing faucet, etc. When the air flows from the inlet 1A, as shown in FIG. 5, a heat-sensitive urging element 23 formed of a compression coil spring of a shape memory alloy spring constituting a third valve mechanism of the second on-off valve 20 operates. The movable valve element 21 moves toward the downstream side of the valve body 1 by the extension operation accompanying the heat-sensitive response of the heat-sensitive urging element 23, and the hot water drain port 7 is opened.
The cylindrical valve body 25 that constitutes the fourth valve mechanism includes a spring 2
6 rapidly moves toward the downstream side of the valve body 1 against the urging force of 6, and closes the annular valve seat 9 formed at the hot and cold water outlet 1B.
As a result, as shown by the solid line arrow in FIG. 5, the abnormally high temperature hot water W flowing from the hot water inlet 1A of the valve main body 1 through the hot water inlet 1A passes through the drain pipe 2 for hot water through the drain pipe 2. As a result, the water is drained out of the valve body 1 and shuts out from the hot water outlet 1B of the valve body 1. By the way, in the hot water supply state at an appropriate temperature by the first opening / closing valve 10 shown in FIG. 4, mixed water W having a predetermined temperature range or less is supplied from the hot water inlet 1A on the upstream side of the valve body 1.
When the temperature of the mixed water W remaining in the valve main body 1 falls below a predetermined set temperature range due to the flow of hot water or the stop of hot water supply, the thermal expansion body constituting the first on-off valve 10 (Wax) F shrinks, and the container 16
The plunger 19 relatively moves down due to the urging force described above. As a result, the annular valve seat 13 is closed by the ring-shaped valve body 14 and shuts off the inflow of the mixed water W having a predetermined temperature range or less to the downstream side. When the temperature of the mixed water W decreases, the wax F shrinks, and the plunger 19 in the wax-type thermally responsive expansion / contraction device A engages with the container 16 so that the compression coil spring 15 having a large spring constant relatively rotates the container. 16, whereby the cylindrical movable valve body 11 moves downstream against the urging force of the spring 12 smaller than the spring constant of the compression coil spring 15, and its upstream peripheral edge is cylindrical. Separate from the downstream peripheral edge of the valve seat 4,
To maintain the hot water supply initial standby state as shown in FIG. In the shut-off state of the second on-off valve 20 due to the inflow of the abnormally high-temperature hot water W shown in FIG. 5, the inflow of the abnormally high-temperature hot water W is stopped and the mixed water W flowing into the valve body 1 is stopped. When the temperature has reached the appropriate temperature, the movable valve element 21 moves toward the upstream side of the valve body 1 by the contraction operation accompanying the heat-sensitive transformation of the heat-sensitive urging element 23, and closes the hot water drain port 7. At the same time, the cylindrical valve body 25 also moves toward the upstream side of the valve body 1 by the urging force of the spring 26, and
Is opened. This enables a hot water supply state at an appropriate temperature as shown in FIG. In the above-described embodiment of the present invention, the wax-type thermally responsive expansion and contraction device A provided with wax constituting the first on-off valve 10 and the shape memory alloy spring constituting the second on-off valve 20 The operating temperature of the heat-sensitive urging element 23 composed of a compression coil spring is appropriately set according to the use environment and use conditions. As described above, the control valve for hot and cold water supply according to the present invention provides the first control valve when the mixed water flowing from the hot water inlet side of the valve body is within a predetermined set temperature range. The valve mechanism and the second valve mechanism are operated, and the mixed water at the appropriate temperature flows out of the hot water outlet, so that the hot water supply at the appropriate temperature can be reliably performed. When the temperature of the mixed water is equal to or lower than the predetermined temperature range, the first valve mechanism keeps the valve open, the second valve mechanism keeps the valve closed, and the mixed water flows through the upstream drain port from the upstream drain port. Since the water is drained to the outside of the main body, cold water having a temperature equal to or lower than a predetermined set temperature as in the past is not supplied, and therefore, no discomfort is given to the human body. On the other hand, if the temperature of the mixed water is higher than the predetermined temperature range, the third valve mechanism and the fourth valve mechanism are operated, and the mixed water is discharged from the downstream drain port to the outside of the valve body. Therefore, the abnormally high temperature hot water does not flow out from the hot water outlet side as before, and there is no danger of causing serious danger such as burns. Further, the opening and closing operations of the first valve mechanism and the second valve mechanism are performed by a combination of expansion / contraction actions caused by a change in the temperature of the mixed water of the thermal expansion body made of wax.
