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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
26
SECTION FOUR A: RDC REPAIR / MAINTENANCE / OVERHAUL
Disassembly and assembly procedures are the
same for both valves. These valves are normally
used for high-pressure air transfer systems, and
are durable, reliable, and require minimal service.
Overhaul of the valve is limited, to replacing the
sealing washer (20), soft seat (3), stem packing
(5). The valve should be overhauled at least
every five years, and/or whenever damage or
wear is suspected/found, or if the valve does not
operate properly.
Figure 40-1 Sherwood & Thermo Valves Exploded View
Preliminary
1. Ensure the HP supply whips are disconnected
from the cylinders, and the system has been
vented.
2. Open both HP valves, HP-1, HP-2.
3. Ensure the work area is clean, and all tools are
clean.
Tools and Components needed
•
10” or Large Adjustable Wrench Or Vice
•
0-250 inch lb Torque Wrench
•
11/16” Open end Wrench
•
11/16” Crows Foot Adapter
•
1/4 “ Tube Brush
•
10x Magnifying Glass
•
Brass Pick
•
¼-3/8” Flat Blade Screwdriver
•
Christo Lube
•
Soft Good Kit PN#3XL89RK
Disassembly
1. Open the valve being serviced fully,
counterclockwise.
2. Remove the slotted retaining nut (10).
Figure 41
3.
Remove the spring (9).
Figure 42
4. Holding the valve body (1), in a vice or with the
adjustable wrench, loosen the bonnet packing
nut
(7), by turning counter-clockwise, then
remove with the stem (3).
NOTICE
The valve can be disassembled in place, and does
not require removal from the block and hose,
providing the valve body and internal body seat,
does not show signs of contamination, and/or
damage.
