Are you familiar with Ingersoll-Rand? The have a good website that you should be able to access thru ur local rep. A piping chart giving pressure loss per 100 ft based on line pressure, pipe size & cfm. Example: 3/4" SCH 40, 100 cfm, 100 psig has drop of 7.53 psig/100ft.
I don't think it's wise to depend on a check valve as your only means of isolation. A manually operated valve should be included downstream of the check valve.
