JP2009156426A - Switching valve and water tank piping system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a switching valve which can reduce the number of parts necessary to constitute a piping system. <P>SOLUTION: The switching valve has a first port 54, a second port 56, a valve housing 52 with a third port 58, and a valve body 60 which is arranged in the valve housing 52 so as to be turnable and switches five communicating states in each port according to a turned position. Thus, the number of the parts necessary to constitute the piping system can be reduced by employing the switching valve 50. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a switching valve for switching a flow path and a water tank piping system using the switching valve.

  In condominiums, tenant buildings, factories, commercial facilities, etc., water tanks for storing drinking water, middle water and the like are installed. When such a water tank is installed, it is necessary to provide means for preventing secondary disasters and securing water for daily life by shutting off the flowing water from the water tank when the piping of the building is damaged in the event of a disaster such as an earthquake. Conventionally, as this means, an emergency shut-off valve (see, for example, Patent Documents 1 to 3) that quickly detects vibration and automatically closes the pipe in the vicinity of the outlet of the water tank has been provided.

By the way, in a relatively large water tank (for example, a large panel water tank), a plurality of water storage chambers are formed, and maintenance such as cleaning is performed in some water storage chambers while normal operation is performed in the remaining water storage chambers. There are many. As this water tank piping system, for example, there is a water tank piping system 100 shown in FIG. 11. In this water tank piping system 100, a water storage chamber 84 of a water tank 88 having water storage chambers 84 and 86 partitioned by a partition wall 82. 86, two-way valve type emergency shut-off valves 90, 92 are provided in the vicinity of the outlets, respectively, and a communication pipe 96 for communicating the water storage chambers 84, 86 on the side opposite to the side where the emergency shut-off valves 90, 92 are provided. And a two-way valve type on-off valve 98 for opening and closing the communication pipe 96 is provided. As described above, in order to configure the aquarium piping system 100, the aquarium 88, the two emergency shutoff valves 90 and 92, the communication pipe 96, and the on-off valve 98 are required. Therefore, it is desired to improve the cost by reducing the number of parts.
JP-A-6-265032 JP 2002-206652 A JP 2004-176855 A

  In view of the above facts, an object of the present invention is to provide a switching valve capable of reducing the number of parts required for the configuration of the piping system, and a water tank piping system using the switching valve.

  In order to achieve the above object, a switching valve according to claim 1 is provided with a valve housing having a first port, a second port, and a third port, and is rotatably disposed in the valve housing. An all-communication state in which the first port, the second port, and the third port are all opened and communicated according to a rotation position, the first port, the second port, and An all-closed state in which all the third ports are closed; a first two-way communication state in which only the first port and the second port are open and communicated; and the first port and the third port And a valve body that switches between a second two-way communication state in which only the port is open and communicates, and a third two-way communication state in which only the second port and the third port are open and communicate with each other. It is characterized by that.

  In the switching valve according to the first aspect, the communication states of the first port, the second port, and the third port are switched according to the rotation position of the valve body. Here, in the communication state of the first port, the second port, and the third port, the first port, the second port, and the third port are all opened and communicated in the all communication state. In the all-closed state (non-communication state), the first port, the second port, and the third port are all closed, and in the first two-way communication state, only the first port and the second port are opened. In the second two-way communication state, only the first port and the third port are opened and communicated, and in the third two-way communication state, only the second port and the third port are opened and communicated. To do. In other words, the switching valve of the present invention is configured so that the communication state of the three ports is switched to five states according to the rotation position of the valve body, so that, for example, a piping system is configured using a plurality of two-way valves. Rather than this, a piping system having the same function can be configured with a small number of parts. As a result, the switching valve of the present invention can improve the cost by reducing the number of parts necessary for the configuration of the piping system.

  According to a second aspect of the present invention, in the switching valve according to the first aspect, the outer peripheral portion of the valve body closes the first port, the second port, and the third port. It is a feature.

  In the switching valve according to the second aspect, the first port, the second port, and the third port are closed by the outer peripheral portion of the valve body.

  The switching valve according to claim 3 is the switching valve according to claim 1 or 2, wherein the valve body is hemispherical or semi-cylindrical.

  In the switching valve according to the third aspect, since the valve body is hemispherical or semi-cylindrical, the structure of the valve body is simple.

