Spring-loaded pilot-self-operated release valve

Abstract

The invention discloses a spring loading pilot-self-operated release valve, and relates to the field of pressure release systems. The spring-loaded pilot-self-operated release valve comprises a valve body, a butterfly plate is rotatably connected in the valve body through a driven rod, the spring-loaded pilot-self-operated release valve further comprises a driving cylinder arranged above the valve body and communicated with the valve body through a sleeve, the driven rod is located in the sleeve, and the driven rod extends upwards into the driving cylinder; the driving rod is arranged in the driving cylinder; after the control mechanism monitors that the pressure intensity in the pipeline exceeds a specified safety value, the shifting fork assembly is controlled to quickly loosen the check block at the moment, then the butterfly plate can quickly rotate under the tensioning force of the first tensioning spring, the valve body is quickly opened to release the pressure of the pipeline, and accidents caused by overpressure are prevented; and the reaction sensitivity of the opening release pressure of the release valve is effectively improved.

Description

Technical Field

[0001] This invention belongs to the technical field of pressure relief systems, specifically, it relates to a spring-loaded pilot-operated self-operated relief valve. Background Technology

[0002] In some petrochemical pressure storage tanks and flare systems, safety devices are usually installed on these systems to ensure the safety of the medium in the pipeline pressure system. The safety devices can prevent overpressure in the pipeline. When the pressure in the pipeline exceeds the limit, the safety device will open to release the pressure in the pipeline and prevent overpressure from causing a safety accident.

[0003] When the internal pressure of a pipeline exceeds the limit, although most valves can release the pressure, the valve opening sensitivity may be affected by uncertain factors such as temperature, medium, and valve specifications during actual use, resulting in delayed opening. Therefore, the valve opening sensitivity has become a necessary requirement for high-quality valves. In view of this, a spring-loaded pilot-operated self-operated relief valve is proposed to ensure the valve opening sensitivity. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a spring-loaded pilot-operated self-operated relief valve that can overcome or at least partially solve the above problems.

[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows: a spring-loaded pilot-operated self-operated relief valve, including a valve body, in which a butterfly plate is rotatably connected via a driven rod, and further including: a drive cylinder, disposed above the valve body and connected to the valve body via a sleeve, the driven rod being located inside the sleeve and extending upward into the drive cylinder; a drive rod, disposed inside the drive cylinder; a rotating plate, fixedly connected to one end of the driven rod located inside the drive cylinder; an adjusting column, fixedly connected to the drive rod, the rotating plate having a groove for cooperating with the adjusting column; and a stop block, fixedly connected to the drive rod extending out of the drive cylinder. One end of the drive cylinder; a sliding cylinder, slidably connected inside the drive cylinder and fixedly connected to the end of the drive rod away from the stop; a first tension spring, sleeved on the drive rod, with both ends of the first tension spring fixedly connected to the drive cylinder and the sliding cylinder respectively; a loading mechanism for loading the first tension spring, installed on the drive cylinder; a fork assembly for tensioning the first tension spring, installed on the side of the drive cylinder near the stop via a mounting frame; a control mechanism for controlling the opening and closing of the fork assembly, installed within the mounting frame, with the pressure detection end of the control mechanism connected to the medium inlet side of the valve body via a pressure tapping pipe.

[0006] Furthermore, the loading mechanism includes a lead screw and a handwheel, the lead screw being threadedly connected to the end of the drive cylinder away from the mounting frame, and the handwheel being fixedly connected to the lead screw.

[0007] To facilitate a more effortless return of the first tension spring, the loading mechanism further includes a manual hydraulic cylinder, which is fixedly connected inside the drive cylinder to the side near the sliding cylinder, and the manual oiling component in the manual hydraulic cylinder is installed on the outside of the drive cylinder.

[0008] Furthermore, the shift fork assembly includes a housing, a gripper, and a tension spring. The housing is installed inside the mounting frame on the side near the stop, and the gripper is symmetrically rotatably connected inside the housing on the side away from the stop via a pivot. The two ends of the tension spring are respectively connected to the housing and the gripper.

[0009] Furthermore, the control mechanism includes a detection unit, a pilot valve piston assembly, and a spring assembly. The detection unit is connected to the valve body via a pressure tapping pipe and is used to detect the pressure inside the pressure tank. The pilot valve piston assembly works in conjunction with a tension spring to control the opening or closing of the gripper. The spring assembly is used to control the reset of the pilot valve piston assembly.

[0010] To facilitate application to low-pressure storage tanks, the detection unit further includes a low-pressure pilot valve, which is mounted on the mounting frame, and the two ends of the pressure tapping pipe are respectively connected to the low-pressure pilot valve and the valve body.

