Electric control pilot-operated type pressure regulating valve

Abstract

The utility model discloses an electric control pilot-operated type pressure regulating valve, and belongs to the technical field of electromagnetic valves. Comprising a valve body provided with an air inlet, a working port, an exhaust port and a pilot cavity; the piston assembly and the valve rod assembly are movably arranged in the valve body and are in mutual linkage, and movement of the piston assembly drives the valve rod assembly to act synchronously so as to control connection and disconnection between the air inlet and the working port and connection and disconnection between the working port and the exhaust port in a linkage mode; the air inlet pilot valve and the exhaust pilot valve are connected with the valve body and are respectively communicated with the pilot cavity; the controller is integrated on the valve body and comprises a pressure sensor and a main control circuit board, and the pressure sensor detects a pressure signal of the working port in real time; and the main control circuit board is electrically connected with the air inlet pilot valve and the exhaust pilot valve respectively. The main control circuit board synchronously controls opening and closing of the air inlet pilot valve and the exhaust pilot valve based on a pressure signal transmitted by the pressure sensor so as to regulate and control the air pressure of the pilot cavity and drive the piston assembly to move, and the pressure of the working opening is kept stable.

Description

Technical Field

[0001] This utility model belongs to the field of electromagnetic valve technology, specifically relating to an electrically controlled pilot-operated pressure regulating valve. Background Technology

[0002] In the current field of pressure regulation technology, traditional pressure regulating valves mostly rely on manual control mechanisms, which brings several significant limitations:

[0003] 1. Manual control is difficult to achieve high-precision pressure regulation, has a slow response speed, and exhibits lag in compensation response when facing pressure changes.

[0004] 2. Because manual intervention is required for setting and adjustment, the installation cost is relatively high, and the entire pressure system lacks an effective signal feedback mechanism, which limits its level of automation and intelligence.

[0005] 3. The electronically controlled pressure regulating valve is unstable, has a relatively simple control mode, and a single installation method, making it difficult to meet the high standards required by special industries such as lithium batteries and semiconductors. Utility Model Content

[0006] This invention addresses the aforementioned problems in the existing technology by proposing an electrically controlled pilot-operated pressure regulating valve capable of achieving high-precision pressure regulation, rapid response, and real-time pressure signal feedback.

[0007] This utility model can be achieved through the following technical solutions:

[0008] An electrically controlled pilot-operated pressure regulating valve, comprising:

[0009] The valve body is equipped with an air inlet, a working port, an exhaust port, and a pilot chamber;

[0010] The piston assembly and the valve stem assembly are movably disposed in the valve body and are linked to each other. The movement of the piston assembly drives the valve stem assembly to move synchronously, so as to control the opening and closing between the air inlet and the working port, and the opening and closing between the working port and the exhaust port.

[0011] An intake pilot valve and an exhaust pilot valve are both connected to the valve body and respectively communicate with the pilot chamber;

[0012] The controller, integrated into the valve body, includes a pressure sensor and a main control circuit board, wherein...

[0013] The pressure sensor detects the pressure signal at the working port in real time.

[0014] The main control circuit board is electrically connected to the intake pilot valve and the exhaust pilot valve respectively. Based on the pressure signal, it synchronously controls the opening and closing of the intake pilot valve and the exhaust pilot valve to regulate the air pressure in the pilot chamber and drive the piston assembly to move, thereby maintaining the pressure stability of the working port.

[0015] As a further improvement of this utility model, a valve plate is provided on the top of the valve body, and the controller, the intake pilot valve, and the exhaust pilot valve are all mounted on the valve plate. A diaphragm is provided between the valve body and the valve plate, and the pilot cavity is formed between the diaphragm and the valve plate.

[0016] The intake pilot valve and the exhaust pilot valve are connected to the pilot chamber through an air guide channel opened on the valve plate.

