A multi-stage pilot quick-opening valve

Abstract

This application relates to the field of valve technology, and in particular to a multi-stage pilot-operated quick-opening valve, comprising a main valve body, a first-stage pilot valve, a second-stage pilot valve, and a drive assembly for sliding the valve stem of the first-stage pilot valve. The main valve body has three chambers: an inlet, an outlet, and a central cavity. The inlet and outlet of the main valve body are vertically arranged, and the inlet and outlet of the main valve body achieve the cutoff or flow of the system pipeline medium through a sliding valve disc. The central cavity of the main valve body is connected and fixedly connected to the inlet of the second-stage pilot valve, forming a chamber that serves as a pressure chamber for actuating the valve disc of the main valve body. Both the first-stage and second-stage pilot valves have three chambers: an inlet, an outlet, and a central cavity. The inlet and outlet of the main valve body are vertically arranged, and valve discs slide within the internal cavities of both the first-stage and second-stage pilot valves to control the flow of the medium. The internal cavity of the first-stage pilot valve is provided with an elastic element for keeping the valve disc of the first-stage pilot valve in a closed state. This application has the function of regulating and controlling the flow and cutoff time of the medium.

Description

Technical Field

[0001] This application relates to the field of fluid machinery technology, and in particular to a multi-stage pilot-operated quick-opening valve. Background Technology

[0002] Pilot valves are generally used as safety valves where the set pressure and working pressure are close. They are suitable for various media such as gas, water, and oil.

[0003] Existing pilot-operated valves include a main valve and a pilot valve installed at the inlet of the main valve body. These pilot safety valves are primarily right-angled, with the inlet below the valve disc. The medium is guided through the pilot valve to the area above the valve disc. Because the force-bearing area above the valve disc is greater than that below, the higher the medium pressure, the better the sealing effect at the valve seat. This type of pilot valve is suitable for safe pressure relief applications where the opening pressure is close to the operating pressure. The operating principle of this type of pilot valve is that when the pilot valve opens, it discharges the medium above the main valve disc, thereby relieving pressure in the pressure chamber above the valve disc. When the force above the valve disc is lower than the force below, the valve disc actuates, opening the valve and allowing medium flow, thus protecting the system. This valve is an automatic valve.

[0004] The inventors believe that the above-mentioned pilot valve is only suitable for the overpressure safety relief function of the system pipeline. The improved multi-stage quick-opening pilot valve can not only realize automatic safety relief, but also realize the quick opening function, the remote operation and control function, and the valve opening and closing time can be adjusted and controlled. Summary of the Invention

[0005] To achieve integrated functions such as overpressure safety relief, rapid opening, remote control, and controllable valve opening and closing time in the system pipeline, this application provides a multi-stage pilot-operated quick-opening valve. The multi-stage pilot-operated quick-opening valve provided in this application adopts the following technical solution:

[0006] A multi-stage pilot-operated quick-opening valve includes a main valve body, a first-stage pilot valve, a second-stage pilot valve, and a drive assembly for sliding the valve stems of the first-stage and second-stage pilot valves.

[0007] The main valve body has three chambers: an inlet, an outlet, and a middle chamber. The inlet and outlet of the main valve body are vertically arranged. The inlet and outlet of the main valve body are connected to the inlet of the secondary pilot valve and fixedly connected to form a chamber, which serves as a pressure chamber to actuate the valve disc of the main valve body.

[0008] The first-stage pilot valve has three chambers: an inlet, an outlet, and a middle chamber. The inlet and outlet of the main valve body are vertically arranged. The inlet and outlet of the first-stage pilot valve are cut off by a sliding valve disc. The first-stage pilot valve is connected to the second-stage pilot valve.

[0009] The secondary pilot valve has three chambers: an inlet, an outlet, and a central chamber. The inlet and outlet of the second pilot valve achieve the cutting off or flow of the medium through the left and right movement of the valve disc, so as to realize the opening or closing of the main valve. The inlet of the primary pilot valve is connected and fixedly connected to the central chamber of the secondary pilot valve. The inlet of the primary pilot valve and the central chamber of the secondary pilot valve form a chamber, which serves as a pressure chamber to cause the secondary pilot valve to operate.

[0010] The inner cavity of the first-stage pilot valve is provided with an elastic element for keeping the valve disc of the first-stage pilot valve in a closed state.