[0011] To facilitate application to high-pressure storage tanks, the detection unit further includes a high-pressure pilot valve, which is mounted on the mounting frame, and the two ends of the pressure tapping pipe are respectively connected to the high-pressure pilot valve and the valve body.

[0012] Furthermore, the pilot valve piston assembly includes an upper valve stem, a gourd-shaped piston, and a lower valve stem. The upper and lower ends of the gourd-shaped piston are respectively connected to the upper valve stem and the lower valve stem. The upper valve stem, the gourd-shaped piston, and the lower valve stem, which are connected as a whole, are vertically slidably connected to the mounting frame. A roller is rotatably connected to the end of the gripper near the gourd-shaped piston. The roller rolls on the gourd surface of the gourd-shaped piston. The upper end of the upper valve stem is connected to a low-pressure pilot valve or a high-pressure pilot valve, and the lower end of the lower valve stem is connected to a spring assembly.

[0013] Furthermore, the spring assembly includes a mounting cylinder, an upper spring seat, a lower spring seat, a second tension spring, and an adjusting screw. The mounting cylinder is mounted on the lower end of the mounting frame, the upper spring seat is fixedly mounted on the lower end of the lower valve stem, the adjusting screw is threadedly connected to the lower end of the mounting cylinder, the lower spring seat is fixedly mounted on the upper end of the adjusting screw, and the two ends of the second tension spring are respectively connected to the upper spring seat and the lower spring seat.

[0014] To facilitate automatic control of the return of the first tension spring, a rotating rod is further included. The rotating rod is rotatably connected to a pressure relief pipe connected to the valve body on the pressure storage tank. Multiple blades are fixedly connected to the rotating rod at equal intervals around its circumference. The lower end of the drive cylinder is fixedly connected to an air storage tank via a connecting rod. An air cylinder is connected to the air inlet of the air storage tank. A piston rod with a piston is slidably connected inside the air cylinder. A rotating wheel is installed at the lower end of the piston rod. A pressure relief pipe extends from the end of the rotating rod near the air cylinder and is fixedly connected to a crank that abuts against the rotating wheel. One-way valves are installed in both the air inlet and outlet of the air cylinder. An air outlet and an exhaust port are respectively opened on the air storage tank. A first solenoid valve and a second solenoid valve are respectively installed in the air outlet and exhaust port. An air supply pipe is connected to the air outlet of the air storage tank. An air supply port is opened at the end of the drive cylinder near the loading mechanism. The end of the air supply pipe away from the air storage tank is connected to the air supply port of the drive cylinder.

[0015] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: The present invention uses the coordinated use of components such as driving cylinder, first tension spring, sliding cylinder, driving rod, adjusting column, rotating plate, driven rod, stop block, shift fork assembly, control mechanism and pressure tapping pipe. When the control mechanism detects that the pressure in the pipeline exceeds the specified safety value, it will control the shift fork assembly to quickly release the stop block. Then the butterfly plate will rotate quickly under the tension of the first tension spring, so that the valve body can quickly open to release the pipeline pressure, prevent overpressure from causing accidents, effectively improve the response sensitivity of the relief valve to release pressure, and the opening sensitivity is not affected by the medium temperature and corrosiveness. At the same time, it can be reused without replacing any parts.

[0016] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0017] In the attached diagram:

[0018] Figure 1 This is an isometric view of the present invention;

[0019] Figure 2 This is a partial right-side sectional view of the butterfly plate closing when the low-pressure pilot valve is used in this invention;

[0020] Figure 3 This is a partial sectional view on the right side showing the butterfly plate opening when the low-pressure pilot valve is used in this invention;

[0021] Figure 4 This is a partial right-side sectional view of the butterfly plate closing when the spring-loaded pilot-operated self-operated relief valve proposed in this invention is used with a high-pressure pilot valve.

[0022] Figure 5 This is a top partial sectional view showing the hydraulically operated manual butterfly valve of the present invention.

[0023] Figure 6 This is a partial top sectional view of the hydraulically operated manual butterfly valve closing mechanism of the present invention.

[0024] Figure 7 This is a top partial sectional view of the invention using a handwheel-operated butterfly gate for manual opening;

[0025] Figure 8 This is a partial sectional view of the front view of the hydraulically operated butterfly valve closing mechanism of the present invention.

[0026] Figure 9 This is a partial sectional view of the front view of the invention using a handwheel-operated butterfly plate for manual closure;

[0027] Figure 10 This is a cross-sectional view of the valve body, driven rod, and butterfly plate in this invention.