[0017] As a further improvement of this utility model, the valve body has an upper valve chamber and a lower valve chamber, the piston assembly is located in the upper valve chamber and close to the diaphragm, and the valve stem assembly is located in the lower valve chamber.

[0018] As a further improvement of this utility model, the piston assembly includes a piston and a piston spring, wherein the piston spring provides elastic force to the piston in the direction of the diaphragm.

[0019] As a further improvement of this utility model, the valve stem assembly includes a valve stem sleeve, a valve stem body, and a valve stem spring, wherein the valve stem spring provides elastic force to the valve stem sleeve in the direction of the piston assembly;

[0020] The valve stem body passes through the valve stem sleeve and the two are sealed together. The upper end of the valve stem body extends into the upper valve cavity and is close to the piston.

[0021] As a further improvement of this utility model, the exhaust port is opened on the piston, and the end face of the piston facing the valve stem is provided with a piston seal.

[0022] When the valve stem body contacts the piston seal, the working port and the exhaust port are disconnected;

[0023] When the valve stem body is separated from the piston seal, the working port is connected to the exhaust port.

[0024] As a further improvement of this utility model, the end face of the valve stem sleeve facing the piston is provided with a valve stem seal, which seals the valve port connecting the air inlet and the working port.

[0025] As a further improvement of this utility model, in the initial state, the air inlet and the working port are disconnected, while the working port and the exhaust port remain connected.

[0026] When air enters the pilot chamber, it pushes the diaphragm to deform. The diaphragm pushes the piston to move downward. After the piston abuts against the valve stem body, it pushes the valve stem sleeve to move downward. At this time, the air inlet and the working port are connected, while the working port and the exhaust port are disconnected.

[0027] As a further improvement of this utility model, the controller is also provided with a drive circuit board, which is used to supply power to the pilot intake valve and the pilot exhaust valve.

[0028] As a further improvement of this utility model, a display circuit board is provided on the outer surface of the controller and serves as a human-machine interface, through which the output air pressure value of the working port is set.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. Real-time monitoring and automatic adjustment: Through the pressure sensor integrated into the drive circuit board, the pressure change at the working port can be monitored in real time. This real-time monitoring capability is not available in manual control systems, and it provides a precise data basis for subsequent regulation.

[0031] 2. Data-driven intelligent control: The main control circuit board automatically controls the opening and closing of the intake pilot valve and the exhaust pilot valve based on the pressure data detected by the pressure sensor. This method eliminates the need for manual intervention, improves the automation level of the system, and can more accurately maintain the preset working port pressure value.

[0032] 3. Highly efficient pressure compensation mechanism: By adjusting the pressure in the pilot chamber, the displacement of the piston assembly and valve stem assembly is controlled accordingly, thereby realizing the opening and closing between the intake port and the working port, and between the working port and the exhaust port. This mechanism enables the system to respond quickly to any pressure change, greatly shortening the response time and reducing the hysteresis of the compensation response.

[0033] 4. Piston-type ventilation structure: The piston-type ventilation structure makes the overall structure simpler, the cost lower, and the performance more stable. It reduces the size of the valve body, increases the installation methods, and can meet the high standard requirements of special industries such as lithium batteries and semiconductors.

[0034] 5. Enhance the system's automation and intelligence: The entire process requires no manual intervention and is completed entirely by built-in sensors and the main control circuit board. This not only reduces installation costs but also greatly enhances the system's automation and intelligence, making it more suitable for the high standards required in modern industrial applications. Attached Figure Description

[0035] Figure 1 This is a cross-sectional view of the electrically controlled pilot-operated pressure regulating valve of this utility model;

[0036] Figure 2 This is a schematic diagram of the internal structure of the controller of the electrically controlled pilot-operated pressure regulating valve of this utility model.

[0037] In the diagram, 100 is the valve body; 101 is the air inlet; 102 is the working port; 103 is the exhaust port; 104 is the pilot chamber; 110 is the air inlet pilot valve; 120 is the exhaust pilot valve; 130 is the valve plate; and 140 is the diaphragm.

