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Verify that the flow direction matches the arrow on the valve
Close the upstream and downstream isolation valves
Fully open the pilot-valve adjusting bolt (turning it counter-clockwise)
Open the upstream isolation valve
Verify the upstream pressure is higher than the required set-pressure
Leave the selector valve closed when all the trapped air has vented
Slightly open the downstream isolation-valve
Turn the selector valve to 'Auto'
Slowly tighten the adjustment-bolt of the pilot-valve, while watching the downstream pressure-gauge, until the required set-value is reached.
When the correct pressure is set, tighten the locking nut to prevent accidental change