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How does an electro-pneumatic positioner work?

Positioners that maintain and control valve set points can provide excellent performance. These devices locate valve actuators with high accuracy, monitor and record data, and deliver powerful diagnostic and other functions.
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    The factory’s pursuit of optimal efficiency and productivity has led to increased attention to preventive maintenance, which requires maintenance planning and more proactive asset management.

    Industrial Process Loop Control Valves
    Industrial Process Loop Control Valves

    Such efforts should, of course, extend to the pneumatic globe type control valve, one of the most common control elements in the industrial process loop. After all, they play a crucial role in most operations. Control valves’ poor performance can cause significant losses due to downtime, production losses, inefficiency, and unsafe events.

    Positioners that maintain and control valve set points can provide excellent performance. These devices locate valve actuators with high accuracy, monitor and record data, and deliver powerful diagnostic and other functions. Equipment with integrated digital communication enables plant operators to have greater visibility and control of production assets, thus improving plant performance and operational efficiency.

    So how does the electro-pneumatic digital positioner work? Please refer to below function diagram.

    How Electro Pneumatic Positioner Works 1 1
    How Electro Pneumatic Positioner Works
    1. Motherboard with microcontroller and input circuit
    2. Control panel with display and pushbuttons
    3. Piezoelectric valve unit, always present
    4. Valve unit, present as an accessory in the double-acting positioner
    5. Iy module for SIPART PS2 controller
    6. Alarm module for 3 alarm outputs and one binary input
    7. SIA module (slot initiator alarm module, fig.) or mechanical
    8. limit switch module
    9. Spring-loaded pneumatic actuator (single-acting)
    10. Springless pneumatic actuator (double-acting)
    Globe Type Control Valve For Sugar Plant (1)
    Globe Type Control Valve

    I am the author of this article, and also the marketing director of THINKTANK, with 15 years of experience in the industrial valve industry. If you have any questions, you can contact me at any time.

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