Feed pump three-way valve

Abstract

The utility model discloses a three-way valve of a water feeding pump, relates to the field of water feeding pipeline control equipment, and aims at solving the problems that an existing integrated valve cage is high in machining cost and difficult to maintain, and a flow channel is prone to turbulent abrasion. The valve comprises a main valve body assembly, a main valve element assembly, a recirculation valve body assembly, a recirculation valve element assembly and a recirculation valve cage. The main valve body assembly is provided with a water inlet, a water outlet, a bypass connector and a main valve cavity. The main valve element assembly is matched with the main valve seat. The recirculation valve body assembly is connected with a bypass interface, and a valve cavity is connected with a recirculation valve inlet / outlet; the recirculation valve core assembly is in transmission fit with the main valve core assembly and is provided with at least two pressure reducing flanges; the recirculation valve cage is composed of a plurality of axially connected valve cage units, and a valve seat flange is arranged on the inner circumference of each unit. Opening and closing of the recirculation valve can be achieved through sliding of the valve element, the machining and maintaining cost is reduced through the sectional type valve cage, the flow state is optimized through the multi-stage pressure reduction channel, and sealing and reliability are improved.

Description

Technical Field

[0001] This application relates to the field of water supply pipeline control equipment, and more particularly to a three-way valve for a water supply pump. Background Technology

[0002] In industrial pump systems, especially in feedwater pumps used in thermal power plants, chemical plants, or water treatment facilities, the feedwater pump three-way valve (or automatic recirculation pump protection valve) plays a crucial role. When the main pump starts up, stops, or operates at low load, the flow rate may fall below the minimum safe value. At this time, the valve body automatically senses the flow change and, through an internal mechanism (such as a spring and piston), drives the main valve core to move, opening the bypass channel and guiding some high-pressure fluid from the pump outlet back to the inlet, forming a recirculation loop. This process maintains the pump's minimum flow rate, preventing cavitation, overheating, or mechanical damage, and ensuring stable system operation. This valve is typically integrated into the pump outlet pipe, requiring no external control signal, and relies on fluid dynamics for self-regulation. It is widely used in high-pressure boiler feedwater, cooling circulation, and other scenarios to improve equipment lifespan and energy efficiency. While simple to operate and highly reliable, it relies on precise mechanical design to respond to flow changes.

[0003] However, existing technologies have significant drawbacks, particularly in the structural design of the bypass valve core and bypass valve cage. As disclosed in patent CN201520354384.7, the bypass valve cage uses an integrated structure with extremely small assembly clearance between it and the bypass valve core, requiring high-precision machining and strict tolerance control, resulting in high manufacturing costs and complex processes. Simultaneously, while the repeatedly bending pressure-reducing flow channel formed by the pressure-reducing flange and the valve seat flange can achieve multi-stage pressure reduction, it easily causes fluid turbulence, localized wear, or blockage risks. With long-term use, friction between the valve core and the valve cage intensifies, affecting sealing performance and response speed. Furthermore, the integrated design makes disassembly and maintenance difficult, requiring specialized tools and considerable time, increasing downtime losses and maintenance costs. Under high-pressure and high-flow conditions, it is more prone to jamming or leakage failures, limiting the valve's reliability and service life. Utility Model Content

[0004] To address the shortcomings of existing technologies, this application provides a three-way valve for a water supply pump.

[0005] To achieve the above objectives, the technical solution of this application is as follows: A three-way valve for a water pump, comprising: a main valve body assembly having an inlet, an outlet, and a bypass interface, and a main valve cavity connecting the inlet, outlet, and bypass interface, wherein a main valve seat is provided within the main valve cavity; a main valve core assembly disposed within the main valve cavity and cooperating with the main valve seat; a recirculation valve body assembly connected to the bypass interface and having a recirculation valve inlet and a recirculation valve outlet, and a recirculation valve cavity connecting the recirculation valve inlet and recirculation valve outlet, wherein the recirculation valve inlet is kept in communication with the inlet through the main valve cavity; and a recirculation valve core assembly. The component is disposed within the recirculation valve cavity and is driven and engaged with the main valve core assembly so that it can slide along the axial direction of the recirculation valve. It has at least two pressure-reducing flanges. The recirculation valve cage has valve cage units with a number of pressure-reducing flanges. Several valve cage units are sequentially connected and sleeved on the outside of the recirculation valve core assembly along the axial direction. Each valve cage unit has a valve seat flange protruding on its inner circumference. The recirculation valve core assembly slides along the axial direction of the recirculation valve to have a recirculation valve closed position where the pressure-reducing flange and the valve seat flange abut against each other to form a sealing fit, and a recirculation valve open position where a pressure-reducing channel is formed between the pressure-reducing flange and the valve seat flange.

