Water pressure driving three-way valve and coffee machine extraction liquid path

Abstract

The utility model discloses a water pressure driven three-way valve and a coffee machine extraction liquid path, belongs to the coffee beverage extraction technology, and solves the problems that the existing coffee machine releases extraction water pressure through an electric control valve, so that the program is complicated, faults easily occur, the layout of water paths and circuits is disordered, and the electric control valve is high in cost. The water inlet and the pressure relief opening of the three-way valve can be alternatively communicated with the water outlet along with the movement of the valve core, the water inlet is connected to the water pump, the water outlet is connected to the extraction device, the pressure relief opening is connected to the waste water box, and the valve core blocks the water inlet through the elastic force of the spring while the pressure relief opening is communicated with the water outlet. The valve element overcomes the elastic force of the spring through water pressure provided for the water inlet to block the pressure relief opening, and the water inlet is communicated with the water outlet at the moment. According to the three-way valve, the communication state of the three-way valve is switched by conveying or stopping conveying of extraction water, water pressure driving is achieved, the control program of a controller is simplified, the circuit failure rate is reduced, circuit arrangement is simplified, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technology of coffee beverage extraction, and in particular relates to a water pressure driven three-way valve and a coffee machine extraction liquid circuit. Background Art

[0002] Coffee machines that produce coffee beverages through extraction process deliver hot water at a desired pressure to an extraction unit. The hot water then flows through the coffee grounds in the extraction unit, completing the extraction process to produce the coffee beverage. After extraction, the coffee grounds become grounds, which require the extraction unit to be opened to remove. Because the hot water is under pressure during extraction, releasing the water pressure is a prerequisite for opening the extraction unit, whether manually or automatically.

[0003] In the prior art, releasing the extraction water pressure is achieved through an electrically controlled valve. This requires additional control circuitry to control the valve, making the coffee machine controller's control program complex and prone to failure. The electrically controlled valve also needs to be connected to both the water circuit and the control circuit, resulting in a cluttered layout of the water and circuitry. The electrically controlled valve is also costly. Utility Model Content

[0004] The technical problem to be solved and the technical task proposed by the present invention are to overcome the defects of the existing coffee machine caused by the release of extraction water pressure through the electric control valve, such as the complicated procedure and easy failure, the messy layout of the water circuit and circuit, and the high cost of the electric control valve, and to provide a water pressure-driven three-way valve and a coffee machine extraction liquid circuit.

[0005] To achieve the above-mentioned purpose, the water pressure-driven three-way valve of the present invention includes a defined valve cavity, a movable valve core is built into the valve cavity, and the valve cavity is equipped with a water inlet, a water outlet, and a pressure relief port that are connected to the valve cavity. The valve is characterized in that the water inlet and the pressure relief port can be selectively connected to the water outlet as the valve core moves, the valve core blocks the water inlet by the elastic force of the spring and the pressure relief port is connected to the water outlet at this time, the valve core overcomes the elastic force of the spring by the water pressure provided to the water inlet and blocks the pressure relief port and the water inlet is connected to the water outlet at this time.

[0006] Accordingly, when extracting coffee, hot water of the required pressure is delivered to the water inlet, and the valve core overcomes the elastic force of the spring by the water pressure provided to the water inlet to block the pressure relief port, and the water inlet and the water outlet are connected at this time, and the water for extraction flows to the extraction device through the three-way valve; after the extraction is completed, the water supply is stopped, the water pressure at the water inlet is reduced, the valve core blocks the water inlet by the elastic force of the spring, and the pressure relief port is connected with the water outlet at this time, and the pressure maintained by the extraction device during the extraction process is released, so the extraction device can be opened to remove the coffee grounds.

[0007] The water pressure-driven three-way valve switches the connection state of the three-way valve by delivering or stopping the delivery of extraction water, which simplifies the control program of the controller, reduces the circuit failure rate, simplifies the circuit layout, and reduces the manufacturing cost.

