An integrated amplifier single feedback closed loop proportional throttling valve

Abstract

The application discloses an integrated-amplifier single-feedback closed-loop proportional throttle valve and relates to the technical field of throttle valve production.The integrated-amplifier single-feedback closed-loop proportional throttle valve comprises a main valve, a pilot proportional valve, a displacement sensor and an amplifier, and a single-feedback closed-loop control of the displacement of a main valve core is formed through built-in oil paths and electrical signal feedback.Based on the integrated design of the threaded plug-in type of the main valve and the pilot proportional valve, the integrated amplifier and the displacement sensor are taken as cores to construct a single-feedback closed-loop control loop, the slide valve structure of the pilot proportional valve is matched with accurate electromagnetic control, the flexibility and the anti-sticking ability of the valve core movement are obviously improved, the technical difficulties of the complex structure and the easy sticking of the traditional double-feedback proportional throttle valve are effectively solved, accurate proportional throttle control under the high-pressure large-flow working condition is realized, and the integrated-amplifier single-feedback closed-loop proportional throttle valve has the obvious advantages of compact structure, fast response, strong anti-pollution ability and high reliability.

Description

Technical Field

[0001] This invention relates to the field of throttle valve manufacturing technology, specifically to an integrated amplifier single-feedback closed-loop proportional throttle valve. Background Technology

[0002] In the field of hydraulic transmission and control systems, the proportional throttle valve is a core component for achieving precise flow regulation. Its performance directly determines the operating accuracy, reliability, and energy consumption level of hydraulic machinery and equipment. Especially in scenarios such as metallurgy, engineering machinery, and shipbuilding, where high pressure and high flow rate are required and the accuracy of flow ratio regulation is stringent, extremely high requirements are placed on the proportional throttle valve for leak-free operation, anti-jamming, and control stability.

[0003] Currently, existing hydraulic circuit solutions for high-flow regulation generally employ a spool valve structure as the pilot solenoid valve, combined with a two-way cartridge valve. The pilot solenoid valve controls the opening and closing of the two-way cartridge valve, thereby achieving reversing and pressure-holding functions. However, this type of solution has the following significant limitations in practical applications:

[0004] On the one hand, existing large-flow proportional throttle valves often adopt a dual feedback control architecture to ensure control accuracy. This requires setting up two independent feedback detection units to monitor the operating status of the pilot valve and the main valve respectively, resulting in a complicated overall structure and a large number of parts. This not only increases the equipment manufacturing cost but also increases the assembly difficulty and subsequent maintenance cost.

[0005] On the other hand, there are defects in the structural design of the core control components. Pilot solenoid valves mostly adopt a spool valve structure and valve seat cooperation. Under the condition that impurities are inevitably present in the hydraulic system oil, the spool valve gap is easily blocked by impurities, which leads to problems such as valve core jamming and inflexible switching, seriously affecting the flow regulation accuracy and even causing equipment shutdown failure.

[0006] In view of the technical defects of the existing technology, such as complex structure, high cost and weak anti-jamming ability, there is an urgent need to develop a proportional throttle valve with simplified structure, reliable operation, high adjustment accuracy and adaptability to high pressure and high flow rate scenarios, so as to break through the existing technical bottleneck and improve the overall operating performance of hydraulic mechanical equipment.

[0007] The information disclosed in the background section is intended only to enhance understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0008] To address the aforementioned technical problems, embodiments of the present invention provide an integrated amplifier single-feedback closed-loop proportional throttle valve to solve the problems mentioned in the background art.

[0009] This invention provides the following technical solution: an integrated amplifier single-feedback closed-loop proportional throttle valve, comprising...

[0010] The main valve includes a main valve sleeve and a main valve core disposed in the axial hole of the main valve sleeve. The main valve sleeve has a main valve inlet and a main valve outlet on its side.

[0011] The cover plate, which is installed at one end of the main valve sleeve, is used to carry the pilot proportional valve, displacement sensor and amplifier;

[0012] The pilot proportional valve is mounted on the cover plate. The side of the pilot proportional valve is provided with a pilot oil inlet, a pilot working port and a pilot oil return port for realizing oil flow.