[0006] Furthermore, the side of the valve seat flange closest to the recirculation valve inlet is a first conical surface, and the outer periphery of the pressure reducing flange is in sealing fit with the first conical surface.

[0007] Furthermore, the main valve core assembly includes a guide post, the recirculation valve cage includes a guide valve cage, the guide valve cage is connected to one end of several valve cage units near the recirculation valve inlet, the guide valve cage is provided with a guide sleeve that cooperates with the guide post, and an overflow port is formed between the guide posts.

[0008] Furthermore, the pressure reducing flange has a second conical surface on the side near the recirculation valve inlet, the inner circumference of the guide valve cage has a horn-shaped third conical surface on the side near the recirculation valve outlet, and the valve seat flange has a horn-shaped fourth conical surface on the side near the recirculation valve outlet.

[0009] Furthermore, the slope of the second conical surface is less than that of the third conical surface surrounding its outer periphery, so that a pressure-reducing channel with a gradually increasing distance from the recirculation valve inlet to the recirculation valve outlet is formed between the second conical surface and the mating third or fourth conical surface.

[0010] The slope of the second conical surface is less than the slope of the fourth conical surface surrounding its outer periphery, so that a pressure-reducing channel with a gradually increasing distance from the recirculation valve inlet to the recirculation valve outlet is formed between the second conical surface and the mating fourth conical surface.

[0011] Furthermore, the slope of the second conical surface is uniform, and the slopes of the third and fourth conical surfaces gradually decrease from the recirculation valve inlet to the recirculation valve outlet.

[0012] Furthermore, a sealing ring is provided between the guide valve cage and the adjacent valve cage unit, which are connected by the positioning protrusion and positioning groove on the axial end face; a sealing ring is provided between the positioning protrusion and positioning groove on the axial end face of the adjacent valve cage unit; an abutting fixing component is provided at one end of the recirculation valve cage near the outlet of the recirculation valve, and the abutting fixing component is fixedly connected to the recirculation valve body assembly.

[0013] Furthermore, the abutment fixing assembly includes a throttle plate and a fixing seat, the fixing seat being detachably and fixedly connected to the recirculation valve body assembly, and the throttle plate being fixed between the fixing seat and the recirculation valve cage.

[0014] Furthermore, the fixed seat and the recirculation valve body assembly are fastened together by bolts, and elastic compensation components are provided between the throttle plate and the recirculation valve cage and / or between the throttle plate and the fixed seat.

[0015] Furthermore, the maximum outer diameter of the pressure-reducing flange gradually decreases from the recirculation valve inlet to the recirculation valve outlet, and the minimum inner diameter of the valve seat flange gradually decreases from the recirculation valve inlet to the recirculation valve outlet. Moreover, the maximum outer diameter of the pressure-reducing flange is greater than that of the valve seat flange located on the side closer to the recirculation valve inlet.

[0016] The beneficial effects of this application are as follows: By adopting a segmented recirculation valve cage structure, the shortcomings of existing technologies, such as high precision requirements and high manufacturing costs associated with integrated valve cages, are effectively overcome. Each valve cage unit can be independently processed and assembled, significantly reducing reliance on the precision of individual parts and overall manufacturing costs. The multi-stage pressure-reducing channels formed by the cooperation between the pressure-reducing flange and the valve seat flange on each valve cage unit optimize the fluid flow path, reducing the risks of turbulence, localized wear, and blockage caused by traditional repeatedly bending flow channels, and improving the smoothness of valve core movement and sealing reliability. The segmented design also greatly facilitates disassembly and maintenance, allowing for quick replacement of specific valve cage units or internal components without the need for specialized tools, thus reducing maintenance costs. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0018] Figure 1 A three-way valve for a water supply pump is provided in one embodiment of this application;