[0011] By adopting the above technical solution, the pilot valve is installed in the system pipeline. When media needs to be transferred, the drive assembly is activated, which moves the pilot valve of the first-stage pilot valve to open the valve disc. The media in the inlet of the first-stage pilot valve and the middle cavity of the second-stage pilot valve are discharged from the outlet of the first-stage pilot valve, causing a decrease in the pressure in the middle cavity of the second-stage pilot valve. As the force on the valve disc of the second-stage pilot valve away from the opening of the second-stage pilot valve decreases, the valve disc of the second-stage pilot valve moves towards the pressure relief side of the middle cavity, thereby opening the second-stage pilot valve. The media in the inlet of the second-stage pilot valve and the middle cavity of the main valve are discharged to the outlet of the second-stage pilot valve, causing the media pressure in the middle cavity of the main valve to decrease as the media is discharged. When the force on the upper end of the main valve disc is lower than the force on the lower end, it moves upward, thereby opening the flow path of the main valve and realizing the flow of the pipeline. When the drive assembly is closed, the spring force in the first-stage pilot valve overcomes the pressure of the media on the valve disc of the first-stage pilot valve. When force is applied, the first-stage pilot valve disc moves downward and contacts and seals against the first-stage pilot valve seat, preventing the medium in the second-stage pilot valve cavity from being discharged to the outlet of the first-stage pilot valve. As the medium increases, the pressure in the second-stage pilot valve cavity rises, pushing the second-stage pilot valve disc towards the outlet until it closes. The second-stage pilot valve stops discharging pressure to the outlet, and the medium is blocked in the main valve cavity, causing the force above the main valve disc to increase. When it exceeds the medium force below the main valve disc, the main valve disc moves downward until it closes and seals, achieving the system pipeline cutoff function. When the system overpressures to the set pressure, the medium force at the lower end of the first-stage pilot valve disc overcomes the spring force at the upper end of the disc, opening the valve. According to the above-mentioned action linkage, the main valve disc eventually moves upward and opens, allowing the first-stage and second-stage pilot valves to discharge medium into designated spaces to relieve pressure, and the main valve to discharge medium downstream to relieve pressure, thereby achieving the system protection function.

[0012] Optionally, the inlet flow channel of the main valve body is configured in a streamlined serpentine shape.

[0013] By adopting the above technical solution, the medium entering the inlet flow channel of the main valve body is guided so that the medium flows in a straight line between the inlet and outlet as much as possible, so as to reduce the flow resistance during discharge and reduce the impact between the medium and the inner wall of the main valve body and the main valve guide sleeve, thereby making the medium flow more smoothly. Furthermore, setting the inlet flow channel and the outlet flow channel to be perpendicular makes it more convenient to install the quick-opening valve in a vertically arranged pipeline.

[0014] Optionally, the drive assembly includes a support rod fixed on the first-stage pilot valve bracket, a lever connected to the end of the support rod by a pin, and an electromagnetic force controller fixed on the first pilot valve bracket. When energized, the electromagnetic force controller generates a pulling force to drive one end of the lever to swing up and down. The lever is fixedly connected to the valve stem of the first pilot valve. When the lever swings up and down, it can drive the valve stem to move up and down.

[0015] By adopting the above technical solution, the electromagnetic force controller is electrically connected to an external power source. When powered on, the electromagnetic force controller is activated, and the electromagnetic force controller generates a pulling force that drives the lever to swing upward. This causes the lever to drive the valve stem of the first-stage pilot valve to move upward. When the valve stem moves upward, the elastic element counteracts the force of the spring acting on the valve disc of the first-stage pilot valve, allowing the valve disc of the first-stage pilot valve to move upward under the force of the medium, thereby opening the first-stage pilot valve.

[0016] Optionally, an adjustable spherical contact pin is provided between the lever and the electromagnetic tension controller, and an adjusting bolt is provided between the first-stage pilot valve spring and the first-stage pilot valve cover.

[0017] By adopting the above technical solution, the contact between the tensioner and the lever can be adjusted by using a spherical contact pin and installed in the electromagnetic tension controller. At the same time, the spherical contact can automatically align the force point. The force above the valve disc of the first-stage pilot valve can be adjusted by adjusting the height of the spring by adjusting the adjusting bolt between the first-stage pilot valve spring and the first-stage pilot valve cover. The automatic opening force of the first-stage pilot valve can be precisely controlled to achieve the overpressure protection function.

[0018] Optionally, the main valve body has an inlet flow channel hole and an outlet flow channel hole on its side wall, the inlet flow channel hole and the outlet flow channel hole are connected, the main valve body is hollow, and the main valve body is provided with a main valve disc and a main valve seat for cutting off the outlet flow channel hole and the inlet flow channel hole. The inner wall of the main valve body is provided with a fixed main valve guide sleeve, and the upper end of the main valve disc is provided with a main valve spring. The main valve disc is hollow, and the two ends of the main valve spring are fixed to the bottom wall of the main valve disc and the main valve guide sleeve respectively by spring seats.

