Automatic compressed Air Drain

[FabLab]

Here is an automatic air drain circuit that I came up with.
I used 12 volt electric solenoid air valves in place of drain petcocks on both my compressor and all of the drip legs in my shop (wherever I have an outlet I put a drip leg)
You just need to install the drain valves and connect them in parallel to the output.
this will open the valves approx. every hour for approx 5 sec to drain any moisture in the system.
You will need a 12 volt power supply that can supply enough current to operate the amount of valves you have, the valves I found draw 500 mA each. a 5 amp power supply would easily handle 8 valves & power the circuit.
Its a single sided board if you want t etch your own or I can supply the Gerber files if anyone is interested

Air Valve link:
Solenoid valve

Schematic:

Air Compressor Drain Timer Circuit.png

PCB:
Top:

AirCompressorDrainPCBTop.png

Bottom:

AirCompressorDrainPCBBottom.png

[DieselFumes]

Now thats an awesome project. Well done!