  The water tank piping system according to claim 4 is a water tank having a plurality of water storage chambers, a switching valve according to any one of claims 1 to 3 disposed on the outside of the water tank, A first inflow line connecting the water storage chamber and the first port of the switching valve; a second inflow line connecting the other water storage chamber and the second port of the switching valve; and a third port of the switching valve. And a water intake line connected to the main body.

In the water tank piping system according to claim 4, one water storage chamber and the first port of the switching valve are communicated with each other by a first inflow line, and the other water storage chamber and the second port of the switching valve are connected by a second inflow line. Communicated. A water intake line is connected to the third port. Here, by rotating the valve body of the switching valve arranged outside the water tank, the communication state of the first port, the second port, and the third port according to the rotational position of the valve body Are switched to five states. The first port, the second port, and the third port are all open and communicated in all communication states among the five communication states of the first port, the second port, and the third port. One water storage chamber, the other water storage chamber, and the water intake line communicate with each other, and normal operation (water intake) can be performed using one water storage chamber and the other water storage chamber. In the fully closed state, the first port, the second port, and the third port are all closed, so that the outflow of fluid from the water intake line is prevented, and between one water storage chamber and the other water storage chamber. Movement of the fluid is blocked. In the first two-way communication state, only the first port and the second port are opened and communicated, so that one water storage chamber communicates with the other water storage chamber, and one water storage chamber and the other water storage chamber are connected to each other. Fluid movement between is permitted. Moreover, since the 3rd port is closed, the outflow of the fluid from a water intake line is prevented. In the second two-way communication state, only the first port and the third port open and communicate with each other, so that one water storage chamber communicates with the intake line. In addition, since the second port is closed, normal operation (water intake) can be performed using one of the water storage chambers while performing maintenance such as cleaning in the other water storage chamber. In the third two-way communication state, only the second port and the third port are opened to communicate with each other, so that the other water storage chamber communicates with the water intake line. Further, since the first port is closed, it is possible to perform normal operation (water intake) using the other water storage chamber while performing maintenance such as cleaning in one water storage chamber.
Here, when the aquarium piping system of the present invention and a conventional aquarium piping system (a piping system using a two-way valve type emergency shut-off valve) are compared, the aquarium piping system of the present invention is located at the rotational position of the valve body. Accordingly, since a switching valve that can switch the communication state of the three ports to five states is used, the number of parts (mainly the number of valves) can be reduced as compared with the conventional water tank piping system. That is, the aquarium piping system of the present invention can improve the cost by reducing the number of parts compared to the conventional aquarium piping system.

  The water tank piping system according to claim 5 includes a water tank having a plurality of water storage chambers, and the switching valve according to any one of claims 1 to 3 disposed in one of the water storage chambers. The first port of the switching valve communicates with the one water storage chamber, the second port of the switching valve communicates with the other water storage chamber, and the third port of the switching valve is provided outside the water tank. It is connected to the intake line.

In the aquarium piping system according to claim 5, the first port of the switching valve is communicated with one water storage chamber, and the second port is communicated with the other water storage chamber. A water intake line is connected to the third port. Here, the first port, the second port, and the third port communicate with each other according to the rotation position of the valve body by rotating the valve body of the switching valve disposed in one of the water storage chambers. The state is switched to five states. The first port, the second port, and the third port are all open and communicated in all communication states among the five communication states of the first port, the second port, and the third port. One water storage chamber, the other water storage chamber, and the water intake line communicate with each other, and normal operation (water intake) can be performed using one water storage chamber and the other water storage chamber. In the fully closed state, the first port, the second port, and the third port are all closed, so that the outflow of fluid from the water intake line is prevented, and between one water storage chamber and the other water storage chamber. Movement of the fluid is blocked. In the first two-way communication state, only the first port and the second port are opened and communicated, so that one water storage chamber communicates with the other water storage chamber, and one water storage chamber and the other water storage chamber are connected to each other. Fluid movement between is permitted. Moreover, since the 3rd port is closed, the outflow of the fluid from a water intake line is prevented. In the second two-way communication state, only the first port and the third port open and communicate with each other, so that one water storage chamber communicates with the intake line. In addition, since the second port is closed, normal operation (water intake) can be performed using one of the water storage chambers while performing maintenance such as cleaning in the other water storage chamber. In the third two-way communication state, only the second port and the third port are opened to communicate with each other, so that the other water storage chamber communicates with the water intake line. Further, since the first port is closed, it is possible to perform normal operation (water intake) using the other water storage chamber while performing maintenance such as cleaning in one water storage chamber.
Here, when the aquarium piping system of the present invention and a conventional aquarium piping system (a piping system using a two-way valve type emergency shut-off valve) are compared, the aquarium piping system of the present invention is located at the rotational position of the valve body. Accordingly, since a switching valve that can switch the communication state of the three ports to five states is used, the number of parts (mainly the number of valves) can be reduced as compared with the conventional water tank piping system. That is, the aquarium piping system of the present invention can improve the cost by reducing the number of parts compared to the conventional aquarium piping system.
Furthermore, since the switching valve is arrange | positioned in one water storage chamber, the installation space of a water tank becomes compact.

