Pressure reducing valve with downstream pipe burst emergency shut-off function

Abstract

The present invention relates to the field of valve body technology, and proposes a pressure reducing valve with a downstream pipe burst emergency shutoff function, including a pressure reducing valve body, a control diaphragm, a valve stem and a valve plate, an upstream connecting pipeline, a downstream connecting pipeline, a downstream pressure reducing pipeline and a downstream emergency shutoff pipeline, a reset reversing valve, a pressure reducing shutoff control reversing valve and a pressure reducing pilot valve, wherein the reset reversing valve selectively controls the connection and disconnection between the downstream connecting pipeline and the pressure reducing shutoff control reversing valve according to the pressure of the downstream emergency shutoff pipeline, the pressure reducing shutoff control reversing valve selectively controls the connection and disconnection between the reset reversing valve and the downstream pressure reducing pipeline according to the pressure of the downstream emergency shutoff pipeline, and controls the connection and disconnection between the pressure reducing pilot valve and the downstream pressure reducing pipeline, and the pressure reducing pilot valve controls the opening between the downstream connecting pipeline and the pressure reducing shutoff control reversing valve according to the pressure of the downstream pressure reducing pipeline. Through the above technical scheme, the problem that the traditional pressure reducing valve in the prior art is difficult to deal with the downstream emergency leakage and cannot be shut down urgently, resulting in waste of water resources, is solved.

Description

Technical Field

[0001] The invention relates to the technical field of valve bodies, and in particular to a pressure reducing valve with a downstream pipe burst emergency shutoff function. Background Art

[0002] In the water supply system, the pressure reducing valve is a key component. Its main function is to reduce the fluid pressure in the pipeline to ensure the safe and stable operation of the system. In the fields of high-rise buildings, industrial production and urban water supply, the demand for pressure reducing valves is particularly urgent. With the acceleration of urbanization and the continuous growth of water supply demand, higher requirements are placed on the performance, reliability and intelligence level of pressure reducing valves.

[0003] Although the technology of pressure reducing valves has made significant progress, there are still some problems in practical applications. For example, when traditional pressure reducing valves discharge a large amount of water in response to emergency leakage downstream, they will continue to supply water, resulting in a large amount of water waste; therefore, how to shut off the emergency leakage of the pressure reducing valve in time is also an urgent problem to be solved. Based on the above problems, there is an urgent need for a valve body that can shut off the emergency leakage of the downstream in time. Summary of the invention

[0004] The present invention provides a pressure reducing valve with a downstream pipe burst emergency shut-off function, which solves the problem in the prior art that traditional pressure reducing valves are difficult to cope with downstream emergency leakage and cannot be shut down urgently, resulting in waste of water resources.

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

[0006] A pressure reducing valve with a downstream pipe burst emergency shutoff function, the pressure reducing valve comprising a pressure reducing valve body, a control diaphragm, a valve stem and a valve plate, the pressure reducing valve body being provided with a valve cavity, the control diaphragm dividing the valve cavity into a control cavity and a flow cavity, the flow cavity being provided with an inlet and an outlet, the valve stem being provided on the control diaphragm, the valve plate being provided on the valve stem, the control diaphragm deforming to drive the valve stem to move so that the valve plate controls the opening and closing of the inlet and the outlet;

[0007] The pressure reducing valve further includes an upstream connecting pipeline, a downstream connecting pipeline, a downstream pressure reducing pipeline and a downstream emergency shut-off pipeline. The pressure reducing valve further includes a reset reversing valve, a pressure reducing shut-off control reversing valve and a pressure reducing pilot valve. The upstream connecting pipeline is used to connect the inlet side with the control chamber. One end of the downstream connecting pipeline is connected to the control chamber, and the other end is connected to both the reset reversing valve and the pressure reducing pilot valve. Both the reset reversing valve and the pressure reducing pilot valve are connected to the pressure reducing shut-off control reversing valve. The pressure reducing shut-off control reversing valve is connected to the downstream pressure reducing pipeline. The downstream emergency shut-off pipeline is connected to the reset reversing valve and the pressure reducing shut-off control reversing valve. The valves are connected, the downstream pressure reducing pipeline and the downstream emergency shut-off pipeline are both connected to the outlet, the reset reversing valve can selectively control the on-off between the downstream connecting pipeline and the pressure reducing shut-off control reversing valve according to the pressure of the downstream emergency shut-off pipeline, the pressure reducing shut-off control reversing valve can selectively control the on-off between the reset reversing valve and the downstream pressure reducing pipeline according to the pressure of the downstream emergency shut-off pipeline, and control the on-off between the pressure reducing pilot valve and the downstream pressure reducing pipeline, and the pressure reducing pilot valve controls the opening between the downstream connecting pipeline and the pressure reducing shut-off control reversing valve according to the pressure of the downstream pressure reducing pipeline.

