A solenoid valve is an electrically actuated on/off valve. The come in two way, three way, and other configurations. The solenoid part of the valve is always in one of two possible states - it's either energized or deenergized. There is a single moving part inside the solenoid, a (typically) iron rod that is influenced by the magnetic field which develops when the solenoid's coil is energized. Thus energizing causes a change of position of the rod which causes a change of position of the valve. These valves are not capable of modulating action. Because they cannot modulate, I would not refer to a solenoid valve as a "control valve". You could have an on-off valve that was not a solenoid valve, so no, not every on-off valve is a solenoid. Unlike a motor operated valve, a solenoid will have a fail position, and when it is not energized, it will be in the fail position. Also, solenoid valves are small and cheap (relatively speaking).

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