  The aquarium piping system according to claim 6 is the aquarium piping system according to claim 4 or 5, wherein an actuator for rotating the valve body of the switching valve is provided.

  In the aquarium piping system according to claim 6, the actuator rotates the valve body of the switching valve.

  As described above, according to the switching valve of the present invention, the number of parts necessary for the configuration of the piping system can be reduced. And according to the water tank piping system of this invention, a number of parts can be reduced compared with the past, and a cost side can be improved.

(First embodiment)
(Configuration) Next, a first embodiment of an aquarium piping system to which the switching valve of the present invention is applied will be described with reference to FIGS. As shown in FIG. 1, a water tank piping system 10 according to the present embodiment includes a water tank 18 in which two water storage chambers 14 and 16 are formed by a partition wall 12, and a switching valve 50 disposed outside the water tank 18. And.

  As shown in FIG. 2, the switching valve 50 includes a valve housing 52 in which a hemispherical valve body 60 is rotatably housed (valve chamber 52 </ b> A). The valve housing 52 is formed with three openings (a first port 54, a second port 56, and a third port 58), and the outer edges of the valve housing 52 are formed from the respective edges of the three openings. A cylindrical pipe part (first pipe part 64, second pipe part 66, and third pipe part 68) extending in the direction is formed. At the tip of the pipe part, a pipe connecting flange part (first flange part 64F, second flange part 66F, and third flange part 68F) extending to the outer peripheral side of the pipe part is formed. . A bolt hole (not shown) is formed in the flange portion, and a flange portion of a pipe described later is connected by a bolt or the like. Further, in the present embodiment, as shown in FIG. 2, the first piping portion 64, the second piping portion 66, and the third piping portion are viewed in a cross section in a direction orthogonal to the rotation axis direction of the valve body 60. However, the present invention need not be limited to this configuration, and even if the configuration is a Y-shape, other shapes may be used. It may be configured to be arranged.

  The valve body 60 is provided with a columnar rotation shaft portion 62 that rotatably holds the valve body 60. One end portion 62 </ b> A extends outward through the valve housing 52, and the other end portion (not shown) of the rotation shaft portion 62 is fitted in a recess provided on the inner wall of the valve housing 52. A handle 63 for performing an operation for rotating the rotation shaft portion 62 is provided at one end portion 62 </ b> A of the rotation shaft portion 62. By rotating the handle 63, the rotation shaft portion 62 rotates, and the valve body 60 rotates in the valve chamber 52A with the rotation shaft portion 62 as a rotation shaft. The outer peripheral portion 60 </ b> A of the valve body 60 is large enough to block each port (the first port 54, the second port 56, and the third port 58) according to the rotational position of the valve body 60. In this embodiment, each port is closed by the outer peripheral surface as the outer peripheral portion 60 </ b> A of the valve body 60.

Further, the valve body 60 is set so that the communication state of the first port 54, the second port 56, and the third port 58 can be switched to five states according to the rotation position of the valve body 60. ing. The five communication states of the switching valve 50 are shown in (1) to (5) below.
(1) FIG. 2 shows all communication states of each port. In this all-communication state, the first port 54, the second port 56, and the third port 58 are all open and communicated.
(2) FIG. 3 (A) and FIG. 3 (B) show the fully closed state of each port. In this fully closed state, the first port 54, the second port 56, and the third port 58 are all closed.
(3) FIG. 4 shows the first two-way communication state of each port. In the first two-way communication state, only the first port 54 and the second port 56 are opened and communicated, and the third port 58 is closed.
(4) FIG. 5 shows the second two-way communication state of each port. In the second two-way communication state, only the first port 54 and the third port 58 are opened and communicated, and the second port 56 is closed.
(5) FIG. 6 shows a third two-way communication state of each port. In the second two-way communication state, only the second port 56 and the third port 58 are opened and communicated, and the first port 54 is closed.