[0008] The reset reversing valve includes a reset valve body, a reset valve core, a reset spring and a reset button. The reset valve core is movably arranged in the reset valve body to control the on-off between the downstream connecting pipeline and the pressure reducing shut-off control reversing valve. The reset spring is sleeved on the reset button and is located between the reset button and the reset valve body. The reset spring is compressed and acts on the reset button. The reset button is movably arranged on the reset valve body and can act on one end of the reset valve core. The pressure of the downstream emergency shut-off pipeline acts on the other end of the reset valve core and is opposite to the end where the reset button acts.

[0009] The pressure reducing shut-off control reversing valve comprises a reversing valve body, a reversing valve core and a reversing control spring. The reversing valve core is movably arranged in the reversing valve body to control the on-off between the reset reversing valve and the downstream pressure reducing pipeline, and to control the on-off between the pressure reducing pilot valve and the downstream pressure reducing pipeline. The reversing control spring is arranged at one end of the reversing valve core, and the pressure of the downstream emergency shut-off pipeline acts on the other end of the reversing valve core and is opposite to the end on which the reversing control spring acts.

[0010] The pressure reducing shut-off control reversing valve also includes a reversing adjusting rod and a push plate, the push plate is movably arranged in the reversing valve body, the reversing control spring is arranged between the push plate and the reversing valve core, the reversing adjusting rod is threadedly connected to the reversing valve body, the reversing adjusting rod abuts against the push plate and the reversing adjusting rod rotates to adjust the position of the push plate.

[0011] The pressure reducing pilot valve comprises a pilot valve body, a pilot valve diaphragm, a pilot valve spring and a pilot valve core. The pilot valve diaphragm is arranged in the pilot valve body and divides the pilot valve body into a pressure reducing regulating chamber and a pressure reducing circulation chamber. The pilot valve spring is arranged in the pressure reducing regulating chamber and acts on the pilot valve diaphragm. One end of the pressure reducing circulation chamber is connected to the downstream connecting pipeline, and the other end is connected to the pressure reducing shut-off control reversing valve. The pilot valve core is arranged on the pilot valve diaphragm. The pilot valve diaphragm is deformed according to the pressure of the pressure reducing circulation chamber to drive the pilot valve core to control the opening of the connection between the downstream connecting pipeline and the pressure reducing shut-off control reversing valve.

[0012] The pressure reducing pilot valve also includes a pilot valve adjusting rod and a baffle, wherein the pilot valve adjusting rod is threadedly connected to the pilot valve body, the baffle is arranged on the pilot valve adjusting rod, the pilot valve spring is arranged between the baffle and the pilot valve diaphragm to achieve compression, and the pilot valve adjusting rod rotates to adjust the distance between the baffle and the pilot valve diaphragm.

[0013] The pressure reducing valve further comprises a regulating needle valve, and the regulating needle valve is arranged on the upstream connecting pipeline;

[0014] The regulating needle valve comprises a needle valve body and a needle valve core. The needle valve body is embedded in the upstream connecting pipeline. The needle valve core is threadedly connected to the needle valve body. The needle valve core rotates to adjust the connecting opening.

[0015] The working principle and beneficial effects of the present invention are:

[0016] The present invention discloses a pressure reducing valve with a downstream pipe burst emergency shutoff function. The pressure reducing valve is controlled by a pressure reducing shutoff control reversing valve to achieve different connection states, so that it is in different working states. Specifically, the pressure reducing shutoff control reversing valve connects the upstream connecting pipeline to the downstream connecting pipeline, then to the pressure reducing pilot valve, then to the pressure reducing shutoff control reversing valve, and then to the downstream pressure reducing pipeline, so that the pressure reducing valve is in a dynamic pressure reducing state of normal operation. When the downstream of the pressure reducing valve leaks, the pressure reducing shutoff control reversing valve will close any passage from the upstream connecting pipeline to the downstream connecting pipeline and to the downstream pressure reducing pipeline according to the pressure of the downstream emergency shutoff pipeline, so as to achieve the effect of emergency shutoff of the valve plate of the pressure reducing valve. Through the above scheme, the pressure reducing valve can flexibly switch the working state according to the change of the downstream water supply pressure during the application process, which can not only achieve pressure reduction to keep the water supply system stable, but also can be shut down in time to avoid water resource waste when dealing with downstream emergency leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] Figure 1 It is a structural schematic diagram of the initial state of the pressure reducing valve in the present invention;

[0019] Figure 2 It is a structural schematic diagram of the water inlet state of the pressure reducing valve in the present invention;

[0020] Figure 3 It is a structural schematic diagram of the pressure reducing valve in the present invention in a dynamic pressure reducing state;

[0021] Figure 4 It is a structural schematic diagram of the pressure reducing valve in the present invention in an emergency shut-off state;

[0022] Figure 5 for Figure 1 A partial enlarged view of the middle A;