[0028] Figure 11 This is a three-dimensional structural diagram of the housing, grippers, and tension spring in this invention;

[0029] Figure 12 This is a partial sectional view from the front of the rotating rod, blade, air tank, air cylinder, motor, and whistle mounted on the pressure relief pipe and drive cylinder in this invention.

[0030] Figure 13 This is a schematic diagram of the structure of the rotating rod, crank, air tank, air cylinder, piston rod, motor, adjusting plate, air supply pipe, and whistle in this invention;

[0031] Figure 14 This is a top partial sectional view of the gas storage tank, rotating plate, gas pipeline, and whistle in this invention.

[0032] In the diagram: 1. Valve body; 101. Butterfly plate; 102. Driven rod; 103. Sleeve; 2. Drive cylinder; 201. First tension spring; 202. Sliding cylinder; 203. Drive rod; 204. Adjusting column; 205. Rotating plate; 206. Stop block; 207. Lead screw; 208. Manual hydraulic cylinder; 3. Mounting frame; 301. Low-pressure pilot valve; 302. Housing; 303. Gripper; 3031. Rotating column; 3032. Limit rod; 304. Tension spring; 305. Limit pin; 306. Roller; 307. High-pressure pilot valve; 4. Pilot valve piston assembly; 401. Upper valve stem; 402. Hoist 403. Lower valve stem; 5. Spring assembly; 501. Mounting cylinder; 502. Upper spring seat; 503. Lower spring seat; 504. Second tension spring; 505. Adjusting screw; 506. Push rod; 507. Fixing sleeve; 508. Pressure sensor; 6. Pressure tapping pipe; 7. Rotating rod; 701. Blade; 702. Crank; 8. Air tank; 801. First air chamber; 802. Second air chamber; 803. Third air chamber; 804. Air cylinder; 805. Piston rod; 806. Rotating wheel; 807. Adjusting plate; 808. Motor; 809. Air supply pipe; 8010. Whistle. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0034] Example 1:

[0035] Reference Figures 1-14A spring-loaded pilot-operated self-operated relief valve includes a valve body 1, with a butterfly plate 101 rotatably connected inside the valve body 1 via a driven rod 102. It also includes: a drive cylinder 2, positioned above the valve body 1 and connected to the valve body 1 via a sleeve 103, with the driven rod 102 located inside the sleeve 103 and extending upwards into the drive cylinder 2; a drive rod 203, located inside the drive cylinder 2; a rotating plate 205, fixedly connected to the end of the driven rod 102 located inside the drive cylinder 2; an adjusting column 204, fixedly connected to the drive rod 203, with a groove on the rotating plate 205 for use with the adjusting column 204; and a stop block 206, fixedly connected to the end of the drive rod 203 extending out of the drive cylinder 2. The sliding cylinder 202 is slidably connected inside the drive cylinder 2 and fixedly connected to the end of the drive rod 203 away from the stop 206; the first tension spring 201 is sleeved on the drive rod 203, and the two ends of the first tension spring 201 are fixedly connected to the drive cylinder 2 and the sliding cylinder 202 respectively; a loading mechanism for loading the first tension spring 201 is installed on the drive cylinder 2; a shift fork assembly for tightening the first tension spring 201 is installed on the side of the drive cylinder 2 near the stop 206 through the mounting frame 3; a control mechanism for controlling the opening and closing of the shift fork assembly is installed in the mounting frame 3, and the pressure detection end of the control mechanism is connected to the medium inlet side of the valve body 1 through the pressure tapping pipe 6.

[0036] The shift fork assembly includes a housing 302, a gripper 303, and a tension spring 304. The housing 302 is installed in the mounting frame 3 on the side near the stop 206. The gripper 303 is symmetrically connected to the side of the housing 302 away from the stop 206 via a pivot. The two ends of the tension spring 304 are connected to the housing 302 and the gripper 303, respectively.

[0037] The control mechanism includes a detection unit, a pilot valve piston assembly 4, and a spring assembly 5. The detection unit is connected to the valve body 1 through a pressure tapping pipe 6 and is used to detect the pressure in the pressure tank. The pilot valve piston assembly 4 works in conjunction with a tension spring 304 to control the opening or closing of the gripper 303. The spring assembly 5 is used to control the reset of the pilot valve piston assembly 4.

