A pressure-limiting valve system for controlling the size of a water flow

Abstract

The application discloses a pressure-limiting valve system for controlling water flow, and belongs to the field of flow-limiting valves. The system solves the problem that the existing pressure-limiting valve cannot realize the regulation and on-off control of water flow. The technical solution mainly comprises a valve body and a valve core. The valve body is internally provided with a valve cavity. The valve cavity is internally provided with a pipe body fixedly connected with the valve body. The pipe body is internally provided with a pipe body cavity for mounting the valve core. The valve core is in sliding connection with the pipe body cavity. The valve core is internally provided with a valve hole. The outer side of one end of the valve core facing a water inlet is provided with a plug for cooperating with the valve hole. The valve core and the pipe body are provided with an elastic reset member. The valve core has a tendency to keep away from the plug by the elastic action of the elastic reset member. The water flow of a water outlet is determined by the opening degree between the valve core and the plug. The valve body is provided with a switch knob for driving the valve core to move relative to the plug to adjust the opening degree. The application is mainly used for realizing the regulation and on-off control of the pressure-limiting valve.

Description

Technical Field

[0001] This invention relates to flow control valves, and more particularly to a pressure limiting valve system for controlling the amount of water flow. Background Technology

[0002] To ensure stable water output, existing water supply systems typically include pressure limiting valves. For example, utility model patent CN208997407U discloses a water supply system and a pressure limiting valve. The system includes a valve body with an inlet and an outlet, and a first through-hole inside the valve body. A guide pipe and a piston are also included. The guide pipe is installed inside the first through-hole, with one end connected to the inlet. The piston is slidably installed inside the first through-hole, close to the outlet. One end of the guide pipe and one end of the piston are spaced apart and have a receiving hole on the piston, into which the guide pipe can extend. A tensioning element is fitted around the guide pipe and engages with the piston. Because the flow rate and timing of water supply are often adjusted according to actual needs during daily water supply, the pressure limiting valve in the above-mentioned device requires the assistance of other valves to control the water flow and the opening and closing of the pressure limiting valve. Summary of the Invention

[0003] The purpose of this invention is to provide a pressure limiting valve system for controlling water flow, which solves the problem that existing pressure limiting valves cannot adjust water flow and control the opening and closing of the limit valve, thus enabling the pressure limiting valve to adjust water flow and control the opening and closing of the pressure limiting valve.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a pressure limiting valve system for controlling water flow, comprising a valve body and a valve core, wherein the valve body has a valve cavity inside, and an inlet and an outlet connected to the valve cavity are opened on the valve body. A pipe body fixedly connected to the valve body is provided inside the valve cavity, and a pipe body cavity for installing the valve core is provided inside the pipe body. The valve core and the pipe body cavity are slidably connected. A valve hole is provided inside the valve core. A plug for cooperating with the valve hole is provided on the outer side of the end of the valve core facing the inlet. An elastic reset member is provided between the valve core and the pipe body. The valve core tends to stay away from the plug due to the elastic action of the elastic reset member. The water flow rate at the outlet is determined by the opening degree between the valve core and the plug. A switch knob is provided on the valve body for driving the valve core to move relative to the plug to adjust the opening degree.

[0005] After adopting the above technical solution, the present invention has the following advantages: First, through the sliding connection between the valve core and the pipe body cavity, a plug for cooperating with the valve hole is provided on the outer side of the end of the valve core facing the water inlet. The valve core and the pipe body are connected by an elastic reset member. The valve core can move adaptively by the combined action of the water pressure in the valve cavity and the elasticity of the elastic reset member, adjusting the opening between the valve core and the plug to achieve the pressure limiting function. Second, a switch knob is provided. The valve core moves by the combined action of the switch knob and the elasticity of the elastic reset member, realizing the manual adjustment of the opening between the valve core and the plug, realizing the adjustment of the water flow rate and the opening and closing of the pressure limiting valve. The functions are diversified, no additional valve is required for control, the structure is simpler, and the installation is more convenient.