[0019] By adopting the above technical solution, the flow and cut-off functions of the medium in the system pipeline can be realized through the main valve disc and main valve seat inside the main valve. When there is medium at the inlet, the medium force above the main valve disc is greater than the force below the main valve disc, and the main valve can be in the closed state. The main valve body and the main valve disc are hollow, which can form a pressure chamber at the upper end of the main valve disc. When the pressure chamber is suddenly depressurized due to the discharge of medium in the chamber by the pilot valve, the force at the lower end of the main valve disc is greater than the force at the upper end of the main valve disc, the valve disc moves upward, the main valve opens, and the flow of the system medium is realized. The inner wall of the main valve body is provided with a fixed main valve guide sleeve, the surface is smoothly processed and made of wear-resistant material, so as to guide the main valve disc to move more stably, and at the same time control the stroke of the main valve disc moving upward. A spring is provided at the upper end of the main valve disc, which can make the main valve disc easy to seal when the medium in the flow channel is at low pressure, and at the same time reduce the impact when the main valve disc moves upward.

[0020] Optionally, a limiting groove is formed on the inner wall of the main valve body. The limiting groove is located at the junction of the outlet flow channel hole and the inlet flow channel hole. A main valve seat is provided on the inner wall of the limiting groove. A limiting step is formed on the main valve seat. A restraining ring is embedded and fixed on the inner wall of the limiting groove. A snap-fit ​​groove is formed on the side wall of the limiting groove. A four-opening ring is snap-fitted and fixed on the inner wall of the snap-fit ​​groove. A pressure plate is snap-fitted and fixed on the inner wall of the limiting groove. The pressure plate is pressed against the upper end of the limiting step of the main valve seat. The pressure plate is located on the side of the four-opening ring away from the restraining ring. A locking pin is pressed onto the pressure plate. The locking pin is threadedly connected to the restraining ring. A main valve guide sleeve is fixed at the upper end of the pressure plate. The lower end of the main valve disc contacts the upper end of the main valve seat to form a medium flow cut-off surface.

[0021] By adopting the above technical solutions, the main valve seat can be disassembled online, facilitating the repair of the main valve seat sealing surface; the restraining ring avoids the difficulty of machining threaded holes on deep hole steps, and high-strength materials can be used to meet the restraining force; the limit locking groove allows for easy installation of a four-ring to fix the restraining ring, preventing it from moving upwards; the step on the main valve seat can be pressed down by a pressure plate and locking pin and connected to the restraining ring, fixing the main valve seat to the main valve body, while achieving a static seal at the contact point between the main valve seat and the bottom of the main valve body; and the bottom of the main valve guide sleeve blocks the locking pin to prevent it from moving upwards due to vibration.

[0022] Optionally, the portion where the main valve guide sleeve intersects with the main valve body flow channel is configured as three windows. An anti-rotation shaft is provided between the main valve body and the main valve guide sleeve so that one of the windows on the main valve guide sleeve is connected to and fixed relative to the inlet of the main valve body.

[0023] By adopting the above technical solution, the contact area between the main valve guide sleeve and the main valve disc can be reduced, the guiding friction can be reduced, and the impact of the main valve guide sleeve on the medium flow capacity can be reduced.

[0024] Optionally, a boss is provided at the bottom of the main valve body to serve as a sealing contact between the main valve seat and the main valve body. The contact surface between the main valve seat and the main valve disc is provided with a hardened sealing surface.

[0025] By adopting the above technical solution, the design of the boss can better grind the boss sealing surface and improve its sealing performance; the contact surface between the main valve seat and the main valve disc is made of hard alloy welding and a hardness difference is left to prevent damage to the sealing surface caused by the impact when the quick-opening valve closes quickly, which would lead to sealing leakage. This can extend the service life of the valve and reduce the number of disassembly and maintenance.

[0026] Optionally, a main valve cover is fixed to the upper end of the central cavity of the main valve body. A positioning groove is formed on the inner wall of the main valve body, and a guide surface is formed on the outer wall of the main valve body. A sealing ring is provided between the inner wall of the main valve body and the main valve cover. The sealing ring is wedge-shaped, and the outer wall of the sealing ring fits against the guide surface. The inner wall and guide surface of the sealing ring fit against the outer wall and guide surface of the main valve cover. A pressure ring is installed on the inner wall of the main valve body, and the upper wall of the sealing ring fits against the pressure ring. A limiting ring is installed on the inner wall of the main valve body. The limiting ring is engaged with the inner wall of the main valve body, and the upper end of the limiting ring abuts against the pressure ring. The inner wall of the limiting ring abuts against the outer wall of the main valve cover.

