A control valve and valve assembly

Abstract

This utility model discloses a control valve and valve assembly. The control valve includes a valve body and a water stop component. The valve body is provided with an inlet and an outlet. The water stop component is used to control the opening or closing of the inlet. The first end of the water stop component facing the inlet is provided with a vortex structure. When the water stop component controls the inlet to open, the vortex structure guides the water flow to form a vortex area. The vortex fluid generated by the vortex area flushes the sealing surface between the water stop component and the inlet, thereby reducing the formation of scale on the sealing surface and reducing the probability of sediment remaining on the sealing surface. This greatly reduces the probability of the water stop component becoming stuck and failing due to scale deposition and sediment retention.

Description

Technical Field

[0001] This utility model relates to the field of valve bodies, and in particular to a control valve and valve assembly. Background Technology

[0002] Currently, in the field of fluid control valves, especially common valve products such as solenoid valves, reliability defects caused by water quality issues are prevalent. When applied to water environments with high turbidity and hardness, existing valve structures face a dual technical challenge: First, suspended sediment particles in the water easily deposit on the critical sealing surfaces of the valve, not only hindering the normal movement of the water-stopping components but also causing wear on the sealing surfaces, resulting in incomplete valve closure and continuous leakage; second, calcium and magnesium ions in the water crystallize and precipitate inside the valve body, especially forming stubborn scale in the dynamic sealing area between the water-stopping components and the valve body. The accumulation of this mineral gradually increases the resistance to movement, eventually causing the valve to completely seize up and lose its sealing function. Utility Model Content

[0003] This utility model addresses the technical problems existing in the prior art by providing a control valve and valve assembly. By improving the structure of the water-stopping element, it enables the formation of vortex-shaped water droplets when the water is turned on, thereby reducing scale formation and lowering the probability of sediment remaining on the sealing surface.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a control valve, including a valve body and a water stop component. The valve body is provided with an inlet and an outlet. The water stop component is used to control the opening or closing of the inlet. The first end of the water stop component facing the inlet is provided with a vortex structure. When the water stop component controls the inlet to open, the vortex structure guides the water flow to form a vortex region, and uses the vortex fluid generated by the vortex region to flush the sealing mating surface between the water stop component and the inlet.

[0005] In a preferred embodiment, the end face of the first end of the water stop member protrudes into the inlet to form a flow guide protrusion, and there is a gap between the periphery of the flow guide protrusion and the periphery of the inner wall of the inlet; the swirling structure is disposed on the flow guide protrusion.

[0006] In a preferred embodiment, the radial dimension of the guide protrusion gradually decreases from the second end to the first end of the waterstop, so that the guide protrusion is conical or frustum-shaped; the first end and the second end of the waterstop are the two opposite ends of the waterstop in the axial direction.

[0007] In a preferred embodiment, the swirling structure includes a plurality of spiral guide grooves disposed on the end face of the first end of the waterstop and spaced apart along the circumferential direction of the waterstop. The plurality of spiral guide grooves are arranged in the same spiral direction, and the first ends of the plurality of spiral guide grooves are close to each other, and the second ends of the plurality of spiral guide grooves all extend toward the edge of the first end of the waterstop.

[0008] In a preferred embodiment, the valve body has a sealing boss at the water inlet, and the water-stopping element has multiple sealing surfaces for contacting and engaging with the sealing boss to achieve a seal. The multiple sealing surfaces are arranged sequentially from the outside to the inside along the radial direction of the water-stopping element.

[0009] In a preferred embodiment, the multiple sealing surfaces include an end face sealing surface and an inclined sealing surface. The end face sealing surface is perpendicular to the axis of the water-stopping element. The first end of the inclined sealing surface is connected to the inner edge of the end face sealing surface, and the second end of the inclined sealing surface extends inclinedly towards the center line of the water-stopping element and the water inlet.

[0010] In a preferred embodiment, the water inlet includes a first water inlet section and a second water inlet section distributed sequentially along the water flow direction. The cross-sectional area of ​​the first water inlet section is larger than that of the second water inlet section. The cross-sectional area of ​​the second water inlet section gradually decreases along the water flow direction, forming a tapered structure.