[0013] A displacement sensor, mounted on the cover plate, is used to detect the displacement signal of the main valve core;

[0014] And an amplifier, which is located on the side of the displacement sensor, is used to process signals and output drive commands;

[0015] The cover plate contains a pilot control oil circuit, a process hole, and a return oil passage. The pilot control oil circuit connects the control port located on the bottom surface of the cover plate with the pilot oil inlet located on the side of the pilot proportional valve.

[0016] The process port connects the pilot working port located on the side of the pilot proportional valve with the control chamber of the main valve.

[0017] The oil return port located on the bottom surface of the cover plate is connected to the pilot oil return port located on the side of the pilot proportional valve to form an oil return passage.

[0018] The displacement sensor is electrically connected to the pilot proportional valve via a feedback line. The amplifier is equipped with a control signal interface to receive external control signals and output control current to the pilot proportional valve according to the feedback signal of the displacement sensor, thereby forming a single feedback closed-loop control loop based on the displacement of the main valve core.

[0019] Preferably, the main valve further includes a cover gasket, a fixing spring pin, a displacement feedback rod, and a main valve spring; one end of the main valve sleeve is sealed by the cover gasket, and the cover gasket is fixed relative to the main valve sleeve by the fixing spring pin; the displacement feedback rod and the main valve spring are disposed in the inner hole of the main valve core, and the displacement feedback rod is in contact with the sensing rod of the displacement sensor to realize the accurate transmission of the displacement of the main valve core.

[0020] Preferably, the pilot proportional valve includes a pilot valve sleeve, a hollow pilot valve core, a pilot spring, a proportional coil, an armature push rod, and a magnetic sleeve;

[0021] The pilot valve core and pilot spring are disposed in the axial hole of the pilot valve sleeve, and the pilot valve core can move axially up and down along the axial hole.

[0022] The outer circumferential surface of the pilot valve core is provided with an annular groove. Its outer circular surface is fitted with the inner wall of the pilot valve sleeve through the annular groove to form a slide valve structure. One end of the inner hole of the pilot valve core is connected to the pilot return oil port, and the other end of the inner hole is in contact with the armature push rod.

[0023] The side wall of the pilot valve sleeve is provided with a pilot oil inlet and a pilot working port, and both ports can be selectively aligned with the annular groove on the outer periphery of the pilot valve core.

[0024] When the pilot valve core is driven upward by the electromagnetic force of the proportional coil, its outer annular groove is simultaneously aligned with the pilot oil inlet and the pilot working port, so that the pilot oil inlet 12 is connected to the pilot working port through the annular groove, and the pilot oil return port is disconnected from the pilot working port.

[0025] When the pilot valve core moves downward under the restoring force of the pilot spring, the annular groove on its outer periphery is misaligned with the pilot oil inlet. The pilot working port is connected to the pilot oil return port through the hollow inner hole of the pilot valve core, and the pilot oil inlet is disconnected from the pilot working port.

[0026] The magnetic sleeve is connected to the pilot valve sleeve. The proportional coil is set outside the magnetic sleeve to receive the drive signal from the amplifier and convert it into electromagnetic force, which pushes the armature push rod to move the pilot valve core up and down axially.

[0027] Preferably, the amplifier is integrated on the side of the displacement sensor and electrically connected to the displacement sensor and the pilot proportional valve to form an integrated electronic control unit.

[0028] Preferably, the main valve core and valve seat adopt a cone sealing structure.

[0029] Preferably, the proportional coil receives feedback signals from the displacement sensor via a feedback line, and the feedback signals directly participate in the closed-loop control of the pilot valve core displacement.

[0030] Preferably, the main valve sleeve, cover plate and pilot valve sleeve are all made of alloy steel.

