For the solenoid(s) on my mach3 system I used (2) oxygen safe 1/4" NPT 110V coil normally closed solenoid valves & (1) 110V solenoid rated for oil/air/water valve for the fuel gas.
You can buy them for 12,24 volt operation as well just be sure at what pressure they will operate. Most usually the lower the voltage the lower operating window the valves will have.
I have noticed several posts on the Zone that others are using wincnc. Someone here has most likely done what you are wanting to do, if it's possible. It may take some time searching
You also might want to contact one of the forum moderators & ask that this thread be moved here http://www.cnczone.com/forums/wincnc/
This thread is for wincnc users in general.
Sorry I can't be of more help.