[0038] 200. Piston assembly; 210. Piston; 211. Piston seal; 220. Piston spring;

[0039] 300. Valve stem assembly; 310. Valve stem sleeve; 311. Valve stem seal; 320. Valve stem body; 330. Valve stem spring;

[0040] 400. Controller; 410. Pressure sensor; 420. Main control circuit board; 430. Drive circuit board; 440. Display circuit board. Detailed Implementation

[0041] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. The technical methods of the present invention will be further described, but the present invention is not limited to these embodiments.

[0042] like Figures 1-2 As shown, this utility model provides an electrically controlled pilot-operated pressure regulating valve, comprising:

[0043] The valve body 100 is provided with an air inlet 101, a working port 102, an exhaust port 103 and a pilot chamber 104. The design of these openings ensures that the fluid can switch between different states according to control requirements.

[0044] The piston assembly 200 and the valve stem assembly 300 are movably disposed within the valve body 100 and achieve synchronous action through mechanical linkage. The movement of the piston assembly 200 directly drives the valve stem assembly 300 to perform corresponding actions, thereby precisely controlling the opening and closing between the air inlet 101 and the working port 102, and between the working port 102 and the exhaust port 103.

[0045] The intake pilot valve 110 and the exhaust pilot valve 120 are respectively connected to the valve plate 130 on the top of the valve body 100 and are each connected to the pilot chamber 104. Their function is to adjust the air pressure in the pilot chamber 104 according to the control signal, thereby indirectly controlling the action of the piston assembly 200 and the valve stem assembly 300.

[0046] The controller 400, integrated into the valve plate 130, includes a pressure sensor 410 and a main control circuit board 420, wherein...

[0047] Pressure sensor 410 monitors the pressure change at working port 102 in real time, providing the system with an accurate pressure feedback signal;

[0048] The main control circuit board 420 is electrically connected to the intake pilot valve 110 and the exhaust pilot valve 120 respectively. Based on the data provided by the pressure sensor 410, it intelligently controls the opening and closing of the two pilot valves to maintain or adjust the air pressure in the pilot chamber 104, and finally realizes the displacement control of the piston assembly 200 and the valve stem assembly 300 to maintain the stability of the pressure in the working port 102.

[0049] It should be noted that in the existing technology, manual control is difficult to achieve high-precision pressure regulation, has a slow response speed, and exhibits lag in compensation response when facing pressure changes. Furthermore, due to the need for manual intervention for setting and adjustment, the installation cost is relatively high, and the entire pressure system lacks an effective signal feedback mechanism, which limits its level of automation and intelligence.

[0050] In contrast, in this embodiment, the pressure sensor 410 monitors the pressure change of the working port 102 in real time. Based on the pressure data detected by the pressure sensor 410, the main control circuit board 420 automatically controls the opening and closing of the intake pilot valve 110 and the exhaust pilot valve 120, thereby adjusting the pressure in the pilot chamber 104. Correspondingly, the piston assembly 200 and the valve stem assembly are displaced to realize the connection and disconnection between the intake port 101 and the working port 102, and between the working port 102 and the exhaust port 103, and finally maintain the pressure of the working port 102 at a preset value.

[0051] The electrically controlled pilot-operated pressure regulating valve provided in this embodiment has at least the following advantages:

[0052] 1. Real-time monitoring and automatic adjustment: The pressure sensor 410 installed in the controller 400 can monitor the pressure changes of the working port 102 in real time. This real-time monitoring capability is not available in manual control systems, and it provides a precise data basis for subsequent regulation.

