Ultrahigh-pressure pre-discharge type control valve

Abstract

The invention discloses an ultrahigh pressure pre-discharge type control valve, which belongs to the technical field of control valves, and comprises a lower flange, a main valve seat, an upper flange and a lower flange, a mounting seat is fixedly connected in the lower flange, the main valve seat is slidably sealed in the mounting seat through a mounting sleeve, and a cavity is formed in the main valve seat; the pre-release valve element is arranged in the cavity, an inner cavity is formed in the pre-release valve element, and a plurality of side pressure through holes are formed in the top of the inner cavity in a circumferential array mode. According to the pre-release valve element, a worker manually operates the rotating handle to drive the adjusting screw rod to rotate, the axial displacement of the adjusting screw rod is transmitted to the guide rod and the spring positioning seat through the sliding seat, the spring positioning seat moves upwards to adjust the pre-tightening compression force of the pre-release spring, and the pre-release opening pressure of the pre-release valve element is adjusted; the pre-relief pressure can be flexibly set according to actual working conditions, opening impact of an ultrahigh pressure system is avoided, and operation stability and sealing reliability of the control valve are improved.

Description

Technical Field

[0001] This invention belongs to the field of control valve technology, and particularly relates to an ultra-high pressure pre-venting control valve. Background Technology

[0002] In hydraulic systems, fluid transport systems, and high-pressure processing equipment, when the system needs to release pressure and drain fluid after being under high pressure and holding conditions, directly opening the main valve for large-flow pressure release will cause severe water hammer, pipeline vibration, and noise due to the instantaneous pressure change within the system. This will not only damage core components such as pipelines, seals, and valve cores, but may also lead to safety hazards such as seal failure and pipeline rupture, seriously affecting the operational stability and service life of the entire system. Ultra-high pressure pre-release control valves, as a core hydraulic control component integrating pilot pressure release and main valve control functions, are indispensable key control elements in high-pressure and ultra-high-pressure systems. They are widely used in various industrial scenarios requiring stable pressure release, such as ultra-high pressure hydraulic presses, isostatic pressure equipment, long-distance oil pipelines, water supply pumping stations, and large forging equipment. Their core function is to achieve slow pre-pressure release through a pilot mechanism, and then control the main valve to open and complete large-flow fluid discharge, avoiding various risks caused by direct pressure release of high-pressure or ultra-high-pressure liquids.

[0003] For example, the filling valve in Chinese patent document (CN222351050U) includes a valve body, a valve core, and an elastic element. The valve body has an inner cavity, a control port, a first port, and a second port. The inner cavity is connected to the control port, and the first port is connected to the second port through the inner cavity. The control port is used to input or output pressurized oil so that the valve core can move away from or towards the control port in the inner cavity. When the valve core is squeezed by the pressurized oil input by the control port, the elastic element deforms, and the valve core moves away from the control port, thereby closing the first port. When the control port outputs pressurized oil and the valve core is no longer squeezed by the pressurized oil, the elastic element will be able to restore its deformation, and the valve core will move towards the control port to open the first port.

[0004] However, during use, this product only has a pre-release mechanism with a fixed pre-tightening force, which cannot dynamically adjust the pre-release opening pressure according to the system pressure. Under high pressure, the pre-release may open too early, causing the system to lose pressure. Under low pressure, the pre-release opening resistance is too large, resulting in poor pre-release. When the main valve opens, it generates a violent hydraulic shock, which can easily damage the valve core, sealing surface and pipeline, affecting the system control accuracy and operational stability. Therefore, improvements are needed. Summary of the Invention

[0005] The purpose of this invention is to solve the problem that existing technologies only have a pre-release mechanism with a fixed pre-tightening force, which cannot dynamically adjust the pre-release opening pressure according to the system pressure, and to propose an ultra-high pressure pre-release control valve.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An ultra-high pressure pre-venting control valve includes a lower flange, wherein a mounting base is fixedly connected inside the lower flange, and further includes: The main valve seat is slidably sealed inside the mounting seat by the mounting sleeve, and a cavity is opened inside the main valve seat; The pre-release valve core is located inside the cavity, and an inner cavity is opened inside the pre-release valve core. Multiple side pressure through holes are arranged in a circular array on the top of the inner cavity. The parallel adjustment assembly includes a fixed seat fixedly connected to the bottom side inside the main valve seat. A guide rod is slidably sealed inside the fixed seat. A spring positioning seat is fixedly connected to the top of the guide rod. The top of the spring positioning seat extends into the inner cavity and is fixedly connected to a pre-release spring. An adjustment unit is provided inside the fixed seat at the bottom end of the guide rod for adjusting the pre-release opening pressure of the pre-release valve core.

