Generally its a practice to have your propane pressure about 1/2 the pressure of your oxygen... If you are running a concentrator, your oxygen pressure will be about 7-8psi so your propane pressure should be about 4psi...
These are not hard and fast rules just a pretty common starting point. You may find a combination of slight different pressures will work better for you.
You can probably go all the way down to about 1/2 psi on propane and torch will still function reasonably well.
The pressure ratio is also applicable to tanked oxygen if that is what you are using.
Dale
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