[0031] The integrated amplifier single-feedback closed-loop proportional throttle valve provided in this invention has the following advantages: Based on the threaded cartridge integrated design of the main valve and the pilot proportional valve, this invention constructs a single-feedback closed-loop control loop with an integrated amplifier and a displacement sensor as the core. The spool structure of the pilot proportional valve, combined with precise electromagnetic control, significantly improves the flexibility and anti-jamming capability of the valve core movement, effectively solving the technical problems of complex structure and easy jamming of traditional dual-feedback proportional throttle valves. It realizes precise proportional throttle control under high pressure and high flow conditions, and has significant advantages such as compact structure, fast response, strong anti-pollution capability, and high reliability. Attached Figure Description

[0032] Figure 1This is a schematic diagram of the structure of an integrated amplifier single-feedback closed-loop proportional throttle valve according to the present invention;

[0033] Figure 2 This is a cross-sectional structural schematic diagram of an integrated amplifier single-feedback closed-loop proportional throttle valve according to the present invention.

[0034] Figure 3 This is the present invention. Figure 2 A magnified schematic diagram of the structure of part A in the diagram;

[0035] Figure 4 This is a schematic diagram of the control system of an integrated amplifier single feedback closed-loop proportional throttle valve according to the present invention. Detailed Implementation

[0036] 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.

[0037] See Figures 1-4 .

[0038] To address the problems mentioned in the background section, this invention provides an integrated amplifier single-feedback closed-loop proportional throttle valve to solve the aforementioned technical problems. The technical solution is as follows:

[0039] An integrated amplifier single-feedback closed-loop proportional throttle valve, comprising:

[0040] The main valve includes a main valve sleeve 2 and a main valve core 3 disposed in the axial hole of the main valve sleeve 2. The main valve sleeve 2 has a main valve inlet 1 and a main valve outlet 29 on its side.

[0041] Cover plate 9, which is installed at one end of main valve sleeve 2, is used to carry pilot proportional valve 17, displacement sensor 19 and amplifier 21;

[0042] A pilot proportional valve 17 is mounted on a cover plate 9. The side of the pilot proportional valve 17 is provided with a pilot oil inlet 12, a pilot working port 10 and a pilot oil return port 8 for realizing oil flow.

[0043] Displacement sensor 19, which is mounted on cover plate 9, is used to detect the displacement signal of main valve core 3;

[0044] And amplifier 21, which is disposed on the side of displacement sensor 19, for processing signals and outputting drive commands;

[0045] The cover plate 9 has a pilot control oil passage 24, a process hole 10.1 and a return oil passage. The pilot control oil passage 24 is connected to the control port 26 located on the bottom surface of the cover plate 9 and the pilot oil inlet 12 located on the side of the pilot proportional valve 17.

[0046] Process hole 10.1 connects the pilot working port 10 located on the side of the pilot proportional valve 17 with the control cavity 25 of the main valve;

[0047] The oil return port 7 located on the bottom surface of the cover plate 9 is connected to the pilot oil return port 8 located on the side of the pilot proportional valve 17 to form an oil return passage.

[0048] The displacement sensor 19 is electrically connected to the pilot proportional valve 17 via the feedback line 18. The amplifier 21 is provided with a control signal interface 20, which is used to receive external control signals and output control current to the pilot proportional valve 17 according to the feedback signal of the displacement sensor 19, thereby forming a single feedback closed-loop control loop based on the displacement of the main valve core 3.

[0049] In this embodiment, the main valve also includes a cover gasket 6, a fixing spring pin 28, a displacement feedback rod 4, and a main valve spring 5; one end of the main valve sleeve 2 is sealed by the cover gasket 6, and the cover gasket 6 is fixed relative to the main valve sleeve 2 by the fixing spring pin 28; the displacement feedback rod 4 and the main valve spring 5 are disposed in the inner hole of the main valve core 3, and the displacement feedback rod 4 is in contact with the sensing rod 22 of the displacement sensor 19 to realize the accurate transmission of the displacement of the main valve core 3.

[0050] It should be noted that the cover gasket 6 seals one end of the main valve sleeve 2, and the fixing spring pin 28 fixes the cover gasket 6 to the main valve sleeve 2; the main valve spring 5 in the inner hole of the main valve core 3 provides the restoring force, and the displacement feedback rod 4 contacts the sensing rod 22 of the displacement sensor 19 to accurately transmit the displacement of the main valve core 3.

[0051] In this embodiment, the pilot proportional valve 17 includes a pilot valve sleeve 11, a hollow pilot valve core 13, a pilot spring 14, a proportional coil 17.1, an armature push rod 15, and a magnetic sleeve 16.

