Differential pressure regulating valve with emergency turn-off and backflow prevention functions

Abstract

The invention relates to the technical field of valve bodies, and provides a differential pressure regulating valve with emergency shutoff and backflow prevention functions, which comprises a main valve body, a main valve membrane and a valve core assembly, the main valve body comprises a valve cavity with a water inlet end and a water outlet end, and the main valve membrane is arranged in the valve cavity and divides the valve cavity into a control cavity and an overflowing cavity; the pressure difference regulating valve is in a dynamic pressure difference regulating state, when the pressure difference regulating valve is in the dynamic pressure difference regulating state, the shut-off reversing valve changes the position so as to close the communication of the pressure difference pilot valve and the water outlet end, and the pressure difference regulating valve is switched to an emergency shut-off state so as to be closed; when the differential pressure regulating valve is in a differential pressure dynamic regulating state, the anti-backflow reversing valve changes the position to close the communication between the water inlet end and the control cavity and enable the water outlet end to communicate with the control cavity, and the differential pressure regulating valve is switched to be in an anti-backflow state so as to be closed. The problem that in the prior art, downstream leakage or backflow of a traditional differential pressure regulating valve cannot be blocked in time is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valve body, in particular to a pressure differential regulating valve with emergency shut-off and anti-backflow function. BACKGROUND

[0002] The pressure differential regulating valve generally refers to a self-operated pressure differential control valve. The self-operated pressure differential control valve does not need external energy and relies on the pressure change of the controlled medium to automatically adjust, automatically eliminates the flow deviation caused by the residual pressure head and pressure fluctuation of the pipe network, and constantly maintains the pressure difference at the inlet and outlet of the user, which is helpful to stabilize the system operation.

[0003] Although the pressure differential regulating valve technology has made significant progress, there are still some problems in practical application. For example, when the traditional pressure differential regulating valve deals with a large amount of water drainage due to downstream emergency leakage, it will continue to supply water, resulting in a large waste of water resources; there is no blocking function when the downstream pressure rises and backflows, especially when there is pollution in the downstream. Based on the above problems, there is an urgent need for a valve body that can solve the above problems. SUMMARY

[0004] The present application provides a pressure differential regulating valve with emergency shut-off and anti-backflow function, which solves the problem that the traditional pressure differential regulating valve in the prior art cannot timely block the downstream leakage or backflow.

[0005] The technical scheme of the present application is as follows: A pressure differential regulating valve with emergency shut-off and anti-backflow function, the pressure differential regulating valve comprises a main valve body, a main valve membrane and a valve core assembly, the main valve body comprises a valve cavity with a water inlet end and a water outlet end, the main valve membrane is arranged in the valve cavity and divides the valve cavity into a control cavity and a flow cavity, the valve core assembly is connected with the main valve membrane, the main valve membrane deforms to control the valve core assembly to open or close the flow cavity, the pressure differential regulating valve further comprises an anti-backflow reversing valve, a reset reversing valve, a shut-off reversing valve and a pressure differential guide valve, wherein the water inlet end, the anti-backflow reversing valve, the control cavity, the pressure differential guide valve, the shut-off reversing valve and the water outlet end are sequentially communicated, and the water inlet end and the pressure differential guide valve are communicated to make the pressure differential regulating valve in a pressure differential dynamic regulating state; When the pressure differential regulating valve is in the pressure differential dynamic regulating state, the shut-off reversing valve is shifted to close the pressure differential guide valve and the water outlet end, so that the pressure differential regulating valve is switched to an emergency shut-off state and is closed; When the pressure differential regulating valve is in the pressure differential dynamic regulating state, the anti-backflow reversing valve is shifted to close the water inlet end and the control cavity and make the water outlet end and the control cavity communicated, so that the pressure differential regulating valve is switched to an anti-backflow state and is closed; When the pressure difference regulating valve is closed, the reset reversing valve is switched to make the control cavity, the reset reversing valve, the shutdown reversing valve and the water outlet end communicate, so that the pressure difference regulating valve enters the open state.