[0027] By adopting the above technical solution, after the main valve cover is installed on the inner wall of the main valve body, a wedge-shaped sealing ring is installed on the guide surface of the main valve cover, and the sealing ring is fixed with a pressure ring to prevent the sealing ring from moving upward. A limiting ring is inserted into the positioning groove to prevent the pressure ring from moving upward. This structure can achieve that the higher the medium pressure, the greater the force that pushes the main valve cover to move upward, thereby increasing the sealing force between the main valve cover and the sealing ring, and between the sealing ring and the valve body, and thus improving the sealing effect.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. This multi-stage quick-opening pilot valve is designed with a pilot-operated structure. In terms of the design of the valve disc structure and the direction of medium flow, this multi-stage pilot valve can achieve better valve disc sealing effect as the medium pressure increases, thus better realizing the integrity of the pipeline system.

[0030] 2. When this multi-stage quick-opening valve is welded to the pipeline, the valve needs to be disassembled and inspected regularly. The valve seat is designed with a detachable structure, which can realize the disassembly and inspection of the valve seat.

[0031] 3. Due to the multi-stage pilot design, by adjusting the inlet flow channel size and throat size of the first-stage and second-stage pilot valves, the opening and closing time of the main valve can be indirectly and precisely controlled to meet the operating requirements.

[0032] 4. The first-stage pilot valve is designed with a spring as the closing force. Through precise spring design and adjusting bolts, the first-stage pilot valve can be controlled to open automatically when needed, so as to realize the overpressure protection function of the valve or system.

[0033] 5. An electromagnetic force controller is used as the operating mechanism of the first-stage pilot valve, which can realize remote control of the operation of the multi-stage quick-opening pilot valve, and at the same time realize the rapid opening and closing of the multi-stage pilot quick-opening valve to meet the working conditions.

[0034] 6. By employing the rapid response capability of the electromagnetic force controller, the valve can be opened quickly to meet the needs of operating conditions requiring rapid valve opening. Attached Figure Description

[0035] Figure 1 This is a cross-sectional view of the quick-opening valve in an embodiment of this application, used to show the structure inside the quick-opening valve cavity.

[0036] Figure 2 yes Figure 1 The enlarged view at point A shows the connection of the sealing ring at the main valve cover.

[0037] Figure 3 yes Figure 1 The enlarged view at point B shows the connection between the main valve seat and the main valve body.

[0038] Reference numerals: 1. Main valve body; 2. Main valve cover; 3. Inlet flow channel hole; 4. Outlet flow channel hole; 5. Elastic element; 6. Secondary pilot valve; 7. Primary pilot valve; 8. Drive assembly; 9. Support rod; 10. Lever; 11. Electromagnetic pull controller; 12. Main valve guide sleeve; 13. Main valve disc; 14. Main valve spring; 15. Spring seat; 16. Limiting groove; 17. Main valve seat; 18. Restriction ring; 19. Snap-fit ​​groove; 20. Four-way open ring; 21. Pressure plate; 22. Locking pin; 23. Pressure ring; 26. Guide surface; 27. Sealing ring; 28. Limiting ring; 30. Fixing groove. Detailed Implementation

[0039] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0040] This application discloses a multi-stage pilot-operated quick-opening valve.

[0041] Reference Figure 1 and Figure 2A multi-stage pilot-operated quick-opening valve includes a main valve body 1 and a main valve cover 2. The main valve body 1 is hollow. A guide surface 26 is provided on the outer wall of the main valve cover 2. A fixing groove 30 is provided on the inner wall of the main valve body 1. A limit ring 28 is fixedly engaged on the inner wall of the fixing groove 30. A sealing ring 27 is used to perform the sealing function between the main valve body 1 and the main valve cover 2. The guide surface 26 of the sealing ring 27 fits against the guide surface 26 of the main valve cover 2. The inner wall of the main valve body 1 abuts against the outer wall of the sealing ring 27. The upper part of the sealing ring 27 is limited by a pressure ring 23. The pressure ring 23 is fixed by the limit ring 28 embedded in the valve body. When the medium pressure pushes the main valve cover 2 to move upward, the sealing effect of the sealing ring 27 between the main valve cover 2 and the inner wall of the main valve body 1 is better.

[0042] Reference Figure 1 and Figure 2 When the workers install the main valve cover 2 on the inner wall of the main valve body 1, they first insert the main valve cover 2 into the inner cavity of the main valve body 1, then insert the sealing ring 27 into the guide surface 26 of the main valve cover 2, fix the pressure ring 23 on top of the sealing ring 27, install four limit rings 28 in the fixing groove 30 on the inner wall of the main valve body 1, fix the cover on the main valve body 1, and use bolts and nuts to lift the main valve cover 2 upward until it is in close contact with the sealing ring 27.