[0023] Figure 6 for Figure 1 A partial enlarged view of point B in the middle;

[0024] Figure 7 for Figure 1 A partial enlarged view of point C in the middle;

[0025] Figure 8 for Figure 1 A partial enlarged view of point D in the middle;

[0026] In the figure: 1, pressure reducing valve body, 2, control diaphragm, 3, valve stem, 4, valve plate, 5, control chamber, 6, flow chamber, 7, inlet, 8, outlet, 9, upstream connecting pipeline, 10, downstream connecting pipeline, 11, downstream pressure reducing pipeline, 12, downstream emergency shut-off pipeline, 13, reset reversing valve, 14, pressure reducing shut-off control reversing valve, 15, pressure reducing pilot valve, 16, reset valve body, 17, reset valve core, 18, reset valve 1. Position spring, 19. Reset button, 20. Reversing valve body, 21. Reversing valve core, 22. Reversing control spring, 23. Reversing adjusting rod, 24. Push plate, 25. Pilot valve body, 26. Pilot valve diaphragm, 27. Pilot valve spring, 28. Pilot valve core, 29. Pressure reducing control chamber, 30. Pressure reducing circulation chamber, 31. Pilot valve adjusting rod, 32. Baffle, 33. Adjusting needle valve, 34. Needle valve body, 35. Needle valve core. DETAILED DESCRIPTION

[0027] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] This embodiment proposes a pressure reducing valve with a downstream pipe burst emergency shutoff function, the pressure reducing valve comprises a pressure reducing valve body 1, a control diaphragm 2, a valve stem 3 and a valve plate 4, the pressure reducing valve body 1 is provided with a valve cavity, the control diaphragm 2 divides the valve cavity into a control cavity 5 and a flow cavity 6, the flow cavity 6 is provided with an inlet 7 and an outlet 8, the valve stem 3 is arranged on the control diaphragm 2, the valve plate 4 is arranged on the valve stem 3, the control diaphragm 2 is deformed to drive the valve stem 3 to move so that the valve plate 4 controls the opening and closing of the inlet 7 and the outlet 8;

[0029] The pressure reducing valve further includes an upstream connecting pipeline 9, a downstream connecting pipeline 10, a downstream pressure reducing pipeline 11 and a downstream emergency shut-off pipeline 12. The pressure reducing valve further includes a reset reversing valve 13, a pressure reducing shut-off control reversing valve 14 and a pressure reducing pilot valve 15. The upstream connecting pipeline 9 is used to connect the inlet 7 side with the control chamber 5. One end of the downstream connecting pipeline 10 is connected to the control chamber 5, and the other end is connected to the reset reversing valve 13 and the pressure reducing pilot valve 15. The reset reversing valve 13 and the pressure reducing pilot valve 15 are both connected to the pressure reducing shut-off control reversing valve 14. The pressure reducing shut-off control reversing valve 14 is connected to the downstream pressure reducing pipeline 11. The downstream emergency shut-off pipeline 12 is connected to the reset reversing valve 13 and the pressure reducing shut-off control reversing valve 14. The downstream pressure reducing pipeline 11 and the downstream emergency shut-off pipeline 12 are both connected to the outlet 8. The reset reversing valve 13 can selectively control the on-off between the downstream communicating pipeline 10 and the pressure reducing shut-off control reversing valve 14 according to the pressure of the downstream emergency shut-off pipeline 12. The pressure reducing shut-off control reversing valve 14 can selectively control the on-off between the reset reversing valve 13 and the downstream pressure reducing pipeline 11 according to the pressure of the downstream emergency shut-off pipeline 12, and control the on-off between the pressure reducing pilot valve 15 and the downstream pressure reducing pipeline 11. The pressure reducing pilot valve 15 controls the opening between the downstream communicating pipeline 10 and the pressure reducing shut-off control reversing valve 14 according to the pressure of the downstream pressure reducing pipeline 11.

[0030] In this embodiment, see the attached Figure 1 The pressure reducing valve of this embodiment is mainly composed of a pressure reducing valve body 1, a control diaphragm 2, a valve stem 3 and a valve plate 4. The control diaphragm 2 divides the valve cavity in the pressure reducing valve body 1 into a control cavity 5 and a flow cavity 6. The inlet 7 and the outlet 8 of the flow cavity 6 are the upstream and the downstream of the water supply. The control diaphragm 2 will deform according to the pressure difference between the control cavity 5 and the flow cavity 6, thereby driving the valve stem 3 to move, and then driving the valve plate 4 to move. A connecting structure is arranged in the flow cavity 6 to cooperate with the valve plate 4. When the valve plate 4 abuts against the corresponding structure, the flow cavity 6 is closed. When the control diaphragm 2 moves and drives the valve plate 4 to move, the flow cavity 6 will be opened and a certain opening will be formed. The above is the internal structure of the pressure reducing valve.