The opening and closing operations of the third valve mechanism and the fourth valve mechanism are performed by a combination of a rapid expansion / reduction action caused by a temperature change of the mixed water of the heat-sensitive urging body composed of a compression coil spring of a shape memory alloy spring. Therefore, the responsiveness of the valve mechanism can be improved, and the overall structure of the valve mechanism can be simplified, and malfunction can be reliably prevented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a vertical sectional side view showing a valve closing configuration of a hot water supply control valve according to the present invention at the time of initial hot water supply standby. FIG. 2 is a plan view showing an embodiment of a hot water supply control valve. FIG. 3 is a vertical sectional side view showing a state in which the hot / water supply control valve is in the middle of operation when hot water is supplied. FIG. 4 is a vertical sectional side view showing a hot water supply state at an appropriate temperature of a hot water supply control valve. FIG. 5 is a vertical sectional side view showing an operating state of the hot water supply control valve when hot water flows in the same. [Description of Signs] 1 Valve body 1A Hot and cold water inlet 1B Hot and cold water outlet 1C Upper cylindrical casing 1D Lower cylindrical casing 2 Drain pipe (drainage passage) 2a Cylindrical drainage receiver 3 Upstream drain port (cold water drain port) 4 Cylindrical valve seat 5 Annular support plate 6 Holding member 7 Downstream drain port (drain port for hot water) 8 Support member 8a Bearing flange 9 Annular valve seat 10 First open / close valve 11 Movable valve body 11a Flange 12 Spring 13 Annular valve Seat 14 Ring-shaped valve element 15 Spring 16 Container 16a Annular locking step 17 Elastic sleeve 18 Sealing member 19 Plunger 20 Second opening / closing valve 21 Movable valve element 21a Large-diameter cylindrical part 21b Inward annular flange 21c Small-diameter cylindrical Part 21d Inward annular flange 22 Hot water inlet 23 Heat-sensitive urging element 24 Cylindrical guide member 24a Outward flange 25 Cylindrical valve body 25 Annular tip 25b inward flange 26 spring 27 intermediate portion facing stepped portions A wax-type thermally responsive expansion device F thermal expansion body (wax) S sealed space W mixed water

Claims (1)

(57) [Claims] [Claim 1] Installed on a mixed water supply path of hot water and cold water
Has a hot water inlet 1A at one end and a hot water inlet at the other end.
A first on-off valve 1 on the upstream side is provided in a valve body 1 having an outlet 1B.
0 and the second on-off valve on the downstream side are arranged in series, and both on-off valves 1
By the mutual operation of 0 and 20, mixed water within the set temperature range
Flow to the hot water outlet 1B side, mixed water below the set temperature is a valve
Through the drain port 3 on the upstream side (for cold water) established on the wall of the body 1
Into the drain pipe 2 and mix water above the set temperature.
The downstream (for hot water) drain port 7 opened on the wall of the main body 1
Control valve for supplying hot and cold water that flows through the drain pipe 2
A is, the first on-off valve 10 on the upstream side, the upstream side by a spring 12 (for cold water) drain port
3 from the cylindrical movable valve body 11 urged to close the valve.
A first valve mechanism that is sensitive to the temperature of the predetermined low level set temperature or more mixing water
Wax-type thermo-responsive expansion and contraction device A works with spring 15
By overcoming and expanding, weaker than spring 15
Operates to close the drain port 3 by the spring 12
Provided to open a valve seat between the cylindrical movable valve element 11
The movable valve body 14 is further provided with a predetermined low-level setting.
Wax-type thermo-responsive expansion and contraction with mixed water temperature below a certain temperature
As the device A shrinks, it can be cylindrical with the resilience of the spring 15
A valve seat between the valve body 11 and the valve closing operation is performed.
, The cylindrical movable valve element 11 against the spring 12
Upstream (for cold water) drain port 3 leading to drain pipe 2
A movable valve body 14 connected so as to open the valve.
The second on- off valve 20 on the downstream side is configured to respond to the temperature of the mixed water at a predetermined high level set temperature.
The heat-sensitive urging member 23 made of a shape memory alloy spring performs an extension operation.
Thus, when the cylindrical valve body 25 closes the hot and cold water outlet 1B,
At the downstream (for hot water) drain port leading to the drain pipe 2
The movable valve element 21 integral with the cylindrical valve element 25 that opens the valve 7
A Ranaru third valve mechanism, and responsive to a predetermined temperature of the high level setting temperature following mixed water
When the heat-sensitive urging element 23 is contracted, the spring 26
The hot water outlet 1B is opened by the action of
The valve body 21 closes the downstream (for hot water) drain port 7.
Valve mechanism composed of a cylindrical valve body 25 integrally provided as described above
A hot and cold water supply control valve characterized by comprising: