The Fisher 3024C actuator is a compact, spring-opposed pneumatic diaphragm actuator. It incorporates a cast yoke mounting and is suitable for general purpose actuation of globe valves. This actuator will position the valve plug in response to varying controller or valve positioner pneumatic output signals applied to the actuator diaphragm. The 3024C actuator can be assembled as either direct-acting or reverse-acting and provides dependable and on/off or throttling operation of automatic control valves.