[0031] Furthermore, the pressure reducing valve is also provided with a bypass system so that the pressure reducing valve gradually changes from the initial water supply state to the normal water supply state of the upstream and downstream of the pressure reducing valve, and enters the dynamic pressure reducing working state as the pressure reducing valve supplies water, and how the pressure reducing valve enters the feed shut-off state if a leak occurs downstream. Figure 1, the bypass system of the pressure reducing valve is explained. Specifically, one end of the upstream connecting pipeline 9 is connected to the inlet 7 of the pressure reducing valve, and the other end is connected to the control chamber 5 of the pressure reducing valve. One end of the downstream connecting pipeline 10 is connected to the control chamber 5 of the pressure reducing valve, and the other end is divided into two branches, one of which is connected to the reset reversing valve 13, and the other branch is connected to the pressure reducing pilot valve 15. The outlet 8 ends of the reset reversing valve 13 and the pressure reducing pilot valve 15 are both connected to the pressure reducing shut-off control reversing valve 14, and the outlet 8 end of the pressure reducing shut-off control reversing valve 14 is connected to the downstream pressure reducing pipeline 11. The pressure reducing shut-off control reversing valve 14 can make the downstream pressure reducing pipeline 11 connected to the outlet 8 end of one of the reset reversing valve 13 and the pressure reducing pilot valve 15 by adjusting its connection state. At the same time, the reset reversing valve 13 can also make the downstream connecting pipeline 10 connected to or shut off the pressure reducing shut-off control reversing valve 14 by adjusting its connection state. The reset reversing valve 13 and the pressure reducing shut-off control reversing valve 14 are connected to the downstream emergency shut-off pipeline 12 , and the two switch the connection state according to the pressure of the downstream emergency shut-off pipeline 12 .

[0032] According to the above structural description, the following describes the different working states of the pressure reducing valve. First, refer to the attached Figures 1 to 3; At this time, the pressure reducing valve is in the initial state, the upstream is connected to the water supply source, the downstream is the water use end and water has not yet been passed, the upstream water supply, the water pressure of the inlet 7 will enter the control chamber 5 through the upstream connecting pipe 9, and the pressure in the control chamber 5 is the same as the water pressure on the inlet 7 side, but at this time the water pressure in the control chamber 5 acts on the control diaphragm 2, and the water pressure on the inlet 7 side acts on the valve plate 4. The area of ​​the control diaphragm 2 is larger than the area of ​​the valve plate 4, so the pressure reducing valve is in the closed state, and the water in the control chamber 5 will enter the downstream connecting pipe 10. In the initial state, the pressure reducing shut-off control reversing valve 14 is connected to the reset reversing valve 13 and is shut off from the pressure reducing pilot valve 15. Therefore, the water in the control chamber 5 enters the pressure reducing shut-off control reversing valve 14 through the reset reversing valve 13 and enters the downstream pressure reducing pipe 11, and finally enters the outlet 8 side. As the water pressure on the outlet 8 side increases, the water pressure in the control chamber 5 decreases, and the pressure on the valve plate 4 side does not change much from the initial value. At this time, the control The diaphragm 2 is deformed, driving the valve plate 4 to open, and the flow chamber 6 of the pressure reducing valve is connected to realize the state of slow water supply from the inlet 7 to the outlet 8. With the water supply, the pressure on the outlet 8 side rises, and the water will enter the downstream emergency shut-off pipeline 12 and increase its internal pressure. The downstream emergency shut-off pipeline 12 is connected to the reset reversing valve 13 and the pressure reducing shut-off control reversing valve 14, and as the pressure of the downstream emergency shut-off pipeline 12 increases, the reset reversing valve 13 adjusts its connection state to shut off the downstream connecting pipeline 10 and the pressure reducing shut-off control reversing valve 14. At the same time, the pressure reducing shut-off control reversing valve 14 adjusts its connection state as the pressure of the downstream emergency shut-off pipeline 12 increases, so that the pressure reducing pilot valve 15 is connected with the downstream pressure reducing pipeline 11. Then, the downstream connecting pipeline 10 is connected with the downstream pressure reducing pipeline 11 by means of the pressure reducing pilot valve 15 and the pressure reducing shut-off control reversing valve 14. At this time, the pressure reducing valve also transitions from the initial state to the water supply state and enters the dynamic pressure reducing state.