[0007] As a further description of the above technical solution: The adjustment unit includes: The adjusting screw is threadedly connected to the bottom side of the fixed base, and the bottom end of the adjusting screw extends to the outside of the fixed base and is fixedly connected to a handle; The sliding seat is rotatably connected to the top of the adjusting screw via a bearing. The top of the sliding seat is fixedly connected to the bottom of the guide rod, and the sliding seat is slidably connected inside the fixed seat.

[0008] As a further description of the above technical solution: The adjustment unit further includes: The fixed base has sliding grooves on both sides inside, and a slider is slidably connected inside the sliding groove. The inner circumference of the slider is fixedly connected to the outer circumference of the sliding base. The cross-sectional shape of both the slider and the sliding groove is fan-shaped.

[0009] As a further description of the above technical solution: Also includes: The top of the pre-vent valve core is cone-shaped, and the cavity is stepped. The cone-shaped surface at the top of the pre-vent valve core is sealed to the stepped shoulder on the cavity. Multiple spiral microgrooves are formed on the cone-shaped surface at the top of the pre-vent valve core.

[0010] As a further description of the above technical solution: Also includes: The valve body is fixedly connected to the top of the lower flange by screws, and the end cap is fixedly connected to the top of the valve body by screws. A side flange is connected to one side of the valve body.

[0011] As a further description of the above technical solution: Also includes: The pre-release valve core is provided with a valve needle at the top, which slides and seals inside the main valve seat. The top of the pre-release spring is fixedly connected to the inner wall of the pre-release valve core.

[0012] As a further description of the above technical solution: Also includes: A piston rod is provided at the top of the valve needle, and a limiting seat is provided on the outer periphery of the top of the piston rod. The limiting seat is fixedly connected to the top of the valve body.

[0013] As a further description of the above technical solution: Also includes: The piston rod extends to the top of the limiting seat and is fixedly connected to a piston. A first spring is fixedly connected below the limiting seat. The first spring is sleeved on the outer periphery of the piston rod, and a spring mounting seat is fixedly connected to the bottom end of the first spring. The spring mounting seat is fixedly connected to the outer periphery of the piston rod.

[0014] As a further description of the above technical solution: Also includes: The outer periphery of the top of the main valve seat is tapered, and a retaining ring is attached to the tapered outer surface of the top of the main valve seat. A retaining ring spring seat is fixedly connected to the outer periphery of the retaining ring. A second spring is fixedly connected to the outer periphery of the bottom of the retaining ring spring seat. The second spring is sleeved on the outer periphery of the main valve seat, and a mounting sleeve is fixedly connected to the bottom end of the second spring. The bottom of the mounting sleeve is fixedly connected to the top of the mounting seat. The mounting seat has multiple third through holes arranged in a circular array inside.

[0015] As a further description of the above technical solution: Also includes: The top of the cavity has a plurality of upwardly angled second through holes arranged in a circular array, and below each of the plurality of second through holes are a plurality of downwardly angled first through holes, which are connected to the cavity.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. In this invention, the operator manually operates the handle to drive the adjusting screw to rotate. The axial displacement of the adjusting screw is transmitted to the guide rod and the spring positioning seat through the sliding seat. This causes the spring positioning seat to move upward, adjusting the pre-tightening compression force of the pre-release spring, thereby adjusting the pre-release opening pressure of the pre-release valve core. This allows the pre-release opening pressure to be flexibly set and matched according to the actual working conditions, avoiding hydraulic shocks and pressure changes caused by mismatched pre-release pressure during the pressure relief phase of the ultra-high pressure system. This improves the stability and sealing reliability of the control valve, effectively ensuring the stable, efficient, and safe operation of the entire ultra-high pressure hydraulic control system.

