A straight-through pressure relief valve

Abstract

The present invention belongs to the field of pressure control technology, specifically a straight-through pressure relief valve, including a main valve cylinder, a drainage device is provided on the top of the inner wall of the main valve cylinder, a pressure relief device is provided in the middle of the inner wall of the main valve cylinder, and a drainage device is provided at the bottom of the main valve cylinder; the drainage device includes a traction slide, and the inner wall of the traction slide is rotatably connected to a guide slide through a slot. When the device is used for work, fine-tuning can be performed by screwing the rotating nut to change the hydraulic pressure of the discharged water. Since the water body always moves from top to bottom, and the drainage ports inside the drainage device and the pressure relief device are evenly distributed circumferentially, when the water body flows inside the device, the hydraulic pressure on the device always remains in a balanced state, thereby ensuring that the device is relatively firm and stable after vertical installation, avoiding the problem of uneven internal hydraulic force and inability to install stably.

Description

Technical Field

[0001] The invention belongs to the technical field of pressure control, in particular to a straight-through pressure relief valve. Background Art

[0002] Pressure relief valves are used in various piping systems. They automatically open and close based on the system's operating pressure and are typically installed on equipment or pipelines in closed systems to protect the system. When the pressure within the equipment or pipeline exceeds the set pressure, the valve automatically opens to release pressure, ensuring the pressure of the media within the equipment and pipeline remains below the set pressure, protecting the equipment and pipelines and preventing accidents.

[0003] The valve core inside the straight-through pressure relief valve usually performs adaptive adjustment according to the pressure of the incoming liquid to ensure that the hydraulic pressure at the discharge port is always a relatively stable value. However, the pressure at the inlet of the valve body is usually greater than the pressure at the outlet. In this way, the force acting on the valve body will be very unbalanced, causing the valve body to become loose and unstable after long-term use, posing safety hazards. Therefore, improvements are needed. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention solves the technical problems thereof by adopting the following technical solutions: a straight-through pressure relief valve, comprising a main valve cylinder, a flow diversion device is provided at the top of the inner wall of the main valve cylinder, a pressure relief device is provided at the middle of the inner wall of the main valve cylinder, and a flow discharge device is provided at the bottom of the main valve cylinder;

[0005] The drainage device includes a traction slide, the inner wall of the traction slide is rotatably connected to the guide slide through a slot, the top of the inner wall of the guide slide is fixedly connected to the water pipe, the outer surface of the traction slide is evenly provided with bent traction rods, the end of the bent traction rod away from the traction slide is fixedly connected to a rotating nut, the inner wall of the rotating nut is connected to the threaded groove on the upper part of the outer surface of the main valve cylinder, and the rotating nut is driven to rotate clockwise to push the drainage device downward as a whole;

[0006] The lower part of the outer surface of the guide slide is rotatably connected to the drainage slide housing, and the axis center of the inner wall of the drainage slide housing is fixedly connected to a spring washer, and the middle part of the spring washer is always fixed on the inner wall of the main valve cylinder. As the traction slide and the drainage slide housing move, the upper and lower sides of the spring washer will cause resistance to the traction slide and the drainage slide housing; the axis center of the bottom of the inner cavity of the guide slide is fixedly connected to a pressure-sensing inner cylinder, and the pressure-sensing inner cylinder can monitor the internal hydraulic pressure of the guide slide through the round-headed push rod at the top, and the lower part of the inner cavity of the guide slide is evenly provided with a one-way drainage component;

[0007] The pressure relief device includes a hollow cylindrical shell, the inner cavity of the hollow cylindrical shell is evenly provided with plug-in tubes through the socket, the inner wall of the hollow cylindrical shell is evenly provided with detectors, and plug-in inner plates are symmetrically provided on the front and back sides of the inner cavity of the detector. The detector performs hydraulic detection through the plug-in inner plates that can be pushed on both sides, and vertical grooves adapted to the plug-in inner plates are opened on both sides of the plug-in tube.