[0008] Preferably, a channel is maintained between the valve core and the inner wall of the valve cavity. When the valve core blocks the water inlet, the pressure relief port is connected to the water outlet through the channel. When the valve core blocks the pressure relief port, the water inlet is connected to the water outlet through the channel. The channel increases the flowability of the water outlet to the water inlet or the pressure relief port.

[0009] Preferably, the channel corresponds to the water outlet and is provided on the outer wall of the valve core and / or the inner wall of the valve cavity. Accordingly, no matter whether the valve core changes its posture during movement, the channel can always correspond to the water outlet, ensuring the fluidity of the water outlet connecting the water inlet or the pressure relief port.

[0010] Preferably, the water inlet and the pressure relief port are opposite each other, the valve core is located between the water inlet and the pressure relief port, and the water outlet is located on the side of the valve core. Accordingly, the movement of the valve core can directly block the water inlet or the pressure relief port, and when the water inlet is blocked, the pressure relief port is opened, and when the pressure relief port is blocked, the water inlet is opened. The connection state of the three-way valve can be switched by a slight movement of the valve core.

[0011] Preferably, the valve cavity is defined within the valve body, the water inlet, water outlet, and pressure relief port are all provided on the valve body, and the spring acts on the valve core. In the present utility model, in the entire structure constituting the three-way valve, except for the movable valve core and the deformable spring during operation, all structures that are stationary during operation are considered to be the valve body.

[0012] Preferably, in order to facilitate assembly, the valve body includes a first component and a second component that are assembled together, and the first component and the second component are disassembled to open the valve cavity and assemble the valve core and the spring.

[0013] Preferably, the first component has an assembly hole with a latch at its mouth, and the second component is a plug equipped with a latch, the plug is placed in the assembly hole and the latch is latched into the latch to assemble the first component and the second component together, making assembly convenient.

[0014] Preferably, the plug is fixed in the assembly hole by screws to prevent the plug from loosening and shifting.

[0015] Preferably, the elastic force of the spring is adjustable, thereby adjusting the water pressure required to push the valve core away from the water inlet, and after assembly, this adjustment can eliminate differences caused by factors such as assembly and spring differences.

[0016] Preferably, the spring is a helical compression spring, and the valve body includes a threaded adjustment member, which is screwed to adjust the degree of compression of the helical compression spring. Accordingly, the elastic force of the spring can be accurately adjusted by utilizing the stepless transmission characteristics of the thread.

[0017] Preferably, the helical compression spring and the water inlet are located on opposite sides of the valve core, and the helical compression spring and the pressure relief port are located on the same side of the valve core. Thus, the elastic force of the helical compression spring always pushes against the valve core, causing the valve core to block the water inlet. Water pressure supplied to the water inlet acts on the valve core to compress the helical compression spring, causing the valve core to move away from the water inlet and block the pressure relief port.

[0018] In one embodiment, one end of the helical compression spring is supported on the end of the valve core facing the adjusting member, and the other end is supported on the adjusting member. The adjusting member is tubular and communicates with the valve cavity via the pressure relief port. Accordingly, the degree of compression of the helical compression spring can be directly adjusted by turning the adjusting member.

[0019] In another embodiment, one end of the helical compression spring is supported on one end of the valve core facing away from the adjusting member, and the other end is supported on the valve body. The adjusting member is tubular, and its inner end is configured as a water inlet. Accordingly, when the adjusting member is turned, it acts on the valve core, indirectly adjusting the degree of compression of the helical compression spring through the valve core.

[0020] Preferably, the water pressure required to overcome the spring force and cause the valve core to block the pressure relief port is 3-6 bar. This essentially gives the spring elasticity, which is beneficial for opening the water inlet with the incoming extraction water and also helps the spring to reset the valve core when the extraction water supply stops.

