Backflow prevention flow regulating valve with leakage protection

Abstract

This invention relates to the field of valve body technology; it proposes an anti-backflow flow regulating valve with leakage protection, comprising a main valve body, a main valve diaphragm, and a valve core assembly. The main valve body includes a valve cavity with an inlet end and an outlet end. The main valve diaphragm divides the valve cavity into a control cavity and a flow passage cavity. It also includes a check valve core. The valve core assembly and the check valve core are located within the flow passage cavity, with an intermediate cavity between them. The valve core assembly is connected to the main valve diaphragm. The main valve diaphragm deforms to control the opening or closing of the valve core assembly. The check valve core opens unidirectionally from the inlet end to the outlet end. The valve also includes an anti-backflow reversing valve, a flow pilot valve, a flow detection probe, and a leakage protection valve. The flow detection probe is located at the inlet end and connected to the flow pilot valve. The inlet end, the anti-backflow reversing valve, the control cavity, the flow pilot valve, and the outlet end are sequentially connected to keep the regulating valve in a dynamic flow regulation state. This solves the problem of maintaining the reliability of anti-backflow in existing flow regulating valves over a long period.

Description

Technical Field

[0001] This invention relates to the field of valve body technology, and more specifically, to an anti-backflow flow regulating valve with leakage protection. Background Technology

[0002] The flow valve is adjustable, and the flow rate can be set according to design or actual requirements. It can automatically eliminate system pressure fluctuations and maintain a constant flow rate.

[0003] Despite significant advancements in flow control valve technology, several challenges remain in practical applications. For instance, traditional flow control valves continue to supply water even when responding to downstream emergency leaks, leading to water waste. Furthermore, they lack reliable backflow prevention mechanisms when downstream pressure rises, especially in cases of potential downstream contamination. While some valves incorporate emergency shut-off features, their reliability diminishes with use due to deteriorating sealing. Therefore, a valve body capable of addressing these issues is urgently needed. Summary of the Invention

[0004] This invention proposes an anti-backflow flow regulating valve with leakage protection, which solves the problem that the reliability of anti-backflow in existing flow regulating valves is difficult to maintain for a long time.

[0005] The technical solution of the present invention is as follows:

[0006] A backflow prevention flow regulating valve with leakage protection is disclosed. The flow regulating valve includes a main valve body, a main valve diaphragm, and a valve core assembly. The main valve body includes a valve cavity with an inlet end and an outlet end. The main valve diaphragm is disposed within the valve cavity and divides the valve cavity into a control cavity and a flow passage cavity. The flow regulating valve also includes a check valve core. The valve core assembly and the check valve core are sequentially disposed within the flow passage cavity, with an intermediate cavity between them. The valve core assembly is connected to the main valve diaphragm, and the main valve diaphragm deforms to control backflow. The valve core assembly opens or closes the flow chamber, and the check valve core opens unidirectionally from the inlet end to the outlet end. The flow regulating valve also includes an anti-backflow reversing valve, a flow pilot valve, a flow detection probe, and a leakage protection valve. The flow detection probe is located at the inlet end, and the feedback end of the flow detection probe is connected to the flow pilot valve. The inlet end, the anti-backflow reversing valve, the control chamber, the flow pilot valve, and the outlet end are sequentially connected to enable the regulating valve to be in a dynamic flow regulation state.

[0007] When the regulating valve is in the dynamic flow regulation state, the anti-backflow reversing valve switches to close the inlet end and the control chamber and connect the outlet end and the control chamber, so that the flow regulating valve switches to the emergency shut-off state and closes, and the check valve core closes in reverse.

[0008] When the regulating valve is in the dynamic flow regulation state, the leakage protection valve selectively puts the intermediate cavity into the differential pressure protection state or the leakage protection state according to the pressure difference between the intermediate cavity and the inlet end.

