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This Guide is made available for the express use of owners and users of the Dive Lab XLDS systems.
This information is subject to periodic updates and changes. Always check the Dive Lab web site for the latest versions.
Document XLDS Guide – Section Four A
Revised September 30, 2019
33
SECTION FOUR A: RDC REPAIR / MAINTENANCE / OVERHAUL
3. Using the 5/16” Allen socket, reinstall the
stem seat, then torque the stem seat to 150
inch lbs.
4. Install O- ring (6) onto the bonnet (5).
5. Using the 3/32” Allen wrench and the dull O-
ring pick carefully install O-ring 7 into the
Bonnet.
Work the O-ring into the groove, with the
Allen wrench from the bottom of the bonnet,
and with a dull O-ring pick at the groove end.
6. Install the bonnet into the body, and torque
to 150 inch lbs. Using the ¾ inch wrench, and
crows foot with torque wrench.
7. Install stem (8), and disc (4), and spring (3).
8. Then install the lock nut (2) and cap (1)
tighten, the cap approximately 6 turns, by
hand.
9. If the relief valve had been removed from the
manifold, re-tape the pipe threads, reinstall
and tighten using good engineering practice.
Adjusting the Relief
1. Ensure the RDC regulator is backed off
counter-clockwise, and all RDC valves are
shut.
2. Reinstall the HP supply whip to the manifold
and line up a HP air supply of at least 500
psig, to the regulator for the circuit to be
tested, and slowly open an HP air cylinder.
3. Slowly bring pressure to the manifold by
rotating the regulator adjustment knob
clockwise (in), until the LP gauge reads the
desired relief pressure setting.
4. Once the relief is set, retest, by slowly venting
the manifold slightly using the pneumo valve,
until the LP pressure reads 20-30 psig less
than the desired set pressure. Slowly load the
regulator, while watching the gauge to
determine where the relief lifts. For XLDS use
with the ICS and ¼” umbilicals, set the reliefs
to start lifting at a pressure between 390-400
psig. For use with standard 3/8-1/2”
umbilicals, set the reliefs to start relieving at
300 psig.
5. Repeat steps 4 and 5 until the desired setting
is achieved. Once adjusted, hold the spring
cap with the Allen wrench, and tighten
clockwise with the 1” wrench until snug.
Do Not Over Tighten!
NOTICE
This O-ring can be difficult to install take care not to
cut the O-ring.
NOTICE
The relief can be set between 250-410 psig to
accommodate different system configurations. To
adjust, the relief needs to be installed in the RDC, or
attached to a clean adjustable air source. This
procedure uses the installed RDC regulator to set.
NOTICE
If the relief starts venting, slowly rotate the cap (1)
clockwise until the relief stops venting. If the relief
does not vent at the desired set pressure back off
counter-clockwise on the cap until the relief starts
venting at the desired pressure.
NOTICE
The working pressure of the LP system, is well
above the maximum relief setting, obtainable using
this relief. The system will not be damaged by
setting the relief in place. The relief has been sized
to accommodate the maximum flow, of the HP
system.