[0017] 2. In this invention, external high-pressure oil is delivered to the cavity through the bottom of the lower flange and the first through hole. The upward hydraulic thrust generated by the high-pressure oil tightly presses the pre-release valve core onto the conical sealing seat of the main valve seat. At the same time, the preload of the pre-release spring and the hydraulic thrust are superimposed in the same direction, forming a hydraulic self-tightening seal adapted to ultra-high pressure conditions. The higher the pressure, the tighter the sealing surface fits, which greatly improves the sealing reliability and pressure holding stability of the product under ultra-high pressure conditions. On this basis, the high-pressure oil below the lower flange enters the pre-release valve core through the side pressure through hole, forming an adaptive upward thrust. This not only prevents the pre-release from opening prematurely under high pressure, causing system pressure loss, but also avoids the main valve opening impact caused by the pre-release not opening under low pressure. It achieves real-time matching between system pressure and pre-release opening pressure, automatically balancing the core contradiction between high-pressure pressure holding stability and low-pressure pre-release smoothness in the ultra-high pressure hydraulic system. This significantly improves the control accuracy and operational stability of the ultra-high pressure system and effectively protects the valve core, sealing surface, and pipeline from impact damage.

[0018] 3. In this invention, during the reciprocating motion of the pre-release valve core, the spiral microgroove scrapes and guides the flow by sliding relative to the conical surface, automatically scraping impurities, iron filings, and oil stains between the sealing surfaces into the low-pressure side flow channel. This prevents impurities from getting stuck on the sealing surface or scratching the sealing pair, effectively reducing abrasive wear and contact fatigue wear of the sealing surface under ultra-high pressure conditions. It ensures that the fitting accuracy and sealing reliability of the sealing surface in the ultra-high pressure range do not decrease with the duration of use, significantly improving the sealing stability and overall service life of this ultra-high pressure pre-release control valve in harsh oil environments, and further enhancing the operational reliability and continuity of the entire ultra-high pressure hydraulic control system. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the overall disassembled three-dimensional structure of the present invention; Figure 3 This is a three-dimensional cross-sectional view of the internal structure of the present invention; Figure 4 In this invention Figure 3 A magnified schematic diagram of the structure at point A; Figure 5 In this invention Figure 3 A magnified schematic diagram of the structure at point B; Figure 6 This is a schematic diagram of the overall three-dimensional structure of the piston and main valve seat in this invention; Figure 7 This is a schematic diagram of the overall three-dimensional structure of the parallel adjustment component in this invention; Figure 8 This is a three-dimensional structural diagram of the parallel adjustment component in this invention from another perspective.

[0020] Legend: 1. Lower flange; 2. Valve body; 3. End cover; 4. Side flange; 5. Main valve seat; 6. Pre-release valve core; 7. Parallel adjustment assembly; 701. Fixed seat; 702. Adjusting screw; 703. Rotary handle; 704. Sliding seat; 705. Guide rod; 706. Spring positioning seat; 707. Pre-release spring; 708. Slide groove; 709. Sliding block; 8. Helical microgroove; 9. Side pressure through hole; 10. Mounting seat; 11. Limiting seat; 12. Piston rod; 13. Piston; 14. Spring mounting seat; 15. First spring; 16. Valve needle; 17. Snap ring; 18. Snap ring spring seat; 19. Second spring; 20. First through hole; 21. Cavity; 22. Second through hole. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1-8 The present invention provides a technical solution: an ultra-high pressure pre-release control valve, including a lower flange 1, wherein a mounting base 10 is fixedly connected inside the lower flange 1, and further comprising: The main valve seat 5 is slidably sealed inside the mounting seat 10 by the mounting sleeve, and a cavity 21 is opened inside the main valve seat 5; The pre-release valve core 6 is located inside the cavity 21, and the pre-release valve core 6 has an inner cavity, with multiple side pressure through holes 9 arranged in a circular array at the top of the inner cavity. The parallel adjustment assembly 7 includes a fixed seat 701 fixedly connected to the bottom side inside the main valve seat 5. A guide rod 705 is slidably sealed inside the fixed seat 701. A spring positioning seat 706 is fixedly connected to the top end of the guide rod 705. The top end of the spring positioning seat 706 extends into the inner cavity and is fixedly connected to a pre-release spring 707. An adjustment unit is provided inside the fixed seat 701 at the bottom end of the guide rod 705 for adjusting the pre-release opening pressure of the pre-release valve core 6. The adjustment unit includes: The adjusting screw 702 is threadedly connected to the bottom side inside the fixed base 701, and the bottom end of the adjusting screw 702 extends to the outside of the fixed base 701 and is fixedly connected to the handle 703; The sliding seat 704 is rotatably connected to the top of the adjusting screw 702 via a bearing. The top of the sliding seat 704 is fixedly connected to the bottom of the guide rod 705, and the sliding seat 704 is slidably connected inside the fixed seat 701. The fixed base 701 has sliding grooves 708 on both sides inside. A slider 709 is slidably connected inside the sliding groove 708. The inner circumference of the slider 709 is fixedly connected to the outer circumference of the sliding base 704. The cross-sectional shape of both the slider 709 and the sliding groove 708 is fan-shaped.