[0009] The anti-backflow reversing valve includes anti-backflow port one, anti-backflow port two, and anti-backflow port three. The flow pilot valve includes pilot valve port one, pilot valve port two, pilot valve port three, and pilot valve port four. The flow detection probe includes probe port one, probe port two, probe port three, and probe port four. Probe port one and probe port two are located inside the water inlet and are arranged front and back. Pilot valve port one is connected to probe port one via probe port three, and pilot valve port four is connected to probe port two via probe port four. The flow pilot valve includes a pilot valve body, a pilot valve diaphragm, a preload spring, and a pilot valve core. The pilot valve diaphragm divides the pilot valve body into an adjusting chamber and a communicating chamber. The pilot valve core is connected to the pilot valve body. The valve diaphragm is connected, and the pre-tightening spring is sleeved on the part of the pilot valve core located in the regulating chamber. The pilot valve port one is connected to the communicating chamber, and the pilot valve port four is connected to the regulating chamber. The pilot valve core selectively opens or closes the pilot valve port two and the pilot valve port three according to the pilot valve port one and the pilot valve port two. When the flow pilot valve is in the flow dynamic adjustment state, the anti-backflow port one is connected to the water inlet. The anti-backflow reversing valve connects the anti-backflow port two and the anti-backflow port three according to the pressure of the anti-backflow port one. The water inlet, the anti-backflow port two, the anti-backflow port three, the control chamber, the pilot valve port two, the pilot valve port three, and the water outlet can be connected in sequence.

[0010] The anti-backflow reversing valve also includes an anti-backflow port four and an anti-backflow port five. The anti-backflow port four is connected to the water outlet. The anti-backflow reversing valve selectively connects or shuts off the anti-backflow port three and the anti-backflow port five according to the pressure of the anti-backflow port four. The anti-backflow port five is connected to the water outlet.

[0011] The drain protection valve includes a connection port one, a connection port two, a connection port three, and a drain port. The drain protection valve includes a drain valve body, a drain valve core, and a drain spring. The connection port one is connected to the water inlet end. The connection ports two and three are both connected to the intermediate cavity. The connection ports one and three act on the two ends of the drain valve core, respectively. The drain spring is located at the end of the drain valve core near the connection port two. The drain valve core can move according to the pressure difference between the two ends to selectively connect the connection port two and the drain port.

[0012] The relief protection valve also includes an adjusting bolt, which is disposed on the relief valve housing, and the portion of the adjusting bolt located inside the relief valve housing abuts against the relief spring.

[0013] The check valve core includes a check bracket, a check spring, a check rod, and a check plate. The check bracket is disposed within the flow chamber. The check rod is movably disposed on the check bracket. The check plate is disposed on the check rod near the outlet end. The check spring is sleeved on the check rod, and the check spring causes the check rod to tend to move towards the outlet end. The movement of the check rod causes the check plate to open or close the flow chamber.

[0014] The anti-backflow reversing valve includes a reversing valve body and a reversing valve core, wherein the reversing valve core moves within the reversing valve body to switch the connection state.

[0015] The valve core assembly includes a valve stem and a valve plate. The valve stem is connected to the main valve diaphragm, and the valve plate is disposed in the portion of the valve stem located within the flow cavity.

[0016] The flow regulating valve also includes a regulating needle valve, and the anti-backflow reversing valve is connected to the control chamber via the regulating needle valve.

[0017] The working principle and beneficial effects of this invention are as follows:

[0018] This invention discloses an anti-backflow flow regulating valve with leakage protection. By installing an anti-backflow reversing valve, a leakage protection valve, a flow detection probe, and a flow pilot valve on the main valve body, the flow regulating valve, after opening, adjusts the connection state of each component to put the entire valve body into a dynamic flow regulation state. At this time, the valve body dynamically regulates the flow rate in conjunction with the flow rate at the inlet end. When the pressure at the outlet end suddenly increases, and water pollution may occur, the check valve core closes in reverse, and the connection state of each component is adjusted to make the valve core assembly close urgently. At this time, the reliability of anti-backflow is improved through two anti-backflow designs. Based on this, considering the decay of the seal of the check valve core, the intermediate cavity also has the function of allowing the intermediate cavity to leak through the leakage protection valve. So even if the seal of the check valve core decays, the intermediate cavity can still leak, which plays a further role in anti-backflow protection. Based on the above solution, the problem of the difficulty in maintaining the long-term reliability of valve anti-backflow in the prior art can be solved. Attached Figure Description

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] Figure 1 This is a schematic diagram of the valve body in its initial state in this invention;

[0021] Figure 2This is a schematic diagram of the valve body in the pressure reduction dynamic adjustment state in this invention;

[0022] Figure 3 This is a schematic diagram of the valve body in the closed and venting state in this invention.

