Water channel system with zero cold water function and anti-water-leakage tee valve

Abstract

The utility model provides a kind of three-way valve and zero cold water function waterway system of water channeling prevention, including valve body, valve and elastic member, valve body has valve cavity and the first flow-through port, second flow-through port and third flow-through port being communicated with each other by valve cavity, valve is set to the inside of valve cavity, one end of valve is hinged in valve body, the surface of valve is used to abut and close the inside of first flow-through port, the other surface of valve is used to abut and close the inside of second flow-through port, two ends of elastic member are connected in valve body and valve respectively, elastic member exerts an acting force to make valve close first flow-through port.Valve is installed in the inside of valve body, valve can rotate, valve can close first flow-through port under the action of elastic member, make first flow-through port not communicate with valve cavity, prevent water from flowing backwards, valve can also close second flow-through port while opening first flow-through port, make first flow-through port communicate with third flow-through port, prevent water in valve cavity from flowing out from second flow-through port, prevent water channeling.

Description

Technical Field

[0001] This utility model relates to a three-way valve for preventing water leakage and a water circuit system with zero cold water function. Background Technology

[0002] The working principle of a water heater with zero cold water is as follows: when the user is not using hot water, the water heater detects that the water temperature in the pipes is lower than the set temperature and starts the built-in circulating water pump. After the pump starts running, the water in the pipes will flow into the water heater for circulation and heating until the water in the pipes is heated to the specified temperature. Then the circulating water pump stops running and the water heater stops working.

[0003] like Figure 1 As shown, for households without a separate return water pipe, to achieve the zero-cold-water function, the faucet 101 at the furthest end of the water line is usually modified. Below this faucet 101, the hot water pipe 102 and the cold water pipe 103 are connected via a connecting pipe. To prevent cold water from flowing back into the hot water pipe 102 when hot water is used, a one-way valve 104 is installed on the connecting pipe. When the zero-cold-water function is achieved, the circulating water pump is turned on. The water pressure from the hot water pipe 102 to the last faucet 101 is greater than the water pressure from the cold water pipe 103 to the last faucet 101. The one-way valve 104 opens, and the cold water in the hot water pipe 102 flows through the one-way valve 104 and the cold water pipe 103 into the water heater 105 for circulating heating. However, in many households, even without the circulating water pump turned on, the water resistance from the hot water pipe 102 to the last tap 101 is less than that from the cold water pipe 103 to the last tap 101. This means the water pressure in the hot water pipe 102 is greater than that in the cold water pipe 103. In this situation, at the last tap 101, when the user turns on the cold water, some water flows from the cold water pipe 103, and some water flows from the hot water pipe 102 through the check valve 104. In some cases, all the water flows from the hot water pipe 102. This causes the water heater 105 to start, resulting in hot water being dispensed when the user wants cold water, causing great inconvenience to the user. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a three-way valve with anti-water leakage and a water circuit system with zero cold water function.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] A three-way valve for preventing water leakage includes a valve body, a valve, and an elastic element. The valve body has a valve cavity and a first flow port, a second flow port, and a third flow port that communicate with each other through the valve cavity. The valve is disposed inside the valve cavity, with one end of the valve hinged to the valve body. One surface of the valve is used to abut against and close the inner side of the first flow port, and the other surface of the valve is used to abut against and close the inner side of the second flow port. The two ends of the elastic element are respectively connected to the valve body and the valve, and the elastic element applies a force to close the first flow port of the valve.

[0007] In this design, the three-way valve is equipped with a first flow port, a second flow port, and a third flow port. The valve is installed inside the valve body and is rotatable. Under the action of the elastic element, the valve can close the first flow port, preventing the first flow port from communicating with the valve cavity and preventing water backflow. The valve can also close the second flow port while opening the first flow port, connecting the first flow port with the third flow port, and preventing water in the valve cavity from flowing out of the second flow port, thus preventing water leakage. This achieves the functions of a three-way valve and a one-way valve, reducing the number of components.

[0008] When the water pressure flowing into the first flow port is greater than the water pressure in the valve cavity, the valve overcomes the elastic force of the elastic element under the action of water pressure, and the valve rotates to open the first flow port, which is connected to the valve cavity. At this time, water can flow into the valve cavity from the first flow port and then flow out from the third flow port. When the valve rotates to the position of closing the second flow port, the water in the valve cavity cannot flow out from the second flow port.