[0008] Furthermore, an external base plate is evenly disposed at the bottom of the outer surface of the guide slide. A drainage cannula is fixedly connected to the side of the upper surface of the external base plate away from the guide slide. The outer surface of the drainage cannula is slidably connected to the inner wall of the cannula. The side of the cannula inner plate away from the detector extends into the interior of the cannula through a notch. The inner wall of the rotating nut is threadedly connected to the top of the outer surface of the main valve barrel via a threaded groove. The lower portion of the outer surface of the traction slide is slidably connected to the top of the inner wall of the main valve barrel. The outer surface of the drainage slide is slidably connected to the inner wall of the main valve barrel. The top of the spring washer is fixedly connected to the bottom of the traction slide, and the middle portion of the outer surface of the spring washer is fixedly connected to the inner wall of the main valve barrel. The outer surface of the guide slide is slidably connected to the axis center of the inner wall of the hollow cylinder shell. The number of the drainage pipes is six, and the number of the detectors is six. The upper and lower sides of the detectors are fixedly connected to the inner wall of the hollow cylinder shell. The outer surface of the plug tube is fixedly connected to the inner cavity of the hollow cylinder shell, and the middle part of the inner wall of the main valve cylinder is fixedly connected to the outer surface of the hollow cylinder shell.

[0009] Furthermore, the one-way drainage component includes a sliding housing, the inner cavity of which is uniformly provided with through-grooves. Under normal circumstances, the through-grooves of the sliding housing are located within the guide slide. A docking pad is fixedly connected to the end of the sliding housing away from the guide slide. A spring pressure rod is fixedly connected to the end of the docking pad away from the sliding housing. A waterproof cushion is sleeved on the end of the outer surface of the sliding housing away from the spring pressure rod. The waterproof cushion prevents liquid from leaking out through the gap between the sliding housing and the guide slide. There are four sliding housings, each of which has an outer surface in sliding connection with the inner cavity of the guide slide. The end of the spring pressure rod away from the sliding housing is in sliding connection with the inner wall of the main valve cylinder. The waterproof cushion, on the side closest to the spring pressure rod, presses against the inner wall of the guide slide.

[0010] Furthermore, the drainage device includes a rotating bottom cylinder, a drainage groove is symmetrically provided in the middle of the inner cavity of the rotating bottom cylinder, a switching cylinder is rotatably connected to the bottom of the outer surface of the rotating bottom cylinder, and the inner cavity of the switching cylinder is symmetrically provided with a docking groove, which has the same shape as the drainage groove. When the two are successfully docked, the drainage device can normally relieve pressure and discharge liquid. Pressure-bearing air bags are symmetrically provided on both sides of the inner wall of the switching cylinder, and the inner cavity of the pressure-bearing air bag is fixedly connected to a pressure-sensitive plate through a thrust rod. The number of the pressure-bearing air bags is two, the outer surface of the pressure-bearing air bag is slidably connected to the inner wall of the switching cylinder, the outer surface of the pressure-sensitive plate is fixedly connected to one side of the outer surface of the switching cylinder, and the upper surface of the rotating bottom cylinder is fixedly connected to the bottom end of the main valve cylinder. The number of the drainage grooves is two, the number of the docking grooves is two, and the docking grooves extend to the upper and lower sides of the outer surface of the switching cylinder, and the axis of the top of the rotating bottom cylinder extends to the bottom of the inner cavity of the main valve cylinder.

[0011] The beneficial effects of the present invention are as follows:

[0012] 1. When the device is used for operation, the guide slide tube that introduces high-pressure water will divert the water to the pressure relief device at the bottom to achieve a pressure reduction effect, and the hydraulic pressure of the discharged water can be changed by screwing the rotating nut. Since the water always moves from top to bottom, and the drainage outlets inside the drainage device and the pressure relief device are evenly distributed on the circumference, when the water flows inside the device, the hydraulic pressure exerted on the device always remains balanced, thereby ensuring that the device is relatively firm and stable after vertical installation, and avoiding the problem of uneven internal hydraulic force and instability of installation.

[0013] 2. The device drains water through the socket of the drain pipe that slides out of the plug-in tube. When the drain pipe does not slide out completely from the inside of the plug-in tube, part of the hydraulic pressure will act on the inner wall of the plug-in tube, thereby causing the pressure surface of the plug-in inner plate to be subjected to hydraulic pressure, so that the detector can monitor the force of the divided pressure, and then adjust the rotating nut to achieve pressure reduction while ensuring that the water pressure does not exceed the pressure range of the pressure relief device, thereby preventing the pressure relief device from being damaged due to the hydraulic pressure that exceeds its own capacity.