[0038] The pilot valve piston assembly 4 includes an upper valve stem 401, a gourd-shaped piston 402, and a lower valve stem 403. The upper and lower ends of the gourd-shaped piston 402 are respectively connected to the upper valve stem 401 and the lower valve stem 403. The upper valve stem 401, the gourd-shaped piston 402, and the lower valve stem 403, which are connected as a whole, are vertically slidably connected to the mounting frame 3. A roller 306 is rotatably connected to one end of the gripper 303 near the gourd-shaped piston 402. The roller 306 rolls on the gourd surface of the gourd-shaped piston 402. The upper end of the upper valve stem 401 is connected to the low-pressure pilot valve 301 or the high-pressure pilot valve 307, and the lower end of the lower valve stem 403 is connected to the spring assembly 5.

[0039] The spring assembly 5 includes a mounting cylinder 501, an upper spring seat 502, a lower spring seat 503, a second tension spring 504, and an adjusting screw 505. The mounting cylinder 501 is mounted on the lower end of the mounting frame 3. The upper spring seat 502 is fixedly mounted on the lower end of the lower valve stem 403. The adjusting screw 505 is threadedly connected to the lower end of the mounting cylinder 501. The lower spring seat 503 is fixedly mounted on the upper end of the adjusting screw 505. The two ends of the second tension spring 504 are connected to the upper spring seat 502 and the lower spring seat 503, respectively.

[0040] In petrochemical pressure storage tanks and flare systems, to ensure the safety of this pipeline pressure system, the valve body 1 of the relief valve can be bolted to the pressure relief pipe port of the pressure storage tank or flare system. Initially, the valve body 1 is closed, with the inlet of the pressure tapping pipe 6 connected to the side of the valve body 1 closest to the pressure relief pipe. This ensures that the pressure inside the detection unit is the same as the pipeline pressure in the pressure storage tank or flare system. When the pressure in the pipeline increases, the pressure inside the detection unit also increases. The detection unit then controls the gourd-shaped piston 402 to continuously move downwards via the upper valve stem 401. The gourd-shaped piston 402 then continuously compresses the second tension spring 504 via the lower valve stem 403 and the upper spring seat 502. Simultaneously, the roller 306 on the gripper 303 rolls on the gourd-shaped piston 402's arc surface, and the gripper 303 is connected to the housing 302. The tension spring 304 causes the clamping ends of the two grippers 303 to move further apart under the tension of the gourd-shaped piston 402 as it moves downward. When the pressure in the pipeline reaches the set value, the gourd-shaped piston 402 will overcome the second tension spring 504 and move to the lowest point. Then the stop block 206 will completely disengage from the two grippers 303. At the same time, the force restricting the first tension spring 201 will completely disappear, and the compressed first tension spring 201 will quickly return to its original position. When the first tension spring 201 returns to its original position, it will drive the drive rod 203 to move quickly away from the grippers 303 via the sliding cylinder 202. The drive rod 203 will then drive the rotating plate 205 to rotate via the adjusting column 204. The rotating plate 205 will then drive the butterfly plate 101 to rotate quickly via the driven rod 102, thereby allowing the valve body 1 to open quickly and release the pressure in the pipeline, preventing overpressure accidents.

[0041] Once the pressure inside the pipeline returns to a safe range, the pressure on the second tension spring 504 will decrease, and the pilot valve piston assembly 4 will continuously move upwards. This is due to the roller 306...

[0042] Because the roller 306 on the gripper 303 rolls on the gourd-shaped piston 402's arc surface, the roller 306 has a tendency to climb, and the tension spring 304 also exerts a pulling force on the gripper 303. Therefore, the roller 306 will exert a large downward force on the gourd-shaped piston 402, thereby controlling the pilot valve piston assembly 4 to move slowly upward, and the gripper 303 will also close slowly. During the closing process of the two grippers 303, the operator can push the sliding cylinder 202 to move through the loading mechanism to compress the first tension spring 201. Then, the drive rod 203 will move the stop block 206 between the two grippers 303. When the two grippers 303 are reset, the stop block 206 can be clamped and limited, so that the valve body 1 is in the closed state.

[0043] Example 2:

[0044] Reference Figures 1-14 The spring-loaded pilot-operated self-operated relief valve is basically the same as that in Embodiment 1. Furthermore, the loading mechanism includes a lead screw 207 and a handwheel. The lead screw 207 is threadedly connected to the end of the drive cylinder 2 away from the mounting frame 3, and the handwheel is fixedly connected to the lead screw 207.

[0045] When the butterfly plate 101 is opened, the pressure of the pressure tank is released. When the butterfly plate 101 needs to be reset, the operator can turn the handwheel, which will drive the lead screw 207 to rotate. Since the lead screw 207 is threadedly connected to the drive cylinder 2, when the lead screw 207 rotates, it will move into the drive cylinder 2 under the action of the thread. When the lead screw 207 contacts the sliding cylinder 202, it can push the sliding cylinder 202 to drive the drive rod 203 to move, so that the butterfly plate 101 can be closed by controlling the driven rod 102.