[0019] Figure 2 forFigure 1 Enlarged diagram of part A in the middle;

[0020] Figure 3 This is a schematic diagram of the mating structure of the recirculation valve core assembly and the recirculation valve cage in one embodiment of this application;

[0021] In the diagram, 11-inlet, 12-outlet, 13-main valve body, 14-main valve cover, 15-main valve seat, 21-main valve guide post, 22-main valve stem, 23-main valve disc, 24-main valve spring, 25-main valve guide ring; 31-recirculation valve cover, 311-recirculation valve inlet, 32-recirculation valve body; 321-recirculation valve outlet, 4-recirculation valve core assembly, 41-pressure reducing flange, 411-second cone surface, 42-recirculation guide post; 5-valve cage unit, 51-valve seat flange, 511-first cone surface, 512-fourth cone surface, 6-guide valve cage, 61-guide sleeve, 62-flow port, 63-third cone surface, 7-throttle plate, 8-elastic compensation component, 9-fixed seat, 101-lever, 102-top rod. Detailed Implementation

[0022] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0024] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0025] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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 application.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0027] In this application, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0028] It should be noted that in this application, the words "in some embodiments," "exemplarily," and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "in some embodiments," "exemplarily," or "for example" should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of words such as "in some embodiments," "exemplarily," and "for example" is intended to present related concepts in a specific manner, meaning that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of this application. The appearance of the above words in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0029] This application provides a three-way valve for a water supply pump, such as... Figure 1As shown: The system includes a main valve body assembly with an inlet 11, an outlet 12, and a bypass interface; a main valve chamber connecting the inlet 11, outlet 12, and bypass interface; a main valve seat 15 within the main valve chamber; a main valve core assembly disposed within the main valve chamber and cooperating with the main valve seat 15; and a recirculation valve body assembly connected to the bypass interface and having a recirculation valve inlet 311 and a recirculation valve outlet 321; and a recirculation valve chamber connecting the recirculation valve inlet 311 and the recirculation valve outlet 321. The recirculation valve inlet 311 passes through… The main valve chamber is kept in communication with the inlet 11; the recirculation valve core assembly 4 is disposed in the recirculation valve chamber and is driven to cooperate with the main valve core assembly so that it can slide along the axial direction of the recirculation valve, and it is provided with at least two pressure reducing flanges 41; the recirculation valve cage is provided with several valve seat flanges 51, and the recirculation valve core assembly 4 slides along the axial direction of the recirculation valve to have a recirculation valve closed position where the pressure reducing flanges 41 and the valve seat flanges 51 abut against each other to form a sealing cooperation, and a recirculation valve open position where a pressure reducing channel is formed between the pressure reducing flanges 41 and the valve seat flanges 51.

[0030] Specifically, in some embodiments of this application, such as Figure 1 As shown, the main valve body assembly is composed of the main valve body 13 and the main valve cover 14 connected together to form the main valve cavity. The inlet 11 and the bypass interface are provided on the main valve body 13, and the main valve seat 15 is formed on the main valve body 13. The outlet 12 is provided on the main valve cover 14. The main valve body 13 and the main valve cover 14 are fixedly connected by a flange.

[0031] Specifically, in some embodiments of this application, such as Figure 1 As shown, the main valve core assembly includes a main valve guide post 21, a main valve stem 22, a main valve disc 23, a main valve spring 24, and a main valve guide ring 25. The main valve guide post 21 and the main valve guide ring 25 are respectively fixed inside the main valve cover 14 and the main valve body 13. The upper end of the main valve stem 22 has a blind hole adapted to the main valve guide post 21, which is sleeved outside the main valve guide post 21, and the main valve spring 24 is located between the main valve stem 22 and the main valve guide post 21. The main valve guide ring 25 provides a guiding and limiting function at the lower end of the main valve stem 22, allowing it to slide only longitudinally. The main valve disc 23 is welded and fixed to the main valve stem 22. The main valve disc 23 is located above the main valve seat 15. When the main valve stem 22 slides longitudinally, it drives the main valve disc 23 to move closer to or away from the main valve seat 15. When the fluid pressure at the inlet 11 is large, it pushes the main valve disc 23 and the main valve stem 22 to move upward, forming a main valve passage with a large flow rate. When the fluid pressure at the inlet 11 is small, under the action of the main valve spring 24, the main valve disc 23 and the main valve stem 22 move downward, forming a main valve passage with a small flow rate or even completely closed.