[0023] In the diagram: 1. Main valve body, 2. Main valve diaphragm, 3. Inlet, 4. Outlet, 5. Control chamber, 6. Flow chamber, 7. Check valve core, 8. Intermediate chamber, 9. Anti-backflow directional valve, 10. Flow pilot valve, 11. Flow detection probe, 12. Relief protection valve, 13. Anti-backflow port one, 14. Anti-backflow port two, 15. Anti-backflow port three, 16. Pilot valve port one, 17. Pilot valve port two, 18. Pilot valve port three, 19. Pilot valve port four, 20. Probe port one, 21. Probe port two, 22. Probe port three, 23. Probe port four, 24. 25. Valve body, 26. Pilot valve diaphragm, 27. Preload spring, 28. Pilot valve core, 29. Adjusting chamber, 30. Connecting chamber, 31. Anti-backflow port four, 32. Anti-backflow port five, 33. Connection port one, 34. Connection port two, 35. Connection port three, 36. Drain port, 37. Drain valve body, 38. Drain valve core, 39. Drain spring, 40. Adjusting bolt, 41. Check bracket, 42. Check spring, 43. Check rod, 44. Check plate, 45. Reversing valve body, 46. Reversing valve core, 47. Valve stem, 48. Valve plate, 49. Adjusting needle valve. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0025] like Figures 1-3As shown, this embodiment proposes a backflow prevention flow regulating valve with leakage protection. The flow regulating valve includes a main valve body 1, a main valve diaphragm 2, and a valve core assembly. The main valve body 1 includes a valve cavity with an inlet end 3 and an outlet end 4. The main valve diaphragm 2 is disposed in the valve cavity and divides the valve cavity into a control cavity 5 and a flow passage cavity 6. The flow regulating valve also includes a check valve core 7. The valve core assembly and the check valve core 7 are sequentially disposed in the flow passage cavity 6. An intermediate cavity 8 is formed between the valve core assembly and the check valve core 7. The valve core assembly is connected to the main valve diaphragm 2. The main valve diaphragm 2 deforms to control... The valve core assembly opens or closes the flow chamber 6. The check valve core 7 opens unidirectionally from the inlet end 3 to the outlet end 4. The flow regulating valve also includes an anti-backflow reversing valve 9, a flow pilot valve 10, a flow detection probe 11, and a leakage protection valve 12. The flow detection probe 11 is located at the inlet end 3, and the feedback end of the flow detection probe 11 is connected to the flow pilot valve 10. The inlet end 3, the anti-backflow reversing valve 9, the control chamber 5, the flow pilot valve 10, and the outlet end 4 are sequentially connected to enable the regulating valve to be in a dynamic flow regulation state.

[0026] When the regulating valve is in the dynamic flow regulation state, the anti-backflow reversing valve 9 switches to close the inlet end 3 and the control chamber 5 and connects the outlet end 4 and the control chamber 5, so that the flow regulating valve switches to the emergency shut-off state and closes, and the check valve core 7 closes in reverse.

[0027] When the regulating valve is in the dynamic flow regulation state, the leakage protection valve 12 selectively puts the intermediate cavity 8 into the differential pressure protection state or the leakage protection state according to the pressure difference between the intermediate cavity 8 and the inlet end 3.