[0006] Furthermore, the valve core has a minimum opening position (minimum opening) and a maximum opening position (maximum opening), with the switch knob switching the valve core between these two positions. Using the aforementioned technical solution, the valve core has a minimum opening position (minimum opening) to minimize the valve orifice opening, satisfying small-flow water supply, and a maximum opening position (maximum opening) to maximize the valve orifice opening, satisfying large-flow water supply. Simultaneously, the switch knob switches the valve core between the minimum and maximum opening positions, achieving water flow regulation. Depending on actual needs, the minimum opening position can also be a closed valve orifice state.

[0007] Furthermore, the switch knob is perpendicular to the valve body, pipe body, or valve core. The valve body has a mounting through hole, the pipe body has a limiting hole communicating with the mounting through hole, and the surface of the valve core has a first retaining ring. The lower part of the switch knob has an elliptical structure. After the switch knob passes through the mounting through hole and the limiting hole in sequence, the elliptical structure of the switch knob contacts and engages with the first retaining ring. The rotation of the switch knob drives the elliptical structure to rotate, and the rotation of the elliptical structure drives the valve core to move axially. Using the aforementioned technical solution, due to the different radial diameters of the elliptical structure and the limiting hole's effect on the axial movement of the switch knob, rotating the switch knob allows different diameter portions of the elliptical structure to contact the valve core, driving the valve core to move axially, thereby adjusting the opening between the valve core and the plug, and achieving water flow regulation. This method is convenient to use and has a simple structure.

[0008] Furthermore, the switch knob extends downwards into a protruding arm, with a first limiting protrusion at the bottom end of the protruding arm and a second limiting protrusion inside the mounting through hole. The first limiting protrusion and the second limiting protrusion engage to keep the valve core in the minimum opening position. The protruding arm can deform around the lower part of the switch knob under external force. Alternatively, the switch knob extends downwards into a protruding arm, with a limiting rib at the bottom end of the protruding arm and a limiting groove inside the mounting through hole. The limiting rib and the limiting groove engage to keep the valve core in the minimum opening position. The protruding arm can deform around the lower part of the switch knob under external force. Using the aforementioned technical solutions, in one embodiment, by setting a first limiting protrusion and a second limiting protrusion, a structurally stable switch knob can be formed, effectively preventing the switch knob from loosening, keeping the valve core at the minimum opening position, increasing the reliability of the pressure relief valve when closed, and allowing the protruding arm to deform around the lower part of the switch knob under external force. When the user uses it, a certain torque is applied to rotate the switch knob, the first limiting protrusion disengages from the limit of the second limiting protrusion, the limit valve is opened, and the water flow rate is adjusted. The structure with the first and second limiting protrusions is relatively simple and easy to manufacture. Alternatively, in another embodiment, by setting a limiting rib and a limiting groove, a structurally stable switch knob can be formed, effectively preventing the switch knob from loosening, keeping the valve core at the minimum opening position, increasing the reliability of the pressure relief valve when closed, and allowing the protruding arm to deform around the lower part of the switch knob under external force. When the user uses it, a certain torque is applied to rotate the switch knob, the limiting rib disengages from the limit of the limiting groove, the limit valve is opened, and the water flow rate is adjusted.

[0009] Furthermore, the plug is threaded to the pipe body, and the end face of the plug facing the valve hole is a conical surface. A first sealing ring is provided on the surface of the plug. When the valve core is in its minimum opening position, the plug seals the valve hole through the conical surface and the first sealing ring. Alternatively, the plug is threaded to the valve body, and the end face of the plug facing the valve hole is a conical surface. A first sealing ring is provided on the surface of the plug. When the valve core is in its minimum opening position, the plug seals the valve hole through the conical surface and the first sealing ring. Using the aforementioned technical solutions, in one solution, the conical surface abuts against the inner wall of the valve hole, and the first sealing ring abuts against the inner wall of the valve hole, forming a double sealing effect, increasing the sealing effect when the valve core is in its minimum opening position. Alternatively, in another solution, the plug can also be threaded to the valve body to achieve a reliable connection, and the conical surface abuts against the inner wall of the valve hole, and the first sealing ring abuts against the inner wall of the valve hole, forming a double sealing effect, increasing the sealing effect when the valve core is in its minimum opening position.

