core structure
Electrical conversion module
I/P converter: The current signal is linearly converted to the pressure signal (such as analog positioner).
Microprocessor: the core of intelligent locator, integrated algorithm processing, self-diagnosis function.
Pneumatic amplifier module
Pneumatic relay: amplifies the air pressure signal to ensure sufficient thrust to drive large valves.
Feedback mechanism
Mechanical connecting rod: connects the stem with the positioner to transmit the displacement signal.
Non-contact sensors: such as reluctance sensors, reduce mechanical wear.
Man-machine interaction interface
LCD display: display valve opening, fault code, etc.
Operation button: Used for local calibration or parameter setting.
selection points
Signal matching
Input signal type: 4-20mA, 0-10V, Fieldbus protocol.
Output air source pressure: usually 0.14-0.7MPa, need to match the needs of the actuator.
Valve characteristic
Thrust requirements: According to the valve size (such as DN300 or more need high thrust positioner).
Stroke type: straight stroke (such as globe valve) vs Angle stroke (such as ball valve, butterfly valve).
Special needs
Explosion-proof requirements: ATEX or IECEx certification is required for petrochemical industry.
Protection level: IP67 or above for outdoor applications.
Split design: The high temperature valve body needs to be separated from the positioning body.
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