The electropneumatic positioner is designed to control the supply of compressed air to an actuator in such a way as to ensure a correspondence between the magnitude of the electric current at the positioner's input and the angle of deflection of the feedback lever connected to the actuator. The positioner is used for proportional motion control of actuators with linear travel (e.g.
s-shaped and axisymmetric valves) and with quarter-turn shaft motion (e.g. ball valves)
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