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This Guide is made available for the express use of owners and users of the Dive Lab XLDS systems.
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Document XLDS Guide – Section Four A
Revised September 30, 2019
28
SECTION FOUR A: RDC REPAIR / MAINTENANCE / OVERHAUL
Figure 47
5. Engage the cap nut (7) threads into the body
(1), and lightly turn the stem, until it engages
the slot in the soft seat. Then tighten the
bonnet nut by hand, until it bottoms out.
Figure 48
6. Back out one-two turns counterclockwise on
the stem, then using the torque wrench,
torque the packing nut (7) to 150 inch lbs.
Figure 49
7. Place the knob (8) on the stem, and rotate the
valve shut. Then pull the knob off, leaving the
stem and packing nut visually exposed.
Figure 50
8. Perform a leak test on the valve, using full
system pressure. The simplest test, is to shut
both valves on the HP block, attach HP supply
gas to the valve to be tested, and slowly
pressurize to the maximum HP supply
pressure, 4350 psig for DIN and 3500 psig for
“A” Yokes.
At the same time, spray the valve stem and
packing nut, with soapy water to identify any
packing leaks. Hold test pressure for at least
one minute. If any leakage is found, repair or
replace the valve.
9. Upon successful test, install the knob (8),
spring (9), and retaining nut (10), then
tighten the retaining nut, until the slot is
flush, with the end of the stem.
Relief Valve Cleaning
Inspection and Overhaul
The Relief valve used in all RDC units, purchased
before 2011, is the Circle Seal® 0-400 psig,
adjustable brass body relief. RDC consoles sold
after 2011, use the Hylock SS angle relief. Both
valves are very rugged and dependable, and can
be easily serviced by trained persons. Dive Lab
strongly recommends, only factory trained
technicians service this component. Overhaul is
limited to cleaning and replacing the soft seat. If
any other damage is found, the valve should be
replaced. The following procedure covers
overhaul of the Circle seal valve, followed by the
overhaul procedure for the Hylock SS angle relief.
