Bailey Controls AP411000 is a Characterizable pneumatic valve positioner rated for a maximum input of 150 psi, designed to regulate the position of a pneumatic valve actuator by translating a control signal into precise valve travel. This device is used in process control to ensure the valve opening tracks the commanded position, enabling accurate flow control in instrumentation and automation systems. The AP411000 is part of Bailey Controls’ AP series and is documented in retailer listings as a 150 psi max positioner. Although referenced in spare-parts inventories and retrofit discussions, the AP411000 has been discontinued by the manufacturer.