[0043] Reference Figure 1 The main valve body 1 has an inlet flow channel hole 3 on one side and an outlet flow channel hole 4 on the other side. The inlet flow channel hole 3 and the outlet flow channel hole 4 are connected. The centerline of the inlet flow channel hole 3 is perpendicular to the centerline of the outlet flow channel hole 4. The inner cavity of the inlet flow channel hole 3 is serpentine, curving towards the inner cavity of the outlet flow channel hole 4. The medium enters through the inlet flow channel hole 3 and flows out through the outlet flow channel hole 4 under the guidance of the inner wall of the inlet flow channel hole 3. Setting the inlet flow channel hole 3 in a serpentine shape can reduce the impact between the medium and the inner wall of the main valve body 1, and reduce the impact between the medium and the inner wall of the main valve body 1 and the main valve guide sleeve 12, thereby making the flow of the medium smoother.

[0044] Reference Figure 1 and Figure 3A limiting groove 16 is formed on the inner wall of the outlet flow channel hole 4. The limiting groove 16 is formed along the height direction of the outlet flow channel hole 4 and is stepped. In this application, the limiting groove 16 has two steps. A snap-fit ​​groove 19 is formed on the inner wall of the limiting groove 16. A main valve seat 17 is snapped onto the step of the limiting groove 16 near the center of the outlet flow channel hole 4. A restraining ring 18 is snapped onto the second step of the limiting groove 16. A four-opening ring 20 is snapped and fixed on the inner wall of the snap-fit ​​groove 19. A pressure plate 21 is snapped onto the side of the four-opening ring 20 away from the restraining ring 18. Holes are formed through the side walls of both the pressure plate 21 and the four-opening ring 20. A threaded hole is formed on the side wall of the restraining ring 18. The restraining ring 18 eliminates the difficulty of machining threaded holes in deep holes. Under the constraints of the pressure plate 21, the four-ring 20 and the restraining ring 18, the main valve seat 17 is detachably fixed to the inner wall of the main valve body 1.

[0045] Reference Figure 1 and Figure 3 When the operator installs the main valve seat 17 onto the main valve body 1, a retaining ring 18 is first inserted between the limiting groove 16 and the inner wall of the main valve body 1. Then, a four-ring 20 is engaged in the locking groove 19. Subsequently, the main valve seat 17 is inserted into the limiting groove 16, and a pressure plate 21 is inserted between the outer wall of the main valve seat 17 and the inner wall of the main valve body 1. The locking pin 22 passes through the pressure plate 21 and the four-ring 20 and is threadedly connected to the retaining ring 18, thereby achieving the locking of the main valve seat 17. When the main valve seat 17 needs to be disassembled, the locking pin 22 is released, and the pressure plate 21 and locking pin 22 are taken out in sequence, so that the main valve seat 17 can be removed from the main valve body 1, which is convenient for the staff to carry out maintenance. The four-ring 20 and the restraining ring 18 play a role in restricting the locking pin 22, thereby making the main valve seat 17 more stable. Moreover, this detachable connection between the main valve seat 17 and the main valve body 1 facilitates subsequent maintenance and other operations by the staff.

[0046] Reference Figure 1 and Figure 3 The main valve body 1 has a main valve guide sleeve 12 fixed on its inner wall. The main valve guide sleeve 12 contains a main valve disc 13. The inlet and outlet of the main valve body 1 can be connected by the sliding main valve disc 13 to cut off or allow the system pipeline medium to flow when needed. The contact surfaces of the main valve disc 13 and the main valve seat 17 are hardened, thereby improving the sealing performance and impact resistance of the main valve disc 13 and the main valve seat 17.

[0047] Reference Figure 1 and Figure 3A main valve guide sleeve 12 is fixed to the inner wall of the main valve body 1 by a four-ring 20. A main valve disc 13 for sealing the inlet of the outlet flow channel hole 4 is provided on the inner wall of the main valve guide sleeve 12. The main valve disc 13 slides within the main valve guide sleeve 12. A main valve spring 14 is installed on the main valve disc 13, and its two ends are respectively engaged and fixed to the main valve disc 13 and the main valve guide sleeve 12 by spring seats 15. When the medium enters the main valve body 1, the medium passes through the gap and enters above the main valve disc 13. The medium above the main valve disc 13 presses against the main valve disc 13 to achieve a seal between the main valve disc 13 and the main valve seat 17. When the medium in the upper chamber of the main valve body 1 and the main valve disc 13 is discharged by the pilot valve and the pressure decreases, the main valve disc 13 opens upward to allow the outlet flow channel 4 to flow. At this time, the main valve spring 14 is compressed. The setting of the main valve spring 14 gives the main valve disc 13 a certain buffer.