[0028] In this embodiment, the proposed anti-backflow flow regulating valve with leakage protection has a structure in which a valve cavity is set inside the main valve body 1. The valve cavity has an inlet end 3 and an outlet end 4. A main valve diaphragm 2 is set inside the valve cavity, dividing the valve cavity into a control cavity 5 and a flow passage cavity 6. The main valve diaphragm 2 is connected to the valve core assembly. The main valve diaphragm 2 deforms according to the pressure in the control cavity 5, thereby controlling the movement of the valve core assembly. The valve core assembly controls the opening and closing of the flow passage cavity 6. The main valve body 1 is also provided with a check valve core 7, an anti-backflow reversing valve 9, a leakage protection valve 12, a flow detection probe 11, and a flow pilot valve 10. Different connection states form different connection schemes, thereby making the entire flow regulating valve in a state of... Different states are used to deal with different scenarios. In the initial state of the flow regulating valve, the valve core assembly and the check valve core 7 are closed, the water pressure at the inlet 3 increases, and the water pressure reaches the outlet 4 through the anti-backflow reversing valve 9, the control chamber 5, and the flow pilot valve 10. The medium in the control chamber 5 flows to the outlet 4, so the water pressure is lower. At this time, the water pressure at the inlet 3 acts on the valve core assembly, thereby opening the valve body. At the same time, the check valve core 7 opens, and the inlet 3 and the outlet 4 are connected. The flow pilot valve 10 senses the flow at the inlet 3 through the flow detection probe 11, thereby fine-tuning the opening amount, adjusting the medium distribution flow in the control chamber 5, and then adjusting the deformation of the main valve diaphragm 2 to achieve dynamic flow regulation.

[0029] When the water pressure at the outlet 4 surges and is accompanied by potential contamination, the anti-backflow reversing valve 9 adjusts and switches to disconnect the inlet 3 from the control chamber 5 and connect the outlet 4 to the control chamber 5. Due to the surge in pressure at the outlet 4, the main valve diaphragm 2 responds quickly and deforms under the pressure of the water at the outlet 4, and the valve core assembly closes. At the same time, the check valve core 7 also closes, thus putting the valve body into an emergency shut-off state.

[0030] Based on this, the valve core assembly and the check valve core 7 are closed, and the intermediate cavity 8 is a closed space. Considering the decay of sealing reliability, if the check valve core 7 leaks, causing the pressure in the intermediate cavity 8 to rise, the intermediate cavity 8 will be protected by the relief protection valve 12. According to the pressure difference between the intermediate cavity 8 and the inlet end 3, if the pressure difference between the intermediate cavity 8 and the inlet end 3 reaches a certain threshold, the intermediate cavity 8 will directly vent. If the threshold is not reached, the pressure value of the intermediate cavity 8 will always be less than the pressure value of the inlet end 3, that is, the medium in the intermediate cavity 8 will not flow back to the inlet end 3 side. The above can achieve backflow prevention protection.

[0031] It should be noted that the multiple auxiliary valves set up based on the technical concept of this application to realize the functions of dynamic flow regulation, emergency shutdown and backflow prevention, that is, the connection status of each auxiliary valve is adjusted according to the flow change at the inlet end 3. If it is just a simple change in the valve body structure, quantity and connection method, it should fall within the protection scope of this application.

[0032] The anti-backflow reversing valve 9 includes an anti-backflow port 13, an anti-backflow port 24, and an anti-backflow port 35. The flow pilot valve 10 includes a pilot valve port 16, a pilot valve port 27, a pilot valve port 38, and a pilot valve port 49. The flow detection probe 11 includes a probe port 10, a probe port 21, a probe port 32, and a probe port 43. The probe port 10 and the probe port 21 are respectively located at the water inlet. The pilot valve 10 is arranged in a front-to-back configuration within end 3. Pilot valve port 16 is connected to probe port 20 via probe port 3 22, and pilot valve port 19 is connected to probe port 21 via probe port 4 23. The flow pilot valve 10 includes a pilot valve housing 24, a pilot valve diaphragm 25, a preload spring 26, and a pilot valve core 27. The pilot valve diaphragm 25 divides the pilot valve housing 24 into an adjustment chamber 28 and a communication chamber 29. The valve core 27 is connected to the pilot valve diaphragm 25. The pre-tightening spring 26 is sleeved on the portion of the pilot valve core 27 located in the regulating chamber 28. The pilot valve port 16 is connected to the communicating chamber 29, and the pilot valve port 4 19 is connected to the regulating chamber 28. The pilot valve core 27 selectively opens or closes the pilot valve port 27 and the pilot valve port 3 18 according to the pilot valve port 16 and the pilot valve port 27. When the flow pilot valve 10 is in the flow dynamic adjustment state, the anti-backflow port 13 is connected to the inlet end 3. The anti-backflow reversing valve 9 connects the anti-backflow port 24 and the anti-backflow port 35 according to the pressure of the anti-backflow port 13. The inlet end 3, the anti-backflow port 24, the anti-backflow port 35, the control chamber 5, the pilot valve port 27, the pilot valve port 3 18, and the outlet end 4 can be connected in sequence.

