Automatic Shut-off Valves is a traditional switch for water level control. When the pressure of Outlet water is 30~40 PSI, the Automatic Shut-off Valves will block Inlet water. When it’s lower than 20 PSI, the High Pressure Switches will start Pump to create water.

Automatic Shut-off Valves is not suggested when your tap water is too strong. The failure rate of Automatic Shut-off Valves is too high, because each family’s water pressure is different. Nowadays, most of R.O. System uses Solenoid Valve except Automatic Shut-off Valves because it’s more stable.