[0033] Further, when the pressure reducing valve is in a dynamic pressure reducing state, the pressure reducing valve is in a normal water supply state. For example, when the water consumption on the outlet 8 side is large, its pressure is reduced. At this time, the pressure in the downstream pressure reducing pipeline 11 is transmitted to the pressure reducing pilot valve 15. The pressure reducing pilot valve 15 controls the opening between the downstream connecting pipeline 10 and the pressure reducing shut-off control reversing valve 14 according to the pressure of the downstream pressure reducing pipeline 11. That is, when the pressure of the downstream pressure reducing pipeline 11 decreases, the opening of the pressure reducing pilot valve 15 increases, and more water in the control chamber 5 is diverted to the pressure reducing pilot valve 15. Until the outlet 8 side, the control diaphragm 2 is deformed to make the valve plate 4 expand the opening of the flow chamber 6, so that the inlet 7 side increases the water supply to the outlet 8 side, maintaining the system pressure stable; on the contrary, when the pressure on the outlet 8 side is relatively stable, the pressure reducing pilot valve 15 will reduce the opening and maintain a stable opening value, and only a small part of the water in the control chamber 5 will be diverted to the pressure reducing pilot valve 15 until the outlet 8 side, so that the water pressure in the control chamber 5 is balanced with the pressure on the valve plate 4 in the flow chamber 6, and the inlet 7 side reduces the water supply to the outlet 8 side. If the pressure on the outlet 8 side increases, the pressure reducing pilot valve 15 is closed, the pressure in the control chamber 5 increases, the valve plate 4 of the pressure reducing valve is closed, and the flow chamber 6 is closed.

[0034] For further information, see Figure 4 When leakage occurs on the outlet 8 side of the pressure reducing valve, the pressure reducing valve needs to be shut down urgently to avoid wasting water resources. For example, when leakage occurs on the outlet 8 side, the pressure in the downstream pressure reducing pipeline 11 drops. At this time, the pressure reducing pilot valve 15 increases its opening, and more water in the control chamber 5 is diverted to the outlet 8 side. At this time, the pressure loss in the control chamber 5 is large, the control diaphragm 2 is deformed greatly, and the valve plate 4 is opened more. At this time, a large amount of water will flow from the inlet 7 side of the pressure reducing valve to the outlet 8 side. At this time, the port of the downstream emergency shut-off pipeline 12 close to the outlet 8 side is closed due to As the water flow rate increases, due to the "water flow ejection principle" of the water flow, the port pressure value of the downstream emergency shut-off pipeline 12 near the outlet 8 side drops to 0. Due to the sudden drop in pressure of the downstream emergency shut-off pipeline 12, the connection state of the pressure reducing shut-off control reversing valve 14 changes, causing the pressure reducing pilot valve 15 to be disconnected from the downstream pressure reducing pipeline 11. Then, the water in the control chamber 5 is no longer diverted, and the pressure inside the control chamber 5 rises rapidly, causing the control diaphragm 2 to deform, driving the valve stem 3 to move and causing the valve plate 4 to shut off the flow chamber 6, thereby shutting off the pressure reducing valve as a whole to avoid wasting water resources. When the leakage problem on the outlet 8 side is solved and the water supply needs to be restored, it is only necessary to adjust the on-off state of the reset reversing valve 13 so that the downstream connecting pipeline 10 and the pressure reducing shut-off control reversing valve 14 are connected, and automatic water supply can be realized.

[0035] The reset reversing valve 13 includes a reset valve body 16, a reset valve core 17, a reset spring 18 and a reset button 19. The reset valve core 17 is movably arranged in the reset valve body 16 to control the on-off between the downstream connecting pipeline 10 and the pressure reducing shut-off control reversing valve 14. The reset spring 18 is sleeved on the reset button 19 and is located between the reset button 19 and the reset valve body 16. The reset spring 18 compresses and acts on the reset button 19. The reset button 19 is movably arranged on the reset valve body 16 and can act on one end of the reset valve core 17. The pressure of the downstream emergency shut-off pipeline 12 acts on the other end of the reset valve core 17 and is opposite to the end on which the reset button 19 acts.

[0036] In this embodiment, refer to Figure 5 Specifically, the structure of the reset reversing valve 13 is as follows: a movable reset valve core 17 is installed in the reset valve body 16; an opening is provided on the reset valve body 16 for connecting a pipeline, which is respectively connected to the downstream connecting pipeline 10 and the pressure reducing shut-off control reversing valve 14; the reset valve core 17 moves to different positions to control the on-off between the downstream connecting pipeline 10 and the pressure reducing shut-off control reversing valve 14; the two ends of the reset valve core 17 are respectively a reset button 19 and a downstream emergency shut-off pipeline 12; when in the initial state, the downstream emergency shut-off pipeline 12 has no pressure, and the water in the downstream connecting pipeline 10 gives pressure to the reset valve core 17 to make it move and connect with the pressure reducing shut-off control reversing valve 14; Valve 14 is connected; when water is supplied normally and the pressure reducing valve is in dynamic pressure reducing, the pressure of the downstream emergency shut-off pipeline 12 increases, pushing the reset valve core 17 to move until the downstream connecting pipeline 10 is shut off from the pressure reducing shut-off control reversing valve 14; when the pressure reducing valve is urgently shut off due to leakage on the outlet 8 side and needs to be reset and restored, press the reset button 19 to make it abut against the reset valve core 17 and adjust its position, so that the downstream connecting pipeline 10 is connected to the pressure reducing shut-off control reversing valve 14 to perform the initial recovery action of the pressure reducing valve, and the reset spring 18 is sleeved on the reset button 19. After the reset button 19 is pressed, the position is restored under the action of the reset spring 18.