[0006] The anti-backflow reversing valve comprises anti-backflow port one, anti-backflow port two and anti-backflow port three, the pressure difference guide valve comprises guide valve port one, guide valve port two and guide valve port three, the shutdown reversing valve comprises shutdown port one and shutdown port two, the pressure difference guide valve comprises guide valve housing, guide valve valve film, pre-tightening spring and guide valve valve core, the guide valve valve film divides the guide valve housing into sensing cavity and communication cavity, the guide valve valve core is connected with the guide valve valve film, the pre-tightening spring is sleeved on the part of the guide valve valve core located in the sensing cavity, the guide valve port one communicates with the sensing cavity, the guide valve port two and the guide valve port three both communicate with the communication cavity, when the pressure difference regulating valve is in the pressure difference dynamic regulating state, the anti-backflow port one communicates with the water inlet end, the anti-backflow reversing valve makes the anti-backflow port two and the anti-backflow port three communicate according to the pressure of the anti-backflow port one, the water inlet end, the anti-backflow port two, the anti-backflow port three, the control cavity, the guide valve port two, the guide valve port three, the shutdown port one, the shutdown port two and the water outlet end can communicate in sequence, and the guide valve port one communicates with the water inlet end.

[0007] The shutdown reversing valve further comprises shutdown port three, the shutdown port three communicates with the water outlet end, and the shutdown reversing valve makes the shutdown port one and the shutdown port two selectively communicate or shut down according to the pressure of the shutdown port three.

[0008] The anti-backflow reversing valve further comprises anti-backflow port four and anti-backflow port five, the anti-backflow port four communicates with the water outlet end, the anti-backflow reversing valve makes the anti-backflow port three and the anti-backflow port five selectively communicate or shut down according to the pressure of the anti-backflow port four, and the anti-backflow port five communicates with the water outlet end.

[0009] The reset reversing valve further comprises reset port one, reset port two and reset port three, the shutdown reversing valve further comprises shutdown port four, the reset reversing valve further comprises reset button, the reset port three communicates with the water outlet end, the reset reversing valve makes the reset port one and the reset port two be closable according to the pressure of the reset port three, the reset button makes the reset port one and the reset port two be conductive, and the shutdown reversing valve makes the shutdown port four and the shutdown port two be selectively conductive or closed according to the pressure of the shutdown port three.

[0010] The anti-backflow reversing valve, the reset reversing valve and the shutdown reversing valve each comprise a reversing valve shell and a reversing valve core, and the reversing valve core moves in the reversing valve shell to switch a communication state.

[0011] The valve core assembly comprises a valve stem connected with the main valve film and a valve plate arranged at the part of the valve stem located in the flow cavity.

[0012] The pressure difference regulating valve further comprises an adjusting needle valve, and the anti-backflow reversing valve is communicated with the control cavity through the adjusting needle valve.

[0013] The working principle and beneficial effects of the present application are as follows: In the present application, a pressure difference regulating valve with emergency shutdown and anti-backflow functions is disclosed, which comprises a main valve body, a valve cavity arranged in the main valve body, a water inlet end and a water outlet end of the valve cavity, a main valve film arranged in the valve cavity, a control cavity and a flow cavity divided by the main valve film, a valve core assembly connected with the main valve film, and a pressure difference guide valve, an anti-backflow reversing valve, a reset reversing valve, a shutdown reversing valve and a control valve body arranged on the main valve body. Different communication schemes between the control valve bodies are controlled to make the pressure difference regulating valve in different states to cope with different scenes. After the pressure difference regulating valve is opened, the pressure of the water inlet end and the water outlet end changes, so that the communication states of the auxiliary valves are changed. First, when the water inlet end and the water outlet end are in a normal working state, the pressure difference guide valve dynamically adjusts the pressure difference between the water inlet end and the water outlet end to make the pressure difference between the water inlet end and the water outlet end within a preset pressure range. When the water outlet end has a pipe burst leading to a sharp increase in the water discharge, the communication state of the shutdown reversing valve is changed to quickly close the valve to enter an emergency shutdown state. When the pressure of the water outlet end suddenly increases due to a fault, the anti-backflow reversing valve acts, and the pressure difference regulating valve changes from a dynamic adjustment state to an anti-backflow state to quickly close. The above scheme solves the problem that the downstream leakage or backflow of the traditional pressure difference regulating valve cannot be timely blocked. BRIEF DESCRIPTION OF DRAWINGS