[0009] If the first port of the anti-cross-flow three-way valve is connected to the hot water end of the water heater, and the third port is connected to the cold water end, placing the anti-cross-flow three-way valve in the circulation loop of the zero-cold-water water heater, and the second port of the three-way valve is connected to the cold water end of the faucet, when the circulation is open, the valve overcomes the elastic force of the elastic element under the action of water flow, causing the valve to rotate and open the first port. At this time, the circulation loop is open. When the valve rotates, the flow area of ​​the second port decreases, and the resistance increases, but the resistance of the circulation loop decreases, and the circulation is normally open. When the circulation is closed, the valve rotates under the action of the elastic element, closing the first port, thereby closing the circulation loop again and returning it to its original position.

[0010] Because some users have a zero-cold-water circulation system, the water resistance in the hot water pipe is less than that in the cold water pipe (i.e., the water pressure at the first flow port is greater than that at the third flow port). When the circulation is closed and the user turns on the tap to use cold or warm water, the water in the hot water pipe will briefly push the valve to turn, opening the first flow port and flowing into the valve chamber, and then flowing out through the second flow port. However, during the valve rotation, the flow area of ​​the second flow port decreases, and the resistance at the cold water outlet increases. When the valve is turned to a certain degree, the water resistance at the first flow port is greater than that at the third flow port, causing cold water to flow in from the third flow port and then out from the second flow port. This prevents water from continuing to flow from the first flow port to the cold water end of the tap, thus preventing water from continuously flowing from the hot water pipe to the cold water outlet and avoiding water leakage.

[0011] Preferably, the number of elastic elements is two, and the two elastic elements are symmetrically arranged with respect to the valve.

[0012] In this solution, the above-mentioned structural design can improve the pre-tightening force of the valve when it is closed, and also make the valve subjected to uniform force, which facilitates the opening or closing of the valve.

[0013] Preferably, the valve is circular and adapted to the first flow port and the second flow port, and the valve has symmetrically arranged outwardly protruding connecting ears on both sides, which are used to connect the elastic element.

[0014] In this design, the circular valve saves installation space and allows for easy rotation within a smaller area. The circular valve also easily adapts to circular first and second flow ports, improving the sealing effect.

[0015] Preferably, the three-way valve further includes a rotating shaft, one end of which is hinged to the valve body via the rotating shaft, and the first flow port and the second flow port are located on both sides of the rotating shaft.

[0016] In this design, the valve is mounted on the valve body via a pivot, allowing the valve to rotate around the pivot. When the valve rotates to one side until one surface abuts against the inside of the first flow port, the valve closes the first flow port. When the valve rotates to the other side until another surface abuts against the inside of the second flow port, the valve closes the second flow port.

[0017] Preferably, the valve body has a first flange surrounding the first flow port, the first flange protruding toward the valve cavity, and the first flange is used to abut and seal against one side of the valve.

[0018] In this design, the first flange surrounding the first flow port prevents interference with the inner wall of the valve body during opening or closing, facilitating the sealing of the first flow port and improving its sealing effect.

[0019] Preferably, the end face of the first flange is a vertical plane, which is used to abut against the valve and close the first flow port.

[0020] In this design, when the valve closes the first flow port, the valve is in a vertical position. The valve remains perpendicular to the horizontally extending first flow port, and the water flowing in from the first flow port pressurizes the valve, making it easier to open and improving the valve's sensitivity.

[0021] Preferably, the valve body further has a second flange surrounding the second flow port, the second flange protruding toward the valve cavity, and the second flange being used to abut and seal against the other side of the valve.

[0022] In this design, the second flange surrounding the second flow port prevents interference with the inner wall of the valve body during opening or closing, facilitating the sealing of the second flow port and improving its sealing effect.

[0023] Preferably, the end face of the second flange is an inclined surface, which is inclined downward from the proximal end near the valve to the distal end away from the valve, and the inclined surface is used to abut against the valve and close the second flow port.

[0024] In this design, the end face of the second flange is set as an inclined surface, which makes it easier to close the second flow port by rotating the valve at a small angle.

