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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
25
SECTION FOUR A: RDC REPAIR / MAINTENANCE / OVERHAUL
4. Remove the spacer (5), plastic packing (4),
and washer (3), then wipe the stem clean,
and inspect for damage in the form of
scratches, corrosion and damaged threads.
Replace the entire valve stem, if the stem is
damaged. Look down into the valve body (1),
for signs of damage. If the valve stem seating
area shows any damage, the entire valve
assembly should be replaced.
Reassembly
5. Lightly lubricate the stem shaft and threads,
then install the washer (3), the plastic
packing (4), then the spacer (5).
6. Thread stem (2) in by hand lightly, until it
bottoms out, then engage the bonnet
packing nut (6), and hand tighten only at this
time.
7. Back the stem out one to two turns, then
torque the packing nut with the 9/16”
adapter to 50 inch lbs., to set the packing,
then loosen and re-torque to 25 inch lbs.
8. The valve should be tested after any work is
done. Ensure the valve is shut, then load the
regulator to 350 psig, and check the
discharge end at the female QD fitting for
leaks by placing the open end of the QD, in a
glass of water for at least one minute, to
check for bubbles.
Removing / Replacing Pnemo Valve
1. Using a 9/16” open-end wrench, remove
the pneumofathometer supply hose, for the
valve being removed.
2. Using the 11/16” open end wrench on the
valve body, remove the valve by turning
counter-clockwise.
New Valve Installation
1. Tape the end of the valve with Teflon tape.
Starting two threads back apply 2 full wraps.
2. Ensure the threads in the manifold are clean
of old Teflon tape, and the threads are not
galled or damaged, then install the pneumo
body, and tighten securely using an open end
11/16 wrench ensuring proper alignment, for
the hose and fitting.
3. Re-Install the hose and tighten, using a 9/16
open end wrench. Torque the hose fitting to
50-inch /lbs.
4. Check the valve for seat tightness and leaks,
by first closing the valve, then slowly load the
regulator to 350 psig.
5. Place the open end of the QD fitting in a glass
of water, to check for seat leaks, for at least
one minute.
High Pressure Supply Valve
Overhaul
There are two types of high-pressure supply
valves that have been used on the Dive Lab HP
routing blocks. All systems made before January
of 2012 used Sherwood® line valves, model
#YVA3010. After 2012, Thermo® line valves
became standard. See Figure 40.
Figure 40 Thermo & Sherwood Line Valves
