Actuators provide mechanical power to a valve to help open or close the valve. This way a person will not have to walk out to a vessel to open the valve when one needs too. I have been speccing out a lot of Bettis actuators lately which use gas to push against a diagphram to open or close a control valve
Future PE Engineer
Pet project I am working on to help other engineers, not much yet hoping to get it grow as I learn more