[0010] Furthermore, a second retaining ring is provided on the surface of the valve core. When the valve core is in the minimum opening position, the elliptical structure of the switch knob abuts against the second retaining ring. By adopting the aforementioned technical solution, the second retaining ring ensures that the elliptical structure of the switch knob abuts against it when the valve core is in the minimum opening position, further preventing the switch knob from becoming loose and increasing the reliability of the limit valve when closed. Additionally, the elliptical structure of the switch knob can also limit the second retaining ring, restricting the lateral movement of the valve core and effectively preventing the valve core from continuously impacting the plug under water pressure, thus ensuring the service life of the plug and guaranteeing the sealing effect when the valve core is in the minimum opening position.

[0011] Furthermore, the pipe body is interference-fitted with the valve cavity, and a second sealing ring is provided between the end of the pipe body near the inlet and the inner wall of the valve cavity. By employing the aforementioned technical solution, the interference fit and the second sealing ring achieve a double sealing effect, effectively preventing water from flowing through the gap between the pipe body and the valve cavity, thus ensuring the accuracy of water flow control in the pressure relief valve system.

[0012] Furthermore, the pipe body near the outlet is provided with a pressure regulating ring to prevent water from entering the pipe body cavity through the valve hole. A first positioning groove is provided between the pipe body near the outlet and the valve body, and a second positioning groove is provided on the surface of the valve core. One end of the pressure regulating ring is embedded in the first positioning groove, and the other end is embedded in the second positioning groove. By adopting the aforementioned technical solution, the pressure regulating ring is used to, on the one hand, move the valve core by being pushed by water pressure, thereby achieving a pressure limiting effect; on the other hand, it effectively prevents water from entering the pipe body cavity through the valve hole, facilitating the discharge of water from the valve hole from the outlet. The first and second positioning grooves also increase the installation reliability of the pressure regulating ring, thus ensuring a sealing effect.

[0013] Furthermore, the pressure at the outlet increases and overcomes the elastic force of the resilient reset element, causing the valve core to move away from its maximum opening position. By employing the aforementioned technical solution, the pressure at the outlet increases and overcomes the elastic force of the resilient reset element, thereby automatically adjusting the opening between the valve core and the plug, thus achieving the pressure limiting function.

[0014] Furthermore, the valve body includes an inlet connector and an outlet connector, which are threaded together to form the valve body. The aforementioned technical solution results in a simple structure and facilitates assembly. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings:

[0016] Figure 1 This is a schematic diagram of the pressure limiting valve system for controlling water flow in the present invention (with the valve orifice at its minimum opening).

[0017] Figure 2This is a schematic diagram of the pressure limiting valve system for controlling water flow in the present invention (with the valve orifice at its maximum opening).

[0018] Figure 3 This is an exploded view of the pressure relief valve in this invention;

[0019] Figure 4 This is a schematic diagram of the switch knob in this invention;

[0020] Figure 5 This is a cross-sectional view of the switch knob in this invention;

[0021] In the diagram, 1. Valve body; 11. Valve cavity; 12. Inlet; 13. Outlet; 14. Mounting through hole; 15. Inlet connector; 16. Outlet connector; 2. Valve core; 21. Valve hole; 22. First retaining ring; 23. Second retaining ring; 24. Second positioning groove; 3. Pipe body; 31. Pipe body cavity; 32. Limiting hole; 33. First positioning groove; 4. Plug; 41. Conical surface; 5. Switch knob; 51. Elliptical structure; 52. Protruding arm; 53. First limiting protrusion; 61. First sealing ring; 62. Second sealing ring; 63. Pressure regulating retaining ring; 64. Third sealing ring; 7. Elastic reset component. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0023] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented in sequences other than those illustrated or described herein.

