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Re: check valve quesion
if you have manual valves, you dont need check valves. check valves are for electric solenoids so that when you lose tank pressure that it keeps backpressure on the solenoid valves. without backpressure, they would equalize pressure between the bag and the tank, and if the tank has zero, so do your bags.
another use for check valves is in line with the compressor outlet where it enters the tank, so tank pressure doesnt load on the compressor piston. usually compressors have them built into the leader hoses, if you have a compressor with a stainless leader hose you probably already have a check valve.
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