  As shown in FIG. 7, the first piping section 64 communicates with the water storage chamber 14 via the first communication pipe 74. One end of the first communication pipe 74 is connected to the first flange portion 64 </ b> F, and the other end is connected to the side wall 17 of the water tank 18. Thereby, the first inflow line P <b> 1 is formed by the first communication pipe 74 and the first pipe portion 64. Further, the second piping section 66 communicates with the water storage chamber 16 via the second communication pipe 76. One end of the second communication pipe 76 is connected to the second flange portion 66 </ b> F, and the other end is connected to the side wall 17 of the water tank 18. As a result, the second inflow line P <b> 2 is formed by the second communication pipe 76 and the second pipe portion 66. And the 3rd piping part 68 is connected to the intake pipe 78 via the 3rd flange part 68F. Thereby, the water intake line P3 is formed by the water intake pipe 78 and the third piping part 68.

  As shown in FIG. 8, the lower side of the water tank 18 is supported by a gantry 20 fixed to the building frame. The gantry 20 is formed with a gantry extension 22 extending from the gantry 20 to the switching valve 50 side. A fixing bracket 24 is fixed to the upper end of the gantry extension 22 so as to be positioned below the switching valve 50 in plan view. The fixing bracket 24 is connected to the first communication pipe 74 from above. The U band 26 to be spanned is fixed, and the U band 28 to be spanned from above is fixed to the second communication pipe 76. As a result, the first communication pipe 74 and the second communication pipe 76 are fixed to the fixture 24 by the U band 26 and the U band 28. That is, since the switching valve 50 fixed to the first communication pipe 74 and the second communication pipe 76 is also fixed to the fixing bracket 24, the switching valve 50 includes the fixing bracket 24, the gantry extension 22, and the gantry 20. It fixes to the water tank 18 via. For this reason, the water tank 18, the switching valve 50, the 1st communication pipe 74, and the 2nd communication pipe 76 move integrally at the time of an earthquake. FIG. 7 shows the water tank piping system when the switching valve 50 is in the all-communication state.

(Operation and Effect) The operation and effect of this embodiment will be described below.
By rotating the handle 63, the valve body 60 is rotated via the rotation shaft portion 62. When the valve body 60 is rotated to the position shown in FIG. 2, the switching valve 50 is fully connected, and the first port 54, the second port 56, and the third port 58 are all opened and communicated. To do. In this all-communication state, the first inflow line P1, the second inflow line P2, and the water intake line P3 communicate with each other, so that the normal operation (intake) is performed using the water storage chamber 14 and the water storage chamber 16. Will be able to.

  Next, when the valve body 60 is rotated to the position shown in FIG. 3 (A) or 3 (B), the switching valve 50 is fully closed, and the first port 54, the second port 56, And since all the 3rd ports 58 are closed, the outflow of the fluid from the intake line P3 is prevented, and the movement of the fluid between the water storage chamber 14 and the water storage chamber 16 is prevented. Further, when the valve body 60 is rotated to the position shown in FIG. 4, the switching valve 50 is in the first two-way communication state, and only the first port 54 and the second port 56 are opened and communicated. The water storage chamber 14 and the water storage chamber 16 communicate with each other via the first inflow line P1 and the second inflow line P2, and movement of fluid between the water storage chamber 14 and the water storage chamber 16 is permitted. At this time, since the third port 58 is closed, the outflow of fluid from the water intake line P3 is prevented. Here, in the event of an earthquake, the outflow of fluid from the water intake line P3 can be prevented by setting the switching valve 50 to a fully closed state or a first two-way communication state.

  Next, when the valve body 60 is rotated to the position shown in FIG. 5, the switching valve 50 is in the second two-way communication state, and the first port 54 and the third port 58 are opened and communicated. The water storage chamber 14 and the water intake line P3 communicate with each other through the first inflow line P1. At this time, since the second port 56 is closed, it is possible to perform normal operation (water intake) using the water storage chamber 14 while performing maintenance such as cleaning in the water storage chamber 16. Then, when the valve body 60 is rotated to the position shown in FIG. 6, the switching valve 50 enters the third two-way communication state, and the second port 56 and the third port 58 open and communicate with each other. The water storage chamber 16 and the water intake line P3 communicate with each other through the two inflow lines P2. At this time, since the first port 54 is closed, it is possible to perform normal operation (water intake) using the water storage chamber 16 while performing maintenance such as cleaning in the water storage chamber 14.