[0024] It should be understood that in the various embodiments of the present invention, the number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0025] It should be understood that in this invention, "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0026] It should be understood that in this invention, "multiple" refers to two or more. "And / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, X and / or Y can represent: X alone, X and Y simultaneously, or Y alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "Contains X, Y, and Z", "Contains X, Y, and Z" means that all three X, Y, and Z are contained; "Contains X, Y, or Z" means that one of X, Y, and Z is contained; "Contains X, Y, and / or Z" means that any one, two, or three of X, Y, and Z are contained.

[0027] The technical solution of the present invention will be described in detail below with reference to specific embodiments. The following specific embodiments may be combined or substituted with each other according to the actual situation, and the same or similar concepts or processes may not be described again in some embodiments.

[0028] like Figures 1 to 5 As shown, the present invention provides a pressure limiting valve system for controlling water flow, including a valve body 1 and a valve core 2. The valve body 1 has a valve cavity 11 inside, and an inlet 12 and an outlet 13 connected to the valve cavity 11. The valve cavity 11 has a pipe body 3 fixedly connected to the valve body 1. The pipe body 3 has a pipe cavity 31 for installing the valve core 2. The valve core 2 is slidably connected to the pipe cavity 31. The valve core 2 has a valve hole 21 inside. A plug 4 for cooperating with the valve hole 21 is provided on the outer side of the end of the valve core 2 facing the inlet 12. An elastic reset member 7 is provided between the valve core 2 and the pipe body 3. The valve core 2 tends to stay away from the plug 4 due to the elastic action of the elastic reset member 7. The water flow rate at the outlet 13 is determined by the opening between the valve core 2 and the plug 4. The valve body 1 has a switch knob 5 for driving the valve core 2 to move relative to the plug 4 to adjust the opening.

[0029] First, the valve core 2 is slidably connected to the pipe cavity 31. A plug 4 for cooperating with the valve hole 21 is provided on the outer side of the end of the valve core 2 facing the water inlet 12. The valve core 2 and the pipe 3 are connected by an elastic reset member 7. The valve core 2 can move adaptively by the combined action of the water pressure in the valve cavity 11 and the elasticity of the elastic reset member 7, adjusting the opening between the valve core 2 and the plug 4 to achieve the pressure limiting function. Second, a switch knob 5 is provided. The valve core 2 moves by the combined action of the switch knob 5 and the elasticity of the elastic reset member 7, realizing the manual adjustment of the opening between the valve core 2 and the plug 5, realizing the adjustment of the water flow rate and the opening and closing of the pressure limiting valve. The functions are diversified, no additional valve is required for control, the structure is simpler, and the installation is more convenient.

[0030] like Figure 2As shown, when the pressure relief valve is opened by adjusting the switch knob 5, when the water pressure on the outlet 13 side is greater than the water pressure on the inlet 12 side, the valve core 2 moves from right to left under the action of water pressure, which reduces the opening between the valve core 2 and the plug 4; when the water pressure on the outlet 13 side is less than the water pressure on the inlet 12 side, the valve core 2 moves from left to right under the action of water pressure, which increases the opening between the valve core 2 and the plug 4.

[0031] In this invention, the valve body 1 includes an inlet connector 15 and an outlet connector 16, which are threaded together to form the valve body 1. The structure is simple and easy to assemble.

[0032] To further regulate the flow rate, the valve core 2 has a minimum opening position (minimum opening) and a maximum opening position (maximum opening). The switch knob 5 switches the valve core 2 between these two positions. Through this device, the valve core 2 can be positioned at its minimum opening (minimum opening) to accommodate small flow rates, and at its maximum opening (maximum opening) to accommodate large flow rates. Simultaneously, the switch knob 5 switches the valve core 2 between these two positions, thus regulating the water flow rate. Depending on actual needs, the minimum opening position can also be a closed state for the valve orifice 21.