[0021] The coffee machine extraction liquid circuit of the present invention includes the aforementioned hydraulically driven three-way valve, wherein the water inlet is connected to a water pump, the water outlet is connected to an extraction device, and the pressure relief port is connected to a wastewater box. Accordingly, the water pump delivers extraction water that meets the hydraulic pressure requirements to the water inlet, causing the water pressure of the extraction water to overcome the elastic force of a spring to open the water inlet, block the pressure relief port, and connect the water inlet and the water outlet, thereby delivering the extraction water to the extraction device for extraction. After extraction is complete, the water pump stops delivering water, reducing the water pressure supplied to the water inlet. The valve core resets due to the elastic force of the spring, opening the pressure relief port, blocking the water inlet, and connecting the pressure relief port to the water outlet, thereby relieving pressure from the extraction device. The connection state of the three-way valve is switched by the water pump delivering or stopping the delivery of extraction water, thereby simplifying the controller's control program, reducing circuit failure rates, simplifying the circuit layout, and lowering manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is an isometric view of a water pressure driven three-way valve according to Example 1 of the present utility model;

[0023] Figure 2 for Figure 1 An orthographic schematic diagram of a water pressure driven three-way valve is shown;

[0024] Figure 3 for Figure 2 A top view of

[0025] Figure 4 for Figure 2 AA sectional view;

[0026] Figure 5 for Figure 3 BB cross-sectional view;

[0027] Figure 6 for Figure 1 The schematic diagram of the structure of the water pressure driven three-way valve is shown;

[0028] Figure 7 for Figure 6 A cross-sectional view of a water pressure driven three-way valve is shown;

[0029] Figure 8 for Figure 4 The schematic diagram shows a water pressure driven three-way valve switched to a state where the valve core blocks the pressure relief port and the water inlet and outlet are connected;

[0030] Figure 9 The utility model is a water pressure driven three-way valve. Figure 4 The status shown is the same as Figure 8 Schematic diagram of intermediate states for switching between the states shown;

[0031] Figure 10 This is a cross-sectional view of a water pressure driven three-way valve according to Example 2 of the present utility model;

[0032] Figure 11 This is a schematic diagram of the water pressure driven three-way valve of Example 2 of the utility model, in which the valve core blocks the pressure relief port and the water inlet is connected to the water outlet;

[0033] Figure 12 This is a schematic diagram of the water path of the coffee machine of the present invention;

[0034] Description of the numbers in the figure:

[0035] 100 valve body, 101 valve chamber, 102 water inlet, 103 water outlet, 104 pressure relief port, 105 channel;

[0036] 110 first component, 111 assembly hole, 112 bayonet,

[0037] 120 second component, 121 clamping column,

[0038] 130 adjustment parts,

[0039] 140 screws;

[0040] 200 valve core;

[0041] 300 spring;

[0042] 401 water tank, 402 flow meter, 403 water pump, 404 first boiler, 405 two-way solenoid valve, 406 second boiler, 407 milk frothing device, 408 water pressure driven three-way valve, 409 extraction device, 410 safety valve, 411 waste water box. DETAILED DESCRIPTION

[0043] To make the purpose, technical solutions, and advantages of the present invention more clear, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0044] The terms "including" and "having" and any variations thereof in the description and claims of the present utility model are intended to cover non-exclusive inclusions. For example, a method or product that includes a series of technical features is not necessarily limited to those technical features clearly listed, and may also include other technical features that are not clearly listed and can be included in the method or product.

[0045] In the description of the present invention, it should be understood that the technical features defined by the terms "first", "second" and other sequential concepts are only for the purpose of clearly describing the defined technical features so that the defined technical features can be clearly distinguished from other technical features, and do not represent such naming in actual implementation. Therefore, it cannot be understood as a limitation on the present invention.

[0046] The present invention is described in detail below with reference to specific embodiments and accompanying drawings.

