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What is the function of feedback of Pneumatic Control Valve?

What is the function of feedback of Pneumatic Control Valve?

I. Introduction

In the field of industrial automation control, pneumatic control valve as an important control element, the stability and accuracy of its performance has a vital impact on the operation of the entire system. As a professional manufacturer, we are well aware of the central role of the feedback function of the pneumatic control valve in realizing the precise control of the system. The purpose of this paper is to elaborate the feedback function of the pneumatic control valve, in order to provide reference for technicians in related fields.

Pneumatic control valve is a compressed air as a power source, the cylinder as an actuator, and with the help of electrical valve positioner, converter, solenoid valve, holding valve and other accessories to drive the valve, to achieve the switching or proportional adjustment, receiving industrial automation control system control signals to complete the adjustment of pipeline media flow, pressure, temperature and other process parameters. Pneumatic control valve is characterized by compressed air as the driving force, its structure is simple, sensitive action, rapid response, easy maintenance, low price, in addition to the simple realization of remote control.

The feedback function of the pneumatic control valve is the key to achieve precise control. Specifically, the feedback function mainly includes the following aspects:

  1. Valve position feedback

Pneumatic control valve valve position feedback refers to real-time detection of the valve opening or position through sensors or other devices, and feedback this information to the control system. The control system compares the feedback signal with the set value, and realizes the precise control of the valve position by adjusting the action of the actuator (e.g. cylinder). This feedback function can ensure that the valve is subject to external interference or internal changes in the system can still maintain a stable opening or position, thereby improving the accuracy of control and stability of the system..

  1. Flow feedback

In some applications, pneumatic control valves also need real-time monitoring and feedback of fluid flow. This is usually achieved by installing a flow meter before and after the valve. The flow meter will detect the flow signal is converted into an electrical signal, and transmitted to the control system. The control system compares the flow feedback signal with the set value and controls the flow rate by adjusting the valve opening. This flow feedback function can ensure that the system always stays within the set flow range during actual operation, thus meeting the requirements of the production process.

  1. Pressure feedback

In some systems that require precise pressure control, pneumatic control valves also need to have a pressure feedback function. This is usually achieved by installing a pressure sensor in the system. The pressure sensor monitors the pressure changes in the pipeline in real time, and converts the pressure signal into an electrical signal for transmission to the control system. The control system compares the pressure feedback signal with the setpoint and adjusts the valve opening to control the pressure in the pipeline. This pressure feedback function can ensure that the system always stays within the set pressure range during actual operation, thus ensuring the safety and stability of the system.

  1. Temperature feedback

In some special applications, pneumatic control valves also need to monitor and feedback the fluid temperature in real time. This is usually realized by installing temperature sensors in the system. Temperature sensor real-time monitoring of fluid temperature changes, and the temperature signal is converted into an electrical signal transmitted to the control system. The control system compares the temperature feedback signal with the setpoint and controls the fluid temperature by adjusting the valve opening. This temperature feedback function can ensure that the system always stays within the set temperature range during actual operation, thus meeting the requirements of special processes.

Pneumatic control valve feedback function can be realized in a variety of ways, including the following:

  1. Mechanical feedback

Mechanical feedback is through the mechanical connection of the valve position or status information to the control system. This way is simple and reliable, but the precision is relatively low, suitable for the occasions that do not require high control precision.

  1. Electronic feedback

Electronic feedback is through the sensor will be the position of the valve, flow, pressure, temperature and other parameters into electrical signals, and transmitted to the control system. This way of high precision, fast response speed, but requires additional electronic equipment and wiring costs.

  1. Intelligent feedback

Intelligent feedback is through the built-in intelligent module to realize the valve position, flow, pressure, temperature and other parameters of real-time monitoring and feedback. This way not only has the characteristics of high precision and fast response, but also can realize remote monitoring and fault diagnosis and other functions, improve the intelligent level of the system.

The following are some pneumatic control valve feedback function in the actual application of the case:

  1. Petrochemical industry

In the petrochemical industry, pneumatic control valves are widely used in various processes. By realizing the feedback function of valve position, flow, pressure and temperature parameters, it can ensure that the system always stays within the set process parameters during actual operation, thus improving product quality and production efficiency.

  1. Power industry

In the power industry, pneumatic control valves are used to control the flow and pressure of boiler feed water, steam and flue gas and other media. By realizing the feedback function of flow and pressure parameters, it can ensure the safe and stable operation of the boiler and improve the thermal efficiency and economy of the system.

  1. Pharmaceutical industry

In the pharmaceutical industry, pneumatic control valves are used to control the flow and temperature parameters of various chemical raw materials and medicinal liquids. By realizing the feedback function of flow and temperature and other parameters, it can ensure the stability of chemical reaction speed and product quality in the pharmaceutical process, thus improving the production efficiency and product quality of the pharmaceutical industry.

Ⅵ. The conclusion

The feedback function of the pneumatic control valve is the key to realize the precise control of the system. By realizing the feedback function of the valve position, flow, pressure and temperature parameters, it can ensure that the system always stays within the range of the set process parameters during actual operation, thus improving the control accuracy, stability and safety of the system. With the continuous development of industrial automation technology, the feedback function of pneumatic control valve will be more and more important. As a professional manufacturer, we will continue to devote ourselves to the research and development.

 

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