[0033] Specifically, the switch knob 5 is perpendicular to the valve body 1. The valve body 1 has a mounting through hole 14, and the pipe body 3 has a limiting hole 32 communicating with the mounting through hole 14. The surface of the valve core 2 has a first retaining ring 22. The lower part of the switch knob 5 has an elliptical structure 51. After the switch knob 5 passes through the mounting through hole 14 and the limiting hole 32 in sequence, the elliptical structure 51 of the switch knob 5 contacts and engages with the first retaining ring 22. The rotation of the switch knob 5 drives the elliptical structure to rotate, and the rotation of the elliptical structure drives the valve core 2 to move axially. Because the radial diameter of the elliptical structure 51 is different, and the limiting hole 32 limits the axial movement of the switch knob 5, by rotating the switch knob 5, different diameter parts of the elliptical structure 51 contact the valve core 2, driving the valve core 2 to move axially, thereby adjusting the opening of the valve orifice 21 and realizing the regulation of water flow. It is relatively convenient to use and has a relatively simple structure.

[0034] Understandably, the switch knob 5 can also be set perpendicular to the pipe body 3, or it can also be set perpendicular to the valve core 2.

[0035] It should be noted that in this invention, the switch knob 5 can be rotated 90°. By rotating the switch knob 5, the elliptical structure 51 is rotated from the end with the larger diameter to the end with the smaller diameter, which abuts against the first retaining ring 22. The opening of the valve hole 21 increases from small to large, and the water flow increases from small to large. By rotating the switch knob 5 in the opposite direction, the water flow decreases from large to small until it is closed.

[0036] It should be noted that one end of the elastic reset member 7 abuts against the first retaining ring 22, and the other end abuts against the tube body 3.

[0037] It should be noted that a third sealing ring 64 is provided between the valve body 1 and the pipe body 3 at one end of the inlet 12 to further improve the sealing effect and increase the accuracy of flow regulation.

[0038] To position the switch knob 5, in one embodiment, the switch knob 5 extends downwards with a protruding arm 52. The bottom end of the protruding arm 52 has a first limiting protrusion 53, and the mounting through hole 14 has a second limiting protrusion. The first limiting protrusion 53 and the second limiting protrusion engage to keep the valve core 2 in the minimum opening position. The protruding arm 52 can deform around the lower part of the switch knob 5 under external force. By setting the first limiting protrusion 53 and the second limiting protrusion, a structurally stable switch knob 5 can be formed, effectively preventing the switch knob 5 from loosening, keeping the valve core 2 in the minimum opening position, increasing the reliability of the pressure relief valve when closed, and allowing the protruding arm 52 to deform around the lower part of the switch knob 5 under external force. When the user uses it, a certain torque is applied to rotate the switch knob 5, causing the first limiting protrusion 53 to disengage from the second limiting protrusion, opening the limiting valve and adjusting the water flow rate. The structure of setting the first limiting protrusion 53 and the second limiting protrusion is relatively simple and easy to manufacture.

[0039] It should be noted that when the protruding arm 52 is deformed around the lower part of the switch knob 5 by an external force, the protruding arm 52 may move radially toward the switch knob 5. However, it is not limited to this.

[0040] In another embodiment, the switch knob 5 extends downward into a protruding arm 52. The bottom end of the protruding arm 52 is provided with a limiting rib, and a limiting groove is provided within the mounting through hole 14. The limiting rib and the limiting groove cooperate to keep the valve core 2 in the minimum opening position. The protruding arm 52 can deform around the lower part of the switch knob 5 under external force. By setting the limiting rib and the limiting groove, a structurally stable switch knob 5 can be formed, effectively preventing the switch knob 5 from loosening, keeping the valve core 2 in the minimum opening position, increasing the reliability of the pressure relief valve when closed, and allowing the protruding arm 52 to deform around the lower part of the switch knob 5 under external force. When the user uses the switch knob 5, a certain torque is applied to rotate it, causing the limiting rib to disengage from the limiting groove, opening the limiting valve and adjusting the water flow rate.

