How to Select an Actuator from SVF Flow Controls
Distinct Purposes of Actuators:
MOVE the ball to the desired position
HOLD the ball in the desired position
SEAT the ball with sufficient torque to provide the desired shutoff specification
PROVIDE a failure mode in the event of system failure
Selection of an actuator type (Pneumatic or Electric) is determined by:
Power source availability
Torque at the valve stem
Failure mode
Control accessories
Speed of operation
Frequency of operation
Plant environment
Size of valve
System component costs
System maintenance