[0033] In this embodiment, the flow regulating valve is open and the inlet end 3 and outlet end 4 are in normal operating condition. The flow detection probe 11 is set at the inlet end 3. The part of the flow detection probe 11 located inside the inlet end 3 is sequentially provided with probe port 1 20 and probe port 21 along the direction of water flow. When the medium flows through the two ports, it can be converted into different pressure values. Specifically, the anti-backflow reversing valve 9 is in one of the reversing positions through the medium pressure of the anti-backflow port 13, so that the anti-backflow port 2 14 and anti-backflow port 3 15 are connected. The medium pressure of the inlet end 3 enters the control chamber 5 through the anti-backflow port 2 14 and anti-backflow port 3 15. The medium pressure in the control chamber 5 can be connected to the flow pilot valve 10 through the pilot valve port 2 17, and the pilot valve port 3 18 is connected to the outlet end 4. In the regulating chamber 28 inside the pilot valve body 24, the pre-tightening spring is... Spring 26 is sleeved on pilot valve core 27. Adjustment chamber 28 is connected to probe port 21 via pilot valve port 4 19 and probe port 4 23. Connecting chamber 29 is connected to probe port 20 via pilot valve port 1 16 and probe port 3 22. Initially, under the action of pre-tightening spring 26, pilot valve core 27 opens, the medium in control chamber 5 is diverted, resulting in a pressure decrease. Valve core assembly opens, and the flow rate gradually increases. Connecting chamber 29 and adjustment chamber 28 sense the pressure difference transmitted from flow detection probe 11 and compare it with pre-tightening spring 26 to adjust the opening of pilot valve core 27. When the pressure difference fed back by flow detection probe 11 is less than the preset adjustment pressure value, pre-tightening spring 26 causes pilot valve core 27 to move and increase the opening. Then the flow diversion in control chamber 5 increases, the valve core assembly controls the opening of flow passage chamber 6 to increase, and the flow compensation increases. Conversely, pilot valve core 27 decreases the opening.

[0034] The anti-backflow reversing valve 9 also includes an anti-backflow port 4 30 and an anti-backflow port 5 31. The anti-backflow port 4 30 is connected to the water outlet 4. The anti-backflow reversing valve 9 selectively connects or shuts off the anti-backflow port 3 15 and the anti-backflow port 5 31 according to the pressure of the anti-backflow port 4 30. The anti-backflow port 5 31 is connected to the water outlet 4.

[0035] In this embodiment, when the pressure at the outlet 4 suddenly increases, the anti-backflow port 30 of the anti-backflow reversing valve 9 senses the high pressure at the outlet 4. The anti-backflow reversing valve 9 then adjusts the connection state, closing the anti-backflow port 2 14 and the anti-backflow port 3 15, and connecting the anti-backflow port 3 15 with the anti-backflow port 5 31. The anti-backflow port 5 31 is connected to the outlet 4, and the high pressure at the outlet 4 enters the control chamber 5 through the anti-backflow port 5 31 and the anti-backflow port 3 15. The pressure in the control chamber 5 increases instantaneously, causing the pressure reducing regulating valve to close quickly and preventing backflow.

[0036] The drain protection valve 12 includes a first connection port 32, a second connection port 33, a third connection port 34, and a drain port 35. The drain protection valve 12 includes a drain valve body 36, a drain valve core 37, and a drain spring 38. The first connection port 32 is connected to the water inlet 3. The second connection port 33 and the third connection port 34 are both connected to the intermediate cavity 8. The first connection port 32 and the third connection port 34 act on both ends of the drain valve core 37. The drain spring 38 is disposed at the end of the drain valve core 37 near the second connection port 33. The drain valve core 37 can move according to the pressure difference between the two ends to selectively connect the second connection port 33 and the drain port 35.

