Fire-fighting pipeline linear adjusting pressure release valve and method

Abstract

The invention relates to the technical field of pressure release valves, in particular to a fire-fighting pipeline linear adjusting pressure release valve and a method, the fire-fighting pipeline linear adjusting pressure release valve comprises a first valve body, and further comprises a third valve body, a second valve body, a third valve core assembly, a second valve core assembly and a third valve core assembly, the second valve body is fixedly connected to the top of the third valve body, and a second valve element assembly is connected to the interior of the second valve body; and the pressure regulating mechanism comprises a pressure assembly communicating with the water outlet end of the first valve body, and the top of the second valve body is connected with an elastic assembly. By arranging the pressure adjusting mechanism, a traditional single spring adjusting mode is broken through, the water pressure in the sealing cover and the mechanical pressure of the adjusting screw rod and the first spring are superposed to form a composite pressure relief threshold value, and a method for linearly and finely adjusting the pressure relief threshold value is added; incompressibility of a water medium is utilized, instantaneous pressure fluctuation is absorbed, fatigue failure of the spring under high-frequency impact is effectively avoided, and the device is suitable for starting and stopping of a fire pump or scenes where water hammers frequently occur.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure relief valves, and in particular to a linear regulating pressure relief valve for fire protection pipelines and a method thereof. Background Art

[0002] As an indispensable and critical safety device in firefighting pipeline systems, the pressure relief valve's core function is to monitor the fluid pressure inside the pipeline in real time. When the pressure exceeds a preset safety threshold due to the start-up and shutdown of the fire pump, water hammer, or accidental blockage, the valve automatically opens the pressure relief channel and rapidly reduces the pipeline pressure by discharging some fluid in a targeted manner. This avoids the risk of pipeline rupture, interface leakage, or equipment damage caused by overpressure, ensuring the stable operation of the firefighting pipeline during firefighting operations and daily standby, and providing a basic safety guarantee for the reliable startup and efficient operation of the firefighting system. The valve discs of existing pressure relief valves in firefighting pipelines are mostly spring-loaded, making it difficult to determine a specific opening pressure. In actual use, the opening pressure of the pressure relief valve is often unclear, reducing the pressure relief capacity.

[0003] In the existing technology, a gravity-type structure consisting of a frustum-shaped valve disc and a conical connecting section is used. The pressure relief is controlled by balancing the deadweight of the valve disc with the inlet pressure to achieve the function of automatic opening when the pressure exceeds the limit. In this method, a composite pressure relief threshold control cannot be formed, and instantaneous pressure fluctuations cannot be absorbed, which easily affects the pressure relief efficiency and damages the pressure relief valve. A T-type column and a single spring are used to achieve pressure relief. In this method, a single spring threshold control is relied upon, and there is a lack of dynamic adjustment capability. There is no linear adjustment and feedback acceleration mechanism, which is not conducive to improving the pressure relief rate. Summary of the Invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art that it is unable to form a composite pressure relief threshold control and cannot absorb instantaneous pressure fluctuations, which easily affects the pressure relief efficiency and damages the pressure relief valve, and to propose a linear regulation pressure relief valve and method for fire protection pipelines.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A linear regulating pressure relief valve for a fire protection pipeline comprises a first valve body and further comprises:

[0007] a third valve body, the third valve body being connected to the water outlet end of the first valve body and internally connected to the first valve core assembly;

[0008] The second valve body is fixedly connected to the top of the third valve body and is internally connected to a second valve core assembly;

[0009] The pressure regulating mechanism includes a pressure component connected to the water outlet end of the first valve body, an elastic component connected to the top of the second valve body, the pressure component is connected to the elastic component, the elastic component is connected to the second valve core component, the water inlet end of the second valve core component is connected to the water inlet end of the third valve body, and the water outlet end is connected to the piston component, the output end of the piston assembly is connected to the first valve core assembly, when the water pressure at the water inlet end of the third valve body is greater than the sum of the threshold pressures of the pressure component and the elastic component, the second valve core assembly is connected to its water inlet and water outlet, and the output end of the piston assembly is moved, driving the first valve core assembly to move and connect the water inlet and water outlet of the third valve body;

[0010] A feedback component, wherein the water inlet end of the feedback component is connected to the water outlet end of the third valve body, and the water outlet end is connected to the input end of the piston component through the second valve core component.