[0032] Specifically, in some embodiments of this application, such as Figure 1 As shown, the recirculation valve body assembly consists of a recirculation valve cover 31 and a recirculation valve body 32 connected together, forming a recirculation valve cavity. Specifically, the recirculation valve cover 31 is connected to the bypass interface of the main valve body 13 and has a recirculation valve inlet connecting the main valve cavity and the recirculation valve cavity. The recirculation valve body 32 is connected to the outer end of the bypass interface of the main valve body 13, and its outer end is the recirculation valve outlet. Specifically, the recirculation valve body 32 is connected to the outer wall of the main valve body 13 via a flange, and the recirculation valve cover 31 is fixed and limited between the recirculation valve body 32 and the main valve body 13.

[0033] The recirculation valve cavity is provided with a recirculation valve core assembly 4 and a recirculation valve cage. The recirculation valve cage is fixed in position relative to the recirculation valve body assembly. The recirculation valve core assembly 4 can slide along its axial direction relative to the recirculation valve body assembly. The recirculation valve core assembly 4 and the main valve stem 22 are connected by a lever 101 and a push rod 102. The specific structure is basically the same as that disclosed in the prior art CN201520354384.7, and will not be described in detail here.

[0034] To address the problems in related technologies, this application primarily improves the structure of the recirculation valve core assembly 4 and the recirculation valve cage. Specifically, for example... Figure 2 As shown, the recirculation valve cage has a number of valve cage units 5 corresponding to the number of pressure-reducing flanges 41. Several valve cage units 5 are sequentially connected and sleeved around the recirculation valve core assembly 4 along the axial direction. Each valve cage unit 5 has a protrusion on its inner circumference to form a valve seat flange 51. The recirculation valve core assembly 4 slides along the axial direction of the recirculation valve to have a recirculation valve closed position where the pressure-reducing flange 41 and the valve seat flange 51 abut against each other to form a sealing fit, and a recirculation valve open position where a pressure-reducing channel is formed between the pressure-reducing flange 41 and the valve seat flange 51. In the embodiment shown in the figure, there are 3 pressure-reducing flanges 41, and 3 valve cage units 5 are provided accordingly, forming 3 valve seat flanges 51, which fit one-to-one with the pressure-reducing flanges 41.

[0035] The embodiments of this application reduce the requirements for machining accuracy, reduce assembly tolerance issues, and improve the convenience of maintenance by designing several separate valve cage units 5.

[0036] Alternatively, in some embodiments, such as Figure 3 As shown, the side of the valve seat flange 51 closest to the recirculation valve inlet 311 is a first conical surface 511, and the outer periphery of the pressure reducing flange 41 is in a sealing fit with the first conical surface 511. This design enhances the sealing performance through conical surface contact, ensuring no leakage under high pressure conditions; at the same time, the inclination angle of the first conical surface 511 optimizes fluid guidance and reduces eddy current generation.

[0037] Optionally, in some embodiments, the main valve core assembly includes a guide post 21, the recirculation valve cage includes a guide valve cage 6, the guide valve cage 6 is connected to one end of a plurality of valve cage units 5 near the recirculation valve inlet 311, the guide valve cage 6 is provided with a guide sleeve 61 that cooperates with the guide post 21, and an overflow port 62 is formed between the guide posts 21.