[0014] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0015] Figure 1 FIG. 1 is a structure schematic diagram of the initial state of the pressure difference regulating valve of the present application; Figure 2 FIG. 2 is a structure schematic diagram of the water inlet state of the pressure difference regulating valve of the present application; Figure 3 FIG. 3 is a structure schematic diagram of the dynamic adjustment state of the pressure difference regulating valve of the present application; Figure 4 FIG. 4 is a structure schematic diagram of the emergency shutdown state of the pressure difference regulating valve of the present application; Figure 5This is a schematic diagram of the differential pressure regulating valve in the pressure anti-backflow shut-off state of the present invention; In the diagram: 1. Main valve body; 2. Main valve diaphragm; 3. Inlet; 4. Outlet; 5. Control chamber; 6. Flow chamber; 7. Anti-backflow directional valve; 8. Reset directional valve; 9. Shut-off directional valve; 10. Differential pressure pilot valve; 11. Anti-backflow port one; 12. Anti-backflow port two; 13. Anti-backflow port three; 14. Anti-backflow port four; 15. Anti-backflow port five; 16. Pilot valve port one; 17. Pilot valve port two; 18. 19. Pilot valve port 3; 20. Shut-off port 1; 21. Shut-off port 2; 22. Shut-off port 3; 23. Shut-off port 4; 24. Pilot valve body; 25. Pilot valve diaphragm; 26. Preload spring; 27. Pilot valve core; 28. Sensing chamber; 29. ​​Communicating chamber; 30. Reset port 1; 31. Reset port 2; 32. Reset button; 33. Valve stem; 34. Valve plate; 35. Adjusting needle valve. Detailed Implementation

[0016] 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.

[0017] like Figures 1-5 As shown, this embodiment proposes a differential pressure regulating valve with emergency shut-off and anti-backflow functions. The differential pressure 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 cavity 6. The valve core assembly is connected to the main valve diaphragm 2. The deformation of the main valve diaphragm 2 controls the valve core assembly to open or close the flow cavity 6. The differential pressure regulating valve also includes an anti-backflow reversing valve 7, a reset reversing valve 8, a shut-off reversing valve 9, and a differential pressure pilot valve 10. The inlet end 3, the anti-backflow reversing valve 7, the control cavity 5, the differential pressure pilot valve 10, the shut-off reversing valve 9, and the outlet end 4 are sequentially connected, and the inlet end 3 and the differential pressure pilot valve 10 are connected to enable the differential pressure regulating valve to be in a differential pressure dynamic regulation state. When the differential pressure regulating valve is in the differential pressure dynamic regulation state, the shut-off reversing valve 9 switches to close the differential pressure pilot valve 10 and the outlet end 4, so that the differential pressure regulating valve switches to the emergency shut-off state and is thus closed. When the pressure difference regulating valve is in the pressure difference dynamic regulating state, the anti-backflow reversing valve 7 is switched to close the water inlet end 3 and the control cavity 5 and to connect the water outlet end 4 and the control cavity 5, so as to switch the pressure difference regulating valve to the anti-backflow state and thus be closed; When the pressure difference regulating valve is closed, the reset reversing valve 8 is switched to connect the control cavity 5, the reset reversing valve 8, the shutdown reversing valve 9 and the water outlet end 4, so as to make the pressure difference regulating valve enter the open state.

[0018] In the embodiment, a pressure difference regulating valve with emergency shutdown and anti-backflow functions is disclosed. The pressure difference regulating valve is provided with a valve cavity in a main valve body 1, the valve cavity has a water inlet end 3 and a water outlet end 4, a main valve film 2 is arranged in the valve cavity, the valve cavity is divided into a control cavity 5 and a flow cavity 6, the main valve film 2 is connected with a valve core assembly, the main valve film 2 deforms to control the valve core assembly according to the pressure in the control cavity 5, the valve core assembly controls the on-off of the flow cavity 6, and the pressure difference regulating valve is further provided with an anti-backflow reversing valve 7, a reset reversing valve 8, a shutdown reversing valve 9 and a pressure difference guide valve 10 on the main valve body 1. Different connection schemes between the valve bodies are controlled, so that the pressure difference regulating valve is in different states to cope with different scenes. After the pressure difference regulating valve is opened, the pressure of the water inlet end 3 and the water outlet end 4 changes, so that each auxiliary valve changes the connection state. First, when the water inlet end 3 and the water outlet end 4 are in a normal working state, the pressure difference guide valve 10 dynamically adjusts according to the pressure difference between the water inlet end 3 and the water outlet end 4, so that the pressure difference between the water inlet end 3 and the water outlet end 4 is within a preset pressure range. When the water outlet end 4 has a burst pipe leading to a sharp increase in the water discharge, the shutdown reversing valve 9 changes the connection state, so as to quickly close and enter an emergency shutdown state. When the pressure of the water outlet end 4 suddenly increases due to a fault, the anti-backflow reversing valve 7 acts, and the pressure difference regulating valve changes from the dynamic adjustment state to the anti-backflow state and is quickly closed.