[0011] In a preferred embodiment, the water-stopping element divides the inner cavity of the valve body into a back pressure chamber and a positive pressure chamber, and the back pressure chamber is connected to the water inlet through a pressure-boosting hole provided on the water-stopping element. The back pressure chamber is provided with a pressure relief channel, and the valve body is provided with a switching mechanism for controlling the opening and closing of the pressure relief channel. The water outlet is connected to the positive pressure chamber, and the water-stopping element controls whether the water inlet is connected to the positive pressure chamber.

[0012] In a preferred embodiment, the water-stopping element includes a diaphragm, a diaphragm seat, a connecting rod, and an end. The periphery of the diaphragm is confined to the side wall of the valve body. One end of the connecting rod passes sequentially through the middle of the diaphragm and the middle of the diaphragm seat, and is threadedly connected to the end to connect the diaphragm, diaphragm seat, and end together. The pressure-boosting hole or pressure-boosting channel is located on the connecting rod and passes through the end. The swirling structure is located on the end. The system also includes a return spring, which is located within the back pressure cavity and axially on the water-stopping element. The return spring abuts against the cavity surface corresponding to the diaphragm and the back pressure cavity. One end of the return spring that engages with the back pressure cavity forms a descaling rod axially toward the water-stopping element, and the descaling rod passes through the pressure-boosting hole. The switching mechanism is a mechanical switching device driven by a solenoid valve head motor.

[0013] This utility model also provides a valve assembly, including a flow regulating valve and a control valve as described above, wherein the outlet of the flow regulating valve is connected to the inlet of the control valve.

[0014] In a preferred embodiment, a filter screen is provided in the water passage connecting the outlet of the flow regulating valve and the inlet of the control valve; the filter screen is one, or the filter screen is multiple, the multiple filter screens are distributed along the water flow direction, and the mesh size of the multiple filter screens increases sequentially along the water flow direction.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. Because the first end of the water-stop component facing the water inlet of this utility model is provided with a vortex structure, the vortex structure guides the water flow to form a vortex area when the water-stop component controls the opening of the water inlet. The vortex fluid generated by the vortex area flushes the sealing mating surface between the water-stop component and the water inlet, thereby reducing the formation of scale on the sealing mating surface and reducing the probability of sediment remaining on the sealing mating surface. This greatly reduces the probability of the water-stop component failing due to scale deposition and sediment retention.

[0017] 2. As a preferred embodiment, the end face of the first end of the water-stop component protrudes into the inlet to form a guide protrusion, which can effectively guide the water flow and improve the circumferential flow effect, thereby better scouring the sealing mating surface between the water-stop component and the inlet in 360°. Furthermore, the radial dimension of the guide protrusion gradually decreases from the second end of the water-stop component towards the first end, so that the guide protrusion is conical or frustum-shaped, which can reduce the flow resistance of the water flow, disperse the impact force of the water flow on the guide protrusion, and make the water flow more evenly distributed around the guide protrusion.

[0018] 3. As a preferred embodiment, the vortex structure includes a plurality of spiral guide grooves disposed on the end face of the first end of the water stop and spaced apart along the circumferential direction of the water stop. The plurality of spiral guide grooves can guide the water flow to rotate in a specific direction, thereby forming a vortex more stably.

[0019] 4. The water-stop component has multiple sealing surfaces, which can achieve multiple seals when the water is closed. When some sealing surfaces fail due to mud or scale, the remaining sealing surfaces can continue to seal the water, thereby ensuring product quality, extending service life, and reducing the frequency of replacement and repair.

[0020] 4. The inlet includes a first inlet section and a second inlet section distributed sequentially along the water flow direction. The cross-sectional area of ​​the first inlet section is larger than that of the second inlet section. This causes the water flow to form a pressure difference at the inlet when the water stop is opened, thereby increasing the flow velocity and improving the water flow scouring force. This further improves the sealing surface between the water stop and the inlet, preventing scale deposition and sediment retention.

[0021] 5. The filter screen allows this invention to pre-intercept particles such as mud and sand in the water, reducing the amount of mud and sand entering the valve body's inlet with the water flow, thereby further reducing the probability of mud and sand causing the water-stopping parts to jam and fail.

