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Rexroth Actuator Positioners are compact, pneumatically operated devices used for accurate positioning of engine governor control arms, butterfly valves, carburetors and other low-force mechanisms.Emerson Aventics offers three types of positioners: diaphragm with radial motion lever, diaphragm-linear, and cylinder-linear. All three models use the same basic principle of applying a predetermined air pressure (supplied by a Aventics Type “H" Controlair® Valve or Type M PLUS™ proportional pressure control valve) to act on a diaphragm or piston to compress a positioning spring. The actuator lever then assumes a specific position which corresponds to the applied pressure and to the control valve handle position.Our Actuator Positioners feature light-weight, strong, die-cast construction with a minimum of connections. Years of performance in heavy construction vehicles, drill rigs, marine applications, and other types of installations have proven them to be rugged and highly dependable.The AA Type are the most powerful of the diaphragm-lever type positioners, with a force rating of 1125 inch-lb-degrees. The AA Types are made in both Single (AA-1 and BA-1) and Two-Direction (AB-1) models. The AA Type are all easily mounted and take up a moderate amount of space.Output Travel adjustable from 7/8" to 2 1/4"