[0048] Reference Figure 1 The part where the main valve guide sleeve 12 intersects with the flow channel is designed in the form of three windows. One window is aligned with the inlet flow channel of the main valve body 1, which reduces the guide contact surface with the main valve disc 13 while ensuring that the flow capacity of the medium is not affected. An anti-rotation shaft is set to fix the main valve guide sleeve 12 to the main valve body 1 and prevent the circumferential movement of the main valve guide sleeve 12.

[0049] Reference Figure 1 A secondary pilot valve 6 is fixed to the side wall of the main valve cover 2 by bolts. The inlet of the secondary pilot valve 6 is connected to the middle cavity of the main valve cover 2. The middle cavity of the secondary pilot valve 6 is fixedly connected to the primary pilot valve 7 by bolts. In this application, one secondary pilot valve 6 is provided. Several secondary pilot valves 6 can be provided according to the actual situation. When the main valve needs to be opened, the drive assembly 8 on the first-stage pilot valve 7 is controlled to drive the valve stem of the first-stage pilot valve 7 to move upward, opening the valve disc of the first-stage pilot valve 7. The medium between the inlet of the first-stage pilot valve 7 and the middle cavity of the second-stage pilot valve 6 is discharged from the outlet of the first-stage pilot valve 7. As the force on the valve disc of the second-stage pilot valve 6 towards the inlet side of the first-stage pilot valve 7 decreases, the valve disc of the second-stage pilot valve 6 moves towards the pressure relief side of the middle cavity, thereby opening the second-stage pilot valve 6. The medium between the inlet of the second-stage pilot valve 6 and the middle cavity of the main valve is discharged to the outlet of the second-stage pilot valve 6, causing the medium pressure in the middle cavity of the main valve to decrease as the medium is discharged. When the force on the upper end of the main valve disc 13 is lower than the force on the lower end, it moves upward, thereby opening the main valve flow channel and realizing the flow of the pipeline.

[0050] Reference Figure 1The inner cavity of the first-stage pilot valve 7 is equipped with an elastic element 5. The elastic element 5 ensures that the valve disc of the first-stage pilot valve 7 is in the closed state. The valve stem of the first-stage pilot valve 7 passes through the elastic element 5. One end of the elastic element 5 abuts against the valve stem of the first-stage pilot valve 7 through the spring seat 15 and the adjusting screw, and the other end contacts the valve stem boss of the first-stage pilot valve 7 through the spring seat 15. One end of the valve stem of the first-stage pilot valve 7 contacts the valve disc of the first-stage pilot valve 7. The spring force is transmitted from the valve stem to the valve disc of the first-stage pilot valve 7, thereby keeping the first-stage pilot valve 7 in the closed state.

[0051] Reference Figure 1 The main valve body 1 and the secondary pilot valve 6 are fixed together by bolts. The middle cavity of the main valve body 1 and the inlet of the secondary pilot valve 6 form a chamber, which serves as the pressure chamber for powering the main valve disc 13. The inlet and outlet of the secondary pilot valve 6 are connected by a valve disc that can move left and right, which can be cut off or allowed to flow when needed, thereby controlling the change in medium pressure required for the main valve disc 13 to operate, and thus controlling the opening or closing of the main valve body 1. The first-stage pilot valve 7 and the second-stage pilot valve 6 are fixed together by bolts. The middle cavity of the secondary pilot valve 6 and the inlet of the first-stage pilot valve 7 form a chamber, which serves as the pressure chamber for activating the secondary pilot valve 6.

[0052] Reference Figure 1 The first-stage pilot valve 7 has two chambers, an inlet and an outlet. In this application, the inlet and outlet of the first-stage pilot valve 7 are in a vertical state. The inlet and outlet of the first-stage pilot valve 7 are connected by a valve disc that can move up and down to cut off or allow flow when needed, so as to control the change in medium pressure required for the valve disc of the second-stage pilot valve 6 to operate.

[0053] Reference Figure 1 A drive assembly 8 for lifting the valve stem of the first-stage pilot valve 7 is provided on the bracket. The drive assembly 8 includes a support rod 9 fixed on the bracket of the first-stage pilot valve 7, a lever 10 pin connected to the support rod 9, and an electromagnetic force controller 11 fixedly connected to the bracket of the first-stage pilot valve 7 by bolts. The lever 10 is fixed to the valve stem of the first-stage pilot valve 7 by a nut. The electromagnetic force controller 11 drives the lever 10 to swing upward, and the lever 10 drives the valve stem of the first-stage pilot valve 7 to move upward. The valve disc of the first-stage pilot valve 7 moves upward under the action of the medium, thereby opening the first-stage pilot valve 7 and discharging the medium.