[0011] Preferably, the pressure assembly includes a pressure valve and a pressure gauge that are detachably connected to the water outlet end of the first valve body. The pressure gauge is used to detect and display the water pressure at the water outlet end of the pressure valve. The detection end of the pressure gauge is connected to a pressure tube. The end of the pressure tube away from the pressure gauge is connected to the elastic assembly. A solenoid valve is installed inside the pressure tube. The pressure gauge and the solenoid valve are both electrically connected to a controller. The controller is installed on the first valve body. The controller receives the signal from the pressure gauge and controls the solenoid valve to close when the water pressure reaches the threshold pressure of the pressure valve.

[0012] Preferably, the water inlet end of the first valve body is detachably connected to a filter, and the water inlet end of the first valve body is sealed and connected to a detachable filter element cover and a fixed cover. The filter can be removed from the interior of the first valve body after the filter element cover is removed and the pressure valve can be removed from the interior of the first valve body after the fixed cover is removed. The filter, pressure valve and pressure gauge are connected in sequence between the water inlet end and the water outlet end of the first valve body.

[0013] Preferably, the elastic component includes a sealing cover fixedly connected to the top of the second valve body, the end of the pressure tube away from the pressure gauge is connected to the sealing cover, the top of the sealing cover is sealingly threadedly connected to an adjusting screw and clamped with a protective cover, the top of the adjusting screw is located inside the protective cover, the bottom end extends into the interior of the sealing cover and is rotatably connected to an upper spring cover, the upper spring cover is sealingly and slidingly connected to the inner top of the sealing cover, and the bottom is fixedly connected to a first spring, the bottom end of the first spring is fixedly connected to a rubber plug, the rubber plug sealingly slides on the inner bottom of the sealing cover, a first adjusting chamber is opened at the top of the second valve body, a sealing diaphragm is fixedly connected to the inside of the first adjusting chamber, the rubber plug is pressed against the second valve core assembly through the sealing diaphragm, and a second channel is connected between the first adjusting chamber and the water inlet end of the third valve body.

[0014] Preferably, the second valve core assembly includes a first valve seat installed inside the second valve body, a first valve stem is slidably installed inside the first valve seat, the bottom end of the first valve stem is fixedly connected to the second spring, and the top end rests on the sealing diaphragm under the rubber stopper, the top end of the first valve seat is connected to the first regulating chamber, the side is connected to the second regulating chamber, and the bottom end is connected to the third regulating chamber, the bottom end of the second spring is fixedly connected to the inner bottom of the third regulating chamber, the second regulating chamber and the third regulating chamber are both opened inside the second valve body, and a first channel is connected between the second regulating chamber and the input end of the piston assembly. When the water pressure at the water inlet end of the third valve body is greater than the sum of the threshold pressure of the pressure valve and the elastic force of the first spring, the first valve stem moves downward to the lower limit position, so that the first valve seat connects the first regulating chamber and the second regulating chamber and closes the third regulating chamber.

[0015] Preferably, the piston assembly includes a piston chamber opened at the top of the third valve body, the top of the piston chamber is communicated with the first channel, a sealing piston is internally sealed and slidably connected thereto, and the bottom of the sealing piston is connected to the first valve core assembly.

[0016] Preferably, the first valve core assembly includes a second valve seat installed inside the third valve body, a second valve stem is slidably installed inside the second valve seat, the top seal of the second valve stem extends into the interior of the piston cavity and is fixedly connected to the bottom of the sealing piston, the bottom end is fixedly connected to a third spring, the bottom end of the third spring is fixedly connected to a base, the base seal is fixedly connected to the bottom of the third valve body, when the sealing piston moves downward, it pushes the second valve stem to make the second valve seat connect the water inlet and outlet ends of the third valve body.

[0017] Preferably, the feedback assembly includes a third channel connected between the water outlet end of the third valve body and the third regulating chamber. When the first valve stem moves upward from the lower limit position, the first valve seat connects the third regulating chamber and the second regulating chamber and closes the first regulating chamber.

[0018] Preferably, a filter cavity connected in series in the third channel is provided inside the second valve body, and a filter cartridge is installed inside the filter cavity, and the filter cartridge is used to filter the fluid flowing through the third channel.

[0019] A fire pipeline linear regulation pressure relief method includes the fire pipeline linear regulation pressure relief valve mentioned above, and further includes the following steps:

[0020] S1, filtered water, water flows through the filter inside the first valve body and enters the pressure valve, the pressure gauge monitors the water pressure;

[0021] S2: The pressure reaches the threshold pressure of the pressure valve and then enters the third valve body. The solenoid valve closes to maintain the pressure of the water inside the sealing cover.