[0046] Example 3:

[0047] Reference Figures 1-14 The spring-loaded pilot-operated self-operated relief valve is basically the same as in Embodiment 2. Furthermore, the loading mechanism includes a manual hydraulic cylinder 208, which is fixedly connected inside the drive cylinder 2 to the side near the sliding cylinder 202. The manual oil injection component in the manual hydraulic cylinder 208 is installed on the outside of the drive cylinder 2.

[0048] When the butterfly plate 101 is opened, the pressure in the pressure tank is released. When the butterfly plate 101 needs to be reset, the operator can inject oil into the manual hydraulic cylinder 208 through the manual oil injection component. The oil pressure drives the first tension spring 201 to compress through the sliding cylinder 202, which in turn drives the driven rod 102 to rotate through the drive rod 203, thus closing the butterfly plate 101. The advantage of using the manual hydraulic cylinder 208 to drive the compression of the first tension spring 201 is that the hydraulic manual operation is more labor-saving, and the hydraulic oil in the hydraulic cylinder plays a buffering role when the first tension spring 201 returns to its original position. This provides corresponding protection for the components in the loading mechanism of the butterfly plate 101, greatly reducing the impact force generated during use.

[0049] Example 4:

[0050] Reference Figures 1-14 The spring-loaded pilot-operated self-operated relief valve is basically the same as in Example 3, except that the butterfly plate 101 is an eccentric butterfly plate, such as... Figure 10 As shown, by designing the butterfly plate 101 as an eccentric shape, the resistance of the medium when the butterfly plate 101 is opened can be reduced, so that the butterfly plate 101 can be opened more quickly, further improving the sensitivity of the relief valve at the start.

[0051] The gripper 303 includes a rotating column 3031 and a limiting rod 3032. The rotating column 3031 rotates within the housing 302 via a rotating shaft. The limiting rod 3032 is rotatably connected to one end of the stop block 206 near the rotating column 3031. A tension spring 304 is connected to the limiting rod 3032. A limiting pin 305 is fixedly connected to the side wall of the housing 302 near the rotating column 3031.

[0052] By making the gripper 303 consist of a rotating column 3031 and a limiting rod 3032, when the staff closes the two grippers 303 in time to close the butterfly plate 101, in order to facilitate the closing of the butterfly plate 101, the stop block 206 is positioned between the two grippers 303 to limit and fix them. At this time, the drive rod 203 can be moved by the loading mechanism. When the stop block 206 contacts the limiting rod 3032, since the limiting rod 3032 is rotatably connected to the rotating column 3031, and the housing 302 is equipped with a limiting pin 305 for limiting the rotating column 3031, when the stop block 206 pushes the limiting rod 3032, the limiting rod 3032 can be rotated. Then the stop block 206 can be easily inserted between the two limiting rods 3032, thereby completing the limiting operation of the drive rod 203 and providing convenience for the staff to reset the butterfly plate 101.

[0053] Example 5:

[0054] Reference Figures 1-14The spring-loaded pilot-operated self-operated relief valve is basically the same as in embodiment 4. Furthermore, the detection unit includes a low-pressure pilot valve 301, which is installed on the mounting frame 3. The two ends of the pressure tapping pipe 6 are connected to the low-pressure pilot valve 301 and the valve body 1, respectively. When the pressure tank is a low-pressure medium storage tank, the low-pressure pilot valve 301 can be used as the detection unit to ensure that when the low-pressure tank is storing medium, the butterfly plate 101 can be opened quickly after the pressure peak is reached, so that the force borne by the second tension spring 504 can be reduced as much as possible, reducing the overall strength of some of its structures and indirectly increasing the fatigue resistance of the remaining mating parts.

[0055] The detection unit includes a high-pressure pilot valve 307, which is mounted on the mounting frame 3. The two ends of the pressure tapping pipe 6 are connected to the high-pressure pilot valve 307 and the valve body 1, respectively. When the pressure tank is a high-pressure medium storage device, the high-pressure pilot valve 307 can be used as the detection unit. This allows the pressure transmitted from the pressure tank to the detection unit through the pressure tapping pipe 6 to be fully transmitted to the pilot valve piston assembly 4, thereby ensuring the sensitivity of the relief valve opening.