[0041] Furthermore, a second retaining ring 23 is provided on the surface of the valve core 2. When the valve core 2 is in the minimum opening position, the elliptical structure 51 of the switch knob 5 abuts against the second retaining ring 23. By adopting the aforementioned technical solution, by setting the second retaining ring 23, when the valve core 2 is in the minimum opening position, the elliptical structure 51 of the switch knob 5 abuts against the second retaining ring 23, further preventing the switch knob 5 from loosening, further increasing the performance reliability of the limit valve when closed. In addition, the elliptical structure 51 of the switch knob 5 can also limit the second retaining ring 23, restricting the lateral movement of the valve core 2, effectively preventing the valve core 2 from being continuously impacted by the pressure of the water flow, effectively ensuring the service life of the plug 4, thereby ensuring the sealing effect when the valve core 2 is in the minimum opening position.

[0042] To enhance the sealing effect when the valve core 2 is in its minimum opening position, in one embodiment, the plug 4 is threadedly connected to the pipe body 3. The end face of the plug 4 facing the valve hole 21 is a conical surface 41, and a first sealing ring 61 is provided on the surface of the plug 4. When the valve core 2 is in its minimum opening position, the plug 4 seals the valve hole 21 through the conical surface 41 and the first sealing ring 61. The abutment between the conical surface 41 and the inner wall of the valve hole 21, as well as the abutment between the first sealing ring 61 and the inner wall of the valve hole 21, creates a double sealing effect, thus enhancing the sealing effect when the valve core 2 is in its minimum opening position.

[0043] In another embodiment, the plug 4 is threaded to the valve body 1 to achieve a reliable connection. The end face of the plug 4 facing the valve hole 21 is a conical surface. The surface of the plug 4 is provided with a first sealing ring 61. When the valve core 2 is in the minimum opening position, the plug 4 seals the valve hole 21 through the conical surface and the first sealing ring 61.

[0044] To ensure the reliability of the pressure relief valve, the pipe body 3 is interference-fitted with the valve cavity 11, and a second sealing ring 62 is provided between the end of the pipe body 3 near the inlet 12 and the inner wall of the valve cavity 11. The interference fit and the second sealing ring 62 provide a double sealing effect, effectively preventing water from flowing through the gap between the pipe body 3 and the valve cavity 11, thus ensuring the accuracy of water flow control in the pressure relief valve system.

[0045] Furthermore, a pressure regulating baffle ring 63 is provided at one end of the pipe body 3 near the outlet 13 to prevent water from entering the pipe body cavity 31 through the valve hole 21. A first positioning groove 33 is provided between the end of the pipe body 3 near the outlet 13 and the valve body 1, and a second positioning groove 24 is provided on the surface of the valve core 2. One end of the pressure regulating baffle ring 63 is embedded in the first positioning groove 33, and the other end is embedded in the second positioning groove 24. By adopting the aforementioned technical solution, by setting the pressure regulating baffle ring 63, on the one hand, the valve core 2 is moved by the water pressure pushing the pressure regulating baffle ring 63, thereby achieving a pressure limiting effect. On the other hand, it effectively prevents water from entering the pipe body cavity 31 through the valve hole 21, which is conducive to the water from the valve hole 21 being discharged from the outlet 13. In addition, the setting of the first positioning groove 33 and the second positioning groove 24 increases the installation reliability of the pressure regulating baffle ring 63, thereby ensuring the sealing effect.

[0046] Furthermore, the pressure at the outlet 13 increases and overcomes the elastic force of the elastic reset member 7, causing the valve core 2 to move away from its maximum opening position. By increasing the pressure at the outlet 13 and overcoming the elastic force of the elastic reset member 7, the opening between the valve core 2 and the plug 4 is automatically adjusted, thereby achieving the pressure limiting function.

[0047] It should be noted that when the water pressure is too high and exceeds a certain value, the left and right pressures of the pressure regulating ring 63 become unbalanced. The water pressure pushes the pressure regulating ring 63 and the valve core 2 to move, reducing the opening, flow rate, and water pressure, until the elastic force of the elastic reset element 7 and the water pressure are balanced, thereby achieving the pressure limiting effect.

[0048] It should be noted that in this invention, the elastic reset member 7 can be a suitable structure such as a spring or torsion spring.

[0049] In addition to the preferred embodiments described above, the present invention has other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection claimed by the present invention.