[0014] 3. A one-way drainage component is installed at the bottom of the guide slide to ensure that the water discharged from the guide slide will not flow back into the guide slide due to insufficient supply pressure, causing water pollution problems, and the one-way drainage component can slide synchronously along the inner wall of the main valve cylinder with the vertical movement of the guide slide, so the one-way drainage component can actually have a limiting effect on the guide slide, thereby avoiding the guide slide from sliding too far, causing the drainage plug to be completely detached from the inside of the plug-in tube; and preventing the plug-in tube and the drainage plug from being misaligned, resulting in the drainage plug being unable to be reinserted into the plug-in tube.

[0015] 4. The drainage equipment can be controlled by the operator to completely misalign the drainage groove and the docking groove, close the valve body, achieve the water sealing effect, and realize the function of blocking the water body. When draining, if the water pressure is too high, part of the water in the inner cavity of the switching drum will squeeze the pressurized air bags on both sides, thereby pushing the internal rod to act on the pressure-sensitive plate, and then detect the actual water storage volume inside the switching drum. If the water storage volume is large, it is necessary to reduce the pressure in time to avoid the problem of excessive water accumulation inside the main valve drum. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front view of the present invention;

[0017] Figure 2 is a cross-sectional view of the main valve cylinder of the present invention;

[0018] Figure 3 is a cross-sectional view of the drainage device of the present invention;

[0019] Figure 4 is a cross-sectional view of the pressure relief device of the present invention;

[0020] Figure 5 It is a structural schematic diagram of the one-way drainage component of the present invention;

[0021] Figure 6 is a cross-sectional view of the drainage device of the present invention;

[0022] Figure 7 It is a cross-sectional view of the drainage device after the docking groove and the drainage trough of the present invention are docked.

[0023] In the figure: 1. Drainage device; 11. Traction slide; 12. Guide slide; 13. Water pipe; 14. Bending traction rod; 15. Rotating nut; 16. Drainage slide shell; 17. Pressure-sensitive inner cylinder; 18. Spring washer; 2. Main valve cylinder; 3. Pressure relief device; 31. Hollow cylinder shell; 32. Plug-in tube; 33. Detector; 34. Plug-in inner plate; 35. External bottom plate; 36. Drainage plug; 5. One-way drainage component; 51. Sliding sleeve; 52. Through-cut groove; 53. Waterproof cushion; 54. Docking pad; 55. Spring pressure rod; 4. Drainage device; 41. Rotating bottom cylinder; 42. Drainage trough; 43. Switching cylinder; 44. Docking groove; 45. Pressure airbag; 46. Pressure-sensitive plate. DETAILED DESCRIPTION

[0024] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for purposes of illustration and description and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are chosen and described to better illustrate the principles of the invention and its practical application, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for specific applications.

[0025] Example 1, please refer to Figures 1-4 The present invention provides a technical solution: a straight-through pressure relief valve, comprising a main valve cylinder 2, a flow guide device 1 is provided at the top of the inner wall of the main valve cylinder 2, a pressure relief device 3 is provided at the middle of the inner wall of the main valve cylinder 2, and a discharge device 4 is provided at the bottom of the main valve cylinder 2;

[0026] The drainage device 1 includes a traction slide 11, the inner wall of the traction slide 11 is rotatably connected to the guide slide 12 through a slot, the top of the inner wall of the guide slide 12 is fixedly connected to the water pipe 13, the outer surface of the traction slide 11 is evenly provided with bent traction rods 14, and the end of the bent traction rod 14 away from the traction slide 11 is fixedly connected to a rotating nut 15, the inner wall of the rotating nut 15 is connected to the threaded groove on the upper part of the outer surface of the main valve cylinder 2, and the rotating nut 15 is driven to rotate clockwise to push the drainage device 1 downward as a whole;

[0027] The lower part of the outer surface of the guide slide 12 is rotatably connected to the drainage slide housing 16, and the axis center of the inner wall of the drainage slide housing 16 is fixedly connected to a spring washer 18. The middle part of the spring washer 18 is always fixed on the inner wall of the main valve cylinder 2. As the traction slide 11 and the drainage slide housing 16 move, the upper and lower sides of the spring washer 18 will cause resistance to the traction slide 11 and the drainage slide housing 16. The axis center of the bottom of the inner cavity of the guide slide 12 is fixedly connected to a pressure-sensing inner cylinder 17. The pressure-sensing inner cylinder 17 can monitor the internal hydraulic pressure of the guide slide 12 through the round-headed push rod at the top. The lower part of the inner cavity of the guide slide 12 is evenly provided with a one-way drainage component 5.

