Relay connected to the collector of the transistor

Relay connected to the collector of the transistor, High Speed Hand Dryers when a current is driven, pull switch, solenoid valve is energized, the circuit is closed, hair dryer blowing wind; when there is no current drive, switch off, the solenoid valve is not energized, the circuit is broken, do not blow a hair dryer wind. At the same time the relay ends of a diode in parallel to achieve protection, added a light emitting diode in the circuit as a display circuit, auto hand dryers which shows whether a hairdryer start