[0053] 2. Data-driven intelligent control: The main control circuit board 420 automatically controls the opening and closing of the intake pilot valve 110 and the exhaust pilot valve 120 based on the pressure data detected by the pressure sensor 410. This method eliminates the need for manual intervention, improves the automation level of the system, and can more accurately maintain the preset working port 102 pressure value;

[0054] 3. High-efficiency pressure compensation mechanism: By adjusting the pressure in the pilot chamber 104, the displacement of the piston assembly 200 and the valve stem assembly 300 is controlled accordingly, thereby realizing the opening and closing between the intake port 101 and the working port 102, and between the working port 102 and the exhaust port 103. This mechanism enables the system to respond quickly to any pressure change, greatly shortening the response time and reducing the hysteresis of the compensation response.

[0055] 4. Enhance the automation and intelligence of the system: The entire process requires no manual intervention and is completed entirely by the built-in sensors and the 420 main control circuit board. This not only reduces installation costs but also greatly enhances the automation and intelligence of the system, making it more suitable for the high standards required in modern industrial applications.

[0056] It is also worth mentioning that, compared with the commonly used diaphragm 140 component type or double diaphragm 140 type ventilation structure on the market, this embodiment adopts a piston type ventilation structure, that is, by changing the pressure of the pilot gas, the piston assembly 200 is driven to move and the valve stem assembly 300 is driven to move, so as to realize the opening and closing between the air inlet 101 and the working port 102, and between the working port 102 and the exhaust port 103.

[0057] This piston-type ventilation structure is simpler in overall structure, lower in cost, and more stable in performance. By setting this structure, the volume of the valve body 100 is reduced, the installation methods are increased, and it can meet the high standard requirements of special industries such as lithium batteries and semiconductors.

[0058] Preferably, the controller 400, the intake pilot valve 110, and the exhaust pilot valve 120 are all mounted on the valve plate 130. A diaphragm 140 is provided between the valve body 100 and the valve plate 130. This diaphragm 140 not only plays a sealing role, but also forms a closed space with the valve plate 130 together—that is, the pilot chamber 104.

[0059] The intake pilot valve 110 and the exhaust pilot valve 120 are connected to the pilot chamber 104 through the air guide channels opened on the valve plate 130. The design of these air guide channels ensures that the gas can enter and exit the pilot chamber 104 efficiently and accurately, thereby achieving precise control of the pressure inside the pilot chamber 104.

[0060] Since the diaphragm 140 is the core component that drives the piston-type ventilation structure, it is constantly subjected to high-frequency vibration. Therefore, it is specially made of fabric-reinforced rubber, which greatly improves the yield strength, tensile strength and service life of the diaphragm 140.

[0061] Preferably, the valve body 100 has an upper valve chamber and a lower valve chamber, the piston assembly 200 is located in the upper valve chamber and close to the diaphragm 140, and the valve stem assembly 300 is located in the lower valve chamber, wherein...

[0062] The piston assembly 200 includes a piston 210 and a piston spring 220. The piston spring 220 provides the piston 210 with a spring force in the direction of the diaphragm 140, so that the piston 210 is always in a preset position close to the diaphragm 140 in the initial state without external control signals. When gas enters the pilot chamber 104, the diaphragm 140 is deformed by pressure and pushes the piston 210 downward.

[0063] The valve stem assembly 300 includes a valve stem sleeve 310, a valve stem body 320, and a valve stem spring 330. The valve stem spring 330 provides elastic force to the valve stem sleeve 310 in the direction of the piston assembly 200. The upper end of the valve stem body 320 extends into the upper valve chamber and is close to the piston 210. As the piston 210 moves, the piston 210 abuts against the valve stem body 320 and pushes the valve stem body 320 and the valve stem sleeve 310 to move synchronously, thereby realizing the connection between the air inlet 101 and the working port 102, and the disconnection between the working port 102 and the exhaust port 103.

[0064] In addition, the valve stem body 320 passes through the valve stem sleeve 310 and the two are sealed together, which prevents gas leakage during transmission and ensures the efficient operation and safety of the system.

[0065] Preferably, the exhaust port 103 is located on the piston 210, and the end face of the piston 210 facing the valve stem is provided with a piston seal 211, wherein...

[0066] When the valve stem body 320 contacts the piston seal 211, the working port 102 and the exhaust port 103 are disconnected.