[0028] The pressure relief device 3 includes a hollow cylindrical shell 31. The inner cavity of the hollow cylindrical shell 31 is evenly provided with plug-in tubes 32 through the through-sockets. The inner wall of the hollow cylindrical shell 31 is evenly provided with detectors 33. The front and rear sides of the inner cavity of the detector 33 are symmetrically provided with plug-in inner plates 34. The detector 33 performs hydraulic detection through the plug-in inner plates 34 that can be pushed on both sides. Vertical grooves adapted to the plug-in inner plates 34 are opened on both sides of the plug-in tube 32.

[0029] The bottom of the outer surface of the guide slide 12 is evenly provided with an external base plate 35. A drainage insert 36 is fixedly connected to the side of the upper surface of the external base plate 35 away from the guide slide 12. The outer surface of the drainage insert 36 is slidably connected to the inner wall of the insert tube 32. The side of the insert inner plate 34 away from the detector 33 extends into the interior of the insert tube 32 through a notch. The inner wall of the rotating nut 15 is threadedly connected to the top of the outer surface of the main valve barrel 2 through a thread groove. The lower portion of the outer surface of the traction slide 11 is slidably connected to the top of the inner wall of the main valve barrel 2. The outer surface of the drainage slide housing 16 is slidably connected to the inner wall of the main valve barrel 2. The top of the spring washer 18 is fixedly connected to the bottom of the traction slide 11, and the middle portion of the outer surface of the spring washer 18 is fixedly connected to the inner wall of the main valve barrel 2. The outer surface of the guide slide 12 is slidably connected to the axis center of the inner wall of the hollow cylindrical shell 31. There are six drainage pipes 36 and six detectors 33. The upper and lower sides of the detectors 33 are fixedly connected to the inner wall of the hollow cylindrical shell 31. The outer surface of the plug tube 32 is fixedly connected to the inner cavity of the hollow cylindrical shell 31. The middle part of the inner wall of the main valve cylinder 2 is fixedly connected to the outer surface of the hollow cylindrical shell 31.

[0030] To use this device, the water pipe 13 at the top is fixedly connected to the drain port of the pipe body, and then the water flows into the interior of the guide slide 12 under the action of water pressure, and is first discharged to the upper part of the pressure relief device 3 through the one-way drainage component 5. After adjustment, the water can be discharged downward through the pressure relief device 3 and the pressure is reduced, and then the depressurized water is discharged from the drainage device 4.

[0031] When performing pressure regulation, the operator rotates the rotating nut 15 clockwise from the outside. When the rotating nut 15 is spirally advanced downward along the outer surface of the main valve cylinder 2, the rotating nut 15 drives the traction slide 11 to rotate downward and advance the guide slide 12 through the bent traction rod 14, so that the guide slide 12 gradually slides down along the inner wall of the main valve cylinder 2. At this time, the drainage plug 36 that is fully inserted into the plug tube 32 will slide down with the guide slide 12, and then the water will be discharged downward through the groove through which the drainage plug 36 slides out.

[0032] When the drain cannula 36 is draining, since part of the drain cannula 36 is still located inside the plug tube 32, the water pressure will cause a hydraulic effect on the inner wall of the plug tube 32. At this time, the water pressure will squeeze the side of the plug inner plate 34, so that the pressure of the water inside the hollow cylindrical shell 31 can be detected by the detector 33. Combined with the pressure measurement effect of the pressure-sensitive inner cylinder 17, the pressure reduction amplitude of the device can be determined, and the water pressure intensity discharged by the drain cannula 36 can be adjusted by rotating the nut 15 with the knob.

[0033] Example 2, please refer to Figure 1-Figure 7The present invention provides a technical solution: Based on the first embodiment, the one-way drainage component 5 includes a sliding housing 51, the inner cavity of which is uniformly provided with through-cut grooves 52. Under normal circumstances, the through-cut grooves 52 of the sliding housing 51 are located inside the guide slide 12. A docking plate 54 is fixedly connected to the end of the sliding housing 51 away from the guide slide 12. A spring pressure rod 55 is fixedly connected to the end of the docking plate 54 away from the sliding housing 51. A waterproof cushion 53 is sleeved on the end of the outer surface of the sliding housing 51 away from the spring pressure rod 55. The waterproof cushion 53 can prevent liquid from leaking out through the gap between the sliding housing 51 and the guide slide 12. There are four sliding housings 51. The outer surface of the sliding housing 51 is slidably connected to the inner cavity of the guide slide 12. The end of the spring pressure rod 55 away from the sliding housing 51 is slidably connected to the inner wall of the main valve cylinder 2. The side of the waterproof cushion 53 near the spring pressure rod 55 is pressed against the inner wall of the guide slide 12.