  As described above, the switching valve 50 used in the aquarium piping system 10 of the present embodiment has the first port 54, the second port 56, and the third port 58 according to the rotational position of the valve body 60. The communication state can be switched to five states. For this reason, the aquarium piping system 10 can reduce the number of parts (mainly the number of valves) compared to the conventional aquarium piping system (piping system using a two-way valve type emergency shut-off valve) 100, and can reduce the cost. Can be improved. Specifically, the functions of the two emergency shut-off valves 90 and 92 and the on-off valve 98 of the water tank piping system 100 can be substituted by the switching valve 50 of the present embodiment, so that the number of parts can be reduced and the cost can be reduced. Can be improved.

Moreover, in the water tank piping system 10 of this embodiment, since it is only necessary to provide an opening (water intake) for the communication pipe that forms an inflow line to the switching valve for each water storage chamber, the number of openings provided in the water storage chamber is small. Thus, the reliability with respect to water leakage from around the opening is improved.
Furthermore, in the water tank piping system 10 of this embodiment, since the switching valve 50 is fixed to the water tank 18, the switching valve 50, the 1st communication pipe 74, and the 2nd communication pipe 76 are integrated at the time of an earthquake etc. Move on. Thereby, it is possible to prevent water leakage or the like from occurring in a pipe portion between the switching valve 50 and the water tank 18 (including a connection portion of the first communication pipe 74 and the second communication pipe 76).

(Second Embodiment)
(Configuration) Next, a second embodiment of the aquarium piping system of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the structure similar to 1st Embodiment, and description is abbreviate | omitted. As shown in FIG. 9, the aquarium piping system 30 according to the present embodiment includes a water tank 38 in which two water storage chambers 34 and 36 are formed by an intermediate partition wall 32, and a switching valve disposed in the water storage chamber 36. 50. In the present embodiment, the switching valve 50 is arranged in the water storage chamber 36. However, the present invention is not limited to this configuration, and the switching valve 50 may be arranged in the water storage chamber 34. Be good.

  As shown in FIG. 10, the switching valve 50 of the water storage chamber 36 is arranged so that the handle 63 is positioned downward. The rotation shaft portion 62 of the switching valve 50 extends from the water storage chamber 84 to the outside of the water tank 38 through the lower wall 39 of the water tank 38, and the handle 63 is disposed outside the water tank 38. Thereby, even if the switching valve 50 is disposed in the water storage chamber 36, the valve body 60 can be rotated.

  As shown in FIGS. 9 and 10, the switching valve 50 is configured such that the first flange portion 64 </ b> F is bolted to the intermediate partition wall 32 in a state where a part of the valve housing 52 is placed on the floor surface of the water storage chamber 36. The third flange portion 68F is fixed to the side wall 37 of the water tank 38 with bolts and fixed in the water storage chamber 36. The first piping portion 64 of the switching valve 50 communicates with the water storage chamber 34 through an opening 32A provided in the inner partition wall 32, and the third piping portion 68 is an opening 37A provided in the side wall 37. Is connected to a water intake pipe 40 fixed to the side wall 37 from the outside of the water tank 38. The second piping section 66 is disposed in the water storage chamber 36 and communicates with the water storage chamber 36.

(Operation and Effect) The operation and effect of this embodiment will be described below. In addition, since the operation and effect similar to those of the first embodiment can be obtained in this embodiment, the description of the portion is omitted.
In the aquarium piping system 30 of this embodiment, since the switching valve 50 is arrange | positioned in the water storage chamber 36, the installation space of a water tank becomes compact rather than arrange | positioning the switching valve 50 on the outer side of a water tank. Moreover, in this embodiment, the number of parts, such as a communicating pipe and a stand extension part, can be reduced rather than the water tank piping system by which the switching valve 50 is arrange | positioned on the outer side of a water tank. As a result, the cost can be further improved.

(Other embodiments)
In the above-described embodiment, the valve body 60 has a hemispherical shape. However, the present invention is not limited to this configuration, and may have a semi-cylindrical shape or a shape other than the semi-cylindrical shape. Be good.