[0019] It should be noted that the multiple auxiliary valves are arranged based on the technical concept of the present application to realize the functions of pressure difference dynamic regulation, emergency shutdown and anti-backflow, that is, the connection state of each auxiliary valve is adjusted according to the pressure change of the water inlet end 3 and the water outlet end 4. If only the valve body structure, number and connection mode are simply changed, they should fall within the protection scope of the present application.

[0020] The anti-backflow reversing valve 7 comprises an anti-backflow port one 11, an anti-backflow port two 12, and an anti-backflow port three 13; the pressure difference guide valve 10 comprises a guide valve port one 16, a guide valve port two 17, and a guide valve port three 18; the closing reversing valve 9 comprises a closing port one 19 and a closing port two 20; the pressure difference guide valve 10 comprises a guide valve shell 23, a guide valve membrane 24, a pre-tightening spring 25, and a guide valve spool 26; the guide valve membrane 24 divides the guide valve shell 23 into a sensing cavity 27 and a communication cavity 28; the guide valve spool 26 is connected with the guide valve membrane 24; the pre-tightening spring 25 is sleeved on the part of the guide valve spool 26 located in the sensing cavity 27; the guide valve port one 16 communicates with the sensing cavity 27; the guide valve port two 17 and the guide valve port three 18 both communicate with the communication cavity 28; when the pressure difference regulating valve is in the pressure difference dynamic regulating state, the anti-backflow port one 11 communicates with the water inlet end 3; the anti-backflow reversing valve 7 makes the anti-backflow port two 12 and the anti-backflow port three 13 communicate according to the pressure of the anti-backflow port one 11; the water inlet end 3, the anti-backflow port two 12, the anti-backflow port three 13, the control cavity 5, the guide valve port two 17, the guide valve port three 18, the closing port one 19, the closing port two 20, and the water outlet end 4 can communicate in sequence; and the guide valve port one 16 communicates with the water inlet end 3.

[0021] In the embodiment, the pressure difference regulating valve has been opened and the water inlet end 3 and the water outlet end 4 are in the normal operating state; the pressure difference guide valve 10 can sense the pressure difference between the water inlet end 3 and the water outlet end 4; the pressure difference guide valve 10 can set a certain value of the pressure difference by the pre-tightening spring 25 abutting against the guide valve spool 26; when the pressure difference between the water inlet end 3 and the water outlet end 4 is greater than the preset value, the guide valve membrane 24 deforms, the guide valve spool 26 guides the guide valve port two 17 and the guide valve port three 18, the water pressure in the control cavity 5 flows to the water outlet end 4 through the guide valve port two 17, the guide valve port three 18, the closing port one 19, and the closing port two 20, thereby reducing the water pressure in the control cavity 5, increasing the opening degree of the pressure difference regulating valve, and increasing the pressure of the water outlet end 4, so that the pressure difference between the water inlet end 3 and the water outlet end 4 decreases to the preset pressure difference range; when the pressure difference between the water inlet end 3 and the water outlet end 4 is less than the preset value, the guide valve membrane 24 in the pressure difference guide valve 10 deforms upward, the pressure difference guide valve 10 moves toward the closing trend, the water diversion in the control cavity 5 decreases, the pressure rises, the opening degree of the pressure difference regulating valve decreases, the water supply of the water inlet end 3 to the water outlet end 4 decreases, thereby gradually reducing the pressure of the water outlet end 4 and gradually approaching the preset value of the increasing trend of the pressure difference between the water inlet end 3 and the water outlet end 4; when the pressure difference between the water inlet end 3 and the water outlet end 4 is equal to the preset value, the pressure difference guide valve 10 is closed, the pressure in the control cavity 5 rises, the pressure difference regulating valve is closed, and the pressure difference between the water inlet end 3 and the water outlet end 4 is maintained at the preset value.