[0034] The drainage device 4 includes a rotating bottom cylinder 41. A drainage groove 42 is symmetrically defined in the middle of the inner cavity of the rotating bottom cylinder 41. A switching cylinder 43 is rotatably connected to the bottom of the outer surface of the rotating bottom cylinder 41. The inner cavity of the switching cylinder 43 is symmetrically defined with docking grooves 44. The docking grooves 44 and the drainage grooves 42 are identical in shape. When the two are successfully docked, the drainage device 4 can properly relieve pressure and discharge fluid. Pressure-bearing airbags 45 are symmetrically provided on both sides of the inner wall of the switching cylinder 43. The inner cavity of the pressure-bearing airbags 45 is fixedly connected to a pressure-sensitive plate 46 via a thrust rod. There are two pressure-bearing airbags 45. The outer surface of each pressure-bearing airbag 45 is slidably connected to the inner wall of the switching cylinder 43. The outer surface of the pressure-sensitive plate 46 is fixedly connected to one side of the outer surface of the switching cylinder 43. The upper surface of the rotating bottom cylinder 41 is fixedly connected to the bottom end of the main valve cylinder 2. There are two drainage grooves 42 and two docking grooves 44 , and the docking grooves 44 extend to the upper and lower sides of the outer surface of the switching cylinder 43 , and the axis of the top of the rotating bottom cylinder 41 extends to the bottom of the inner cavity of the main valve cylinder 2 .

[0035] When the water inside the guide slide 12 is discharged from the through groove 52 of the sliding housing 51, the sliding housing 51 is first pushed toward the outside of the guide slide 12. At this time, the through groove 52 connects the inside and outside of the guide slide 12, and the waterproof cushion 53 is further compressed to prevent the water from being discharged through the gap between the guide slide 12 and the sliding housing 51. After the sliding housing 51 is pushed forward and slid, the docking pad 54 also compresses the spring pressure rod 55 under the action of thrust. When the water supply pressure of the water pipe 13 is insufficient, the spring pressure rod 55 will push the sliding housing 51 toward the inside of the guide slide 12, thereby preventing the discharged water pressure from flowing back into the water pipe 13, thereby playing a role of automatic isolation.

[0036] The operator can rotate the switching drum 43 at the bottom around the rotating bottom drum 41 to connect the drainage groove 42 with the docking groove 44. Figure 7As shown, the drainage device 4 is working normally at this time. When the drainage stops, the drum 43 is rotated and switched so that the drainage groove 42 and the docking groove 44 are completely dislocated. Figure 6 As shown, the drainage groove 42 is blocked, thereby preventing the equipment from leaking. During drainage, if the water pressure is too high, part of the water in the inner cavity of the switching drum 43 will squeeze the pressurized air bags 45 on both sides, thereby pushing the internal rod to act on the pressure-sensitive plate 46, and then detecting the actual water storage volume inside the switching drum 43.

[0037] Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without making creative efforts should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention shall be implemented in accordance with conventional means in the field unless otherwise specified or limited.

