The feedback detectors are used in many process industries to control product flows. These are controlled using a shaft rotation of 90 ° and thus used for quarter turn valves. The current valve position status is used as feedback to the control system. The feedback detectors are offered for direct mounting onto the actuator for quick connection, easy replacement and extreme compactness. These are provide in standardized housing forms, well protected and equipped with integrated connections for the switch and control valve.