[0052] The pilot valve core 13 and the pilot spring 14 are disposed in the axial hole of the pilot valve sleeve 11. The pilot valve core 13 can move axially up and down along the axial hole. The pilot spring 14 is sleeved on the end of the pilot valve core 13 near the oil return port and provides a downward reset force.

[0053] The outer circumferential surface of the pilot valve core 13 is provided with an annular groove. Its outer circular surface is engaged with the inner wall of the pilot valve sleeve 11 through the annular groove to form a slide valve structure. One end of the inner hole of the pilot valve core 13 is connected to the pilot return oil port 8, and the other end of the inner hole is in contact with the armature push rod 15.

[0054] The side wall of the pilot valve sleeve 11 is provided with a pilot oil inlet 12 and a pilot working port 10, and both ports can be selectively aligned with the annular groove on the outer periphery of the pilot valve core 13.

[0055] When the pilot valve core 13 is driven upward by the electromagnetic force of the proportional coil 17.1, its outer annular groove is simultaneously aligned with the pilot oil inlet 12 and the pilot working port 10, so that the pilot oil inlet 12 is connected to the pilot working port 10 through the annular groove, and the pilot oil return port 8 is disconnected from the pilot working port 10.

[0056] When the pilot valve core 13 moves downward under the restoring force of the pilot spring 14, the annular groove on its outer periphery is misaligned with the pilot oil inlet 12, and the pilot working port 10 is connected to the pilot oil return port 8 through the hollow inner hole of the pilot valve core 13, and the pilot oil inlet 12 is disconnected from the pilot working port 10.

[0057] The magnetic sleeve 16 is connected to the pilot valve sleeve 11. The proportional coil 17.1 is set outside the magnetic sleeve 16 to receive the drive signal of the amplifier 21 and convert it into electromagnetic force to push the armature push rod 15 to drive the pilot valve core 13 to move up and down axially.

[0058] In this embodiment, amplifier 21 is integrated on the side of displacement sensor 19 and electrically connected to displacement sensor 19 and pilot proportional valve 17 to form an integrated electronic control unit.

[0059] It should be noted that the amplifier 21 is integrated on the side of the displacement sensor 19 to form a compact integrated electronic control unit; it is electrically connected to the displacement sensor 19 and the pilot proportional valve 17, and can quickly receive the displacement signal from the displacement sensor 19, process it and output the drive signal to the pilot proportional valve 17, while shortening the signal transmission path and improving the control response efficiency.

[0060] In this embodiment, the main valve core 3 and the valve seat adopt a cone sealing structure. It should be noted that the cone sealing structure used between the main valve core 3 and the valve seat can achieve reliable sealing under high-pressure conditions by utilizing the pressure self-tightening characteristic. The higher the pressure, the tighter the cone surface fits, effectively preventing oil leakage and ensuring pressure control accuracy. Furthermore, because the cone surface clearance is larger than in traditional structures, the oil can carry away some impurities, reducing the risk of valve core jamming. Simultaneously, the cone surface has inherent guiding properties, ensuring that the main valve core does not deviate during movement, improving the accuracy of flow cross-sectional area adjustment and flow control stability.

[0061] In this embodiment, the proportional coil 17.1 receives the feedback signal from the displacement sensor 19 through the feedback line 18, and the feedback signal directly participates in the closed-loop control of the displacement of the pilot valve core 13.

[0062] In this embodiment, the main valve sleeve 2, the cover plate 9, and the pilot valve sleeve 11 are all made of alloy steel.

[0063] The present invention provides a control method for a single-feedback closed-loop proportional throttle valve of an integrated amplifier as follows:

[0064] (1) According to the flow regulation requirements, the external control device inputs a control signal through the control signal interface 20 of the amplifier 21. This signal corresponds to the target flow capacity that the main valve needs to achieve, i.e. the target displacement of the main valve core 3. After receiving the external control signal, the amplifier 21 generates a drive current signal through the controller to adjust the action amplitude of the pilot proportional valve 17.