[0038] Optionally, in some embodiments, the pressure-reducing flange 41 has a second conical surface 411 on the side near the recirculation valve inlet 311, the inner circumference of the guide valve cage 6 has a flared third conical surface 63 on the side near the recirculation valve outlet 321, and the valve seat flange 51 has a flared fourth conical surface 512 on the side near the recirculation valve outlet 321. A gradually expanding flow channel is formed between the second conical surface 411 and the third / fourth conical surface 63. This achieves smooth pressure reduction, reducing energy loss and noise.

[0039] Optionally, in some embodiments, the slope of the second conical surface 411 is less than the slope of the third conical surface 63 / fourth conical surface 512 surrounding its outer periphery, so that a pressure-reducing channel with a gradually increasing distance from the recirculation valve inlet 311 to the recirculation valve outlet 321 is formed between the second conical surface 411 and the mating third conical surface 63 / fourth conical surface 512. This achieves linear pressure reduction; the slope difference ensures the gradual expansion of the flow channel.

[0040] Optionally, in some embodiments, the slope of the second conical surface 411 is uniform, and the slopes of the third conical surface 63 and the fourth conical surface 512 gradually decrease from the recirculation valve inlet 311 to the recirculation valve outlet 321. For example... Figure 3 As shown, the included angle between the second conical surface 411 and the mating third conical surface 63 / fourth conical surface 512 is α1, α2, α3 from the recirculation valve inlet 311 to the recirculation valve outlet 321, respectively, where α1 < α2 < α3. The change in slope optimizes the pressure reduction gradient; the tapered design effectively promotes the decrease in fluid pressure.

[0041] Optionally, in some embodiments, a sealing ring is provided between the end faces of the guide valve cage 6 and the adjacent valve cage unit 5, which are connected and fitted by a positioning protrusion and a positioning groove on the axial end face; a sealing ring is provided between the end faces of the adjacent valve cage units 5, which are connected and fitted by a positioning protrusion and a positioning groove on the axial end face; an abutment fixing component is provided at one end of the recirculation valve cage near the recirculation valve outlet 321, and the abutment fixing component is fixedly connected to the recirculation valve body assembly. The positioning mechanism ensures assembly stability; the sealing ring prevents leakage.

[0042] Optionally, in some embodiments, the abutment fixing assembly includes a throttle plate 7 and a fixing seat 9, the fixing seat 9 being detachably and fixedly connected to the recirculation valve body assembly, and the throttle plate 7 being fixed between the fixing seat 9 and the recirculation valve cage. The detachable connection facilitates adjustment and subsequent maintenance and replacement.

[0043] Optionally, in some embodiments, the fixed seat 9 is fastened to the recirculation valve body assembly by bolts, and an elastic compensation element 8 is provided between the throttle plate 7 and the recirculation valve cage and / or between the throttle plate 7 and the fixed seat 9. The elastic compensation element 8 absorbs thermal expansion and vibration, and compensates for assembly errors. Specifically, the elastic compensation element 8 is preferably a disc spring assembly.

[0044] Optionally, in some embodiments, the maximum outer diameter of the pressure-reducing flange 41 gradually decreases from the recirculation valve inlet 311 to the recirculation valve outlet 321, and the minimum inner diameter of the valve seat flange 51 gradually decreases from the recirculation valve inlet 311 to the recirculation valve outlet 321. Furthermore, the maximum outer diameter of the pressure-reducing flange 41 is smaller than the minimum inner diameter of the valve seat flange 51 located on its side closest to the recirculation valve inlet, ensuring normal assembly and disassembly. The synchronized change in the maximum outer diameter of the pressure-reducing flange 41 and the minimum inner diameter of the valve seat flange 51 improves pressure reduction efficiency.