[0025] Preferably, a clearance space is formed between the first flange and the second flange, the pivot of the three-way valve is installed in the clearance space, and the valve is hinged to the valve body through the pivot.

[0026] In this design, the end of the valve near the shaft will swing within the space during rotation. By providing clearance space, interference between the valve end and the inner wall of the valve body can be avoided during the rotation process.

[0027] A water system with zero cold water function, the water system includes a faucet, a hot water pipe, a cold water pipe, a water heater, and a three-way valve for preventing water leakage as described above. One end of the cold water pipe is connected to the inlet of the water heater, and the other end of the cold water pipe is connected to the cold water end of the faucet through the third and second flow ports of the three-way valve. One end of the hot water pipe is connected to the outlet of the water heater, and the other end of the hot water pipe is connected to the hot water end of the faucet. The first flow port of the three-way valve is connected to the hot water pipe through a circulation pipe.

[0028] In this scheme, when the circulation is open, the valve overcomes the elastic force of the elastic element under the action of water flow, causing the valve to rotate and open the first flow port. At this time, the circulation loop is open. When the valve rotates, the flow area of ​​the second flow port decreases and the resistance increases, but the resistance of the circulation loop decreases, and the circulation is opened normally. When the circulation is closed, the valve rotates under the action of the elastic element, closing the first flow port, thereby closing the circulation loop again and restoring it to its original position.

[0029] Because some users have a circulating system with zero cold water, the water resistance of the hot water pipe is less than that of the cold water pipe (i.e., the water pressure at the first flow port is greater than that at the third flow port). When the circulation is closed and the user turns on the tap to use cold or warm water, the water in the hot water pipe will briefly push the valve to turn, opening the first flow port and flowing into the valve chamber, and then flowing out through the second flow port. However, during the valve rotation, the flow area of ​​the second flow port decreases, and the resistance of the cold water outlet increases. When the valve is turned to a certain degree, the water resistance of the first flow port is greater than that of the third flow port, causing cold water to flow in from the third flow port and then out from the second flow port. This prevents water from continuing to flow from the first flow port to the cold water end of the tap, thus preventing water from continuously flowing from the hot water pipe to the cold water outlet and avoiding water leakage.

[0030] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this utility model.

[0031] The positive and progressive effects of this utility model are as follows: The three-way valve is provided with a first flow port, a second flow port and a third flow port. The valve is installed inside the valve body and can rotate. Under the action of the elastic element, the valve can close the first flow port, so that the first flow port is not connected to the valve cavity, thus preventing water backflow. The valve can also close the second flow port while opening the first flow port, so that the first flow port is connected to the third flow port, and at the same time prevent water in the valve cavity from flowing out from the second flow port, thus preventing water leakage. In this way, the functions of a three-way valve and a one-way valve are realized, reducing the number of components.

[0032] When the water pressure flowing into the first flow port is greater than the water pressure in the valve cavity, the valve overcomes the elastic force of the elastic element under the action of water pressure, and the valve rotates to open the first flow port, which is connected to the valve cavity. At this time, water can flow into the valve cavity from the first flow port and then flow out from the third flow port. When the valve rotates to the position of closing the second flow port, the water in the valve cavity cannot flow out from the second flow port. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of a water heater with zero cold water function in the prior art.

[0034] Figure 2 This is a three-dimensional structural diagram of a three-way valve for preventing water leakage according to a preferred embodiment of the present invention.

[0035] Figure 3 This is a schematic diagram of the internal structure of a three-way valve for preventing water leakage according to a preferred embodiment of the present invention (the valve is in the state of closing the first flow port).

[0036] Figure 4 This is a schematic diagram of the internal structure of a three-way valve for preventing water leakage according to a preferred embodiment of the present invention (the valve is in the state of closing the second flow port).

[0037] Figure 5 This is a schematic diagram of the valve structure according to a preferred embodiment of the present invention.

