Overview QT series Modulating type valves are suitable for controlling butterfly valve, ball valve, plug valve, they can make such valves rotate at 90. The company has developed new intelligent actuator; selection function is increased on the basis of switch type actuator, which increased more selection space for users with different demands. Working Environment and Main Technical Parameters --Optional power supply: AC 220 V AC 380 V. --Ambient temperature :-25 C~+70 C.--Protection level: IP 67. --Relative humidity:< 90% ( at 25 C). --Working time: Short time of 10 min. Main Features Selection Function I: LCD display window and local operation function. Selection Function II: Self phase-identifying and phase disconnection protection. Selection Function III: IR setting and control. Selection Function IV: Automatic regulation function.