[0037] In this embodiment, the relief valve 12 provides pressure protection and relief protection for the intermediate cavity 8 by sensing the medium pressure at the inlet 3 and the intermediate cavity 8. Specifically, the relief valve 12 senses the medium pressure at the inlet 3 through connection port 1 32 and senses the medium pressure in the intermediate cavity 8 through connection port 34. The two ends of the relief valve core 37 sense the medium pressure at the inlet 3 and the intermediate cavity 8, respectively. A relief spring 38 is also provided on the side near connection port 34. Therefore, the relief valve core 37 will only move when the medium pressure in the intermediate cavity 8 and the elastic force of the relief spring 38 are greater than the medium pressure at the inlet 3. After the relief valve core 37 moves, connection port 2 33 and relief port 35 will then open. When the flow regulating valve's anti-backflow emergency shut-off port is closed, the intermediate chamber 8 is sealed by the valve core assembly and the check valve core 7. When the combined force of the medium pressure in the intermediate chamber 8 and the spring force of the relief spring 38 is still less than the medium pressure at the inlet end 3, the relief protection valve 12 keeps the pressure value in the intermediate chamber 8 at a lower protection value to prevent backflow to the inlet end 3 due to the decay of the valve core assembly's sealing reliability. When the combined force of the medium pressure in the intermediate chamber 8 and the spring force of the relief spring 38 is greater than the medium pressure at the inlet end 3, the relief valve core 37 moves, connecting the second connection port 33 and the relief port 35, and the intermediate chamber 8 leaks and reduces pressure until the relief valve core 37 moves back to its original position, disconnecting the second connection port 33 and the relief port 35, thereby protecting the intermediate chamber 8 from leakage.

[0038] The relief protection valve 12 also includes an adjusting bolt 39, which is disposed on the relief valve housing 36, and the portion of the adjusting bolt 39 located inside the relief valve housing 36 abuts against the relief spring 38.

[0039] In this embodiment, an adjusting bolt 39 is provided on the relief protection valve 12. The compression of the relief spring 38 is adjusted by rotating the adjusting bolt 39 to the depth of screwing into the relief valve housing 36, thereby adjusting the operating pressure difference between the intermediate chamber 8 and the water inlet 3. The so-called operating pressure difference means that when it exceeds the operating pressure difference, the relief valve core 37 will perform a switching action.

[0040] The check valve core 7 includes a check bracket 40, a check spring 41, a check rod 42, and a check plate 43. The check bracket 40 is disposed in the flow chamber 6. The check rod 42 is movably disposed on the check bracket 40. The check plate 43 is disposed on the side of the check rod 42 near the outlet end 4. The check spring 41 is sleeved on the check rod 42. The check spring 41 causes the check rod 42 to tend to move towards the outlet end 4. The movement of the check rod 42 causes the check plate 43 to open or close the flow chamber 6.

[0041] In this embodiment, a check bracket 40 is provided in the flow cavity 6, and a check rod 42 passes through the middle of the check bracket. A check spring 41 is sleeved on the part of the check rod 42 that passes through the check bracket 40. When the check spring 41 is compressed, its elastic force causes the check rod 42 to tend to move towards the side closer to the water inlet 3. The check plate 43 on the check rod 42 is on the side closer to the water outlet 4. When the pressure changes from high to low along the direction from the water inlet 3 to the water outlet 4, the pressure of the medium acting on the check plate 43 overcomes the elastic force of the check spring 41, thus conducting. When the pressure at the water outlet 4 increases, the check plate 43 closes under the action of the check spring 41, thus closing the flow cavity 6.

[0042] The anti-backflow reversing valve 9 includes a reversing valve housing 44 and a reversing valve core 45, wherein the reversing valve core 45 moves within the reversing valve housing 44 to switch the connection state.