[0038] Figure 6 This is a schematic diagram of the structure of a water system with zero cold water function according to a preferred embodiment of the present invention. Detailed Implementation

[0039] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0040] like Figures 2-6 As shown, this embodiment discloses a three-way valve for preventing water leakage. The three-way valve 50 includes a valve body 1, a valve 2, and an elastic element 3. The valve body 1 has a valve cavity 11 and a first flow port 12, a second flow port 13, and a third flow port 14 that are interconnected through the valve cavity 11. The valve 2 is disposed inside the valve cavity 11. One end of the valve 2 is hinged to the valve body 1. One surface of the valve 2 is used to abut against and close the inner side of the first flow port 12, and the other surface of the valve 2 is used to abut against and close the inner side of the second flow port 13. The two ends of the elastic element 3 are respectively connected to the valve body 1 and the valve 2. The elastic element 3 applies a force to close the first flow port 12 of the valve 2. The three-way valve 50 is provided with a first flow port 12, a second flow port 13 and a third flow port 14. The valve 2 is installed inside the valve body 1 and can rotate. Under the action of the elastic element 3, the valve 2 can close the first flow port 12, so that the first flow port 12 is not connected to the valve cavity 11, preventing water backflow. The valve 2 can also close the second flow port 13 while opening the first flow port 12, so that the first flow port 12 is connected to the third flow port 14, and at the same time prevent water in the valve cavity 11 from flowing out of the second flow port 13, preventing water leakage. Thus, it realizes the functions of a three-way valve and a one-way valve, which can reduce the number of components.

[0041] like Figure 2 and Figure 3As shown, when the water pressure flowing into the first flow port 12 is greater than the water pressure in the valve cavity 11, the valve 2 overcomes the elastic force of the elastic element 3 under the action of water pressure, and the valve 2 rotates to open the first flow port 12. The first flow port 12 is connected to the valve cavity 11. At this time, water can flow into the valve cavity 11 from the first flow port 12 and then flow out from the third flow port 14. When the valve 2 rotates to the position of closing the second flow port 13, the water in the valve cavity 11 cannot flow out from the second flow port 13.

[0042] like Figure 6 As shown, if the first flow port 12 of the anti-cross-flow three-way valve 50 is connected to the hot water end of the water heater 40, and the third flow port 14 is connected to the cold water end of the water heater 40, the anti-cross-flow three-way valve 50 is located on the circulation loop of the zero-cold-water water heater 40. The second flow port 13 of the three-way valve 50 is also connected to the cold water end of the faucet 10. When the circulation is open, the valve 2 overcomes the elastic force of the elastic element 3 under the action of the water flow, causing the valve 2 to rotate and open the first flow port 12. At this time, the circulation loop is open. When the valve 2 rotates, the flow area of ​​the second flow port 13 decreases, and the resistance increases, but the resistance of the circulation loop decreases, and the circulation is normally open. When the circulation is closed, the valve 2 rotates under the action of the elastic element 3, closing the first flow port 12, thereby closing the circulation loop again and restoring it to its original position.

[0043] like Figure 6 As shown, because some users have a zero-cold-water circulation system, the water resistance in the hot water pipe 20 is less than the water resistance in the cold water pipe 30 (i.e., the water pressure at the first flow port 12 is greater than the water pressure at the third flow port 14). When the circulation is closed and the user turns on the faucet 10 to use cold or warm water, the water in the hot water pipe 20 will briefly push the valve 2 to turn, opening the first flow port 12 and flowing into the valve chamber 11, and then flowing out through the second flow port 13. However, during the rotation of the valve 2, the flow area of ​​the second flow port 13 decreases, and the resistance at the cold water outlet increases. When the valve 2 turns to a certain opening, the water resistance at the first flow port 12 is greater than the water resistance at the third flow port 14, causing cold water to flow in from the third flow port 14 and then out from the second flow port 13. This prevents water from continuing to flow from the first flow port 12 to the cold water end of the faucet 10, thus preventing water from continuously flowing from the hot water pipe 20 to the cold water outlet and avoiding cross-contamination. The cold water pipe 30 is connected to the water inlet, and the water flow direction is as follows: Figure 6 As shown by the arrow in the image.

[0044] like Figure 4 and Figure 5 As shown, there are two elastic elements 3. The two elastic elements 3 are symmetrically arranged relative to the valve 2, which can increase the pre-tightening force of the valve 2 when closing, and also make the valve 2 subjected to force evenly, making it easier for the valve 2 to open or close.