[0047] Example 1

[0048] like Figure 1-9 The three-way valve shown is driven by water pressure, i.e., it uses the pressure of the supplied water to switch the connection state of the three-way valve. Therefore, it is not an electrically controlled valve, i.e., it does not switch the connection state by means of a motor, electromagnetic, etc. The three-way valve includes a defined valve chamber 101, in which a movable valve core 200 is housed. The valve chamber 101 is provided with a water inlet 102, a water outlet 103, and a pressure relief port 104 that communicate with the valve chamber. The water inlet 102 and the pressure relief port 104 can be selectively connected to the water outlet 103 as the valve core 200 moves. The valve core 200 blocks the water inlet 102 by the elastic force of a spring 300, and the pressure relief port 104 is connected to the water outlet 103. The water pressure supplied to the water inlet 101 overcomes the elastic force of the spring 300, blocking the pressure relief port 104, and the water inlet 102 is connected to the water outlet 103.

[0049] Accordingly, when extracting coffee, hot water of the required pressure is delivered to the water inlet 102, and the valve core 200 overcomes the elastic force of the spring 300 by the water pressure provided to the water inlet to block the pressure relief port 104, and at this time the water inlet 102 is connected to the water outlet 103, and the water for extraction flows to the extraction device through the three-way valve; after the extraction is completed, the water supply is stopped, the water pressure of the water inlet 102 is reduced, and the valve core 200 blocks the water inlet 102 by the elastic force of the spring 300, and at this time the pressure relief port 104 is connected to the water outlet 103, and the pressure maintained by the extraction device during the extraction process is released, so the extraction device can be opened to remove the coffee grounds.

[0050] The three-way valve switches the connection state of the three-way valve by delivering or stopping the delivery of extraction water, thereby realizing water pressure drive, simplifying the control program of the controller, reducing the circuit failure rate, simplifying the circuit layout, and reducing the manufacturing cost.

[0051] In this embodiment, a channel 105 is maintained between the valve core 200 and the inner wall of the valve cavity 101. When the valve core 200 blocks the water inlet 102, the pressure relief port 104 is connected to the water outlet 103 via the channel 105. When the valve core 200 blocks the pressure relief port 104, the water inlet 102 is connected to the water outlet 103 via the channel 105. The channel increases the fluidity of the water outlet connecting the water inlet or the pressure relief port. Specifically, the outer diameter of the valve core 200 is smaller than and close to the inner diameter of the valve cavity 101. Therefore, the valve core can move back and forth under the guidance of the inner wall of the valve cavity and avoid shaking, so as to accurately block the water inlet or the pressure relief port. On this basis, the channel 105 corresponds to the water outlet 103 and is provided on the inner wall of the valve cavity 101, such as Figure 7 As shown, the channel 105 is a groove. Therefore, regardless of whether the valve core changes position during movement, the channel always corresponds to the water outlet, ensuring fluidity between the water outlet and the water inlet or pressure relief port. In other embodiments, the channel can also be provided on the outer wall of the valve core, or on the inner wall of the valve cavity and the outer wall of the valve core.

[0052] In this embodiment, the water inlet 102 and the pressure relief port 104 are opposite each other, the valve core 200 is located between the water inlet 102 and the pressure relief port 104, and the water outlet 103 is located on the side of the valve core 200. Accordingly, the movement of the valve core can directly block the water inlet or the pressure relief port, and when the water inlet is blocked, the pressure relief port is opened, and when the pressure relief port is blocked, the water inlet is opened. The connection state of the three-way valve can be switched by a slight movement of the valve core.

[0053] In this embodiment, a valve chamber 101 is defined within a valve body 100. A water inlet 102, a water outlet 103, and a pressure relief port 104 are all located within the valve body. A spring 300 directly acts on a valve core 200. Within the entire structure of the three-way valve, except for the movable valve core 200 and the deformable spring 300 during operation, all other stationary components are considered the valve body. The first component 110, second component 120, adjustment member 130, screw 140, and sealing ring, described below, constitute the valve body.