[0022] S3, triggering pressure relief, water enters the first regulating chamber. When the water pressure exceeds the sum of the water pressure inside the sealing cover and the elastic force of the second spring, the water lifts up the sealing diaphragm and presses down the first valve stem;

[0023] S4, open the pressure relief, the first valve stem moves down, water enters the piston chamber, the sealing piston and the second valve stem move down, the second valve seat is connected, and the pressure is relieved and the water is drained;

[0024] S5, accelerating pressure relief, the pressure relief water flows back through the third channel, accelerating the downward movement of the sealing piston, and increasing the flow diameter of the second valve seat 26;

[0025] S6. Reset is completed, the water pressure drops, and the spring drives each component to reset.

[0026] Compared with the prior art, the advantages of the present invention are:

[0027] 1. The present invention breaks through the traditional single spring adjustment mode by setting a pressure regulating mechanism, superimposes the water pressure inside the sealing cover with the mechanical pressure of the adjusting screw and the first spring to form a composite pressure relief threshold, and adds a method for linear fine-tuning the pressure relief threshold; utilizes the incompressibility of the water medium to absorb instantaneous pressure fluctuations, effectively avoiding fatigue failure of the spring under high-frequency impact, and is suitable for scenarios where fire pumps are started and stopped or water hammers often occur; a phased response mechanism is formed by three springs, the first spring cooperates with the water inside the sealing cover to accurately control the starting point of the pressure relief threshold, the second spring controls the movement of the first valve stem to smoothly connect the opening and closing processes, and the third spring controls the movement of the second valve stem to perform large-flow pressure relief through the second valve seat; the multi-spring redundant design disperses mechanical stress, and combined with the gradual downward movement of the sealing piston, reduces impact damage to the valve seat, and significantly improves the service life of the pressure relief valve.

[0028] 2. The present invention sets a feedback component. During the pressure relief process, the water at the water outlet end of the third valve body is filtered twice by the filter cartridge, and then enters the piston chamber through the first valve seat, the second regulating chamber, and the first channel, thereby accelerating the downward movement of the sealing piston and realizing a dynamic increase in the pressure relief speed. This effectively avoids the problem of insufficient discharge efficiency of traditional valves and utilizes the outlet water pressure to achieve the effect of positive feedback to accelerate pressure relief.

[0029] 3. The present invention establishes a proportional relationship between the pressure relief volume and the system pressure by setting up a linkage between multiple springs and sealing pistons, thereby solving the nonlinear jump problem of traditional valves in the critical pressure area and is suitable for fire protection pipelines that require continuous pressure regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is an overall axonometric diagram of a linear regulating pressure relief valve for a fire protection pipeline proposed by the present invention.

[0031] Figure 2 This is a structural schematic diagram of the first valve body and pressure gauge of a linear regulating pressure relief valve for a fire protection pipeline proposed by the present invention.

[0032] Figure 3This is a structural schematic diagram of a filter and pressure valve for a linear regulating pressure relief valve for a fire protection pipeline proposed by the present invention.

[0033] Figure 4 This is a schematic diagram of the adjusting screw and first spring structure of a linear regulating pressure relief valve for a fire protection pipeline proposed by the present invention.

[0034] Figure 5 This is a schematic diagram of the filter cartridge and sealing piston structure of a linear regulating pressure relief valve for a fire protection pipeline proposed by the present invention.

[0035] Figure 6 This is a schematic diagram of the half-section structure of the second valve body and the third valve body of a linear regulating pressure relief valve for a fire protection pipeline proposed by the present invention.

[0036] Figure 7 for Figure 6 Schematic diagram of the structure of A in the figure.

[0037] In the figure: 1. first valve body; 2. filter element cover; 3. fixed cover; 4. pressure gauge; 5. filter; 6. pressure valve; 7. pressure tube; 8. protective cover; 9. adjusting screw; 10. sealing cover; 11. upper spring cover; 12. first spring; 13. rubber plug; 14. second valve body; 15. first regulating chamber; 16. sealing diaphragm; 17. first valve seat; 18. first valve stem; 19. second regulating chamber; 20. second spring; 21. first channel; 22. piston chamber; 23. sealing piston; 24. third regulating chamber; 25. second valve stem; 26. second valve seat; 27. third spring; 28. base; 29. ​​third valve body; 30. second channel; 31. third channel; 32. filter cartridge. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0039] Reference Figure 1-Figure 7 A linear regulating pressure relief valve for a fire protection pipeline comprises a first valve body 1 and further comprises:

[0040] The third valve body 29 is connected to the water outlet end of the first valve body 1 and is internally connected to the first valve core assembly.