[0023] The specific usage method and working principle are as follows: According to the actual working conditions of the ultra-high pressure hydraulic system, the operator can first manually operate the handle 703. The handle 703 drives the adjusting screw 702 to make an axial movement along the internal thread of the fixed seat 701. The axial displacement of the adjusting screw 702 is transmitted to the guide rod 705 and the spring positioning seat 706 through the sliding seat 704, driving the spring positioning seat 706 to move upward and change the compression of the pre-release spring 707. This achieves precise control of the pre-tightening force of the pre-release spring 707, and finally completes the flexible setting of the pre-release opening pressure of the pre-release valve core 6. The pre-release pressure can be flexibly set according to the actual working conditions, avoiding the hydraulic shock problem in the opening stage of the ultra-high pressure system from the source, and greatly improving the overall stability of the control valve operation and the long-term reliability of the sealing structure. After setting the pre-release opening pressure, the lower flange 1 is sealed and connected to the high-pressure oil circuit of the external ultra-high pressure hydraulic device. When the system enters the liquid filling and pressure holding condition, the external high-pressure oil will enter the control valve from the bottom of the lower flange 1 through the oil inlet of the external device. The high-pressure oil is quickly transported to the cavity 21 along the first through hole 20. The high-pressure oil directly acts on the pressure-bearing end face of the pre-release valve core 6, forming a continuous upward hydraulic thrust according to the hydraulic pressure bearing principle. Under the action of this thrust, the pre-release valve core 6 is tightly pressed on the conical sealing seat of the main valve seat 5. At the same time, the pre-tightening elastic force of the pre-release spring 707 and the hydraulic thrust are superimposed in the same direction. The two work together to form a hydraulic self-tightening sealing structure. The higher the pressure, the tighter the sealing surface of the pre-release valve core 6 and the main valve seat 5 are in contact, which greatly improves the sealing reliability and pressure holding stability of the product under ultra-high pressure conditions of 75~80MPa, so that the product can meet the stringent requirements of pressure holding performance in heavy forging and ultra-high pressure testing scenarios. Based on the hydraulic self-tightening seal, high-pressure oil below the lower flange 1 is precisely introduced into the inner cavity of the pre-vent valve core 6 through the side pressure through hole 9. The high-pressure oil acts on the annular pressure bearing surface of the pre-vent valve core 6, forming an adaptive upward thrust that is linked to the system pressure in real time. This adaptive thrust can be dynamically adjusted according to the changes in the system pressure of the main valve cavity. When the system pressure rises to the ultra-high pressure range, the adaptive thrust increases synchronously, further compressing the pre-vent spring 707, so that the pre-vent opening pressure automatically increases with the system pressure, effectively preventing the system pressure loss problem caused by the premature opening of the pre-vent valve core 6 under high pressure conditions, and ensuring the stability of the ultra-high pressure holding condition. When the system pressure is in the low pressure range, the adaptive thrust decreases synchronously, the pre-vent spring 707 naturally rebounds, and the pre-vent opens. The pressure automatically drops upon opening, ensuring smooth opening of the pre-release valve core 6 under low-pressure conditions. This avoids severe hydraulic shock during the main valve opening phase caused by excessive pre-release opening resistance. The system pressure and pre-release opening pressure are matched in real time through a purely mechanical structure, automatically balancing the core contradiction between high-pressure holding stability and low-pressure pre-release smoothness in the ultra-high-pressure system. This significantly improves the control accuracy and overall operational stability of the ultra-high-pressure hydraulic system. From a structural perspective, it effectively protects the valve core, conical sealing surface, pipelines, and surrounding hydraulic components from high-pressure impact damage, extending the service life of the entire hydraulic system. The control system, sensor system, electrical system, and external hydraulic transmission system involved in this application are all known and disclosed technologies known to those skilled in the art, and therefore will not be elaborated upon further in this application.