Claims

1. A pressure-limiting valve system for controlling water flow, comprising a valve body and a valve core, characterized in that, The valve body has an internal valve cavity with an inlet and an outlet connected to it. A pipe fixedly connected to the valve body is located within the valve cavity, and the pipe contains a cavity for mounting the valve core. The valve core is slidably connected to the cavity. The valve core has an internal valve hole, and a plug for engaging with the valve hole is located on the outer side of the valve core facing the inlet. An elastic reset element is positioned between the valve core and the pipe. The elasticity of this reset element causes the valve core to tend to stay away from the plug. The water flow rate at the outlet is determined by the opening between the valve core and the plug. The valve body is provided with a switch knob for moving the valve core relative to the plug to adjust the opening. The switch knob is set perpendicularly to the valve body, the pipe body or the valve core. The valve body is provided with a mounting through hole, and the pipe body is provided with a limiting hole communicating with the mounting through hole. The surface of the valve core is provided with a first retaining ring. The lower part of the switch knob has an elliptical structure. After the switch knob passes through the mounting through hole and the limiting hole in sequence, the elliptical structure of the switch knob contacts and engages with the first retaining ring. The rotation of the switch knob drives the elliptical structure to rotate, and the rotation of the elliptical structure drives the valve core to move axially.

2. The pressure limiting valve system for controlling water flow according to claim 1, characterized in that, The valve core has a minimum opening position that puts the valve orifice in the minimum opening state and a maximum opening position that puts the valve orifice in the maximum opening state. The switch knob drives the valve core to switch between the minimum opening position and the maximum opening position.

3. The pressure limiting valve system for controlling water flow according to claim 2, characterized in that, The switch knob extends downwards into a protruding arm. The bottom end of the protruding arm has a first limiting protrusion, and the mounting through hole has a second limiting protrusion. The first limiting protrusion and the second limiting protrusion contact and cooperate to keep the valve core in the minimum opening position. The protruding arm can deform around the lower part of the switch knob under external force. Alternatively, the switch knob extends downwards into a protruding arm. The bottom end of the protruding arm has a limiting rib, and the mounting through hole has a limiting groove. The limiting rib and the limiting groove cooperate to keep the valve core in the minimum opening position. The protruding arm can deform around the lower part of the switch knob under external force.

4. The pressure limiting valve system for controlling water flow according to claim 3, characterized in that, The plug is threaded to the pipe body, and the end face of the plug facing the valve hole is a conical surface. The surface of the plug is provided with a first sealing ring. When the valve core is in the minimum opening position, the plug seals the valve hole through the conical surface and the first sealing ring. Alternatively, the plug is threaded to the valve body, and the end face of the plug facing the valve hole is a conical surface. The surface of the plug is provided with a first sealing ring. When the valve core is in the minimum opening position, the plug seals the valve hole through the conical surface and the first sealing ring.

5. The pressure limiting valve system for controlling water flow according to claim 3, characterized in that, The valve core is provided with a second retaining ring on its surface. When the valve core is in the minimum opening position, the elliptical structure of the switch knob abuts against the second retaining ring.

6. The pressure limiting valve system for controlling water flow according to claim 1, characterized in that, The pipe body is interference-fitted with the valve cavity, and a second sealing ring is provided between the end of the pipe body near the water inlet and the inner wall of the valve cavity.

7. The pressure limiting valve system for controlling water flow according to claim 6, characterized in that, The pipe body is provided with a pressure regulating baffle ring at one end near the outlet to prevent water from entering the pipe body cavity through the valve hole. A first positioning groove is provided between the pipe body and the valve body at one end near the outlet. A second positioning groove is provided on the surface of the valve core. One end of the pressure regulating baffle ring is embedded in the first positioning groove, and the other end is embedded in the second positioning groove.

8. The pressure-limiting valve system for controlling water flow according to any one of claims 1 to 7, characterized in that, The pressure at the outlet increases and overcomes the elastic force of the elastic reset element, causing the valve core to move away from the maximum opening position.

9. The pressure limiting valve system for controlling water flow according to claim 1, characterized in that, The valve body includes an inlet connector and an outlet connector, which are threaded together to form the valve body.

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