Claims

1. A straight-through pressure relief valve, comprising a main valve cylinder (2), a flow guide device (1) being provided at the top of the inner wall of the main valve cylinder (2), a pressure relief device (3) being provided at the middle of the inner wall of the main valve cylinder (2), and a flow discharge device (4) being provided at the bottom of the main valve cylinder (2), characterized in that: The drainage device (1) comprises a traction slide (11), the inner wall of the traction slide (11) is rotatably connected to a guide slide (12) via a slot, the top of the inner wall of the guide slide (12) is fixedly connected to a water pipe (13), the outer surface of the traction slide (11) is evenly provided with bent traction rods (14), and one end of the bent traction rod (14) away from the traction slide (11) is fixedly connected to a rotating nut (15); The lower portion of the outer surface of the guide slide (12) is rotatably connected to a drainage slide housing (16), a spring washer (18) is fixedly connected to the axis of the inner wall of the drainage slide housing (16), a pressure-sensing inner cylinder (17) is fixedly connected to the axis of the bottom of the inner cavity of the guide slide (12), and a one-way drainage component (5) is evenly arranged at the lower portion of the inner cavity of the guide slide (12); The pressure relief device (3) comprises a hollow cylindrical shell (31), the inner cavity of the hollow cylindrical shell (31) is evenly provided with plug-in tubes (32) through a through-socket, the inner wall of the hollow cylindrical shell (31) is evenly provided with detectors (33), and plug-in inner plates (34) are symmetrically provided on the front and rear sides of the inner cavity of the detector (33); The drainage device (4) includes a rotating bottom cylinder (41), a drainage groove (42) is symmetrically provided in the middle of the inner cavity of the rotating bottom cylinder (41), a switching rotating cylinder (43) is rotatably connected to the bottom of the outer surface of the rotating bottom cylinder (41), a docking groove (44) is symmetrically provided in the inner cavity of the switching rotating cylinder (43), and pressure-bearing air bags (45) are symmetrically provided on both sides of the inner wall of the switching rotating cylinder (43), and the inner cavity of the pressure-bearing air bag (45) is fixedly connected to a pressure-sensitive plate (46) through a thrust rod; There are two pressurized air bags (45), the outer surface of which is slidably connected to the inner wall of the switching drum (43), the outer surface of the pressure-sensitive plate (46) is fixedly connected to one side of the outer surface of the switching drum (43), and the upper surface of the rotating bottom drum (41) is fixedly connected to the bottom end of the main valve drum (2).

2. The straight-through pressure relief valve according to claim 1, characterized in that: An external base plate (35) is evenly provided at the bottom of the outer surface of the guide slide (12), and a drainage plug (36) is fixedly connected to the side of the upper surface of the external base plate (35) away from the guide slide (12). The outer surface of the drainage plug (36) is slidably connected to the inner wall of the plug tube (32), and the side of the plug inner plate (34) away from the detector (33) extends to the interior of the plug tube (32) through a notch.

3. The straight-through pressure relief valve according to claim 2, characterized in that: The inner wall of the rotating nut (15) is threadedly connected to the top of the outer surface of the main valve cylinder (2) through a thread groove, the lower part of the outer surface of the traction slide (11) is slidably connected to the top of the inner wall of the main valve cylinder (2), the outer surface of the drainage slide shell (16) is slidably connected to the inner wall of the main valve cylinder (2), the top of the spring washer (18) is fixedly connected to the bottom of the traction slide (11), and the middle part of the outer surface of the spring washer (18) is fixedly connected to the inner wall of the main valve cylinder (2).

4. The straight-through pressure relief valve according to claim 3, characterized in that: The outer surface of the guide slide (12) is slidably connected to the axis of the inner wall of the hollow cylinder shell (31), the number of the drainage plugs (36) is six, the number of the detectors (33) is six, the upper and lower sides of the detectors (33) are fixedly connected to the inner wall of the hollow cylinder shell (31), the outer surface of the plug tube (32) is fixedly connected to the inner cavity of the hollow cylinder shell (31), and the middle part of the inner wall of the main valve cylinder (2) is fixedly connected to the outer surface of the hollow cylinder shell (31).

5. The straight-through pressure relief valve according to claim 1, characterized in that: The one-way drainage component (5) comprises a sliding housing (51), an inner cavity of the sliding housing (51) is uniformly provided with through grooves (52), an end of the sliding housing (51) away from the guide slide (12) is fixedly connected to a docking pad (54), an end of the docking pad (54) away from the sliding housing (51) is fixedly connected to a spring pressure rod (55), and an end of the outer surface of the sliding housing (51) away from the spring pressure rod (55) is sleeved with a waterproof cushion (53).

6. The straight-through pressure relief valve according to claim 5, characterized in that: The number of the sliding housings (51) is four, and the outer surface of the sliding housing (51) is slidably connected to the inner cavity of the guide slide cylinder (12). The end of the spring pressure rod (55) away from the sliding housing (51) is slidably connected to the inner wall of the main valve cylinder (2), and the side of the waterproof cushion (53) close to the spring pressure rod (55) is pressed against the inner wall of the guide slide cylinder (12).

7. The straight-through pressure relief valve according to claim 1, characterized in that: The number of the drainage grooves (42) is two, the number of the docking grooves (44) is two, and the docking grooves (44) extend to the upper and lower sides of the outer surface of the switching rotating cylinder (43), and the axis of the top of the rotating bottom cylinder (41) extends to the bottom of the inner cavity of the main valve cylinder (2).

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