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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
24
SECTION FOUR A: RDC REPAIR / MAINTENANCE / OVERHAUL
Tools and Components Needed
9/16” Open End Wrench
5/8’’Open End Wrench
Torque Wrench 0-250 inch lbs.
5/8” Crow Foot Adapter for the Torque
Wrench
11/16” Open End Wrench
8-10” Adjustable Wrench
3/32” Allen Wrench
10x Magnifying Glass
Teflon Tape
Packing PN# 1XL6-4RK
Soft Stem PN# __________
Christo Lube
Lint Free Cloth
1. Disconnect all gas supplies. Ensure the system
is vented and the LP gauges read zero.
2. Using the 5/8” wrench, loosen and remove
the bonnet nut (3), by rotating counter-
clockwise.
Figure 38
3. Unscrew (back out) the valve handle
counter-clockwise, and pull the knob (8), and
stem (4) free.
Figure 39
4. Inspect the seat area in the valve for
damage, corrosion and contamination. If the
valve is free of corrosion and damage, wipe
the threads of the stem (4), clean with a clean
lint free cloth, lightly lubricate the stem
threads, and packing area with Christo Lube®,
and reinstall into the body.
5. Back the stem out one to two turns, then
torque the packing nut (3) to 15-20 inch lbs.
6. Test operate the valve without pressure, then
perform a seat tightness test by installing the
valve back in the system and loading the
regulator to 350 psig, then checking the
discharge end of the pneumofathometer
fitting for leaks, by placing the end of the QD
fitting in a glass of clean fresh water, for at
least one minute, to check for bubbles.
Replacing the Valve Packing / Stem
1. In the unlikely event, the valve packing and or
stem need to be replaced, ensure the system
is depressurized, remove the valve knob (8),
using the 3/32”Allen wrench, remove the
knob set screw (8), and knob (7).
2. Loosen and remove the bonnet nut (6).
3. Remove the stem (2).
NOTICE
The two and three diver RDC units use the same
model valve, and are disassembled and
reassembled in the same manner.
NOTICE
Thread stem (4) in, by hand lightly, until it
bottoms out, then engage the bonnet packing
nut (3), and hand tighten only at this time.