[0037] The pressure reducing shut-off control reversing valve 14 includes a reversing valve body 20, a reversing valve core 21 and a reversing control spring 22. The reversing valve core 21 is movably arranged in the reversing valve body 20 to control the on-off between the reset reversing valve 13 and the downstream pressure reducing pipeline 11, and to control the on-off between the pressure reducing pilot valve 15 and the downstream pressure reducing pipeline 11. The reversing control spring 22 is arranged at one end of the reversing valve core 21, and the pressure of the downstream emergency shut-off pipeline 12 acts on the other end of the reversing valve core 21 and is opposite to the end on which the reversing control spring 22 acts.

[0038] In this embodiment, refer to Figure 6The pressure reducing shut-off control reversing valve 14 is specifically a reversing valve core 21 which can be moved is arranged in the reversing valve body 20. The reversing valve body 20 is provided with an opening for connecting various pipelines. The reversing valve body 20 is connected to both the reset reversing valve 13 and the pressure reducing pilot valve 15, and is also connected to the downstream pressure reducing pipeline 11. When the reversing valve core 21 moves to different positions, the downstream pressure reducing pipeline 11 is connected to the reset reversing valve 13 or the pressure reducing pilot valve 15 respectively, and the movement of the reversing valve core 21 is based on the pressure in the downstream emergency shut-off pipeline 12. The position changes, wherein the downstream emergency shut-off line 12 acts on one end of the reversing valve core 21, and the reversing control spring 22 acts on the other end of the reversing valve core 21. When the downstream emergency shut-off line 12 rises, the reversing valve core 21 overcomes the elastic force of the reversing control spring 22 to connect the downstream pressure reducing line 11 with the pressure reducing pilot valve 15; when the pressure of the downstream emergency shut-off line 12 decreases, the elastic force of the reversing control spring 22 is greater than the pressure of the downstream emergency shut-off line 12, so that the downstream pressure reducing line 11 is connected with the reset reversing valve 13.

[0039] The pressure reducing shut-off control reversing valve 14 also includes a reversing adjusting rod 23 and a push plate 24. The push plate 24 is movably arranged in the reversing valve body 20. The reversing control spring 22 is arranged between the push plate 24 and the reversing valve core 21. The reversing adjusting rod 23 is threadedly connected to the reversing valve body 20. The reversing adjusting rod 23 abuts against the push plate 24 and the reversing adjusting rod 23 rotates to adjust the position of the push plate 24.

[0040] On the basis of the above embodiment, an adjusting rod and a push plate 24 can also be provided to adjust the elastic force of the reversing control spring 22. By rotating the reversing adjusting rod 23, the position of the push plate 24 can be adjusted, thereby adjusting the compression amount of the reversing control spring 22. The reversing sensitivity of the pressure reducing shut-off control reversing valve 14 can be adjusted through the above structure.

[0041] The pressure reducing pilot valve 15 includes a pilot valve body 25, a pilot valve diaphragm 26, a pilot valve spring 27 and a pilot valve core 28. The pilot valve diaphragm 26 is arranged in the pilot valve body 25 and divides the pilot valve body 25 into a pressure reducing regulating chamber 29 and a pressure reducing circulation chamber 30. The pilot valve spring 27 is arranged in the pressure reducing regulating chamber 29 and acts on the pilot valve diaphragm 26. One end of the pressure reducing circulation chamber 30 is communicated with the downstream connecting pipeline 10, and the other end is connected to the pressure reducing shut-off control reversing valve 14. The pilot valve core 28 is arranged on the pilot valve diaphragm 26. The pilot valve diaphragm 26 drives the pilot valve core 28 to control the opening of the connection between the downstream connecting pipeline 10 and the pressure reducing shut-off control reversing valve 14 according to the pressure deformation of the pressure reducing circulation chamber 30.