[0056] Example 6:

[0057] Reference Figures 1-14 The spring-loaded pilot-operated self-operated relief valve is basically the same as in embodiment 5, but further includes a rotating rod 7. The rotating rod 7 is rotatably connected to the pressure relief pipe connected to the valve body 1 on the pressure storage tank. Multiple blades 701 are fixedly connected to the rotating rod 7 at equal intervals around its circumference. The lower end of the drive cylinder 2 is fixedly connected to an air storage tank 8 via a connecting rod. An air cylinder 804 is connected to the air inlet of the air storage tank 8. A piston rod 805 with a piston is slidably connected inside the air cylinder 804. A rotating wheel 806 is installed at the lower end of the piston rod 805. A pressure relief pipe extends from the end of rod 7 near the air cylinder 804 and is fixedly connected to a crank 702 that abuts against the rotating wheel 806. One-way valves are installed in the air inlet and outlet of the air cylinder 804. An air outlet and an exhaust port are respectively opened on the air storage tank 8. A first solenoid valve and a second solenoid valve are respectively installed in the air outlet and exhaust port. An air supply pipe 809 is connected to the air outlet of the air storage tank 8. An air supply port is opened at the end of the drive cylinder 2 near the loading mechanism. The end of the air supply pipe 809 away from the air storage tank 8 is connected to the air supply port of the drive cylinder 2.

[0058] When the butterfly plate 101 opens to release the pressure in the pressure tank, the blade 701 rotates under the influence of the medium flowing out through the pressure relief pipe. This rotation, in turn, drives the crank 702 via the rotating rod 7. The crank 702, in conjunction with the rotating wheel 806, drives the piston rod 805 to move up and down within the gas cylinder 804, thus supplying gas to the gas storage tank 8 for storage. When the pressure in the pressure tank drops to a safe level, the pilot valve piston assembly 4 moves back to its original position, controlling the two grippers 303 to rotate and close. Because the rollers 306 on the grippers 303 roll on the gourd-shaped piston 402's arc surface, the rollers 306 have an upward tendency, and the tension spring 304 also exerts a pulling force on the grippers 303. Therefore, the rollers 306 exert a significant downward force on the gourd-shaped piston 402, thus controlling the pilot valve piston assembly 4 to slowly move upward. The grippers 303 will also close slowly. During the closing process of the two grippers 303, the first solenoid valve can be opened. Then the gas in the gas storage tank 8 will be transported into the drive cylinder 2 through the gas supply pipe 809. As the gas pressure in the drive cylinder 2 continues to increase, the sliding cylinder 202 will overcome the elastic force of the first tension spring 201 and drive the drive rod 203 to move. Then the drive rod 203 will drive the stop block 206 to move towards one end of the gourd-shaped piston 402. Thus, before the two grippers 303 are fully engaged, the stop block 206 can be positioned between the two grippers 303. When the two grippers 303 are fully engaged, the stop block 206 can be limited, so that the butterfly plate 101 is in the closed normal state. By controlling the drive rod 203 to move automatically, the butterfly plate 101 can be closed automatically. There is no need for the operator to manually move the drive rod 203 through the loading mechanism, which effectively improves the automation of the relief valve.

[0059] Example 7:

[0060] Reference Figures 1-14 The spring-loaded pilot-operated self-operated relief valve is basically the same as in embodiment 6. However, a fixed sleeve 507 is fixedly connected to the lower end of the mounting cylinder 501, and a push rod 506 is fixedly connected to the lower end of the upper spring seat 502. The push rod 506 extends downward through the lower spring seat 503 and the adjusting screw 505. A pressure sensor 508 is fixedly connected to the lower end inside the fixed sleeve 507. An adjusting plate 807 is rotatably connected inside the air storage tank 8. The air storage tank 8 is divided into a first air chamber 801, a second air chamber 802, and a third air chamber 803 by the adjusting plate 807. A vent is provided on the adjusting plate 807, and a first solenoid valve is installed inside the vent. The air supply pipe 809 and the second solenoid valve are both located on the side of the air storage tank 8 near the second air chamber 802. A motor 808 is installed on the air storage tank 8, and the output end of the motor 808 is fixedly connected to the adjusting plate 807. A whistle 8010, which communicates with the third air chamber 803, is fixedly connected to the air storage tank 8.