[0067] When the valve stem body 320 is separated from the piston seal 211, the working port 102 is connected to the exhaust port 103;

[0068] Preferably, the end face of the valve stem sleeve 310 facing the piston 210 is provided with a valve stem seal 311, which seals the valve port connecting the air inlet 101 and the working port 102.

[0069] By setting the piston seal 211 and the valve stem seal 311, an end face sealing structure is formed between the valve stem body 320 and the piston 210, and between the valve stem sleeve 310 and the valve port connecting the air inlet 101 and the working port 102. This makes the sealing more stable and reliable, and the requirements for the cleanliness of the compressed air are not high.

[0070] The entire sealing structure, consisting of piston assembly 200 and valve stem assembly 300, forms a series linkage. In the initial state, the air inlet 101 is disconnected from the working port 102, and the working port 102 and the exhaust port 103 remain open. Compressed air in the system is discharged from the working port 102 to the exhaust port 103. Once the air inlet pilot valve 110 is energized, air enters the pilot chamber 104, pushing the piston 210 and valve stem downward, so that the air inlet 101 is connected to the working port 102. At the same time, the working port 102 is sealed off from the exhaust port 103, and the air inlet 101 continues to supply air to the working port 102.

[0071] Preferably, the controller 400 also includes a drive circuit board 430 and a display circuit board 440. That is, the circuit board in this embodiment is a three-board structure: a drive circuit board 430, a main control circuit board 420, and a display circuit board 440. The pressure sensor 410 is integrated into the drive circuit board 430.

[0072] The drive circuit board 430 is specifically responsible for supplying power to the pilot intake valve and the pilot exhaust valve, ensuring that these two key components can accurately execute opening and closing actions according to the instructions issued by the main control circuit board 420.

[0073] The main control circuit board 420 provides a control system with diversified control methods, which can realize different control methods such as current, voltage, RS485 and IO-link;

[0074] The display circuit board 440 serves as a system status display and also as a human-machine interface. Through this interface, users can directly operate the system to set the output air pressure value of the working port 102 and adjust other parameters.

[0075] To better illustrate this, the following is the entire control process of the electro-proportional valve:

[0076] 1. Control pressure detection and signal processing

[0077] (1) Pressure detection: The pressure of the working port 102 is transmitted to the pressure sensor 410 chip on the drive circuit board 430 through the air passages on the valve body 100, diaphragm 140 and valve plate 130.

[0078] (2) Signal conversion and processing: The pressure sensor 410 converts the sensed air pressure fluctuations into voltage changes. This voltage signal is amplified proportionally and filtered by a second-order active filter on the circuit board to reduce noise interference. The pre-processed signal is sent to the main chip of the main control circuit board 420 for further algorithm calculation.

[0079] 2. Calculation and decision-making of the main control circuit board 420

[0080] (1) Target pressure comparison: The main chip receives the actual pressure value from the pressure sensor 410 and compares it with the target pressure set by the user in real time through the electrical signal interface;

[0081] (2) Error calculation and PID adjustment: The pressure value detected by the pressure sensor 410 is compared with the target pressure set by the user. Based on the difference between the two (i.e. control error), the required adjustment amount is calculated by the PID algorithm. Based on this result, the system will adjust the PWM duty cycle of the two pilot switching valves in real time.

[0082] 3. Pilot-operated switching valve control

[0083] (1) PWM duty cycle adjustment: When it is necessary to increase or decrease the inflation rate of the pilot chamber 104, the system will increase or decrease the PWM duty cycle of the intake pilot switch valve accordingly; similarly, when it is necessary to change the exhaust rate of the pilot chamber 104, the PWM duty cycle of the exhaust pilot switch valve will also be adjusted.

[0084] (2) Pressure regulation of pilot chamber 104: By precisely controlling the opening and closing time (i.e. PWM duty cycle) of the two pilot switching valves, the pressure level in pilot chamber 104 is effectively managed.