[0065] (2) The drive current output by amplifier 21 is fed into the proportional coil 17.1 of pilot proportional valve 17. The proportional coil 17.1 generates electromagnetic force under the magnetic focusing action of magnetic sleeve 16. The electromagnetic force pushes the armature push rod 15 to move axially. The armature push rod 15 overcomes the elastic force of pilot spring 14 and pushes the pilot valve core 13 to move in the axial hole of pilot valve sleeve 11, changing the oil circuit connection state of pilot valve.

[0066] After the pilot valve core 13 moves, the pilot inlet 12 connects with the pilot working port 10, and the pilot return port 8 disconnects from the pilot working port 10. The pressurized oil from the pilot control oil circuit 24 enters the control chamber 25 of the main valve through the pilot inlet 12, the pilot working port 10, and the process hole 10.1, causing the pressure in the control chamber 25 to increase. The pressure increase is determined by the opening degree of the pilot valve core 13, and the opening degree is precisely controlled by the magnitude of the drive current, thereby realizing the proportional regulation of the pressure in the control chamber 25.

[0067] (3) The pressure in the control cavity 25 acts on the end of the main valve core 3 to form an axial thrust. When the thrust overcomes the elastic force of the main valve spring 5, the main valve core 3 moves away from the control cavity 25 in the axial hole of the main valve sleeve 2, increasing the flow cross-sectional area between the main valve inlet 1 and the main valve outlet 29. The increase in the flow cross-sectional area is positively correlated with the displacement of the main valve core 3, and the displacement is precisely controlled by the pressure in the control cavity 25, ultimately achieving the proportional output of the oil flow rate.

[0068] The cone sealing structure used in the main valve core 3 and the valve seat maintains a reliable seal during the movement of the main valve core, preventing high-pressure oil from leaking between the main valve inlet 1 and the control cavity 25, and ensuring pressure control accuracy and flow regulation stability. The alloy steel material used in the main valve sleeve 2, cover plate 9 and pilot valve sleeve 11 ensures the structural strength of each component under high pressure conditions and prevents deformation from affecting the valve core movement accuracy.

[0069] (4) When the main valve core 3 moves, the displacement feedback rod 4 inside it moves axially synchronously. The displacement feedback rod 4 keeps in contact with the sensing rod 22 of the displacement sensor 19, accurately transmitting the actual displacement of the main valve core 3 to the displacement sensor 19. The displacement sensor 19 converts the displacement signal into an electrical signal and transmits it to the amplifier 21 through the feedback line 18.

[0070] Amplifier 21 compares the received actual displacement signal with the externally input target displacement signal again. If there is a deviation, it adjusts the drive current output to the proportional coil 17.1 in real time. The change in drive current drives the pilot valve core 13 to adjust the opening, thereby correcting the pressure in the control cavity 25, and finally making the actual displacement of the main valve core 3 return to the target value, so as to achieve dynamic, precise and stable control of the flow.

[0071] (5) When there is no external signal input to the control signal interface 20 of amplifier 21, the drive current output by amplifier 21 drops to zero, and the electromagnetic force of proportional coil 17.1 disappears. Pilot spring 14 pushes pilot valve core 13 to reset, so that pilot oil inlet 12 is disconnected from pilot working port 10, and pilot working port 10 is connected to pilot return oil port 8. The pressure oil in control cavity 25 is discharged into the system return oil pipeline through process hole 10.1, pilot working port 10, pilot return oil port 8, and return oil port 7, and the pressure in control cavity 25 drops to low pressure; main valve spring 5 pushes main valve core 3 to reset, and the flow cross-sectional area of ​​main valve inlet 1 and main valve outlet 29 returns to the initial state, and flow regulation stops; displacement sensor 19 collects the initial position signal of main valve core, and the equipment returns to standby state.

[0072] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0073] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of components or the interaction between components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0074] It is understood that those skilled in the art can make equivalent substitutions or modifications to the technical solutions and concepts of this invention, and all such substitutions or modifications should fall within the protection scope of the appended claims.