[0045] The valve 2 is circular and adaptable to the first flow port 12 and the second flow port 13. Symmetrically arranged on both sides of the valve 2 are outwardly protruding connecting ears 21, which are used to connect the elastic element 3. The circular shape of the valve 2 saves installation space and facilitates rotation within a smaller space. The circular shape also facilitates adaptation to the circular first flow port 12 and the second flow port 13, improving the sealing effect.

[0046] like Figure 3 and Figure 4 As shown, the three-way valve 50 also includes a pivot 4. One end of the valve 2 is hinged to the valve body 1 via the pivot 4. The first flow port 12 and the second flow port 13 are located on both sides of the pivot 4, reducing the rotation space of the valve 2 and facilitating the valve 2 to close the first flow port 12 or the second flow port 13 by rotation. The valve 2 is mounted on the valve body 1 via the pivot 4 and can rotate around the pivot 4. When the valve 2 rotates to one side until one surface abuts against the inside of the first flow port 12, the valve 2 closes the first flow port 12. When the valve 2 rotates to the other side until the other surface abuts against the inside of the second flow port 13, the valve 2 closes the second flow port 13.

[0047] like Figure 3 As shown, the valve body 1 has a first flange 15 surrounding the first flow port 12. The first flange 15 protrudes towards the valve cavity 11 and is used to abut and seal against one side of the valve 2. The first flange 15 surrounding the first flow port 12 prevents the valve 2 from interfering with the inner wall of the valve body 1 during opening or closing, facilitates the sealing of the first flow port 12 by the valve 2, and also improves the sealing effect of the valve 2 in sealing the first flow port 12.

[0048] The end face of the first flange 15 is a vertical plane 151, which is used to abut against the valve 2 and close the first flow port 12. When the valve 2 closes the first flow port 12, the valve 2 is in a vertical state, and the valve 2 remains perpendicular to the horizontally extending first flow port 12. The water flowing in from the first flow port 12 pressurizes the valve 2, which facilitates opening the valve 2 and improves the sensitivity of the valve 2.

[0049] The valve body 1 also has a second flange 16 surrounding the second flow port 13. The second flange 16 protrudes towards the valve cavity 11 and is used to abut and seal against the other side of the valve 2. The second flange 16 surrounding the second flow port 13 prevents the valve 2 from interfering with the inner wall of the valve body 1 during opening or closing, facilitates the sealing of the second flow port 13 by the valve 2, and improves the sealing effect of the valve 2 in sealing the second flow port 13.

[0050] The end face of the second flange 16 is an inclined surface 161. The inclined surface 161 is inclined downward from the proximal end near the valve 2 to the distal end away from the valve 2. The inclined surface 161 is used to abut against the valve 2 and close the second flow port 13. Setting the end face of the second flange 16 as an inclined surface 161 makes it easier for the valve 2 to close the second flow port 13 by rotating it by a small angle.

[0051] A clearance space 17 is formed between the first flange 15 and the second flange 16. The shaft 4 of the three-way valve 50 is installed in the clearance space 17, and the valve 2 is hinged to the valve body 1 via the shaft 4. During rotation, the end of the valve 2 near the shaft 4 will swing within the space. The clearance space 17 is provided to prevent interference between the end of the valve 2 and the inner wall of the valve body 1 during rotation.

[0052] like Figure 6 As shown, a water system with zero cold water function includes a faucet 10, a hot water pipe 20, a cold water pipe 30, a water heater 40, and a three-way valve 50 for preventing cross-flow as described above. One end of the cold water pipe 30 is connected to the inlet of the water heater 40, and the other end of the cold water pipe 30 is connected to the cold water end of the faucet 10 through the third flow port 14 and the second flow port 13 of the three-way valve 50. One end of the hot water pipe 20 is connected to the outlet of the water heater 40, and the other end of the hot water pipe 20 is connected to the hot water end of the faucet 10. The first flow port 12 of the three-way valve 50 is connected to the hot water pipe 20 through a circulation pipe 60. The cold water pipe 30 is connected to the inlet, and the water flow direction is as described above. Figure 6 As shown by the arrow in the image.

[0053] When the circulation is open, valve 2 overcomes the elastic force of elastic element 3 under the action of water flow, causing valve 2 to rotate and open the first flow port 12. At this time, the circulation loop is open. When valve 2 rotates, the flow area of ​​the second flow port 13 decreases and the resistance increases, but the resistance of the circulation loop decreases. The water in the hot water pipe 20 flows back to the water heater 40 for heating through the three-way valve 50 and the cold water pipe 30, and the circulation is normally open. When the circulation is closed, valve 2 rotates under the action of elastic element 3, closing the first flow port 12, thereby closing the circulation loop again and restoring it to its original position.