[0085] 4. Pressure regulation mechanism

[0086] (1) Pressure boosting operation: When the set working pressure is increased or the controlled cavity starts to work, causing its internal pressure to drop, the pressure sensor 410 senses this change and transmits the information to the control system, causing the pressure in the pilot cavity 104 to rise, pushing the diaphragm 140 to move downward, which in turn drives the piston 210 and the valve stem to move downward, opening the valve between the air inlet 101 and the working port 102, allowing the high-pressure gas in the air inlet 101 to enter the controlled cavity through the working port 102, thereby increasing its internal pressure;

[0087] (2) Pressure reduction operation: When the set working pressure is reduced or the pressure in the controlled cavity increases, the pressure sensor 410 can also detect this change, which will cause the pressure in the pilot cavity 104 to drop. This causes the piston spring 220 and the gas pressure in the controlled cavity to work together to push the piston 210 and diaphragm 140 to move upward, opening the exhaust port 103 of the main valve, allowing the gas in the controlled cavity to be discharged, thereby reducing its internal pressure.

[0088] Through the above-described process of electrical signal detection, data calculation, and pneumatic actuation, the electro-proportional valve can achieve the following real-time control functions:

[0089] 1. Pressure rise control

[0090] Triggering condition: When the gas pressure in the controlled cavity decreases due to external factors, or when the target pressure set by the customer increases.

[0091] Control process:

[0092] (1) The microcontroller receives the actual pressure signal and the feedback pressure signal from the pressure sensor 410;

[0093] (2) The PWM control duty cycle required for the intake pilot valve 110 is calculated using the PID algorithm;

[0094] (3) Adjust the opening degree of the intake pilot valve 110 according to the calculation results, and charge the pilot chamber 104 with air to increase its internal pressure;

[0095] (4) After the pressure in the pilot chamber 104 increases, it pushes the diaphragm 140 and piston 210 downward, causing the air inlet 101 to open.

[0096] (5) High-pressure gas enters the working port 102 (controlled cavity) from the inlet 101, thereby increasing its internal pressure.

[0097] 2. Pressure drop control

[0098] Triggering condition: When the gas pressure in the controlled cavity increases due to external factors, or when the target pressure set by the customer decreases.

[0099] Control process:

[0100] (1) The microcontroller receives the actual pressure signal and the feedback pressure signal from the pressure sensor 410;

[0101] (2) The required PWM control duty cycle for exhaust pilot valve 120 is calculated using the PID algorithm;

[0102] (3) Adjust the opening degree of the exhaust pilot valve 120 according to the calculation results, so that the pilot chamber 104 exhausts to the outside to reduce its internal pressure;

[0103] (4) After the pressure in the pilot chamber 104 decreases, the gas pressure in the controlled chamber and the force of the spring together push the diaphragm 140 and the piston 210 upward, so that the exhaust port 103 opens.

[0104] (5) The gas in the controlled cavity is discharged through the exhaust port 103, thereby reducing its internal pressure.

[0105] 3. System stability and compatibility

[0106] (1) Closed-loop control system: The control algorithm of the main chip works closely with the hardware system to form a real-time closed-loop control system.

[0107] (2) Stable control effect: The system ensures that the gas pressure in the controlled cavity is always stable near the target pressure set by the customer, and can maintain high-precision pressure control even in the face of changes in the external environment or adjustments in operational requirements.

[0108] This design enables the electro-proportional valve to provide efficient and precise pressure regulation under various operating conditions, meeting the needs of different application scenarios. Through precise sensor feedback and intelligent PID algorithm control, it achieves rapid response and accurate regulation to pressure changes, ensuring the reliability and stability of the system.

[0109] The technical means disclosed in this utility model are not limited to those described above, but also include technical solutions composed of any combination of the above technical features. The above are specific embodiments of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

[0110] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0111] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0112] The technical solutions of the various embodiments of this utility model can be combined with each other, but only if they can be implemented by those skilled in the art. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the protection scope claimed by this utility model.

