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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
23
SECTION FOUR A: RDC REPAIR / MAINTENANCE / OVERHAUL
8. Using a 7/8” wrench, while securely holding
the manifold assembly, remove the other half
of the one-way body, from the manifold, by
rotating it counter-clockwise.
Figure 37
9. Using the tube brush and detergent solution,
carefully clean the interior surfaces. After
cleaning, inspect for corrosion, and soak if
necessary in a 50/50 solution, of vinegar and
water.
10. After cleaning, rinsing, and drying the body,
inspect using a bright light for damage in the
form of pitting or galling. Check the spring
for corrosion. If the valve shows any signs of
damage, replace the entire valve.
11. Lightly lubricate the new O-ring (5), and
install in the regulator side of the body, use
the poppet as a tool, to position the O-ring
into place, then load the poppet/spring
housing (2), and spring into place, and
carefully re-connect, the two valve body
halves. If the entire valve assembly had been
removed, reassemble, then re-tape each end
and thread into the manifold first but only
lightly tighten, then install the regulator body
hand tight.
12. Install the PVC pipe over the regulator, and
using the 7/8” inch wrench, loosen the two
valve halves. Tighten the regulator side
of the valve until almost tight, then tighten
the valve halves to check for alignment.
13. After checking alignment, alternate the
tightening of the valve body halves, until the
regulator is upright and level, and the joints
are tight.
14. After all manifold repairs have been made,
load the manifold assembly back onto the
foundation plate, replace all rubber strips
and securing blocks, then tighten all nylon
nuts to 30 inch lbs.
15. Reinstall the pneumofathometer hoses, and
tighten, using good engineering practice.
16. Perform a leak check, by pressurizing the low
pressure system, to at least 350 psig, and
then secure and bleed down the high
pressure supply system. The low pressure
circuit should lose 10-20 psig, as the one way
valve shuts, and then should hold pressure
with no leakage, hold for at least 5 minutes.
Pneumofathometer Valve
Lubrication
Preliminary
There are two types of Pnemofathometer valves,
that have been used on the XLDS. On units made
prior to 2010, a brass Hylock® angle valve, with a
metal to metal seat was used. On units made
after 2011, a stainless steel Hylock valve was
used, which employs a soft seat stem. These
valves will operate for many years, and require
lubrication only once a year. If repair is needed
the repair is limited to replacement of the
packing, and stem only. The valve can be sent to
Dive Lab, for a complete overhaul, if necessary.
