According to the Q and A forums, only 1 120 to 60 psi regulator is allowed between the compressor and your working side of the pneumatic.
Quote:
It is permissible to use multiple Norgren regulators. But under Rule <R98>, and for the purposes of a predictable and reasonable inspection process, all regulators, valves, cylinders, and other elements of the "working system" must be located downstream from the (one) primary regulator. Any additional regulators (Norgren or otherwise) must be located downstream from this one primary regulator.
The answers to the other questions have been clarified to make sure this is understood.
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http://forums.usfirst.org/showthread.php?t=8424