[0024] Please see Figure 3 and Figure 5 The top of the pre-release valve core 6 is conical, and the cavity 21 is stepped. The conical surface at the top of the pre-release valve core 6 is sealed to the stepped shoulder on the cavity 21. Multiple spiral microgrooves 8 are formed on the conical surface at the top of the pre-release valve core 6. The groove depth of the spiral microgrooves 8 is set to 0.2~0.5mm, the groove width is set to 1~2mm, the helix angle along the generatrix of the conical surface is set to 15°~30°, and the rotation direction of the spiral microgrooves 8 can be set to right-hand or left-hand according to actual needs.

[0025] The specific usage method and working principle are as follows: During the reciprocating opening and closing motion of the pre-release valve core 6 as the ultra-high pressure system switches operating conditions, the spiral micro-groove 8, located at the mating conical surface of the pre-release valve core 6 and the main valve seat 5, generates a dual effect of efficient mechanical scraping and directional flow guidance synchronously with the relative sliding of the two conical surfaces. The spiral micro-groove 8 extends spirally along the generatrix of the conical surface, and the groove shape parameters are adapted to the fitting accuracy of the ultra-high pressure sealing pair. Without affecting the specific pressure of the conical surface seal or reducing the hydraulic self-tightening sealing effect, it can accurately scrape away solid impurities, metal filings, and viscous oil stains generated between the sealing surfaces due to oil circulation and component wear. This product utilizes the mechanical force of the relative sliding of the conical surfaces to quickly scrape away various contaminants that adhere to the sealing mating surface and are easily stuck in the sealing gap. The sealing surface, relying on the directional flow-guiding structure of the spiral groove, guides the scraped contaminants into the low-pressure side flow channel, allowing the contaminants to be quickly discharged from the sealing area with the low-pressure oil. This fundamentally avoids the accumulation and jamming of impurities on the sealing surface, as well as irreversible damage such as scratches and dents caused by hard particles to the conical sealing surface. It ensures that the sealing surface's fit accuracy and sealing reliability do not decrease with the length of use within the 75~80MPa ultra-high pressure range, significantly improving the sealing stability and overall service life of the control valve in harsh oil environments. It also ensures the long-term stable operation of the control valve under continuous working conditions such as heavy forging and ultra-high pressure testing, reducing equipment downtime and maintenance costs caused by sealing failures, and further enhancing the operational reliability and continuity of the ultra-high pressure hydraulic system.

[0026] Please see Figures 1-6 The valve body 2 is fixedly connected to the top of the lower flange 1 by screws, and the end cap 3 is fixedly connected to the top of the valve body 2 by screws. A side flange 4 is connected to one side of the valve body 2. Also includes: The top of the pre-release valve core 6 is provided with a valve needle 16, which is slidably sealed inside the main valve seat 5. The top of the pre-release spring 707 is fixedly connected to the inner wall of the pre-release valve core 6. A piston rod 12 is provided at the top of the valve needle 16, and a limiting seat 11 is provided on the outer periphery of the top of the piston rod 12. The limiting seat 11 is fixedly connected to the top of the valve body 2. The piston rod 12 extends to the top of the limiting seat 11 and is fixedly connected to the piston 13. A first spring 15 is fixedly connected below the limiting seat 11. The first spring 15 is sleeved on the outer periphery of the piston rod 12, and a spring mounting seat 14 is fixedly connected to the bottom end of the first spring 15. The spring mounting seat 14 is fixedly connected to the outer periphery of the piston rod 12. The top outer periphery of the main valve seat 5 is tapered, and a retaining ring 17 is attached to the tapered outer surface of the main valve seat 5. A retaining ring spring seat 18 is fixedly connected to the outer periphery of the retaining ring 17. A second spring 19 is fixedly connected to the bottom outer periphery of the retaining ring spring seat 18. The second spring 19 is sleeved on the outer periphery of the main valve seat 5, and a mounting sleeve is fixedly connected to the bottom end of the second spring 19. The bottom of the mounting sleeve is fixedly connected to the top of the mounting base 10. The mounting base 10 has multiple third through holes arranged in a circular array inside. The top of the cavity 21 has a plurality of upwardly angled second through holes 22 arranged in a circular array, and a plurality of downwardly angled first through holes 20 are respectively provided below the plurality of second through holes 22. The first through holes 20 are connected to the cavity 21.