[0041] The second valve body 14 is fixedly connected to the top of the third valve body 29 and is internally connected to a second valve core assembly.

[0042] The pressure regulating mechanism includes a pressure component connected to the water outlet end of the first valve body 1, an elastic component connected to the top of the second valve body 14, the pressure component is connected to the elastic component, the elastic component is connected to the second valve core component, the water inlet end of the second valve core component is connected to the water inlet end of the third valve body 29, and the water outlet end is connected to the piston component, the output end of the piston assembly is connected to the first valve core assembly, when the water pressure at the water inlet end of the third valve body 29 is greater than the sum of the threshold pressures of the pressure component and the elastic component, the second valve core assembly is connected to its water inlet end and water outlet end, and the output end of the piston assembly is moved, driving the first valve core assembly to move to connect the water inlet end and water outlet end of the third valve body 29.

[0043] The pressure assembly includes a pressure valve 6 and a pressure gauge 4 that are detachably connected to the water outlet end of the first valve body 1. The pressure gauge 4 is used to detect and display the water pressure at the water outlet end of the pressure valve 6. The detection end of the pressure gauge 4 is connected to a pressure pipe 7. The end of the pressure pipe 7 away from the pressure gauge 4 is connected to the elastic assembly. A solenoid valve is installed inside the pressure pipe 7. The pressure gauge 4 and the solenoid valve are both electrically connected to a controller. The controller is installed on the first valve body 1. The controller receives the signal from the pressure gauge 4 and controls the solenoid valve to close when the water pressure reaches the threshold pressure of the pressure valve 6.

[0044] When the controller is working, the water pressure inside the pressure pipe 7 can maintain the threshold pressure of the pressure valve 6, so that this part of the pressure constitutes the subsequent pressure relief threshold pressure. Therefore, by adjusting the threshold pressure of the pressure valve 6, the pressure relief threshold pressure of the entire pressure relief valve can be adjusted, thereby increasing the adjustment method.

[0045] Reference Figure 2 and Figure 3 The water inlet end of the first valve body 1 is detachably connected to a filter 5, and the water inlet end of the first valve body 1 is sealed and connected to a detachable filter element cover 2 and a fixed cover 3. After the filter element cover 2 is removed, the filter 5 and the pressure valve 6 are removed from the inside of the first valve body 1. The filter 5, the pressure valve 6, and the pressure gauge 4 are sequentially connected between the water inlet end and the water outlet end of the first valve body 1.

[0046] When the filter 5 needs to be replaced, the filter 5 is replaced by removing the filter element cover 2 . When the pressure valve 6 needs to be adjusted or replaced, the pressure valve 6 is adjusted or replaced by removing the fixed cover 3 .

[0047] The elastic component includes a sealing cover 10 fixedly connected to the top of the second valve body 14, and the end of the pressure tube 7 away from the pressure gauge 4 is connected to the sealing cover 10. The top of the sealing cover 10 is sealingly threadedly connected with an adjusting screw 9 and a protective cover 8. The top of the adjusting screw 9 is located inside the protective cover 8, and the bottom end extends into the interior of the sealing cover 10 and is rotatably connected to the upper spring cover 11. The upper spring cover 11 is sealingly and slidingly connected to the inner top of the sealing cover 10, and the bottom is fixedly connected to a first spring 12. The bottom end of the first spring 12 is fixedly connected to a rubber plug 13, and the rubber plug 13 sealingly slides on the inner bottom of the sealing cover 10. A first adjusting chamber 15 is opened at the top of the second valve body 14, and a sealing diaphragm 16 is fixedly connected to the inside of the first adjusting chamber 15. The rubber plug 13 rests on the second valve core assembly through the sealing diaphragm 16. A second channel 30 is connected between the first adjusting chamber 15 and the water inlet end of the third valve body 29.

[0048] By rotating the adjusting screw 9 and adjusting the elastic force of the first spring 12, the pressure relief threshold pressure of the entire pressure relief valve can be adjusted, and the threshold pressure adjustment of the pressure valve 6 can be coordinated to form a dual adjustment method.

