... standard, selection available ) 8,Electromagnetic valve parameter: DC 12V, AC 220V, pressurized valve and un-pressurized valve are ... operation pressure of un-pressurized valve: 0.0Mpa, 10. connected with water tank or low pressure water ... Water loading when tank is lack of water 10,Compulsive water loading 11,Increasing Water pressure during ... ,Memory protection when power is failure solar controller