[0022] The shutoff reversing valve 9 further comprises a shutoff port three 21, which is communicated with the water outlet 4, and the shutoff reversing valve 9 selectively communicates or shuts off the shutoff port one 19 and the shutoff port two 20 according to the pressure of the shutoff port three 21.

[0023] In the embodiment, when the pressure difference regulating valve is in the pressure difference dynamic adjustment state, if the water outlet 4 is broken, the water flow of the water outlet 4 increases, and the water flow of the water inlet 3 increases. Due to the increase of the water flow, the water flow speed increases, and the high-speed water flow has the water flow injection principle, so that the water pressure at the shutoff port three 21 is reduced to a very low level, or even to zero pressure. The shutoff reversing valve 9 adjusts the communication state according to the pressure of the shutoff port three 21, so that the shutoff port one 19 and the shutoff port two 20 are shut off, and the water in the control cavity 5 cannot be shunted to the water outlet 4. The pressure in the control cavity 5 rapidly increases, so that the flow cavity 6 of the pressure difference regulating valve is rapidly shut off, the emergency shutoff function is realized, and water resource waste is avoided.

[0024] The anti-backflow reversing valve 7 further comprises an anti-backflow port four 14 and an anti-backflow port five 15, the anti-backflow port four 14 is communicated with the water outlet 4, the anti-backflow reversing valve 7 selectively communicates or shuts off the anti-backflow port three 13 and the anti-backflow port five 15 according to the pressure of the anti-backflow port four 14, and the anti-backflow port five 15 is communicated with the water outlet 4.

[0025] In the embodiment, when the pressure of the water outlet 4 suddenly increases, the anti-backflow port four 14 of the anti-backflow reversing valve 7 senses that the pressure of the water outlet 4 is high, and the anti-backflow reversing valve 7 adjusts the communication state, so that the anti-backflow port two 12 and the anti-backflow port three 13 are shut off, the anti-backflow port three 13 is communicated with the anti-backflow port five 15, the anti-backflow port five 15 is communicated with the water outlet 4, and the high pressure of the water outlet 4 enters the control cavity 5 through the anti-backflow port five 15 and the anti-backflow port three 13. The pressure of the control cavity 5 instantaneously increases, so that the pressure difference regulating valve is rapidly shut off, and backflow is avoided.

[0026] The reset reversing valve 8 further comprises a reset port one 29, a reset port two 30 and a reset port three 31, the shutoff reversing valve 9 further comprises a shutoff port four 22, the reset reversing valve 8 further comprises a reset button 32, the reset port three 31 is communicated with the water outlet 4, the reset reversing valve 8 closes the reset port one 29 and the reset port two 30 according to the pressure of the reset port three 31, the reset button 32 makes the reset port one 29 and the reset port two 30 conductive, and the shutoff reversing valve 9 selectively conducts or closes the shutoff port four 22 and the shutoff port two 20 according to the pressure of the shutoff port three 21.

[0027] In the embodiment, when the pressure difference regulating valve is in the closed state, initial opening is needed. The communication state of the reset reversing valve 8 is changed to slowly open the pressure difference regulating valve. Specifically, the water inlet end 3 has higher pressure than the water outlet end 4. The communication position of the anti-backflow reversing valve 7 is the communication between the anti-backflow port two 12 and the anti-backflow port three 13. The pressure of the water inlet end 3 enters the control cavity 5 through the anti-backflow port two 12 and the anti-backflow port three 13. The pressure from the control cavity 5 to the reset port one 29 and the reset port two 30 of the reset reversing valve 8 enters the shutoff port four 22. The shutoff port three 21 of the shutoff reversing valve 9 has low pressure. The communication state of the shutoff port is the communication between the shutoff port four 22 and the shutoff port two 20. The pressure output from the reset reversing valve 8 enters the water outlet end 4 through the shutoff port four 22 and the shutoff port two 20. The pressure in the control cavity 5 is reduced due to the shunt. The pressure of the water inlet end 3 is applied to the valve core assembly and is greater than the pressure applied to the main valve film 2 by the control cavity 5. The overflow cavity 6 of the pressure difference regulating valve is slowly opened. At this time, the pressure of the water outlet end 4 gradually increases. The pressure of the water outlet end 4 increases and applies pressure to the reset port three 31 of the reset reversing valve 8 and the shutoff port three 21 of the shutoff reversing valve 9, so as to change the communication state of the reset reversing valve 8 and the shutoff reversing valve 9. The reset port one 29 and the reset port two 30 of the reset reversing valve 8 are shut off. The shutoff port four 22 and the shutoff port two 20 of the shutoff reversing valve 9 are shut off. The shutoff port one 19 and the shutoff port two 20 are communicated, so as to connect the water outlet end 4 to the guide valve port three 18 of the pressure difference guide valve 10. The pressure difference regulating valve enters the pressure difference dynamic adjustment state from the initial opening state.