[0049] The sealing diaphragm 16 adopts the existing technology and is used to seal and separate the water inside the sealing cover 10 and the water inside the first regulating chamber 15, so that the water pressure inside the sealing cover 10 is matched with the elastic force of the first spring 12 to compare with the water pressure inside the first regulating chamber 15, forming a trigger control for pressure relief.

[0050] The second valve core assembly includes a first valve seat 17 installed inside the second valve body 14, and a first valve stem 18 is slidably installed inside the first valve seat 17. The bottom end of the first valve stem 18 is fixedly connected to the second spring 20, and the top end rests on the sealing diaphragm 16 below the rubber stopper 13. The top end of the first valve seat 17 is connected to the first regulating chamber 15, the side is connected to the second regulating chamber 19, and the bottom end is connected to the third regulating chamber 24. The bottom end of the second spring 20 is fixedly connected to the inner bottom of the third regulating chamber 24. The second regulating chamber 19 and the third regulating chamber 24 are both opened inside the second valve body 14. A first channel 21 is connected between the second regulating chamber 19 and the input end of the piston assembly. When the water pressure at the water inlet end of the third valve body 29 is greater than the sum of the threshold pressure of the pressure valve 6 and the elastic force of the first spring 12, the first valve stem 18 moves downward to the lower limit position, causing the first valve seat 17 to connect the first regulating chamber 15 and the second regulating chamber 19 and close the third regulating chamber 24.

[0051] The piston assembly includes a piston chamber 22 opened at the top of the third valve body 29. The top of the piston chamber 22 is communicated with the first channel 21 and is internally sealed and slidably connected to a sealing piston 23. The bottom of the sealing piston 23 is connected to the first valve core assembly.

[0052] By providing a second valve core assembly and a piston assembly, mechanical stress is further dispersed, the impact strength of water on the pressure relief valve is reduced, and the service life of the pressure relief valve is significantly improved.

[0053] The first valve core assembly includes a second valve seat 26 installed inside the third valve body 29, and a second valve stem 25 is slidably installed inside the second valve seat 26. The top end of the second valve stem 25 seals and extends into the interior of the piston cavity 22 and is fixedly connected to the bottom of the sealing piston 23. The bottom end is fixedly connected to a third spring 27, and the bottom end of the third spring 27 is fixedly connected to a base 28. The base 28 is sealed and fixedly connected to the bottom of the third valve body 29. When the sealing piston 23 moves downward, it pushes the second valve stem 25 to make the second valve seat 26 connect the water inlet and water outlet of the third valve body 29.

[0054] When the second valve stem 25 gradually moves downward inside the second valve seat 26, the gap between the two gradually increases, so that the communication diameter between the second valve seat 26 and the water inlet and outlet ends of the third valve body 29 gradually increases, which facilitates increasing the pressure relief rate when the second valve stem 25 continues to move downward.

[0055] Feedback assembly, the water inlet end of the feedback assembly is connected with the water outlet end of the third valve body 29, and the water outlet end is connected with the input end of the piston assembly through the second valve core assembly.

[0056] The feedback component includes a third channel 31 connected between the water outlet end of the third valve body 29 and the third regulating chamber 24. When the first valve stem 18 moves upward from the lower limit position, the first valve seat 17 connects the third regulating chamber 24 and the second regulating chamber 19 and closes the first regulating chamber 15.

[0057] When water enters the water outlet end of the third valve body 29, part of the water eventually flows back into the top of the piston chamber 22 through the third channel 31, continuing to push the sealing piston 23 and the second valve stem 25 downward, increasing the drainage and pressure relief rate through the second valve seat 26.

[0058] A filter chamber connected in series with the third channel 31 is defined inside the second valve body 14 . A filter cartridge 32 is installed inside the filter chamber. The filter cartridge 32 is used to filter the fluid flowing through the third channel 31 .

[0059] The water is filtered twice by the filter cartridge 32 to prevent impurities in the water from affecting the second valve core assembly and the piston assembly.

[0060] A cartridge cover is detachably mounted on the side of the second valve body 14 , and the filter cartridge 32 can be easily cleaned and replaced by removing the cartridge cover.

[0061] When the present invention is used, water enters the first valve body 1 and first contacts the filter 5 inside the first valve body 1, where the water is filtered to prevent blockage in subsequent processes.