  In the switching valve 50 of the above-described embodiment, the outer peripheral portion 60A of the valve body 60 is configured to block the first port 54, the second port 56, and the third port 58. It is not necessary to be limited to the above, and a convex portion that can contact the outer peripheral portion 60A of the valve body 60 is provided on the inner wall portion of the valve housing 52, and each port is blocked by the convex portion and the outer peripheral portion 60A contacting each other. It is good also as a structure.

  Further, in the above-described embodiment, the handle 63 is provided at the one end portion 62A of the rotation shaft portion 62, and the valve body 60 can be rotated by rotating the handle 63. It is not necessary to be limited to the configuration, and an actuator controlled by a control unit (not shown) may be connected to one end portion 62A of the rotation shaft portion 62. Still further, when movement due to impact or the like occurs in the water tank 18, the control unit operates the actuator to rotate the valve body 60, so that the switching valve 50 is fully closed or in the first two-way communication state. The water tank piping system may have a function as a so-called emergency shutoff valve.

  The embodiments of the present invention have been described above with reference to the embodiments. However, these embodiments are merely examples, and various modifications can be made without departing from the scope of the invention. Further, it goes without saying that the scope of rights of the present invention is not limited to these embodiments, and for example, the switching valve of the present invention may be used in a piping system other than a water tank piping system. Furthermore, as an example, three or more water storage chambers may be provided in the water tank.

It is a schematic plan view which shows the whole structure of the water tank piping system which concerns on 1st Embodiment. It is a plane sectional view showing the all way communication state of the change-over valve concerning a 1st embodiment. (A) It is a plane sectional view showing one all closed state of the change-over valve concerning a 1st embodiment. (B) It is a plane sectional view showing other all closed states of the change-over valve concerning a 1st embodiment. It is a top sectional view showing the 1st two-way communication state of the change-over valve concerning a 1st embodiment. It is a plane sectional view showing the 2nd two-way communication state of the change-over valve concerning a 1st embodiment. It is a top sectional view showing the 3rd two-way communication state of the change-over valve concerning a 1st embodiment. It is a plane sectional view of the important section of the aquarium piping system concerning a 1st embodiment. It is side surface sectional drawing of the principal part of the water tank piping system which concerns on 1st Embodiment. It is a plane sectional view of the important section of the water tank piping system concerning a 2nd embodiment. It is side surface sectional drawing of the principal part of the water tank piping system which concerns on 2nd Embodiment. It is a typical top view which shows the whole structure of the water tank system of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Water tank piping system 14 Water storage chamber 16 Water storage chamber 18 Water tank 30 Water tank piping system 34 Water storage chamber 36 Water storage chamber 50 Switching valve 52 Valve housing 54 1st port 56 2nd port 58 3rd port 60 Valve body 60A Outer part P1 1st inflow line P2 2nd inflow line P3 Intake line

Claims (6)

A valve housing having a first port, a second port, and a third port;
An all-communication state in which the first port, the second port, and the third port are all opened and communicated with each other according to the pivot position; An all-closed state in which one port, the second port, and the third port are all closed, and a first two-way communication state in which only the first port and the second port are open and communicate with each other. , A second two-way communication state in which only the first port and the third port are opened and communicated, and a third two-way communication in which only the second port and the third port are opened and communicated A valve body for switching between the state and
A switching valve comprising:   2. The switching valve according to claim 1, wherein an outer peripheral portion of the valve body closes the first port, the second port, and the third port.   The switching valve according to claim 1 or 2, wherein the valve body is hemispherical or semi-cylindrical. A water tank having a plurality of water storage chambers;
The switching valve according to any one of claims 1 to 3, which is disposed outside the water tank,
A first inflow line communicating the one water storage chamber and the first port of the switching valve;
A second inflow line communicating the other water storage chamber and the second port of the switching valve;
A water intake line connected to the third port of the switching valve;
A water tank piping system comprising: A water tank having a plurality of water storage chambers;
The switching valve according to any one of claims 1 to 3, which is disposed in one of the water storage chambers,
A first port of the switching valve communicates with the one water storage chamber;
A second port of the switching valve communicates with the other water storage chamber;
A water tank piping system, wherein a third port of the switching valve is connected to a water intake line provided outside the water tank.   The water tank piping system according to claim 4 or 5, wherein an actuator for rotating the valve body of the switching valve is provided.

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