[0054] Reference Figure 1 The valve stem of the first-stage pilot valve 7 and the electromagnetic force controller 11 are designed with an adjustable spherical contact pin. The contact point between the lever 10 and the pull rod of the electromagnetic force controller 11 can be adjusted by adjusting the spherical contact pin to achieve the adjustment of the force point.

[0055] The implementation principle of a multi-stage pilot-operated quick-opening valve in this application embodiment is as follows:

[0056] When the valve is installed in the system pipeline and is in normal working condition, the control room receives a request for pipeline flow and operates the drive assembly 8 to generate a pulling force, which drives the lever 10 to move upward. The lever 10 pulls the valve stem upward against the spring force, thereby opening the valve disc of the first-stage pilot valve 7. The medium in the inlet of the first-stage pilot valve 7 and the middle cavity of the second-stage pilot valve 6 is discharged from the outlet of the first-stage pilot valve 7, causing the pressure in the middle cavity of the second-stage pilot valve 6 to decrease. As the force on the valve disc of the second-stage pilot valve 6 towards the inlet side of the first-stage pilot valve 7 decreases, the valve disc of the second-stage pilot valve 6 moves towards the pressure relief side of the middle cavity, thereby opening the second-stage pilot valve 6. The medium in the inlet of the second-stage pilot valve 6 and the middle cavity of the main valve discharges the medium to the outlet of the second-stage pilot valve 6, causing the medium pressure in the middle cavity of the main valve to decrease as the medium is discharged. When the force on the upper end of the main valve disc 13 is lower than the force on the lower end, it moves upward, thereby opening the main valve flow channel and realizing pipeline flow. When the control room sends the shut-off drive assembly 8, the spring force in the first-stage pilot valve 7 overcomes the pressure on the valve disc 13. When the force generated by the valve disc of the first-stage pilot valve 7 is applied, the valve disc of the first-stage pilot valve 7 moves downward and comes into contact with the valve seat of the first-stage pilot valve 7 to seal, preventing the medium in the middle cavity of the second-stage pilot valve 6 from being discharged to the outlet of the first-stage pilot valve 7. As the medium increases, the pressure in the middle cavity of the second-stage pilot valve 6 increases, pushing the valve disc of the second-stage pilot valve 6 to move towards the outlet until it closes. The second-stage pilot valve 6 stops discharging pressure to the outlet, and the medium is blocked in the middle cavity of the main valve body 1, causing the force above the main valve disc 13 to increase. When it is greater than the medium force below the main valve disc 13, the main valve disc 13 moves downward until it closes and seals, realizing the cut-off function of the system pipeline. When the system overpressures to the set pressure, the medium force at the lower end of the valve disc of the first-stage pilot valve 7 overcomes the spring force at the upper end of the valve disc and opens the valve. According to the above-mentioned action linkage, the main valve disc 13 finally moves upward and opens. The first-stage pilot valve 7 and the second-stage pilot valve 6 discharge the medium into the designated space to relieve pressure, and the main valve discharges the medium downstream to relieve pressure, thereby realizing the protection function of the system.