[0062] The water then enters the pressure valve 6 which is obliquely inserted into the first valve body 1 , and the water pressure there can be observed through the pressure gauge 4 .

[0063] When the water pressure reaches the threshold pressure set by the pressure valve 6, the pressure valve 6 is turned on and water begins to enter the interior of the third valve body 29. At the same time, the controller receives the signal from the pressure gauge 4 and controls the solenoid valve to close, so that the water pressure inside the pressure tube 7 and the sealing cover 10 maintains the threshold pressure, so that the pressure relief threshold of the entire pressure relief valve is composed of the water pressure inside the sealing cover 10 and the elastic force of the first spring 12.

[0064] Water and the first spring 12 are simultaneously present inside the sealing cover 10. Due to the incompressibility of the water medium, instantaneous pressure fluctuations can be absorbed, effectively preventing fatigue failure of the spring under high-frequency impact, and reducing valve core vibration when the fire pump suddenly starts and stops or water hammer occurs.

[0065] An upper spring cover 11 is provided on the top of the first spring 12 to prevent water from overflowing, and a rubber plug 13 that can be deformed to a certain extent is provided on the bottom.

[0066] By adjusting the threshold pressure of the pressure valve 6, the water pressure inside the sealing cover 10 can be adjusted. By rotating the adjusting screw 9, the elastic force of the first spring 12 can be adjusted. More linear fine-tuning methods are added, and the pressure relief threshold of the entire pressure relief valve can be fine-tuned within the linear range.

[0067] At the same time, the pressure valve 6 and the pressure gauge 4 can provide timely warning of the current water pressure, making it convenient for staff to control the water pressure status.

[0068] After water enters the water inlet end of the third valve body 29, the second valve stem 25 is in a closed state in the second valve seat 26, and water cannot pass through the second valve seat 26. The water at the water inlet end of the third valve body 29 will enter the interior of the first regulating chamber 15 through the second channel 30.

[0069] When the water pressure in the first regulating chamber 15 is greater than the water pressure in the sealing cover 10 and the pressure applied by the first spring 12, that is, when the pressure relief threshold is reached, the sealing diaphragm 16 is lifted up, and at the same time, the first valve stem 18 moves downward to the lower limit position along the inside of the first valve seat 17 under the action of the water pressure. The first valve seat 17 connects the first regulating chamber 15 and the second regulating chamber 19 and closes the third regulating chamber 24. Water enters the inside of the second regulating chamber 19 through the first valve seat 17, and then enters the inside of the piston chamber 22 through the first channel 21, squeezing the sealing piston 23 downward. The sealing piston 23 drives the second valve stem 25 to squeeze the third spring 27 and slowly moves downward in the second valve seat 26, so that the second valve seat 26 connects the water inlet and water outlet of the third valve body 29 to relieve pressure and drain water.

[0070] The water discharged by pressure relief will fill the water outlet end of the third valve body 29 and increase the water pressure inside the limited space. Therefore, during the pressure relief process, the third channel 31 connected to the water outlet begins to take in water, and the water is filtered twice through the filter cartridge 32 before entering the third regulating chamber 24. Due to the continuous pressure relief, the pressure inside the first regulating chamber 15 becomes smaller and smaller. Under the elastic force of the second spring 20, the first valve stem 18 moves upward from the lower limit position, causing the first valve seat 17 to connect the third regulating chamber 24 and the second regulating chamber 19 and close the first regulating chamber 15. The water inside the third regulating chamber 24 passes through the first valve seat 17, the second regulating chamber 19, and the first channel 21 and enters the inner top of the piston chamber 22, continuing to push the sealing piston 23 downward, increasing the speed at which the second valve stem 25 moves downward, increasing the communication diameter of the second valve seat 26, and accelerating the speed of pressure relief. By utilizing the increase in the water outlet pressure, the effect of positive feedback accelerated pressure relief is achieved.

[0071] Finally, the pressure relief is completed and each component returns to its original position under the elastic force of the spring.

[0072] A fire pipeline linear regulation pressure relief method includes the fire pipeline linear regulation pressure relief valve mentioned above, and further includes the following steps:

[0073] S1, filter incoming water, the water flows through the filter 5 inside the first valve body 1, enters the pressure valve 6, and the pressure gauge 4 monitors the water pressure.

[0074] S2, the pressure reaches the threshold pressure of the pressure valve 6 and then enters the third valve body 29, and the solenoid valve is closed to maintain the pressure of the water inside the sealing cover 10.

