Murphy LS200N - Manual (Page 12)

Section 15 00-02-0563
01-11-06 - 8 -
Instructions
1. Block off and bleed the instrument gas pressure supply to the LS200NDVO/DVOR.
2. Remove the tubing between the LS200NDVO/DVOR and the scrubber dump valve,
and remove the supply gas tubing (regulator [-R-] if used).
3. Remove the LS200NDVO/DVOR from the vessel (optional).
4. If the LS200NDVO/DVOR was removed from the vessel, mount it in a suitable vise on
a work bench (if possible).
5. Using the proper tools, disconnect the Inlet, Outlet, and Exhaust fittings from the existing
DVO. See Figure 1. You will re-connect these to the new DVO in a later step.
NOTE: The following steps must be done with the DVO in the upright position (on top of the
LS200NDVO).
6. Remove the LS200NDVO/DVOR cover. The use of a strap wrench or a pipe wrench
may be needed.
7. With a 9/16” hex wrench, loosen the hex head bolt on top of the DVO and remove the
existing DVO from the body.
8. Ensure that the adjustable orifice is fully raised up so that the actuator arm is not bent
when inserted into the body. See Figure 2.
9. Insert the new DVO onto the body. The DVO manual valve operator must face away
from the vessel. See Figure 3.
Figure 1 - DVO Figure 2 – Adjustable Orifice