ROTORK -Fail Safe Electric Actuators Round Flap Iron (Head Pressure) Overview- Rotork offers multiple units to close or open at loss of power, they can use internal battery power of have connections for external power. Application- These actuators are common used on critical condition when the application requires a specific fail condition. They are also used to connect to seismic systems to turn off or on a reservoir in the even of an earthquake. Installation- Rotork IQT are 1/4 turn – 90 degree operation under 1400 ft-lbs. CVA are for precision linear operation while CVQ are for 1/4 turn – 90 degree operation. *Ask us about battery back up systems for larger valves and gates.