There is a smart valve positioner in the pneumatic valve positioner. It is an intelligent process control instrument based on microprocessor technology, using digital technology for data processing, decision generation, and two-way communication. It is a valve positioner that can automatically detect the zero point, full scale, and friction coefficient of the regulating valve, and automatically set the control parameters without manual adjustment.
1. The positioner is mainly composed of an I/P position conversion unit and an intelligent valve control unit. The positioner and actuator form a feedback loop. The input device receives a 4-20mA current signal from the controller. The position feedback signal of the regulating valve is compared with the given signal value as a control variable in the microprocessor. Its deviation sends pulses of different lengths through the output port of the main control board to adjust the speed and action of charging and exhausting, so as to control and drive the action of the regulating valve and determine the position.
2. Today, with the development of computer technology, electronic technology, communication technology, and intelligent predictive diagnosis technology, the requirements for intelligent valve positioners are getting higher and higher. It is required that it must adapt to the public lines of network communication and power supply, and its core pneumatic control components must realize ultra-low energy consumption operation to ensure the safe and reliable operation of the network bus control system.
3. The intelligent valve positioner has the characteristics of high reliability, high control precision, convenient function expansion, and convenient communication. It fully meets the requirements of the development direction of industrial control system networking, integration, and intelligence, and fundamentally overcomes the shortcomings of traditional mechanical valve positioners such as high power consumption, slow response speed, easy heat generation, mechanical wear, and electromagnetic interference. The intelligent valve positioner adopts pneumatic pilot technology to realize the internal air circuit control, that is, the small valve controls the flow of compressed air, and then the compressed air drives the large valve, so as to realize the flow control of the controlled medium. This idea of hierarchical control can be realized by the application of piezoelectric valves.
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