[0061] When the detection unit detects an increase in pressure inside the pressure tank, it controls the pilot valve piston assembly 4 to move downwards. Then, the gripper 303 unfolds under the tension of the tension spring 304, releasing the stop block 206. The drive rod 203 then returns to its original position under the tension of the first tension spring 201, allowing the butterfly plate 101 to open via the rotating plate 205, causing the medium inside the pressure tank to flow out and releasing the pressure. When the pilot valve piston assembly 4 moves downwards, it applies pressure to the upper spring seat 502. The upper spring seat 502 overcomes the elastic force of the second tension spring 504, causing the abutment rod 506 to move downwards. When the pilot valve piston assembly 4 moves downwards, causing the gripper 303 to separate from the stop block 206, the abutment rod 506 abuts against the pressure sensor 508. Then, the external controller can determine that the butterfly plate 101 has opened based on the pressure value transmitted from the pressure sensor 508. After the pressure in the pressure tank drops to the safe pressure value, the second tension spring 504 will drive the pilot valve piston assembly 4 and the abutment rod 506 upwards via the upper spring seat 502. When the stop rod 506 separates from the pressure sensor 508, the value detected by the pressure sensor 508 will become zero. The main controller will then know that pressure release has been completed. The controller can then control the motor 808 to rotate the adjusting plate 807 by a certain angle. Next, it can control the first solenoid valve to open, and the gas stored in the first air chamber 801 will enter the second air chamber 802. The gas will then be delivered into the drive cylinder 2 through the air supply pipe 809. As the air pressure in the drive cylinder 2 continuously increases, the sliding cylinder 202 will... The pressure overcomes the tension of the first tension spring 201, causing the drive rod 203 to move. The drive rod 203 then drives the driven rod 102 to rotate via the rotating plate 205, thereby automatically closing the butterfly plate 101. After the butterfly plate 101 is closed, the second solenoid valve can be opened, allowing the gas in the drive cylinder 2 and the second air chamber 802 to be discharged. When the pressure in the pressure tank increases again, the above operation will be repeated, and after the pressure is balanced, the butterfly plate 101 can be automatically closed again.

[0062] After repeating the above operations multiple times, it becomes clear that a component inside the pressure tank may be damaged, causing the pressure inside the tank to continuously increase. Figure 14As shown, the space of the second air chamber 802 is larger than that of the third air chamber 803. Therefore, when the adjusting plate 807 rotates, the air vent of the adjusting plate 807 can be positioned in the second air chamber 802 after multiple rotations. When the air vent of the adjusting plate 807 rotates into the third air chamber 803, the gas stored in the first air chamber 801 will be directly discharged through the air outlet of the third air chamber 803 when the first solenoid valve is opened. This prevents the gas from entering the drive cylinder 2 to control the movement of the drive rod 203, thus ensuring that the butterfly plate 101 is in the normally open state. Then, the medium in the pressure tank will be discharged through the pressure relief pipe, and the whistle 8010 will emit a sound under the action of the discharged gas, thereby reminding the staff to come and inspect the pressure tank.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention.

Claims

1. A spring-loaded pilot-operated self-operated relief valve, comprising a valve body (1), wherein a butterfly plate (101) is rotatably connected within the valve body (1) via a driven rod (102), characterized in that, Also includes: A drive cylinder (2) is disposed above the valve body (1) and is connected to the valve body (1) through a sleeve (103). The driven rod (102) is located inside the sleeve (103) and extends upward into the drive cylinder (2). A drive rod (203) is disposed inside the drive cylinder (2); A rotating plate (205) is fixedly connected to one end of the driven rod (102) located inside the drive cylinder (2); An adjusting column (204) is fixedly connected to the drive rod (203), and a groove is provided on the rotating plate (205) to cooperate with the adjusting column (204); The stop block (206) is fixedly connected to one end of the drive rod (203) extending out of the drive cylinder (2); The sliding cylinder (202) is slidably connected inside the drive cylinder (2) and fixedly connected to the end of the drive rod (203) away from the stop (206); The first tension spring (201) is sleeved on the drive rod (203), and the two ends of the first tension spring (201) are fixedly connected to the drive cylinder (2) and the sliding cylinder (202) respectively. A loading mechanism for loading the first tension spring (201) is mounted on the drive cylinder (2); The shift fork assembly for tightening the first tension spring (201) is mounted on the side of the drive cylinder (2) near the stop (206) via the mounting frame (3); The control mechanism for controlling the opening and closing of the shift fork assembly is installed in the mounting frame (3). The pressure detection end of the control mechanism is connected to the medium inlet side of the valve body (1) through the pressure tapping pipe (6).

2. The spring-loaded pilot-operated self-operated relief valve according to claim 1, characterized in that, The loading mechanism includes a lead screw (207) and a handwheel. The lead screw (207) is threadedly connected to the end of the drive cylinder (2) away from the mounting frame (3), and the handwheel is fixedly connected to the lead screw (207).