[0054] In this embodiment, for ease of assembly, the valve body 100 comprises a first component 110 and a second component 120 that are assembled together. The first and second components are disassembled to open the valve cavity and assemble the valve core and spring. A pressure relief port 104 is formed at the inner end of the second component 120. The first component 110 is provided with a water inlet 102 and a water outlet 103. Furthermore, the first component 110 has an assembly hole 111, with a latch 112 at the mouth of the assembly hole 111. The second component 120 is a plug equipped with a latch 121. The plug is placed in the assembly hole 111, and the latch 121 engages the latch 112, assembling the first and second components together. Therefore, according to the illustrated structure, the valve core 200 and spring 300 are positioned in the valve cavity 101 according to their positional relationship. The plug is placed in the assembly hole 111, causing the spring 300 to deform to apply an initial elastic force to the valve core 200. The clamping column 121 is placed in the clamping hole 112. The plug is then rotated to conveniently assemble the second component with the first component and constrain the valve core 200 and spring 300 within the valve cavity. To prevent the plug from loosening, shifting, or disengaging from the first component, it is locked in the assembly hole with screws 140.

[0055] In this embodiment, the elastic force of the spring 300 is adjustable. Accordingly, the initial elastic force applied by the spring to the valve core and the water pressure that pushes the valve core away from the water inlet can be adjusted. After assembly, this adjustment can eliminate differences caused by factors such as assembly and spring differences.

[0056] In this embodiment, spring 300 is a helical compression spring. Valve body 100 includes an adjusting member 130 threadedly connected to second member 120. Turning adjusting member 130 adjusts the degree of compression of the helical compression spring, thereby adjusting the initial elastic force exerted by the spring on the valve core. Thus, the continuously variable transmission characteristics of the thread can be utilized to accurately adjust the spring force.

[0057] To ensure sealing, a sealing member is provided at the position where the valve core 200 blocks the water inlet 102 and the pressure relief port 104 , a sealing ring is provided between the first component 110 and the second component 120 , and a sealing ring is provided between the adjustment member 130 and the second component 120 .

[0058] In this embodiment, the spring 300 and the water inlet 102 are located on either side of the valve core 200, while the spring 300 and the pressure relief port 104 are located on the same side of the valve core 200. Thus, the spring's elastic force always pushes against the valve core, causing it to block the water inlet. Water pressure supplied to the water inlet acts on the valve core, compressing the spring and causing the valve core to move away from the water inlet, blocking the pressure relief port.

[0059] In this embodiment, one end of the spring 300 is supported by the end of the valve core 200 facing the adjusting member 130, and the other end is supported by the adjusting member 130. That is, the spring 300 is located between the valve core 200 and the adjusting member 130. The adjusting member 130 is tubular and communicates with the valve cavity 101 via the pressure relief port 104. Accordingly, the degree of spring compression, that is, the initial elastic force exerted by the spring on the valve core, can be directly adjusted by turning the adjusting member.

[0060] Preferably, the water pressure required to overcome the spring force and block the valve core against the pressure relief port is 3-6 bar. This provides the spring with elasticity, which facilitates opening the water inlet with the delivered extraction water and also facilitates the spring to reset the valve core when the delivery of extraction water is stopped.

[0061] The three-way valve of this embodiment is in the natural state. Figure 4 In the state shown, the valve core 200 blocks the water inlet 102 by the elastic force of the spring 300 and the pressure relief port 104 is connected to the water outlet 103. When extracting coffee, pressurized water is delivered to the water inlet 102, and the valve core 200 is as shown. Figure 8 As shown, the water pressure supplied to the water inlet overcomes the elastic force of the spring 300 to block the pressure relief port 104. At this time, the water inlet 102 is connected to the water outlet 103, and the pressurized water delivered by the water pump flows to the extraction device through the three-way valve. After the extraction is completed, the water supply to the water inlet 102 is stopped, and the valve core 200 passes through the spring 300. Figure 9 The status shown is Figure 4 The status shown is reset, Figure 9 In the state shown, the water inlet 102 and the water outlet 103 are both connected to the pressure relief port 104 to relieve the pressure, prompting the valve core 200 to quickly reset. To adjust the initial elastic force exerted by the spring 300 on the valve core 200, use a tool such as a screwdriver to screw the adjustment member 130 to directly adjust the degree of compression of the helical compression spring. Figure 4 、 Figure 8 、 Figure 9 The dotted line with an arrow indicates the path of the water flow, and the direction of the arrow indicates the direction of the water flow.

