714-11-16840 WA380 WA470 Wheel Loader Solenoid Valve Solenoid valves work by controlling the flow of liquids or gases in forward, fully closed or fully open modes. They are often used to replace manual valves or for remote control. The function of a solenoid valve includes opening or closing an orifice in the valve body that allows or prevents flow through the valve. The plunger opens or closes the orifice by raising or lowering the energizing coil within the cannula.