[0027] The specific usage method and working principle are as follows: When the ultra-high pressure hydraulic system needs to perform a pressure relief operation, the external control oil circuit accurately introduces the pressure oil into the control chamber inside the end cover 3. The hydraulic thrust formed by the control oil directly acts on the top of the piston 13, driving the piston 13 to move the piston rod 12 slightly downward axially. During the downward movement of the piston rod 12, its front end first abuts against the valve needle 16 and applies downward pressure, causing the valve needle 16 to overcome the pre-tightening elastic force of the pre-release spring 707, and simultaneously push the pre-release valve core 6 to move axially away from the stepped shoulder inside the cavity 21, thereby accurately opening the pre-release valve port. After the pre-release valve port is opened, the lower flange 1 below... High-pressure oil is smoothly delivered to the low-pressure buffer chamber inside the valve body 2 through the first through hole 20, the cavity 21 and the second through hole 22 along the preset oil circuit. Then, it is quickly returned to the oil tank or low-pressure oil circuit through the external oil circuit connected by the side flange 4. The ultra-high pressure below the lower flange 1 can be accurately reduced to the safe range of 0.5MPa through this small flow pre-drain oil circuit, which completely eliminates the high pressure self-tightening force generated by the hydraulic self-tightening seal. This provides sufficient unloading pretreatment for the smooth opening of the main valve. It fundamentally avoids the severe hydraulic shock and pipeline vibration caused by directly opening the main valve under ultra-high pressure, and effectively protects the structural integrity of the sealing pair, valve core and hydraulic pipeline. As the pressure of the external control oil circuit continues to rise, when the control oil pressure is precisely raised to the preset threshold of 2.55MPa, the hydraulic thrust on the piston 13 is sufficient to overcome the combined elastic force of the first spring 15 and the second spring 19 and the residual hydraulic pressure of the system. At this time, the piston 13 transmits the downward pressure to the main valve seat 5 through the piston rod 12, and drives the retaining ring 17 and the retaining ring spring seat 18 to squeeze the second spring 19 downward together. Under the combined force, the main valve seat 5 moves downward along the axis, so that the conical sealing surface between the main valve seat 5 and the lower flange 1 is fully opened, and the second stage of staged unloading is started. After the conical sealing surface is opened, a large-diameter flow channel is formed, which can realize the large flow and rapid switching of ultra-high pressure oil, meet the core requirements of 75~80MPa ultra-high pressure hydraulic system for large flow filling or depressurization under heavy forging, rapid return and other working conditions, and greatly improve the system's oil circuit switching efficiency and operation response speed. After the system completes the filling or depressurization operation, the external control oil circuit depressurizes, and the hydraulic thrust in the control chamber disappears. At this time, the elastic restoring force of the first spring 15 and the second spring 19, together with the high-pressure self-tightening force restored by the system, form a compound thrust in the same direction, which jointly pushes the pre-release valve core 6 and the main valve seat 5 to reset axially upward, so that the pre-release valve core 6 re-fits tightly against the conical sealing seat of the main valve seat 5, and the main valve seat 5 also restores the sealing fit with the conical sealing surface of the lower flange 1. The flow channel inside the pre-release valve port and the main valve seat 5 closes synchronously, so that the control valve quickly returns to the initial ultra-high pressure holding state, waiting for the next working condition switching command. The entire reset process is achieved by the linkage of pure mechanical elastic force and hydraulic self-tightening force, without the need for additional electrical control. The reset response speed is fast and the sealing fit accuracy is high, ensuring that the control valve can quickly restore the pressure holding function and ensuring the continuous and stable operation of the ultra-high pressure hydraulic system.

[0028] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An ultra-high pressure pre-venting control valve, comprising a lower flange (1), characterized in that, The lower flange (1) is internally fixedly connected to a mounting base (10), and also includes: The main valve seat (5) is slidably sealed inside the mounting seat (10) by the mounting sleeve, and a cavity (21) is provided inside the main valve seat (5). The pre-venting valve core (6) is located inside the cavity (21), and the pre-venting valve core (6) has an inner cavity, with multiple side pressure through holes (9) arranged in a circular array at the top of the inner cavity. The parallel adjustment assembly (7) includes a fixed seat (701) fixedly connected to the bottom side inside the main valve seat (5). A guide rod (705) is slidably sealed inside the fixed seat (701). A spring positioning seat (706) is fixedly connected to the top of the guide rod (705). A pre-release spring (707) is fixedly connected to the top of the spring positioning seat (706) after extending into the inner cavity. An adjustment unit is provided inside the fixed seat (701) at the bottom of the guide rod (705) for adjusting the pre-release opening pressure of the pre-release valve core (6).