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the control valve and valve assembly of the present invention are not limited to the embodiments. Attached Figure Description

[0023] Figure 1 This is an exploded view of the control valve of this utility model;

[0024] Figure 2 This is an exploded view of the water-stopping component of this utility model;

[0025] Figure 3 This is a three-dimensional structural diagram of the control valve of this utility model;

[0026] Figure 4 This is a bottom view of the control valve of this utility model;

[0027] Figure 5 This is a cross-sectional view of the control valve of this utility model;

[0028] Figure 6 yes Figure 5 An enlarged schematic diagram of part A in the middle;

[0029] Figure 7 This is a cross-sectional view of the valve assembly of this utility model;

[0030] In the diagram, 1. Valve body; 11. Upper shell; 111. Pressure relief channel; 12. Middle shell; 13. Lower shell; 131. Inlet; 132. Outlet; 133. First inlet section; 134. Second inlet section; 14. Sealing boss; 15. Positive pressure chamber; 16. Back pressure chamber; 2. Water stop component; 21. Diaphragm; 22. Connecting rod; 221. Pressure boosting hole; 23. Diaphragm seat; 231. End face sealing surface; 232. Inclined sealing surface; 24. End; 241. Flow guide protrusion; 242. Spiral flow guide groove; 3. Solenoid valve head; 4. Return spring; 41. Descaling rod; 5. Flow regulating valve; 51. Regulating rod; 6. First filter screen; 7. Second filter screen; 8. Inlet connector; 9. Outlet connector. Detailed Implementation

[0031] In this utility model, the terms "first," "second," etc., are used only to distinguish similar objects, not to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. The use of terms such as "upper," "lower," "inner," and "outer" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings, and is solely for the convenience of describing this utility model, not to indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, it should not be construed as a limitation on the scope of protection of this utility model. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0032] Furthermore, in the description of this utility model, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0033] Please see Figures 1-6 As shown, a control valve of this utility model includes a valve body 1 and a water-stopping element 2. The valve body 1 has an inlet 131 and an outlet 132. The water-stopping element 2 is used to control the opening or closing of the inlet 131. Specifically, the water-stopping element 2 is located inside the valve body 1 and opens the inlet 131 by moving it away from the inlet 131 along the axial direction of the inlet 131, and closes the inlet 131 by moving it away from the inlet 131. The end face of the water-stopping element 2 facing the inlet 131 is provided with a vortex structure. When the water-stopping element 2 controls the inlet 131 to open, the vortex structure guides the water flow to form a vortex area, and uses the vortex fluid generated by the vortex area to flush the sealing surface between the water-stopping element 2 and the inlet 131, thereby reducing the formation of scale on the sealing surface and reducing the probability of sediment remaining on the sealing surface.

[0034] As a preferred embodiment, such as Figure 5 , Figure 6As shown, the end face of the first end of the water-stopping member 2 protrudes into the inlet 131, forming a guide protrusion 241. This guide protrusion 241 is preferably coaxially arranged with the inlet 131, but is not limited to this; in other embodiments, the guide protrusion 241 and the inlet 131 are not coaxially arranged. There is a gap between the periphery of the guide protrusion 241 and the inner periphery of the inlet 131. The guide protrusion 241 can effectively guide the water flow, improving the circumferential flow effect, thereby better scouring the sealing mating surface of the water-stopping member 2 and the inlet 131 360°. Furthermore, the radial dimension of the guide protrusion 241 gradually decreases from the second end of the water-stopping member 2 towards the first end, so that the guide protrusion 241 is approximately conical or frustum-shaped. The first end and the second end of the water-stopping member 2 are the two axially opposite ends of the water-stopping member 2. This design of the guide protrusion 241 reduces the flow resistance of the water flow, disperses the impact force of the water flow on the guide protrusion 241, and makes the water flow more evenly distributed around the guide protrusion 241. In other embodiments, the end face of the first end of the water-stopping member 2 is flat.

[0035] like Figure 2 , Figure 4 As shown, the aforementioned vortex structure is provided on the guide protrusion 241. The vortex structure includes a plurality of spiral guide grooves 242 disposed on the end face (i.e., the surface of the guide protrusion 241) of the first end of the water-stopping member 2 and spaced apart along the circumferential direction of the water-stopping member 2. The plurality of spiral guide grooves 242 are arranged in the same spiral direction, and the first ends of the plurality of spiral guide grooves 242 are close to each other, and the first ends of the plurality of spiral guide grooves 242 are all close to the center of the first end of the water-stopping member 2. The second ends of the plurality of spiral guide grooves 242 all extend towards the edge of the first end of the water-stopping member 2. The spiral guide grooves 242 can guide the water flow to rotate in a specific direction, thereby forming a vortex more stably.

