... 4" 3.Auto Open/Close Time:6~20s GA-311 Valve Controller for Fire Protection 1. Working Voltage:DC8V~16V2. ... Working Current:20mA~200mA3. Valve Specifications:1/2", 3/4"4. Moment:3.5 N ... as Access control System, Access Control Board, Electromagnetic Lock, Electric Bolt Lock, Electric Control Lock, Electric Strike, Time Attendance and Biometrics, etc. Valve Controller ...