[0043] In this embodiment, the anti-backflow reversing valve 9 adopts a structure in which a reversing valve core 45 is set inside the reversing valve housing 44. The reversing valve core 45 can be moved by the medium pressure, spring force or external pressing force to adjust the connection state and realize different working states of the flow regulating valve.

[0044] The valve core assembly includes a valve stem 46 and a valve plate 47. The valve stem 46 is connected to the main valve diaphragm 2, and the valve plate 47 is disposed in the portion of the valve stem 46 located within the flow cavity 6.

[0045] In this embodiment, the valve core assembly consists of a valve stem 46 and a valve plate 47. The valve stem 46 is connected to the main valve diaphragm 2. A guide structure that cooperates with the valve stem 46 is provided in the main valve body 1 so that the deformation of the main valve diaphragm 2 can drive the valve stem 46 to move. The end of the valve stem 46 is provided with a valve plate 47. The valve plate 47 can abut against and seal with the flow channel structure in the flow cavity 6 to realize the closure and opening of the flow channel.

[0046] The flow regulating valve also includes a regulating needle valve 48, and the anti-backflow reversing valve 9 is connected to the control chamber 5 via the regulating needle valve 48.

[0047] In this embodiment, the anti-backflow reversing valve 9 is connected to the control chamber 5 through the regulating needle valve 48. The regulating needle valve 48 consists of a needle valve body and a needle valve core. Rotating the needle valve core can adjust the opening of the regulating needle valve 48 and control the flow rate of the diverted flow.

[0048] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A backflow-preventive flow regulating valve with a leakage protection, characterized in that, The flow regulating valve includes a main valve body (1), a main valve diaphragm (2), and a valve core assembly. The main valve body (1) includes a valve cavity with an inlet end (3) and an outlet end (4). The main valve diaphragm (2) is disposed in the valve cavity and divides the valve cavity into a control cavity (5) and a flow passage cavity (6). The flow regulating valve also includes a check valve core (7). The valve core assembly and the check valve core (7) are sequentially disposed in the flow passage cavity (6). An intermediate cavity (8) is formed between the valve core assembly and the check valve core (7). The valve core assembly is connected to the main valve diaphragm (2). The main valve diaphragm (2) deforms to control the valve core assembly to open or close the flow passage cavity. The control chamber (6) has a check valve core (7) that opens unidirectionally from the inlet end (3) to the outlet end (4). The flow regulating valve also includes an anti-backflow reversing valve (9), a flow pilot valve (10), a flow detection probe (11), and a leakage protection valve (12). The flow detection probe (11) is located at the inlet end (3). The feedback end of the flow detection probe (11) is connected to the flow pilot valve (10). The inlet end (3), the anti-backflow reversing valve (9), the control chamber (5), the flow pilot valve (10), and the outlet end (4) are connected in sequence to make the regulating valve in a dynamic flow regulation state. When the regulating valve is in the dynamic flow regulation state, the anti-backflow reversing valve (9) switches to close the inlet end (3) and the control chamber (5) and connect the outlet end (4) and the control chamber (5) so that the flow regulating valve switches to the emergency shut-off state and closes, and the check valve core (7) closes in the reverse direction. When the regulating valve is in the dynamic flow regulation state, the leakage protection valve (12) selectively puts the intermediate cavity (8) into the differential pressure protection state or the leakage protection state according to the pressure difference between the intermediate cavity (8) and the inlet end (3); The drain protection valve (12) includes a first connection port (32), a second connection port (33), a third connection port (34), and a drain port (35). The drain protection valve (12) includes a drain valve body (36), a drain valve core (37), and a drain spring (38). The first connection port (32) is connected to the inlet end (3). The second connection port (33) and the third connection port (34) are both connected to the intermediate cavity (8). The first connection port (32) and the third connection port (34) act on the two ends of the drain valve core (37). The drain spring (38) is located at the end of the drain valve core (37) near the second connection port (33). The drain valve core (37) can move according to the pressure difference between the two ends so that the second connection port (33) and the drain port (35) can be selectively connected.