[0042] In this embodiment, refer to Figure 7Specifically, the pressure reducing pilot valve 15 has a pilot valve diaphragm 26 installed in the pilot valve body 25. The pilot valve diaphragm 26 divides the pilot valve body into a pressure reducing regulating chamber 29 and a pressure reducing circulation chamber 30. A pilot valve spring 27 is arranged in the pressure reducing regulating chamber 29. The pressure reducing circulation chamber 30 is used to connect the downstream connecting pipeline 10 and the pressure reducing shut-off control reversing valve 14, and is also indirectly connected to the downstream pressure reducing pipeline 11. During dynamic pressure reduction, the pilot valve spring 27 provides a pressure reducing preset value. The pressure on the outlet 8 side is compared with the pressure reducing preset value of the pilot valve spring 27 after passing through the downstream pressure reducing pipeline 11 and the pressure reducing shut-off control reversing valve 14, thereby causing the pilot valve diaphragm 26 to deform accordingly. For example, when the pressure on the outlet 8 side is less than the pressure reducing preset value of the pilot valve spring 27, the deformation of the pilot valve diaphragm 26 drives the pilot valve core 28 to move and increase the opening; otherwise, the opening is reduced.

[0043] The pressure reducing pilot valve 15 also includes a pilot valve adjusting rod 31 and a baffle 32. The pilot valve adjusting rod 31 is threadedly connected to the pilot valve body 25. The baffle 32 is arranged on the pilot valve adjusting rod 31. The pilot valve spring 27 is arranged between the baffle 32 and the pilot valve diaphragm 26 to achieve compression. The pilot valve adjusting rod 31 is rotated to adjust the distance between the baffle 32 and the pilot valve diaphragm 26.

[0044] On the basis of the above-mentioned embodiment, a pilot valve adjusting rod 31 and a baffle 32 can also be provided to adjust the compression amount of the pilot valve spring 27 and thereby adjust the pressure relief preset value of the pilot valve spring 27. For example, by rotating the pilot valve adjusting rod 31, the baffle 32 is reduced in distance from the pilot valve diaphragm 26, and the pilot valve spring 27 is compressed, then the pressure relief preset value of the pilot valve spring 27 increases, and vice versa, it decreases, thereby improving the flexibility of pressure relief.

[0045] The pressure reducing valve further comprises a regulating needle valve 33, and the regulating needle valve 33 is arranged on the upstream connecting pipeline 9;

[0046] The regulating needle valve 33 includes a needle valve body 34 and a needle valve core 35. The needle valve body 34 is embedded in the upstream connecting pipeline 9. The needle valve core 35 is threadedly connected to the needle valve body 34. The needle valve core 35 rotates to adjust the connecting opening.

[0047] In this embodiment, refer to Figure 8 A regulating needle valve 33 is also provided in the upstream connecting pipeline 9. The regulating needle valve 33 can control the opening of the water flowing in the lateral control chamber 5 of the inlet 7, thereby controlling the flow rate of the diversion. Specifically, a needle valve core 35 is provided in the needle valve body 34 of the regulating needle valve 33. The needle valve core 35 can adjust the opening by rotation. Exemplarily, the end of the needle valve core 35 is conical, and the channel of the needle valve body cooperates with the conical needle valve core 35. By adjusting the position of the needle valve core 35, its opening can be adjusted.

[0048] The above are only 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 in the protection scope of the present invention.

Claims

1. A pressure reducing valve with a downstream pipe burst emergency shutoff function, characterized in that: The pressure reducing valve comprises a pressure reducing valve body (1), a control diaphragm (2), a valve stem (3) and a valve plate (4); the pressure reducing valve body (1) is provided with a valve cavity; the control diaphragm (2) divides the valve cavity into a control cavity (5) and a flow cavity (6); the flow cavity (6) is provided with an inlet (7) and an outlet (8); the valve stem (3) is arranged on the control diaphragm (2); the valve plate (4) is arranged on the valve stem (3); the control diaphragm (2) deforms to drive the valve stem (3) to move so that the valve plate (4) controls the opening and closing of the inlet (7) and the outlet (8); The pressure reducing valve further comprises an upstream connecting pipeline (9), a downstream connecting pipeline (10), a downstream pressure reducing pipeline (11) and a downstream emergency shut-off pipeline (12). The pressure reducing valve further comprises a reset reversing valve (13), a pressure reducing shut-off control reversing valve (14) and a pressure reducing pilot valve (15). The upstream connecting pipeline (9) is used to connect the inlet (7) side with the control chamber (5). One end of the downstream connecting pipeline (10) is connected to the control chamber (5), and the other end is connected to both the reset reversing valve (13) and the pressure reducing pilot valve (15). Both the reset reversing valve (13) and the pressure reducing pilot valve (15) are connected to the pressure reducing shut-off control reversing valve (14). The pressure reducing shut-off control reversing valve (14) is connected to the downstream pressure reducing pipeline (11). The downstream emergency shut-off pipeline (12) is connected to the reset reversing valve (13) and the pressure reducing shut-off control reversing valve (14). The control reversing valve (14) is connected to the downstream pressure reducing pipeline (11) and the downstream emergency shut-off pipeline (12). The reset reversing valve (13) can selectively control the connection and disconnection between the downstream connecting pipeline (10) and the pressure reducing shut-off control reversing valve (14) according to the pressure of the downstream emergency shut-off pipeline (12). The pressure reducing shut-off control reversing valve (14) can selectively control the connection and disconnection between the reset reversing valve (13) and the downstream pressure reducing pipeline (11) according to the pressure of the downstream emergency shut-off pipeline (12), and control the connection and disconnection between the pressure reducing pilot valve (15) and the downstream pressure reducing pipeline (11). The pressure reducing pilot valve (15) controls the opening between the downstream connecting pipeline (10) and the pressure reducing shut-off control reversing valve (14) according to the pressure of the downstream pressure reducing pipeline (11).

