A 3-way directional control solenoid valve has 3 pipe connections: the cavity port, the body orifice port and the stop port. It has 2 orifices: the body orifice and the stop orifice, one of which is always open. This allows for 2 paths of flow.
When the power is off the plunger is down which seals off the body orifice and opens up the stop orifice allowing flow through the valve from the cavity port and out the stop port.
When the coil is energized the plunger is raised sealing off the stop orifice and opening up the body orifice allowing flow through the valve from the cavity port and out the body orifice port.

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