Claims

1. An integrated amplifier single-feedback closed-loop proportional throttle valve, characterized in that, include The main valve includes a main valve sleeve and a main valve core disposed in the axial hole of the main valve sleeve. The main valve sleeve has a main valve inlet and a main valve outlet on its side. The cover plate, which is installed at one end of the main valve sleeve, is used to carry the pilot proportional valve, displacement sensor and amplifier; The pilot proportional valve is mounted on the cover plate. The side of the pilot proportional valve is provided with a pilot oil inlet, a pilot working port and a pilot oil return port for realizing oil flow. A displacement sensor, mounted on the cover plate, is used to detect the displacement signal of the main valve core; And an amplifier, which is located on the side of the displacement sensor, is used to process signals and output drive commands; The cover plate contains a pilot control oil circuit, a process hole, and a return oil passage. The pilot control oil circuit connects the control port located on the bottom surface of the cover plate with the pilot oil inlet located on the side of the pilot proportional valve. The process port connects the pilot working port located on the side of the pilot proportional valve with the control chamber of the main valve. The oil return port located on the bottom surface of the cover plate is connected to the pilot oil return port located on the side of the pilot proportional valve to form an oil return passage. The displacement sensor is electrically connected to the pilot proportional valve via a feedback line. The amplifier is equipped with a control signal interface to receive external control signals and output control current to the pilot proportional valve according to the feedback signal of the displacement sensor, thereby forming a single feedback closed-loop control loop based on the displacement of the main valve core. The main valve also includes a cover gasket, a fixing spring pin, a displacement feedback rod, and a main valve spring; one end of the main valve sleeve is sealed by the cover gasket, and the cover gasket is fixed to the main valve sleeve by the fixing spring pin; the displacement feedback rod and the main valve spring are set in the inner hole of the main valve core, and the displacement feedback rod is in contact with the sensing rod of the displacement sensor to realize the accurate transmission of the displacement of the main valve core.

2. The integrated amplifier single-feedback closed-loop proportional throttle valve according to claim 1, characterized in that, The pilot proportional valve includes a pilot valve sleeve, a hollow pilot valve core, a pilot spring, a proportional coil, an armature push rod, and a magnetic sleeve; The pilot valve core and pilot spring are disposed in the axial hole of the pilot valve sleeve, and the pilot valve core can move axially up and down along the axial hole. The outer circumferential surface of the pilot valve core is provided with an annular groove. The outer circumferential surface of the pilot valve core is engaged with the inner wall of the pilot valve sleeve through the annular groove to form a slide valve structure. One end of the inner hole of the pilot valve core is connected to the pilot return oil port, and the other end of the inner hole is in contact with the armature push rod. The side wall of the pilot valve sleeve is provided with a pilot oil inlet and a pilot working port, and both ports can be selectively aligned with the annular groove on the outer periphery of the pilot valve core. When the pilot valve core is driven upward by the electromagnetic force of the proportional coil, its outer annular groove is simultaneously aligned with the pilot oil inlet and the pilot working port, so that the pilot oil inlet is connected to the pilot working port through the annular groove, and the pilot oil return port is disconnected from the pilot working port. When the pilot valve core moves downward under the restoring force of the pilot spring, the annular groove on its outer periphery is misaligned with the pilot oil inlet. The pilot working port is connected to the pilot oil return port through the hollow inner hole of the pilot valve core, and the pilot oil inlet is disconnected from the pilot working port. The magnetic sleeve is connected to the pilot valve sleeve. The proportional coil is set outside the magnetic sleeve to receive the drive signal from the amplifier and convert it into electromagnetic force, which pushes the armature push rod to move the pilot valve core up and down axially.

3. The integrated amplifier single-feedback closed-loop proportional throttle valve according to claim 1, characterized in that, The amplifier is integrated on the side of the displacement sensor and is electrically connected to the displacement sensor and the pilot proportional valve to form an integrated electronic control unit.

4. The integrated amplifier single-feedback closed-loop proportional throttle valve according to claim 1, characterized in that, The main valve core and valve seat adopt a cone seal structure.

5. The integrated amplifier single-feedback closed-loop proportional throttle valve according to claim 1, characterized in that, The proportional coil receives feedback signals from the displacement sensor via a feedback line, and the feedback signals directly participate in the closed-loop control of the pilot valve core displacement.

6. The integrated amplifier single-feedback closed-loop proportional throttle valve according to claim 1, characterized in that, The main valve sleeve, cover plate, and pilot valve sleeve are all made of alloy steel.

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