[0045] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A three-way valve for a water supply pump, characterized in that, include: The main valve body assembly includes an inlet, an outlet, and a bypass interface, as well as a main valve cavity connecting the inlet, outlet, and bypass interface, and a main valve seat is provided inside the main valve cavity. The main valve core assembly is located inside the main valve cavity and mates with the main valve seat; The recirculation valve body assembly is connected to the bypass interface and has a recirculation valve inlet and a recirculation valve outlet, as well as a recirculation valve chamber that connects the recirculation valve inlet and the recirculation valve outlet. The recirculation valve inlet is connected to the water inlet through the main valve chamber. The recirculation valve core assembly is disposed in the recirculation valve cavity and is drivenly engaged with the main valve core assembly so that it can slide along the axial direction of the recirculation valve. It is provided with at least two pressure reducing flanges. The recirculation valve cage has a number of cage units equal to the number of pressure-reducing flanges. Several cage units are sequentially connected and sleeved around the recirculation valve core assembly along the axial direction. Each cage unit has a valve seat flange protruding on its inner circumference. The recirculation valve core assembly slides along the axial direction of the recirculation valve to have a recirculation valve closed position where the pressure-reducing flange and the valve seat flange abut against each other to form a sealing fit, and a recirculation valve open position where a pressure-reducing channel is formed between the pressure-reducing flange and the valve seat flange.

2. The three-way valve for a water supply pump according to claim 1, characterized in that, include: The valve seat flange has a first conical surface on the side near the recirculation valve inlet, and the outer periphery of the pressure reducing flange is in a sealing fit with the first conical surface.

3. The three-way valve for a water supply pump according to claim 1, characterized in that, include: The main valve core assembly includes a guide post, and the recirculation valve cage includes a guide valve cage. The guide valve cage is connected to one end of several valve cage units near the inlet of the recirculation valve. The guide valve cage is provided with a guide sleeve that cooperates with the guide post, and an overflow port is formed between the guide posts.

4. The three-way valve for a water pump according to claim 3, characterized in that, include: The pressure reducing flange has a second conical surface on the side near the recirculation valve inlet, the inner circumference of the guide valve cage has a horn-shaped third conical surface on the side near the recirculation valve outlet, and the valve seat flange has a horn-shaped fourth conical surface on the side near the recirculation valve outlet.

5. The three-way valve for a water pump according to claim 4, characterized in that, include: The slope of the second conical surface is less than that of the third conical surface surrounding its outer periphery, so that a pressure-reducing channel with a gradually increasing distance from the recirculation valve inlet to the recirculation valve outlet is formed between the second conical surface and the mating third or fourth conical surface. The slope of the second conical surface is less than the slope of the fourth conical surface surrounding its outer periphery, so that a pressure-reducing channel with a gradually increasing distance from the recirculation valve inlet to the recirculation valve outlet is formed between the second conical surface and the mating fourth conical surface.

6. The three-way valve for a water pump according to claim 4 or 5, characterized in that, The slope of the second conical surface is uniform, and the slope of the third and fourth conical surfaces gradually decreases from the recirculation valve inlet to the recirculation valve outlet.

7. The three-way valve for a water supply pump according to any one of claims 3-5, characterized in that, The guide valve cage and the adjacent valve cage unit are connected by a positioning protrusion and a positioning groove on the axial end face, and a sealing ring is provided between the end faces. A sealing ring is provided between the locating protrusion and locating groove on the axial end face of adjacent valve cage units, which form a fit and are connected. The recirculation valve cage is provided with an abutting and fixing component at one end near the recirculation valve outlet, and the abutting and fixing component is fixedly connected to the recirculation valve body assembly.

8. The three-way valve for a water pump according to claim 7, characterized in that, The abutment fixing assembly includes a throttle plate and a fixing seat. The fixing seat is detachably and fixedly connected to the recirculation valve body assembly. The throttle plate is fixed between the fixing seat and the recirculation valve cage.

9. The three-way valve for a water supply pump according to claim 8, characterized in that, The fixed seat and the recirculation valve body assembly are fastened together by bolts, and elastic compensation components are provided between the throttle plate and the recirculation valve cage and / or between the throttle plate and the fixed seat.

10. The three-way valve for a water supply pump according to any one of claims 1-5, characterized in that, The maximum outer diameter of the pressure-reducing flange gradually decreases from the recirculation valve inlet to the recirculation valve outlet, and the minimum inner diameter of the valve seat flange gradually decreases from the recirculation valve inlet to the recirculation valve outlet. Furthermore, the maximum outer diameter of the pressure-reducing flange is smaller than the minimum inner diameter of the valve seat flange located on the side of it closest to the recirculation valve inlet.

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