Amico Dome Loaded Manifold Nema-4 NFPA - Manual (Page 27)

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If necessary, the line regulator replacement can be performed while manifold is in service. However, this should only
be done by qualifi ed technicians experienced in servicing medical equipment.
1. Close the two ball valves on inlet and outlet of line regulator to be replaced.
2. Loosen union nuts on two closed isolation valves.
3. Vent pressure from the bank, which was shut off in step 2 by depressing the bleed valve on side of the regulator.
4. Ensure the orientation of fi ttings (direction of gas fl ow) is the same on the replacement regulator. Install fi ttings on
new regulator.
5. Inspect O-ring removed from the ball valve union. If damaged, replace O-ring.
6. Verify the correct orientation of fi ttings on the regulator, some slight adjustment may be required to align with
the ball valves without causing stress to the fi ttings.
7. Hand-tighten the two ball valve union nuts and then with a wrench snug lightly to ensure the fi ttings are secure.
NOTE : do not over tighten unions, as it is an o-ring seal.
8. Open the ball valves and set line regulator’s output pressure as described in Line Regulator Pressure Adjustment
procedure.
Line Regulator Replacement