2. The ultra-high pressure pre-venting control valve according to claim 1, characterized in that, The adjustment unit includes: The adjusting screw (702) is threadedly connected to the bottom side inside the fixed seat (701), and the bottom end of the adjusting screw (702) extends to the outside of the fixed seat (701) and is fixedly connected to the handle (703). The sliding seat (704) is rotatably connected to the top of the adjusting screw (702) via a bearing. The top of the sliding seat (704) is fixedly connected to the bottom of the guide rod (705), and the sliding seat (704) is slidably connected inside the fixed seat (701).

3. The ultra-high pressure pre-venting control valve according to claim 2, characterized in that, The adjustment unit further includes: The fixed base (701) has a sliding groove (708) on both sides inside. A slider (709) is slidably connected inside the sliding groove (708). The inner circumference of the slider (709) is fixedly connected to the outer circumference of the sliding base (704). The cross-sectional shape of the slider (709) and the sliding groove (708) is set to a fan shape.

4. The ultra-high pressure pre-venting control valve according to claim 1, characterized in that, Also includes: The top of the pre-vent valve core (6) is set as a cone, and the cavity (21) is set as a step. The cone surface at the top of the pre-vent valve core (6) is sealed to the step shoulder on the cavity (21). Multiple spiral microgrooves (8) are opened on the cone surface at the top of the pre-vent valve core (6).

5. The ultra-high pressure pre-venting control valve according to claim 1, characterized in that, Also includes: The valve body (2) is fixedly connected to the top of the lower flange (1) by screws, and the end cap (3) is fixedly connected to the top of the valve body (2) by screws. A side flange (4) is connected to one side of the valve body (2).

6. The ultra-high pressure pre-venting control valve according to claim 1, characterized in that, Also includes: The pre-release valve core (6) is provided with a valve needle (16) at the top. The valve needle (16) is slidably sealed inside the main valve seat (5). The top of the pre-release spring (707) is fixedly connected to the inner wall of the pre-release valve core (6).

7. The ultra-high pressure pre-venting control valve according to claim 6, characterized in that, Also includes: The valve needle (16) is provided with a piston rod (12) at the top, and a limiting seat (11) is provided on the outer periphery of the top of the piston rod (12). The limiting seat (11) is fixedly connected to the top of the valve body (2).

8. The ultra-high pressure pre-venting control valve according to claim 7, characterized in that, Also includes: The piston rod (12) extends to the top of the limiting seat (11) and is fixedly connected to the piston (13). A first spring (15) is fixedly connected below the limiting seat (11). The first spring (15) is sleeved on the outer periphery of the piston rod (12), and a spring mounting seat (14) is fixedly connected to the bottom end of the first spring (15). The spring mounting seat (14) is fixedly connected to the outer periphery of the piston rod (12).

9. The ultra-high pressure pre-venting control valve according to claim 1, characterized in that, Also includes: The top outer periphery of the main valve seat (5) is tapered, and a retaining ring (17) is attached to the tapered outer surface of the main valve seat (5). A retaining ring spring seat (18) is fixedly connected to the outer periphery of the retaining ring (17). A second spring (19) is fixedly connected to the bottom outer periphery of the retaining ring spring seat (18). The second spring (19) is sleeved on the outer periphery of the main valve seat (5), and an installation sleeve is fixedly connected to the bottom end of the second spring (19). The bottom of the installation sleeve is fixedly connected to the top of the installation seat (10). The installation seat (10) has multiple third through holes arranged in a circular array inside.

10. The ultra-high pressure pre-venting control valve according to claim 1, characterized in that, Also includes: The top of the cavity (21) has a plurality of upwardly oriented second through holes (22) arranged in a circular array. Below the plurality of second through holes (22) are a plurality of downwardly oriented first through holes (20), and the first through holes (20) are connected to the cavity (21).

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