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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