[0113] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. An electrically controlled pilot-operated pressure regulating valve, characterized in that, include: The valve body is equipped with an air inlet, a working port, an exhaust port, and a pilot chamber; The piston assembly and the valve stem assembly are movably disposed in the valve body and are linked to each other. The movement of the piston assembly drives the valve stem assembly to move synchronously, so as to control the opening and closing between the air inlet and the working port, and the opening and closing between the working port and the exhaust port. An intake pilot valve and an exhaust pilot valve are both connected to the valve body and respectively communicate with the pilot chamber; The controller, integrated into the valve body, includes a pressure sensor and a main control circuit board, wherein... The pressure sensor detects the pressure signal at the working port in real time. The main control circuit board is electrically connected to the intake pilot valve and the exhaust pilot valve respectively. Based on the pressure signal, it synchronously controls the opening and closing of the intake pilot valve and the exhaust pilot valve to regulate the air pressure in the pilot chamber and drive the piston assembly to move, thereby maintaining the pressure stability of the working port.

2. The electrically controlled pilot-operated pressure regulating valve according to claim 1, characterized in that, The valve body is provided with a valve plate at the top, and the controller, the intake pilot valve, and the exhaust pilot valve are all mounted on the valve plate. A diaphragm is provided between the valve body and the valve plate, and the pilot cavity is formed between the diaphragm and the valve plate. The intake pilot valve and the exhaust pilot valve are connected to the pilot chamber through an air guide channel opened on the valve plate.

3. The electrically controlled pilot-operated pressure regulating valve according to claim 2, characterized in that, The valve body has an upper valve chamber and a lower valve chamber. The piston assembly is located in the upper valve chamber and close to the diaphragm, and the valve stem assembly is located in the lower valve chamber.

4. The electrically controlled pilot-operated pressure regulating valve according to claim 3, characterized in that, The piston assembly includes a piston and a piston spring, the piston spring providing elastic force to the piston in the direction of the diaphragm.

5. The electrically controlled pilot-operated pressure regulating valve according to claim 4, characterized in that, The valve stem assembly includes a valve stem sleeve, a valve stem body, and a valve stem spring, wherein the valve stem spring provides a spring force to the valve stem sleeve in the direction of the piston assembly; The valve stem body passes through the valve stem sleeve and the two are sealed together. The upper end of the valve stem body extends into the upper valve cavity and is close to the piston.

6. The electrically controlled pilot-operated pressure regulating valve according to claim 5, characterized in that, The exhaust port is located on the piston, and a piston seal is provided on the end face of the piston facing the valve stem. When the valve stem body contacts the piston seal, the working port and the exhaust port are disconnected; When the valve stem body is separated from the piston seal, the working port is connected to the exhaust port.

7. The electrically controlled pilot-operated pressure regulating valve according to claim 5, characterized in that, The valve stem sleeve has a valve stem seal on the end face facing the piston, which seals the valve port connecting the air inlet and the working port.

8. The electrically controlled pilot-operated pressure regulating valve according to claim 5, characterized in that, In the initial state, the air inlet and the working port are disconnected, while the working port and the exhaust port remain connected; When air enters the pilot chamber, it pushes the diaphragm to deform. The diaphragm pushes the piston to move downward. After the piston abuts against the valve stem body, it pushes the valve stem sleeve to move downward. At this time, the air inlet and the working port are connected, while the working port and the exhaust port are disconnected.

9. The electrically controlled pilot-operated pressure regulating valve according to claim 1, characterized in that, The controller also includes a drive circuit board, which is used to supply power to the intake pilot valve and the exhaust pilot valve.

10. The electrically controlled pilot-operated pressure regulating valve according to claim 1, characterized in that, The outer surface of the controller is provided with a display circuit board, which serves as a human-machine interface. The output air pressure value of the working port is set through the display circuit board.

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