[0057] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A multi-stage pilot-operated quick-opening valve, characterized in that: It includes a main valve body (1), a primary pilot valve (7), a secondary pilot valve (6), and a drive assembly (8) for sliding the valve stems of the primary pilot valve (7) and the secondary pilot valve (6); The main valve body (1) is provided with three chambers: inlet, outlet and middle chamber. The inlet and outlet of the main valve body (1) are arranged vertically. The inlet and outlet of the main valve body (1) are connected to the inlet of the secondary pilot valve (6) and fixedly connected to form a chamber, which serves as a pressure chamber to cause the valve disc of the main valve body (1) to move. The first-stage pilot valve (7) has three chambers: inlet, outlet and middle chamber. The inlet and outlet of the main valve body (1) are vertically arranged. The inlet and outlet of the first-stage pilot valve (7) are cut off by a sliding valve disc. The first-stage pilot valve (7) is connected to the second-stage pilot valve (6). The secondary pilot valve (6) has three chambers: inlet, outlet, and middle chamber. The inlet and outlet of the secondary pilot valve (6) are connected and fixedly connected to the middle chamber of the secondary pilot valve (6). The inlet of the primary pilot valve (7) and the middle chamber of the secondary pilot valve (6) form a chamber, which serves as a pressure chamber to activate the secondary pilot valve (6). The inner cavity of the first-stage pilot valve (7) is provided with an elastic element (5) for keeping the valve disc of the first-stage pilot valve (7) in a closed state. The main valve body (1) has an inlet flow channel hole (3) and an outlet flow channel hole (4) on its side wall. The inlet flow channel hole (3) and the outlet flow channel hole (4) are connected. The main valve body (1) is hollow. The main valve body (1) is provided with a main valve disc (13) and a main valve seat (17) for cutting off the outlet flow channel hole (4) and the inlet flow channel hole (3). The inner wall of the main valve body (1) is provided with a fixed guide sleeve (12). A limiting groove (16) is formed on the inner wall of the main valve body (1). The limiting groove (16) is located at the junction of the outlet flow channel hole (4) and the inlet flow channel hole (3). A main valve seat (17) is provided on the inner wall of the limiting groove (16). A limiting step is formed on the main valve seat (17). A restraining ring (18) is embedded and fixed on the inner wall of the limiting groove (16). A snap-fit ​​groove (19) is formed on the side wall of the limiting groove (16). A four-opening ring (20) is snap-fitted and fixed on the inner wall of the snap-fit ​​groove (19). A pressure plate (21) is fixedly fastened to the inner wall of the 6), the pressure plate (21) is pressed against the upper end of the limiting step of the main valve seat (17), the pressure plate (21) is located on the side of the four-open ring (20) away from the restraining ring (18), a locking pin (22) is pressed onto the pressure plate (21), the locking pin (22) is threadedly connected to the restraining ring (18), the upper end of the pressure plate (21) is fixed to the main valve guide sleeve (12), and the lower end of the main valve disc (13) contacts the upper end of the main valve seat (17) to form a medium flow cut-off surface.

2. The multi-stage pilot-operated quick-opening valve according to claim 1, characterized in that: The inlet flow channel of the main valve body (1) is configured as a streamlined serpentine shape.

3. A multi-stage pilot-operated quick-opening valve according to claim 1, characterized in that: The drive assembly (8) includes a support rod (9) fixed on the bracket of the first-stage pilot valve (7), a lever (10) connected to the end of the support rod (9) by a pin, and an electromagnetic force controller (11) fixed on the bracket of the first-stage pilot valve (7). The electromagnetic force controller (11) drives one end of the lever (10) to swing up and down. The lever (10) is fixedly connected to the valve stem of the first-stage pilot valve (7).

4. A multi-stage pilot-operated quick-opening valve according to claim 3, characterized in that: An adjustable spherical contact pin is provided between the lever (10) and the electromagnetic tension controller (11), and an adjusting bolt is provided between the first-stage pilot valve spring and the first-stage pilot valve cover.

5. A multi-stage pilot-operated quick-opening valve according to claim 1, characterized in that: A main valve spring (14) is provided at the upper end of the main valve disc (13). The main valve disc (13) is hollow. The two ends of the main valve spring (14) are fixed to the bottom wall of the main valve disc (13) and the guide sleeve (12) respectively by spring seats (15).

6. A multi-stage pilot-operated quick-opening valve according to claim 1, characterized in that: The portion where the main valve guide sleeve (12) intersects with the flow channel of the main valve body (1) is configured as three windows. An anti-rotation shaft is provided between the main valve body (1) and the main valve guide sleeve (12) so that one of the windows on the main valve guide sleeve (12) is connected to and fixed relative to the inlet of the main valve body (1).

7. A multi-stage pilot-operated quick-opening valve according to claim 1, characterized in that: The bottom of the main valve body (1) is provided with a boss as a sealing contact between the main valve seat (17) and the main valve body (1), and the contact surface between the main valve seat (17) and the main valve disc (13) is set as a hardened sealing surface.

8. A multi-stage pilot-operated quick-opening valve according to claim 1, characterized in that: The main valve body (1) has a main valve cover (2) fixed at the upper end of its central cavity. A positioning groove (25) is provided on the inner wall of the main valve body (1), and a guide surface (26) is provided on the outer wall of the main valve cover (2). A sealing ring (27) is provided between the inner wall of the main valve body (1) and the main valve cover (2). The sealing ring (27) is wedge-shaped, and its outer wall fits against the guide surface (26). The inner wall and wedge-shaped surface of the sealing ring are in contact with the outer wall and wedge-shaped surface of the main valve cover (2). A pressure ring is installed on the inner wall of the main valve body (1). The upper wall of the sealing ring is in contact with the pressure ring. A limit ring (28) is installed on the inner wall of the main valve body (1). The limit ring (28) is engaged with the inner wall of the main valve body (1). The limit ring (28) abuts against the upper end of the pressure ring. The inner wall of the limit ring (28) abuts against the outer wall of the main valve cover (2).

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