Valve Actuators Selection Guide: Types, Features, Applications
https://www.globalspec.com/learnmore/flow_transfer_control/valve_actuators_positioners/valve_actuators_general
WEBValve actuators mount on valves and, in response to a signal, move a valve to a desired position using an outside power source. Selecting the correct valve actuator will increase uptime, reduce maintenance costs, and increase plant safety. Most valve actuators come permanently lubricated and will operate best with instrument-quality air.
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