[0062] Example 2

[0063] like Figure 10-11As shown, this embodiment differs from Example 1 in that the positional relationship between the spring 300, the water inlet 102, and the pressure relief port 104 has changed. In this embodiment, one end of the helical compression spring is supported on the end of the valve core 200 facing away from the adjusting member 130, and the other end is supported on the first component 110 of the valve body. Specifically, the spring 300 is located between the valve core 200 and the first component 110. The adjusting member 130 is tubular, and its inner end is configured as the water inlet 102. The first component 110 is configured with the pressure relief port 104 and the water outlet 103. Consequently, when the adjusting member 130 is turned, the inner end of the adjusting member 130 acts on the valve core 200, indirectly adjusting the degree of compression of the helical compression spring through the valve core 200.

[0064] The three-way valve of this embodiment is in the natural state. Figure 10 In the state shown, the valve core 200 blocks the water inlet 102 at the inner end of the regulating member 130 by the elastic force of the spring 300 and the pressure relief port 104 is connected to the water outlet 103. When extracting coffee, pressurized water is delivered to the water inlet 102, and the valve core 200 is as shown. Figure 11 As shown, the water pressure supplied to the water inlet overcomes the elastic force of the spring 300 to block the pressure relief port 104 and the water inlet 102 is now connected to the water outlet 103. The water pump supplies water to the extraction device through the three-way valve. After the extraction is completed, the water supply to the water inlet is stopped, and the valve core 200 is opened to the water outlet under the action of the spring 300. Figure 10 To adjust the initial elastic force exerted by the spring on the valve core, use a tool such as a screwdriver to screw the adjusting member 130, and indirectly adjust the degree of compression of the helical compression spring through the valve core 200. Figure 10 、 Figure 11 The dotted line with an arrow indicates the path of the water flow, and the direction of the arrow indicates the direction of the water flow.

[0065] The rest of the structure of this embodiment is the same as that of embodiment 1 and will not be described in detail.

[0066] When the three-way valves of the above embodiments are applied to the extraction liquid path of a coffee machine, Figure 12As shown, the water inlet 102 is connected to the water pump 403, the water outlet 103 is connected to the extraction device 409, and the pressure relief port 104 is connected to the wastewater box 411. Accordingly, the water pump 403 delivers extraction water that meets the hydraulic pressure requirements from the water tank 401 to the water inlet 102. The water is heated to the required temperature in the boiler. The hydraulic pressure of the extraction water overcomes the elastic force of the spring 300, opening the water inlet 102 and blocking the pressure relief port 104, connecting the water inlet 102 with the water outlet 103. The extraction water is then driven by the hydraulic pressure of the three-way valve 408 and delivered to the extraction device 409 for extraction. After extraction is complete, the water pump stops delivering water, reducing the water pressure supplied to the water inlet. The valve core 200 returns to its original position due to the elastic force of the spring 300, opening the pressure relief port 104, blocking the water inlet 102, connecting the pressure relief port 104 with the water outlet 103, and relieving pressure in the extraction device 409. In this manner, the connection state of the three-way valve is switched by switching the pump's delivery or cessation of extraction water, achieving hydraulic actuation. This simplifies the controller's control program, reduces circuit failure rates, simplifies the circuit layout, and reduces manufacturing costs. Flowmeter 402 measures water volume. Safety valve 410 relieves pressure when water pressure is excessive. Milk frothing device 407 is used to froth milk. First boiler 404 provides hot water, and second boiler 406 heats the hot water provided by first boiler 404 into steam. Therefore, during use, opening two-way solenoid valve 405 delivers steam to the milk frothing device, while closing two-way solenoid valve 405 prevents steam from being delivered to the milk frothing device.

