Do take note of R87 (emphasis mine):
Quote:
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“Working” air pressure on the ROBOT must be no greater than 60 psi (~413 kPa) and must be provided through a single primary adjustable, relieving, pressure regulator.
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That is, to do what you're proposing, put a primary regulator adjusted to 60psi, and put your lower pressure regulators downstream of the primary. Watch out for minimum pressure required to work piloted solenoid valves!