[0036] like Figure 5 , Figure 6 As shown, the valve body 1 has a sealing boss 14 at the inlet 131. The water-stopping component 2 has multiple sealing surfaces for contacting and engaging with the sealing boss 14 to achieve a seal. These multiple sealing surfaces are arranged sequentially from the outside to the inside along the radial direction of the water-stopping component 2. In this embodiment, the multiple sealing surfaces specifically include an end face sealing surface 231 and an inclined sealing surface 232. The end face sealing surface 231 is perpendicular to the axis of the water-stopping component 2. The first end of the inclined sealing surface 232 is connected to the inner edge of the end face sealing surface 231, and the second end of the inclined sealing surface 232 extends inclinedly towards the centerline of the water-stopping component 2 and the inlet 131. Therefore, the water-stopping component 2 can achieve a double seal in the water-off state. Furthermore, if one sealing surface fails due to mud or scale, the other sealing surface can continue to seal the water, thereby ensuring product quality, extending service life, and reducing the frequency of replacement.

[0037] like Figure 6As shown, the inlet 131 of the valve body 1 includes a first inlet section 133 and a second inlet section 134 distributed sequentially along the water flow direction. The cross-sectional area of ​​the first inlet section 133 is larger than that of the second inlet section 134. When the water stop 2 opens the inlet 131, a pressure difference is formed between the first inlet section 133 and the second inlet section 134 of the inlet 131, increasing the water flow velocity and thus improving the water flow scouring force. This further improves the sealing surface between the water stop 2 and the inlet 131, preventing scale deposition and sediment retention. The first inlet section 133 is a constant cross-section flow channel with a cylindrical inner wall to ensure a uniform flow velocity distribution in this section. The cross-sectional area of ​​the second inlet section 134 gradually decreases along the water flow direction; that is, the second inlet section 134 adopts a tapering flow channel design with a frustum-shaped inner wall to achieve a gradual transition of the water flow. This design can effectively optimize fluid dynamics performance, reduce flow resistance, and increase fluid velocity.

[0038] like Figure 5 As shown, the water-stopping element 2 divides the inner cavity of the valve body 1 into a back pressure chamber 16 and a positive pressure chamber 15. The back pressure chamber 16 is connected to the inlet 131 through a pressure-boosting hole 221 provided on the water-stopping element 2. The back pressure chamber 16 is provided with a pressure relief channel 111. The valve body 1 is provided with a switching mechanism for controlling the opening and closing of the pressure relief channel 111. This switching mechanism preferably uses an electromagnetic valve head 3 to achieve automated control, thus making this utility model an electromagnetic control valve, or simply an electromagnetic valve. In other embodiments, the switching mechanism can be replaced by a motor-driven mechanical switching device, which uses the motor to provide power to control the opening and closing of the pressure relief channel 111. The outlet 132 of the valve body 1 is kept in communication with the positive pressure chamber 15. The water-stopping element 2 controls whether the inlet 131 is connected to the positive pressure chamber 15, that is, the water-stopping element 2 controls the on / off state of the inlet 131 and the positive pressure chamber 15 by opening and closing the inlet 131.

[0039] like Figure 5As shown, the water-stopping component 2 includes a diaphragm 21, a diaphragm seat 23, a connecting rod 22, and an end 24. The four edges of the diaphragm 21 are confined to the side wall of the valve body 1. One end of the connecting rod 22 passes through the middle of the diaphragm 21 and the middle of the diaphragm seat 23 in sequence, and is threadedly connected to the end 24 to connect the diaphragm 21, the diaphragm seat 23, and the end 24 together. A pressure-boosting hole 221 or pressure-boosting channel is provided in the connecting rod 22 and passes through the end 24. The aforementioned end-face sealing surface 231 and inclined sealing surface 232 are provided in the diaphragm seat 23, and the aforementioned flow-guiding protrusion 241 and spiral flow-guiding groove 242 are provided in the end 24. This utility model also includes a return spring 4, which is disposed in the back pressure cavity 16 and located in the axial direction of the water stop 2. The return spring 4 is engaged with the diaphragm 21 and the cavity surface corresponding to the back pressure cavity 16. One end of the return spring 4 that engages with the back pressure cavity 16 extends axially toward the water stop 2 to form a descaling rod 41. The descaling rod 41 passes through the pressure boosting hole 221. When the water stop 2 performs the water switching action, the pressure boosting hole 221 moves synchronously with the water stop 2, so that the descaling rod 41 cleans the inner wall of the pressure boosting hole 221, thereby reducing the risk of the pressure boosting hole 221 being blocked by dirt.