[0075] S3, triggering pressure relief, water enters the first regulating chamber 15, when the water pressure exceeds the sum of the water pressure inside the sealing cover 10 and the elastic force of the first spring 12, the water lifts up the sealing diaphragm 16 and presses down the first valve stem 18.

[0076] S4. Open the pressure relief, the first valve stem 18 moves downward, water enters the piston chamber 22, the sealing piston 23 and the second valve stem 25 move downward, the second valve seat 26 is connected, and the pressure is relieved and the water is drained.

[0077] S5 , accelerating pressure relief. The pressure relief water flows back through the third channel 31 , accelerating the downward movement of the sealing piston 23 , and maintaining or increasing the flow diameter of the second valve seat 26 .

[0078] S6. Reset is completed, the water pressure drops, and the spring drives each component to reset.

[0079] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A linear regulating pressure relief valve for a fire protection pipeline, comprising a first valve body (1), characterized in that: Also includes: a third valve body (29), the third valve body (29) being connected to the water outlet end of the first valve body (1) and internally connected to the first valve core assembly; a second valve body (14), the second valve body (14) being fixedly connected to the top of the third valve body (29) and internally connected to a second valve core assembly; A pressure regulating mechanism, the pressure regulating mechanism includes a pressure component connected to the water outlet end of the first valve body (1), an elastic component connected to the top of the second valve body (14), the pressure component and the elastic component are connected, the elastic component is connected to the second valve core component, the water inlet end of the second valve core component is connected to the water inlet end of the third valve body (29), and the water outlet end is connected to the piston component, the output end of the piston component is connected to the first valve core component, when the water pressure at the water inlet end of the third valve body (29) is greater than the sum of the threshold pressures of the pressure component and the elastic component, the second valve core component is connected to its water inlet end and water outlet end, and the output end of the piston component is moved, driving the first valve core component to move and connect the water inlet end and water outlet end of the third valve body (29); A feedback component, wherein the water inlet end of the feedback component is connected to the water outlet end of the third valve body (29), and the water outlet end is connected to the input end of the piston component through the second valve core component.

2. The linear regulating pressure relief valve for fire protection pipeline according to claim 1, characterized in that: The pressure assembly comprises a pressure valve (6) and a pressure gauge (4) which are detachably connected to the water outlet end of the first valve body (1). The pressure gauge (4) is used to detect and display the water pressure at the water outlet end of the pressure valve (6). The detection end of the pressure gauge (4) is connected to a pressure pipe (7). The end of the pressure pipe (7) away from the pressure gauge (4) is connected to the elastic assembly. A solenoid valve is installed inside the pressure pipe (7). The pressure gauge (4) and the solenoid valve are both electrically connected to a controller. The controller is installed on the first valve body (1). The controller receives a signal from the pressure gauge (4) and controls the solenoid valve to close when the water pressure reaches a threshold pressure of the pressure valve (6).

3. The linear regulating pressure relief valve for fire protection pipeline according to claim 2, characterized in that: The water inlet end of the first valve body (1) is detachably connected to a filter (5), and the water inlet end of the first valve body (1) is sealed and connected to a detachable filter cover (2) and a fixed cover (3). After the filter cover (2) is disassembled, the filter (5) and the pressure valve (6) are disassembled after the fixed cover (3) are removed. The filter (5), the pressure valve (6), and the pressure gauge (4) are sequentially connected between the water inlet end and the water outlet end of the first valve body (1).

4. The linear regulating pressure relief valve for fire protection pipeline according to claim 3, characterized in that: The elastic component includes a sealing cover (10) fixedly connected to the top of the second valve body (14), the end of the pressure tube (7) away from the pressure gauge (4) is connected to the sealing cover (10), the top of the sealing cover (10) is sealed and threadedly connected to the adjusting screw (9), and is clamped with a protective cover (8), the top of the adjusting screw (9) is located inside the protective cover (8), the bottom end extends into the inside of the sealing cover (10) and is rotatably connected to the upper spring cover (11), the upper spring cover (11) is sealingly slidably connected to the inner top of the sealing cover (10), and the bottom A first spring (12) is fixedly connected, a rubber plug (13) is fixedly connected to the bottom end of the first spring (12), the rubber plug (13) is sealingly slid on the inner bottom of the sealing cover (10), a first regulating chamber (15) is opened on the top of the second valve body (14), a sealing diaphragm (16) is fixedly connected inside the first regulating chamber (15), the rubber plug (13) abuts against the second valve core assembly through the sealing diaphragm (16), and a second channel (30) is connected between the first regulating chamber (15) and the water inlet end of the third valve body (29).

