The working principle and selection application of electric angle control valve
The electric angle control valve is one of the important adjustment equipment in the field of industrial automation control, and its working principle and application selection have always been the focus of engineers. This article will introduce the working principle, selection and application of electric angle control valve in detail, aiming to help readers better understand and apply this adjustment equipment.
1. The working principle of the electric angle control valve
The electric angle control valve is composed of two parts: electric actuator and control valve. The electric actuator receives the control signal from the control system, and drives the valve stem to rotate through the motor, thereby driving the valve plate or valve core of the regulating valve to move to realize the control of the flow, pressure, temperature and other parameters of the fluid medium.
The control valve is the core part of the electric angle control valve, and its working principle is mainly based on the principles of fluid mechanics and thermodynamics. According to different control requirements, the valve plate or spool of the control valve will be designed in different structural forms, such as flat plate, cone, parabola, etc. When the disc or spool moves, the flow area of the control valve is changed, thus throttling the fluid. During throttling, the fluid medium is affected by pressure drop and velocity changes, which in turn produces a damping effect, allowing the control valve to effectively control the pressure, flow and temperature parameters in the system.
Second, the selection of electric angle control valve
In industrial automation control systems, the selection of electric angle control valves is very important. Whether the selection is reasonable or not directly affects the performance and stability of the entire control system. The following will introduce the selection points of electric angle control valve from several aspects:
1. Media characteristics: select the appropriate type of control valve according to the characteristics of the process fluid. For example, for fluids that contain particles, are viscous or corrosive, control valves with abrasion and corrosion resistance should be selected.
2. Control requirements: Determine the flow characteristics, flow range, pressure level and other parameters of the control valve according to the process control requirements. The flow characteristics mainly consider the control requirements of the control valve on the fluid medium, such as linear flow characteristics, equal percentage flow characteristics, etc., the flow range needs to be determined according to the actual working conditions, and the pressure level needs to meet the system pressure requirements.
3. Power supply and actuator: select the appropriate power supply voltage and motor power according to the requirements of the control system, as well as the electric actuator with good stability and explosion-proof performance.
4. Environmental conditions: Considering the influence of temperature, humidity, vibration and other factors on the performance of the control valve, select the appropriate protection level and explosion-proof control valve according to the actual situation.
5. Maintenance: On the premise of meeting the control requirements, choose an electric angle control valve that is easy to maintain to reduce operating costs.
3. Application of electric angle control valve
As an important industrial automation control equipment, electric angle control valve is widely used in chemical, petroleum, electric power, pharmaceutical and other fields. The following are typical applications of electric angle control valves in different fields:
1. Chemical production: In the chemical production process, the electric angle control valve is mainly used to accurately control the temperature, pressure, flow and other parameters to ensure the stability and safety of the production process. For example, in chemical production lines such as ammonia synthesis and urea, electric angle control valves can achieve fast and precise control of temperature and pressure during the reaction process.
2. Petroleum refining: In the process of petroleum refining, the electric angle control valve is mainly used to control the temperature, flow and pressure of the oil to ensure the quality and stability of the oil. For example, in atmospheric and vacuum units, precise control of oil temperature through the use of electric angle control valves can improve oil quality and yield.
3. Electric power industry: In the electric power industry, electric angle control valves are mainly used to control various parameters of boilers and steam turbines to ensure the stability and safety of the power generation process. For example, in the boiler feed water system, the precise control of the feed water flow can be achieved by using an electric angle control valve to ensure the normal operation of the boiler and the stability of the water circulation.
4. Pharmaceutical industry: In the pharmaceutical industry, electric angle control valves are mainly used to control the production process and product quality of drugs. For example, in the antibiotic fermentation process, the yield and purity of antibiotics can be increased by using an electric angle control valve to achieve precise control of fermentation temperature and ventilation.
In a word, as an important industrial automation control equipment, the electric angle control valve has a wide range of application prospects. In practical application, reasonable selection and application should be carried out according to specific process requirements and working conditions to improve the performance and stability of the whole control system.