http://www.armadilloaerospace.com/n.x/Armadillo/Home/News?news_id=196
For your cabin air system, may I suggest an absolute back pressure regulator instead of a vent, and a calibrated orifice on a low pressure regulator? This would give a continuous flow independent of external pressure- else the air would be stagnant during launch prep after the hatch is closed.
Bottle -> reg (50 psig) -> orifice -> Abs back press -> Overboard
The first reg can be referenced to the cabin pressure; its main purpose is to make the orifice a constant Mdot device. The orifice can blow at the pilot's face to ensure clean air for him, while the inlet to the back pressure regulator is farther away, but still within reach, with a cutoff valve in case of the BPR sticking open. The BPR is set to 15 psia, so that after the hatch is sealed and the air turned on, the cabin pressure will rise slightly, but remain constant even at peak altitude. This slight pressure rise and the orifice flow will verify that the system is operating properly.
The air bottle will flow at a constant rate until exhaustion without supervision from the pilot; to open the hatch after landing he'll need to shut off the air bottle and open an equalizing valve. Be careful not to pull a Soyuz 11...
The Tescom 44-4700 series may be appropriate.
Doug
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