3. The spring-loaded pilot-operated self-operated relief valve according to claim 1, characterized in that, The loading mechanism includes a manual hydraulic cylinder (208), which is fixedly connected to the drive cylinder (2) on the side near the sliding cylinder (202). The manual oil injection component in the manual hydraulic cylinder (208) is installed on the outside of the drive cylinder (2).

4. The spring-loaded pilot-operated self-operated relief valve according to claim 1, characterized in that, The shift fork assembly includes a housing (302), a gripper (303), and a tension spring (304). The housing (302) is installed in the mounting frame (3) on the side near the stop (206). The gripper (303) is symmetrically connected to the side of the housing (302) away from the stop (206) via a pivot. The two ends of the tension spring (304) are respectively connected to the housing (302) and the gripper (303).

5. The spring-loaded pilot-operated self-operated relief valve according to claim 4, characterized in that, The control mechanism includes a detection unit, a pilot valve piston assembly (4), and a spring assembly (5). The detection unit is connected to the valve body (1) through a pressure tapping pipe (6) and is used to detect the pressure in the pressure tank. The pilot valve piston assembly (4) works in conjunction with a tension spring (304) to control the opening or closing of the gripper (303). The spring assembly (5) is used to control the reset of the pilot valve piston assembly (4).

6. The spring-loaded pilot-operated self-operated relief valve according to claim 5, characterized in that, The detection unit includes a low-pressure pilot valve (301), which is mounted on the mounting frame (3). The two ports of the pressure tapping pipe (6) are connected to the low-pressure pilot valve (301) and the valve body (1), respectively.

7. The spring-loaded pilot-operated self-operated relief valve according to claim 5, characterized in that, The detection unit includes a high-pressure pilot valve (307), which is mounted on the mounting frame (3). The two ports of the pressure tapping pipe (6) are connected to the high-pressure pilot valve (307) and the valve body (1), respectively.

8. The spring-loaded pilot-operated self-operated relief valve according to claim 6 or 7, characterized in that, The pilot valve piston assembly (4) includes an upper valve stem (401), a gourd-shaped piston (402), and a lower valve stem (403). The upper and lower ends of the gourd-shaped piston (402) are connected to the upper valve stem (401) and the lower valve stem (403) respectively. The upper valve stem (401), the gourd-shaped piston (402), and the lower valve stem (403) connected as a whole are vertically slidably connected to the mounting frame (3). The end of the gripper (303) near the gourd-shaped piston (402) is rotatably connected to a roller (306). The roller (306) rolls on the gourd surface of the gourd-shaped piston (402). The upper end of the upper valve stem (401) is connected to a low-pressure pilot valve (301) or a high-pressure pilot valve (307). The lower end of the lower valve stem (403) is connected to a spring assembly (5).

9. The spring-loaded pilot-operated self-operated relief valve according to claim 8, characterized in that, The spring assembly (5) includes a mounting cylinder (501), an upper spring seat (502), a lower spring seat (503), a second tension spring (504), and an adjusting screw (505). The mounting cylinder (501) is mounted on the lower end of the mounting frame (3). The upper spring seat (502) is fixedly mounted on the lower end of the lower valve stem (403). The adjusting screw (505) is threadedly connected to the lower end of the mounting cylinder (501). The lower spring seat (503) is fixedly mounted on the upper end of the adjusting screw (505). The two ends of the second tension spring (504) are respectively connected to the upper spring seat (502) and the lower spring seat (503).

10. The spring-loaded pilot-operated self-operated relief valve according to claim 9, characterized in that, It also includes a rotating rod (7), which is rotatably connected to the pressure relief pipe connected to the valve body (1) on the pressure storage tank. Multiple blades (701) are fixedly connected to the rotating rod (7) at equal intervals around its circumference. An air storage tank (8) is fixedly connected to the lower end of the drive cylinder (2) via a connecting rod. An air cylinder (804) is connected to the air inlet of the air storage tank (8). A piston rod (805) with a piston is slidably connected inside the air cylinder (804). A rotating wheel (806) is installed at the lower end of the piston rod (805). The rotating rod (7) is located near the air cylinder (804). The end extends out a pressure relief pipe and is fixedly connected to a crank (702) that abuts against the rotating wheel (806). One-way valves are installed in the inlet and outlet of the air cylinder (804). An outlet and an exhaust port are respectively opened on the air storage tank (8). A first solenoid valve and a second solenoid valve are respectively installed in the outlet and exhaust port. An air supply pipe (809) is connected to the outlet of the air storage tank (8). An air supply port is opened at the end of the drive cylinder (2) near the loading mechanism. The end of the air supply pipe (809) away from the air storage tank (8) is connected to the air supply port of the drive cylinder (2).

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