Claims

1. A water pressure driven three-way valve, comprising a defined valve chamber (101), a movable valve core (200) built into the valve chamber (101), a water inlet (102), a water outlet (103), and a pressure relief port (104) connected to the valve chamber, wherein: The water inlet (102) and the pressure relief port (104) can be selectively connected to the water outlet (103) as the valve core (200) moves. The valve core (200) blocks the water inlet (102) by the elastic force of the spring (300), and at this time the pressure relief port (104) is connected to the water outlet (103). The valve core (200) overcomes the elastic force of the spring (300) by the water pressure provided to the water inlet (102), blocks the pressure relief port (104), and at this time the water inlet (102) is connected to the water outlet (103).

2. The water pressure driven three-way valve according to claim 1, characterized in that: A channel (105) is maintained between the valve core (200) and the inner wall of the valve cavity (101). When the valve core (200) blocks the water inlet (102), the pressure relief port (104) is communicated with the water outlet (103) via the channel (105). When the valve core (200) blocks the pressure relief port (104), the water inlet (102) is communicated with the water outlet (103) via the channel (105).

3. The water pressure driven three-way valve according to claim 2, characterized in that: The channel (105) corresponds to the water outlet (103) and is provided on the outer wall of the valve core (200) and / or the inner wall of the valve cavity (101).

4. The water pressure driven three-way valve according to claim 1, characterized in that: The water inlet (102) and the pressure relief port (104) are opposite to each other, the valve core (200) is located between the water inlet (102) and the pressure relief port (104), and the water outlet (103) is located on the side of the valve core (200).

5. The water pressure driven three-way valve according to claim 1, characterized in that: The valve cavity (101) is defined in the valve body (100), the water inlet (102), the water outlet (103), and the pressure relief port (104) are all provided in the valve body, and the spring (300) acts on the valve core (200).

6. The water pressure driven three-way valve according to claim 5, characterized in that: The valve body (100) comprises a first component (110) and a second component (120) which are assembled together. The first component and the second component are disassembled to open the valve chamber (101), and a valve core (200) and a spring (300) are assembled.

7. The water pressure driven three-way valve according to claim 6, characterized in that: The first component (110) has an assembly hole (111), and a bayonet (112) is provided at the mouth of the assembly hole (111). The second component (120) is a plug equipped with a clamping column (121). The plug is placed in the assembly hole (111) and the clamping column (121) is clamped into the bayonet (112) to assemble the first component and the second component together.

8. The water pressure driven three-way valve according to claim 7, characterized in that: The plug is locked and fixed in the assembly hole (111) by a screw (140).

9. The water pressure driven three-way valve according to any one of claims 1 to 8, characterized in that: The elastic force of the spring (300) can be adjusted.

10. The water pressure driven three-way valve according to claim 9, characterized in that: The spring (300) is a helical compression spring, and the valve body (100) includes a threaded adjustment member (130). The adjustment member (130) is screwed to adjust the degree of compression of the helical compression spring.

11. The water pressure driven three-way valve according to claim 10, characterized in that: The helical compression spring and the water inlet (102) are located on both sides of the valve core (200), and the helical compression spring and the pressure relief port (104) are located on the same side of the valve core (200).

12. The water pressure driven three-way valve according to claim 11, characterized in that: One end of the helical compression spring is supported on one end of the valve core (200) facing the regulating member (130), and the other end is supported on the regulating member (130). The regulating member (130) is tubular and communicates with the valve cavity through the pressure relief port.

13. The water pressure driven three-way valve according to claim 11, characterized in that: One end of the helical compression spring is supported on one end of the valve core (200) facing away from the regulating member (130), and the other end is supported on the valve body (100). The regulating member (130) is tubular and its inner end is configured as a water inlet (102).

14. The water pressure driven three-way valve according to claim 1, characterized in that: The water pressure required to overcome the elastic force of the spring (300) and block the pressure relief port with the valve core is 3-6 bar.

15. A coffee machine extraction liquid circuit, characterized by: It comprises the water pressure driven three-way valve (408) according to any one of claims 1 to 14, wherein the water inlet (102) is connected to the water pump (403), the water outlet (103) is connected to the extraction device (409), and the pressure relief port (104) is connected to the waste water box (411).

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