[0040] like Figure 1 As shown, the valve body 1 is formed by sequentially sealing and connecting the upper shell 11, the middle shell 12, and the lower shell 13. The inlet 131 and the outlet 132 are located in the lower shell 13, and the pressure relief channel 111 is located in the upper shell 11.

[0041] The working principle of the control valve of this utility model is as follows:

[0042] When the water is turned on, the solenoid valve head 3 opens the pressure relief channel 111, allowing the water in the back pressure chamber 16 to be discharged through the pressure relief channel 111. This causes a sudden reduction in the water pressure on the water stop 2 on the back pressure chamber 16 side. Since the positive pressure chamber 15 side continues to maintain the water supply pressure, the water stop 2 is displaced in the direction of opening the water inlet 131 under the pressure difference between the positive pressure chamber 15 side and the back pressure chamber 16 side, and compresses the return spring 4. The two sealing surfaces of the water stop 2 separate from the sealing boss 14, thereby opening the water inlet 131. At the same time, the water flow impacts the guide protrusion 241 and generates a vortex-shaped water flow under the action of multiple spiral guide grooves 242, increasing the water flow scouring force and scouring the sealing mating surface of the water stop 2 and the inlet 131 (i.e., the two sealing surfaces of the water stop 2 and the sealing protrusion 14) 360°, reducing scale production and reducing the probability of silt remaining on the sealing mating surface, thereby greatly reducing the probability of the water stop 2 becoming stuck and failing due to scale deposition and silt retention.

[0043] When the water is turned off, the solenoid valve head 3 closes the pressure relief channel 111, and the water flow gradually replenishes the back pressure chamber 16 through the pressure boosting hole 221, so that the water pressure on the back pressure chamber 16 side of the water stop 2 gradually increases, and under the combined action of the restoring force of the return spring 4, it gradually moves in the direction of turning off the water until the water inlet 131 is closed.

[0044] Please see Figures 1-7 As shown, a valve assembly of the present invention includes a flow regulating valve 5 and the control valve described above. The outlet of the flow regulating valve 5 is connected to the inlet 131 of the control valve.

[0045] As a preferred embodiment, a filter screen is installed in the water passage connecting the outlet of the flow regulating valve 5 and the inlet 131 of the control valve. The filter screen is used to pre-intercept particles such as mud and sand in the water, reducing the amount of mud and sand that enter the inlet 131 of the control valve with the water flow, thereby further reducing the probability of mud and sand causing the water stop 2 to jam and fail.

[0046] Furthermore, multiple filter screens are provided, distributed along the water flow direction, and the mesh size of the multiple filter screens increases sequentially along the water flow direction. In this embodiment, two filter screens are used as an example, but it is not limited to this. These two filter screens are an 80-mesh first filter screen 6 and a 120-mesh second filter screen 7.

[0047] During operation, water enters from the inlet connector 8 of the valve assembly, passes through the regulating rod 51 of the flow regulating valve 5, and then passes through the first filter screen 6 for initial screening of impurities and silt. It then flows to the second filter screen 8, where it undergoes fine screening before flowing into the inlet 131 of the control valve, and finally flows out from the outlet connector 9 of the valve assembly.

[0048] The control valve and valve assembly of this utility model are identical to or can be implemented using existing technologies for the parts not covered (such as the structure and working principle of the solenoid valve head 3).