5. The linear regulating pressure relief valve for fire protection pipeline according to claim 4, characterized in that: The second valve core assembly includes a first valve seat (17) installed inside the second valve body (14), a first valve stem (18) is slidably installed inside the first valve seat (17), the bottom end of the first valve stem (18) is fixedly connected to the second spring (20), and the top end abuts against the sealing diaphragm (16) below the rubber plug (13), the top end of the first valve seat (17) is connected to the first regulating chamber (15), the side is connected to the second regulating chamber (19), and the bottom end is connected to the third regulating chamber (24), the bottom end of the second spring (20) is fixedly connected to the third regulating chamber The inner bottom of the valve body (24), the second regulating chamber (19) and the third regulating chamber (24) are both opened inside the second valve body (14), and the second regulating chamber (19) and the input end of the piston assembly are connected by a first channel (21). When the water pressure at the water inlet end of the third valve body (29) is greater than the sum of the threshold pressure of the pressure valve (6) and the elastic force of the first spring (12), the first valve stem (18) moves downward to the lower limit position, so that the first valve seat (17) conducts the first regulating chamber (15) and the second regulating chamber (19) and closes the third regulating chamber (24).

6. The linear regulating pressure relief valve for fire protection pipeline according to claim 5, characterized in that: The piston assembly includes a piston chamber (22) opened at the top of the third valve body (29), the top of the piston chamber (22) is communicated with the first channel (21), the interior of the piston chamber (22) is sealed and slidably connected to a sealing piston (23), and the bottom of the sealing piston (23) is connected to the first valve core assembly.

7. The linear regulating pressure relief valve for fire protection pipeline according to claim 6, characterized in that: The first valve core assembly includes a second valve seat (26) installed inside the third valve body (29), a second valve stem (25) is slidably installed inside the second valve seat (26), the top end of the second valve stem (25) seals and extends into the interior of the piston cavity (22) and is fixedly connected to the bottom of the sealing piston (23), and the bottom end is fixedly connected to a third spring (27), the bottom end of the third spring (27) is fixedly connected to a base (28), and the base (28) is sealed and fixedly connected to the bottom of the third valve body (29). When the sealing piston (23) moves downward, it pushes the second valve stem (25) to make the second valve seat (26) conduct to the water inlet and water outlet of the third valve body (29).

8. The linear regulating pressure relief valve for fire protection pipeline according to claim 7, characterized in that: The feedback assembly includes a third channel (31) connected between the water outlet end of the third valve body (29) and the third regulating chamber (24). When the first valve stem (18) moves upward from the lower limit position, the first valve seat (17) connects the third regulating chamber (24) and the second regulating chamber (19) and closes the first regulating chamber (15).

9. The linear regulating pressure relief valve for fire protection pipeline according to claim 8, characterized in that: A filter chamber connected in series in the third channel (31) is provided inside the second valve body (14), and a filter cartridge (32) is installed inside the filter chamber. The filter cartridge (32) is used to filter the fluid flowing through the third channel (31).

10. A fire protection pipeline linear regulation pressure relief method, characterized in that: The fire protection pipeline linear regulating pressure relief valve according to claim 9 further comprises the following steps: S1, filtered water flows through the filter (5) inside the first valve body (1) and enters the pressure valve (6). The pressure gauge (4) monitors the water pressure; S2, the pressure reaches the threshold pressure of the pressure valve (6) and then enters the third valve body (29), and the solenoid valve is closed to maintain the pressure of the water inside the sealing cover (10); S3, triggering pressure relief, water enters the first regulating chamber (15), and when the water pressure exceeds the sum of the water pressure inside the sealing cover (10) and the elastic force of the first spring (12), the water lifts up the sealing diaphragm (16) and presses down the first valve stem (18); S4, opening the pressure relief, the first valve stem (18) moves downward, water enters the piston chamber (22), causing the sealing piston (23) and the second valve stem (25) to move downward, the second valve seat (26) to be open, and the pressure is relieved and the water is drained; S5, accelerating pressure relief, the pressure relief water flows back through the third channel (31), accelerating the downward movement of the sealing piston (23), and increasing the flow diameter of the second valve seat (26); S6. Reset is completed, the water pressure drops, and the spring drives each component to reset.

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