2. The anti-backflow flow regulating valve with leakage protection according to claim 1, characterized in that, The anti-backflow reversing valve (9) includes an anti-backflow port one (13), an anti-backflow port two (14), and an anti-backflow port three (15). The flow pilot valve (10) includes a pilot valve port one (16), a pilot valve port two (17), a pilot valve port three (18), and a pilot valve port four (19). The flow detection probe (11) includes a probe port one (20), a probe port two (21), a probe port three (22), and a probe port four (23). The probe port one (20) and the probe port two (21) are respectively located in the... The inlet valve (3) is arranged in a front-to-back distribution. The pilot valve port one (16) is connected to the probe port one (20) via the probe port three (22). The pilot valve port four (19) is connected to the probe port two (21) via the probe port four (23). The flow pilot valve (10) includes a pilot valve body (24), a pilot valve diaphragm (25), a preload spring (26), and a pilot valve core (27). The pilot valve diaphragm (25) divides the pilot valve body (24) into an adjustment chamber (28) and a communication chamber (29). The pilot valve core (27) is connected to the pilot valve diaphragm (25). The preload spring (26) is sleeved on the portion of the pilot valve core (27) located in the regulating cavity (28). The first pilot valve port (16) is connected to the communicating cavity (29), and the fourth pilot valve port (19) is connected to the regulating cavity (28). The pilot valve core (27) selectively opens or closes the second pilot valve port (17) and the third pilot valve port (18) according to the first pilot valve port (16) and the second pilot valve port (17). When the flow rate control valve (10) is in the dynamic flow rate adjustment state, the anti-backflow port one (13) is connected to the water inlet (3), and the anti-backflow reversing valve (9) connects the anti-backflow port two (14) and the anti-backflow port three (15) according to the pressure of the anti-backflow port one (13). The water inlet (3), the anti-backflow port two (14), the anti-backflow port three (15), the control chamber (5), the pilot valve port two (17), the pilot valve port three (18) and the water outlet (4) can be connected in sequence.

3. The anti-backflow flow regulating valve with leakage protection according to claim 2, characterized in that, The anti-backflow reversing valve (9) also includes an anti-backflow port four (30) and an anti-backflow port five (31). The anti-backflow port four (30) is connected to the water outlet (4). The anti-backflow reversing valve (9) selectively connects or shuts off the anti-backflow port three (15) and the anti-backflow port five (31) according to the pressure of the anti-backflow port four (30). The anti-backflow port five (31) is connected to the water outlet (4).

4. The anti-backflow flow regulating valve with leakage protection according to claim 1, characterized in that, The relief protection valve (12) also includes an adjusting bolt (39), which is disposed on the relief valve housing (36), and the portion of the adjusting bolt (39) located inside the relief valve housing (36) abuts against the relief spring (38).

5. The anti-backflow flow regulating valve with leakage protection according to claim 3, characterized in that, The check valve core (7) includes a check bracket (40), a check spring (41), a check rod (42), and a check plate (43). The check bracket (40) is disposed in the flow chamber (6). The check rod (42) is movably disposed on the check bracket (40). The check plate (43) is disposed on the check rod (42) on the side near the outlet end (4). The check spring (41) is sleeved on the check rod (42). The check spring (41) causes the check rod (42) to have a tendency to move towards the outlet end (4). The movement of the check rod (42) causes the check plate (43) to open or close the flow chamber (6).

6. The anti-backflow flow regulating valve with leakage protection according to claim 3, characterized in that, The anti-backflow reversing valve (9) includes a reversing valve housing (44) and a reversing valve core (45), wherein the reversing valve core (45) moves within the reversing valve housing (44) to switch the connection state.

7. The anti-backflow flow regulating valve with leakage protection according to claim 6, characterized in that, The valve core assembly includes a valve stem (46) and a valve plate (47). The valve stem (46) is connected to the main valve diaphragm (2), and the valve plate (47) is disposed in the part of the valve stem (46) located in the flow cavity (6).

8. The anti-backflow flow regulating valve with leakage protection according to claim 7, characterized in that, The flow regulating valve also includes a regulating needle valve (48), and the anti-backflow reversing valve (9) is connected to the control chamber (5) via the regulating needle valve (48).

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