[0028] The anti-backflow reversing valve 7, the reset reversing valve 8 and the shutoff reversing valve 9 all include a reversing valve shell and a reversing valve core. The reversing valve core moves in the reversing valve shell to switch the communication state.

[0029] In the embodiment, the anti-backflow reversing valve 7, the reset reversing valve 8 and the shutoff reversing valve 9 all adopt the structure form that the reversing valve core is arranged in the reversing valve shell. The reversing valve core can move to adjust the communication state by the medium pressure or the spring force or the external pressing force, so as to realize different working states of the pressure difference regulating valve.

[0030] The valve core assembly includes a valve rod 33 and a valve plate 34. The valve rod 33 is connected with the main valve film 2. The valve plate 34 is arranged at the part of the valve rod 33 in the overflow cavity 6.

[0031] In the embodiment, the valve core assembly is the valve rod 33 and the valve plate 34. The valve cover is connected with the main valve film 2. The guide structure matched with the valve rod 33 is arranged in the main valve body 1. The deformation of the main valve film 2 can drive the valve rod 33 to move. The end of the valve rod 33 is provided with the valve plate 34. The valve plate 34 can abut and seal with the overflow passage structure in the overflow cavity 6, so as to realize the closing and conduction of the overflow passage.

[0032] The pressure differential regulating valve further comprises a regulating needle valve 35, and the anti-backflow reversing valve 7 communicates with the control cavity 5 through the regulating needle valve 35.

[0033] In the embodiment, the anti-backflow reversing valve 7 communicates with the control cavity 5 through the regulating needle valve 35, the regulating needle valve 35 is composed of a needle valve shell and a needle valve spool, and rotating the needle valve spool can adjust the opening of the regulating needle valve 35 to control the flow of the shunt.

[0034] The above merely describes the preferred embodiment of the present application, but should not be used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A differential pressure regulating valve having emergency shut-off and anti-backflow functions, characterized by, The pressure difference regulating valve comprises a main valve body (1), a main valve film (2) and a valve core assembly, the main valve body (1) comprises a valve cavity with a water inlet end (3) and a water outlet end (4), the main valve film (2) is arranged in the valve cavity and divides the valve cavity into a control cavity (5) and a flow cavity (6), the valve core assembly is connected with the main valve film (2), the main valve film (2) deforms to control the valve core assembly to open or close the flow cavity (6), the pressure difference regulating valve further comprises an anti-backflow reversing valve (7), a reset reversing valve (8), a shutdown reversing valve (9) and a pressure difference guide valve (10), wherein the water inlet end (3), the anti-backflow reversing valve (7), the control cavity (5), the pressure difference guide valve (10), the shutdown reversing valve (9) and the water outlet end (4) are sequentially communicated, and the water inlet end (3) and the pressure difference guide valve (10) are communicated to make the pressure difference regulating valve in a pressure difference dynamic regulating state; When the pressure difference regulating valve is in the pressure difference dynamic regulating state, the shutdown reversing valve (9) is switched to close the pressure difference guide valve (10) and the water outlet end (4), so that the pressure difference regulating valve switches to an emergency shutdown state and is closed; When the pressure difference regulating valve is in the pressure difference dynamic regulating state, the anti-backflow reversing valve (7) is switched to close the water inlet end (3) and the control cavity (5) and make the water outlet end (4) and the control cavity (5) communicated, so that the pressure difference regulating valve switches to an anti-backflow state and is closed; When the pressure difference regulating valve is closed, the reset reversing valve (8) is switched to make the control cavity (5), the reset reversing valve (8), the shutdown reversing valve (9) and the water outlet end (4) communicated, so that the pressure difference regulating valve enters an opening state.

