As a key control component in industrial automation, electric regulating valves’ dynamic characteristics and control accuracy directly affect the operating efficiency and stability of the system. This article conducts in-depth research on the dynamic characteristics of the electric control valve, analyzes its performance under different working conditions, and proposes an optimized control strategy and structural improvement plan to improve the response speed, control accuracy and stability of the control valve. These research results will provide a strong theoretical basis and technical support for the research and development and manufacturing of control valve products of CHNLGVF丨中國大乾閥門.

Keywords: electric control valve; dynamic characteristics; control strategy; response speed; stability

Electric control valves are widely used in petroleum, chemical industry, electric power and other industrial fields. As the actuator in automatic control systems, the performance of the control valve is directly related to the precise control of the process flow and the safe and stable operation of the system. In recent years, with the increase in the complexity of industrial production, the requirements for electric control valves in terms of high precision, high response speed and anti-interference ability are increasing. Based on the actual needs of CHNLGVF丨中國大乾閥門丨China's large foreign trade, this article discusses the dynamic characteristics and control methods of electric control valves, aiming to provide technology improvement strategies for high-quality R&D and manufacturing of control valves.

The electric regulating valve receives signals from the control system through the electric actuator and drives the valve actuator to adjust the flow, pressure or temperature of the medium. Its core components include electric actuators, regulating valve bodies, feedback devices and control systems. The dynamic characteristics of the regulating valve are mainly reflected in the system's response speed to input signals, accuracy and stability under different working conditions.

The dynamic response of the electric control valve includes the entire process from control signal input to valve opening change. In this process, the response speed of the actuator, the inertia of the motor, the resistance of the valve body and the nonlinear characteristics of the system will all affect the dynamic behavior of the regulating valve. Common dynamic features include:

Response time: The time from when the valve receives the command to when it reaches the set position is a key indicator of the performance of the regulating valve.

Overshoot and oscillation: During the valve adjustment process, too fast response may cause overshoot or oscillation, affecting system stability.

Stabilization time: The time required for the system to restore stability. Excessive stabilization time will affect the efficiency of the control system.

Type of actuator: The performance of the electric actuator directly affects the dynamic response of the regulating valve. Common actuators include stepper motors, servo motors, etc. Due to their precise control and high-speed response capabilities, servo motors are widely used in situations that require high dynamic performance.

Valve structural design: The design of the valve body, such as valve core shape, valve seat structure and flow channel design, directly affects the medium flow characteristics and dynamic response performance. Valves with different structures have obvious differences in their dynamic characteristics when handling high-speed or high-pressure media.

Feedback control system: The high-precision feedback control system can adjust the valve opening in real time to ensure the stability and response speed of the system. The control accuracy of electric regulating valves depends largely on the design of feedback control.

In order to study the dynamic characteristics of electric control valves, this paper designed a simulation experimental system that can test the response performance of the valve under different pressure, temperature and flow rate conditions. The test content includes the opening and closing response time, adjustment accuracy and stability of the valve. The electric control valve used in the test was an existing product of CHNLGVF丨中國大乾閥門丨China Dagangyangmao, and the performance of different actuators (stepper motors and servo motors) was compared.

Response time comparison: The response time of the control valve driven by the servo motor is significantly shorter than that of the control valve driven by the stepper motor. Especially under high-frequency switching operations, the servo motor shows superior performance.

Overshoot and oscillation: When the response speed of the actuator is too fast, overshoot and oscillation are prone to occur, especially during the adjustment process of high-pressure media. By adjusting the feedback control parameters, the overshoot phenomenon can be effectively suppressed.

Stability analysis: Under high-pressure and high-speed fluid media, the stability of the regulating valve is significantly affected. Optimizing the control parameters of the valve structure and actuator is an important means to improve stability.

Through testing and analysis, a control optimization strategy for electric regulating valves is proposed:

Closed-loop control strategy: Using a high-precision closed-loop feedback control system to adjust the action of the actuator in real time can effectively reduce the system's response time and improve control accuracy. At the same time, closed-loop control can also suppress overshoot and oscillation of the system and improve dynamic stability.

Adaptive control algorithm: In view of the differences in dynamic characteristics of different working conditions, an adaptive control algorithm is introduced, which can adjust control parameters according to real-time working conditions to ensure the response and control effect of the valve.

In order to further study the dynamic characteristics of electric control valves, this article uses a transient simulation method that combines CFD (computational fluid dynamics) and FEM (finite element analysis) to simulate the dynamic response process of the valve under different flow rates and pressure conditions.

This paper constructs a three-dimensional simulation model of an electric control valve, mainly simulating the fluid dynamics characteristics and structural deformation during the opening process of the valve. The boundary conditions used in the simulation are consistent with the actual test conditions, ensuring the accuracy of the simulation results.

Fluid characteristics: When the fluid passes through the valve, complex flow field changes occur. The flow instability of the high-speed fluid in the early stage of valve opening has a significant impact on the adjustment accuracy.

Structural deformation: The impact of high-pressure fluid may cause slight deformation of the valve's internal structure, which will further affect the dynamic response of the valve. Optimizing the valve body material and structural design can effectively reduce deformation and improve adjustment accuracy.

Through simulation analysis, this article puts forward suggestions for optimizing the valve structure, including improving the valve core design, reducing flow channel resistance, and improving the impact resistance of the material, to further improve the dynamic performance of the regulating valve.

Based on the above research and analysis, this article proposes a technology improvement strategy for CHNLGVF丨中國大乾閥門丨China Dagangyangmao regulating valve products to improve its dynamic response and control accuracy and meet the needs of high-end industrial applications.

High-performance servo motor: The introduction of high-precision servo motor further improves the response speed and control accuracy of the actuator while reducing energy consumption during operation.

Modular design: Design modular actuators according to different working conditions, so that they can be flexibly configured according to actual applications and adapt to a variety of industrial scenarios.

Improve valve core and valve seat design: By optimizing the valve core shape and valve seat structure, the fluid resistance is reduced and the dynamic response speed of the regulating valve is improved.

Improve valve body material performance: Use high-strength, corrosion-resistant materials to enhance the stability and durability of the valve in high-pressure and high-temperature environments.

Intelligent feedback control: Combining the real-time data feedback system with artificial intelligence algorithms to dynamically adjust valve control parameters to improve the valve's response speed and adjustment accuracy.

Adaptive control algorithm: For complex working conditions, an adaptive control algorithm is developed, which can automatically adjust the control strategy according to the actual operating status and achieve precise adjustment for different working conditions.

Based on the research results of this article, CHNLGVF丨中國大乾閥門 will implement the following improvements in the R&D and manufacturing process of control valves:

The integration of the modular design of the actuator and the intelligent control system improves the performance of the control valve in high-precision applications;

Improvement of materials and manufacturing processes, using high-strength, high-temperature and corrosion-resistant materials to enhance product reliability and service life;

Precision control during the manufacturing process improves production efficiency while ensuring product consistency and high quality.

Through in-depth research on the dynamic characteristics and control strategies of electric control valves, this article proposes a number of technology improvement strategies, aiming to improve the dynamic response capabilities and control accuracy of CHNLGVF丨中國大乾閥門丨China Dagangyangmao control valve products. Through closed-loop feedback control, intelligent algorithm optimization, and improvements in valve structural design, the performance of regulating valves in industrial applications has been significantly improved. This research result will provide technical support and market competitiveness for CHNLGVF丨中國大乾閥門's high-quality development in the research and development and manufacturing of regulating valve products.