2. The pressure reducing valve with downstream pipe burst emergency shutoff function according to claim 1, characterized in that: The reset reversing valve (13) comprises a reset valve body (16), a reset valve core (17), a reset spring (18) and a reset button (19); the reset valve core (17) is movably arranged in the reset valve body (16) to control the on-off between the downstream connecting pipeline (10) and the pressure reducing shut-off control reversing valve (14); the reset spring (18) is sleeved on the reset button (19) and is located between the reset button (19) and the reset valve body (16); the reset spring (18) compresses and acts on the reset button (19); the reset button (19) is movably arranged on the reset valve body (16) and can act on one end of the reset valve core (17); the pressure of the downstream emergency shut-off pipeline (12) acts on the other end of the reset valve core (17) and is opposite to the end on which the reset button (19) acts.

3. The pressure reducing valve with downstream pipe burst emergency shutoff function according to claim 1, characterized in that: The pressure reducing shut-off control reversing valve (14) comprises a reversing valve body (20), a reversing valve core (21) and a reversing control spring (22). The reversing valve core (21) is movably arranged in the reversing valve body (20) to control the on-off between the reset reversing valve (13) and the downstream pressure reducing pipeline (11), and to control the on-off between the pressure reducing pilot valve (15) and the downstream pressure reducing pipeline (11). The reversing control spring (22) is arranged at one end of the reversing valve core (21), and the pressure of the downstream emergency shut-off pipeline (12) acts on the other end of the reversing valve core (21) and is opposite to the end on which the reversing control spring (22) acts.

4. The pressure reducing valve with downstream pipe burst emergency shutoff function according to claim 3, characterized in that: The pressure reducing shut-off control reversing valve (14) further comprises a reversing adjusting rod (23) and a push plate (24), wherein the push plate (24) is movably arranged in the reversing valve body (20), the reversing control spring (22) is arranged between the push plate (24) and the reversing valve core (21), the reversing adjusting rod (23) is threadedly connected to the reversing valve body (20), the reversing adjusting rod (23) abuts against the push plate (24) and the reversing adjusting rod (23) rotates to adjust the position of the push plate (24).

5. The pressure reducing valve with downstream pipe burst emergency shutoff function according to claim 1, characterized in that: The pressure reducing pilot valve (15) comprises a pilot valve body (25), a pilot valve diaphragm (26), a pilot valve spring (27) and a pilot valve core (28); the pilot valve diaphragm (26) is arranged in the pilot valve body (25) and divides the pilot valve body (25) into a pressure reducing regulating chamber (29) and a pressure reducing circulation chamber (30); the pilot valve spring (27) is arranged in the pressure reducing regulating chamber (29) and acts on the pilot valve diaphragm (26); one end of the pressure reducing circulation chamber (30) is communicated with the downstream connecting pipeline (10) and the other end is connected to the pressure reducing shut-off control reversing valve (14); the pilot valve core (28) is arranged on the pilot valve diaphragm (26); the pilot valve diaphragm (26) is deformed according to the pressure of the pressure reducing circulation chamber (30) to drive the pilot valve core (28) to control the opening of the connection between the downstream connecting pipeline (10) and the pressure reducing shut-off control reversing valve (14).

6. The pressure reducing valve with downstream pipe burst emergency shutoff function according to claim 5, characterized in that: The pressure reducing pilot valve (15) further comprises a pilot valve adjusting rod (31) and a baffle (32), wherein the pilot valve adjusting rod (31) is threadedly connected to the pilot valve body (25), the baffle (32) is arranged on the pilot valve adjusting rod (31), the pilot valve spring (27) is arranged between the baffle (32) and the pilot valve diaphragm (26) to achieve compression, and the pilot valve adjusting rod (31) is rotated to adjust the distance between the baffle (32) and the pilot valve diaphragm (26).

7. The pressure reducing valve with downstream pipe burst emergency shutoff function according to claim 1, characterized in that: The pressure reducing valve further comprises a regulating needle valve (33), wherein the regulating needle valve (33) is arranged on the upstream connecting pipeline (9); The regulating needle valve (33) comprises a needle valve body (34) and a needle valve core (35); the needle valve body (34) is embedded in the upstream connecting pipeline (9); the needle valve core (35) is threadedly connected to the needle valve body (34); the needle valve core (35) rotates to adjust the connecting opening.

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