2. The pressure differential regulating valve with emergency shut-off and anti-backflow function according to claim 1, characterized in that, The anti-backflow reversing valve (7) comprises an anti-backflow port one (11), an anti-backflow port two (12), and an anti-backflow port three (13); the pressure-difference guide valve (10) comprises a guide valve port one (16), a guide valve port two (17), and a guide valve port three (18); the shut-off reversing valve (9) comprises a shut-off port one (19) and a shut-off port two (20); the pressure-difference guide valve (10) comprises a guide valve housing (23), a guide valve diaphragm (24), a pre-tightening spring (25), and a guide valve spool (26); the guide valve diaphragm (24) divides the guide valve housing (23) into a sensing cavity (27) and a communication cavity (28); the guide valve spool (26) is connected with the guide valve diaphragm (24); the pre-tightening spring (25) is sleeved on the part of the guide valve spool (26) located in the sensing cavity (27); the guide valve port one (16) is in communication with the sensing cavity (27); the guide valve port two (17) and the guide valve port three (18) are both in communication with the communication cavity (28); when the pressure-difference regulating valve is in a pressure-difference dynamic regulating state, the anti-backflow port one (11) is in communication with the water inlet end (3); the anti-backflow reversing valve (7) makes the anti-backflow port two (12) and the anti-backflow port three (13) communicate according to the pressure of the anti-backflow port one (11); the water inlet end (3), the anti-backflow port two (12), the anti-backflow port three (13), the control cavity (5), the guide valve port two (17), the guide valve port three (18), the shut-off port one (19), the shut-off port two (20), and the water outlet end (4) can be sequentially communicated; and the guide valve port one (16) is in communication with the water inlet end (3).

3. The pressure differential regulating valve with emergency shut-off and anti-backflow function according to claim 2, characterized in that, The shut-off reversing valve (9) further comprises a shut-off port three (21); the shut-off port three (21) is in communication with the water outlet end (4); and the shut-off reversing valve (9) selectively makes the shut-off port one (19) and the shut-off port two (20) communicate or shut off according to the pressure of the shut-off port three (21).

4. The pressure differential regulating valve with emergency shut-off and anti-backflow function according to claim 2 or 3, characterized in that, The anti-backflow reversing valve (7) further comprises an anti-backflow port four (14) and an anti-backflow port five (15); the anti-backflow port four (14) is in communication with the water outlet end (4); the anti-backflow reversing valve (7) selectively makes the anti-backflow port three (13) and the anti-backflow port five (15) communicate or shut off according to the pressure of the anti-backflow port four (14); and the anti-backflow port five (15) is in communication with the water outlet end (4).

5. The pressure regulating valve with emergency shut-off and anti-backflow function according to claim 4, characterized in that, The reset reversing valve (8) further comprises a reset port one (29), a reset port two (30), and a reset port three (31), the shutdown reversing valve (9) further comprises a shutdown port four (22), the reset reversing valve (8) further comprises a reset button (32), the reset port three (31) is communicated with the water outlet end (4), the reset reversing valve (8) makes the reset port one (29) and the reset port two (30) closeable according to the pressure of the reset port three (31), the reset button (32) makes the reset port one (29) and the reset port two (30) conductive, the shutdown reversing valve (9) makes the shutdown port four (22) and the shutdown port two (20) selectively conductive or closed according to the pressure of the shutdown port three (21).

6. The pressure differential regulating valve with emergency shut-off and anti-backflow function according to claim 5, characterized in that, The anti-backflow reversing valve (7), the reset reversing valve (8) and the shutdown reversing valve (9) all comprise a reversing valve shell and a reversing valve core, the reversing valve core moves in the reversing valve shell to switch the communication state.

7. The pressure differential regulating valve with emergency shut-off and anti-backflow function according to claim 1, characterized in that, The valve core assembly comprises a valve rod (33) and a valve plate (34), the valve rod (33) is connected with the main valve film (2), and the valve plate (34) is arranged at the part of the valve rod (33) located in the flow cavity (6).

8. The pressure differential regulating valve with emergency shut-off and anti-backflow function according to claim 1, characterized in that, The pressure difference regulating valve further comprises a regulating needle valve (35), and the anti-backflow reversing valve (7) is communicated with the control cavity (5) through the regulating needle valve (35).

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