[0049] The above embodiments are only used to further illustrate a control valve and valve assembly of the present invention, but the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A control valve, comprising a valve body and a water-stopping element, wherein the valve body is provided with an inlet and an outlet, and the water-stopping element is used to control the opening or closing of the inlet; characterized in that: The first end of the water-stop component facing the water inlet is provided with a vortex structure. When the water-stop component controls the water inlet to open, the vortex structure guides the water flow to form a vortex region, and uses the vortex fluid generated by the vortex region to flush the sealing mating surface between the water-stop component and the water inlet.

2. The control valve according to claim 1, characterized in that: The first end of the water-stopping component protrudes into the inlet to form a flow-guiding protrusion. There is a gap between the periphery of the flow-guiding protrusion and the periphery of the inner wall of the inlet. The swirling structure is provided on the flow-guiding protrusion.

3. The control valve according to claim 2, characterized in that: The radial dimension of the guide protrusion gradually decreases from the second end to the first end of the waterstop, so that the guide protrusion is conical or frustum-shaped; the first end and the second end of the waterstop are the two opposite ends of the waterstop in the axial direction.

4. The control valve according to any one of claims 1-3, characterized in that: The swirling structure includes a plurality of spiral guide grooves disposed on the first end face of the waterstop and spaced apart along the circumferential direction of the waterstop. The plurality of spiral guide grooves are arranged in the same spiral direction, and the first ends of the plurality of spiral guide grooves are close to each other, and the second ends of the plurality of spiral guide grooves all extend toward the first end edge of the waterstop.

5. The control valve according to claim 1, characterized in that: The valve body has a sealing boss at the inlet, and the water stop has multiple sealing surfaces for contacting and engaging with the sealing boss to achieve a seal. The multiple sealing surfaces are arranged sequentially from the outside to the inside along the radial direction of the water stop.

6. The control valve according to claim 5, characterized in that: The multiple sealing surfaces include an end face sealing surface and an inclined sealing surface. The end face sealing surface is perpendicular to the axis of the water-stopping element. The first end of the inclined sealing surface is connected to the inner edge of the end face sealing surface, and the second end of the inclined sealing surface extends inclinedly towards the center line of the water-stopping element and the water inlet.

7. The control valve according to claim 1, characterized in that: The inlet includes a first inlet section and a second inlet section distributed sequentially along the water flow direction. The cross-sectional area of ​​the first inlet section is larger than that of the second inlet section. The cross-sectional area of ​​the second inlet section gradually decreases along the water flow direction, forming a tapered structure.

8. The control valve according to claim 1, characterized in that: The water-stopping component divides the inner cavity of the valve body into a back pressure chamber and a positive pressure chamber. The back pressure chamber is connected to the inlet through a pressure-boosting hole provided on the water-stopping component. The back pressure chamber is provided with a pressure relief channel. The valve body is provided with a switching mechanism for controlling the opening and closing of the pressure relief channel. The outlet is connected to the positive pressure chamber. The water-stopping component controls whether the inlet is connected to the positive pressure chamber.

9. The control valve according to claim 8, characterized in that: The water-stopping component includes a diaphragm, a diaphragm seat, a connecting rod, and an end. The four edges of the diaphragm are confined to the side wall of the valve body. One end of the connecting rod passes sequentially through the middle of the diaphragm and the middle of the diaphragm seat, and is threadedly connected to the end to connect the diaphragm, diaphragm seat, and end together. The pressure-boosting hole or pressure-boosting channel is located in the connecting rod and passes through the end. The swirling structure is located in the end. A return spring is also included, which is located in the back pressure cavity and axially on the water-stopping component. The return spring abuts against the cavity surface corresponding to the diaphragm and the back pressure cavity. One end of the return spring that mates with the back pressure cavity forms a descaling rod axially toward the water-stopping component, and the descaling rod passes through the pressure-boosting hole. The switching mechanism is a solenoid valve head or a motor-driven mechanical switching device.

10. A valve assembly comprising a flow regulating valve, characterized in that: It also includes a control valve as described in any one of claims 1-9, wherein the outlet of the flow regulating valve is connected to the inlet of the control valve; A filter screen is installed on the water passage connecting the outlet of the flow regulating valve and the inlet of the control valve; the filter screen is one, or the filter screen is multiple, the multiple filter screens are distributed along the water flow direction, and the mesh size of the multiple filter screens increases sequentially along the water flow direction.

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