Electrically and pneumatically actuated ball valves, air or electrical power open / power close, failsafe spring or battery automatic return and modulating / proportional opening and closing ball valves. Control by either compressed air or electrically actuated with control voltages ranging from 12vDC, 24vDC, 110vAC or 230vAC and multi voltage motorised actuators 5 to 6 volt DC, 9 to 24v AC/DC and 85 to 265 volt AC. Ball valve sizes range from 1/2", 3/4", 1", 11/4", 11/2" and 2" with either BSP or NPT thread or are available with flanged ends ranging from DN15 (15mm) all the way through to DN150 (6").
Standard air or electric actuators are power open power close, i.e. require energy to move into a new position and with power or compressed air in reverse to return. Upon air or power failure the actuator will stay in it's current position.
Failsafe actuators will move into the next position when either power or compressed air is applied and will maintain this position until power or compressed air is removed at which point the valve will return to its original position by either a spring or back up power supply.
Modulating or proportional actuators allow a valve to be partially opened according to a signal. i.e. Electric actuated valve signal is typically a 0-10 volt or 4 to 20 mAmp signal to control the exact position of the valve, which can be opened in increments in direct proportion to the voltage or milliamps supplied. An air actuated valve would utalise a small psi signal input.