... valve controller,with the outside or 4~20mA control valve opening current control valve controller,It constitutes together with the ... ordinary electric valve electric system adjustable,Its external input control current by a computer,PLC or automation devices(hereinafter ... Technical details:1,Voltage: 220V /50Hz , 380V/50Hz2,Input control signal 4~20mA,Output impedance ≤200Ω3 ,Output feedback current ...