[0054] Because some users have a circulating system with zero cold water, the water resistance in the hot water pipe 20 is less than the water resistance in the cold water pipe 30 (i.e., the water pressure at the first flow port 12 is greater than the water pressure at the third flow port 14). When the circulation is closed and the user opens the farthest faucet 10 to use cold or warm water, the water in the hot water pipe 20 will briefly push the valve 2 to turn, opening the first flow port 12 and flowing into the valve chamber 11, and then flowing out through the second flow port 13. However, during the rotation of the valve 2, the flow area of ​​the second flow port 13 decreases, and the resistance of the cold water outlet increases. When the valve 2 turns to a certain opening, the water resistance of the first flow port 12 is greater than the water resistance of the third flow port 14, causing cold water to flow in from the third flow port 14 and then flow out from the second flow port 13. This prevents water from continuing to flow from the first flow port 12 to the cold water end of the faucet 10, thus preventing water from continuously flowing from the hot water pipe 20 to the cold water outlet and avoiding cross-contamination.

[0055] In the description herein, it should be understood that the terms "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0056] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A three-way valve for preventing water leakage, characterized in that, The three-way valve includes a valve body, a valve, and an elastic element. The valve body has a valve cavity and a first flow port, a second flow port, and a third flow port that communicate with each other through the valve cavity. The valve is disposed inside the valve cavity. One end of the valve is hinged to the valve body. One surface of the valve is used to abut against and close the inner side of the first flow port, and the other surface of the valve is used to abut against and close the inner side of the second flow port. The two ends of the elastic element are respectively connected to the valve body and the valve. The elastic element applies a force to close the first flow port of the valve.

2. The three-way valve for preventing water leakage as described in claim 1, characterized in that, The number of elastic elements is two, and the two elastic elements are symmetrically arranged with respect to the valve.

3. The three-way valve for preventing water leakage as described in claim 2, characterized in that, The valve is circular and adapted to the first flow port and the second flow port. Symmetrically arranged on both sides of the valve are outwardly protruding connecting ears, which are used to connect the elastic element.

4. The three-way valve for preventing water leakage as described in claim 1, characterized in that, The three-way valve also includes a rotating shaft, one end of which is hinged to the valve body via the rotating shaft, and the first flow port and the second flow port are located on both sides of the rotating shaft.

5. The three-way valve for preventing water leakage as described in claim 4, characterized in that, The valve body has a first flange surrounding the first flow port, the first flange protruding toward the valve cavity, and the first flange is used to abut and seal against one side of the valve.

6. The three-way valve for preventing water leakage as described in claim 5, characterized in that, The end face of the first flange is a vertical plane, which is used to abut against the valve and close the first flow port.

7. The three-way valve for preventing water leakage as described in claim 5, characterized in that, The valve body also has a second flange surrounding the second flow port, the second flange protruding toward the valve cavity, and the second flange is used to abut and seal against the other side of the valve.

8. The three-way valve for preventing water leakage as described in claim 7, characterized in that, The end face of the second flange is an inclined surface, which is inclined downward from the proximal end near the valve to the distal end away from the valve. The inclined surface is used to abut against the valve and close the second flow port.

9. The three-way valve for preventing water leakage as described in claim 8, characterized in that, A clearance space is formed between the first flange and the second flange, the pivot of the three-way valve is installed in the clearance space, and the valve is hinged to the valve body through the pivot.

10. A water system with zero-cold-water function, characterized in that, The water system includes a faucet, a hot water pipe, a cold water pipe, a water heater, and a three-way valve for preventing cross-flow as described in any one of claims 1-9. One end of the cold water pipe is connected to the inlet of the water heater, and the other end of the cold water pipe is connected to the cold water end of the faucet through the third and second flow ports of the three-way valve. One end of the hot water pipe is connected to the outlet of the water heater, and the other end of the hot water pipe is connected to the hot water end of the faucet. The first flow port of the three-way valve is connected to the hot water pipe through a circulation pipe.

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