The valve positioner can be divided into a pneumatic valve positioner, an electric-gas valve positioner and an intelligent valve positioner according to its structural form and working principle.
The valve positioner can increase the output power of the regulating valve, reduce the transmission hysteresis of the adjustment signal, speed up the movement speed of the valve stem, improve the linearity of the valve, overcome the friction force of the valve stem and eliminate the influence of the unbalanced force, thereby ensuring the adjustment. Correct positioning of the valve.
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